Colloids and Surfaces A: Physicochemical and Engineering Aspects
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The effects of a homologous series of sodium p-n-alkylbenzoate hydrotropes in water-in-supercritical CO 2 (w/c) microemulsions have been investigated, by comparing the phase behaviour and droplet structures obtained using small-angle neutron scattering (SANS). The w/c microemulsions appeared to be generally stable upon addition of hydrotropes, however, on increasing the alkyl chain length...
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This article describes synthesis and stimuli-responsive behavior of dual stimuli-responsive copolymers (PNIMG) composed of temperature-responsive poly(N-isopropylacrylamide) (NIPAAm) and photo-responsive poly(cyano malachite green) (CMG). The PNIMG copolymer was regularly and uniformly layer-by-layer deposited with poly(acrylic acid) (PAA) onto solid substrates via hydrogen bonding between carboxylic...
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Ce-doped NiAl/layered double hydroxide was coated at activated carbon by urea hydrolysis method (CeO 2 -NiAl-LDHs/AC) in one pot, which was characterized by X-ray diffraction, infrared spectra, field emission scanning electron microscope and electrochemical techniques. CeO 2 -NiAl-LDHs/AC shows good uptake for aqueous sulfur dioxide (483.09mg/g) and hydrogen sulfide (181.15mg/g), respectively...
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Take full advantage of the high adsorption capability of tartaric acid (TA) and high stability of multi-walled carbon nanotubes (MWCNTs) in organic/inorganic solvents, TA modified MWCNT (MWCNT-TA) was prepared and its adsorption properties for bivalent copper ion [Cu(II)] were studied. The MWCNT-TA composites were confirmed by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and...
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Elemental mercury (Hg 0 ) is a widespread concern due to its high toxic and long residence time in the environment. Ag/graphene composite was synthesized as a high efficient and recyclable sorbent for Hg 0 removal. Ag particles were doped on the surface of graphene by a facile in situ chemical synthesis method. FTIR, XRD, and TEM results showed that Ag nanoparticles successfully grew...
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We report the design and fabrication of smart polydiallyldimethylammonium chloride (PDDA)/polyacrylic acid (PAA) multilayer coatings with enhanced stimuli responsive self-healing and anti-corrosion ability for 430 stainless steel (SS). The multilayer coatings were prepared by layer-by-layer (LBL) technique, which allows a fine control over layer numbers (n) and coating thickness. The dependence of...
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Micro-spinbars with uniform aspect ratios were fabricated from gelatin using a simple fluidic device based on water-in-oil emulsion for fluid mixing. Aqueous gelatin solution containing magnetic nanoparticles and toluene solution were used as the discontinuous and continuous phases, respectively. The gelatin droplets with uniform aspect ratios formed within the glass capillary tube of the fluidic...
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Mesoporous silica with controlled pore structure was prepared from bagasse ash as a silica source. The silica in the bagasse ash was dissolved by NaOH solution to produce sodium silicate precursor for the mesoporous silica, with or without polyethylene glycol (PEG) template. Without the PEG template, the pore structure was greatly influenced by the pH and the presence of Na + ions. The porous...
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The absorption spectra and protolytic equilibrium of a set of acid–base indicators and solvatochromic dyes have been studied in aqueous solutions of the cationic surfactants possessing two long hydrocarbon tails. In water, the double-chained surfactant di-n-tetradecyldimethylammonium bromide, DTDAB, forms large-sized anisometric self-assembled aggregates or bilayer (vesicle) type. The anionic dyes...
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Surfactants are used in chemical enhanced oil recovery (cEOR) to increase the capillary number by decreasing the oil/water interfacial tension (IFT). In this work, carboxybetaine based amphoteric and propoxylated anionic surfactants were evaluated for application in cEOR. Thermal stability of the surfactants was assessed using a novel approach based on FTIR, NMR and TGA analyses. The anionic surfactant...
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In this study novel copolymer hydrogels based on methacrylic acid (MAA) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) were synthesized by free-radical aqueous copolymerization and characterized. Derived P(MAA-co-AMPS) hydrogels, joining well the affection of numerous anionic groups toward cations and the accessibility of active sites in the swollen network were recognized as potential sorbents...
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Arundo donax Linn-based resin (ADI-resin) and Arundo donax Linn-based activated carbon (ADI-AC) were prepared for phosphate elimination from stream. Characteristics (BET surface area, Zeta potential, SEM, FTIR, and Raman spectra) of the biosorbents indicated that some required functional groups have been grafted onto the ADI-resin. The regenerated ADI-resin achieved 92–94% of adsorption capacity even...
