Materials Literature
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The sliding of a droplet of polystyrene solution on an inclined glass substrate is studied experimentally. The droplet shape and the sliding velocity are measured with varying the inclination angle, the droplet volume and the polymer concentration. We found that although the sliding behavior of polymer solution drople…
Molecular dynamics (MD) simulation of the structure and thermodynamic properties of liquid and amorphous Fe(2)O(3) nanoparticles, with different sizes ranging from 2 to 5 nm, has been carried out based on the Born-Mayer pair potentials under non-periodic boundary conditions. The partial radial distribution functions (…
In this paper, we introduce an idealized model of silicon nanotubes comprising an exact polyhedral geometric structure for single-walled silicon nanotubes. The silicon nanotubes considered here are assumed to be formed by sp(3) hybridization and thus the nanotube lattice is assumed to comprise only squares or skew rho…
We investigate the spatiotemporal behavior of sheared suspensions of rodlike particles with permanent dipole moments. Our calculations are based on a self-consistent hydrodynamic model including feedback effects between orientational motion and velocity profile. The competition between shear-induced tumbling motion an…
Synthesis and characterization of resorcinol-acetone copolymer is described. The polymer was prepared by trifluoroacetic acid-catalyzed polymerization of resorcinol with acetone. According to the (1)H-NMR, (13)C-NMR, and MALDI-TOF Mass spectra data, the obtained polymer had three types of repeating units: isopropylide…
Spectral properties of a recently developed voltage-sensitive dye, di-4-ANEPPDHQ, were characterized as the dye was dissolved in the solvent dimethyl sulfoxide as the stock solution, in Hank's buffered salt solution as the staining solution, and bound to the plasma membrane of primary rat hippocampal neurons and immor…
Abstract Biodegradable blends of LDPE and cellulose acetate phthalate have been prepared. Maleic anhydride‐grafted LDPE has been added as a compatibilizer to this blend. The elastic modulus and tensile strength has been considerably improved by adding LDPE‐ g ‐maleic anhydride compatibilizer. Scanning electron microsc…
Bulk-phase self-assembly of a series of semifluorinated alkanes (SFAs) with hydrocarbon chains of varying length has been investigated by 19F NMR spectroscopy. At room temperature, a single 19F resonance for the terminal sCF3 group was observed at -81.7 ppm for perfluorododecylhexane (F12H6), whereas a sCF3 resonance…
Abstract Organofunctional silanes of the type (RO) 3 Si(CH 2 ) n X, where X is a coordinating organic group, can be used to coordinate metal ions or metal alkoxide moieties (M). Sol–gel processing of the single‐source precursors thus obtained, (RO) 3 Si(CH 2 ) n XM, followed by controlled degradation of the organic t…
A phenomenological model to simulate the superelastic effect in nickel–titanium (NiTi) alloys is proposed. The model is able to simulate the stress–strain hysteretic behaviour of the material in a phenomenological way by using the Prandtl–Ishlinskii operator. The parameters of the phenomenological model are identified…
Opposites attract (selectively): Oppositely charged nanoparticles characterized by different size distributions form 3D supracrystals (see figure) only if the distributions overlap. Crystal quality decreases rapidly with decreasing degree of overlap, and, irrespective of the ratio of particle diameters/charges, no cry…
The effect of vacuum annealing on the spectral response and structure of tungsten oxide films prepared by electron beam evaporation was studied. The temperatures of WO3 and glass heated in vacuum and under solar radiation were investigated. Vacuum annealing WO3 at 450 °C for 1 h was observed to change the film from tr…
Abstract In this article, we introduce a new type of small scale compounder. The compounder developed is for mixing of polymeric samples of 0.5–10 g. It consists of a heated cylindrical metal having two cylindrical cavities connected through a narrow channel and two cylindrical pistons, which squeeze molten polymers f…
Natural gas with a high methane concentration is an important source of primary fuel for fuel cells, although it contains sulfur compounds, such as tetrahydrothiophene (THT), known as a poison for the fuel cell catalyst parts. Desulfurization of natural gas fuel in ambient conditions is thus essential before it enters…
The interaction between three poly(9,9-bis(6-N,N,N-trimethylammonium)hexyl)fluorene phenylene) bromide (HTMA-PFP) samples of different molecular weights (Mn=14.5, 30.1 and 61.3 kg/mol) and both dsDNA and ssDNA secondary structures has been studied using UV-visible absorption and fluorescence spectroscopies (including…
Abstract A new interesting class of polyurea derivatives 5 a‐c was synthesized using solution polycondensation technique by the interaction of 1 mol of 4,4′‐bis(2″‐aminothiazol‐4″‐yl)diphenyl ether monomer 3 with 1 mol of diisocyanate compounds in pyridine. The model compound 4 was synthesized by the interaction of 1…
We recently reported (Yang, J.; et al. Angew. Chem., Int. Ed. 2008, 47, 882) a novel hydrogen storage composite involving a 2:1:1 LiNH 2:LiBH 4:MgH 2 ratio. On the basis of in-depth experimental and computational analysis, this composite was found to release hydrogen via a complex multistep reaction cascade, which see…
This paper demonstrates that a fibrous, repetitive amino acid sequence collagen-related protein, a 44-kDa fragment of human collagen I alpha 1 (CIalpha1), was expressed in corn grain molecularly equivalent to that produced in recombinant yeast. The recombinant CIalpha1 was extracted and purified from early generation…
Abstract A new cardo diamine monomer 3, 3‐ bis ‐[4‐{2′trifluoromethyl 4′‐(4″‐aminophenyl) phenoxy} phenyl]‐2‐phenyl‐2, 3‐dihydro‐isoindole‐1‐one ( 4 ) has been synthesized from potentially cheap phenolphthalein as the starting material. This diamine was used for the synthesis of a new poly(ether amide) and two co‐poly…
Ion and pH effects on the phase transition behaviors are studied with a series of thermosensitive neutral and acidic poly(organophosphazene) counterparts. Poly(organophosphazenes) are substituted by hydrophobic L-isoleucine ethyl ester (IleOEt) and hydrophilic alpha-amino-omega-methoxy-poly(ethylene glycol) 550 Da (PE…