Materials Literature
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By simply adjusting the molar ratio of resorcinol (R) to formaldehyde (F) and optimizing the aging time of the gel, highly ordered mesoporous carbons (OMCs) have been synthesized under strong acidic conditions through aqueous self-assembly of R/F with triblock copolymer F127, without addition of any promoters. It was…
Silver silica nanocomposites were obtained by the sol-gel technique using tetraethyl orthosilicate (TEOS) and silver nitrate (AgNO(3)) as precursors. The silver nitrate concentration was varied for obtaining composites with different nanoparticle sizes. The structural and microstructural properties were determined by…
Dendrimers synthesized from small molecules form macromolecules of well-defined size and architecture.1 The high density of functional groups on the periphery of the dendrimers makes them useful as carriers for multiple copies of biologically active compounds for drug/vaccine delivery or probe molecules for detection…
Functionalized gold nanoparticles with complementary H-bonding groups can control the secondary structure of xerogel fibers formed by a molecular conductor thanks to their incorporation into the nanowires, which show metal-like conductivity once doped without the need for annealing. The picture shows a photograph of t…
DNA-wrapped halloysite nanotubes were obtained by a mechanochemical reaction in the solid state. The characterization by scanning electron microscopy showed that the nanotubes were cut into shorter lengths and were completely covered with DNA. This resulted in a high aqueous solubility of the product with stability of…
The cubic symmetry of octafunctional octaphenylsilsesquioxanes [ROPS, (RC6H4SiO(1.5))8] coupled with a 1 nm diameter offers exceptional potential to assemble materials in three dimensions with perfect control of periodicity and the potential to tailor global properties at nanometer length scales. OPS itself is very in…
Biominerals, especially molluscan shells, generally contain unusually acidic proteins. These proteins are believed to function in crystal nucleation and inhibition. We previously identified an unusually acidic protein Aspein from the pearl oyster Pinctada fucata. Here we show that Aspein can control the CaCO(3) polymo…
Titania (TiO 2 ) nanoparticles are widely used, or are under active development, for a range of applications in (photo)catalysis, photovoltaics, enzyme support, energy storage, and photonics. The peptide-directed room-temperature formation of titania nanoparticles can be an attractive alternative to higher-temperature…
The B--B bonding, boron--rare earth coupling, and the changes in $4f$ states across the lanthanide series in $R{\mathrm{B}}_{4}$ ($R=\text{rare}$ earth) compounds are studied using the correlated band theory $\mathrm{LDA}+U$ method. A set of boron bonding bands that are well separated from the antibonding bands can be…
The relationship between the composition, structure and properties of promising thermoelectric materials is analysed. Different classes of chemical compounds that serve the basis for the development of thermoelectrics are considered. Special attention is drawn to chemical problems associated with the design of the new…
This paper discusses the fundamental issues of the elastic properties and effective wall thickness of single-walled carbon nanotubes (SWCNTs). It provides an in-depth analysis based on the rationale of the nanoscale-to-macroscale deformation relationship of SWCNTs and carries out a critical assessment of the diverse t…
Mn Fe P 1 − x Si x compounds with x=0.10,0.20,0.24,0.28,…,0.80,1 were prepared by high-energy ball milling and solid-state reaction. The structural, magnetic, and magnetocaloric properties are investigated as a function of temperature and magnetic field. X-ray diffraction studies show that the samples in the range fro…
Highly oriented Ga-doped zinc oxide (ZnO) nanorod arrays have been prepared on a ZnO-buffered silicon substrate in an aqueous solution, which is a mixture of methenamine (C(6)H(12)N(4)), zinc nitrate hexahydrate (Zn(NO(3))(2)·6H(2)O), and gallium nitrate hydrate (Ga(NO(3))(3)·xH(2)O). The microstructure characteristic…
Recently, significant interest has emerged in fabricated systems that mimic the behavior of geometrically-frustrated materials. We present the full realization of such an artificial spin ice system on a two-dimensional kagome lattice and demonstrate rigid adherence to the local ice rule by directly counting individual…
The series of platinum acetylide oligomers (PAOs) with the general structure trans,trans-[(RO)3Ph-C[triple bond]C-Pt(PMe3)2-C[triple bond]C-(Ar)-C[triple bond]C-Pt(PMe3)2-C[triple bond]C-Ph(OR)3], where Ar = 1,4-phenylene, 2,5-thienylene, or bis-2,5-(S-2-methylbutoxy)-1,4-phenylene and R = n-C12H25 gel hydrocarbon sol…
Determination of the optical band-gap energy of cubic and hexagonal boron nitride using luminescence excitation spectroscopy, Evans, D A, McGlynn, A G, Towlson, B M, Gunn, M, Jones, D, Jenkins, T E, Winter, R, Poolton, N R J
The strain field of isolated screw and edge dislocation cores in aluminum are calculated using density-functional theory and a flexible boundary condition method. Nye tensor density contours and differential displacement fields are used to accurately bound Shockley partial separation distances. Our results of 5-7.5 A…
Numerical simulations of bubble pulsations have been performed for a system of two bubble clouds in order to study the experimentally observed bubble motion under an ultrasonic horn by high-speed video camera. The comparison between the calculated results and the experimental observation of the bubble pulsation has in…
We study the magnetic and transport properties of an all-manganite spin valve consisting of a thin antiferromagnetic and insulating manganite sandwiched between two ferromagnetic and metallic manganite electrodes. When the ferromagnetic electrodes are in a parallel configuration, the double-exchange mechanism in the m…
An attempt is made to resolve the controversy related to the low temperature phase (ground state) of the low-doped ferromagnetic (FM)-insulator manganite through bulk magnetic measurements on ${\mathrm{La}}_{0.9}{\mathrm{Sr}}_{0.1}\mathrm{Mn}{\mathrm{O}}_{3}$ sample. It is shown that the FM phase, formed out of well d…