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A series of long chain water soluble cationics have been synthesized by reacting β-hydroxy-γ-alkyloxy bromo or chloro ethers with N-methylimidazole. The surface activity of the molecules has been determined by measurement of their conductance and surface tension in aqueous solution. The dynamics of surface activity of these surfactants have also been investigated in the presence of sodium halides,...
An aggregate may undergo a restructuring that leads to a change of its porosity. The cause of this morphology change is not only the colloidal forces between the primary particles but also the interaction between the primary particles and the flowing fluid. We investigate in this paper the restructuring of the aggregates with Van der Waals forces between the primary particles in the presence of the...
We have proposed a tensile rheological study of silica nanoparticle monolayers at the air–water interface. The surface pressure of the layers exhibits significant oscillation and forms a series of sharp downward peaks in the indentation and ascending cycles of a titanium cone. The oscillation amplitude of surface pressure dΠ is resulted from the tensile deformation of the particle layer and reflects...
In order to improve the compatibility between poly(ethylene terephthalate) (PET) and carbon black (CB), CB was modified with a titanate coupling agent, tris(dodecylbenzenesulfonato-kO)(2-propanolato)– (NDZ-109) by means of solid and liquid state, respectively. The graft of NDZ-109 on CB was confirmed by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and contact angle...
The spontaneous motion of a nitrobenzene droplet combined with iodine and potassium iodide on an aqueous phase containing a cationic surfactant (stearyltrimethylammonium chloride) was activated by the addition of a small amount of chlorobenzene into the droplet. The highest speed of droplet motion was observed when it was composed of 60% nitrobenzene and 40% chlorobenzene. To explore the factors affecting...
Conductive polypyrrole/TiO 2 nanocomposites were successfully prepared by surface molecular imprinting technique (MIP-PPy/TiO 2 ) using methyl orange as template molecule. The samples were characterized by means of SEM, XRD, BET and UV–vis diffuse reflectance spectroscopy. Compared with conductive polypyrrole/TiO 2 nanocomposites which were prepared by in situ method (Control-PPy/TiO...
Water-soluble polymer–surfactant nanoparticle complexes were prepared using double-chain anionic surfactant sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and random copolymers (RCPs) synthesized from methoxy poly(ethylene glycol) monomethacrylate (MePEGMA) and (3-(methacryloylamino)propyl)trimethylammonium chloride (MAPTAC). Polymer–surfactant interaction between the positively charged polymers and...
The amphiphilic comb-like copolymer, poly(styrene-co-maleic anhydride)-g-(poly(ethylene glycol) monomethyl ether) (SMA-M), was prepared by one-pot method. Its aggregation behavior was investigated by equilibrium surface tension method, rheological technology and transmission electron microscopy (TEM). The equilibrium surface tension of SMA-M solution with various pH at different temperatures was plotted...
An aqueous reduction method was successfully used to prepare Bi nanoparticles at 90°C with bismuth nitrate pentahydrate [Bi(NO 3 ) 3 ·5H 2 O] and sodium-hypophosphite (NaH 2 PO 2 ·H 2 O) as reactants. The diameters of Bi nanoparticles were controlled in the range of 10–50nm under varied experimental parameters. And Bi nanobelts can also be constructed...
We reported the preparation and properties of liposome-loaded polycaprolactone microspheres (LPMs) as a drug delivery system for controlling the release of flurbiprofen. LPMs were fabricated using double emulsion solvent extraction/evaporation method and characterized by scanning electron microscopy, Fourier transform infrared spectrum, X-ray diffraction, differential scanning calorimeter and UV–vis...
The effects of adsorbed ethylenediaminetetracetic (EDTA), nitrilotriacetic (NTA) and (S,S)-ethylenediamine-N,N′-disuccinic (EDDS) acids on the yield stress of α-Al 2 O 3 suspensions were evaluated to determine the nature of the inter- or intra-molecular forces responsible for the type of surface forces operating in the suspension. The conformational structures of the adsorbed additives...
The complexation of soybean peroxidase (SBP) with thermosensitive poly(N-isopropylacrylamide-co-sodium styrene sulfonate) (P(iPA-co-SSS)) has studied by laser light scattering. The SBP/P(iPA-co-SSS) complex was found to form at 20°C in a pH 2.0 solution by way of electrostatic interaction. The effect of temperature, pH, and ionic strength of the solution on the complexation process was investigated...
Hybrid films of nitrogen-doped titania nanosheets and hematite nanocubes were fabricated successfully via layer-by-layer assembly method. The morphological and structural properties were studied by scanning electron microscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Scanning electron microscope (SEM) images confirmed that hematite nanocubes were deposited randomly between...
A new method has been proposed to realize the visual detection of Hg 2+ via anti-aggregation of gold nanoparticles (Au NPs). The positively charged Au NPs were prepared using poly(diallyldimethylammonium) chloride (PDDA) as reducer and stabilizer. In the presence of cysteine, the color of Au NPs solution turned from ruby red to royal purple, indicating the aggregation of Au NPs. Owing to the...
A facile one-step approach to fabricate nylon-6 nanofibers decorated with silver nanoparticles by electrospinning has been reported. The method did not need post-treatments and could be carried out at ambient room condition. It employed the electrospinning solvents [formic acid and methoxy poly(ethylene glycol)] as a reducing agent for the conversion of AgNO 3 into Ag NPs during the solution...
In this paper, we report a novel, efficient and versatile process to produce high concentrations of silver nanoprisms, while controlling their size (prism height) and size dispersity, using a “modified polyol process” (microwave-assisted process). If the formation of silver spherical particles, nanocubes or nanowires has already been reported using the classical polyol process (reduction of AgNO ...
This paper describes a preparation method for a highly stable magnetite nanoparticle clusters (MNPCs) dispersion using crystalline lipid nanotubes (LNTs). LNTs were used as a coating material owing to their crystallinity. Oleic acid (OA) was employed as a co-dispersant to enhance the dispersibility of the glycolipid-modified MNPCs. The combination of two lipids was effective in producing a stable...
Herein, we report the interactions of serum albumins (SA) (human serum albumin (HSA) and bovine serum albumin (BSA)) with biocompatible silica coated silver nanoparticles synthesized via a simple environmentally benign synthesis, using N-[3-(trimethoxysilyl)propyl]-ethylene diamine (EDAS) as a reducing/stabilizing agent. The synthesized silica coated silver nanoparticles (Ag-EDAS) were well characterized...
This paper reports a new technique that grafts poly (ethylene glycol) (PEG) onto polydimethylsiloxane (PDMS) to enhance the cohesion and water lubrication performances of PDMS. The technique employs a two-step hydrosilylation, using vinyl PEG, poly(methylhydrosiloxane) (PMHS), and poly(methylvinylsiloxane) (PMVS). Characterization of the hydrosilylation process was performed with attenuated total...
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