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Aqueous silver nanocolloids were synthesized using single step and completely green biosynthetic method employing aqueous leaf extracts of Paederia foetida as both the reducing and capping agent. Crystalline silver nanoparticles (AgNPs) having average diameter (8.9±3.6)nm have been obtained. The nanocolloids are very stable and no precipitation was observed in 6 months. The absorption spectra of colloidal...
Dynamics of methanol and acetic acid (3:1, v/v) fixative sessile drop is important for metaphase chromosomal spreads in cytogenetic assays. However, it has not been well characterized by biologists from a physical science point of view. In this work, a simple optical setup was built to record the fixative drop spreading and evaporation process. Drop film thickness, cross-sectional profile and surface...
The kinetics of the adsorption of picloram (PCM) onto montmorillonite (Mt) was studied in situ by attenuated total reflectance Fourier-transform infrared spectra (ATR-FTIR). Pseudo-first-order, pseudo-second-order, intra-particle diffusion and mixed surface reaction intra-particle diffusion-controlled kinetic models were applied to the experimental results. The latter was the model that best represented...
Oleic acid-based amphiphilic surfactants were synthesized using three amino acids namely isoleucine (Ile), phenylalanine (Phe), and proline (Pro) containing aliphatic, aromatic and alicyclic moiety as polar head group. N-Oleoyl amino acids were prepared using Schotten-Baumann reaction by reacting sodium salt of amino acid with oleoyl chloride. The products were thoroughly characterized by chromatographic...
Cationic microparticles were synthesized from (3-Acrylamidopropyl)-trimethylammonium chloride (p[APTMACl]) via an inverse suspension polymerization technique. These polymeric microparticles were treated with chloride salt of metals such as CoCl 2 , NiCl 2 , CuCl 2 , FeCl 2 , and FeCl 3 in ethanol. This manuscript reports the ionic liquid (IL) microparticle as...
The phenomena of syneresis and shear densification were analysed through the sedimentation of alumina suspensions. Experiments compared cylinder settling tests with a rod inserted in a cylinder against free settling without a rod for the cases of polymer flocculated and salt coagulated suspensions. Additionally, dye intrusion was used to visualise the final bed structure to identify the influence...
A facile oil/water (O/W) modified atomized microemulsion process for the synthesis of novel poly(methyl methacrylate) (nPMMA) (core)–biosurfactant (shell) particles designed for drug delivery applications is reported. The amount of biosurfactant required was 1/35 of the monomer amount by weight and the surfactant/water ratio could be as low as 1/210. These surfactant levels are much lower in comparison...
Ordered mesoporous carbon films with a 3D pore structure (COU-3) were synthesized by a soft-templating method using resorcinol (R)/formaldehyde (F) as a carbon source and Pluronic F127 as a template agent. The carbon films were prepared by a spin-coating technique. From the results of X-ray diffraction pattern, field emission scanning electron microscope and transmission electron microscope observation,...
The colloidal stabilization in waterbased paint is poorly understood due to its complexity in composition, usually containing mixtures of particles and of surface active agents (“dispersants”). In this study we make a step forward by analyzing the competitive adsorption of a few widely used dispersants on a typical inorganic pigment (70nm sized Fe 2 O 3 -based red pigment; surface...
Stable sand–propylene glycol nanofluids were formulated by dispersing sand nanoparticles (20–25nm) produced by stirred bead milling, in propylene glycol through extended probe ultrasonication. The viscosity of sand–propylene nanofluids decreases with nanoparticle concentration (0–2vol%) and temperature (29–140°C). In the well-dispersed nano-sand–propylene glycol dispersion, interactions between nanoparticles...
A systematic study of “coffee-ring” formation dynamics was carried out using chemically and physically well-controlled substrates and colloids. Clean silicon wafers were reacted with tris(trimethylsiloxyl)chlorosilane in the vapor phase to yield molecularly smooth substrates with advancing and receding contact angles up to 84°/74° (θ A /θ R ) and a constant hysteresis of 12±2°. Monodisperse...
The weak polyelectrolyte sodium polyacrylate, NaPA, and the neutral poly(vinyl pyrrolidone), PVP, were combined and the effects of complexation both in solution and at the nanoparticle interface were studied under basic pH conditions. Using a combination of SANS and PCS, we demonstrate that attractive inter-polymer interactions occur between PVP and NaPA in solution (for polymers with molecular weights...
Oil-in-water mini-emulsions are finding increasing use as delivery systems to encapsulate lipophilic bioactive components such as drugs, vitamins, and nutraceuticals in functional food, personal care, and pharmaceutical products. Like all emulsions, mini-emulsions are thermodynamically unstable systems that breakdown over time. We investigated the influence of organic and aqueous phase composition...
Monolayers of a new hybrid compound having two linearly coupled subunits with different functionalities were prepared on the silicon oxide and silicate-like surfaces using trichlorosilane as an anchoring group. The two subunits of the hybrid compound are a perfluorinated alkyl chain and an oligoethylene glycol chain. The synthesis of the new precursor compound, O-methyl hexaethylene glycol-icosafluorododecandiol-trichlorosilane...
The balance of van der Waals and electrostatic forces between the platelets in clay suspensions may lead to stable face–edge configurations. These configurations compete with face–face and edge–edge aggregates in clay gels. For clay platelets with thicknesses substantially larger than the interaction range, stability conditions for the different aggregates in terms of electric surface potentials,...
The facile preparation of nonspherical raspberry-like particles composed of a polystyrene (PSt) core and polydopamine (PDA) nodules was described. Various polymerization parameters influencing the PDA nodules were investigated in detail. It was found that raspberry-like particles were obtained in a 1:1 water/methanol solution in the presence of compounds with carboxylic acid groups, e.g., caffeic...
The vanadium oxides (VO x )/graphene hybrid materials constructed from 2D graphene nanosheets (GNS) and VO x are successfully prepared by a simple two-step procedure including solvothermal method and subsequent thermal treatment. Effects of the GNS content and the annealing temperature on the microstructure and morphology of as-obtained composites are characterized by X-ray diffraction...
Branched Polyethyleneimine (PEI) is biocompatible material and has strong adsorption towards heavy metal ions for abundant amount of primary, secondary and tertiary amine. Spectral response of PEI towards different heavy metal ions was investigated in aqueous solution by UV–vis spectrophotometry. It was found that Cu 2+ , Co 2+ and Cr 3+ could be selectively recognized by PEI...
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