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Calixarenes are promising compounds to be used as ionophores and for molecular recognition. Their ability to form Langmuir and Langmuir–Blodgett (LB) films is of great interest in order to obtain small sensor devices which incorporate an active nanometric film. The p-tert-butylcalix[7]arene ethyl ester compound has been synthesised and its ability to form Langmuir and LB films has been shown. This...
Secondary pollution is the main problem facing wide applications of the nanostructural photocatalysts. In other words, most of the reported nanostructural photocatalysts might effectively eliminate the organic pollutants; however they create a serious issue due to the separation difficulty of the utilized nanostructural photocatalysts from the treated water especially in the case of large scale processes...
A novel and facile electroless galvanic deposition approach is developed to fabricate superhydrophobic surface on steel substrates. The copper coated steel surfaces show hierarchical micro-nano structures similar to that of lotus leaf. After modified with perfluorooctyltriethoxysilane, the resultant surface shows robust superhydrophobicity with long-term stability. Moreover, the as-obtained fluoridated...
The saturated and monovacant Keggin unit functionalized titania materials, H 3 PW 12 O 40 /TiO 2 and K 7 PW 11 O 39 /TiO 2 , were prepared by one step sol–gel co-condensation followed by solvothermal treatment. The structure, optical absorption properties, morphology, and porosity of the materials were well characterized. Subsequently,...
In order to obtain magnetic nanoparticles (NPs) coated with small biomolecules, histidine (His)-coated iron oxide (His-Fe 3 O 4 ) and cobalt ferrite (His-CoFe 2 O 4 ) with a polycrystalline structure were prepared by a simple liquid deposition method at room temperature. The growth mechanism for His-Fe 3 O 4 and His-CoFe 2 O 4 NPs was...
A fast, facile one-step process was developed to fabricate superhydrophobic surfaces by electrodepositing copper substrate in an electrolyte containing lanthanum chloride (LaCl 3 ·6H 2 O), myristic acid (CH 3 (CH 2 ) 12 COOH) and ethanol. Morphology and the chemical structure and composition of the superhydrophobic surface were investigated with SEM, FTIR, XRD,...
Uniform and well-dispersed Y 2 O 3 :Eu/YVO 4 :Eu composite microspheres were prepared by hydrothermal chemical corrosion Y 2 O 3 :Eu microspheres with Na 3 VO 4 solution. Effects of pH, molar ratio of Na 3 VO 4 to the Y 2 O 3 :Eu precursor (R), and reaction time (t) on the morphology and the crystal structure of...
A series of novel graphene oxide (GO)/poly(acrylic acid-co-acrylamide) super-absorbent hydrogel nanocomposites were prepared by in situ radical solution polymerization. The effects of GO content on the chemical structure, morphology and miscibility of the hydrogels were studied. The swelling behaviors, swelling kinetics and pH-responsive behaviors of the hydrogels were also evaluated. Owing to the...
Two new solvent exchange methods for synthesizing water-stable colloidal aggregates of C 60 are presented. These methods combine key advantages of multiple existing syntheses, including high yield, narrow particle size distribution, potential for control of mean particle size, short synthesis time, and an absence of solvents such as tetrahydrofuran that have historically caused problems in...
An experimental study was carried out to investigate the motion, deformation and breakup of charged water droplets in the presence of electric field. A typical nozzle-ring electrode apparatus was conducted consisting of a nozzle employed as high voltage electrode and a metal ring as grounded electrode. Experiments were performed in silicone 100cSt oil as an insulating medium. Under influence of D...
Magnetic composite microspheres present a promising candidate for applications in bioseparation, drug delivery, and biocatalysis. We report here the synthesis of carboxyl-functionalized and core–shell structured Fe 3 O 4 /PS-PAA microspheres via a dispersion interfacial polymerization method, using styrene (St) and acrylic acid (AA) as monomers. The magnetic composite microspheres...
The relationship between the particles size distribution of colloidal crystals and the structure and physical properties of the resulting 2D colloidal crystals is presented in this work. The colloids were constituted of silica sub-micron spheres with different size distributions comprised between 150 and 520nm, synthesized by the Stöber method and assembled in one monolayer through the Langmuir–Blodgett...
The impact of ionic strength and cation valence on the transport and deposition kinetics of ZnO nanoparticles in saturated porous media was systematically investigated in this research. Packed column experiments were performed over a series of environmentally relevant ionic strength in both NaCl (ranging from 1 to 20mM) and CaCl 2 (ranging from 0.1 to 1mM) solutions. Solution chemistries (ionic...
Cross-flow micellar-enhanced ultrafiltration had been used to separate pollutants from waste water effectively, while permeate flux decline with time because of the increase of fouling resistance. According to resistances in series theory, total transport resistance is the sum of two parts: membrane hydrodynamic resistance and fouling resistance. By observing material balance and hydrodynamic type...
Calcium oxalate particles with different morphologies and phase structures were prepared by a facile precipitation reaction of sodium oxalate with calcium chloride in the presence of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) at different temperatures. The as-prepared products were characterized with scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was...
The fluoride uptake by various calcium phosphate minerals is reported. Hydroxyapatite (HA), octacalcium phosphate (OCP), and dicalcium phosphate dihydrate (DCPD) were individually exposed to fluoride, and they absorbed fluoride through fluorapatite formation. The fluorapatite formation was through dissolution-and-recrystallization, and the kinetics was in the order, DCPD>OCP>HA. Polymeric additives,...
Many studies have shown that surface roughness affects the adhesion and friction forces. One effective approach of reducing adhesion and friction forces between contacting interfaces is to create textured surfaces or surface modification, which is especially beneficial for micro/nano systems (e.g. MEMS/NEMS) that normally have smooth surfaces and are subjected to small applied forces. This paper presents...
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