Materials Literature
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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 > x1 (x1 ≈ 0.5) and a superconducting transition for x < 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…
Within the framework of the periodic bond chain analysis for the prediction of crystal morphology, connected nets play a crucial role. For a face (hkl) often more than one connected net is found. Symmetry relations between such connected nets can give rise to symmetry roughening of nets. In this paper, all cases where…
Scaled versions of a variety of silicon light-emitting diode elements (Si LEDs) have been realized using a standard 1.2-µm, doublepolysilicon, double-metal, n-well CMOS fabrication process. The devices operated with a n+p junction biased in the avalanche breakdown mode and were realized by using standard features of t…
Valence and core-level photoemission spectra show that cleaved $i$-Al-Pd-Mn quasicrystals have a pronounced metallic signature. Spectra from states above ${E}_{F},$ populated by increasing the sample temperature, indicate the presence of a shallow pseudogap 0.09 eV above ${E}_{F}.$ The Al $2p$ line asymmetry, on the o…
X-ray photoelectron emission microscopy (X-PEEM) was used to study the surface orientation of stylized and rubbed polyimide thin films. Using soft X-rays produced by a synchrotron light source, this technique combines high spatial resolution imaging with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy…
Dendrimers and arborols with a carbosilane core have been prepared by a divergent hydrosilylation/vinylation reaction sequence followed by methoxylation of the silicon chloride end groups. Dendrimers with respectively 12 [first generation (1G)] and 36 [second generation (2G)] methoxysilane groups and arborols with oct…
A Raman study of a highly oriented PbTiO3 thin film deposited on a MgO single crystal has been performed as a function of the temperature. The results have been compared with those obtained from a single crystal prepared from the same batch and those reported in the literature for polycrystalline thin films and single…
In this work we present a structural study of the smectic C(SC) and columnar (Colh) liquid-crystalline phases exhibited by a biforked molecule. This study was performed by means of dilatometry and X-ray diffraction measurements performed at different temperatures. Following these measurements, molecular packing within…
We study the first order solid-fluid phase transition of a system of semi-flexible Lennard-Jones chains using molecular dynamics simulations. Thermodynamic integration methods are used to calculate the free energy of the solid and fluid phases. The solid phase free energy per chain can be calculated to an accuracy of…
A 20 MHz single-element ultrasonic probe using 0.91Pb(Zn(1/3 )Nb(2/3))O(3)-0.09PbTiO(3) (PZN-PT 91/9) single crystal has been fabricated. The single crystal of PZN-PT 91/9 orientated to the (001) plane has longitudinal coupling factor of k(33)>90%, which is much larger than the k(33)=70 to 80% of conventional Pb(Zr(1-…
The `frozen-lattice' model is a semi-classical approach for calculating electron diffuse scattering in crystals that has arisen from thermal vibration of crystal atoms. This quasi-elastic scattering approach is, however, unproven since its equivalence with the incoherent phonon-excitation model is not yet established.…
More than 130 years ago it was first recognized that the observed response from many diverse substances may exhibit two distinct types of nonexponential relaxation. Although the Kohlrausch-Williams-Watts (KWW) stretched exponential and Curie-von Schweidler (CvS) power law have since been used to characterize the obser…