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We study spreading and rheological properties of potato starch gel which is a non-Newtonian fluid. An interesting oscillatory behavior is observed when the gel spreads on a glass surface under compression. The interface at the boundary of the area of contact of fluid and solid also shows an instability. The smooth circular boundary becomes wavy when oscillations in the contact area appear. A rheological...
Nanoscopic liquid-like water films were deposited onto silica mesoporous aggregates from vapour phase at 30°C and at 0.9 P/P 0 or from water–paraffin emulsions. The water layers, surround entirely the silica aggregates, reduced their specific surface area from 136±5m 2 /g to 80±4m 2 /g, and leaved substantially unchanged their meso-porosity. No formation of nano-pores smaller...
A new insight into “polyelectrolyte effect” which referred to the reduced viscosity of polyelectrolyte upon dilution resulting from the intra-molecular electrostatic repulsion was proposed, depending on the results by the authors concerning the viscosity theory of polymer solutions through theoretical and experimental methods. The results reveal that the abnormal viscosity behaviors of polyelectrolytes...
The modification of polymer surfaces to manipulate their wetting properties is of great technological importance. It is well known that surface chemistry and topography jointly determine the nature of wetting on a surface. In this study, we show a cheap and effective process universally applicable to fabricate superhydrophobic surfaces on various polymers. The process combines sanding and reactive...
Interfacial area per surfactant molecule values at the air/liquid interface for heterocyclic and dipropylamino derivatives of zwitterionic hexadecylphosphocholine and cationic cetyltrimethylammonium bromide derivatives were calculated from surface tension measurements in NaBr and salt-free aqueous solutions. The interfacial area values were found to be in the range of 0.45–0.86nm 2 for both...
The hydrous alumina/silica double-layer surface coating of TiO 2 pigment was prepared by precipitation method under two different conditions. High-resolution transmission electron microscopy (HRTEM), Energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FTIR) as well as ζ-potential analysis were used to characterize the morphology,...
The photocatalytic degradation of water pollutants using highly ordered mesoporous TiO 2 particles is an emerging area of environmental remediation. Titania particles with a high hexagonal mesopore ordering and a large surface area have been synthesized by a new surfactant templating process that combined both the evaporation-induced self assembly method and the liquid crystal templating pathway...
Polypropylene was successfully grafted with poly (ethylene glycol) methacrylate (PEGMA) using N-vinyl pyrrolidone (NVP) as a co-grafted monomer through melting reactive grafting modification. The grafting degree of PEGMA could be obviously enhanced by the introduction of NVP at the NVP/PEGMA molar feeding ratio of 1.3. To improve the surface hydrophilicity further, hydrophilic monomers were enriched...
We studied the formation and stability of stearic acid (SA) based films on aqueous sub-phases via Langmuir trough and imaging ellipsometry experiments. The aqueous phase was based on Artificial Sea Water (ASW), a multicomponent salt solution with a total molarity of 0.53. The composition of this solution was varied via dilution (1, 10 and 100 times) and adjustment of the pH (3, 7, 10). Also water...
Herein, we reported a facile and controllable one-step process to fabricate micrometer-sized and monodisperse polystyrene/gold nanoparticles@polyaniline (PS/AuNPs@PANi) composite particles by means of the “Swelling–Diffusion–Interfacial-Polymerization Method” (SDIPM). Utilization of chloroauric acid as the oxidant for aniline monomer afforded the shell of the resultant composite particles simultaneously...
Brownian diffusion, inter-particle interactions, shear-induced diffusion and hydrodynamic lift forces all contribute to restricting the formation of concentration polarization (CP) during cross-flow membrane filtration of particles. In this study, a unified CP model was developed for the quantification of the CP formation of colloidal particles. The basic methods adopted in previous models such as...
The oscillating drop and bubble analyzer (ODBA) is an experimental set-up based on the measurement of capillary pressure under static and dynamic conditions. It allows studies of slow and fast dynamic surface and interfacial tensions, following different growing and oscillating drop or bubble protocols, as well as determination of the dilational interfacial visco-elasticity of liquid interfacial layers...
A novel polar macroporous adsorption resin (AX-1) has been applied for separation of d-lactic acid (DLA) from aqueous solutions in a fixed-bed chromatographic column. The adsorption equilibrium and kinetics were investigated experimentally. A column model was subsequently established and validated by comparison of the simulation results to the experimental data obtained at different operating conditions...
Epsilon Keggin Al 13 (K-Al 13 , AlO 4 Al 12 (OH) 24 (H 2 O) 127+ ) is often a dominating hydrolysis aluminum species in polyaluminum chloride coagulants. Another Al 13 with planar structure (M-Al 13 , Al 13 (OH) 24 (H 2 O) 24+15 ) has also been found to be effective coagulant, with higher...
Stable and oxidation resistant copper nanoparticles are prepared in aqueous phase using sodium borohydride as a reducing agent. No surfactant has been used to stabilize the sol and the sol is found to bear negative charge. The hydrosol is resistant to oxidation by atmospheric oxygen for a couple of hours. The stability and oxidation resistant found to be due to excess sodium borohydride. The aqueous...
The spontaneous formation of vesicles in an aqueous catanionic mixture, composed of a cationic surface active long-chain ionic liquid N-dodecyl-N-methylpyrrolidinium bromide (C 12 MPB) and an anionic surfactant sodium dodecyl sulfate (SDS), is investigated. The phase behavior of catanionic system is studied and the phase diagram is mapped through visual observation and electrical conductivity...
One-dimensional nanochains consisting of crystalline iron–nickel nanoparticles were successfully synthesized by a simple cetyltrimethylammonium bromide (CTAB) mediated assembly method. The structure and magnetic properties of the nanochains were investigated. The product is composed of nanochains with a diameter of about 90–110nm and length about several micrometers. A possible formation mechanism...
This study aims to present the fabrication of colloidal photonic crystals (PCs) doped with perylenediimide (PDI) derivatives. Monodisperse PDI doped core–shell polymer particles have been obtained by employing a soap-free emulsion polymerization process of styrene and 2-hydroxyethylmethacrylate with the chromophore solubilized in the organic phase. The obtained polymer colloids allowed the fabrication...
A new series of trigonal Schiff base amphiphiles with symmetric aromatic cores and different substituted headgroups were designed and their interfacial assemblies were investigated. When on the metal ions subphases, an in situ coordination can occur for all compounds. The coordinated films could be transferred onto solid substrates and subsequently characterized by various spectroscopic methods such...
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