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Amphiphilic surface-functionalized titania nanoparticles were prepared in a Pickering emulsion applying hydrophobic or hydrophilic agents containing a phosphonate anchor group. The Pickering emulsion approach allows for the formation of anisotropic nanoparticles with a high degree of surface-functionalization that mimic the behavior of surfactants. Therefore, the efficiency of the formed particles...
The hybrid coagulation–microfiltration process has been used for water treatment plants. However, membrane fouling is still the major barrier for its application. In this study, the impact of interactions between natural organic matter and particles on fouling has been investigated. The model substances were kaolin, humic acid and aluminum as the coagulant. The results demonstrated that flux was almost...
The pyridine-2-azo-p-dimethylaniline (PADA) ligand presents two acid dissociation constants, being pK a1 related to the pyridinium and pK a2 related to the anilinium residue. These have been measured by spectrophotometric titrations in aqueous solutions containing either the anionic (SDS), or the non-ionic (Triton X-100) or the cationic (DTAC) surfactants. The pK ai shifts...
A series of new quaternary ammonium gemini surfactants having different ethylene oxide (EO) units as spacer linked with ester functionality have been synthesized and characterized. The self-aggregation and thermodynamic properties of these new gemini surfactants have been investigated in respect to the effect of increasing ethylene oxide spacer units. The critical micelle concentration increases with...
Considering the balance of mechanical forces across a meniscus anchored to two circular objects, we developed a CPU-friendly semi-analytical algorithm for tracking the instantaneous shape and position of the air–water interface inside microstructures that resemble a collection of disordered parallel cylinders, e.g., a bundle of fibers in a fiber-reinforced composite or microfabricated posts in a microfluidic...
The interactions of Gemini surfactants 1-dodecyl-N,N′-[(1,4-dioxo-1,4-butanediyl)bis(oxy-2,1-ethanediyl)]bis[N,N′-dimethylammonium]dibromide (12-su-12) and 1-dodecyl-N,N′-[((2E)-1,4-dioxo-2-butene-1,4-diyl)bis(oxy-2,1-ethanediyl)]bis[N,N′-dimethylammonium]dibromide (12-fo-12) and the corresponding single-chain surfactant 1-dodecyl-N-[2-(acetyloxy)ethyl]-N,N-dimethyl ammonium bromide (DTAAB) with bovine...
In the current investigation, we report a facile preparation of a series of novel g-C 3 N 4 /BiOCl x Br 1−x hybrid photocatalysts and their enhanced photoactivity under visible light irradiation. The physicochemical and optical absorption of as-prepared g-C 3 N 4 /BiOCl x Br 1−x were characterized by means of X-ray diffraction (XRD),...
The effects of different formulations on the physicochemical properties of unloaded and carboxylic acid-loaded niosomes are studied. Citric acid and lactic acid were the model carboxylic acids employed. The niosomes were prepared by ultrasonication of different formulations in a phosphate buffer at pH 2 and 7 containing Tween 80 (polyoxyethylene (20) sorbitan monooleate) and cholesterol as the vesicle...
The ternary system consisting of ethyleneglycol (EG), an ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate, [Bmim][PF 6 ]) and a nonionic surfactant (p-(1,1,3,3-tetramethylbutyl)phenoxypolyoxyethyleneglycol, TX-100) was studied by dielectric measurements in the frequency range from 40Hz to 110MHz. A remarkable dielectric relaxations caused by interfacial polarization was observed...
This article describes the results from low temperature studies of the photoluminescence (PL) from colloidal CdSe nanocrystals prepared by the hot injection method in liquid paraffin. The synthesized nanocrystals were taken from the reaction mixture at different time intervals, their sizes were all within the quantum confinement range, and showed the typical size-dependent UV–vis absorption, PL and...
Thermotropic properties of catanionic surfactants are influenced by the headgroups as well as hydrocarbon chains. A series of eight catanionic surfactants were synthesized from quaternary ammonium surfactants as the cationic counterpart and dodecylbenzenesulfonate (DBS) as the anionic counterpart and their structures and purities established. Thermal Gravimetric Analysis (TGA), Differential Scanning...
Hybrid thin biomacromolecular films were fabricated by combining the in situ formation of silver nanoparticles (Ag NPs) in gelatin and self-assembly of carboxymethyl chitosan (CCHI). The hybrid films exhibited excellent antibacterial activity toward Escherichia Coli. When the fluorescent dye 4,7-(9,9ʹ-bis(6-adenine hexyl)fluorenyl)-2,1,3-benzothiadiazole modified with nucleotide adenine and quaternary...
Surface modification of CaCO 3 nanoparticles by two kinds of anionic surfactants, such as linear alkylbenzene sulfonic acid (LABSA) and branched alkylbenzene sulfonic acid (BABSA), was investigated by a quartz crystal microbalance with dissipation monitoring (QCM-D) measurement and contact angle analysis. Basically, both surfactant systems showed the same trend in the measurements of QCM-D...
We compare different emulsification devices for the production of W/O/W double emulsions. Rotor-stator devices (colloid mill and tooth rim dispersing machine), high pressure homogenization (standard and modified process) as well as a rotating membrane system were used. For better comparability, we produce double emulsions of different oil drop sizes with each device by changing process parameters...
Uniform spherical cap shaped graphite/sodium dodecyl sulfate surfactant (SDS) micro-deposits were formed after the complete evaporation of aqueous graphite/SDS dispersion drops containing 2 and 4mM of SDS and 10, 20, 40, 60, 80 and 110mg/ml graphite micro-powder on hydrophobic surfaces such as Teflon-FEP and tridecafluorooctyltriethoxysilane coated glass slides. The shapes and sizes of the graphite/SDS...
In this study, we have investigated the colorimetric sensing of heavy metal ions, especially copper ions (Cu 2+ ) for multiple analyses using gelatin functionalized silver nanoparticles (AgNPs) and AgNPs loaded gelatin hydrogels. Gelatin functionalized AgNPs were prepared by chemical reduction of silver nitrate. The gelatin functionalized AgNPs showed concentration dependent color variation...
Just as biological behaviors that can be tuned by salt ions, salt-containing soft materials are of great importance in various fields. Here we report a supramolecular cyclodextrin gel, of which properties including gelation behavior, fiber size, thermal stability as well as mechanical strength could be well tailored by inorganic salts. The concentrations, types of alkali salts were tested and had...
Single chain pyridyl boronic acid based amphiphilic gelator, sodium salt of 2-dodecylpyridine-5-boronic acid (SDDPB) spontaneously form emulsified morphology at buffer solutions of two different pHs at low amphiphile concentration whereas closed morphology at higher concentration in presence of fructose. Retention of structure and activity of released biomolecule at room temperature has promising...
Recent studies have revealed that zinc phosphate is an important transformation product of zinc oxide nanoparticles (ZnO NPs) in the environment, and the role of soluble phosphate in the transformation of ZnO NPs to zinc phosphate has been confirmed. However, whether insoluble phosphate that exists widely in the environment can induce chemical transformation of ZnO NPs has not been addressed. Therefore,...
Polyamide 6/titanium dioxide (PA6/TiO 2 ) composite nanofibers were prepared as templates via electrospinning–electrospraying process, in which TiO 2 nanoparticles were inserted into PA6 nanofibers mat, and then PA6/TiO 2 /polyaniline (PANI) composite nanofibers were fabricated by in-situ polymerization of aniline. Structural and morphological of the prepared composite nanofibers...
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