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Journal of Colloid and Interface Science

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https://www.readbyqxmd.com/read/28926724/in-situ-grafting-to-improve-polarity-of-polyacrylonitrile-hollow-fiber-supported-polydimethylsiloxane-membranes-for-co2-separation
#1
Leiqing Hu, Jun Cheng, Yannan Li, Jianzhong Liu, Junhu Zhou, Kefa Cen
Surface grafting modification was proposed to improve the surface polarity of polyacrylonitrile hollow fiber-supported polydimethylsiloxane (PDMS) membrane. The initiator 3-aminopropyltriethoxysilane containing one amine group was integrated into PDMS, and polyvinyl pyrrolidone (PVP) with strong polarity was connected to the surface by reacting with amine groups. Surface grafting modification was proven on X-ray photoelectron spectroscopy. The sharp decrease (from ∼98° to ∼28°) in water contact angle of the PDMS membrane indicated the significant improvement in surface polarity after the modification...
September 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923744/dynamic-assembly-of-molecularly-imprinted-polymer-nanoparticles
#2
Haiyue Gong, Solmaz Hajizadeh, Lingdong Jiang, Huiting Ma, Lei Ye
Manipulation of specific binding and recycling of materials are two important aspects for practical applications of molecularly imprinted polymers. In this work, we developed a new approach to control the dynamic assembly of molecularly imprinted nanoparticles by surface functionalization. Molecularly imprinted polymer nanoparticles with a well-controlled core-shell structure were synthesized using precipitation polymerization. The specific binding sites were created in the core during the first step imprinting reaction...
September 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923736/atomic-layered-mn-clusters-deposited-on-palygorskite-as-powerful-adsorbent-for-recovering-valuable-rees-from-wastewater-with-superior-regeneration-stability
#3
Xujian Li, Xing Zhang, Heng Yang, Qi Zhou
The control of dispersity and size of metal particles deposited on substrate surface are always the major challenges for fabricating the efficient and stable metallic nanoparticles-decorated composite. Herein, we proposed a simple liquid-phase atomic layer deposition (L-ALD) method to obtain an atomic-layered MnO2 nanoparticles loaded palygorskite nanorod (MnO2@Pal), involving two-step procedures comprised of the solid-liquid interfacial reaction between organic manganese precursor and surface hydroxyl groups of palygorskite, and then a calcination treatment to activate surface Mn, which is used as a powerful adsorbent for recovery of REE ions from wastewater...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918375/synthesis-of-fluorescent-dendrimers-with-aggregation-induced-emission-features-through-a-one-pot-multi-component-reaction-and-their-utilization-for-biological-imaging
#4
Weihua Luo, Ruming Jiang, Meiying Liu, Qing Wan, Jianwen Tian, Yuanqing Wen, Qian-Yong Cao, Junfeng Hui, Xiaoyong Zhang, Yen Wei
Hyperbranched polymers have attracted wide research attention owing to their unique topological structure, physicochemical properties and great potential for applications such asadditives, drug delivery, catalysts and nanotechnology. Among these, the polyamidoamine(PAMAM) dendrimers are some of the most important dendrimers. However, the synthesis and biomedical applications of fluorescent PAMAM dendrimers have received only limited attention. In this work, we present a rather effective and convenient approach for synthesis of fluorescent PAMAM dendrimers with aggregation-induced emission (AIE) properties through a one-pot catalyst-free Mannich reaction under rather mild experimental conditions (e...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28898732/poly-n-isopropylacrylamide-hydroxyapatite-nanocomposites-as-thermoresponsive-filling-materials-on-dentinal-surface-and-tubules
#5
Paolo Tempesti, Giovanni Simone Nicotera, Massimo Bonini, Emiliano Fratini, Piero Baglioni
HYPOTHESIS: Dental decay, asa consequence of exposure to acidic foods and drinks, represents one of the most important tooth pathologies. Recently, enamel and dentinal surface remineralization using hydroxyapatite nano- and microparticles has been proposed; however, commercial remineralizing toothpastes are quite expensive, mostly due to the high costs of hydroxyapatite. Hence, we propose a thermoresponsive hybrid nanocomposite material as filler for tooth defects. The use of thermoresponsive composite particles aims at filling exposed dentinal tubules in response to a change of temperature in the oral cavity...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923748/controllable-mullite-bismuth-ferrite-micro-nanostructures-with-multifarious-catalytic-activities-for-switchable-hybrid-catalytic-degradation-processes
#6
Zhong-Ting Hu, Wen-Da Oh, Yiquan Liu, En-Hua Yang, Teik-Thye Lim
In this work, controllable preparation of micro/nanostructured bismuth ferrites (BFOs) were used to investigate multifarious heterogeneous catalyses, including Fenton/Fenton-like reaction, photocatalysis, photo-Fenton oxidation, and peroxymonosulfate (PMS) activation. Results showed that BFO can be used asa novel catalyst to activate switchable catalytic degradation of organic matters. Additionally, a novel catalytic system for degradation of organic pollutants, which integrating all-above heterogeneous catalyses is denoted as BFO/H2O2/PMS hybrid reaction, is introduced for the first time...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923746/diphenyl-diselenide-immobilized-on-magnetic-nanoparticles-a-novel-and-retrievable-heterogeneous-catalyst-in-the-oxidation-of-aldehydes-under-mild-and-green-conditions
#7
Yalda Rangraz, Firouzeh Nemati, Ali Elhampour
In the present study diselenide stabilized on silica coated Fe3O4 magnetic nano particles asa novel, highly efficient and magnetically retrievable heterogeneous catalyst was designed, synthesized and introduced. Full characterization of the newly prepared magnetic nanocatalyst was authenticated using several physico-chemical characterization techniques such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction patterns (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM)...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923745/influence-of-magnetic-fields-on-calcium-carbonate-scaling-in-aqueous-solutions-at-150%C3%A2-c-and-1bar
#8
Ammar Al Helal, Adam Soames, Rolf Gubner, Stefan Iglauer, Ahmed Barifcani
The experiments performed as a part of this study were conducted to evaluate the effect of magnetic field treatment upon the scale forming tendency of brine solution composed primarily of calcium bicarbonate ions. The reported results were generated using a Dynamic Scale Loop system with the brine solution exposed to a magnetic field generated by a 6480 Gauss magnet of grade N45SH in a diametrical orientation for 2.5s. Following magnetic exposure, the brine solution was exposed to an elevated temperature 150°C at 1bar to promote the formation of scale within a capillary tube...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923742/effects-of-calcination-temperature-and-heating-rate-on-the-photocatalytic-properties-of-zno-prepared-by-pyrolysis
#9
Lingling He, Zhifang Tong, Zhonghua Wang, Ming Chen, Ni Huang, Wei Zhang
A series of ZnO nanorods were prepared by pyrolysis of zinc acetate at different calcination temperatures and heating rates under ambient atmosphere. The as-prepared ZnO nanorods were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic performances of the ZnO nanorods were evaluated by the photodegradation of methyl orange (MO) and 4-nitrophenol (4-NP). The morphology, optical property, surface composition, and photocatalytic performance of the ZnO samples were affected by both calcination temperature and heating rate...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923741/influence-of-molybdenum-doping-on-the-structural-optical-and-electronic-properties-of-wo3-for-improved-solar-water-splitting
#10
Shankara S Kalanur, Hyungtak Seo
Doping WO3 with foreign atoms is a very efficient strategy to modify the structural, optical and electronic properties which could influence its photoelectrochemical (PEC) water splitting activity. In this study, we report a simple and efficient single-step strategy for the fabrication of molybdenum (Mo)-doped WO3 thin films. The characterization results show that doping Mo into WO3 leads to a significant change in the morphology without changing its crystal structure. Elemental mapping and EDS analysis revealed that Mo was homogeneously doped into the crystal lattice of WO3 in the at...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923739/droplet-impact-on-superhydrophobic-surfaces-fully-decorated-with-cylindrical-macrotextures
#11
Mehran Abolghasemibizaki, Reza Mohammadi
HYPOTHESIS: Impacting on a superhydrophobic surface, water droplet spreads to a pancake shape and then retracts and bounces off. Although the collision time is mostly in the order of couple of 10ms for millimetric droplets, researchers have shown recently that decorating the superhydrophobic surface with a single macrotexture or intersecting ridge reduces this contact time if the droplet hits the texture or the intersection exactly in the center. Hence, covering the surface with ridges should address this hitting point restriction...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923737/enhancing-the-microwave-absorption-properties-of-amorphous-coo-nanosheet-coated-co-hexagonal-and-cubic-phases-through-interfacial-polarizations
#12
Jiushuai Deng, Shimei Li, Yuanyuan Zhou, Luyang Liang, Biao Zhao, Xi Zhang, Rui Zhang
Core-shell flower-like composites were successfully prepared by a simple polyol method. These composites were formed by coating dual-phased (face-centered cubic [fcc] and hexagonal close-packed [hcp]) Co with amorphous CoO nanosheets. The microwave absorption properties of the flower-like Co@CoO paraffin composites with various Co@CoO amounts were then investigated. Results showed that the paraffin-based composite containing 70wt% flower-like Co@CoO displayed excellent microwave absorption properties (RE=24...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923735/pegylated-magnetic-prussian-blue-nanoparticles-asa-multifunctional-therapeutic-agent-for-combined-targeted-photothermal-ablation-and-ph-triggered-chemotherapy-of-tumour-cells
#13
Peng Xue, Lihong Sun, Qian Li, Lei Zhang, Zhigang Xu, Chang Ming Li, Yuejun Kang
Multifunctional nanoagents have become popular and valuable pharmaceuticals for effective cancer treatment. Moreover, there is an increasing tendency to develop therapeutic agents with excellent biocompatibility, high efficiency, specific targeting and combinatorial treatment effects. In this study, we proposed a facile technique to synthesize PEGylated (polyethylene glycol modified) magnetic Prussian blue (PB) nanoparticles with encapsulated doxorubicin (DOX), abbreviated as Fe3O4@PB/PEG/DOX NPs, for combined targeted photothermal ablation and pH-triggered chemotherapy of tumour cells...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918378/enhanced-fluoride-removal-by-la-doped-li-al-layered-double-hydroxides
#14
Jianguo Cai, Xin Zhao, Yanyang Zhang, Quanxing Zhang, Bingcai Pan
In this study La intercalated Li/Al layered double hydroxide (LDH) was developed for efficient water defluoridation. The La-modified material, i.e., La doped Li/Al-LDH, exhibits more preferable fluoride adsorption than Li/Al-LDH in a broad pH range of 5-9, with the working capacity twice of the latter and seven times of magnitude higher than activated alumina. The fluoride removal kinetics is well fitted by pseudo-second order model, and the adsorption isotherm is well described by Freundlich model. Effect of pH and competing ions was examined during fluoride sequestration...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918377/stable-janus-superhydrophilic-hydrophobic-nickel-foam-for-directional-water-transport
#15
Yifan Si, Liwei Chen, Fuchao Yang, Fei Guo, Zhiguang Guo
Janus superhydrophilic/hydrophobic macroporous nickel foam for directional water transport has been demonstrated via a simple floating strategy. Water can transport from hydrophobic to superhydrophilic layer through Janus nickel foam, but cannot transfer from superhydrophilic to hydrophobic layer. This "3D water diode" Janus nickel foam shows extremely high transport rate and outstanding stability. After damaged by abrasion, its directional water transport property retains well.
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918376/effect-of-precursors-on-the-structure-and-activity-of-cuo-coox-%C3%AE-al2o3-catalysts-for-no-reduction-by-co
#16
Lingling Zhang, Xiaojiang Yao, Yiyang Lu, Chuanzhi Sun, Changjin Tang, Fei Gao, Lin Dong
Catalytic reduction of NO by CO was studied over a series of CuO-CoOx/γ-Al2O3 catalysts prepared by co-impregnation with different copper and cobalt precursors (acetate and nitrate) to evaluate the structure-activity relationship. The obtained samples were characterized in detail by means of XRD, LRS, XPS, H2-TPR and in situ FT-IR technologies. Results indicate that copper oxide is agglomerated while cobalt oxide is dispersed on γ-Al2O3 for the catalyst prepared from copper acetate and cobalt acetate precursors (CuACoA); CuxCo3-xO4 spinel is formed and agglomerated on the catalyst prepared from copper nitrate and cobalt nitrate precursors (CuNCoN); while both copper oxide and cobalt oxide could be homogeneously dispersed for the catalyst prepared from copper nitrate and cobalt acetate precursors (CuNCoA), which exhibits the best activity for NO reduction by CO...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918373/defect-free-surface-modification-methods-for-solubility-tunable-carbon-nanotubes
#17
Hee Dae Lee, Byung Min Yoo, Tae Hoon Lee, Ho Bum Park
Although carbon nanotubes (CNTs) have outstanding physical properties, there are still challenging issues such as poor dispersibility and miscibility between organic polymers and CNTs for polymer nanocomposites. Chemical modifications (e.g., strong acid based oxidation, carboxylation, etc.) can improve dispersion properties and compatibility, but such surface modification methods often lead to damage to the pristine CNT structure and also deteriorate the mechanical properties of CNTs. Here we demonstrate a simple, defect-free and scalable method for well-dispersed CNTs in common organic solvents, using dopamine and amine-terminated polyethylene glycol derivatives...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918372/enhanced-visible-light-photocatalytic-nitrogen-fixation-over-semicrystalline-graphitic-carbon-nitride-oxygen-and-sulfur-co-doping-for-crystal-and-electronic-structure-modulation
#18
Xiangwen Feng, Huan Chen, Fang Jiang, Xin Wang
Oxygen and sulfur co-doped semicrystalline graphitic carbon nitride (HGCNOS) was synthesized by a one-pot hydrothermal method and applied in visible-light photocatalytic nitrogen fixation. Remarkably, HGCNOS exhibited a higher photocatalytic activity than pristine graphitic carbon nitride (GCN). Oxygen doping caused semicrystalline structure, making exciton dissociated at the order-disorder interfaces of HGCNOS and releasing more electrons and holes. Furthermore, the conduction band position of HGCNOS was elevated by sulfur doping, promoting the reduction ability of HGCNOS...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915483/sulphur-and-nitrogen-dual-doped-mesoporous-carbon-hybrid-coupling-with-graphite-coated-cobalt-and-cobalt-sulfide-nanoparticles-rational-synthesis-and-advanced-multifunctional-electrochemical-properties
#19
Anquan Zhu, Pengfei Tan, Lulu Qiao, Yi Liu, Yongjin Ma, Jun Pan
Doping-type carbon matrixes not only play a vital role on their electrochemical properties, but also are capable of suppressing the crush and aggregation phenomenon in the electrode reaction process for pristine metallic compound. Herein, graphite coated cobalt and cobalt sulfide nanoparticles decorating on sulphur and nitrogen dual-doped mesoporous carbon (Co@Co9S8/S-N-C) was fabricated by a combined hydrothermal reaction with pyrolysis method. Benefited from g-C3N4 template and original synthetic route, as-obtained Co@Co9S8/S-N-C possessed high specific surface area (751...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923747/measurement-of-interfacial-area-from-nmr-time-dependent-diffusion-and-relaxation-measurements
#20
M Fleury
The interfacial area between two immiscible phases in porous media is an important parameter for describing and predicting 2 phase flow. Although present in several models, experimental investigations are sparse due to the lack of appropriate measurement techniques. We propose two NMR techniques for the measurement of oil-water interfacial area: (i) a time dependent NMR diffusion technique applicable in static conditions, similar to those used for the measurement of the solid specific surface of a porous media, and (ii) a fast relaxation technique applicable in dynamic conditions while flowing, based on an interfacial relaxation mechanism induced by the inclusion of paramagnetic salts in the water phase...
September 7, 2017: Journal of Colloid and Interface Science
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