Effects of Crude Oil Composition on the ASP Flooding: A Case from Saertu, Xingshugang and Lamadian Oilfield in Daqing
Publication date: Available online 17 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Zhe Sun, Xiaodong Kang, Xiangguo Lu, Qiang Li, Weidong JiangAbstractIn order to evaluate reservoir adaptability of the ASP (alkali/surfactant/polymer) system, its field tests have been carried out in Saertu, Xingshugang and Lamadian Oilfield of Daqing. The results show that crude oil compositions have a great effect on the agent concentration in produced liquid and oil recovery increment. Therefore, this paper researches crude oil composition of three oilfields in Daqing, and the interaction bet...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 18, 2018 Category: Chemistry Source Type: research

Effect evaluation of ethylene vinyl acetate/nano-montmorillonite pour-point depressant on improving the flow properties of model oil
Publication date: 20 October 2018Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 555Author(s): Na Li, GuoLiang Mao, Wei Wu, Yang LiuAbstractA series of novel nano-hybrid pour-point depressants (PPDs) which combined nano-montmorillonite (MMT) and ethylene vinyl acetate (EVA) copolymers were prepared. Compared with pure EVA PPDs with identical content, the effects of EVA/nano-MMT PPDs on the cold flow properties of 25 wt% wax model oil were evaluated. Polarized optical microscopy was used to study the effect of the EVA/nano-MMT PPDs on the crystallization behavior and crystal morphology of ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 14, 2018 Category: Chemistry Source Type: research

Characterization of the Aggregated Pattern of CHAPS Using Solvent Paramagnetic Relaxation Enhancements
Publication date: Available online 10 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Liang Zhang, Xin Chai, Peng Sun, Qinjun Zhu, Xu Zhang, Maili LiuAbstractCHAPS is a typical zwitterionic detergent widely used in protein purification. It has two peculiar aggregation states, whose aggregation patterns are still controversial and uncertain. In this paper, we analyzed the aggregation pattern of CHAPS by 1H solvent Paramagnetic Relaxation Enhancement (sPRE) experiment. It was found that the 1H sPREs of head groups of CHAPS are much smaller than those of the tail groups, and all of ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

A New Type of Activated Carbon Fibre Supported Titanate Nanotubes for High-Capacity Adsorption and Degradation of Methylene Blue
Publication date: Available online 10 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Qingrong Wang, Xiaoman Lei, Fei Pan, Dongsheng Xia, Yuji Shang, Weiliang Sun, Wen LiuABSTRACTA novel composite material which is referred to as activated carbon fibre supported titanate nanotubes (TNTs@ACF) was used for the removal of methylene blue (MB) from water through the combined adsorption and photocatalysis. TNTs@ACF was synthesized through a one-step hydrothermal method, which was composed of the activated carbon fibre as the skeleton and supported titanate nanotubes. TNTs@ACF showed a ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

The transport of metal ions in hydrogels containing humic acids as active complexation agent
Publication date: Available online 15 March 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Martina Klučáková, Michal Kalina, Jiří Smilek, Marcela LaštůvkováAbstractThe complexation and transport/immobilization abilities of humic acids are the most important environmental qualities of these substances. Therefore, the study of these properties is important for understanding their role both in natural systems and in human-driven applications. This contribution is focused on the diffusion of metal ions (Co, Cu and Ni) studied by means of a diffusion ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Fourier-transform infrared and Raman characterization of bilayer membranes of the phospholipid SOPC and its mixtures with cholesterol
Publication date: Available online 25 April 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Julia Genova, Minko Petrov, Isak Bivas, Peter Rafailov, Haritun Naradikian, Boyko KatranchevAbstractOne of the primary roles of cholesterol (Chol) in the biological cell is to modulate the physical properties of the bilayer phospholipid membrane. Moreover, the effect of cholesterol on lipid bilayers is strongly dependent on the concentration, hence it can easily adapt to the changes in the cell temperature. Incorporation of cholesterol in membranes induces diverse changes in the bilayer propert...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Preparation of oil-in-water nanoemulsions at large-scale using premix membrane emulsification and Shirasu Porous Glass (SPG) membranes
In this study, a process involving moderate pressure in the range 10–60 bar was proposed as an alternative, in particular for the encapsulation of sensitive actives or applications that require a precise droplet size control. Oil-in-water (O/W) nanoemulsions were prepared by premix membrane emulsification (PME) using a set-up with a controlled high pressure syringe pump and 125 mm long SPG membrane. A coarse emulsion (premix) was injected through the membrane with pore size between 0.2 and 0.8 μm in order to reduce and homogenize the droplet size. The effect of several parameters was investigated: process pa...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Cucurbit[n]urils (n = 6–8) used as host molecules on supramolecular complexes formed with two different drugs: Emodin and indomethacin
We present the characterization of supramolecular complexes formed by cucurbit[n]urils, (n = 6,7,8) with the anti-tumoral drug emodin and the non-steroidal anti-inflammatory drug indomethacin at several pHs. Both drugs exhibit poor water solubility and host-guest complexes constitute an option to increase the drugs’ solubility and stability. We use different spectroscopic techniques: UV–vis, 1H NMR and fluorescence. Our study shows that emodin forms complexes at pH = 2 with cucurbit[6]uril with stoichiometry (1:1) (host:guest), as well as complexes with cucurbit[7]uril and cucurbit[8]uril with stoichiom...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Pyrrolidinium and morpholinium ionic liquids as a novel effective destabilising agent of mineral suspension
Publication date: Available online 4 May 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Anna Bastrzyk, Joanna Feder-KubisAbstractHere we describe ionic liquids (ILs) with an octyloxymethyl substituent in the cation designed and prepared using cheap and reactive cyclic tertiary amine: 1-methylpyrrolidine and 4-methylmorphine. The synthesis rout was described, especially Menschutkin reaction. The physicochemical characteristics of the obtained pyrrolidinium and morpholinium chlorides were examined. The effect of the type of the amine present in the cation on the physicochemical propert...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Sucrose solutions alter the electric capacitance and dielectric permittivity of lipid bilayers
Publication date: Available online 5 May 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Victoria Vitkova, Denitsa Mitkova, Krassimira Antonova, George Popkirov, Rumiana DimovaAbstractUnderstanding sugar-membrane interactions is of fundamental and technological relevance considering the role of sugars in drought-protection mechanisms of plants as well as the cryo- and bio-preserving effect of carbohydrates in many industrial and medical applications. In this work, we investigated the effect of sucrose on the electrical properties of membranes. In particular, we measured the specific c...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

A Comment on “Insight into the Behavior of Colloidal Gas Aphron (CGA) Fluids at Elevated Pressures: An Experimental Study”
Publication date: Available online 18 May 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Rohallah Hashemi, M.C. Amiri (Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects)
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Gold nanorods as SERS substrate for the ultratrace detection of cocaine in non-pretreated oral fluid samples
Publication date: Available online 26 May 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Valentina D’Elia, Jorge Rubio-Retama, Fernando E. Ortega-Ojeda, Carmen García-Ruiz, Gemma MontalvoAbstractThis work shows the capability of surface-enhanced Raman spectroscopy (SERS) to detect ultratraces of cocaine (COC) in oral fluid (OF). It proposes a new solid substrate made of gold nanorods (Au NRs) to perform sensitive analyses of this complex matrix without any sample pretreatment. The Au NRs were synthetized optimizing the synthesis conditions, and then characterized and tes...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Encapsulation of camptothecin into pegylated polyelectrolyte nanocarriers
In this study, pegylated polyelectrolyte nanocapsules were utilized to prepare camptothecin nanocarriers. Nanosize droplets containing the camptothecin were encapsulated in polyelectrolyte multilayer shells formed by sequential adsorption of polyelectrolytes technique. The nanocapsules were pegylated for passive targeting through the adsorption of the pegylated polyelectrolyte. The biological effects of encapsulated camptothecin on two tumor cell lines: mouse colon carcinoma cell line CT26-CEA and the mouse mammary carcinoma cell line 4T1 were studied. Obtained results suggest, that encapsulated drug, as well as free one, ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Atherogenesis and plaque rupture, surface/interface-related phenomena
Publication date: Available online 1 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): G. Siegel, J. Berkholz, D. Klüßendorf, C. Knosalla, A. Zakrzewicz, E. Ermilov, M. Malmsten, B. LindmanAbstractIn atherogenesis, free oxygen radicals cause a lipid peroxidation of apoB100-containing lipoproteins in the blood, at the blood–endothelium-interface and in the subendothelial space. These lipoproteins easily aggregate, bind to their receptor heparan sulfate proteoglycan and calcify to arteriosclerotic nanoplaques (ternary complexes). Nanoplaque formation was measured by ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Fast liquid sheet and filament dynamics in the fluid splitting process
Publication date: Available online 1 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Hans Martin Sauer, Ilia V. Roisman, Edgar Dörsam, Cameron TropeaAbstractWe consider the fluid splitting dynamics of a small fluid drop entrapped between two parallel solid plates, which are rapidly pulled apart such that a free liquid sheet is formed between them for a few milliseconds. Velocities, time scales and shear rates correspond to the lift-off of a printing cylinder from the substrate in an industrial printing process.The formation and collapse of the liquid sheets, and the filament...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

PTA-based ruthenium complexes as photosensitizers for dye-sensitized solar cells
Publication date: Available online 4 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Benjamin Sierra-Martin, Ana Maldonado-Valdivia, Manuel Serrano-Ruiz, Antonio Romerosa, Antonio Fernandez-BarberoAbstractTwo novel ruthenium complexes are synthesized, photo-characterized and tested as photosensitizers in dye-sensitized solar cells (DSCs): [RuCl2(mPTA)3(H2O)](CF3SO3)3 (C1) (m: methyl; PTA: 3,5,7-triaza-phosphaadamantane) and [Ru(C = C=CPh2)Cp(PTA)(PPh3)](CF3SO3) (C2). The complexes are soluble in organic solvents and, interestingly, in water, which makes them useful for water-...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

High internal vegetable oil nanoemulsion: D-phase emulsification as a unique low energy process
Publication date: Available online 12 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Megumi Nishitani Yukuyama, Pedro Leonidas Oseliero Filho, Edna Tomiko Myiake Kato, Raimar Lobënberg, Cristiano Luis Pinto de Oliveira, Gabriel Lima Barros de Araujo, Nadia Araci Bou-ChacraAbstractThe development of nanoscale emulsions containing high concentration of vegetable oil and low concentration of surfactant is considered challenging in conventional low-energy processes such as the Phase Inversion Temperature (PIT) and Phase Inversion Composition (PIC) methods. For the first time, a...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

The synthesis and characterization of AlPO4 hollow microspheres of uniform size, and the sorption properties for Pb2+, Cd2+, Cu2+, and Zn2+
Publication date: Available online 15 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Fuzhong Gong, Huameng Cai, Bin Zhou, Huilin OuAbstractWell-defined aluminum phosphate hollow microspheres (AlPO4-HMs) of uniform size were synthesized via homogeneous precipitation using polystyrene (PS) as the template. The as-prepared AlPO4-HMs were characterized by FESEM, TEM, XRD, FTIR and N2 adsorption/desorption. The adsorption of AlPO4-HMs towards Pb2+, Cd2+, Cu2+ and Zn2+ metal ions was also studied. The FESEM and TEM images show that the AlPO4-HMs display a regular spherical hollow stru...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Formation, properties and stability of silver nanoparticle monolayers at PDADMAC modified polystyrene microparticles
Publication date: Available online 15 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Dawid Lupa, Zbigniew Adamczyk, Magdalena Oćwieja, Dorota DuraczyńskaAbstractA facile self-assembly procedure was developed for the preparation of silver nanoparticle shells at polystyrene microparticles (PSMPs) modified by poly(diallyldimethylammonium chloride) (PDADMAC). Initially, physicochemical properties of microparticles, silver particles and (PDADMAC) were determined for various ionic strength and pHs. Then, PDADAMAC adsorption on the PSMPs was studied in situ via electrokinetic measure...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Noncovalent Grafting of Polyelectrolytes onto Hydrophobic Polymer Colloids with a Swelling Agent
Publication date: Available online 18 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Joohyung Lee, Goliath Beniah, Chola Bhargava Dandamudi, Jae Jin Han, Bonnie A. Lyon, Chasity A. Norton, Nicolas D. Huffman, Leah M. Johnson, Jeffrey B. Mecham, Ginger D. Rothrock, Nijia Zhou, Kurt D. Pennell, Keith P. JohnstonABSTRACTOften it is not feasible to graft hydrophilic polymer stabilizers covalently to polymer colloids as reactive binding sites are either not available or would interfere with the functional properties. Here, we present facile, general and scalable physical protocols fo...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Efficient preparation of cetyltrimethylammonium bromide-graphene oxide composite and its adsorption of Congo red from aqueous solutions
In this report, a facile method is proposed for the synthesis of a cetyltrimethylammonium bromide (CTAB)-GO composite via ionic interaction. The hydrophobicity of CTAB-GO composite is enhanced owing to the alkyl chains of CTAB, and thus, it can be readily separated from water-soluble impurities via low-speed centrifugation (3000 rpm for 3 min). The obtained CTAB-GO composite can efficiently remove the azo dye, Congo red from aqueous solutions, with an adsorption capacity as high as 2767 mg/g. Increasing the initial acidity of the solutions enhances the dye removal process. The adsorption kinetic studies reveal that t...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Analysis of Stability Behavior of Carbon Black Nanoparticles in Ecotoxicological Media: Hydrophobic and Steric Effects
Publication date: Available online 19 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Gukhwa Hwang, Allan Gomez-Flores, Scott A. Bradford, Sowon Choi, Eunhye Jo, Song Bae Kim, Meiping Tong, Hyunjung KimAbstractThe stability of carbon black nanoparticles (CB-NPs) was investigated in five different ecotoxicity test media for fish, daphnia, and algae (i.e., ISO Test water, Elendt M4 medium, OECD TG 201 medium, AAP medium, and Bold’s Basal Medium) in the presence and absence of Suwannee River Humic Acid (SRHA) as a function of time. Hydrodynamic size, particle sedimentation rat...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles
Publication date: Available online 20 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): A.V. Minakov, V.Ya. Rudyak, M.I. PryazhnikovAbstractThe paper presents the results of experimental study of rheological behavior of nanofluids based from consideration of several tens of nanofluids based on water, ethylene glycol and engine oil, containing particles of different oxides and diamond. The sizes of nanoparticles ranged from 5 to 150 nm, while their volume concentration ranged from 0.25 to 8%. At that, no dispersants were used when preparing tested nanofluids. It is shown that in s...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Wettability Assisted Selective Deposition of Polystyrene Nanoparticles on Glass Fibers
Publication date: Available online 23 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Seethalakshmi Chandramouli, Larissa Gorbatikh, David SevenoAbstractThis work presents a concept for creating different chemistries along thin, micrometer sized fibers to be used as substrates for selective localization of nanoparticles. Glass fibers have been surface modified to introduce hydrophilic and hydrophobic regions along their length. Dynamic contact angle measurements using the Wilhelmy technique shows a marked change in the wetting behavior, confirming the transition in chemical funct...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

CO2-Switchable Dispersion of a Natural Chitosan and its Application as a Responsive Pickering Emulsifier
Publication date: Available online 25 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Dongyin Ren, Shengming Xu, Dejun Sun, Qibao Wang, Zhenghe XuAbstractThe natural chitosan aggregates obtained by increasing pH are found to be responsive to CO2/N2 switching. These chitosan aggregates can be dispersed in water upon CO2 bubbling and precipitated out with N2 bubbling at room temperature. Liquid paraffin-in-oil Pickering emulsions are prepared using these aggregates as the stabilizer. These emulsions can be demulsified completely with CO2 bubbling, and the separated two phases can b...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Evaluation of siRNA and Cationic Liposomes Complexes as a Model for in vitro siRNA Delivery to Cancer Cells
This study aims to investigate the effect of different molar charge ratios (R+/-) between positive charges from microfluidics-produced cationic liposomes (CL) (egg phosphatidylcholine, 1,2-dioleoyl-3-trimethylammonium-propane and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine) and negative charges from siRNA and on physico-chemical and morphological properties of the lipoplexes (CL/siRNA) as well as their in vitro luciferase silencing effect in HeLa cells. R+/- 3.27 was found to be the optimum point for complexation. This finding was confirmed by gel retardation and siRNA accessibility assays. According to Cryo-TEM analysis...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

17th food colloids conference: “Application of soft matter concepts” April 8-11, 2018, University of Leeds, Leeds, UK
Publication date: Available online 28 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Anwesha Sarkar, Brent S. Murray (Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects)
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Synthesis of ZnO/activated carbon with high surface area for supercapacitor electrodes
Publication date: Available online 28 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Kwang Se Lee, Chan Woo Park, Jong-Duk KimAbstractThis research demonstrated that zinc oxide (ZnO) and activated carbon with specific surface areawere prepared and applied as supercapacitor electrodes. The composites of ZnO and activated carbon including Chlorella vulgaris and asphaltene were synthesized through in-situ reaction. Zinc precursor solution was mixed with activated carbon by precipitation method depending on the concentration and type of precursor.These composites were well grown on ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Peptide stabilized gold and silver nanoparticles derived from the mangrove isolate Pseudoalteromonas lipolytica mediate dye decolorization
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Rasika Kulkarni, Shubham Harip, Ameeta Ravi Kumar, Deepti Deobagkar, Smita ZinjardeABSTRACTA mangrove associated halotolerant bacterium identified as Pseudoalteromonas lipolytica mediated the synthesis of gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs). Interaction of P. lipolytica cells with chloroauric acid (HAuCl4) resulted in the synthesis of cell associated AuNPs that could be released in an extracellular manner after sonication. For obtaining extracellular AgNPs, pre-grown cell...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Surface Characterization of Microwave-treated Chalcopyrite
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): G.R. da Silva, E.R.L. Espiritu, S. Mohammadi-Jam, K.E. WatersAbstractThe application of microwave radiation as an assisted grinding technique has shown great potential to improve comminution. Besides fracturing, the treatment also leads to phase transformations at the grain boundaries of the minerals, changing their surface properties and affecting downstream processes, such as flotation. Therefore, the study of the effects of microwave treatment on a mineral’s surface properties is import...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Interfacial and emulsifying properties of chitosan/sodium lauryl ether sulfate system
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Jelena Milinković, Lidija Petrović, Jadranka Fraj, Sandra Bučko, Jaroslav Katona, Ljiljana SpasojevićAbstractMany pharmaceutical, cosmetic and chemical products exist in form of emulsions. A common problem with emulsions is their instability. Interaction between polymer and surfactant could change the adsorption layer around the oil droplets in emulsion which affects their stability. In order to understand the stabilization mechanism, the interface of oil/water systems that contained mixture...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Micro-Lithography on Paper, Surface Process Modifications for Biomedical Performance Enhancement
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Babak Kamali, Sasan Asiaei, Borhan Beigzadeh, Amir Ali EbadiAbstractWe have enhanced the performance of lithographically patterned microchannels on paper and tailored it to a do it yourself method by examining the impact of each microfabrication step on surface properties. Modification of photoresist spreading, baking, exposure and developing steps improved paper and channels quality and decreased fabrication costs and time. The proper concentration of SU-8 in cyclopentene was found 1/8 (volumet...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Treatment of Wastewater Containing Cu2+ Using a Novel Macromolecular Heavy Metal Chelating Flocculant Xanthated Chitosan
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Kai Yang, Gang Wang, Xuemin Chen, Xin Wang, Fulong LiuAbstractA novel macromolecular heavy metal chelating flocculant, xanthated chitosan (XCTS), was prepared by reacting chitosan with benzaldehyde, NaOH and CS2. In a series of experiments, the flocculation performance of XCTS was evaluated by testing the removal rate of Cu2+ and/or turbidity. Factors that could affect the process such as pH, initial Cu2+ concentration, co-existing organic complexing agents and turbidity were studied. The result...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Effect Evaluation of Ethylene Vinyl Acetate /Nano-montmorillonite Pour-point Depressant on Improving the Flow Properties of Model Oil
Publication date: Available online 30 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Na Li, GuoLiang Mao, Wei Wu, Yang LiuABSTRACTA series of novel nano-hybrid pour-point depressants (PPDs) which combined nano-montmorillonite (MMT) and ethylene vinyl acetate (EVA) copolymers were prepared. Compared with pure EVA PPDs with identical content, the effects of EVA/nano-MMT PPDs on the cold flow properties of 25 wt % wax model oil were evaluated. Polarized optical microscopy was used to study the effect of the EVA/nano-MMT PPDs on the crystallization behavior and crystal morphology ...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Physicochemical study of the interactions between Econazole and DL-α-Tocopherol with triblock copolymer aggregates in PBS media.
Publication date: Available online 3 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): María Luisa Rodríguez-Loya, Xelhua Marcos, Silvia Pérez-Casas, Ernesto Carrillo-NavaAbstractSolubilization enhancement of the pharmaceutical drug Econazole and vitamin E (DL-α-Tocopherol) in phosphate buffered saline aqueous media (PBS) at 298.15 K, due to the presence of aggregates of two triblock copolymers (F127 and P123), is reported. The increment in the solubility of the compounds as a function of the concentration of the triblock copolymer was determined by UV-Vi...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

AFM study of adhesion and interactions between polyelectrolyte bilayers assembly
In this report we present the influence of the first polyelectrolyte layer and the number of subsequent bilayers on physicochemical interactions and adhesion forces in polyelectrolyte multilayers (PEM) composed of poly(ethyleneimine) (PEI) and poly(styrene sulfonate) (PSS) deposited by layer-by-layer (LbL) technique on gold substrate. Morphology, thickness and adhesive properties of polyelectrolyte multilayers were studied by the means of AFM imaging and force spectroscopy methods, in relation to the number of deposited layers and polyelectrolyte deposition order. Thickness growth was quicker for PEI/PSS comparing to PSS/P...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Dynamic contact angle hysteresis in liquid bridges
Publication date: Available online 6 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Zhang Shi, Yi Zhang, Mingchao Liu, Dorian A.H. Hanaor, Yixiang GanAbstractThis work presents an experimental study of dynamic contact angle hysteresis using liquid bridges under cyclic compression and stretching between two identical plates. Under various loading rates, contact angle hysteresis for three different liquids was measured by examination of advancing and receding liquid bridges, and the capillary forces were recorded. It is found that for a given liquid, the hysteretic behaviour of th...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Deterministic role of frequency, amplitude and concentration regimes on the complex dielectric relaxation of colloidal complex fluids
Publication date: Available online 6 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Ankur Chattopadhyay, Purbarun DharAbstractThe present article explores the governing roles played by concentration regimes, frequency and amplitude of the forcing electric field on the dynamic dielectric responses of nanocolloidal non-polar suspensions. Frequency dependent complex dielectric constants were determined in the band of 1 to 107 Hz at constant temperature via dielectric spectroscopy. In addition to prevalant literature measurements, influence of field amplitude has also been performed...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Scalable superhydrophobic coating with controllable wettability and investigations of its drag reduction
In this study, steel surface was sprayed with suspension that contained PMMA and hydrophobic nanoscale silica, and the obtained surface showed variable contact angle from 94° to 159°, sliding angle from 90° to 2°, suggesting the controllable wettability; besides, the facile preparation process showed promising prospect to be scaled up. We studied the drag-reducing property of treated steel via sailing test and rotary disc test, results showed that SHS could efficiently reduce the drag force under low fluidic condition; surprisingly, for the intense turbulent flow, the SHS exhibited a drag-increasing effect,...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Effect of a Novel Clay/silica Nanocomposite on Water-Based Drilling Fluids: Improvements in Rheological and Filtration Properties
Publication date: Available online 7 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Goshtasp Cheraghian, Qinglin Wu, Masood Mostofi, Mei-Chun Li, Masoud Afrand, Jitendra S.SangwaiAbstractDrilling fluid is one of the most important components of drilling operation in oil and gas, mining and geothermal industries. Nanotechnology can be used to develop drilling fluid additives that can improve the drilling fluid properties. In this work, the feasibility of using two types of nanoparticle additives in water-based drilling fluid has been investigated. Clay/SiO2 nanocomposite was synt...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Study of Selective Sensing of Hg2+ ions by Green Synthesized Silver Nanoparticles Suppressing the Effect of Fe3+ ions
Publication date: Available online 8 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Santu Ghosh, Samir Maji, Avijit MondalAbstractIn this present study, we eliminate the strong interference effect of Fe3+ ions commonly observed in silver nanoparticles (AgNPs) based selective detection of toxic metal ions by localized surface plasmon resonances (LSPRs) of AgNPs. The photo induced green crystalline silver nanoparticles (NPs) are synthesized using Allium sativum (garlic) extract. The bio ligands act as reducing as well as stabilizing agents and presence of ambient light source enha...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Low-temperature synthesis of flower-like ZnO microstructures supported on TiO2 thin films as efficient antifungal coatings for bamboo protection under dark conditions
Publication date: Available online 9 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Danjing Ren, Jingpeng Li, Yongjie Bao, Zaixing Wu, Sheng He, Anke Wang, Fan Guo, Yuhe ChenAbstractBamboo is readily infected with fungi because of its abundant sugar, starch and protein content, which greatly restricts its utilization. To develop a highly effective environmentally sound antifungal agent for bamboo, flower-like ZnO microstructures supported on TiO2 thin films have been synthesized on bamboo surfaces by a facile two-step low-temperature hydrothermal method. According to the results...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

High-efficient adsorption of phosphates from water by hierarchical CuAl/Biomass Carbon fiber layered double hydroxide
Publication date: Available online 9 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Fengping Hu, Min Wang, Xiaoming Peng, Fengxian Qiu, Tao Zhang, Hongling Dai, Zhanmeng Liu, Zan CaoAbstractPhosphorus-contaminated wastewater is one of the main reasons for eutrophication. In this work, a hierarchical CuAl/Biomass Carbon fiber layered double hydroxide was synthesized successfully and applied to phosphates adsorption in simulated wastewater. The morphologies and structures of composites were characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emme...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Ag-coated submicron particles of polystyrene formed by dewetting process and their application in multi-functional biosensor-chips
Publication date: Available online 9 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Marie Taguchi, Tasuku Ogami, Jun Ando, Takashi Fukuda, Akira EmotoAbstractThe formation of Submicron polystyrene (PS) particles based on dewetting process during spin-coating was investigated. The surface morphologies on glass substrates were analyzed. The formation of particles was achieved using PS with relatively high molecular weight (Mw ≥ 3250). In addition, it was observed that the particle formation proceeded through sequential morphological changes in the order of initial wet thin film...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Inhibition of Fine Particles Fugitive Emission from the Open-Pit Lignite Mines by Polymer Aqueous Solutions
Publication date: Available online 9 July 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Lei Zhou, Shuying Yang, Zhulin Yuan, Linjun Yang, Hao WuAbstractTo reduce the fugitive emission of fine particles from the open-pit lignite mines, a dust suppressant was proposed by applying a blend of 0.7% water-soluble polymer (guar gum) and 0.1% nonionic surfactant (Triton X-100) in this paper. The characteristics of the polymer protection film formed on the lignite sample's surface, as well as the wetting performances of surfactants on lignite were investigated, and the simulated dust suppres...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Effects of n-hexadecane on sphericity of poly-α-methylstyrene shells
Publication date: 5 October 2018Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 554Author(s): Qiang Chen, MeiFang Liu, DaWei Pan, SuFen Chen, Ruiting Shi, XiaoBo Qi, Zhanwen Zhang, Bo LiAbstractMillimeter-scale polymer shells with stringent specifications such as sphericity, wall thickness uniformity and surface finish are needed in inertial confinement fusion (ICF) experiment. In order to meet these stringent specifications, n-hexadecane (n-HD) is introduced in oil phase to improve the sphericity of poly-α-methylstyrene (PAMS) shells. The results show that n-HD decreases the survival...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Chitosan–bleaching earth clay composite as an efficient adsorbent for carbon dioxide adsorption: Process optimization
This study suggests that Chi–BE is an effective and stable CO2 adsorbent under moderate environment.Graphical abstract (Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects)
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Microscopic and physicochemical studies of polymer-modified kaolinite suspensions
Publication date: 5 October 2018Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 554Author(s): J. Cao, X. Kang, B. BateAbstractSedimentation tests on kaolinite in biopolymers (xanthan gum, chitosan, polyacrylic acid and polyacrylamide) solutions were conducted and recorded with time-lapsed technique up to 35 days. Microscopic particle size, zeta potential, final volume and solid content were measured along the elevation of the graduated cylinder at the end of tests, and settling velocity and intensity calculated. Test results suggested that positive charged edges of kaolinite particles attac...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Graphene oxide functionalized O-(carboxymethyl)-chitosan membranes: Fabrication using dialysis and applications in water purification
Publication date: 5 October 2018Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 554Author(s): Qian Huang, Guihua Li, Mengjun Chen, Shuli DongAbstractThe membranes of O-(carboxymethyl)-chitosan (O-CMC), O-CMC-graphene oxide (GO) and O-CMC-reduced graphene oxide (rGO) are prepared by dialysis method, respectively. The membrane structures and properties are investigated with different techniques. Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) spectra indicate that the composition (O-CMC) of the membranes is protonated. The mechanical strength of these membranes is enhanced with...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research

Effect of Fenton-like oxidation reagent on hydrophobicity and floatability of chalcopyrite and molybdenite
Publication date: 5 October 2018Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 554Author(s): Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji ImaizumiAbstractA fundamental study is provided in this work to understand the effect of Fenton-like reagent made by the addition of FeSO4 in H2O2 aqueous solution on surface hydrophobicity and floatability of chalcopyrite (CuFeS2) and molybdenite (MoS2). Contact angle measurements were performed to assess the surface hydrophobicity. The contact angle results showed that Fento...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research