Materials Literature
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o-terphenyl is one of the organic liquids in which a fast mode of crystal growth is activated near the glass transition temperature T(g) and continues deep in the glassy state. This growth mode, termed glass-crystal (GC), is not limited by molecular diffusion in the bulk liquid, in contrast to the diffusion-controlled…
We demonstrate high-efficiency ultraviolet (UV) laser generation in a nonlinear optical crystal BaAlBO3F2 (BABF); 355 nm UV light was generated by using a type I BABF crystal as a sum-frequency mixing of the fundamental light and the second harmonic from a picosecond Nd:YAG laser operated at a repetition rate of 10 Hz…
Using an in situ Diels−Alder (DA) “click chemistry” strategy for reactions between anthracene and maleimide functional groups, two prototypes of novel nonlinear optical (NLO) side-chain polymers ( PMI-A7 and PMI-B7 ) containing highly hyperpolarizable but chemically sensitive phenyltetraene-based chromophores were syn…
Here we report synthesis of CdSe quantum dots (QDs) by evaporation of bulk CdSe using the solvated metal atom dispersion method (SMAD), followed by reflux in toluene and in t -butyltoluene (TBT). The as-prepared SMAD product exhibits broad photoluminescence spectra (PL), but upon reflux in toluene or t -butyltoluene,…
The exchange-coupling constants in dinuclear 1,1-azidonickel(II) complexes and in one tetranuclear complex have been analyzed by using electronic structure calculations based on density functional theory. The calculated J values show a correlation with the Ni-N-Ni angle; however, the available experimental data do not…
Relaxation enthalpies in the vicinity of glass transitions were recorded on the basis of the heat capacity curves measured in nine glass-forming molecular liquids and solutions in the well defined cooling and subsequent heating cycles. It is observed that enthalpy hysteresis in the cooling/heating cycles is less signi…
The dielectric and magnetic properties and their correlations were investigated in polycrystalline perovskite ${\text{LaCoO}}_{3\ensuremath{-}\ensuremath{\delta}}$. The intrinsic bulk and grain-boundary (GB) dielectric relaxation processes were deconvoluted using impedance spectroscopy between 20 and 120 K, and resist…
Abstract Debye temperatures and Grueneisen parameters of chain TlSe and TlInSe 2 were calculated using our earlier obtained ab‐initio results on phonon band structure and existed experimental data on thermal expansion coefficient. For both compounds, the values of heat capacity at constant volume (C v ) were found to…
Abstract In this article, epoxidized carbon nanotubes (CNTs) are used to modify current epoxy resins. The produced epoxy groups on the nanotube surface significantly enriched nanotube chemistry and made them soluble in the organic solvents. Atomic force microscopy characterization indicated that epoxidized nanotubes w…
Abstract High‐density polyethylene (HDPE)/poly(ethylene terephthalate) (PET) blends were prepared by means of melt extrusion with ethylene–butyl acrylate–glycidyl methacrylate terpolymer (EBAGMA) as a reactive compatibilizer. The effects of the EBAGMA and PET contents, recovery temperature, and stretch ratio on the th…
A new tuning strategy for mirror-less liquid crystals laser is presented. A three layer cell is prepared with two cholesteric layers sandwiching a layer containing an isotropic mixture of a photoluminescent dye. One of the chiral layers contains a wide band gap material while the second layer consists of a series of s…
We study colloidal gels formed upon centrifugation of dilute suspensions of spherical colloids (radius 446 nm) that interact through a long-range electrostatic repulsion (Debye length approximately 850 nm) and a short-range depletion attraction (approximately 12.5 nm), by means of confocal scanning laser microscopy (C…
Branched polyesters composed of poly(L-lactide)s (PLLAs) and 3,4-dihydroxycinnamic acid (DHCA) were obtained by the thermal melt-polycondensation of 3,4-diacetoxycinnamic acid (DACA)-terminally conjugated PLLAs (DACA-PLLAs). The chemical structures of the DHCA/PLLA polyesters were confirmed by FT-IR and (1)H NMR measu…
Differential scanning calorimetry (DSC) has been applied to study the enthalpy relaxation in maltitol glass at 39-42 degrees C. Isoconversional kinetic analysis of the data has revealed that the effective activation energy of the process increases significantly upon the conversion from the glassy to supercooled liquid…
Short-chain-length/medium-chain-length (SCL/MCL) polyhydroxyalkanoate (PHA) was produced in the plastids of Arabidopsis thaliana. Phe87Thr (F87T) mutated 3-ketoacyl-acyl carrier protein (ACP) synthase III (FabH) from Escherichia coli , and Ser325Thr/Gln481Lys (ST/QK) mutated polyhydroxyalkanoate (PHA) synthase (PhaC1)…
Abstract Mut zur Lücke : Mg/ZnO‐Nanopartikel mit heller, stabiler Photolumineszenz in kolloidalen Dispersionen wie im Festkörper bilden sich durch Dotierung von Mg 2+ ‐Ionen in ZnO‐Nanopartikel durch sonochemische Synthese. Ihre Bandlücken und Lumineszenzeigenschaften verändern sich mit der Defektkonzentration in den…
Abstract Phosphor‐based polymer composites were prepared using a melt mixing and extrusion method. Morphology, luminescent properties, and Hamburg wheel test (HWT) of synthesized hybrid material were studied using various polymer matrices. The intensities of the luminescence of the strontium aluminates phosphors (SrAl…
Polyhydroxyalkanoates (PHAs) as an attractive biopolymer with a wide range of applications have been extensively studied. Many new strategies have been employed to effectively and economically produce PHAs. This mini-review mainly focuses on the research and development of new PHAs-producing strains, utilization of re…
We propose a modified Josephson corner-junction experiment which can test whether the order parameter in the iron pnictides changes sign between the electron and hole pockets of the Fermi surface.
We examine the effects of void morphology and critical current density (jc) on the electromigration failure distributions of Cu/low-kdual-damascene vias. Cu dual-damascene vias exhibit multiple modes of electromigration-induced voiding, and reliability is strongly dependent on the morphology of voids. We have develope…