Materials Literature
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We have developed so-called polymer Langmuir–Blodgett (LB) films (polymer nanosheets) based on acrylamide polymer and its copolymers, and have reported a series of various functional polymer nanosheet assemblies. To fabricate photofunctional nanodevices, we have succeeded in the introduction of various photoactive chr…
We report the fabrication of BiFeO 3 /BiCrO 3 (111) artificial superlattices with 1/1 stacking in a layer-by-layer growth mode on atomically flat SrTiO 3 (111) surfaces. While BiFeO 3 and BiCrO 3 are antiferromagnets having Fe–O–Fe and Cr–O–Cr bonds, these superlattices contain Fe–O–Cr bonds, in which ferromagnetic in…
In this study we evaluated several precursors such as tetrakis(dimethylamino) titanium (TDMAT), tetrakis (diethylamino) titanium (TDEAT), tetrakis(ethylmethylamino) titanium (TEMAT) along with novel PrimeTiTM, StarTiTM and TyALDTM for TiO2 ALD application with both water and ozone as the oxidizer. Each precursor is ev…
The low-frequency modes of protein hydration water are investigated by inelastic neutron scattering. Experiments on both protonated and fully deuterated maltose binding protein samples allow us to unambiguously single out the contribution from water. The low-energy vibrational density of states of hydration water at 1…
We present a combined study of the thermal expansion and the thermal conductivity of the perovskite series $R{\text{CoO}}_{3}$ with $R=\text{La}$, Nd, Pr, and Eu. The well-known spin-state transition in ${\text{LaCoO}}_{3}$ is strongly affected by the exchange of the $R$ ions due to their different ionic radii, i.e.,…
Phase-pure BiCuOSe, which is isostructural to the layered p-type transparent conductor LaCuOS, has been synthesized in high yield by a single-step hydrothermal reaction at low temperature (250 degrees C) and pressure (<20 atm). A moderate reaction temperature of 250 degrees C was sufficiently high to solubilize both B…
The local saturation in porous transport layers (PTL) has been determined using synchrotron-based x-ray micro-tomography. The water distribution inside the porous structure could be resolved on the scale of the pores. After phase segmentation of the image data, the measurement of the liquid saturation as function of t…
The coordination chemistry of the dianionic fluorous dialkoxy−diimino ligand {OC(CF 3 ) 2 CH 2 C(Me)═NCH 2 CH 2 N═C(Me)CH 2 C(CF 3 ) 2 O} 2− ({ON Et NO} 2− ) onto Y(III) and La(III) centers has been studied. The diimino−diol {ON Et NO}H 2 reacts with 1 equiv of Y(N(SiHMe 2 ) 2 ) 3 ·2THF to afford {ON Et NO}Y(N(SiHMe 2…
We systematically study the relationship between equilibrium and nonequilibrium phase diagrams of a system of short-ranged attractive colloids. Using Monte Carlo and Brownian dynamics simulations we find a window of enhanced crystallization that is limited at high interaction strength by a slowing down of the dynamics…
We develop an extended version of the mode-coupling theory (MCT) for glass transition, which incorporates activated hopping processes via the dynamical theory originally formulated to describe diffusion-jump processes in crystals. The dynamical-theory approach adapted here to glass-forming liquids treats hopping as ar…
Chiral mesoporous materials have been prepared with purely organic monomers employing an enantiomerically pure biphenyl bis-siloxane as a dopant along with simple 4,4'-bis(triethoxysilyl)biphenyl as the bulk material. Analysis of these materials by CD spectroscopy indicates the formation of new chiral aggregates in th…
We studied exciton structures and the Aharonov-Bohm effect in a single carbon nanotube using micro-photoluminescence (PL) spectroscopy under a magnetic field at low temperatures. A single sharp PL peak from the bright exciton state of a single carbon nanotube was observed under zero magnetic field, and the additional…
The formations of glycerol (Gly)-plasticized whey protein isolate (WPI)-hydroxypropylmethylcellulose (HPMC) films, blended using different combinations and at different conditions, were investigated. The resulting WPI: Gly-HPMC films were analyzed for mechanical properties, oxygen permeability (OP), and water solubili…
Chain-like agglomeration (one-dimensional self-assembly) of aqueous gold nanoparticles (NPs) has been experimentally and theoretically studied. It is demonstrated that the chain growth of aqueous gold NPs is mainly triggered by the anisotropic dipolar interaction due to the Au−S bonding originating from the thiol-liga…
The stability of a dislocation defect with two pentagon-heptagon (5-7) pairs in a graphene layer is investigated within first-principles density-functional theory scheme. It is found that the structure of the dislocation defect with two 5-7 pairs becomes more stable than a local haeckelite structure which is composed…
Aperiodic tilings are interesting to mathematicians and scientists for both theoretical and practical reasons. The serious study of aperiodic tilings began as a solution to a problem in logic. Simpler aperiodic tilings eventually revealed hidden "symmetries" that were previously considered impossible, while the tiling…
Layer-by-layer (LbL) assembly is a versatile way to construct thin film nanocomposites and to modify surfaces. This technology is broadly useful because it is a simple and forgiving synthetic method. Most commonly, this approach to fabrication of an interface involves multilayer ionic assembly of polyelectrolytes. Whi…
The unique symmetry properties of second harmonic generation (SHG) microscopy enabled sensitive and selective imaging of protein microcrystals with negligible contributions from solvated proteins or amorphous protein aggregates. In studies of microcrystallites of green fluorescent protein (GFP) prepared in 500 pL drop…
We report magnetic susceptibility, specific heat, and Raman scattering investigations of alpha-TeVO4 containing V-O edge-sharing chains. These chains promote a system of ferromagnetic/antiferromagnetic spin-1/2 Heisenberg alternating exchange chains with pronounced spin frustration. The magnetic susceptibility and Ram…
We present it ab initio calculations of the electronic energy loss of charged particles moving outside a magnesium surface, from a realistic description of the one-electron band structure and a full treatment of the dynamical electronic response of valence electrons. Our results indicate that the finite width of the p…