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Journal of Colloid and Interface Science

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https://www.readbyqxmd.com/read/28743030/reactive-ceo2-nanofluids-for-uv-protective-films
#1
Rafael Maniglia, Kenneth J Reed, John Texter
We investigate surface modification by organo-trimethoxysilanes of nano-ceria and if such surface-modified nano-ceria can be transformed into solvent-free nanofluids. We also examine whether simultaneous modification with ionic liquid salts and with acrylate groups yields nanofluids suitable for forming UV-protective films and clear coatings by UV-initiated polymerization. Nominally 3nm diameter CeO2 was successfully synthesized and surface decorated with an ionic liquid salt and with acrylate groups to produce a core/shell structured solvent-free nanofluid after ion exchange of chloride for a soft polyoxyethylene sulfonate anion...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28743028/enhanced-photo-electrochemical-response-of-reduced-graphene-oxide-and-c3n4-nanosheets-for-rutin-detection
#2
Jin Wang, Beibei Yang, Shumin Li, Bo Yan, Hui Xu, Ke Zhang, Yuting Shi, Chunyang Zhai, Yukou Du
Herein, a sensitive photo-electrochemical sensor based on C3N4 and reduced graphene oxide nanosheets modified glassy carbon electrode (C3N4-RGO/GCE) has been fabricated for the detection of rutin under UV light illumination. In C3N4-RGO catalyst, RGO not only works as a template but also promotes electron transfer, meanwhile, C3N4 acts as a photocatalyst. Benefiting from the superior electron transfer capacity and efficient UV light effect of the C3N4-RGO catalyst, we get a photo-electrochemical sensor for the rutin detecting with a low detection limit of 1...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738280/cobalt-fibers-anchored-with-tin-disulfide-nanosheets-as-high-performance-anode-materials-for-lithium-ion-batteries
#3
Xuefang Chen, Ying Huang, Kaichuang Zhang, Weichao Zhang
Well-designed hierarchical nanostructured composites consisting of one dimensional cobalt fibers and thin tin disulfide nanosheets were successfully synthesized for the first time through a hydrothermal method. The SnS2 nanosheets were uniformly grown onto the Co fibers and were almost perpendicular to the Co fibers. The composites as one kind anode materials exhibited more remarkable lithium ion storage properties than SnS2 nanosheets. The composites exhibited a capacity of 500.5mAh/g after 100 cycles even at 1000mA/g...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738278/well-dispersed-rhenium-nanoparticles-on-three-dimensional-carbon-nanostructures-efficient-catalysts-for-the-reduction-of-aromatic-nitro-compounds
#4
Pitchaimani Veerakumar, Pounraj Thanasekaran, King-Chuen Lin, Shang-Bin Liu
Rhenium nanoparticles (ReNPs) supported on ordered mesoporous carbon (OMC) as a catalyst (Re/OMC) through a solvent-evaporation induced self-assembly (ELSA) method were prepared. The synthesized heterogonous catalyst was fully characterized using X-ray diffraction, field emission transmission electron microscopy, N2 sorption, metal dispersion, thermogravimetric analysis, Raman, Fourier-transform infrared, and X-ray photon spectroscopies. In addition, the catalyst was applied to reduce the aromatic nitro compounds (ANCs) for the first time in aqueous media and the reactions were monitored by following the intensity changes in the UV-vis absorption spectra with respect to time...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28743029/thermoresponsive-nanoparticle-agglomeration-aggregation-in-salt-solutions-dependence-on-graft-density
#5
Thaddeus W Vasicek, Samir V Jenkins, Leticia Vaz, Jingyi Chen, Julie A Stenken
Gold nanoparticles with a graft density of 0.09, 0.30 and 0.40chains/nm(2) of poly(N-isopropylacrylamide) were reproducibly synthesized by varying the ratio of disulfide terminated poly(N-isopropylacrylamide) to gold nanoparticle. The polymer coated nanoparticles were stable at room temperature in 50mM NaCl, yet agglomerated at 37°C. Previous studies have observed conflicting results as to the reversibility of this agglomeration. Particle agglomeration with three different graft densities was studied in 50mM NaCl by measurements of their localized surface plasmon resonance and hydrodynamic diameter, and imaging with electron microscopy...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738281/edta-functionalized-fe3o4-graphene-oxide-for-efficient-removal-of-u-vi-from-aqueous-solutions
#6
Donglin Zhao, Qi Zhang, Han Xuan, Yan Chen, Kehua Zhang, Shaojie Feng, Ahmed Alsaedi, Tasawar Hayat, Changlun Chen
In this study, a regenerable magnetic ligand material (EDTA-mGO) was fabricated by binding chelating groups (EDTA) onto Fe3O4/graphene oxide and applied to remove U(VI) from aqueous solution. The sorption experiments were investigated under different experimental conditions, such as temperature, contact time and pH. EDTA-mGO showed fast removal capacity for U(VI) (<1.5h) with high sorption ability (277.43mg/g). The removal mechanisms mainly attributed to the metal-binding organic ligand (EDTA) and the electrostatic attractions between U(VI) and oxygenic functional groups...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738279/development-and-modification-of-conventional-ouali-model-for-tensile-modulus-of-polymer-carbon-nanotubes-nanocomposites-assuming-the-roles-of-dispersed-and-networked-nanoparticles-and-surrounding-interphases
#7
Yasser Zare, Kyong Yop Rhee
In this paper, conventional Ouali model for tensile modulus of composites is developed for polymer/carbon nanotubes (CNT) nanocomposites (PCNT) assuming the influences of filler network and dispersed nanoparticles above percolation threshold as well as the interphases between polymer host and nanoparticles which reinforce the nanocomposite and facilitate the networking. The developed model is simplified, because the characteristics of dispersed nanoparticles and surrounding interphase cannot significantly change the modulus of PCNT...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735198/impact-of-carbon-quantum-dots-on-dynamic-properties-of-bsa-and-bsa-dppc-adsorption-layers
#8
Lu Lai, Xiao-Qian Wei, Wei-Hua Huang, Ping Mei, Zhao-Hua Ren, Yi Liu
The effects of carbon quantum dots (CQDs) on the dynamic properties of bovine serum albumin (BSA) were investigated using pendant drop profile analysis method. Moreover, the effects of CQDs on the competitive adsorption of BSA and dipalmitoyl phosphatidylcholine (DPPC) were examined. CQDs reduce the fluorescence intensity of BSA and cause a red shift in fluorescence emission. The quenching constant at pH 4.3 is almost twice as large as that of the value obtained at pH 6.0. A small amount of CQDs does not influence the dynamic surface adsorption properties of BSA molecules...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735197/synthesis-of-porous-polymer-based-solid-amine-adsorbent-effect-of-pore-size-and-amine-loading-on-co2-adsorption
#9
Fenglei Liu, Shuixia Chen, Yanting Gao
A series of porous polymers was synthesized by a suspension polymerization of divinylbenzene (DVB) and ethylene glycol dimethyl acrylate (EGDMA), which was further functionalized with polyethyleneimine (PEI) for CO2 capture. The results showed that the synthesized DVB and EGDMA (DE) copolymers were an effective support for loading PEI because of its larger pore size and specific surfaces area. It was found that DE (30, 10) loaded with 30wt% PEI exhibited a higher CO2 adsorption amount of 3.28mmol/g at 25°C under dry condition...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735191/newly-designed-diblock-dispersant-for-powder-stabilization-in-water-based-suspensions
#10
Chia-Chen Li, Shinn-Jen Chang, Chi-Wei Wu, Cha-Wen Chang, Ruo-Han Yu
A newly designed dispersant for water-based suspensions, ammonium poly(methacrylate)-block-poly(2-phenoxyethyl acrylate) (PMA-b-PBEA), is proposed in this study. According to the results of rheological analysis, the dispersion efficiency of this new dispersant is superior to that of the commercially available ammonium polyacrylate (PAA-NH4). The diblock structure of PMA-b-PBEA, which simultaneously contains a low-polar anchoring head group and a water-dissociable stabilizing moiety, is the main cause for its extremely high efficiency for powder dispersion...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738282/fouling-behavior-of-silica-nanoparticle-surfactant-mixtures-during-constant-flux-dead-end-ultrafiltration
#11
Krzysztof W Trzaskus, Sooi Li Lee, Wiebe M de Vos, Antoine Kemperman, Kitty Nijmeijer
The increasing use of engineered nanoparticles in customer products results in their accumulation in water sources. In this experimental study, we investigated the role of surfactant type (cationic, anionic and non-ionic) and concentration on fouling development, nanoparticle rejection and fouling irreversibility during dead-end ultrafiltration of model silica nanoparticles. Our work demonstrates that the type of surfactant influences the nanoparticle stability, which in turn is responsible for differences in fouling behavior of the nanoparticles...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735199/one-pot-synthesis-of-bismuth-silicate-heterostructures-with-tunable-morphology-and-excellent-visible-light-photodegradation-performances
#12
Kun-Le Jia, Jin Qu, Shu-Meng Hao, Fei An, Ya-Qiong Jing, Zhong-Zhen Yu
Construction of a heterostructure to prolong the life of electron-hole pairs is a very important approach to endow it with excellent photodegradation performances. Particularly, one-pot synthesis of heterostructures with the same component but different crystal structures to form a proper band gap is still challenging. Herein, bismuth silicate (BSO) heterostructures are synthesized using a one-pot hydrothermal approach without adding any other inorganic components. The crystal phase, morphology, surface state, and photochemical properties of the BSO materials are precisely tuned to fabricate two kinds of bismuth silicate heterostructures: rod-like Bi2SiO5/Bi12SiO20 and flower-like Bi2SiO5/Bi4Si3O12 heterostructures...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735196/molecular-dynamics-simulation-of-sodium-dodecylsulfate-sds-bilayers
#13
Hongshu Zhang, Shiling Yuan, Jichao Sun, Jianqiang Liu, Haiping Li, Na Du, Wanguo Hou
Sodium dodecylsulfate (SDS) - a simple single tailed surfactant (STS) can form stable vesicles from its micellar solution without any additives under the mediation of solid surfaces. To further understand the mechanism of this transition on the molecular level, molecular dynamics simulations are performed to study segments of SDS bilayers (as part of vesicles) in the bulk solution systematically, at the moment that the lower leaflet of bilayers already detached from solid surfaces. The SDS membrane would rather keep their bilayers structure than return to micelles when the initial interdigitated degree (δi) between alkyl chains is more than 8...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735200/ion-specific-hydration-in-nano-confined-electrical-double-layers
#14
Z Zachariah, R M Espinosa-Marzal, M P Heuberger
We probe counter-ion specific effects in nano-confined electrical-double-layers (EDLs) by means of direct force measurements across a model slit pore in the extended surface forces apparatus. By variation of solution composition, we compare four different counter-ions with dissimilar hydration properties, namely Na(+), K(+), Cs(+) as well as H3O(+), all confined between (001) mica surfaces. We discuss the results in terms of a recently proposed π-transition model, evoking hydrated ion layering as the recurrent structural element in highly confined EDLs...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735192/nozzle-jet-printed-flexible-field-effect-transistor-biosensor-for-high-performance-glucose-detection
#15
Kiesar Sideeq Bhat, Rafiq Ahmad, Jin-Young Yoo, Yoon-Bong Hahn
Printable electronics is a subject of great interest for low-cost, facile and environmentally-friendly large scale device production. But, it still remains challenging for printable biosensor development. Herein, we present the fabrication of nozzle-jet printed flexible field-effect transistor (FET) glucose biosensor. The silver source-drain electrodes and ZnO seed layers were printed on flexible substrate by nozzle-jet printer followed by ZnO nanorods (ZnO NRs) synthesis and glucose oxidase (GOx) immobilization...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735189/studies-on-the-role-of-unsaturation-in-the-fatty-acid-surfactant-molecule-on-the-thermal-conductivity-of-magnetite-nanofluids
#16
Ramanujam Lenin, Pattayil Alias Joy
To study the role of unsaturation in the surfactant molecule on the thermal conductivity of magnetite nanofluids, four different fatty acid (stearic, oleic, linoleic, and linolenic acids with different degree of unsaturation) coated magnetite nanoparticles of comparable size are prepared and dispersed in toluene. It is found that the nanofluid with the saturated fatty acid coated nanoparticles show larger viscosity than the fluid with the unsaturated fatty acid coated particles at all concentrations. Thermal conductivity studies show enhancement only above a critical concentration for all fluids...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28734151/magnetically-recyclable-reduced-graphene-oxide-nanosheets-magnetite-palladium-aerogel-with-superior-catalytic-activity-and-reusability
#17
Yan Feng, Hui Zhang, Baifu Xin, Jie Wu
A two-step method was employed to synthesize reduced graphene oxide nanosheets/magnetite-palladium (rGSs/Fe3O4-Pd) aerogel, with excellent catalytic activity and recyclability. Firstly, graphene oxide nanosheet (GS) hydrogels were formed by the self-assembly of GSs during the hydrothermal process. Meanwhile, hematite (α-Fe2O3) and Pd nanoparticles (NPs) were synthesized and anchored onto the surface of the hydrogel. During heat-treatment, GSs were reduced to rGSs, while nonmagnetic α-Fe2O3NPs were converted to magnetic Fe3O4 NPs...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738283/visual-and-reversible-carbon-dioxide-sensing-enabled-by-doctor-blade-coated-macroporous-photonic-crystals
#18
Yi-Han Lin, Shing-Yi Suen, Hongta Yang
With significant impacts of carbon dioxide on global climate change, carbon dioxide sensing is of great importance. However, most of the existing sensing technologies are prone to interferences from carbon monoxide, or suffer from the use of sophisticated instruments. This research reports the development of reproducible carbon dioxide sensor using roll-to-roll compatible doctor blade coated three-dimensional macroporous photonic crystals. The pores are functionalized with amine groups to allow the reaction with carbon dioxide in the presence of humidity...
July 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735190/surface-complexation-modeling-of-calcite-zeta-potential-measurements-in-brines-with-mixed-potential-determining-ions-ca-2-co3-2-mg-2-so4-2-for-characterizing-carbonate-wettability
#19
Jin Song, Yongchao Zeng, Le Wang, Xindi Duan, Maura Puerto, Walter G Chapman, Sibani L Biswal, George J Hirasaki
This study presents experiment and surface complexation modeling (SCM) of synthetic calcite zeta potential in brine with mixed potential determining ions (PDI) under various CO2 partial pressures. Such SCM, based on systematic zeta potential measurement in mixed brines (Mg(2+), SO4(2-), Ca(2+) and CO3(2-)), is currently not available in the literature and is expected to facilitate understanding of the role of electrostatic forces in calcite wettability alteration. We first use a double layer SCM to model experimental zeta potential measurements and then systematically analyze the contribution of charged surface species...
July 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735188/photoelectrochemical-pec-studies-on-cu2sns3-cts-thin-films-deposited-by-chemical-bath-deposition-method
#20
H D Shelke, A C Lokhande, J H Kim, C D Lokhande
Cu2SnS3 (CTS) thin films have been successfully deposited on a cost-effective stainless steel substrate by simple and inexpensive chemical bath deposition (CBD) method. The films are deliberated in provisos of their structural, morphological, optical and photoelectrochemical (PEC) properties before and after annealing treatment, using various physico-chemical techniques. The XRD studies showed the formation of triclinic phase of CTS films with nanocrystalline structure. Also, the crystallinity is enhanced with annealing and the secondary phase of Cu2S observed...
July 11, 2017: Journal of Colloid and Interface Science
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