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Advective flow in permeable spheres of radially varying permeability in an electrical filed is studied. A numerical model is developed to elucidate the effect of sphere structure, including the volume-average permeability and the primary particle size, on flow and drag force of the sphere. The radially varying sphere would have stronger internal electroosmotic flow relative to its homogeneous counterpart...
The evolutions of limiting viscosity (η ∞ ), yield stress (τ y ), cohesion energy of WTR networks (E c ), storage modulus (G′), or critical strain (γ c ) for linear viscoelastic (LVE) range with the TSS content of raw water treatment residuals (WTRs) can be properly described by a power-law relationship. For conditioned WTRs, a power-law dependence of η ∞ ,...
Compact PEGylated polymer-caged quantum dots were prepared by covalently cross-linking the surface ligands using bifunctional poly(ethylene glycol). CdSe/ZnSe/ZnS quantum dots prepared in organic solvent via conventional synthesis method were firstly transferred to water phase by surface ligands exchange with glutathione molecules, and then cross-linked by bifunctional PEG through the carboxyl-amine...
Although surface-enhanced (resonance) Raman scattering SE(R)RS spectroscopy is currently employed as a (bio)analytical technique, designing and optimizing of cheaply and easily available SERS-active substrates are still in progress. In this paper, we tested SERS substrates prepared by immobilization of Au colloidal nanoparticles via aminosilane on glass from the point of view of their spectral sensitivity...
In this work, denatured bovine serum albumin (dBSA) is used as a structure-directing agent to fabricate Ag microplates, Ag 2 S nanochains and raspberry-like nanostructures. By simply adjusting the pH of a dBSA–Ag + mixture, Ag 2 S nanochains and raspberry-like nanostructures are obtained at pH 8 and 10, respectively. The structure-directing function of dBSA in different aggregated...
We demonstrate a novel synthesis of sandwich structured superparamagnetic mesoporous microspheres with a silica-coated magnetite core and mesoporous titania shell using a block-copolymer-templating approach. The synthesis process is simple and facile, in which uniform magnetite particles were coated with silica through classical Stöber method. And then, a mesostructured P123/TiO 2 composite...
A UV light-assisted route has been used to synthesis coral SnO 2 nanoparticles. Annealing is introduced to crystallize samples and exclude impurities without changing the morphology. Powder X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis spectra are used...
Entrapping of a fluorogenic material comprising prospective therapeutic activity in microhetrogeneous environments and modulating important photophysical properties is highly desirable as far as potential applications of such systems are concerned. The present work demonstrates the interesting photobehavior of a newly synthesized antioxidative naphthalimide (isoquinolinedione) derivative (ANAP) in...
The solvent effect on the self-assembly of polystyrene (PS) colloidal spheres for the fabrication of colloidal crystals (CCs) using the horizontal deposition method was investigated. Solvents containing water and ethanol of different volume fractions were examined. Samples were characterized using scanning electron microscopy and UV–vis–near-infrared spectroscopy techniques. It was found that the...
A series of brookite and anatase TiO 2 hybrids with different ratios were synthesized by in situ hydrolysis of tetrabutyl titanate (TBOT) on the pre-prepared brookite nanoflowers. The composition and content of the mixture were examined by X-ray diffraction (XRD). The morphology and construction of the hybrids were examined by scanning electron microscopy (SEM), transmission electron microscopy...
A method for the fabrication of PEDOT–PSS film modified interdigitated electrode by integrating inkjet printing with electroless plating technique is reported. Palladium nanoparticles stabilized in water by styrene-N-isopropylacrylamide oligomer (St-co-NIPAAm) are inkjet printed onto a flexible PET surface to create the catalytic sites, onto which nickel is subsequently deposited by an electroless...
This article reports the preparation of gold plasmonic transducers using a nanoparticle self-assembly/heating method and the characterization of the films using scattering-type scanning near-field optical microscopy (s-SNOM). Nanoparticle-polymer multilayer films were prepared by the layer-by-layer assembly on glass slides by alternating exposures to monodisperse Au 25 nanoparticles and ionic...
In the present paper, the conditions required to improve the drug loading efficiency in biodegradable polymer particles prepared using the particular technique of freezing the inner water phase of the primary emulsion before preparation of the secondary emulsion were successfully optimized. The optimal freezing temperature for the inner water phase in the primary (w 1 /(o 1 +o ...
Elastic colloidal crystal films with brilliant color and good elongation properties were simply fabricated by depositing P(MMA-BA) copolymer spheres. Distinguished from conventional elastic colloidal crystal films formed by a core–shell spheres with a hard core and a soft shell, the film was derived from pure soft spheres, thus it can withstand elongation by no less than 500%, benefiting from the...
Here we report a novel approach for the use of hydrogel nanoparticles as effective carriers in transdermal delivery systems. Hydrogel nanoparticles, sized of 37nm at dried state, were synthesized via a crosslinking reaction between hyaluronic acid (HA) and polyethylene glycol. Depending on the type of dispersion medium, we found the hydrogel nanoparticles showed different abilities to penetrate into...
Pickering oil-in-water (o/w) emulsions, with equal volumes, stabilised solely by partially hydrophobic silica nanoparticles (80% SiOH) were destabilised by changing the pH of either the silica dispersions before emulsification or that of the freshly prepared emulsions. It was found that the aqueous silica dispersions were unstable at pH<4.2 in accordance with classical DLVO theory. When the pHs...
Molecular simulation studies were performed to explore the properties of functionalized Mg–Al layered double hydroxides (LDHs). Using molecular dynamics (MD) simulations, the intercalation of photoactive dyes (methyl orange, MO) into a Mg:Al 2:1 LDH system were studied, for which some limited experimental data have been reported (J. Colloid Interface Sci. 2008, 318, 337). The interlayer structure,...
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