Materials Literature
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Nature calls: The lotus leaf is held as a symbol of purity due to its ability to remain clean after emerging from murky ponds. Its superhydrophobic surface, which removes undesired particles in water droplets, is mimicked by a simple and inexpensive method involving self-generation of superhydrophobic films on copper…
The partial-dislocation-mediated processes have so far eluded high-resolution transmission electron microscopy studies in nanocrystalline (nc) Ni with nonequilibrium grain boundaries. It is revealed that the nc Ni deformed largely by twinning instead of extended partials. The underlying mechanisms including dissociate…
Abstract Summary: Semicrystalline specimens of poly( L ‐lactic acid) (PLLA) were prepared by isothermal cold‐ or melt‐crystallization over a wide temperature range. The morphologies at different length scales were characterized using polarized optical microscopy, WAXS and SAXS. The glass transition temperature ( T g )…
Epitaxial thin films of ordered double-perovskite La2NiMnO6 were deposited on SrTiO3, (LaAlO3)0.3–(Sr2AlTaO6)0.7, and LaAlO3 substrates by a pulsed-laser deposition method. A rock-salt-type ordering for Ni2+ and Mn4+ ions was confirmed through structural and magnetic measurements. Despite the difference in heteroepita…
We present a Li and Ti codoped NiO-based polycrystalline ceramic with high-permittivity dielectric properties. Analysis of the ceramic microstructure and composition proves that obvious grain boundaries are formed. The measurements of frequency and temperature dependence of impedance and dielectric permittivity indica…
The interaction and exchange-correlation contributions to the ground-state energy of an arbitrary many-electron system can be obtained from a spherical average of the wavevector-dependent diagonal structure factor (SF). We model the continuous-k spherically averaged SF using quantum Monte Carlo calculations in finite…
ABSTRACT: Hydrophobic beeswax emulsions were incorporated into hydrophilic starch films to modify physical, mechanical, and thermal properties of the films. Beeswax was added in the film‐forming solution of high‐amylose pea starch (35% to 40% amylose w/w) at the level of 0%, 10%, 20%, 30%, and 40% w/w of starch with g…
We measure electrical transport on networks of single wall nanotube of different origin as a function of temperature T, voltage V and pressure P . We observe Luttinger liquid (LL) behavior, a conductance T^alpha and a dynamic conductance V^alpha . We observe a sample dependent P variation of the alpha parameters, inte…
Abstract Summary: Stimuli‐responsive glycopolymer brushes composed of N ‐acryloyl glucosamine (AGA) and N ‐isopropylacrylamide (NIPAAm) were prepared using RAFT polymerization. The RAFT agent was immobilized on the surface of a treated silicon waver via covalent attachment using the Z‐group. PAGA and PNIPAAm brushes s…
Starting from the fourfold ethynyl-substituted chromophore 1,3,6,8-tetraethynylpyrene as core, a series of polyphenylene dendrimers was prepared in high yield by combining divergent and convergent growth methods. The fluorescence quantum yields (Q(f)>0.92) of the encapsulated pyrene chromophore were independent of the…
We report a strong experimental evidence of the optical anisotropy in a CdTe-based microcavity: the polarization of light is pinned to one of the crystallographic axes independently on the polarization of the excitation. The polarization degree depends strongly on the excitation power, reaching almost 100 % in the sti…
We report on the growth and functional characterizations of epitaxial thin films of the multiferroic YMnO3. We show that using Pt as a seed layer on SrTiO3(111) substrates, epitaxial YMnO3 films (0001) textured are obtained. An atomic force microscope has been used to polarize electric domains revealing the ferroelect…
The effect of additional doping of charge impurities was investigated in a ferromagnetic semiconductor Zn1-xCrxTe. It was found that the doping of iodine, which is expected to act as an n-type dopant in ZnTe, brought about a drastic enhancement of the ferromagnetism in Zn1-xCrxTe, while the grown films remained electr…
Extended x-ray absorption fine structure experiments at the Zr $K$ edge were carried out on perovskite relaxor ferroelectrics $\mathrm{Ba}{\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{Zr}}_{x}{\mathrm{O}}_{3}$ (BTZ) $(x=0.25,0.30,0.35)$, and on $\mathrm{Ba}\mathrm{Zr}{\mathrm{O}}_{3}$ for comparison. Structural information…
We derive a set of rotationally covariant amplitude equations for use in multiscale simulation of the two-dimensional phase-field crystal model by a variety of renormalization-group (RG) methods. We show that the presence of a conservation law introduces an ambiguity in operator ordering in the RG procedure, which we…
We have investigated the magnetic transition and magnetic structure of triple-layered ruthenate Sr4Ru3O10 directly using neutron scattering techniques. Only one ferromagnetic phase is observed, and previously proposed antiferromagnetic phase transitions are ruled out. The complex anisotropic magnetotransport, magnetiz…
Thermal scaling and relaxation of the interface width in an electrophoretic deposition of polymer chains is examined by a three-dimensional Monte Carlo simulation on a discrete lattice. Variation of the equilibrium interface width $W_r$ with the temperature $T$ shows deroughening $W_r \propto T^{-δ}$, with $δ\sim 1/4$…
In this paper the relationship between the density functional theory of freezing and phase field modeling is examined. More specifically a connection is made between the correlation functions that enter density functional theory and the free energy functionals used in phase field crystal modeling and standard models o…
We have investigated the structural, magnetic, thermodynamic, and dielectric properties of polycrystalline ${\mathrm{CoCr}}_{2}{\mathrm{O}}_{4}$, an insulating spinel exhibiting both ferrimagnetic and spiral magnetic structures. Below ${T}_{c}=94\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ the sample develops long-range fer…
Single phase (001)-oriented ${\mathrm{BiFeO}}_{3}$ (BFO) thin films grown by pulsed laser deposition can only be obtained in a narrow window of deposition pressure and temperature and have a low magnetic moment. Out of the stability window Fe- or Bi-rich impurity phases form, which has a strong impact on the physical…