Materials Literature
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Novel photochromic single crystals composed of three different kinds of diarylethenes, 1,2-bis(3,5-dimethyl-2-thienyl)perfluorocyclopentene (1a), 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (2a), and 1,2-bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluorocyclopentene (3a), have been prepared. The three-compone…
A new dual-function hybrid molecular material has been obtained from the organic donor bis(ethylenedithio)tetraselenafulvalene and the honeycomb oxalate-based bimetallic network [MnCr(ox)3]-. This multilayer material consists of layers of the inorganic anionic 2D network, responsible for the appearance of ferromagneti…
We show that in YVO3 new hard phonons gradually become zone center active below ~210 K verifying that a lattice phase transition takes place at about that temperature. The Debye-Waller factor found from EXAFS measurements show an additional disorder below 150K seen as a departure from the thermal behavior. We bring up…
This paper reports on the synthesis and characterization of oversized titania nanosheets derived from single crystals of a potassium lithium titanate, K 0.8 Ti 1.73 Li 0.27 O 4 . The single crystals with a lateral size of over 1 mm were obtained via a melt and recrystallization process in a flux melt. The crystals wer…
From disorder to order and back: Contrary to all earlier studies on [Fe(2-pic)3]Cl2⋅EtOH (pic=picolylamine), an ordered phase (IP) with two crystallographically different iron sites was found between disordered high-spin (HS) and low-spin (LS) phases. The picture shows the average FeN distances of all three phases.
A net change: A fully reversible ligand substitution involving coordination/uncoordination of gaseous water and pyrimidine induces the repetitive allosteric transformation of three interpenetrated nets into a single three-dimensional net. The transformation does not affect the crystallinity of the sample but alters si…
The focus of this review is on host-guest composites with photonic antenna properties. The material generally consists of cylindrical zeolite L crystals the channels of which are filled with dye molecules. The synthesis is based on the fact that molecules can diffuse into individual channels. This means that, under th…
We report on the synthesis of semiconductor nanocrystals of PbS, ZnS, CdS, and MnS through a facile and inexpensive synthetic process. Metal-oleylamine complexes, which were obtained from the reaction of metal chloride and oleylamine, were mixed with sulfur. The reaction mixture was heated under appropriate experiment…
Abstract The effects of short‐chain branch (SCB) length on the calibration of temperature rising elution fractionation (TREF) were examined. Samples of ethylene–hexene, ethylene–octene, and a novel polyolefin produced using Eastman Chemical Company's Gavilan catalyst technology were used to prepare TREF calibration cu…
Effect of the magnetic field on the martensitic transformation of Co-Ni-Al single-crystal was investigated by differential thermal analysis (DTA) and the in-situ microstructure observation under magnetic field. The martensitic transformation temperatures Ms and Mf of the Co<sub>34.5</sub>Ni<sub>35.5</sub>Al<sub>30</su…
Zein is a hydrophobic corn protein, rich in leucine, proline and alanine, that has has previously been investigated as a potential excipient in pharmaceutical manufacturing. We have investigated the diffusion through or from zein-containing systems and proposed aqueous channels formed by hydration and swelling as the…
Shape memory alloys (SMA) are able to provide high work output when they undergo the martensitic transformation. Therefore, they present a favorable actuation mechanism for microsystems, e.g. for microvalves, switches or microgrippers. Sputter deposited thin SMA films are already in use as free-standing films or as co…
We present a theoretical study of the Larmor frequency dependence of the nuclear spin-lattice relaxation caused by order director fluctuations for both nematic and smectic-A mesophases. The analysis is focused on the case where the molecular system is subjected to sonication during the relaxation process. The departur…
Abstract Crosslinked poly(butyl acrylate‐ co ‐2‐ethylhexyl acrylate) [P(BA–EHA)] latex was synthesized by seeded emulsion polymerization. P(BA–EHA)/poly(vinyl chloride) (PVC) composite latex was prepared using P(BA–EHA) latex as the seed. The effects of the amount of P(BA–EHA) on the latex particle diameters and mecha…
Single crystal specimens of Fe-17 at. % Ga were tested in tension at room temperature. Specimens with a tensile axis orientation of [110] displayed slip lines on the specimen faces corresponding to slip on the {110}<111> with a critical resolved shear stress of 220 MPa. Yielding began at 0.3% elongation and 450 MPa. A…
The elasticity of both the austenite and martensite states of a NiMnGa Heusler alloy was investigated by using a continuous wave method. A magnetic field was used to detwin the martensite. The symmetrized elastic constants of both austenite and martensite were determined by exiting different modes of wave propagation.…
Abstract This work examined the miscibility, crystallization kinetics, and melting behavior of melt‐mixed poly(trimethylene terephthalate) (PTT)/poly(ethylene‐ co ‐cyclohexane 1,4‐dimethanol terephthalate) (PETG) blends. Differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction techniques were used to a…
NiMnGa thin films have been deposited by magnetron sputtering on Mo substrates using a Ni<sub>50</sub>Mn<sub>30</sub>Ga<sub>20</sub> powder metallurgical target. Independent from variation of substrate temperature during the sputtering process the deposited films are found to be polycrystalline. X-ray diffraction patt…
This article reports ab initio Fermi surfaces and conduction-band calculations of both stoichiometric and oxygen-reduced ${\mathrm{MoO}}_{3}.$ The data, based on a TB-LMTO approach in LDA, provide a convincing and detailed interpretation of the one-electron removal XPS valence bands, where a clear energy gap is observ…
I report first principle density-functional calculations that demonstrate an insulator-metal transition based on the bending of covalent bonds in 1,3,5-triamino-2,4,6-trinitrobenzene, an organic molecular crystal. The critical shear angle responsible for the vanishing of the energy band gap is achieved at near constan…