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The vapor-phase sorption of volatile organic compounds (VOCs), i.e. n-hexane, benzene and methanol, along with sorption of their binary mixtures, i.e. benzene/n-hexane and benzene-methanol, on montmorilllonite with different water content was studied. The absolutely dry mineral did not exhibit selectivity towards the studied VOCs sorbed separately. The hydration inhibited sorption of hydrocarbons...
Nano-liposomes were prepared by the modified reverse phase evaporation method using high-speed and high-pressure homogenizers. The optimal conditions for preparation of non-coated liposome, chitosan-coated liposome, and eudragit EPO-coated liposome were investigated. The liposomal membrane was composed of soybean lecithin. Chitosan and eudragit EPO coated the external surface of liposomes by electrostatic...
The alkaline hydrolysis of two aromatic esters, 2-naphthyl acetate (2NA) and phenyl acetate (PhA) has been tackled in this work. The reaction has been followed in water and in the presence of cationic surfactants with different chain lengths: dodecyltrimethylammonium bromide (DTABr), tetradecyltrimethylammonium bromide (TTABr), and hexadecyltrimethylammonium bromide (CTABr) and the corresponding hydroxides...
In this work, we demonstrate a facile fabrication method for the synthesis of magnetic biochar composite (MBC) by using low-cost pine bark waste and CoFe 2 O 4 . Sorption characteristics of the as-fabricated MBC for the removal of both Pb(II) and Cd(II) ions were studied in batch conditions. The physical and chemical structures of the composite were characterized by Fourier transform...
New p-tert-butylthiacalix[4]arenes containing amide, ester, phthalimide and quaternary ammonium fragments in cone conformation were synthesized and characterized. The effective interaction of the p-tert-butylthiacalix[4]arenes with silver nitrate and fluorescein was shown by electron spectroscopy. As was shown by dynamic light scattering (DLS) all the macrocycles are able to form nanoscaled particles...
Alkyl chain length effects of added double-chained cationic surfactants, dialkyldimethylammonium bromides (DXDABs), including ditetradecyldimethylammonium bromide (DTDAB), dihexadecyldimethylammonium bromide (DHDAB), and dioctadecyldimethylammonium bromide (DODAB), on the Langmuir monolayer behavior of a pseudodouble-chained ion pair amphiphile, hexadecyltrimethylammonium-dodecylsulfate (HTMA-DS),...
Vesicles directly prepared from cyclodextrin–ftorafur supramolecular amphiphiles were reported. Ftorafur can be efficiently encapsulated in the cyclodextrin cavities embedded in the vesicle membrane. The morphologies and diameters of the vesicles were identified in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic light...
Physical gels have been studied as an advantageous alternative to traditional decontamination techniques, which most often rely on the use of surfactant solutions. Such physical gels consist of colloidal particles suspended in a decontaminating solution. They can be sprayed over the surfaces to be treated, where they dry and form solid disposable residues. In order to improve their efficiency, the...
Surface tension measurements of the aqueous solutions of cetyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) mixture with methanol or propanol in the whole range of alcohol concentration and in the range of surfactant mixture concentration from 1×10 −6 to 1×10 −3 M were carried out. Based on the obtained results, the surface excess concentration values of this mixture and...
The transport and retention behaviors of titanium dioxide nanoparticles (nTiO 2 ) in iron oxide-coated sand were examined in water-saturated sand columns as functions of pH, ionic strength, and humic acid. Experimental breakthrough curves and retention profiles indicated that the transport and retention of nTiO 2 in the absence of Suwannee River humic acid (SRHA) were dominated by...
We studied the water-in-oil (W/O) emulsion droplet formation in a simple coaxial microfluidic device with varying the flow rate of continuous phase and investigated the effect of the flow rate on the size and coefficient of variance of the emulsion droplets. The emulsion droplets prepared in the dripping regime at a low flow rate of the continuous phase exhibited a uniform size distribution. The increase...
The growth of PMMA [poly (methyl methacrylate)] thin film structure containing sequential depositions through Langmuir–Blodgett technique was investigated using X-ray reflectometry and atomic force microscopy. The thickness of the films as obtained from reflectivity studies shows an almost linear variation with number of strokes. The roughness of the film was also found to be increased with increasing...
For the purpose of surfactant-enhanced remediation (SER) as a means of removing polycyclic aromatic hydrocarbons (PAHs) from polluted soils, a new method of reversibly solubilizing PAHs has been developed based on modulating the surface activity of the photoresponsive surfactant 4-butylazobenzene-4′-(oxyethyl)trimethylammonium bromide (AZTMA). AZTMA undergoes reversible isomerization between trans...
Multiple emulsions have attracted significant interests for fundamental study and practical applications. However, the preparation of stable multiple emulsions is difficult in general because the emulsification often involves a two-step process as well as two kinds of surfactants are needed to stabilize the two thermodynamically unstable interfaces. Recently, we described a one-step inversion approach...
A new phase separation system, aqueous multiphase system (MuPSs, ranging from two to four phases), containing surfactants and polymer (SDS/DTAB/PEG/NaBr/H 2 O) was designed and the complicated four-phase systems were investigated systematically. To interpret the phase separation phenomena, the phase composition, phase density, phase volume ratio between the studied phase and the whole system...
This work aims at preparing thiol coated copper organosols of small size and high particle loading by using phase transfer of pre-formed particles. HCl mediated and ethanol mediated phase transfer protocols have been successfully used to transfer particles from charge stabilized and citrate stabilized hydrosols of various concentrations. To increase the concentration of particles in the organic phase...
Hydrocarbon- and fluorocarbon-based silanes were grafted onto the surface of amine-containing silica nanoparticles to achieve materials of varied surface hydrophobicity. X-ray photoelectron spectroscopy and direct polarization solid-state nuclear magnetic resonance spectroscopy were used to confirm the presence of surface-grafted functionalities. Changes in hydrophobicity were illustrated by assessing...
Rate of Brownian flocculation of polystyrene latex particles with low charge density polyelectrolyte (σ=4%, M w =5.2×10 6 g/mol) was measured by Coulter Counter as a function of the ionic strength. As reported in the case of high charge density polyelectrolyte [L. Feng, Y. Adachi, A. Kobayashi, Colloid Surf. A. 440 (2014) 155–160], the rate of flocculation goes through a maximum against...
Particle collisions in homogeneous isotropic turbulence are simulated by means of kinematic simulation (KS) and compared with direct numerical simulation (DNS). KS is a computationally efficient surrogate for DNS of flow field dynamics [23]. To determine the energy spectrum in the KS, the Reynolds-number-dependent model spectrum of Pope was applied. For the comparison, particles having Stokes numbers...
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