Materials Literature
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Collagen is most abundant in animal tissues as very long fibrils with a characteristic axial periodic structure. The fibrils provide the major biomechanical scaffold for cell attachment and anchorage of macromolecules, allowing the shape and form of tissues to be defined and maintained. How the fibrils are formed from…
We report the transient photovoltaic characters of a Schottky-type porous silicon diode excited by 10 ns laser pulses at 532 nm. At room temperature, the transient photovoltage profile consisted of two different decay components. The fast one had a characteristic decay time of 44 ns and the dominant slow process one o…
CASSCF/MRCI calculations have been performed for five states of ScCl , , , and for which values of the spectroscopic constants , , and are reported.
New silver complexes of alkenes of empirical formula (β-diketonato)Ag(VTES), where β-diketonato = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (hfac) ( 1 ), 1,1,1-trifluoro-2,4-pentanedionato (tfac) ( 2 ), and 2,2-dimethyl-6,6,7,7,8,8,8-heptafluoro-3,5-octanedionato (fod) ( 3 ) and VTES = vinyltriethylsilane, were prepar…
The ceramic form of is of commercial importance as a ceramic capacitor dielectric and it is of scientific interest since it provides a straightforward example of the effect of solid solution composition of ceramics on dielectric properties. This paper presents the results of a sufficient number of measurements of the…
The structures of two fast-ion-conducting molecular glasses, and , have been investigated by neutron and x-ray diffraction. Both molybdate and tungstate glasses show a first sharp diffraction peak (FSDP) at very low Q-values ( and respectively) in the neutron data. However, only weak peaks are observed at similar Q-va…
We report the magnetic field dependence of microwave absorption at low fields (200 Oe), in thin film and bulk samples of La1−xBaxMnO3−z. We demonstrate, using a very simple cavity configuration, that the magnetic field sensitivity of the microwave response of the giant magnetoresistance materials offers possibilities…
The structural, magnetic, and transport behavior of orthorhombic, insulating ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}{\mathrm{MnO}}_{3+\ensuremath{\delta}}$ were studied as a function of temperature from 20 to 300 K. Upon cooling from room temperature, we observe the rapid development of a large breathing-mode dist…
The very first low-frequency infrared absorption and Raman scattering spectra of TTF-CA are presented. Several studies have been performed as a function of temperature at atmospheric pressure. In the neutral phase by infrared absorption, we have emphasized the critical behaviour of an antisymmetric lattice mode (locat…
We have measured the optical properties of the linear chain compound bis-(tetramethyltetraselenafulvalene)hexafluorophosphate, $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6}$, in the spin-density-wave state which develops below ${T}_{\mathrm{SDW}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}12$ K. In the direction per…
We use low-frequency electrophoresis to crystallize monodisperse charge-stabilized colloidal suspensions. Rather than reverting directly to their equilibrium fluid state when the field is removed, some suspensions retain long-lived metastable crystallites whose evolution we track using high-resolution digital video mi…
An abrupt and large increase in the absolute magnitude of λs in sputtered polycrystalline permalloy (Ni81Fe19) films for thicknesses below 7 nm was observed. Permalloy films maintain near-zero magnetostriction with film thicknesses above 7 nm. Film surface studies and microstructural characterizations suggest that the…
Dynamics of phase separation in a polymerizing system, consisting of carboxyl terminated polybutadiene acrylonitrile/epoxy/methylene dianiline, was investigated by means of time-resolved light scattering. The initial length scale was found to decrease for some early periods of the reaction which has been explained in…
Thin amorphous films of tungsten oxide (WO3) are well known to change their optical absorption behavior upon light exposure, usually referred to as photochromic effect. Since the formation of color centers is closely related to the optical creation of electron-hole pairs the sensitivity of the photochromic effect in W…
Thermal chemical vapor deposition was used to deposit fluorocarbon films with chemical resemblance to bulk polytetrafluoroethylene. X-ray photoelectron spectroscopy revealed that the films deposited from thermal decomposition of hexafluoropropylene oxide had fluorine to carbon ratios of 2.0 and CF2 fractions of 90% al…
We report the observation of steps at regular intervals of magnetic field in the hysteresis loop of a macroscopic sample of oriented M${\mathrm{n}}_{12}$${\mathrm{O}}_{12}$(C${\mathrm{H}}_{3}$COO${)}_{16}$(${\mathrm{H}}_{2}$O${)}_{4}$ crystals. The magnetic relaxation rate increases substantially when the field is tun…
We compute the yields of Si and O in the sputtering of SiO2 by He+ ions, and of C from graphite. The sputtering threshold energy, particularly for the ejection of Si, is significantly higher than indicated by previous studies. The computed yields are incorporated in a C-shock code to study SiO formation in gas where t…
The paper presents new results relating to real-time speed measurements obtained from the spectral estimation of rotor slot harmonic frequencies present in the stator currents of a cage induction motor. Derivations of the measurement accuracy and a method for attaining the maximum accuracy are presented. The paper der…
New aromatic bismaleimides containing bis(phenoxy) naphthalene unit, were synthesized. They were prepared by reacting a diamine-containing naphthalene and maleic anhydride by the usual two-step procedure that included ring-opening addition to give bismaleamic acid, followed by cyclodehydration to bismaleimide. The mon…
Local pattern charging during plasma etching of a dielectric material is investigated by means of two-dimensional Monte-Carlo simulation. Detailed surface charge and potential distributions are presented and analysed. The differential pattern charging is shown to induce an electric field which is strong enough to caus…