Materials Literature
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Numerical self-consistent field theory is used to study the structural characteristics of a polymer brush consisting of end-grafted comb-polymers. A comb-polymer brush is shown to retain the parabolic density profile characteristic of the unbranched brush. Increasing either the number of branches or the length of the…
The preparation of porous, i.e., high surface area electrodes from transparent conducting oxides, is a valuable goal in materials chemistry as such electrodes can enable further development of optoelectronic, electrocatalytic, or bioelectronic devices. In this work the first tin-rich mesoporous indium tin oxide is pre…
Laser-induced voltages in incline-oriented thin films of thermoelectric Ca${}_{x}$CoO${}_{2}$ have been investigated at four laser wavelengths. Large film in-plane voltage signals, several tens of volts, were identified at each wavelength regardless of the occurrence of interband optical transition. The thermal model…
Abstract ZnO nanocrystallites have been in situ embedded in cellulose nanofibers by a novel method that combines electrospinning and solvothermal techniques. Zn(OAc) 2 /cellulose acetate (CA) precursor hybrid nanofibers with diameter in the range of 160–330 nm were first fabricated via the electrospinning technique us…
Magnesium potassium phosphate cement (MKPC) is usually produced by using dead burned MgO and potassium dihydrogen phosphate. A new MKPC was prepared by using combination of potassium dihydrogen phosphate (KH2PO4) and disodium hydrogen phosphate (Na2HPO4·12H2O) in certain ratios instead of potassium dihydrogen phosphat…
We report the observation of enhanced Raman intensity of the phonon modes of nanosized semiconductor particles induced by adsorption of various molecules. This is in contradistinction to surface-enhanced Raman spectroscopy (SERS), in which the Raman lines of an adsorbate are enhanced by proximity to either a metal or…
Current SiC‐based ceramic–matrix composites (SiC–SiC CMCs) rely on carbon or boron nitride fiber–matrix interphases for toughness and flaw tolerance. However, oxidation of these interphases can be performance limiting in many CMC applications. The γ‐polymorph of the rare‐earth disilicates (RE 2 Si 2 O 7 ) is a potenti…
Using first-principles calculations, we investigate the structural and electronic properties of monolayer porous graphene (C), BN, and BC 2 N sheets. All the porous C, BN, and BC 2 N sheets with one-hydrogen passivation exhibit direct-band-gap semiconducting behaviors. The porous BN sheet has a larger band gap than th…
We report for the first time on graphene transistors that incorporate a remote plasma-assisted atomic-layer-deposited Al2O3gate dielectric that is directly deposited to chemical-vapor-deposited monolayer graphene at 100°C. Following dielectric formation, atomic force microscopy and Raman measurements show apparently u…
At present, the discrete dipole approximation (DDA) is the most popular technique to simulate optical responses from various nanoparticles, including gold nanorods with a complex morphology. However, the DDA code demands considerable computer resources and computation time if one needs orientation and ensemble averagi…
With the increase in use of nanomaterials, there is growing concern regarding their potential health risks. However, few studies have assessed the role of the different physical characteristics of nanomaterials in allergic responses. Here, we examined whether intranasally administered silica particles of various sizes…
Assembly of nanoparticles as interfacial stabilizers at oil-in-water (O/W) interfaces into microscopic suprastructures for stabilizing Pickering emulsions is an intriguing focus in the fields of chemical industry and material sciences. However, it is still a major challenge to assemble nanoscale suprastructures using…
Using first-principles calculations, we show that, in spite of its relatively low shear modulus, boron suboxide (B${}_{6}$O) is superhard because of its high shear strength of \ensuremath{\geqslant}38 GPa which originates from three-dimensional covalently bonded network of B12 icosahedral units connected by boron and…
Unique catalytic capabilities of supported bimetallic nanoparticles with synergistic functions mark them as a significant advancement in catalytic technologies. The dynamic behavior and kinetics of structural change of catalysts in the reduction and oxidation processes are fundamental issues to understand their cataly…
Heavy metal tungsten alloys have replaced lead and depleted uranium in many munitions applications, due to public perception of these elements as environmentally unsafe. Tungsten materials left in the environment may become bioaccessible as tungstate, which might lead to population exposure through water and soil cont…
In surfactant-induced, pseudomorphic transformations of submicrometer-sized nonporous spheres to mesoporous silica spheres, the surface morphologies of the products depend on the solvent used during the initial Stöber synthesis. After hydrothermal transformations employing cetyltrimethylammonium bromide (CTAB) as a su…
Dilatometry experiments on low- and high-density amorphous ices up to 0.30 GPa are presented together with powder x-ray diffraction data. Repeated isobaric heating and cooling cycles reveal three competing processes: irreversible (micro)structural relaxation, reversible relaxation, and (irreversible) crystallization.…
We present an inherently reproducible route to realizing high-performance SERS substrates by exploiting a high-throughput top-down/bottom-up fabrication scheme. The fabrication route employs self-assembly of amphiphilic copolymers to create high-resolution molds for nanoimprint lithography (NIL) spanning entire 100 mm…
Undulated carbon nanofiber arrays displaying a reflectance peak due to the periodic structure are prepared by thermolysis of a poly(furfuryl alcohol) precursor in a porous silicon photonic crystal template. The carbon/silicon composites act as optical sensors for organic vapors and are up to ten times more sensitive t…
The solubility equilibrium of clopidogrel hydrogen sulfate (Form I) was set up without the nucleation of Form II, as the nucleation rate of Form II is very slow under the low supersaturation. Using the laser monitoring technique, solubilities of clopidogrel hydrogen sulfate (Form I) in ethanol, 1-propanol, 1-butanol,…