Materials Literature
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An irresponsive but very hydrophobic molecule--fluoroalkylsilane--can be used to cooperate with PNIPAAm to obtain tunable and enhancedly responsive wettability, and thus largely extend the application scope of PNIPAAm film.
A simple mix and shake procedure in aqueous solution from water-soluble tetrakis(4-sulfonatophenyl)porphyrin and spermine leads to fractal non-covalent supramolecular systems which exhibit unusual large enhancement of resonant light scattering, behaving as metal particles.
The new alloys of the La–Mg–Ni (Ni⁄(La+Mg)=3–4) system absorb and desorb hydrogen at room temperature, and their hydrogen storage capacities are greater than those of conventional AB5-type alloys. We investigated the crystal structures of the La0.7Mg0.3Ni2.5C00.5 (alloy T1) and the La0.75Mg0.25Ni3.0C00.5 (alloy T2) us…
The formation of colloidal gold at room temperature was studied in a micro-reaction system. Ascorbic acid and Fe(II) were used as reducing agents. Besides citric acid, sodium metasilicate and poly(vinyl alcohol) were added as effectors for the formation of nanoparticles. The experimental set-up was based on a 2 + 1 +…
The inhibition of the oxygen reduction reaction (ORR) on copper was investigated after pretreatment with Co, Ce, and Mo ions at applied potential simulating galvanic coupling to AA2024-T3. Specifically, the effect of Ce(III), Co(II), and pretreatments on ORR was investigated in the mixed charge transfer, mass transpor…
Flavylium compounds can conveniently be encapsulated in water permeable cross-linked poly(2-hydroxyethyl methacrylate) (PHEMA) polymer hydrogel matrices. The polymer is also permeable to gases, for example ammonia and hydrogen chloride. The ability of the polymer to concentrate water from the surrounding atmosphere wa…
The dispersion and UV‐VIS properties of nano‐SiO2, nano‐TiO2, and nano‐ZnO particles in solvent‐based acrylic or polyester based polyurethane coatings and water‐borne acrylic latex coatings studied in our laboratory are reviewed. The dispersion of nanoparticles depends on the type of nanoparticle, coating system, mixi…
We present the design, analysis and characterization of a polarization-independent tunable resonant grating filter. Polarization independence is achieved by setting the plane of incidence parallel to the grating grooves and optimizing the fill factor to obtain a strong reflection peak for all incident polarization sta…
Research on hydrogen separation membranes is motivated by the increasing demand for an environmentally benign, inexpensive technology for separating hydrogen from gas mixtures. Although most studies of hydrogen separation membranes have focused on proton-conducting oxides by themselves, the addition of metal to these…
The dynamical density functional theory of Marconi and Tarazona (1999 J. Chem. Phys. 110 8032), a theory for the non-equilibrium dynamics of the one-body density profile of a colloidal fluid, is applied to a binary fluid mixture of repulsive Gaussian particles confined in a spherical cavity of variable size. For this…
Araloside A, a potent inhibitor of gastric lesion and ulcer formation in rats, was isolated from the root bark of Aralia elata through a bioassay-guided separation procedure. The compound exhibited significant reduction of HCl.ethanol-induced gastric lesions and aspirin-induced gastric ulcers at oral doses of 50 and 1…
We have used the concept of 2D building blocks and optimization methods to design (i.e., predict) the composition and the structure of four hypothetical compounds: BaFZnP, BaFZnSb, BaFMnP and SrFZnP. With a high temperature ceramic method and/or a metathesis reaction we have then succeeded to synthesize these compound…
We present the results of ab initio DFT plane wave periodic structure calculations of the LaMnO3 (001) surface. The effects related to three different kinds of pseudopotentials, the slab thickness, magnetic ordering, and surface relaxation are studied and discussed. The antiferromagnetic surface lowest in energy (that…
A polyethylene/montmorillonite(MMT) nanocomposite was prepared by in situ polymerization method using MMT-supported methylaluminoxane(MAO) cocatalyst and/or Cp2ZrCl2 catalyst. The catalyst components had been supported on the unmodified MMT-Na and modified commercial product, Cloisite 25A. With XRD it was found that t…
A new method of Standard Porosimetry (MSP) for investigation of any type of porous materials, including soft, frail, amalgamated materials, films and powders has been developed. The method is relatively simple and non-destructive and can be used for measurements in a wide range of pore sizes from 0.3 nm to 3×106 nm. T…
Multi-stage mass spectrometry (MSn) on [(M + Ag - H)x + Ag]+ precursor ions (where M = an amino acid such as glycine or N,N-dimethylglycine) results in the formation of stable silver (Ag3+, Ag5+ and Ag7+) and silver hydride (Ag2H+, Ag4H+ and Ag6H+) cluster cations in the gas phase. Deuterium labelling studies reveal t…
Transparent conductive, Al-doped ZnO films (ZnO:Al) have been deposited by means of an atomic layer deposition method with the surface chemical compositions of ZnO (film A) and Al 2 O 3 (film B). The sheet resistance, surface work function, and structure characteristics of ZnO:Al films have been investigated. Organic…
We applied catalytic oxidation using TEMPO (2,2,6,6 tetramethylpiperidine-1-oxy radical), sodium bromide, and sodium hypochlonte to aqueous kraft pulp slurries at pH 10.5 under various conditions at room temperature to chemically modify pulp fiber surfaces. This TEMPO mediated oxidation can effectively introduce aldeh…
In our endeavor to improve the cyclic stability of La-Mg-Ni-Co type alloys, hydrogen storage alloys were prepared and the structure and electrochemical properties of these alloys were investigated systematically. X-ray diffraction and Rietveld analyses revealed that the major phases are the phase and the phase. Electr…
Two azide-bridged chiral Cu(II) compounds, [Cu(R,R-dacy)(N3)2]n (R,R-dacy = trans-(1R,2R)-diaminocyclohexane) and [Cu(S,S-dacy)(N3)2]n (S,S-dacy = trans-(1S,2S)-diaminocyclohexane), with two-dimensional layer structures exhibiting end-to-end and end-on azide bridging patterns, were prepared and among them was examined…