Materials Literature
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Based on a concise review of the experimental data, a theory of the structural, kinetic, and dynamic features of the Fischer cluster is put forward. This theory is based on the idea of heterophase fluctuations of glass-forming liquids. According to these ideas in a one-component liquid the solidlike and fluidlike tran…
A chiral liquid crystalline (LC) substituent with a fluorine-containing asymmetric moiety was introduced into the 3-position of a thiophene ring. Polymerizations of 2,5-dibrominated thiophene derivatives were carried out through dehalogenative polycondensations. Polythiophene derivatives thus prepared were fusible and…
Abstract A series of polymer–clay nanocomposite (PCN) materials consisting of polystyrene (PS) and layered montmorillonite (MMT) clay was prepared by effectively dispersing the inorganic nanolayers of MMT clay in the organic PS matrix via in situ thermal polymerization. Organic styrene monomers were first intercalated…
The A-site-ordered/disordered manganese perovskites, RBaMn 2 O 6 / R 0.5 Ba 0.5 MnO 3 (R = Y and rare earth elements), are reviewed. RBaMn 2 O 6 displays remarkable features: (1) the charge/orbital order (CO) transition at relatively high temperatures far above 300 K, (2) a new stacking variation of the CE-type CO wit…
Atomistic simulation calculations have been used to study disorder and deviation from stoichiometry in synthetic garnets A 3 B 5 O 12 as a function of A 3+ (Y 3+, Lu 3+ to La 3+ ) and B 3+ (Al 3+, Ga 3+, Fe 3+ ) ionic radius. Trends corresponding to the energy of several defect reactions have been obtained. Results co…
We measure the dispersion relation of capillary waves on a liquid surface by heterodyne x-ray photon correlation spectroscopy near the transition from propagating to overdamped dynamic behavior. A strong deviation of the propagation frequency from the small-damping result omega(p) proportional, variant k(3/2) is obser…
Interfacial glass transition temperature (T(g)) profiles in spin cast, ultrathin films of polystyrene and derivatives were investigated using shear-modulated scanning force microscopy. The transitions were measured as a function of film thickness (delta), molecular weight, and crosslinking density. The T(g)(delta) pro…
We have studied the chemical and material aspects of molecular precursor-derived materials taking the example of the spinel MgAl 2 O 4 . Three Mg−Al alkoxides, [MgAl 2 (OPr i ) 8 ], [MgAl 2 (OBu t ) 8 ] and [MgAl 2 (OBu t ) 4 H 4 ] were used as single molecular precursors in the gas-phase synthesis of the MgAl 2 O 4 f…
We present theoretical and experimental evidence for CO(2) adsorption on different sites of single walled carbon nanotube (SWNT) bundles. We use local density approximation density functional theory (LDA-DFT) calculations to compute the adsorption energies and vibrational frequencies for CO(2) adsorbed on SWNT bundles…
The crystallographic and magnetic phase diagram of the two-electron-doped system $({\mathrm{Ca}}_{1\ensuremath{-}x}^{2+}{\mathrm{Ce}}_{x}^{4+}){\mathrm{MnO}}_{3}$ with $0<~x<~0.167$ has been determined using neutron powder diffraction, synchrotron x-ray powder diffraction, small angle scattering, and ac suscepti…
A coupled-line coupler comprising a microstrip line, edge-coupled to a negative-refractive-index line, exhibits co-directional phase but contra-directional Poynting vectors on the lines, leading to backward coupling. A key feature of this coupler is that it can support complex coupled modes. The resulting exponential…
Investigation of glass transition dynamics in polyolefins by broadband dielectric spectroscopy (DRS) is facilitated by the addition of a novel dielectric probe, (4,4‘-( N,N -dibutylamino)-( E )-nitrostilbene (DBANS), which introduces dipoles and made the polymers dielectrically active. For probe concentrations between…
The high-resolution two-dimensional protein gel electrophoresis technique combined with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) was used to analyse the oxidative stress response in Staphylococcus aureus COL. Exponentially growing cells were supplemented with 100 mM H…
We report on the photoinduced superhydrophilicity of the surface of amorphous TiO2. Amorphous TiO2 thin films were prepared on self-assembled monolayers by the peroxotitanate-complex deposition (PCD) and liquid-phase deposition (LPD) methods. The surface morphology and topography were characterized in detail. The cont…
Nanostructured La0.67Ca0.33MnO3 (NS-LCMO) was formed by pulsed-laser deposition on the surface of porous Al2O3. The resistance peak temperature (Tp) of the NS-LCMO increases with increasing average thickness of the films, while their Curie temperatures (Tc) remain unchanged. The coercive field of the samples increases…
We visualize entanglements in polymer melts using molecular dynamics simulation. A bead at an entanglement interacts persistently for long times with the non-bonded beads (those excluding the adjacent ones in the same chain). The interaction energy of each bead with the non-bonded beads is averaged over a time interva…
Possible candidates for the Mg2B3Ox nanostructures observed in bulk of polycrystalline MgB2 (Ref.1) have been studied using a combination of Z-contrast imaging, electron energy loss spectroscopy (EELS) and first-principles calculations. The electronic structures, phonon modes, and electron phonon coupling parameters a…
We present results of wavelength-dependent ultrafast pump-probe experiments on micelle-suspended single-walled carbon nanotubes. The linear absorption and photoluminescence spectra of the samples show a number of chirality-dependent peaks, and consequently, the pump-probe results sensitively depend on the wavelength.…
Through time-resolved two-color magneto-optical Kerr spectroscopy we have demonstrated that photogenerated transient carriers decrease the coercivity of ferromagnetic InMnAs at low temperatures. This transient ``softening'' persists only during the carrier lifetime ($\sim$ 2 ps) and returns to its original value as so…
Wide-angle X-ray diffraction (WAXD) was used to investigate the effects of shear on the crystallization behavior of polypropylene (PP) with β -nucleating agent. The melt was subjected to shear at the shear rate from 0.5 to 60 s -1 for 5 s with a CSS450 shear stage. For the PP with low content of the additive, the form…