Materials Literature
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In this article, ultrafine gelatin (Gt) fibers were successfully produced with the use of the electrical spinning or electrospinning technique. A fluorinated alcohol of 2,2,2-trifluoroethanol (TFE) was used as the dissolving solvent. The morphology of the electrospun gelatin fibers was found to be dependent on the alt…
Quantum Magnetics has developed a Quadrupole Resonance (QR) system for the detection of anti-tank and anti-vehicle landmines. The QR confirmation sensor (QRCS) is a part of the Army GSTAMIDS Block 1 program and is designed to confirm the presence of landmines initially flagged by a primary sensor system. The ultimate…
In this paper we present an overview of the method of surface differential reflectivity (SDR) for the study of semiconductor surfaces. We will describe the principles of the technique and the experimental apparatus together with some theoretical considerations concerning the connection of SDR with the microscopic prop…
In this paper we present re-analyses of magnetostriction measurements earlier performed in terbium, dysprosium and holmium single crystals. In the framework of the standard theory of single-ion crystal-electric-field and two-ion exchange magnetostrictions, we explain the thermal variation of the anisotropic saturation…
Within the effective interfacial Hamiltonian approach we evaluate the excess line free energy associated with hemicylindrical droplets of volatile liquid sessile on a stripe-like chemical inhomogeneity of a planar substrate. In the case of short-range intermolecular forces the droplet morphology and the corresponding…
The Tool−Narayanaswamy−Moynihan model (TNM) is widely accepted in order to describe the enthalpy recovery mechanism of polymers. However, some problems have been found in quantitative analysis as far as the parameters of the model are concerned. In particular, in several studies, the values of the Kauzmann temperature…
Choline acetyltransferase (ChAT) synthesizes acetylcholine in cholinergic neurons; regulation of its activity or response to physiological stimuli is poorly understood. We show that ChAT is differentially phosphorylated by protein kinase C (PKC) isoforms on four serines (Ser-440, Ser-346, Ser-347, and Ser-476) and one…
The IR spectroscopic investigation of both the adsorption of carbon monoxide and the interaction of oxygen and CO on the surface of copper colloids is described for the first time. The copper colloids were produced by pyrolysis of [Cu(OCH(Me)CH(2)NMe(2))(2)] in hot n-hexadecylamine. Upon contact to synthetic air Cu/Cu…
This work describes the first atomic-scale computer simulation of explosive crystallization, a process by which an amorphous material, such as Si or Ge, can crystallize at speeds around $15\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s}$ facilitated by a liquid layer that intervenes between the crystal and amorphous…
The temperature dependences of the spectral features in the vicinity of direct band-edge excitonic transitions for rhenium-doped (Re-doped) and undoped WS 2 single crystals are measured over a temperature range of 15–300 K using piezoreflectance (PzR). From a detailed line shape fit of the PzR spectra, the temperature…
Various kinetic models for thermally initiated polymerization of styrene are compared concerning their description of isothermal batch and continuous polymerization as well as their prediction for runaway reactions. All models show good agreement for conversion in both isothermal and adiabatic situations, whereas pred…
The interaction of pyrrole with alkali metal ion exchanged ZSM-5 (Li +, Na +, K +, Rb +, and Cs + ) was studied by the combination of FTIR spectroscopy and the computational hybrid quantum mechanics/interatomic potential function method describing the role of the aluminum framework content and aluminum distribution, p…
Spherical particles of Lu 2 O 3 : x% Eu, with x varying from 0% to 10% with respect to Lu, were prepared by precipitating hydroxides with urea at 80 °C and subsequently decomposing these hydroxides to oxides at 650 °C. TEM pictures revealed that the spherical particles were very uniform in size and their diameters wer…
Stunning tricolored crystals with distinct regions of green, yellow, and orange luminescence (see picture) are deposited in solutions of potassium hydrogen phthalate that contain proflavin. The dye serves as a fluorescent probe of surface charge while identifying the polar crystallographic axis. Optical probes, common…
Electron paramagnetic resonance (EPR) has been used to characterize three distinct V 4+ centres in undoped Czochralski-grown yttrium orthovanadate (YVO 4 ) crystals. These EPR signals are observed at low temperatures, and their average c -axis splittings between adjacent 51 V hyperfine lines are 40 G, 123 G, and 140 G…
We perform molecular dynamics simulations to study lithium dynamics in a model of ${\mathrm{LiPO}}_{3}$ glass at temperatures below the glass transition. A straightforward analysis of the ionic trajectories shows that lithium diffusion results from jumps between sites, the positions and properties of which are basical…
Guest-induced crystallization of amorphous unoriented syndiotactic polystyrene (s-PS) films can generate oriented clathrate phases with the chain axis of s (2/1)2 helicies nearly perpendicular to the film plane. This perpendicular crystalline phase orientation can be maintained after lower temperature annealing proced…
The bonding environment of boron is usually thought about in terms of localized 2c-2e/3c-2e bonding (as in diborane) or completely delocalized polyhedral bonding (as in B(12)H(12)(2)(-)). Recently, a number of boron compounds having a rhomboidal B(4) framework have been synthesized; these show an amazing variation in…
Explanations for stereoselectivity in the Baeyer-Villiger reaction have relied on the assumption that the antiperiplanar (app) group migrates. However, the magnitude of the preference for app-migration over gauche migration is unknown. To investigate this, the energy differences between the two were estimated from ab…
Poly(p-phenylenevinylene)s with amines and pentafluorophenyl esters on side chains were synthesized and assembled on solid substrates by sequential layer-by-layer (LBL) deposition. This approach enables the creation of robust multilayer thin films via in-situ covalent coupling reactions between successive layers. The…