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Journal of Colloid and Interface Science

Han Ma, Zhigang Shen, Shuang Ben
In this study, we report a potentially scalable method for producing multilayer molybdenum disulfide (MoS2 ) nanosheets. The addition of a small amount of ammonia solution can improve the exfoliation of MoS2 nanosheets in water. The surface charge induced by spontaneous adsorption of hydroxyl ions on MoS2 surfaces favors the exfoliation process. The edge charge generated by the ionization of edge-attached groups facilities the dispersion of exfoliated nanosheets in water. It is also found that smaller MoS2 nanosheets show an improved photocatalytic performance, which stems from enhanced edge effects and a reduced flake thickness...
November 5, 2018: Journal of Colloid and Interface Science
M Rincón-Fontán, L Rodríguez-López, X Vecino, J M Cruz, A B Moldes
HYPOTHESIS: Vitamin E has interesting biological functions for the cosmetic and pharmaceutical industry because it can act as a fat-soluble antioxidant, as well as peroxyl radical scavenger. However, this vitamin is formed by a group of compounds that include tocopherols (γ-tocopherols, α-tocopherol) characterized by their poor solubility in water, what implies the need of using stabilizing agents such as biosurfactants or minerals, in order to make them soluble or stable in formulations composed by water and oil...
November 3, 2018: Journal of Colloid and Interface Science
Marie Peskova, Ladislav Ilkovics, David Hynek, Simona Dostalova, Esther M Sanchez-Carnerero, Marek Remes, Zbynek Heger, Vladimir Pekarik
Palladium and silver nanoparticles (NPs) anchored at the outer surface of ferritin form stable suspension of non-coated particles that possess several catalytic and enzymomimetic activities. These activities are strongly affected by detergents that significantly influence the reaction efficiency and specificity. Reductive dehalogenation of various azo dye substrates shows strong differences in reactivity for each substrate-detergent pair. Reductive dehalogenation is negatively influenced by cationic detergents while catalytic depropargylation is severely impaired by polyethylene oxide containing detergents that is an important finding in respect to potential biorthogonal applications...
November 3, 2018: Journal of Colloid and Interface Science
Hongbin Xu, Renbing Wu
Transition metal chalcogenides (TMCs) have attracted considerable interest owing to their satisfied theoretical capacity, good safety and environmentally benign nature in lithium-ion batteries (LIBs). However, the poor conductivity as well as the severe volume changes during the discharge-charge process cause capacity fading rapidly, which severely impede the practical applications of TMCs. To address this challenge, a hollow hybrid architecture assembled by Nix Co1-x Se2 nanosheets and strongly coupled porous carbon have been rational designed...
November 2, 2018: Journal of Colloid and Interface Science
Yitong Wang, Ling Wang, Maiomiao Yan, Anran Cai, Shuli Dong, Jingcheng Hao
Plasmonic microgels (PMgels) of the self-assembled gold nanorods (Au NRs) with side-by-side piles in ionic liquid microgels were prepared. Transmission electron microscopy (TEM) images revealed unique self-growth and self-arrangement of Au NRs in the microgel systems. The fabrication of PMgels occurs through co-assembling Au NRs and an ionic liquid microgel system, therefore differs from the fabrication of conventional plasmonic hybrid nanocomposites. These PMgels showed strong absorption in the near-infrared window and enhanced photothermal conversion efficiency, up to 52...
November 1, 2018: Journal of Colloid and Interface Science
Xing-Liang Yin, Lei-Lei Li, Da-Cheng Li, Deng-Hu Wei, Cheng-Chao Hu, Jian-Min Dou
Spontaneous solar-driven water splitting to generate H2 with no pollution discharge is an ideal H2 generation approach. However, its efficiency remains far from real application owing to the poor light-harvesting and ultrafast charge recombination of photocatalysts. To address these issues, herein, we employed a novel but simple chemical bath deposition (CBD) method to construct CdS/SrTiO3 nanodots-on-nanocubes at room temperature (ca. 25 °C). The as-synthesized nanohybrids not only expand light absorption from ultraviolet (UV) to visible light but also significantly retard charge recombination owing to the well-defined heterostructure formation...
October 31, 2018: Journal of Colloid and Interface Science
Hua Guo, Ya Su, Yanling Shen, Yumei Long, Weifeng Li
Optimizing heterostructure of nanocomposites holds great potential for making full use of their ability. Herein, gold nanoparticles (AuNPs) were in situ synthesized over the surface of graphitic carbon nitride (g-C3 N4 ) via one-step pyrolyzation route using a single source precursor. The precursor of melamine chloroauric (C3 H6 N6 H+ ⋅AuCl4 - ) was obtained through chemical precipitation reaction between melamine and chloroauric acid. The morphological analysis confirmed the compact contact between Au nanoparticles and g-C3 N4 ...
October 31, 2018: Journal of Colloid and Interface Science
Wen-Kun Gao, Jing-Qi Chi, Zhong-Bing Wang, Jia-Hui Lin, Da-Peng Liu, Jing-Bin Zeng, Jian-Feng Yu, Lei Wang, Yong-Ming Chai, Bin Dong
Exploring low-cost and outstanding bimetallic phosphides to substitute noble metals as electrocatalysts for oxygen evolution reaction (OER) in alkaline media is essential for renewable energy technologies. Herein, bimetallic nickel-iron phosphides nanoparticles (P-NiFe-800 NPs) with rich defects have been synthesized through gas annealing at 800 °C and phosphorization using uniform nickel-iron nanocubes (NiFe NCs) as precursor. At optimized calcination temperature, the obtained P-NiFe-800 NPs are composed of uniform nanoparticles with the rough surface, which suggests the larger surface area and more exposed rich active sites than other samples for OER...
October 30, 2018: Journal of Colloid and Interface Science
Haim Sazan, Silvia Piperno, Michael Layani, Shlomo Magdassi, Hagay Shpaisman
Directed-assembly by standing surface acoustic waves (SSAWs) only requires an acoustic contrast between particles and their surrounding medium. It is therefore highly attractive as this requirement is fulfilled by almost all dispersed systems. Previous studies utilizing SSAWs demonstrated mainly reversible microstructure arrangements from nanoparticles. The surface chemistry of colloids dramatically influences their tendency to aggregate and sinter; therefore, it should be possible to form permanent microstructures with intimate contact between nanoparticles by controlling this property...
October 30, 2018: Journal of Colloid and Interface Science
Liang Tian, Junyi Li, Feng Liang, Shuai Chang, Haijun Zhang, Mingyang Zhang, Shaowei Zhang
Two-dimensional atomically thin boron nitride (BN) nanosheets possess many distinctive properties but their applications are still being hindered by the technical difficulties in their synthesis methods, due to the strong lip-lip interactions between their basal planes. In this paper, we reported a facile and scalable bottom-up approach to synthsizing atomically thin BN nanosheets in a molten salt medium. As-prepared BN nanosheets can be used as an effective co-catalyst to improve the catalytic performance of carbon nitride photocatalyst, owing to the interfacial effect induced by their addition...
October 30, 2018: Journal of Colloid and Interface Science
Hao Jia, Mahmut Dirican, Cemile Aksu, Na Sun, Chen Chen, Jiadeng Zhu, Pei Zhu, Chaoyi Yan, Ya Li, Yeqian Ge, Jiansheng Guo, Xiangwu Zhang
Antimony tin (SnSb) based materials have become increasingly attractive as a potential anode material for sodium-ion batteries (SIBs) owing to their prominent merit of high capacity. However, cyclic stability and rate capability of SnSb anodes are currently hindered by their large volume change during repeated cycling, which results in severe capacity fading. Herein, we introduce carbon-coated centrifugally-spun SnSb@carbon microfiber (CMF) composites as high-performance anodes for SIBs that can maintain their structural stability during repeated charge-discharge cycles...
October 30, 2018: Journal of Colloid and Interface Science
Gang Yuan, Xiao Zhao, Yeru Liang, Lin Peng, Hanwu Dong, Yong Xiao, Chaofan Hu, Hang Hu, Yingliang Liu, Mingtao Zheng
As a new class of zero-dimensional carbon nanomaterials, carbon dots have triggered intensive research interest in various fields. However, the low surface area, hydrophilicity, and agglomeration characteristics limit their applications in energy storage fields. Herein, we demonstrate that nitrogen-doped carbon dots can be employed as efficient nanoenhancer to boost the electrochemical performance of three-dimensional graphene. The as-prepared materials exhibit an interconnected framework with abundant oxygen- and nitrogen-containing functional groups, which enable fast penetration and transport of electrolyte ions and provide more active sites and electric conductivity...
October 30, 2018: Journal of Colloid and Interface Science
Mingmei Zhang, Hong Liu, Ying Wang, Tianjiao Ma
Three-dimensional (3D) flower center/petal nanostructure exhibits excellent electrochemical performance because of their unique unfold ultra-thin multi-layer structure benefit to the rapid transmission of electrons and the full infiltration of the electrolyte. A three-phase Fe5 Ni4 S8 nanosflower is constructed by one step alcohothermal technique using a mixture solvent of glycerol, diethylene glycol and ethylenediamine. Ethylenediamine successfully functions as the complexing agent of metal ions to slowly release the metal ions in the process of reaction, which encourage the flower petal nanostructure formation...
October 30, 2018: Journal of Colloid and Interface Science
Yuanyuan Zhang, Lili Wang, Fengying Dong, Qiao Chen, Haiyan Jiang, Mei Xu, Jinsheng Shi
Bi2 O2 CO3 -based ternary composite materials are generally synthesized by two- or multi-step method and special precursor of CO3 2- is usually utilized in synthesis of Bi2 O2 CO3 , which are time-consuming, laborious and relatively costly. In this paper, for the first time, a facile one-step solvothermal method is used to fabricate Z-scheme Bi2 O2 CO3 /Bi/Bi2 WO6 ternary composites. Interestingly, ethylene glycol not only acts as solvent for the reaction system, but also reduced Bi3+ into metallic Bi and itself is oxidized to CO3 2- , which could construct Bi2 O2 CO3 ...
October 30, 2018: Journal of Colloid and Interface Science
Xueyi Guo, Weijia Wang, Xiuhong Yuan, Ying Yang, Qinghua Tian, Yang Xiang, Yan Sun, Zhiming Bai
Magnetic nano capture agent (MNCA)-based magnetic separation is considered as a promising approach to rapidly isolate heavy metals from blood. Limited removal efficiency and potential biosafety risks are the major challenges for the clinical use of MNCA-based magnetic separation. Here, we report a highly-efficient MNCA-based magnetic separation of heavy metals from blood in continuous multi-stage adsorption mode. The interactions between MNCA and blood components (e.g. blood cells and plasma proteins) and the MNCA-induced cellular immune responses are studied in detail...
October 30, 2018: Journal of Colloid and Interface Science
Tian Zhang, Zhiqiang Li, Wenbo Wang, Yong Wang, Baoyu Gao, Zhining Wang
Palygorskite (Pal) is a kind of low-cost and environment-friendly natural nanoclay material with tubular structure and excellent hydrophilicity. TiO2 nanoparticles, especially anatase phase, have prominent photocatalytic bactericidal and organic pollutant decomposition activities. In this work, Pal and Pal/TiO2 nanocomposite were successfully embedded in the polyamide (PA) selective layer of the reverse osmosis (RO) membranes via interfacial polymerization. The tubular structure of Pal possesses a cross-sectional area of 0...
October 29, 2018: Journal of Colloid and Interface Science
Prakhar Sengar, Karelid Garcia-Tapia, Kanchan Chauhan, Akhil Jain, Karla Juarez-Moreno, Hugo A Borbón-Nuñez, Hugo Tiznado, Oscar E Contreras, Gustavo A Hirata
The current photodynamic therapy (PDT) is majorly hindered by the shallow penetration depth and oxygen dependency, limiting its application to deep-seated solid hypoxic tumors. Thus, it is meaningful to develop efficient X-ray mediated PDT system capable of generating reactive oxygen species (ROS) under both the normoxic and hypoxic conditions. Herein, we report the synthesis and characterization of nanocomposite, YAG:Pr@ZnO@PpIX with an amalgamation of UV-emitting Y2.99 Pr0.01 Al5 O12 (YAG:Pr) nanoscintillator, and zinc oxide (ZnO) and protoporphyrin IX (PpIX) as photosensitizers...
October 29, 2018: Journal of Colloid and Interface Science
Ngoc-Hanh Cao-Luu, Quoc-Thai Pham, Zong-Han Yao, Fu-Ming Wang, Chorng-Shyan Chern
HYPOTHESIS: How to encapsulate poly(N-isopropylacrylamide) (PNIPAM) mesoglobule cores by silica shells greatly affects the resultant nanoparticle structures. Incorporation of acrylamide (AM) unit into PNIPAM in combination with 3-glycidyloxypropyltrimethoxysilane (GLYMO, as a coupling agent) effectively induces nucleation and growth of silica on PNIPAM core surfaces, where the -NH2 of acrylamide reacts with the epoxide of GLYMO while GLYMO further participates in subsequent sol-gel reaction of tetraethyl orthosilicate (TEOS), thereby leading to desirable particle morphology...
October 29, 2018: Journal of Colloid and Interface Science
Huihui Sun, Katarzyna Zielinska, Marina Resmini, Ali Zarbakhsh
In dermal drug delivery, the influence of the chemical structure of the carriers on their penetration mechanisms is not yet fully understood. This is a key requirement in order to design highly efficient delivery systems. In this study, neutron reflectivity is used to provide insights into the interactions between thermoresponsive N-isopropylacrylamide based nanogels, cross-linked with 10%, 20% and 30% N,N'-methylenebisacrylamide, and skin lipid multi-bilayers models. Ceramide lipid multi-bilayers and ceramide/cholesterol/behenic acid mixed lipid multi-bilayers were used for this work...
October 28, 2018: Journal of Colloid and Interface Science
Mehdi Omri, Matthieu Becuwe, Carine Davoisne, Gwladys Pourceau, Anne Wadouachi
A new series of supported organocatalysts, prepared by a simple method, were used for selective sugar oxidation. This approach is based on the immobilization of a nitroxide derivative through a carboxylic function on nanometric metal oxides (TiO2 , Al2 O3 and CeO2 ), allowing the recovery of the catalyst. These hybrid materials were carefully characterized by Diffuse Reflectance FT-IR spectroscopy (DRIFT), ThermoGravimetric Analysis (TGA), X-Ray Diffraction (XRD), Brunauer-Emmet-Teller surface area measurements (B...
October 28, 2018: Journal of Colloid and Interface Science
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