Materials Literature
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E-Z photoisomerizable chiral dopants are a class of materials that can be used to prepare birefringent optical components with patterned optical properties. Two new photoisomerizable chiral dopants have been synthesized and analysed. The materials were derived from nopinone and camphor. The properties of these compoun…
Europium doped Al2O3 photoluminescent coatings have been prepared by an ultrasonic spray pyrolysis process, using a solution of 0.05M of AlCl3 · 6H2O as starting material and EuCl3 as doping. These films were deposited on Pyrex glass substrates at atmospheric pressure using purified air as a carrier gas. All films wer…
We show that the transition temperature ${T}_{c}$ of Nb-doped strontium titanate thin films grown in vacuum by pulsed laser deposition is similar to bulk and that these films follow a similar dependence of ${T}_{c}$ on the carrier density as bulk. We have measured the temperature dependence of the upper critical field…
The syntheses of the first examples of aromatic thiazole-containing porphycene analogues 3 have been accomplished by oxidation of the corresponding 3,20:10,13-diepithio-6,9:16,19-diimino-1,11-diaza[20]annulenes 9 with DDQ. Compounds 9a−c have been synthesized by McMurry coupling reaction of the diformylated 2-(1H-pyrr…
Electrostrictive ceramics based on Pb(Mg(1/3)Nb(2/3 ))O(3) have demonstrated promise as low-frequency active materials. They broaden the range of design options by providing a mix of properties unavailable in traditional piezoceramics. Typical properties are: 1000 microstrain on the interval 0-1 MV/m with a k(33) of 0…
A flow reactor for evaluation of low surface area, model catalysts has been designed. The aim is to measure catalytic activity at atmospheric pressure on nanofabricated model catalysts, primarily made by the electron-beam lithography (EBL) technique. This is a challenge because of the low attainable active surface are…
Investigations of the Fermi surface of a new organic metal: (BEDT-TTF)4[ Ni(dto)2] , M. Schiller, W. Schmidt, E. Balthes, D. Schweitzer, H.-J. Koo, M. H. Whangbo, I. Heinen, T. Klausa, P. Kircher, W. Strunz
Orotidine-5'-monophosphate decarboxylase (ODCase) from Methanobacterium thermoautotrophicum has been crystallized with and without the inhibitor 6-azaUMP by the vapour-diffusion method. In the absence of the inhibitor, the protein crystallizes in space group P4(1)2(1)2 (unit-cell parameters a = b = 56.9, c = 124.5 A)…
Abstract Alkaline cellulase from Bacillus sp. KSM‐635 (EC 3.2.1.4) had reproducible detergent effects on cotton cloth that was artificially or naturally soiled with oily and/or particulate matter, under European washing conditions. The detergent effects of the cellulase, in combination with surfactants, apparently wer…
The influence of the surface treatment on the Sm-A-N phase transition of the 8CB (octylcyanobiphenyl) liquid crystal confined to controlled pore glass (CPG) matrices is studied. The characteristic linear size of voids in the chosen CPG matrix is 0.2 &mgr;m. The voids' surface was either nontreated or silane treated en…
Tin bronze (Cu-8%Sn) was cast into cylindrical samples using a unidirectional solidification device monitored by thermocouples. Four cylindrical samples were obtained under four different experimental conditions where pouring temperature, heat extraction and addition of inoculant changed. Thermocouple temperature curv…
The transformation of an andalusite (Al 2 O 3 ·SiO 2 = A) single-crystal to 3:2-mullite (3Al 2 O 3 ·2SiO 2 = M) and non-crystalline silica (SiO 2 ) was investigated at the (100) A and (010) A faces using electron microscopy. The transformation starts topotactically at the surfaces producing a dense layer of mullite an…
Ba 2 Co 2 Fe 28 O 46 nanocrystals were synthesized through a stearic acid sol–gel method. The reaction temperatures were notably lower than that of the conventional ceramic method. The nanocrystalline particles obtained at 750 °C were spherical in shape with grain sizes ranging from 10 to 25 nm. Their morphology becam…
We fabricated bismuth (Bi) nanowires with low energy electron beam lithography using silver (Ag) nanocrystal shadowmasks and a subsequent chlorine reactive ion etching. Submicron-size metal contacts on the single Bi nanowire were successfully prepared by in situ focused ion beam metal deposition for transport measurem…
1,5-dioxepan-2-one (DXO) is presented as a versatile component in biodegradable polymers for biomedical applications. Copolymerization of DXO and L-lactide yielded a semi-crystalline, yet flexible, material where the extent of crystallinity and erosion characteristics were controlled by an appropriate choice of copoly…
The biological colonisation of stainless steel surfaces (AISI 304 resp. 316L) was investigated by monitoring the development of natural biofilms, axenic biofilms with selected laboratory strains, and axenic biofilms with a natural biofilm isolate. Digital image analysis of epifluorescence microscopic photographs for q…
In this paper, finite element analysis (FEA) of a hysteresis motor using a magnetization-dependent model is presented. The hysteresis loop in the hysteresis ring is calculated from the maximum flux density which is obtained by the FEA. The proposed method is applied to a sample motor and the simulation result shows a…
Abstract The coordination compounds of the general formula Ln(HL) 2 (NO 3 ) 3 , (where Ln = La - Eu (without Pm), HL = C 6 H 5 C(O)NHP(O)[N(CH 3 ) 2 ] 2 , N,Nʹ-tetramethyl-Nʺ-benzovlphosphoryl-triamide) have been synthesized and characterized by means of IR, UV-VIS, 1 H, 31 P NMR spectroscopy, and X-ray analysis. The…
Abstract A new grafting method was developed to incorporate maleic anhydride directly onto solid‐state polypropylene powders. Maleic anhydride grafts altered the nonpolar characteristics of polypropylene so that much better mixing was achieved in blends and composites of polypropylene with many other polymers and fill…
This paper deals with the direct inclusion of vector hysteresis and eddy current losses in a 2D finite element (FE) time stepping analysis. It is shown that a vector Preisach model can be inverted in an efficient way by means of the Newton-Raphson method and that it thus can easily be included In the Newton-Raphson it…