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Journal of Colloid and Interface Science

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https://www.readbyqxmd.com/read/28646759/free-standing-graphene-vanadium-oxide-composite-as-binder-free-electrode-for-asymmetrical-supercapacitor
#1
Lingjuan Deng, Yihong Gao, Zhanying Ma, Guang Fan
Preparation of free-standing electrode materials with three-dimensional network architecture has emerged as an effective strategy for acquiring advanced portable and wearable power sources. Herein, graphene/vanadium oxide (GR/V2O5) free-standing monolith composite has been prepared via a simple hydrothermal process. Flexible GR sheets acted as binder to connect the belt-like V2O5 for assembling three-dimensional network architecture. The obtained GR/V2O5 composite can be reshaped into GR/V2O5 flexible film which exhibits more compact structure by ultrasonication and vacuum filtration...
June 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28645036/influence-of-surface-states-on-blinking-characteristics-of-single-colloidal-cdse-cds-zns-core-multishell-quantum-dot
#2
Hao Xu, Hjalmar Brismar, Ying Fu
We carefully characterized the fluorescence blinking of single colloidal CdSe-CdS/ZnS core-multishell quantum dots (QDs) with different surface modifications, including octadecylamine (ODA) coated QDs dispersed in chloroform, aqueous 3-mercaptopropionic acids (3MPA) coated QDs in HEPES solution treated by Ca(2+) ions and ethylene glycol tetraacetic acid (EGTA, Ca(2+) chelator), and aqueous 3MPA-QDs treated by glycerol. It was found that the on- and off-state probability density distributions displayed different rules...
June 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28646760/transparent-gel-composite-films-with-multiple-functionalities-long-lasting-anti-fogging-underwater-superoleophobicity-and-anti-bacterial-activity
#3
Matt W England, Tomoya Sato, Chihiro Urata, Liming Wang, Atsushi Hozumi
Transparent gel-based composite films with multiple functionalities, showing long-lasting anti-fogging properties, underwater superoleophobicity, and anti-bacterial activity were successfully prepared from polyvinylpyrrolidone (PVP) and aminopropyl-functionalized clay (AMP-clay). Due to the addition of glutaraldehyde (GA, cross-linker) into the PVP matrices, and AMP-functionalities to the substrate surfaces, both the adhesion properties in water and durability of the anti-fogging properties were significantly improved...
June 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28646758/thermo-responsive-diblock-and-triblock-cationic-copolymers-at-the-silica-aqueous-interface-a-qcm-d-and-afm-study
#4
Saeed Zajforoushan Moghaddam, Kaizheng Zhu, Bo Nyström, Esben Thormann
The properties of synthesized diblock poly(N-isopropylacrylamide)-poly((3-acrylamidopropyl)trimethylammonium chloride) and triblock methoxy-poly(ethylene glycol)-poly(N-isopropylacrylamide)-poly((3-acrylamidopropyl)trimethylammonium chloride) cationic copolymers at the silica/aqueous interface are investigated using quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM). Moreover, dynamic light scattering is employed to assess the copolymers in terms of the hydrodynamic size and interchain aggregation...
June 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28645037/slip-additive-migration-surface-morphology-and-performance-on-injection-moulded-high-density-polyethylene-closures
#5
Nabeen Dulal, Robert Shanks, Thomas Gengenbach, Harsharn Gill, David Chalmers, Benu Adhikari, Isaac Pardo Martinez
HYPOTHESIS: The amount and distribution of slip agents, erucamide, and behenamide, on the surface of high-density polyethene, is determined by integral characteristics of slip agent structure and polymer morphology. A suite of surface analysis techniques was applied to correlate physicochemical properties with slip-additive migration behaviour and their surface morphology. The migration, surface morphology and physicochemical properties of the slip additives, crystallinity and orientation of polyethene spherulites and interaction between slip additives and high-density polyethene influence the surface characteristics...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28645035/ctab-induced-hierarchical-bismuth-microspheres-for-visible-light-photocatalytic-study
#6
Fengnan Zhang, Yan Zhao, Yawen Li, Gongjuan Wu, Jingzhe Zhao
Nanosheet constructed bismuth microspheres were prepared through an aqueous reduction approach in the presence of CTAB molecules, with initial formed BiOCl as the precursor and hydrazine hydrate as the reductant. The flower-like morphology and platelet units of BiOCl precursor determined the evolution of hierarchical Bi microspheres through a morphology-heredity process. Trisodium citrate was introduced to keep the Bi microspheres from oxidation, the high purity in composition are beneficial to eliminate the influence of bismuth oxides...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28633118/surface-enhanced-raman-scattering-properties-of-dynamically-tunable-nanogaps-between-au-nanoparticles-self-assembled-on-hydrogel-microspheres-controlled-by-ph
#7
Huilin Li, Dandan Men, Yiqiang Sun, Dilong Liu, Xinyang Li, Liangbin Li, Cuncheng Li, Weiping Cai, Yue Li
We developed an interesting route for preparing a poly (acrylamide-co-acrylic acid) (P(AAm-co-AA)) hydrogel microsphere with a coating of Au nanospheres (hydrogel microsphere @ Au nanospheres) through self-assembly based on electrostatic interaction. The fabricated composites could be used as highly sensitive enhanced Raman scattering substrates. The nanogaps between adjacent Au nanospheres were dynamically tuned by volume changes in the hydrogel microspheres in the semiwet state under different pH conditions...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28633117/breakup-characteristics-of-aqueous-droplet-with-surfactant-in-oil-under-direct-current-electric-field
#8
Xiaoming Luo, Haipeng Yan, Xin Huang, Donghai Yang, Jing Wang, Limin He
The breakup process of aqueous droplet with surfactant suspended in oil under direct current (DC) electric field is investigated in this paper. The characteristics of the breakup process, stretching, necking and breakup, are discussed quantitatively with the electric capillary number Ca and the dimensionless surfactant concentration C(∗) which is the ratio of surfactant concentration to the critical micelle concentration. The results show that the presence of surfactant reduces the steady deformation of droplet and significantly decelerates the stretching process, resulting from the redistribution of surfactant molecules within the oil/water interface...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28628872/ag-nanowire-zno-nanobush-hybrid-structures-for-improved-photocatalytic-activity
#9
Qui Thanh Hoai Ta, Sungho Park, Jin-Seo Noh
Reverse-engineered Ag nanowire/ZnO nanobush hybrid structures have been synthesized for the first time by a combination of polyol method and low-temperature solution method. Through the elaborate control of Ag-to-ZnO weight ratio, vertically aligned ZnO nanobushes grew on the surface of well-faceted Ag nanowires. The Ag/ZnO hybrid nanostructures showed the crystal features of both Ag nanowires and wurtzite ZnO nanostructures. They exhibited strong UV absorption, whereas their photoluminescence spectra were much weaker than pure ZnO nanostructures due to the inhibited carrier recombination...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28624745/silver-chloride-enwrapped-silver-grafted-on-nitrogen-doped-reduced-graphene-oxide-as-a-highly-efficient-visible-light-driven-photocatalyst
#10
Liang Wang, Yilun Shi, Tianfu Wang, Lili Zhang
The visible-light-driven plasmonic photocatalyst silver chloride enwrapped silver/nitrogen-doped reduced graphene oxide (AgCl@Ag/N-rGO) was prepared by a facile hydrothermal-in situ oxidation method and characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The characterization results reveal that Ag nanoparticles (NPs) were first grafted on N-rGO via N-groups as anchor sites and then enwrapped by AgCl by in situ oxidation...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28622566/crosslinking-hydroxylated-reduced-graphene-oxide-with-raft-cta-a-nano-initiator-for-preparation-of-well-defined-amino-acid-based-polymer-nanohybrids
#11
Mina Namvari, Chandra S Biswas, Qiao Wang, Wenlang Liang, Florian J Stadler
Here, we demonstrate a novel reversible addition-fragmentation chain transfer agent (RAFT-CTA)-modified reduced graphene oxide nanosheets (CTA-rGONSs) by crosslinking rGONSs with a RAFT-CTA via esterification reaction. These nano CTA-rGONSs were used to polymerize a hydrophobic amino acid-based methacrylamide (N-acryloyl-l-phenylalanine methyl ester) monomer with different monomer/initiator ratios. Thermogravimetric analysis showed that the polymer-graphene composites were thermally more stable than GO itself...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28622562/hierarchical-flower-like-nickel-ii-oxide-microspheres-with-high-adsorption-capacity-of-congo-red-in-water
#12
Yingqiu Zheng, Bicheng Zhu, Hua Chen, Wei You, Chuanjia Jiang, Jiaguo Yu
Monodispersed hierarchical flower-like nickel(II) oxide (NiO) microspheres were fabricated by a facile solvothermal reaction with the assistance of ethanolamine and a subsequent calcination process. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption isotherms, zeta potential measurement and Fourier transform infrared spectroscopy. Flower-like nickel(II) hydroxide microspheres with uniform diameters of approximate 6...
June 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28618385/enhanced-hydrogen-production-of-pbte-pbs-tnas-electrodes-modified-with-ordered-mesoporous-carbon
#13
Shiyuan Gao, Bin Wang, Zhongqing Liu
PbTe-PbS/TiO2 nanotube arrays (PbTe-PbS/TNAs) were synthesized by the successive ionic layer adsorption and reaction (SILAR) followed by linear sweep voltammetry (LSV). Using Nafion as a binder, ordered mesoporous carbon was cast on these materials to generate the modified electrodes OMC/PbTe-PbS/TNAs. It was demonstrated that the electrode modification with OMC could enhance the charge transfer between the electrode surface and the electrolyte solution, improve the energy band bending of the electrode/electrolyte interface, increase the active electrochemical surface area of the electrode, and reduce the overpotential of the electrode reactions...
June 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28646761/regulation-on-the-aggregation-induced-emission-aie-of-dna-templated-silver-nanoclusters-by-bsa-and-its-hydrolysates
#14
Wei-Xian Wang, Yuqing Wu, Hong-Wei Li
The aggregation-induced emission (AIE) phenomenon of the metal nanoclusters (NCs) has been discovered quite recently, which is considered to be creative to improve the optical properties of NCs upon ligand aggregation. In the present study, we report an AIE system for double-stranded DNA-templated silver nanoclusters (AgNCs-dsDNA) by using bovine serum albumin (BSA) in solution, which induce a moderate emission enhancement of AgNCs (5-fold) and a blue-shift through a loosen interaction. In addition, significant luminescence enhancement (30-fold) is further stimulated by the addition of digestive enzyme to the system by altering the surface structure of the aggregated particles...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28624744/optimization-of-the-synthesis-of-pd-au-nanoalloys-confined-in-mesoporous-carbonaceous-materials
#15
Alicia Martinez de Yuso, Amandine Maetz, Yassine Oumellal, Claudia Zlotea, Jean-Marc Le Meins, Camelia Matei Ghimbeu
Pd-Au nanoalloys confined in mesoporous carbonaceous materials were synthesized by a rapid one-pot microwave assisted approach. Green polymer resins based on phloroglucinol/glyoxylic acid or glyoxal were co-assembled in the presence of a template and metallic salts followed by microwave treatment between 40 and 80°C and subsequent thermal annealing, allowing simultaneous formation of mesoporous carbonaceous materials with in-situ confined Pd-Au nanoparticles. Several Pd-Au compositions were prepared (PdxAu100-x, where x=90; 80; 70 and 50) and their impact on the alloy structure and particle size/distribution evaluated...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28609740/enhanced-photovoltaic-performance-of-dye-sensitized-solar-cells-based-on-nickel-oxide-supported-on-nitrogen-doped-graphene-nanocomposite-as-a-photoanode
#16
Palraj Ranganathan, Ragu Sasikumar, Shen-Ming Chen, Syang-Peng Rwei, Pedaballi Sireesha
We applied the nitrogen-doped graphene@nickel oxide (NGE/NiO) nanocomposite doped TiO2 as a photo-anode for dye-sensitized solar cells (DSSCs) on fluorine-doped tin oxide (FTO) substrates by screen printing method. Power conversion efficiency (PCE) of 9.75% was achieved for this DSSCs device, which is greater than that of DSSCs devices using GO/TiO2, and NiO/TiO2 based photo-anodes (PCE=8.55, and 9.11%). Also, the fill factor (FF) of the DSSCs devices using the NGE/NiO/TiO2 nanocomposite photo-anode was better than that of other photo-anodes...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28609738/adsorption-of-dyes-on-the-surface-of-polymer-nanocomposites-modified-with-methylamine-and-copper-ii-chloride
#17
Magdalena Ptaszkowska-Koniarz, Joanna Goscianska, Robert Pietrzak
Polymer nanocomposite was prepared by the conventional sol-gel method using formaldehyde and resorcinol. The surface of the nanocomposite was functionalized with methylamine. Some of the samples were additionally impregnated with copper(II) chloride. All the materials obtained were characterized by FT-IR spectroscopy, low-temperature nitrogen sorption, thermal and elemental analysis. The samples modified with amine groups had lower surface areas and smaller pore volumes than the pure nanocomposite. The modification with methylamine and copper(II) chloride led to increased content of both acidic and basic oxygen functional groups...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28645034/formation-of-hematite-nanoparticle-monolayers-of-controlled-coverage-and-structure-at-polymeric-microparticles
#18
Marta Sadowska, Zbigniew Adamczyk, Małgorzata Nattich-Rak
The deposition of hematite nanoparticles (22nm and 29nm in diameter) on negatively charged polystyrene microspheres (820nm in diameter) was studied by micro-electrophoretic measurements and AFM. The influence of ionic strength, varied between 10(-4) and 10(-2)M, was determined. Initially, the electrophoretic mobility change of microspheres upon the addition of controlled amount of hematite nanoparticles were measured. These dependencies were quantitatively interpreted in terms of the general electrokinetic model...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28628874/a-building-blocks-strategy-for-preparing-photocatalytically-active-anatase-tio2-rutile-sno2-heterostructures-by-hydrothermal-annealing
#19
Vagner Romito de Mendonça, Waldir Avansi, Raul Arenal, Caue Ribeiro
Effective heterostructures for photocatalysis need to present good electron-hole mobility among phases, a feature that is only attained with satisfactory interface quality. For very small sizes and with a stable colloidal state, the oriented attachment mechanism can be used to prepare suitable structures by means of a building blocks strategy, whereby preformed nanoparticles are used to control the desired amount of each phase in the heterostructure. Here, we show the success of this strategy for anatase TiO2/rutile SnO2 heterostructures, applying conventional hydrothermal annealing, where successive collisions among particles increase the probability of oriented attachment...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28624746/textual-properties-and-catalytic-performances-of-halloysite-hybrid-ceo2-zro2-nanoparticles
#20
Jing Ouyang, Zai Zhao, Yi Zhang, Huaming Yang
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition...
June 9, 2017: Journal of Colloid and Interface Science
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