Transport of a model diffusion probe in polyelectrolyte-surfactant hydrogels
In this study, two types of hydrogels were prepared: 1) based on hyaluronan and cationic surfactant septonex (carbethoxypendecinium bromide) and 2) based on diethylaminoethyl dextran and sodium dodecylsulphate. Nile red as a dye diffusion probe was incorporated into hydrogel in their preparation and then its release into surfactant solution and physiological saline was monitored. The release of NR from hydrogels was characterized by the effective diffusion coefficients of NR and structural parameters of hydrogels. The diffusion of NR in hydrogels was dependent on the molecular weight of polyelectrolyte and the ratio betwee...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 25, 2019 Category: Chemistry Source Type: research

A novel curcumin-loaded PLGA micromagnetic composite system for controlled and pH-responsive drug delivery
Publication date: Available online 22 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Srinivasan Ayyanaar, Mookkandi Palsamy Kesavan, Gandhi Sivaraman, Balaji Maddiboyina, Jamespandi Annaraj, Jegathalaprathaban Rajesh, Gurusamy RajagopalAbstractPoly(D, L-lactide-co-glycolic acid) (PLGA) based magnetic microspheres (MMS) hold immense potential for reaching the target of controlled and specific drug delivery site with low toxicity. Herein, we have synthesized the biodegradable PLGA microspheres (MS) containing magnetic iron oxide nanoparticles (MIONPs) by the emulsion solvent evap...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 23, 2019 Category: Chemistry Source Type: research

Conversion of low molecular weight hydrogel to nitrogen-doped carbon materials and its application as supercapacitor
In this study, we use low molecular weight hydrogel as a precursor, doped with different amount of urea to change nitrogen content. We discovered that the nitrogen-doping may change the morphology of the materials after pyrolysis. We further analyzed the electrochemical properties of the N-doped porous carbon materials. The electrochemical capacitance may increase due to nitrogen-doping, but with high nitrogen content, the capacitance decreased conversely. The increase of electrochemical capacitance may relate to the content of quaternary nitrogen.Graphical abstract (Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects)
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 23, 2019 Category: Chemistry Source Type: research

Self-Assembly of Photosensitive and Chemotherapeutic Drugs for Combined Photodynamic-Chemo Cancer Therapy with Real-Time Tracing Property
Publication date: Available online 22 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Shengtao Wang, Jingtao Li, Zhou Ye, Jieling Li, Anhe Wang, Jing Hu, Shuo Bai, Jian YinAbstractHerein, an amphipathic polymeric photosensitizer, designated as PEGylated distyryl boron dipyrromethenes with real-time tracing property, is synthesized as a kind of multifunctional carrier to load drugs for combined photodynamic-chemo therapy. The hydrophilic PEG side chains on the carriers prolong its blood circulation time and the self-assembly capacity of PEGylated distyryl boron dipyrromethenes ef...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 23, 2019 Category: Chemistry Source Type: research

HKUST-1 MOFs decorated 3D copper foam with superhydrophobicity/superoleophilicity for durable oil/water separation
Publication date: Available online 22 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jingcheng Du, Changyuan Zhang, Hong Pu, Yufeng Li, Saimeng Jin, Luxi Tan, Cailong Zhou, Lichun DongAbstractOil/water separation is an urgent topic because the frequently occurred oil leakages and increasing discharge of oily wastewater. The 3D metal foams with special wettabilities are promising oil/water separation materials owing to their outstanding properties. Herein, we fabricated a HKUST-1 MOFs decorated copper foam using a facile template-sacrificial method for oil/water separatio...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 23, 2019 Category: Chemistry Source Type: research

Optimized production of antibacterial copper oxide nanoparticles in a microwave-assisted synthesis reaction using response surface methodology
Publication date: Available online 21 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Shishir V. Kumar, Adarsh P. Bafana, Prasad Pawar, Meghana Faltane, Ashiqur Rahman, Si Amar Dahoumane, Ashwini Kucknoor, Clayton S. JeffryesAbstractCopper oxide nanoparticles (CuONPs) can be an inexpensive alternative to silver and gold nanoparticles. However, work toward the sustainable synthesis of colloidal CuONPs is limited. This work establishes a simple microwave-assisted synthesis for colloidally stabilized, antibacterial CuONPs synthesized from glucose, starch and CuCl2. Optimization usi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Simulation of Evolution Mechanism of Dynamic Interface of Aqueous Foam in Narrow Space Base on Level Set Method
Publication date: Available online 21 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Fei Wang, Dongxing Du, Hailong Chen, Chao ZhangAbstractThe properties of foam fluid are substantially determined by its interfacial dynamics changes during foam transport. In this research, a foam flow simulation model based on the level set method and the N-S equation with surface tension term is established to simulate the dynamic interface evolution mechanism of group foam and individual foam from various aspects such as drainage process and foam migration in porous media, coalescence and Ja...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Rheological study on the invert emulsion fluids with organoclay at high aged temperatures
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Tie Geng, Zhengsong Qiu, Chunhua Zhao, Li Zhang, Xin ZhaoAbstractInvert emulsion fluids stabilized by organoclays are important for applications in thixotropic fluids and petrochemical industry, especially in the field of oil extraction. Among these applications, improvement of the rheological properties of invert emulsion fluids at high temperatures lacks detailed study. In the current work, three different organoclays, including organo-sepiolite (OSEP), organo-hectorite (OSHCA) and organo-mon...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Esterification influence in thermosensitive behavior of copolymers PNIPAm-co-PAA and PNVCL-co-PAA in magnetic nanoparticles surface
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): B.E. Amantea, R.D. Piazza, J.R.V Chacon, C.C. Santos, T.P. Costa, C.O. Rocha, J.V. Brandt, D.R.M. Godoi, M. Jafelicci, R.F.C. MarquesAbstractThe ability to generate heat from magnetic nanoparticle and the response of thermosensitive polymers poly(n-isopropylacrylamide) (PNIPAm) and poly(n-vinyl caprolactam) (PNVCL) are properties that have promoted several studies in controlled drug release systems. As the lower critical solution temperatures (LCST) of PNIPAm and PNVCL are between 32-35 ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Mechanisms of how surfactants mitigate formation damage due to aqueous phase trapping in tight gas sandstone formations
In this study, therefore, we have investigated the mechanisms of the trapped aqueous phase removal from the tight gas sandstone formations by considering the effect of surfactants on the wettability alteration, the work of adhesion, and the apparent water film thickness.Theoretical analyses suggest that further the larger the contact angle that the drop of water creates with the reservoir rock surface, the less energy is required for producing gas to displace the water from the reservoir. Therefore, the first part of the study was devoted to determining the optimum surfactant type and concentration, which would yield to th...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Fabrication of a zinc tungstate-based a p-n heterojunction photocatalysts towards refractory pollutants degradation under visible light irradiation
In this study, ZnWO4/BiOBr heterojunction were successfully prepared via a hydrothermal and a simple deposition method. The obtained ZnWO4/BiOBr composite exhibited superior photocatalytic activity towards refractory pollutants tetracycline (TC) degradation. Among, the samples of ZB-2(Zn/Bi molar ratios is 0.2) exhibited the best photocatalytic performance. Based on the LC-MS analysis, a possible degradation pathway of TC is also suggested. The optical and electrical properties of the obtained materials demonstrated that the fast transfer of electron-hole pairs was achieved in ZnWO4/BiOBr hybrid though constructing a p&nda...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

One-step fabrication of thermal resistant, corrosion resistant metal rubber for oil/water separation
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Yu Yang, Zhiying Ren, Siyang Zhao, Zhiguang GuoAbstractMetal rubber (MR) with excellent mechanical properties and porosity is often used as a filter material in mechanical systems. Oil filtration involves not only the recycling of contaminated oil, but more importantly, it ensures normal functioning of the hydraulic system and lubrication system. Here, one-step etching method was employed to fabricate the superhydrophilic and underwater superoleophobic MR. The modified MR could efficiently and ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

How to decrease the agglomeration of magnetite nanoparticles and increase their stability using surface properties
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Sarai E. Favela-Camacho, Enrique J. Samaniego-Benítez, Andrés Godínez-García, Luz Ma. Avilés-Arellano, J. Francisco Pérez-RoblesAbstractThe development of a variety of methodologies has been studied in order to obtain good dispersed nanoparticles in the medium without seriously affecting the magnetic and rheological properties of them. One of the areas of application that needs a material with controlled particle size and good stability is that of biome...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Impeding Polysulfide Shuttling with a Three-Dimensional Conductive Carbon Nanotubes/MXene Framework Modified Separator for Highly Efficient Lithium-Sulfur Batteries
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Nuo Li, Weiyi Cao, Yawen Liu, Hongqi Ye, Kai HanAbstractThe shuttling of polysulfide is still a major issue which greatly hinders the practical application of lithium-sulfur (Li-S) batteries. Here, we report a multifunctional separator for trapping polysulfide and reusing the active sulfur species in Li-S batteries. The multifunctional separator was fabricated by coating the commercial polypropylene (PP) separator with a three-dimensional (3D) interwoven framework structure composed of 1D carbo...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Superhydrophobic and corrosion resistant properties of electrodeposited Ni-TiO2/TMPSi nanocomposite coating
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Mozhgan Salehi, Mahdi Mozammel, Seyed Masoud EmaratiAbstractA superhydrophobic Ni-TiO2/TMPSi nanocomposite coating was fabricated on a copper substrate by a two-step process, including simultaneous electrodeposition of Ni-TiO2, and surface chemical modification of the layer employing trimethoxy(propyl)silane. Surface characterizations was studied by FESEM, FTIR-ATR, AFM analyses. Water-repellency of the substrate significantly increased by fabrication of Ni-TiO2/TMPSi coating on the copper subs...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Calcium ion effects on the water/oil interface in the presence of anionic surfactants
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Enrico Riccardi, Thomas TichelkampAbstractThe influence of ion type at constant ionic strength on the surfactant layer present between a polar and a non-polar liquid has been investigated. The investigated systems are composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT), dodecane and brines with different electrolyte compositions. Parallel and coordinated sampling have been performed via molecular dynamics simulation and experiments. By varying the molar ratio between calcium and sodium io...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Two/three-dimensional interfacial properties of the novel peptide as a selective destroyer of biomembrane
In this study, a novel amphiphilic peptide (amPE) was designed for antimicrobial agent. Its thermal responsiveness in solution and in liposome membrane was studied by circular dichroism (CD). Then, amPE’s adsorption and further insertion behaviors at lipid monolayer were investigated by Langmuir-Blodgett (LB) and polarization modulation infrared reflection adsorption spectroscopy (PM-IRRAS). Results showed that amPE could selectively insert into DPPG monolayer due to the electrostatic interaction and cause an increase in content of α-helix. Adsorption kinetics under different initial surface pressures showed hi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Material properties of cocoa butter emulsions: effect of dispersed phase droplet size and compression speed on mechanical response
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Vincenzo di Bari, Antonio Sullo, Jennifer Norton, Ian NortonAbstractWater-in-cocoa butter (CB) emulsions material properties were investigated using uniaxial compression test. Emulsions containing 20% (wt%) water and with a range of droplet size were manufactured to assess the role of defect size on emulsions mechanical properties. Although differences were not significant within the tested droplet size range, results showed a decreasing trend in the values of mechanical parameters at fracture ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Controlling dispersion, stability and polymer content on PDEGMA-functionalized core-brush silica colloids
Publication date: Available online 20 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): María Jazmín Penelas, Cintia Belén Contreras, Juan Giussi, Alejandro Wolosiuk, Omar Azzaroni, Galo J. A.A. Soler IlliaAbstractCore-brush hybrid nanoparticles containing PEG surface functions are highly interesting as biologically inert and smart stimuli-responsive materials for future applications in biosensors, drug delivery, tissue engineering and optical systems. In this context, surface modification methodologies are critical to exert a thorough control of morphological...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 22, 2019 Category: Chemistry Source Type: research

Impact of local inhomogeneities on the complexation between poly(diallyldimethylammoniumchloride) and sodium dodecyl sulfate
Publication date: Available online 19 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Krisztina Bali, Zsófia Varga, Attila Kardos, Róbert MészárosAbstractThe nonequilibrium behavior of oppositely charged polyelectrolyte(PE)/surfactant(S) mixtures has been the focus of recent investigations due to its industrial relevance. The studies indicated that the initial local inhomogeneities may significantly affect the characteristics of the formed PE/S nanoassemblies. However, this phenomenon is not clearly understood and it has not been investigated systemat...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Thermo-sensitive micelles based on amphiphilic poly(butylene 2-methylsuccinate)-poly(ethylene glycol) multi-block copolyesters as the pesticide carriers
Publication date: Available online 19 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jiarui Han, Yunxuan Weng, Jun Xu, Baohua GuoAbstractA novel bio-based and biodegradable aliphatic multi-block copolyester, poly(butylene 2-methylsuccinate)-poly(ethylene glycol) (PBMS-PEG), is synthesized from 1,4-butanediol (BDO), 2-methylsuccinate acid and polyethylene glycol (PEG) via direct esterification and polycondensation process with tetrabutyl titanate as catalyst. Thermo-sensitive PBMS-PEG micelles are obtained by self-assembly of amphiphilic block copolyesters in aqueous medium by d...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Novel dispersed Tl2O3-SiO2/polyaniline nanocomposites: in-situ polymerization, characterization and enforcement as a corrosion protective layer for carbon-steel in acidic chloride medium
Publication date: Available online 19 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Hany M. Abd El-Lateef, Mai M. KhalafAbstractThe current approach discussed a synthesis and characterization of polyaniline (PANI) and two modified loading of 5, 10 % Tl2O3-SiO2/ PANI, in which Tl2O3-SiO2 nanoparticles (NPs) were modified with PANI forming nanocomposites. The composite formation and structure were confirmed by X-ray diffraction (XRD), UV-visible absorption spectra (UV-vis), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) with energy dispersive ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Effect of phytic acid on the surface properties of scheelite and fluorite for their selective flotation
In this study, the effect of phytic acid (PA) on the surface properties of scheelite and fluorite was systematically investigated. PA was spontaneously adsorbed onto fluorite through electrostatic and chemical adsorption. By contrast, PA did not appear on the scheelite due to the reaction conditions, surface site, and steric hindrance. XPS measurements were utilized together with a solution chemistry analysis to understand better both the PA selective adsorption mechanism and the key factors derived from multi-layer adsorption onto fluorite, which was found to hinder completely that of NaOl.Graphical abstract (Source: Coll...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Luminescent surface-functionalized mesoporous core-shell nanospheres and their cytotoxicity evaluation
Publication date: Available online 19 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Anees A Ansari, Maqsood A Siddiqui, Aslam Khan, N. Ahmad, M. Alam, Ahmed Mohamed El-Toni, Abdulaziz A. Al-KhedairyAbstractSpherical shaped SiO2@Tb(OH)3 nanospheres (core-shell NSs) with an average grain size of 300-350 nm were successfully synthesized at a large scale via sol-gel process with subsequent heat treatment. XRD results demonstrated the non-crystalline nature of the sample even after coating with terbium hydroxide. TEM and SEM images clearly showed that the prepared sample was...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Insights into Morphological Transition of Pluronic P123 Micelles as a Function of Gallate
Publication date: 5 July 2019Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 572Author(s): Haiyan Luo, Kun Jiang, Xiangfeng Liang, Chao Hua, Yingbo Li, Huizhou LiuAbstractPluronics have emerged as a potential agent for solubilizing a variety of lipophilic bioactive molecules, but how these solubilizates affect the morphology of Pluronic micelles still remains poorly understood. In this work, the morphological transition of Pluronic P123 micelles induced by three gallate homologs with different alkyl chain length, namely methyl gallate (MG), propyl gallate (PG) and octyl gallate (OG) has bee...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 20, 2019 Category: Chemistry Source Type: research

Resonance Properties of Quartz Crystal Microbalance Immersed in High Solid Content Suspensions
Publication date: Available online 18 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): J.A. Botha, T.N. Hunter, D. Johannsmann, D. Austin, C.S. Hodges, G.A. Mackay, S.E. Woodbury, S. Biggs, D. HarbottleAbstractThe resonance properties, frequency and half-band-half-width, of a quartz crystal microbalance (QCM) immersed in concentrated suspensions of 16.2 vol% TiO2 are shown to be a function of pH. The overall QCM response is dependent on the complex interactions between the QCM sensor and overlying particle suspension. Atomic force microscopy confirms pH dependent interacti...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Desorption of heavy metals and tetracycline from goethite-coated sands: The role of complexation
This study aims to evaluate the effects of the complexation of heavy metals and TC on their desorption from goethite-coated sands (GCS), using batch experiments and model calculations. Our results show that heavy metals can inhibit the desorption of TC from the GCS surface, and that TC exerts a similar influence on the desorption of heavy metals. The inhibition of copper (Cu) by TC was stronger than that of cadmium (Cd), possibly resulting from TC’s stronger complexation with Cu. In addition, a correlation analysis between the complexation and amount of desorption showed that the inhibition of the desorption on GCS w...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

A functionalization strategy for the dispersion of permanently magnetic barium-hexaferrite nanoplatelets in complex biological media
Publication date: Available online 18 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Tanja Goršak, Darko Makovec, Uroš Javornik, Blaž Belec, Slavko Kralj, Darja LisjakAbstractIn this paper we present a major advance in the colloidal stabilization of nanoparticles in complex biological media that is one of the ongoing challenges for the usage of nanoparticles in biomedicine. A very common solution is to coat the nanoparticles surfaces with dextran via an electrostatic or coordinative attachment. The dextran molecules can be subsequently crosslinked to form a bioco...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

β-Chitin nanofiber hydrogel as a scaffold to in situ fabricate monodispersed ultra-small silver nanoparticles
Publication date: Available online 17 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Subin Song, Yan Zhao, Xiaoxue Yuan, Jinsong ZhangAbstractβ-chitin nanofibers (β-ChNFs) were efficiently prepared from squid pens by a combination of ball milling and ultrasonic techniques. The gellation of the β-ChNFs dispersion was achieved through a dialysis neutralization process, and hydrogels, even at 0.2% solid content, had high stiffness, as indicated by the dynamic viscoelasticity measurements. The β-ChNFs hydrogels were used as scaffolds to fabricate ultra-small sil...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Transport a of model diffusion probe in polyelectrolyte-surfactant hydrogels
In this study, two types of hydrogels were prepared: 1) based on hyaluronan and cationic surfactant septonex (carbethoxypendecinium bromide) and 2) based on diethylaminoethyl dextran and sodium dodecylsulphate. Nile red as a dye diffusion probe was incorporated into hydrogel in their preparation and then its release into surfactant solution and physiological saline was monitored. The release of NR from hydrogels was characterized by the effective diffusion coefficients of NR and structural parameters of hydrogels. The diffusion of NR in hydrogels was dependent on the molecular weight of polyelectrolyte and the ratio betwee...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

A STUDY ON FILM FORMATION AND FLUORESCENCE ENHANCEMENT OF PS LATEX/AgNPs COMPOSITES DEPENDING ON AgNPs CONTENT AND ANNEALING
Publication date: Available online 17 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Şaziye Uğur, Can Akaoğlu, Emre KüçükkahveciABSTRACTIn the work reported here, we investigated the characteristic change in film formation, optical, morphological and electrical properties of pyrene (P) labeled polystyrene (PS) latex/silver nanoparticles (AgNPs) (PS/AgNPs) composites by using steady state (SSF) and fast transient (FTRF) fluorescence techniques in conjunction with UV–VIS (UVV) technique. Nine different mixtures were prepared by mixing of PS latex dispers...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Compounding δ-MnO2 with Modified Graphene Nanosheets for Highly Stable Asymmetric Supercapacitors
Publication date: Available online 17 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Xiaoshuang Wang, Ling Chen, Shuoqing Zhang, Xiangcheng Chen, Yahao Li, Jingyan Liu, Feng Lu, Yongfu TangAbstractMnO2 is extremely attractive in the energy storage field, but the combination with highly conductive materials to enhance the electrical conductivity is still desired. Here we synthesize the composite of δ-MnO2 and glucose modified graphene nanosheets via a facile hydrothermal process. Graphene is transformed into 3D substrate by short-range self-assembly, on which MnO2 grows de...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Structure and stabilization mechanism of diesel oil-in-water emulsions stabilized solely by either positively or negatively charged nanoparticles
Publication date: Available online 17 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Qi Lin, Maodong Xu, Zhenggang Cui, Xiaomei Pei, Jianzhong Jiang, Binlei SongAbstractTwo diesel oil-in-water emulsions were formed by using positively charged alumina nanoparticles solely and negatively charged silica nanoparticls solely as emulsifier, respectively. The formal systems are typical Pickering emulsions in which alumina nanoparticles adsorb at oil/water interface endowing droplets very good stability, whereas the later systems are non-Pickering emulsions in which silica nanoparticle...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Fabrication of Short Peptide Cages by Interfacial Self-Assembly on CaCO3 Templates
Publication date: Available online 17 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Lu Feng, Peng Ren, Linna Hao, Qianqain Dong, Jieling Li, Honglei Jian, Meiyu Wang, Xin Li, Anhe Wang, Shuo BaiAbstractShort peptide cages have great potential applications in drug encapsulation and release because of excellent biocompatibility, biodegradability and multi-functionality originated from their abundant sequences. However, constructing short peptide cages are still a challenge, which is caused by the rapid kinetic and unlimited self-assembly behavior of short peptide in a macroscopi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 19, 2019 Category: Chemistry Source Type: research

Building Nanopore-Supported 2D Vesicles in Surfaces
Publication date: Available online 16 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Rocío Gimenez, Magalí Mercuri, Martín G. Bellino, Claudio L.A. BerliAbstractWater compartmentalization in a two-dimensional (2D) configuration is a challenging and thriving field. Here, we form fluid-fluid structures called 2D vesicles in which aqueous solutions are encapsulated within small oil barriers into a mesoporous thin film that allows them to communicate with a surrounding aqueous environment through predefined paths. Each area in the 2D space can also be programme...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 17, 2019 Category: Chemistry Source Type: research

Insulin amyloid fibrils-templated rational self-assembly of vine-tree-like PtRh nanocatalysts for efficient methanol electrooxidation
Publication date: Available online 16 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Li Hou, Yunfeng Niu, Yang Jiang, Tifeng Jiao, Yuanyuan Guo, Yanyan Zhou, Faming GaoAbstractShape-controlled synthesis of platinum-based alloy nanocatalysts with well-designed size and structure is essential for developing highly efficient catalysts. Here, a biomolecule-based strategy for the synthesis of vine-tree-like PtRh nanowires (VT-PtRhNWs) using insulin amyloid fibrils (INSAFs) as sacrificial templates is presented. In this structure, the inner PtRh nanowires behave as the rigid ‘t...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 17, 2019 Category: Chemistry Source Type: research

A straightforward procedure for the synthesis of silica@polyaniline core-shell nanoparticles
This study goes far beyond the simple synthetic procedure. It also evidences a general law that can be applied by all to anticipate the efficient encapsulation of silica nanoparticles by polyaniline. Here, silica nanoparticles of different sizes (90 to 300 nm) were firstly synthesized by Stöber process and then functionalized with N-[3-(Trimethoxysilyl)propyl]aniline. The last step implied the room temperature polymerization of aniline in the presence of these functionalized-silica nanoparticles using ammonium persulfate as oxidant. Several sets of particles were prepared using different amounts of aniline mono...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 17, 2019 Category: Chemistry Source Type: research

Colloidal dynamics and elasticity of dense wax particle suspensions over a wide range of volume fractions when tuning the softness by temperature.
We report on the colloidal dynamics and rheology of liquid droplet emulsions and solid particle suspensions over a wide range of volume fractions. Diffusing wave spectroscopy and rheometry were utilized to study the micro/macroscale properties of 1-eicosene wax particles dispersed in water. By changing the temperature, the wax droplets change their properties from soft to hard or vice versa, which, depending on the density, may affect the system properties in a different way. Our measurements in the high volume fraction regime focus on the elasticity index and the plateau storage modulus, Gp′. The results show a more...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 17, 2019 Category: Chemistry Source Type: research

The reinforced photocatalytic performance of binary-phased composites Bi-Bi12O17Cl2 fabricated by a facile chemical reduction protocol
Publication date: Available online 15 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Fei Chang, Bin Lei, Xiaoya Zhang, Quan Xu, Hongyu Chen, Baoqing Deng, Xuefeng HuAbstractPhotocatalysis has been considered as an environmentally benign and sustainable technology for contaminants remediation and energy storage and the crucial issue is to design and fabricate catalysts with high visible-light sensitivity and photocatalytic performance. In this work, a series of binary-phased semi-metallic Bi decorated Bi12O17Cl2 composites (Bi-BOC) were constructed via a facile in-situ chemical ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 16, 2019 Category: Chemistry Source Type: research

Microfluidic production of snowman-shaped Janus hydrogel particles
We present a simple microfluidic-based synthesis protocol to fabricate snowman like Janus hydrogel particles of poly(N-isopropylacrylamide) (PNIPAM) in micron length scale. Particles are synthesized by emulsifying a hydrogel solution (water (w)/oil (o)) followed by partial solvent evaporation. Solvent evaporation allows the hydrogels to concentrate within the droplet and phase separate into a monomer-abundant and a sparse phase. Due to the difference in interfacial tension and chemical properties of the two phases, emulsion droplets are deformed into snowman like Janus droplets. After cross-linking the monomer by UV irradi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 16, 2019 Category: Chemistry Source Type: research

Electrocapacitive behavior of colloidal nanocrystal assemblies of manganese ferrite in multivalent ion electrolytes
Publication date: Available online 15 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Haiyan Wang, Yunchang Sun, Zhen Li, Hongliang Li, Peizhi GuoABSTRACTManganese based materials have been considered to be one type of important electrode materials in energy storage and conversion devices. Two types of colloidal nanocrystal assemblies (CNAs) of MnFe2O4 had been investigated as the electrode materials by using aqueous electrolytes containing bivalent and trivalent metal ions. Experimental results showed that CNAs assembled by 16 nm nanocrystals (MnFe-1Sf) displayed specifi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 16, 2019 Category: Chemistry Source Type: research

Electrochemical Fabrication of Superhydrophobic Passive Films on Aeronautic Steel Surface
Publication date: Available online 15 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Ziai Liu, Fan Zhang, Yang Chen, Heng Zhang, Yuqi Han, Jiyu Liu, Liu Huang, Xin LiuAbstractAeronautic steel is widely used as the structural material in aircrafts. The inherent hydrophilicity of aeronautic steel will result in water clinging and ice adhesion in humid environment, which seriously affect the stability of aircrafts. Therefore, fabrication of superhydrophobic surface on aeronautic steel substrate has considerable industrial significance in improving its service life in humid environ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 16, 2019 Category: Chemistry Source Type: research

Dynamic properties and relaxation processes in surface layer of pulmonary surfactant solutions
Publication date: Available online 15 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): A.G. Bykov, G. Loglio, R. Miller, O.Y. Milyaeva, A.V. Michailov, B.A. NoskovAbstractIn this work, dynamic surface properties of spread monolayers of DPPC and adsorbed layers of PS solutions were investigated in a broad range of surface pressure. Application of a modified Langmuir trough and a recently developed approach for the analysis of a non-linear response of the adsorption layer to large surface deformations gives a possibility to determine the dilational surface elasticity in the region ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 16, 2019 Category: Chemistry Source Type: research

Photothermal catalytic effect of Pd-TiO2/CNFs composite catalyst in Suzuki coupling reaction
Publication date: Available online 13 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jing Wang, Jie Bai, Haiou Liang, Chunping LiAbstractThis paper reported a method for loading TiO2 and Pd atoms onto carbon nanofibers (CNFs) under a simple mild conditions. The catalyst prepared by the method greatly improved the reaction efficiency of Suzuki under the illumination of xenon lamp and reduced the difficulty of the reaction conditions. Compared with the previous catalysts, the catalysts developed in this paper have the characteristics of simple preparation method, easy recovery, g...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 14, 2019 Category: Chemistry Source Type: research

Adsorption/desorption behavior of cationic and anionic dyes by biochars prepared at normal and high pyrolysis temperatures
Publication date: Available online 13 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jong-Hwan Park, Jim J. Wang, Yili Meng, Zhuo Wei, Ronald D. DeLaune, Dong-Cheol SeoAbstractThe purpose of this study was to determine the properties of biochar prepared at higher than normal biochar production temperature and to evaluate adsorption/desorption characteristics for three commonly used dyes of different charge and molecular nature: Methylene Blue (MB), Orange G (OG) and Congo Red (CR). The switchgrass-biochar was prepared at common pyrolysis temperature of 600 °C (SB600)...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 14, 2019 Category: Chemistry Source Type: research

Structural and surface properties control the recovery and purity of bio- hyaluronic acid upon precipitation with isopropyl alcohol
Publication date: Available online 13 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): André D.D. Cavalcanti, Maria H.A. SantanaABSTRACTMicrobial hyaluronic acid (bio-HA) is a highly valued product due to its wide range of aesthetic and medical applications. High purity is an essential requirement for those applications. HA is a polyelectrolyte susceptible to structural changes with pH; therefore, precipitation with organic solvents is attractive as a downstream processing step. However, its high hydration capacity requires a low dielectric constant solvent such as isoprop...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 14, 2019 Category: Chemistry Source Type: research

Magnetic Fe3O4 Supported PdAu Bimetallic Nanoparticles with the Enhanced Catalytic Activity for Heck and Suzuki Cross-Coupling Reactions
Publication date: Available online 12 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Xiao Chen, Dejian Qian, Guodong Xu, Hui Xu, Jingtao Dai, Yukou DuAbstractThe PdAu bimetallic nanocrystals supported on Fe3O4 magnetic nanoparticles (PdAu/Fe3O4) were synthesized by a facile incipient wetness impregnation method. The as-synthesized bimetallic catalyst PdAu/Fe3O4 exhibits significantly enhanced catalytic properties for Heck cross-coupling reaction under aerobic condition compared to the monometallic counterparts. The enhanced catalytic activity is attributed to the low-alloyed st...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 13, 2019 Category: Chemistry Source Type: research

Temperature-sensitive semi-IPN composite hydrogels for antibacterial applications
Publication date: Available online 12 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jayaramudu Tippabattini, Varaprasad Kokkarachedu, Rotimi Sadiku Emmanuel, Amalraj JohnAbstractThis investigation aims to develop bacterial-resistant temperature-sensitive semi-IPN silver composite hydrogels via a three-step method. Primarily, the temperature-sensitive semi-IPN hydrogels of N-isopropylacrylamide and various concentrations of Pluronic F-127 (PF 127), have been prepared via a free radical polymerization technique. Furthermore, silver ions were encapsulated in the temperature-sensi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 13, 2019 Category: Chemistry Source Type: research

Enzyme-conjugated gold nanoparticles for combined enzyme and photothermal therapy of colon cancer cells
Publication date: Available online 12 April 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Mostafa Akbarzadeh Khiavi, Azam Safary, Ayuob Aghanejad, Jaleh Barar, Seyed Hossein Rasta, Asal Golchin, Yadollah Omidi, Mohammad Hossein SomiAbstractThe current investigation introduces an advanced and effective tumor therapeutic RnaGNPs nanobiomedicine composed of gold nanoparticles (GNPs) conjugated with bovine pancreatic ribonuclease (RNase A). The engineered nanobiomedicine was used to overcome the intracellular ribonuclease inhibitors (RIs) as one of the most important obstacles for the c...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 13, 2019 Category: Chemistry Source Type: research

Preparation of Collagen/Chitosan Microspheres for 3D Macrophage Proliferation in vitro
This study highlights opportunities for development of high-effective cell proliferation approach and provides a great promise in immune cell based immunotherapy.Graphical abstract (Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects)
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - April 13, 2019 Category: Chemistry Source Type: research