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This work aims to study the behavior of temperature-responsive p(NIPAM) and temperature/pH-responsive p(NIPAM)/acrylic acid (AA) microgels. Three microgels were synthesized using surfactant free emulsion polymerization technique, these are p(NIPAM), p(NIPAM)-co-AA 95:5% (w/w) and p(NIPAM)-co-AA 90:10% (w/w). Dynamic light scattering was used to study the behavior of diluted microgel dispersions (0...
Both of surface topography and chemical composition play important roles in affecting the adhesive force and friction force in micro/nano-electromechanical systems (M/NEMS). Two effective approaches of reducing adhesion and friction of contacting interfaces are to create patterned surface and lower surface energy, which are especially beneficial for M/NEMS production yield and product reliability...
Carbon black/latex composites were prepared by the method of miniemulsion polymerization for use in coloration of lyocell. The encapsulation of carbon black with the latex was confirmed by transmission electron microscopy (TEM), Fourier transforms infrared spectra (FTIR) and thermogravimetric analyses (TGA). Experimental results showed that a dispersion of the carbon black/latex composite with excellent...
We report enhancement in quantum yield of quantum dot (QD)/polydimethylsiloxane (PDMS) films via surface functionalization of CdSe/ZnS core/shell QDs. Through ligand-exchange processes, five different ligands possessing ethoxy, ester, or alkyl groups of varying chain lengths passivated the surface of QDs. In suspension, the photoluminescence quantum yield (QY) of the QDs remained relatively unaltered...
The drying processes of poly(ethylene oxide) (PEO) droplets on isothermal and non-isothermal substrates were studied and interesting results were found. When PEO droplet was evaporated isothermally at 30 o C, common evaporation with usual 'puddle' structure was formed. However, at a heating rate of 20 o C/min, the drying process developed two stages. At lower temperatures, a pinned...
The kinetics of reaction between ninhydrin and [Cr(III)-Gly-Tyr] 2+ complex have been studied spectrophotometrically in aqueous and aqueous-micellar media of CTAB and geminis (16-s-16, s=4, 5, 6) at 353K and pH 5.0. The reaction follows first- and fractional-order kinetics with respect to [Cr(III)-Gly-Tyr] 2+ and [ninhydrin], respectively, both in the absence and presence...
In this study, a simple method to coat mesoporous silica layer onto solid silica spheres in a controlled manner via a two-step procedure is reported. Core/shell structured SiO 2 μ-SiO 2 spheres with different shell thickness have been obtained by the application of the optimized hexadecyl trimethyl ammonium bromide/tetraethylorthosilicate (CTAB/TEOS) ratio. The specific surface areas...
Chitosans with different degrees of deacetylation (DD) and different molecular weights (M w ) have been evaluated as flocculants of kaolinite suspensions prepared with demineralized water (DW) and tap water (TW), respectively. The effects of chitosan molecular parameters (i.e. DD and M w ) and environmental conditions (i.e. pH, initial turbidity, flocculant dosage and aqueous media)...
The crystal structure, crystal chemistry and surface properties of three ilmenite samples including IL-F (purchased from the mineral dealership of A. and F. Krantz), IL-Q (Qara-aghaj hard rock deposit, northwest of Iran) and IL-K (placer deposit, south of Iran) were investigated. The microprobe analysis showed that different amounts of Mg, Mn and V have been substituted in the crystal structure of...
Saccharides and especially monosaccharides are well-known to affect the thermal transition of the LCST polymer solution. The studied LCST system is an aqueous polyetheramine solution under unprotected form. The role of saccharide has clearly been highlighted through thermal measurements (absorbance and μDSC) and structural techniques (NMR). Moreover, the impact of the structure and the number of the...
The adsorption of tetrabromobisphenol A (TBBPA) on several typical Chinese soils and soil mineral and organic components were comprehensively investigated in the present study. The adsorption isotherms were well described by the Freundlich equation and the corresponding adsorption capacity constant K f ranged from 2.46 to 357.30L/kg and 16.52 to 136,731.98L/kg for the original soils and the...
This work investigated the flow-field structure of the aerosol when spray pyrolyzing alkoxide sols on the anode of fiber-shaped dye sensitized solar cell. The re-atomization of alkoxide sols was optimized via computational fluid dynamics simulation and validated by experimental observation to provide aerosol flow with higher uniformity. The interaction between the fiber substrates and the aerosol...
Gradient colloidal photonic crystals (GCPCs) with gradients over sub-micrometer dimensions were fabricated by a plasma etching method. The gradient (along the surface normal) could be controlled by plasma treatment, leading to a wider tuning range of the stop band compared with colloidal photonic crystals (CPCs) without gradient. Spheres were non-close-packed (ncp) after plasma treatment, which provided...
Rhodium-platinum (RhPt) colloidal bimetallic nanoclusters with different metal compositions are synthesized through chemical reduction method. Modification effect of poly(vinylpyrrolidone) (PVP) is investigated. Due to its different interaction with metal precursors, PVP can affect the formation of metal nanoclusters and has the ability of tuning surface structures of the bimetallic nanoclusters....
The micellar properties of binary mixtures of sodium dodecyl diamino sulfonate (C12AS) and sodium dodecyl benzene sulfonate (SDBS) in aqueous solution at the pH of 6.5 have been characterized employing both conductometric techniques and isothermal titration microcalorimetry (ITC). The critical micelle concentration (cmc) values for the individual surfactants and their corresponding mixtures were determined...
We describe here the synthesis of imidazolium-presenting silica nanoparticles and the role as a heating source under microwave irradiation. The series of modified nanoparticles with various kinds of counter anions were prepared, and their enhancement abilities of heating under microwave irradiation were compared. Finally, we summarized that the dielectric loss originated from the interaction between...
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