Materials Literature
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Time-resolved small-angle x-ray scattering measurements reveal that a long-lived intermediate bcc state forms when a poly(styrene-b-isoprene) diblock copolymer solution in an isoprene selective solvent is rapidly cooled from the disordered micellar fluid at high temperature to an equilibrium fcc state. The kinetics of…
Abstract Nanosized ZnS has been synthesized in the interlayer galleries of Mg–Al layered double hydroxides (LDHs) by a process involving ion exchange of a Mg 2 Al‐NO 3 LDH precursor with a zinc–citrate complex {Na 2 [Zn(C 6 H 4 O 7 )] · 3 H 2 O} followed by reaction between the intercalated [Zn(C 6 H 4 O 7 )] 2– anion…
Methanol is used in the industrial crystallization of l -serine to reduce solubility and thereby to enhance the recovery from aqueous solutions in which l -serine has been synthesized. Earlier research had shown that the crystal form obtained from such solutions can be either the anhydrous or the monohydrate form of l…
The photoluminescence from functionalized single-walled carbon nanotubes was found to be highly sensitive to the presence of nitroaromatic compounds such as nitrobenzene, 4-nitrotoluene, and 2,4-dinitrotoluene. The strong luminescence quenching in solution was at the upper limit of diffusion-control and also showed si…
Evolutionary engineered polyhydroxyalkanoate (PHA) synthases from Pseudomonas sp. 61-3 enhance PHA accumulation and enable the monomer composition of PHAs to be regulated. We characterized a newly screened Ser477Arg (S477R) mutant of PHA synthase by in vivo analyses of P(3-hydroxybutyrate) [P(3HB)] homopolymer and P(3…
We report a simple and direct synthetic method for the preparation of nanoporous carbon nanotubes with larger pores (>10 nm) on the tube wall. The method combines the use of anodic aluminum oxide (AAO) as a template for the tube diameter and block copolymer/carbohydrates self-assembly within thin films confined inside…
When a liquid droplet experiences a temperature inhomogeneity along its bounding surface, a surface energy gradient is engendered, which when, in a continuous sense, exceeding a threshold, results in a convective flow dissipating the energy. If the associated temperature gradients are sustained by the interface betwee…
Mesoporous silica materials (HS-JLU-20) with an extremely high content of mercaptopropyl groups have been successfully synthesized using fluorocarbon-hydrocarbon surfactant mixtures through a simple co-condensation approach of tetraethyl orthosilicate (TEOS) and (3-mercaptopropyl)trimethoxysilane (MPTS), which are cha…
Recent developments in fullerenes, nanotubes, nanodiamond, and carbon fibers are reviewed.Contributions by different authors are grouped into three sections on the synthesis, chemistry and physics, and device applications of these carbon nanomaterials.As well as covering the materials chemistry from the fundamental an…
The formation of shaped silicas directed by a star poly(ethyleneimine) ( sPEI4 − 200, with benzene core, four arms, and 200 repeated units per arm) was reported. The resulting silicas were characterized with scanning electronic microscope, optical/fluorescence microscope, and UV−vis and fluorescence spectrometers. We…
The elastic tensor of monocrystalline ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ was determined near $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ as a function of pressure, using pulse-echo ultrasound in a large-volume moissanite anvil cell. An unusual decrease in bulk modulus with increased pressure was observed. A framework…
A study involving a large number of carbon nanotube transistors reveals that the nanotube diameter and the metal contact material play key roles in determining the on- and off-state currents of these devices. The results are discussed in terms of the Schottky barrier at the metal-semiconductor junction and the variati…
Ion-exchange in surface-initiated polyelectrolyte brushes provides a versatile route to the formation of catalytically active surfaces for electroless deposition of Cu. The advantage of this procedure is the covalent anchoring of the catalyst support layer, eliminating delamination of the metal film, even when deposit…
A triad D-Ir-A, where Ir is an Ir(III) bisterpyridine complex connected through an amidophenyl spacer to D, a triphenylamine electron donor, and to A, a naphthalene bisimide electron acceptor, has been synthesized and electrochemically investigated. The photoinduced processes in the triad, which is more than 4-nm long…
The varying thermodynamic stability of gallium- (Ga-) stabilized plutonium (Pu) alloys with temperature affords a unique setting for the development of self-irradiation damage. Here, fundamental characteristics of helium (He) bubbles in these alloys with respect to temperature, gallium concentration, and He-to-vacancy…
Structural and electronic properties for seven possible stacking configurations in hexagonal $\mathrm{B}{\mathrm{C}}_{5}$ based on hexagonal BN and graphite structures have been studied using the ab initio pseudopotential density functional method within the local density approximation. From the total energies, struct…
A half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t' in the other) is studied using an optimization variational Monte Carlo method, to consider the Mott transition and superconductivity arising in \kappa-BEDT-TTF_2X. Adopting wave functions with doublon-holon binding f…
The ordering and magnetic properties of bcc-based iron-cobalt alloys have been investigated as a function of the atomic composition. The different states of ordering in $\mathrm{Fe}\text{\ensuremath{-}}\mathrm{Co}$ alloys, from the fully ordered to the disordered state, and their effect on the atomic volume, the magne…
Temperature-dependent conformations of linear polymer molecules adsorbed at carbon nanotube (CNT) interfaces are investigated through molecule dynamics simulations. Model polyethylene (PE) molecules are shown to have selective conformations on the CNT surface, controlled by atomic structures of the CNT lattice and geo…
A technique for fabricating micropatterned aluminum surfaces with parallel grooves 30 µm wide and tens of microns in depth is described. Standard photolithographic techniques are used to obtain this precise surface-feature patterning. Positive photoresists, S1813 and AZ4620, are selected to mask the surface, and a mix…