Ag2S decorated nanocubes with enhanced near-infrared photothermal and photodynamic properties for rapid sterilization
Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Ke Xiong, Jun Li, Lei Tan, Zhenduo Cui, Zhaoyang Li, Shuilin Wu, Yanqin Liang, Shengli Zhu, Xiangmei LiuAbstractInfectious diseases caused by bacteria is always a serious problem. In this work, Ag2S nanoparticles decorated nanocubes (Ag2S/NCs) were synthesized, in which NCs were obtained by pyrolyzing the metal-organic frameworks (MOFs) at 800 °C while Ag2S were prepared by a simple ultrasonic process and solvent reaction. The former carbon nanocubes exhibited an excellent photothermal conversion efficiency of 29%...
Source: Colloids and Interface Science Communications - October 12, 2019 Category: Nanotechnology Source Type: research

Modeling of kinetic adsorption of natural surfactants on sandstone minerals: Spotlight on accurate prediction and data evaluation
Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Shayan Faghihi, Amin Keykhosravi, Khalil ShahbaziAbstractSurfactant injection is a tertiary enhanced oil recovery (EOR) method which aims to improve trapped oil production by wettability alteration of rock surface and also interfacial tension reduction. Surfactants adsorption is an important parameter which needs to be considered before their application in EOR methods. In this paper, least square support vector machine was used as a robust approach for accurate prediction and modeling surfactants adsorption on sandston...
Source: Colloids and Interface Science Communications - October 12, 2019 Category: Nanotechnology Source Type: research

Synthesis, physicochemical characteristics and antimicrobial studies of ethyl-substituted imidazolium-based surface active ionic liquids (SAILs)
Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Arifa Shaheen, Rabia Arif, Ab Waheed Mir, Sumbul RehmanAbstractA series containing higher members of ethyl-substituted imidazolium-based surface active ionic liquids (SAILs) [Cneim]Br, (n = 12, 14, 16) has been synthesized by a two-step reaction pathway. They were characterized by FT-IR, 1H NMR and 13C NMR and their effect on self-aggregation behavior in aqueous solution has been examined, employing conductometric and tensiometric methods besides fluorescence measurements and UV-visible spectroscopy. The conductivit...
Source: Colloids and Interface Science Communications - September 18, 2019 Category: Nanotechnology Source Type: research

Antibody conjugated green synthesized chitosan-gold nanoparticles for optical biosensing
In this study a novel antibody conjugated chitosan-gold nanoparticles (Ab-CS-GNPs) was engineered by the green synthesized method for detection of the target antigen (Ag) by three different types of optical biosensing system (colorimetric, localized surface plasmon resonance (LSPR) and paper-based dot-blot). Colloidal GNPs was synthesized by chitosan as reducer and stabilizer agent. For paper-based dot-blot detection, antibodies were conjugated to CS-GNPs surface and applied as nanobioprobe to the detection of spotted Ag on nitrocellulose (NC) membrane by the naked eye. Dot-blot assay results showed that the limit of detec...
Source: Colloids and Interface Science Communications - September 15, 2019 Category: Nanotechnology Source Type: research

Evaluating the internal structure of monodispersed mesoporous silica spheres by small-angle X-ray scattering
Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Masashi Harada, Tadashi Nakamura, Kazuhisa YanoAbstractAlthough the spherical morphology and mesoporous structure of monodispersed mesoporous silica spheres (MMSS) have been extensively investigated by scanning electron microscopy and transmission electron microscopy, the statistical distribution of mesopores from the surface to the center of a particle, average density of the spheres, and volume fraction of silica have not been investigated. Herein, small-angle X-ray scattering (SAXS) was performed on aqueous dispersio...
Source: Colloids and Interface Science Communications - September 14, 2019 Category: Nanotechnology Source Type: research

Collection of nanoparticles at the air-liquid interface by surface tension gradients
Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Dong Liu, Ding Weng, Jiadao WangAbstractParticles such as nano-plastics at the air-liquid interface is harmful to the environment. Due to small size of the nanoparticles, expensive materials are needed to collect them such as ultrafiltration membranes. In our study, we propose an easy method to collect the nanoparticles at the air-liquid interface. Because surface tension of contaminated water is lower than that of deionized water, the surface tension gradient is used to transport the nanoparticles. In our study, we wet...
Source: Colloids and Interface Science Communications - September 14, 2019 Category: Nanotechnology Source Type: research

Synthesis and characterization of chemically-reactive solubilization surfactants for membrane proteins and preparation of membrane protein hydrogel microfibers
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Aki Taniguchi, Shuhei Koeda, Tomoyasu Noji, Keisuke Kawakami, Natsumi Sumito, Takehisa Dewa, Shigeru Itoh, Nobuo Kamiya, Toshihisa MizunoAbstractWe herein report the synthesis and characterization of unique chemically reactive solubilization surfactants, Alk-DKDKC12K and Bis-alk-DKDKC12K that consist of the DKDKC12K unit, previously reported to function as a novel class of lipopeptide-based solubilization surfactant for membrane proteins such as photosystem I (PSI) derived from cyanobacteria, and one or two alkyne grou...
Source: Colloids and Interface Science Communications - September 12, 2019 Category: Nanotechnology Source Type: research

Aggregation behavior of short-chained archaeal phospholipid analogs: Contribution of methyl branches to lipid hydrophobicity and membrane formability
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Hiroshi Komatsu, Kiyotaka Sakai, Teruhiko Baba, Toshiyuki Takagi, Toshiyuki KanamoriAbstractThe aggregation behavior of short-chained archaeal phospholipid analogs (DCn+mPCs, (n, m) = (4, 1) and (8, 2), n: number of carbon atoms in the single main chain; m: number of methyl branches in one chain. PC denotes phosphatidylcholine) in water was investigated as a function of the hydrophobic chain length and the glycerol-linkage type (ester or ether bond), using fluorescent probe method, polarized light microscopy and XR...
Source: Colloids and Interface Science Communications - September 11, 2019 Category: Nanotechnology Source Type: research

Combined effects of Marangoni, sedimentation and coffee-ring flows on evaporative deposits of superparamagnetic colloids
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Alexis Darras, Nicolas Vandewalle, Geoffroy LumayAbstractEvaporation of sessile colloidal droplets is a way to organize suspended particles. It is already known that the composition of the surrounding fluid modifies the dried deposit. For superparamagnetic particles, recent studies showed that external magnetic fields can act as remote controls for those deposits. In this paper, we study the configuration space given by the interplay of such fields and a modification of the fluid composition by considering various conc...
Source: Colloids and Interface Science Communications - August 24, 2019 Category: Nanotechnology Source Type: research

Atomic-like motion of coverslips at the air-water interface
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Dong Liu, Awais Mahmood, Ding Weng, Jiadao WangAbstractAtomic-like motion of coverslips (their surfaces drip with 70 vol% aqueous ethanol) is that the coverslips attract each other over a long distance, but repel when they are almost in contact. When they are placed at a considerable distance, the two coverslips get attracted towards each other. However, when the separating distance between them is reduced to a near contact point, they start to repel. According to our research, there are mainly two opposite forces ac...
Source: Colloids and Interface Science Communications - August 24, 2019 Category: Nanotechnology Source Type: research

Bile acids adsorption by chitoan-fumed silica enterosorbent
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Tetyana M. Budnyak, Nataliya N. Vlasova, Lyudmila P. Golovkova, Adam Slabon, Valentin A. TertykhAbstractHybrid composites from chitosan and fumed silica were synthesized and applied for the adsorption of bile acids (BA), e.g. cholic (CA) and taurocholic (TCA) acids. The chitosan immobilization was confirmed by infrared spectroscopy and the corresponding stability of the composites was confirmed by tests with the analytical reagent ninhydrin. The effects of adsorption parameters such as initial concentration of BA and p...
Source: Colloids and Interface Science Communications - August 9, 2019 Category: Nanotechnology Source Type: research

Courier properties of modified citrus pectinate-chitosan nanoparticles in colon delivery of curcumin
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Rayan Sabra, Clive J. Roberts, Nashiru BillaAbstractWe aimed to probe the carrier properties of a colon-targeted curcumin-containing modified pectinate-chitosan nanoparticulate carrier system (MCPCNPs), in simulated colonic condition. The MCPCNPs were prepared via ionic gelation. There was a reduction in zeta potential (ZP) of the MCPCNPs at pH 1.2 and a more significant reduction at pH 7.0, both mucin concentration-dependent. A reduction in ZP correlates mucoadhesive propensity. Nanoparticle tracking analyses (NTA...
Source: Colloids and Interface Science Communications - August 6, 2019 Category: Nanotechnology Source Type: research

Synthesis of dimpled and submicron-sized polymer particles of different morphologies using free micromixer
In this report, we propose a new method for synthesizing dimpled and submicron-sized polystyrene (PS) particles using a novel microfluidic device called the free micromixer (FMM). We could successfully synthesize dimpled and submicron-sized particles of various morphologies by controlling the concentration of PS and the temperature of the poor solvent used before mixing within the FMM. Formation of the particles can be attributed to the electrical charge of the polymer used for forming the particles.Graphical abstract (Source: Colloids and Interface Science Communications)
Source: Colloids and Interface Science Communications - July 27, 2019 Category: Nanotechnology Source Type: research

Size-dependent antibacterial activity of copper nanoparticles against Xanthomonas oryzae pv. oryzae – A synthetic and mechanistic approach
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Tapodhara Datta Majumdar, Mukesh Singh, Mala Thapa, Moumita Dutta, Abhishek Mukherjee, Chandan Kumar GhoshAbstractXanthomonas oryzae pv. oryzae (X. oryzae), causing devastating bacterial leaf blight (BLB) disease in rice, is fast developing resistance against many available antibiotics, warranting an urgent need to develop an alternative control strategy. In this manuscript, we report copper nanoparticles (CuNPs) as an effective antibacterial agent against X. oryzae. We synthesized four different sized CuNPs in a narro...
Source: Colloids and Interface Science Communications - July 24, 2019 Category: Nanotechnology Source Type: research

Green synthesis of silver nanoparticles using Combretum erythrophyllum leaves and its antibacterial activities
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Olufunto T. Jemilugba, El Hadji Mamour Sakho, Sundararajan Parani, Vuyo Mavumengwana, Oluwatobi S. OluwafemiAbstractA simple, green, cost effective and environmentally benign method for the synthesis of silver nanoparticles (Ag-NPs) using aqueous extract of Combretum erythrophyllum plant leaves as both the reducing and capping agents is herein reported for the first time. The as-prepared Ag-NPs were characterised using Ultraviolet–Visible (UV–Vis) absorption spectroscopy, transmission electron microscopy (TEM), ...
Source: Colloids and Interface Science Communications - July 12, 2019 Category: Nanotechnology Source Type: research

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Benoît Gouze, Thibaud Nardin, Olivier Diat, Julien CambedouzouAbstractSemifluorinated alkanes (SFA) are diblock molecules able to self-assemble in various organic media due to their fluorophilic/fluorophobic interactions. Such mixtures accordingly represent a model system for the further elaboration of soft-templated inorganic materials in totally anhydrous media. The aggregation behavior of four SFA species has been studied in two different organic and cyclic solvents in function of temperature by small angle X-ray s...
Source: Colloids and Interface Science Communications - July 3, 2019 Category: Nanotechnology Source Type: research

Synthesis and properties of alumina-hydroxyapatite composites from natural phosphate for phenol removal from water
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): K. Bouiahya, I. Es-saidi, C. El Bekkali, A. Laghzizil, D. Robert, J.M. Nunzi, A. SaoiabiAbstractPhenol is very abundant in the aquatic environment and therefore requires an effective treatment using porous and low-cost adsorbents. Alumina-hydroxyapatite composites were prepared from natural phosphate ore in the presence of Al3+ ions via a wet-chemical method. Porous composites were characterized and the Al-surface modification was produced by facile and inexpensive route to uptake adjacent toxic species. Supplementary activ...
Source: Colloids and Interface Science Communications - July 3, 2019 Category: Nanotechnology Source Type: research

Mild synthesis of single-nanosized plasmonic copper nanoparticles and their catalytic reduction of methylene blue
In this study, we report a mild synthesis of sub-10 nm Cu nanoparticles (NPs) in ethylene glycol (EG) at room temperature using l-ascorbic acid (AA) as the reducing agent in the presence of 1-amino-2-propanol (AMIP). To the best of our knowledge, this work is the first report of the room-temperature synthesis of sub-10 nm Cu NPs using a nontoxic reducing agent. The as-prepared colloidal suspension of Cu NPs exhibited surface plasmon resonance absorption at 515 nm. Transmission electron microscopy observations revealed well-dispersed spherical Cu NPs with an average particle size of 4.1 ± 0.8 nm. The use ...
Source: Colloids and Interface Science Communications - June 15, 2019 Category: Nanotechnology Source Type: research

Boundary lubrication properties and contact mechanism of carbon/MoS2 based nanolubricants under steel/steel contact
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Ram Krishna Upadhyay, Arvind KumarAbstractLubrication mechanism of some carbon-based nanoparticles is unresolved and needs proper attention. In this work, friction and wear properties of carbon/MoS2 solid lubricants are tested in the boundary lubrication regime and further compared with oil-based binary and ternary nanolubricants. Results show that MWCNT and fullerene have high values of friction coefficient and wear rate in a dry medium. However, in lubricated medium with fomblin oil, they comply with the boundary lubricat...
Source: Colloids and Interface Science Communications - May 17, 2019 Category: Nanotechnology Source Type: research

Modeling of a charged dielectric interface: Comparison of the continuum and discrete lattice representations of surface charges
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Jiaxing Yuan, Yanwei WangAbstractTwo main approaches in particle-based simulations for modeling a charged surface are using explicit, discrete charges and continuum, uniform charges. It is well-known that these two approaches could lead to substantially distinct ionic distributions, whereas a systematic exploration of the origin is still absent. In this short communication, we calculate the electrostatic force of a single point charge above a planar substrate characterized by a surface charge density and dielectric mismatch ...
Source: Colloids and Interface Science Communications - April 29, 2019 Category: Nanotechnology Source Type: research

Design of nanoporous titania-supported methylene blue molecules for efficient singlet oxygen generation under red light exposure
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Iori Yamada, Ryota Ikeda, Shinya Nagata, Masaya Kakuta, Motohiro TagayaAbstractThe methylene blue (MB) adsorption states on the titania nanoparticles (NPs) prepared by two surfactant removal processes were investigated to demonstrate the singlet oxygen generation efficiency. The NPs with the BET surface areas of 250–350 m2/g exhibited the spherical particle sizes of 100–150 nm, indicating the nanoporous structures. The MB molecular states adsorbed on the NPs prepared by solvent extraction method (WT) were att...
Source: Colloids and Interface Science Communications - April 29, 2019 Category: Nanotechnology Source Type: research

Adsorption Mechanisms of Psychoactive Drugs onto Montmorillonite
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Thomas Thiebault, Mohammed BoussafirAbstractThe adsorption of psychoactive drugs (PADs) onto sodium-exchanged montmorillonite (Na—Mt) was investigated under two pH conditions. At pH = 2.5, the adsorption was performed through cation exchange and the three PADs were intercalated within the Na—Mt layers. However, the adsorption capacity was lower than the theoretical cation exchange capacity of Na—Mt due to the impact of the acidic conditions on the adsorbent. At pH = 7.5, only Codeine was protonated ...
Source: Colloids and Interface Science Communications - April 26, 2019 Category: Nanotechnology Source Type: research

Immobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid in layered octacalcium phosphate
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Iori Yamada, Motohiro TagayaAbstractImmobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid (Bpdc) into layered octacalcium phosphate was investigated in the hydrolysis process of α-tricalcium phosphate. 100 interlayer distance altered from 1.9 to 2.5–2.7 nm by the immobilization, suggesting the novel inorganic/organic nanohybrids. The nanohybrids exhibited the blue-shifted photoluminescence peaks with the higher internal quantum efficiency as compared with the case in the Bpdc alone.Graphical abst...
Source: Colloids and Interface Science Communications - April 19, 2019 Category: Nanotechnology Source Type: research

Interfacial rheological behaviour of lentil protein isolate-fenugreek gum complex
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Pravin Vasant Gadkari, Natalie Longmore, Martin Reaney, Supratim GhoshAbstractThe interfacial adsorption and interfacial shear viscoelasticity of lentil protein isolate (LPI) and fenugreek gum (FG) complexes against canola oil were determined at pH 2 and 7 to understand their effectiveness as emulsifiers. The interfacial elastic moduli of LPI-FG complexes were stronger at pH 2 compared to pH 7. In contrast, the biopolymer interface at pH 7 was able to withstand higher strain before breaking compared to that at pH 2...
Source: Colloids and Interface Science Communications - April 13, 2019 Category: Nanotechnology Source Type: research

Recent advancements in silica nanoparticles based technologies for removal of dyes from water
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Sushilkumar A. Jadhav, Harshada B. Garud, Aravind H. Patil, Gajanan D. Patil, Chetan R. Patil, Tukaram D. Dongale, Pramod S. PatilAbstractSilica and silica based hybrid nanoparticles are investigated with great interest for the removal of dyes from water. The presence of surface silanols which can complex the dyes, ease of grafting of additional functionalities to improve the complexation, the possibility of photocatalyst grafting for dye degradation and good chemical stability are the reasons for the excellent efficiency of...
Source: Colloids and Interface Science Communications - April 13, 2019 Category: Nanotechnology Source Type: research

Cascade sensing of iodide and fluoride by tryptophan derived low molecular weight gelator
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Mrittika Mohar, Tanmay DasAbstractAn optical cascade sensor of iodide and fluoride ions based on simple tryptophan derivative containing urea functional group has been designed and synthesized via one-step reaction and characterized by different spectroscopic techniques. The tetrahydrofuran solution of the sensor becomes yellow in the presence of iodide ion and this binary yellow solution shows bright green emission under 366 nm UV irradiation in the presence of fluoride ion. The sensor is one of the very few examples of c...
Source: Colloids and Interface Science Communications - March 29, 2019 Category: Nanotechnology Source Type: research

Development of sulfonate-functionalized hydroxyapatite nanoparticles for cadmium removal from aqueous solutions
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Abdeladim Oulguidoum, Habiba Bouyarmane, Abdelaziz Laghzizil, Jean-Michel Nunzi, Ahmed SaoiabiAbstractSulfonate-functionalized hydroxyapatite was successfully synthesized by organo-functionalization using natural phosphate and Benzenedisulfonate molecules. The modified apatites were characterized using multiple techniques, evidencing the effective incorporation of organo-functional groups into the hydroxyapatite matrix. Sulfonated mesoporous hydroxyapatite possesses a large amount of accessible -SO3 acid groups, which may be...
Source: Colloids and Interface Science Communications - March 29, 2019 Category: Nanotechnology Source Type: research

Importance of solvent singularity on the formation of highly uniform hexagonal close packed (HCP) colloidal monolayers during spin coating
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): P. Noppakuadrittidej, K. Tonsomboon, S. UmmartyotinAbstractHighly uniform hexagonal close packed (HCP) colloidal monolayers are extremely essential for the development of photonic, optical, and biosensing devices. Even though high quality HCP colloidal structures can be obtained with vertical deposition (VD), this traditional method is time-consuming and not scalable. Spin coating (SC) has recently been used as an alternative method due to its high production rate, scalability and versatility. However, a few attentions have ...
Source: Colloids and Interface Science Communications - March 27, 2019 Category: Nanotechnology Source Type: research

Garlic essential oil nanophytosomes as a natural food preservative: Its application in yogurt as food model
In this study, encapsulation of garlic essential oil (GEO) in nanophytosomes as a novel phytoconstituents delivery system was performed via three different methods. The physicochemical characterization of nanophytosomes were studied by dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) and also antioxidant activity, physical stability and antibacterial effects against food-borne pathogens i.e. Escherichia coli and Staphylococcus aureus were investigated. Optimized GEO nanophytosomes showed promising results with the size of 115 nm, loading capacity of 40...
Source: Colloids and Interface Science Communications - March 17, 2019 Category: Nanotechnology Source Type: research

How to make microscale pores on a self-assembled Ag nanoparticle monolayer
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Haruka Takekuma, Kyohei Tagomori, Shuhei Shinohara, Shihomi Masuda, Yang Xu, Yinthai Chan, Pangpang Wang, Sou Ryuzaki, Koichi Okamoto, Kaoru TamadaAbstractIn this short communication, we report a procedure for the fabrication of microscale pores on a rigid self-assembled Ag nanoparticle monolayer with nanothickness. Here, condensed water droplets on a hydrophobic substrate are used as a pore formation template for Langmuir-Schaefer film deposition. The optical properties of the Ag nanoparticle monolayer were influenced by th...
Source: Colloids and Interface Science Communications - March 14, 2019 Category: Nanotechnology Source Type: research

Experimental and theoretical study of the mechanism formation of silver nanoclusters in the reduction reaction of Ag+ ions by alizarin solution
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Valentina A. Litvin, Boris F. Minaev, Gleb V. BaryshnikovAbstractFor the study of the processes of the Ag+ ions interaction with humic substances a low molecular weight model compound – alizarin – was used for the first time in the present work. It has been established that alizarin carries out a double role in the process of synthesis of silver nanoparticles: reducing agent of Ag+ ions and a stabilizer of the formed nanoparticles. Based on the analysis of experimental data a mechanism of silver nanoparticles f...
Source: Colloids and Interface Science Communications - February 28, 2019 Category: Nanotechnology Source Type: research

Corrosion behavior of two low alloy steel in simulative deep-sea environment coupling to titanium alloy
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Weijie Fan, Yong Zhang, Huiwen Tian, Wei Wang, Weihua LiAbstractCorrosion behavior of two different low alloy steels (specimen 1, specimen 2) coupling to titanium (Ti) alloy was studied in simulative deep-sea environment with 500 m depths. Immersion tests revealed that the corrosion rate of specimen 1 was higher than that of specimen 2. The micro morphology showed all specimens of specimen 1 steel was susceptible to both intergranular and pitting corrosion. Electrochemical results imply that the galvanic current of speci...
Source: Colloids and Interface Science Communications - February 22, 2019 Category: Nanotechnology Source Type: research

Unveiling the Synergistic Effect of ZnO Nanoparticles and Surfactant Colloids for Enhanced Oil Recovery
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Marwan Y. Rezk, Nageh K. AllamAbstractAlthough chemical flooding is widely used to enhance oil productivity at lower cost, the continuously increasing prices of chemicals is a real barrier to achieve such an aim. Hence, various ways have been explored to reduce the amount of chemicals used while yielding the same performance or even higher to make the whole process cost efficient. Herein, we investigate the use of zinc oxide nanoparticles (ZnO NPs) to improve the surfactant-based extraction of an organic fluid (n- dodecane...
Source: Colloids and Interface Science Communications - January 26, 2019 Category: Nanotechnology Source Type: research

Ultrasound-Assisted Synthesis and Characterization of Heparin-Coated Eu3+ Doped Hydroxyapatite Luminescent Nanoparticles
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Qingguo Xing, Xiaojun Zhang, Dulan Wu, Yingchao Han, M. Nirmali Wickramaratne, Honglian Dai, Xinyu WangAbstractHerein, the heparin-coated Eu3+ doped hydroxyapatite luminescent nanoparticles were synthesized by an ultrasound-assisted coprecipitation method followed with steam sterilization at 121 °C. The effects of ultrasound treatment, steam sterilization, sodium heparin (SH) concentration and Eu doping content on the formation of heparin-coated Eu3+ doped hydroxyapatite nanoparticles (SH-Eu:nHAP) were investigated. ...
Source: Colloids and Interface Science Communications - January 17, 2019 Category: Nanotechnology Source Type: research

Design and In Vitro Evaluation of Atovaquone Nanosuspension Prepared by pH Based and Anti-solvent Based Precipitation Method
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Harsha Kathpalia, Siddhesh Juvekar, Supriya ShidhayeAbstractThe aim of the research was to design a novel pH based precipitation method for formulation of atovaquone nanosuspension. The study compares efficiency of two bottom-up methods namely, pH and anti-solvent based precipitation to reduce particle size of atovaquone. The anti-solvent precipitation method uses tetrahydrofuran as the solvent with poloxamer and povidone as stabilizers. The pH based precipitation method includes sodium hydroxide as basifying agent in comb...
Source: Colloids and Interface Science Communications - January 17, 2019 Category: Nanotechnology Source Type: research

Efficacy of Biogenic Selenium Nanoparticles from an Extract of Ginger towards Evaluation on Anti-Microbial and Anti-Oxidant Activities
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): Soumya Menon, Shrudhi Devi K.S., Happy Agarwal, Venkat Kumar ShanmugamAbstractBiogenic method of synthesis of nanoparticles is being preferred over the conventional chemical and physical methods due to its reduced toxicity towards the environment which uses living organisms like plants, microalgae and other microorganisms. The biomolecules present help in the reduction of Sodium Selenite to its elemental form Selenium nanoparticles. Z. officinale was used for the synthesis of selenium nanoparticles which was confirmed by t...
Source: Colloids and Interface Science Communications - January 10, 2019 Category: Nanotechnology Source Type: research

Shape dependent catalytic activity of unsupported gold nanostructures for the fast reduction of 4-nitroaniline
Publication date: March 2019Source: Colloid and Interface Science Communications, Volume 29Author(s): S.G. Jiji, K.G. GopchandranAbstractA one step seed mediated strategy is adopted here for synthesizing spherical, dog bone and rod shaped gold nanoparticles. Usually noble metals decorated by supporting materials are used for chemical catalysis. Here, a variety of unsupported gold nanoparticles (spherical, dog bone and rod shaped) originating from the same growth procedure are used for the catalytic reduction of para-nitroaniline (4-NA). The product obtained, para-phenylenediamine, is an important material, especially in th...
Source: Colloids and Interface Science Communications - January 10, 2019 Category: Nanotechnology Source Type: research

Inverse-Micelle Synthesis of Doxorubicin-Loaded Alginate/Chitosan Nanoparticles and In Vitro Assessment of Breast Cancer Cytotoxicity
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Justin G. Rosch, Hayden Winter, Allison N. DuRoss, Gaurav Sahay, Conroy SunAbstractNaturally-derived polysaccharides, such as alginate and chitosan, can be assembled to form nanocarriers for the delivery of therapeutic agents. Here we exploit the electrostatic complexation of alginate/chitosan in a water-in-oil (w/o) emulsion process to produce doxorubicin (DOX)-loaded nanoparticles (~80 nm) with exceptional spherical morphology and uniformity. This robust synthetic route utilizes an aqueous phase dispersed in a cycloh...
Source: Colloids and Interface Science Communications - December 27, 2018 Category: Nanotechnology Source Type: research

Bactericidal effect of graphene oxide and reduced graphene oxide: Influence of shape of bacteria
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Iman Sengupta, Proma Bhattacharya, Monikangkana Talukdar, Sudarsan Neogi, Surjya K. Pal, Sudipto ChakrabortyAbstractThe emergence of multi-drug resistant bacteria due to the misuse of antibiotics and inadequate development of antibiotic drugs is a global threat to human health. Recent development in materials research caused the emergence of nanomaterials with promising bactericidal properties. Carbon based nanomaterials like graphene and graphene oxide(GO) have appealed researchers for antimicrobial properties, although...
Source: Colloids and Interface Science Communications - December 22, 2018 Category: Nanotechnology Source Type: research

Failure of Particle-Laden Interfaces Studied Using The Funnel Method
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Brian L. Kim, Abigail Rendos, Prithika Ganesh, Keith A. BrownAbstractWe develop a method to explore the mechanical response of particles on a liquid-air interface under biaxial tension. Particles were laser cut with designed 2D geometries that interact in a predictable manner through capillary effects. When such particles were arranged into a raft on the water-air interface in a funnel, raising the water level induced deformation and ultimately failure of the raft. While particles that strongly attract one another can be...
Source: Colloids and Interface Science Communications - December 6, 2018 Category: Nanotechnology Source Type: research

Real-Time Interaction of Mixed Species Biofilm With Silver Nanoparticles Using QCM-D
This study presents a novel approach to probe in situ, real-time changes in mixed-species biofilms via quartz crystal microbalance with dissipation (QCM-D). The viscoelasticity of a model wastewater biofilm was monitored by QCM-D, and quantitative changes in both measured frequency, ∆f, and dissipation, ∆D, reflected biofilm structural changes in the presence of silver nanoparticles (Ag-NPs). Complimentary results from confocal laser scanning microscopy confirmed biofilm attachment and the presence of live cells. A step-input experiment with increasing concentrations of Ag-NPs (127, 666, 1160, 1632 ppb) was performed...
Source: Colloids and Interface Science Communications - November 30, 2018 Category: Nanotechnology Source Type: research

Chloramphenicol Loaded Microemulsions: Development, Characterization and Stability
This study aimed to formulate and characterize microemulsions containing chloramphenicol. Microemulsions represent highly biocompatible drug delivery systems due to their potential for increased absorption as well as high solubilization capacity. MEs were composed of Oleic acid, non-ionic surfactants tween 20/60, 1-propanol and phosphate buffer. The optimum weight ratios of components and MEs areas were determined by pseudo-ternary phase diagram. All formulations were physically characterized by centrifugation, pH, refractive index, conductivity, viscosity, surface tension and partition coefficient. The specific residence ...
Source: Colloids and Interface Science Communications - November 28, 2018 Category: Nanotechnology Source Type: research

Immobilization of Anti-Inflammatory Drug on Exfoliated α-Zirconium Phosphate as a pH-Responsive Carrier
In this study, the preparation and characterization of a hybrid material of a biologically active drug and α-zirconium phosphate (α-ZrP) were investigated with the aim toward developing a novel drug delivery system. Thus, bromfenac sodium (BFS) as an anti-inflammatory drug was immobilized on α-ZrP hydrogel prepared from the exfoliation of α-ZrP using propylamine. The amount of BFS immobilized on the α-ZrP hydrogel was 6.9 wt%. The release behavior of BFS from the α-ZrP hydrogel was investigated under pH conditions of 2.0, 4.0 and 7.0. An increase in the amount of BFS released could be ...
Source: Colloids and Interface Science Communications - November 23, 2018 Category: Nanotechnology Source Type: research

Performance of Freshly Generated Magnesium Hydroxide (FGMH) for Reactive Dye Removal
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Shiyu Liu, Bing Li, Peishi Qi, Wei Yu, Jianhai Zhao, Yunzhi LiuAbstractCoagulation-flocculation (CF) is an essential process for water and wastewater treatment plants. Whilst compared with the conventional coagulants, the freshly generated magnesium hydroxide (FGMH) is environmental friendly within its coagulative and adsorptive jellied sediment. However, decoloration of dye wastewater using FGMH has not been well understood yet. In this paper, operating variables such as initial pH, coagulant dosage, agitation speed and...
Source: Colloids and Interface Science Communications - November 23, 2018 Category: Nanotechnology Source Type: research

Embedding CuO Nanoparticles in PDMS-SiO2 Coating to Improve Antibacterial Characteristic and Corrosion Resistance
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Shima Tavakoli, Shervin Nemati, Mahshid Kharaziha, Safoura Akbari-AlavijehAbstractThe purpose of this paper was to develop the hydrophobic nanocomposite coatings of polydimethylsiloxane (PDMS)-SiO2-CuO to improve biocompatibility, corrosion resistance and antibacterial property of 316 L stainless. In this research, after synthesize of CuO and SiO2 nanopowders using wet-chemical approaches, PDMS-SiO2-CuO coatings consisting of various amounts of CuO nanoparticles were developed using dip-coating process. The nanocomposi...
Source: Colloids and Interface Science Communications - November 17, 2018 Category: Nanotechnology Source Type: research

Thermal Denaturation and γ-Irradiation effects on the Crack Patterns of Bovine Serum Albumin (BSA) Dry Droplets
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Raquel C. de Oliveira, Clayton A. Benevides, George C.P. Rodrigues, Rômulo P. TenórioGraphical Abstract (Source: Colloids and Interface Science Communications)
Source: Colloids and Interface Science Communications - November 16, 2018 Category: Nanotechnology Source Type: research

IN VITRO Anticancer Activity and Physicochemical Properties of SOLANUM LYCOCARPUM Alkaloidic Extract Loaded in Natural Lipid-Based Nanoparticles
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): I.P.S. Carvalho, M.A. Miranda, L.B. Silva, T.N. Chrysostomo-Massaro, J.A.R. Paschoal, J.K. Bastos, P.D. MarcatoAbstractBladder cancer (BC) is the 9th most common cancer in the worldwide. BC's treatment is still a challenging goal. Thereby, the screening of natural compounds as solasonine (SS) and solamargine (SM) that exhibit antitumor activity is interesting to BC therapy. This work aimed to develop natural lipid-based nanoparticles (NLN) as carrier system of S. lycocarpum's fruits alkaloidic extract (AE), rich in SS an...
Source: Colloids and Interface Science Communications - November 14, 2018 Category: Nanotechnology Source Type: research

Continuous Flow Synthesis of Superparamagnetic Nanoparticles in Reverse Miniemulsion Systems
Publication date: January 2019Source: Colloid and Interface Science Communications, Volume 28Author(s): Tonghan Gu, Yunfei Zhang, Saif A. Khan, T. Alan HattonAbstractMagnetic nanoparticles were synthesized continuously in a multiphase segmented flow reaction system where one phase was a miniemulsion containing iron precursor solution in nanodroplet confinement and the other phase was diluted ammonium hydroxide solution. Spontaneous formation of reverse micelles at the phase boundary effectively transported ammonium hydroxide into the nanodroplets to trigger the precipitation of magnetic nanoparticles. The nanoparticles pos...
Source: Colloids and Interface Science Communications - November 7, 2018 Category: Nanotechnology Source Type: research

Design of antiretroviral drug-polymeric nanoparticles laden buccal films for chronic HIV therapy in paediatrics
Publication date: November 2018Source: Colloid and Interface Science Communications, Volume 27Author(s): R. Sneha, B.N. Vedha Hari, D. Ramya DeviAbstractAnti-HIV drug Lamivudine exhibit shorter half-life (2 h) and poor bioavailability (62% in paediatric patients), multiple dosing is required. To overcome the limitations, nanoparticles loaded buccal film was developed for prolonged drug release and improved efficiency. Nanoprecipitated Lamivudine-Eudragit E100 polymeric nanoparticles exhibited average particle size of 338 nm with polydispersity index 0.315. Buccal films prepared by solvent casting technique using sodium...
Source: Colloids and Interface Science Communications - November 3, 2018 Category: Nanotechnology Source Type: research

Intentionally Added Ionic Surfactants Induce Jones-Ray Effect at Air-Water Interface
Publication date: November 2018Source: Colloid and Interface Science Communications, Volume 27Author(s): Yuki Uematsu, Kengo Chida, Hiroki MatsubaraAbstractThe Jones-Ray effect is an anomalous minimum in the surface tension of aqueous electrolytes at millimolar salt concentrations. We experimentally demonstrated that intentionally added ionic surfactants induce the Jones-Ray effect. The one-dimensional Poisson-Boltzmann theory, including the effect of surfactant adsorption and salt depletion, excellently agrees with the obtained experimental data. All the parameters of the ion-specific surface affinities used in the theory...
Source: Colloids and Interface Science Communications - October 19, 2018 Category: Nanotechnology Source Type: research