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The interaction of protein with lipid membrane as well as their assembly is of immense scientific importance in biomedical areas and others. Here we report the studies on the interaction between DPPC (phospholipid) Langmuir monolayer and the protein hemoglobin (Hb), by Langmuir–Blodgett (LB) technique at different conditions. The DPPC–Hb interaction has been studied by measuring surface pressure (π)–area...
Spreading behaviors in the reactive Sn–Bi–Cu/Ni system were investigated by the sessile drop method at temperatures ranging from 523K to 673K. Contact angles and the triple line frontier, characterized by the drop base radius R, were recorded dynamically with a high resolution CCD in an Ar–H 2 flow. Equilibrium contact angles between Sn–17Bi–0.5Cu solder and Ni substrate decrease monotonously...
The flow behavior of polymer flooding solution can not only be described simply with shear flow field, but also with convergent and extensional flow field. The extensional viscosity of polymer solutions used in polymer flooding in Daqing Oilfield was investigated with CaBER1 extensional rheometer, and the results showed that the extensional viscosity of which is much higher than shear viscosity with...
Magnetic Mg–Al layered double hydroxide was modified with citrate acid using a ion-exchange technique. It showed higher adsorption capacity for the uranium(VI) ions compared with magnetic Mg–Al layered double hydroxide without intercalating with citrate. This increasing capacity was mainly attributable to the formation of the citrate–metal complexes in the interlayer of the magnetic citrate·Mg–Al...
The drag force of a foam lamella moving along a circular tube under low pressure drop was measured experimentally. We applied a small pressure jump on one side of the lamella and followed its trajectory until this pressure jump is relaxed. The experimental trajectories were found to be significantly different from those resulted from theoretical model based on a viscous resistance of the Plateau border...
Water-soluble colloidal ZnSe quantum dots (QDs) modified by mercaptoacetic acid (MAA) were used to determinate H + in aqueous solutions by fluorescence spectroscopic technique. The results showed that the fluorescence of the water-soluble colloidal ZnSe QDs could be quenched by H + and the fluorescence intensity of the water-soluble QDs decreased linearly as the pH varied from 4.5...
This article presents the development of a microfluidic valve to be used in capillary flow microfluidic devices. The valve used the principle of electrowetting and was able to be actuated at low voltage. The valve consisted of two inkjet-printed silver electrodes which were encountered in series within a microfluidic channel. The second electrode was modified with a hydrophobic monolayer resulting...
We have prepared a series of novel modified polyoxyethylenated stearylamine surfactants from two polyoxyethylenated stearylamines (415ST, 430ST), maleic anhydride (MA), and sodium hydrogen sulfite. We measured the surface activities of these compounds in terms of their critical micelle concentrations (CMCs), effectiveness at minimizing surface tension (γ CMC ), surface excess concentrations...
Depending on the molar ratios of ZnO:B 2 O 3 :H 2 O, zinc borates can be classified into many kinds of categories. In this paper, we successfully synthesized three kinds of zinc borates (2ZnO·3B 2 O 3 ·7H 2 O, 2ZnO·3B 2 O 3 ·3.5H 2 O and 3ZnO·3B 2 O 3 ·5H 2 O) by controlling the reaction conditions, using...
The solution of ionic liquid (IL) bmimCl and polar organic solvent formamide (FA) were used to form nonaqueous microemulsions in cyclohexane by the aid of surfactant Triton X-100 (TX-100). The phase behavior of the bmimCl–FA/TX-100/cyclohexane system at 25±0.1°C was studied. Electrical conductivity measurement was used to identify the microstructures of the nonaqueous microemulsions. Based on the...
The compaction and condensation of DNA induced by cationic imidazolium gemini surfactants ([C n -4-C n im]Br 2 , n=10, 12, 14) at different charge ratios have been investigated by dynamic light scattering (DLS), zeta potential, circular dichroism (CD), and ethidium bromide exclusion assay. Upon addition of [C n -4-C n im]Br 2 , DNA molecules undergo...
A novel supramolecular organogel consisting of β-cyclodextrin (β-CD), 4,4′-isopropylidendiphenol (BPA), LiCl, N,N-dimethylformamide (DMF) and ethanol (EtOH) was prepared. The system without EtOH was a clear solution at ambient temperature and turned into an organogel upon the addition of ethanol (EtOH). The micro-morphologies of the organogel were various, such as ellipsoids, spheres, cuboids and...
The dynamics of the flocculation of precipitated calcium carbonate (PCC) with two commercial cationic tapioca starches (S858 and S880) with different charge densities were studied by small angle static light scattering. The effects of temperature, polymer dosage, ionic strength, and shear rate on the floc size and structure were investigated by employing a response surface methodology involving the...
A two-color lattice-Boltzmann method (LBM) was used for simulation of the behavior of droplets deposited on a fiber. The interaction of the droplet with the gas flowing around a fiber having smooth and rough surfaces was analyzed. The equilibrium of conformation of droplets and their velocities were derived. The results of the calculation show the distinguished patterns of the interaction depending...
The superparamagnetic carboxymethyl chitosan nanoparticles (Fe 3 O 4 (PEG+CM-CTS) NPs) which prepared by chemical coprecipitating were treated with Cu(II) and Zn(II) ions solutions to obtain the novel immobilized metal affinity magnetic nanoparticles (IMANs), short as IMAN @ Cu(II) NPs and IMAN @ Zn(II) NPs. Immobilization of trypsin onto the obtained IMANs, as a result of metal affinity...
Rheological measurements as a function of temperature have been carried out on a micellar-ionic liquid (4.45wt% sodium dodecylsulfate (SDS) in 1-butyl-3-methylimidazolium chloride (BmimCl)) with 18.7wt% lithium chloride (LiCl). We report here for the first time, the formation of a “weak gel” state at high temperatures (>80°C) based on elastic and loss moduli behavior and yield stress measurements...
The electrochemically reductive dechlorination of 2,4-dichlorophenol (2,4-DCP) in aqueous solution on palladium/polymeric pyrrole–sodium dodecyl sulfonate film/meshed titanium electrode (Pd/PPy–SLS/Ti electrode) was investigated in this paper. The Pd/PPy–SLS/Ti electrode was prepared by electrodesposition and characterized in terms of surface morphology (SEM), structural feature (XRD), specific surface...
Using sodium caprylate as a model molecule, in the present work, we unraveled the gelation mechanism of sodium soaps in organic solvents from its correlation with the microstructure morphology. It is interesting to find that both the formation of organogels and radiation-like gel fibers are controlled by Na + concentration in the system. As the gel-activator, the sodium ions not only accelerate...
A population balance model to describe the flocculation of PCC by two cationic tapioca starches is presented. The model takes into account aggregation, floc breakage and floc restructure. Floc strength as indicated by energy dissipation rate was also evaluated. It was found that the high charge density starch relates to lower collision efficiency, lower restructure rate and higher floc strength (higher...
The out-of-plane jumping motion of coalesced condensed drops on super-hydrophobic surfaces can potentially enhance dropwise condensation greatly. But the jumping mechanism is not clear. In this paper, the initial shape of a coalesced droplet is determined based on the conservation of drop interface free energy (IFE) and viscous dissipation energy before and after two or more condensed droplets merge...
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