Materials Literature
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Superhydrophobic surfaces were produced on silicon substrates coated with gold, which facilitates the formation of SiO(2) protrusions on the Au surface in air at low temperatures. The roughness of SiO(2) increased with the oxidation period at, for example, 150 degrees C. When the SiO(2) surface is alkylated with dodec…
We study the kinetics of formation of branched loopless structures in mixtures of particles with different shapes and functionalities. These systems are treated with the appropriate Smoluchowski rate equations, including condensation and fragmentation terms, and it is shown that it is possible to provide a parameter-f…
Abstract A novel and convenient procedure is presented for bilayered encapsulation of silica, ZnO, and TiO 2 microparticles using highly adhesive unsaturated polyester, poly (2‐hydroxy propylene maleate) (PHM) and epoxidized soybean oil (ESO). Thus, adsorption of PHM onto the particle surfaces from acetone solution (u…
Abstract In this article, a novel two step synthesis of soy oil based isothiocyanate is described. Allylicaly brominated soybean oil (ABSO) was reacted first with ammonium thiocyanate in tetrahydro furan to form allylic thiocyanates. These compounds were then converted to isothiocyanated soybean oil (ITSO) by a therma…
Abstract The role of the skin and core regions in controlling the effects of V‐notches, on the fracture behavior of PET injection‐moldings, was correlated with their tensile and impact properties. Investigations revealed that there were three distinct fracture behaviors: ductile, semiductile, and brittle fracture tran…
Tensile tests of kenaf fiber with different characteristics were carried out and their potential application to the reinforcement of FRP was conducted. Specifically, the effect of stem diameter and length on the mechanical properties of kenaf fiber of different types was investigated. In addition, after converting ken…
A ligand with a bisphosphonate headgroup and methyl-terminated poly(ethylene oxide) 550 tail has been adsorbed to a boehmite (AlOOH) particle film from aqueous solutions at 9, 18, 26, and 40 degrees C with a range of coverages. In situ attenuated total reflectance infrared (ATR-IR) spectra of the PEO-modified boehmite…
Abstract A method is proposed using mean-field theories to help solve a long standing problem in the study of ionically solid electrolytes. While it has been long known that the ionic conductivity in solid electrolytes is comprised of two terms, the mobility and number of mobile charge carriers, there has been no accu…
Due to unusual spinlike properties, electrons in graphene-despite scattering-exhibit a small increase in their conductivity.
Trehalase, an anomer-inverting glycosidase, hydrolyzes only alpha,alpha-trehalose in natural substrates to release equimolecular beta-glucose and alpha-glucose. Since the hydrolytic reaction is reversible, alpha,alpha-[1,1'-(2)H]trehalose is capable of synthesis from [1-(2)H]glucose through the reverse reaction of tre…
The preparation of mesoporous silica SBA-15 with high iron loadings (14−90 wt % Fe 2 O 3 ) as a suitable support for gold nanoparticles to be used in CO oxidation catalysis has been investigated. The support materials were prepared by a direct hydrothermal two-step pH adjusting method which consisted of the formation…
We study the dynamics of water confined between hydrophobic flat surfaces at low temperature. At different pressures, we observe different behaviors that we understand in terms of the hydrogen bond dynamics. At high pressure, the formation of the open structure of the hydrogen bond network is inhibited and the surface…
We prepared thermally stable, low dielectric polymers by thermal polymerization of cyclotriphosphazenes bearing acetylene or styrene groups. Homosubstituted cyclotriphosphazene 1, containing acetylene groups, was synthesized by reaction of hexachlorocyclotriphosphazene with sodium salts of 4′-trimethylsilylethynyl-1,1…
Thin films of a delafossite compound CuScO2 were grown on spinel MgAl2O4 (111) substrates, yielding in highly crystalline and (0001)-oriented epitaxial structures. Absorption spectra at 20 K revealed a sharp exciton resonance at 3.97 eV, which persisted up to 300 K. Its direct transition band gap at 20 K and exciton b…
Zusammenfassung We discuss the origins of mixed-former effects in borophosphate glasses of general composition: Li 0.5 BO 1.75 :(1−x)LiPO 3 and 0.4 Na 2 O:0.6 [xB 2 O 3 :(1−x)P 2 O 5 ], and show how these effects relate to changing ion-network interactions. In particular for the latter system, we analyse the permittiv…
Abstract In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi 2 O 6 ) and lithium metaborate (LiBO 2 ), was examined using 7 Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were…
The magnetic phase variations under hydrostatic pressure on multiferroic ${\text{BiMnO}}_{3}$ have been examined by the dc magnetization $[{M}_{g}(T)]$, magnetic hysteresis $[{\ensuremath{\mu}}_{eff}(H)]$, and ac susceptibility $[{\ensuremath{\chi}}_{g}^{\ensuremath{'}}(T)]$. Three magnetic transitions, manifested as…
This work demonstrates that it is possible to synthesize crystallized Ge nanostructures directly in an aqueous medium under ambient conditions by using widely available GeO2 (in the form of germanate ions) as a precursor. The reaction of germanate ions with NaBH4 in an aqueous medium resulted in highly hydrogenated Ge…
Single‐crystalline KTa 0.25 Nb 0.75 O 3 (KTN) nanorods with an orthorhombic perovskite structure were synthesized via a polymer‐assisted hydrothermal method. The preferred crystallographic orientation of the nanorods were found to be controllable by using different types of polymers in the process; that is, [001]‐orie…
In this work we propose a theory to describe the irreversible diffusive relaxation of the local concentration of a colloidal dispersion that proceeds toward its stable thermodynamic equilibrium state, but which may in the process be trapped in metastable or dynamically arrested states. The central assumption of this t…