Materials Literature
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It has been shown that a polymer network, formed in the SmA phase by UV photocure of photocurable liquid crystalline monoacrylates that are doped in a surface-stabilized ferroelectric liquid crystal (SSFLC), eliminates zig-zag defects in the SmC* phase, Since a chevron layer structure is transformed into a quasi-books…
Our investigation uses the film-interference transmittance spectrum in the computer calculation of thin-film thickness t and complex refractive index n*=n-ik. Titanium oxide films of different thicknesses are studied, and a new approach to determine the film thickness and optical constants is proposed. This new approa…
Based on computer simulations in direct as well as in reciprocal space, a geometrical model for the transformation from decagonal Al–Co–Ni to an orientationally twinned crystalline nanodomain structure is derived. Mapping the atomic positions of the quasicrystal onto the corresponding positions of its (4, 6)-approxima…
Highly efficient acentric crystalline materials are sought for applications involving various nonlinear optical (NLO) phenomena. A new series of mainly acentric, crystalline materials based on the non-rod-shaped π-conjugated hydrazone skeleton are presented, along with their molecular and NLO properties and the single…
Losses in power transformer cores can be predicted from knowledge of localised flux distribution within the assembled laminations. This together with a knowledge of the stress sensitivity of the losses of grain-oriented, 3% silicon iron can ideally be used to estimate the total core loss. The localised flux density is…
We apply the classical Preisach model to reproduce the major and minor thermal hysteresis loops in the high-spin /spl rlarr2/ low-spin transition for [Fe(bt)/sub 2/(NCS)/sub 2/]H/sub 2/O and Fe(bt)/sub 2/(NCS)/sub 2/ (bt=2,2'-bi-thiazoline). For this purpose, we consider that spin transition occurs through spin domain…
Electronic absorption and emission spectra are reported for luminescent d(0) monoimido group 5 compounds M(NR)Cl(3)L(2) (M = Nb, Ta; R = alkyl, aryl; L = dme, Cl(-), py). These compounds display weak (epsilon < 200 M(-)(1) cm(-)(1)), well-resolved lowest-energy transitions in the high-energy visible and near-UV region…
The utilization of CF3I in the plasma assisted dry etching of SiO2 has been studied in order to reduce the environmental impact of microelectronics device fabrication. The results show that CF3I is a promising substitute of CF4 in oxide etching since its utilization reduces 3–3.5 times the contribution to the global w…
Two types of new polyurethanes with a highly NLO active chromophore, 2-[4-[4-[bis(2-hydroxyethyl)amino]phenylazo]benzylidene]malonitrile (HAPM), in the polymer side chain were synthesized (PU1-DCN and PU2-DCN) and characterized. The diisocyanate components of the polymers are 2,4-tolylene diisocyanate and 3,3′-dimetho…
Abstract Hydroxyaluminosilicate (HAS) ions were prepared from solutions containing hydroxyaluminum (HyA) ions and orthosilicic acids at an Al concentration of ≈4 m M ; Si/Al molar ratios of 0, 0.25, 0.5, and 1.0; and NaOH/Al molar ratios of 1.0, 2.0, and 2.5. Phosphate retention behavior of montmorillonite (Mt) carryi…
Ga focused-ion-beam (FIB)-assisted etching of single-crystal diamond and thin film diamond in XeF2 was studied. The etch yield in FIB-assisted etching of diamond in XeF2 is enhanced some six times over the physical sputtering yield. In the crystal orientation dependence of the etch yield in FIB-assisted etching, the (…
It is well known that the problem of classifying the symmetry of simple lattices leads to consideration of the conjugacy properties of the holohedral crystallographic point groups (`holohedries'). Classical results for the three-dimensional case then state that: (i) the orthogonal classification of the holohedries sub…
Abstract A novel class of one-dimensional supramolecular assembly dispersed in organic media was prepared from halogen-bridged mixed valence platinum complex and anionic amphiphiles. Their intervalence absorption characteristics and nanostructures varied depending on the chemical structure of amphiphiles.
Abstract MCM-41 materials were prepared hydrothermally by using template mixtures of hexadecyltrimethylammonium/dodecyltrimethylammonium (C16TMABr/C12TMABr) with various molar ratios. The MCM-41 materials thus prepared were highly ordered and their pore sizes can be finely controlled by changing the C16TMABr/C12TMABr…
Abstract The electrical properties of a series of λ-type BETS conductors, λ-BETS2(FexGa1−x)Cl4 can be controlled continuously by varying the x-value. The system shows a metal-insulator transition for x &gt; x1 (x1 ≈ 0.5) and a superconducting transition for x &lt; x1. The T-x phase diagram indicates that the s…
The reaction of Ce or Gd with a molten mixture of A(2)Se/P(2)Se(5)/Se (A = Rb, Cs) produced the quaternary compounds Rb(3)CeP(2)Se(8) (I) and Cs(3)GdP(2)Se(8) (II), as well as Rb(2)CeP(2)Se(7) (III) and Rb(2)GdP(2)Se(7) (IV). The orange crystals of I, II and the red crystals of III, IV are air- and water-sensitive. Co…
μ-Carbidophthalocyaninato(2–)eisen(IV)tetraphenylporphyrinato(2–)eisen(IV) (2) wird neben μ-Carbido-bis(tetraphenylporphyrinato(2–)eisen(IV)) (1) durch die Reaktion von Phthalocyaninato(2–)ferrat(I) mit Dichlorcarbentetraphenylporphyrinato(2–)eisen(II) dargestellt. 1 und 2 lösen sich wie μ-Carbido-bis(phthalocyaninato…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTGeneration of Chirality in Guest Aromatic Ketones Included in the Crystals of Steroidal Bile AcidsMaria Gdaniec and Tadeusz PołońskiView Author Information Faculty of Chemistry, A. Mickiewicz University 60-780 Poznań, Poland Department of Chemistry, Technical Universit…
A vane rheometer was used to measure the modulus of foam systems. Modulus development in a reactive polyurethane foam system was captured using a commercial stress-controlled rheometer with a four-blade vane geometry test fixture. The results were compared to those from a temperature programmed flooded parallel plate…
We explore the interdiffusion of oppositely labeled triblock polystyrene chains, HDH/DHD, during welding in the melt using dynamic secondary ion mass spectroscopy (DSIMS) and specular neutron reflectivity (SNR). The HDH chains have the central portion of the chain deuterated (D) approximately 50% while the two ends (H…