Materials Literature
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The crystal structure of pentamethylcyclopentadienylsodium, [NaC10H15] (NaCp*), has been determined from high-resolution X-ray powder diffraction. The compound crystallizes in space group Cmcm with lattice parameters a = 4.61030 (3), b = 16.4621 (3), c = 14.6751 (2) A, V = 1113.77 (4) A(3) (Z = 4). NaCp* forms polymer…
Poly(aspartic acid) (PAA) hydrolase was purified from Sphingomonas sp. KT-1 (JCM10459). The purified hydrolase degraded thermally synthesized PAA to oligomers. The molecular mass of PAA hydrolase was 30 kDa and the isoelectric point was 8.9. The optimum values of pH and temperature for PAA degradation were 10.0 and 40…
The synthesis, thermal behavior, and bulk microstructure of fluorinated new liquid-crystalline polyacrylates containing spaced fluoroalkylphenyl units in the side chains were studied. While in polyacrylates poly (1) and poly (2) there was a 4-(perfluorooctylethoxy)phenyl benzoate unit, i.e., a two-phenyl mesogenic cor…
Infrared spectroscopy coupled with adsorption of probe molecules such as CO and NO was used to investigate the surface adsorption properties of reduced Ru and Ru−Pt/NaY catalysts. CO adsorption at room temperature on the monometallic catalyst yielded three main bands at 2145, 2088, and 2031 cm -1, which were assigned…
The nanostructure deformation mechanism of a predrawn and annealed poly(ether ester) (PEE) thermoplastic elastomer comprising poly(butylene terephthalate) as hard segments and poly(ethylene glycol) as soft segments of a weight ratio 57/43 was studied by means of synchrotron radiation. For this purpose a recently propo…
The structure of Langmuir monolayers containing either a lipidated poly(ethylene glycol) (PEG-lipid) or a lipidated peptide (peptide-amphiphile) or a binary mixture of both was studied using neutron reflectivity. The PEG portion of the PEG-lipid extends into the water, forming dense polymer “brushes”. The PEG volume f…
Reflux-treated poly(methylsilane) (PMS) at 420−570 K improves its ceramic yield dramatically. This efficient process was investigated by TG, GC, 29 Si, 13 C, and 1 H NMR, and FT-IR methods. The structural transformation process of the PMS polymer consists of three stages. In the first stage below 500 K, PMS forms Si−S…
X-ray emission spectroscopy has been applied to examine the electronic structure of onion-like carbon (OLC) generated by the annealing treatment of nanodiamonds (ND). The C Kα spectra of OLC produced in the temperature range of 1600−1900 K were found to be markedly different from the spectrum of particles formed at 21…
The crystal structure of hexagonal ytterbium manganese oxide, YbMnO3, has been refined at room temperature. It is isomorphous with YMnO3. The Mn ions lie near the centre of a trigonal bipyramid. Although the Yb ions lie on threefold axes, the apical oxygen ions are at dissimilar distances, leading to ferroelectric be…
The two metal sites in cadmium substituted beta-lactamase from Bacillus cereus 569/H/9 have been studied by NMR spectroscopy ((1)H, (15)N, and (113)Cd) and PAC spectroscopy ((111m)Cd). Distinct NMR signals from the backbone amides are identified for the apoenzyme and the mononuclear and binuclear cadmium enzymes. For…
In the preceding paper of this series we studied the effect of several oils of different chemical structure on the foaming properties of sodium dodecylbenzenesulfonate solutions. A straightforward correlation was found between the foam stability and the so-called “entry barrier”, which prevents the emergence of pre-em…
Random bulk polycondensation and the slow monomer addition (SMA) strategy have been employed for the preparation of hyperbranched aromatic homo- and copolyesters, based on 3,5-bis(trimethylsiloxy)benzoyl chloride (AB 2 monomer) and 3-(trimethylsiloxy)benzoyl chloride (AB comonomer). Whereas random copolycondensation i…
The syntheses of novel dendrimers composed of glycerol and succinic acid are described. These “biodendrimers” are composed entirely of building blocks known to be biocompatible or degradable in vivo to natural metabolites and are prepared using a high yield divergent approach. Moreover, the synthetic strategy employed…
Foam tests and model experiments with sodium dodecylbenzenesulfonate solutions are performed to clarify how the foam stability and the foaminess are affected by several oils of different chemical structure. The foam tests show that 2-butyloctanol (2BO, branched alkanol) and isohexyl-neopentanoate (IHNP, branched ester…
Analytical calculations based on finite-size spin-wave theory and Monte Carlo (MC) simulations are performed to investigate the validity of the well-known relation m(H,T)=M(H,T)B_D[M(H,T)NH/T] between the induced magnetization m of the magnetic particle and its intrinsic magnetization M for the Ising and isotropic cla…
Direct spray coating, a new photoresist deposition technique, is investigated to evaluate its potential for pattern transfer on wafers with very large topography. An Electronic Vision EV101 spray coating system is employed and AZ4823 photoresist is selected to form a thick layer of resist on flat wafers and to produce…
The electronic structures and magnetic properties of layered perovskite LaSrMnO 4 and Ca 2 RuO 4 have been determined using the full-potential linearized augmented-plane-wave method within the local spin-density approximation (LSDA) and the LDA + U approach (LDA standing for local density approximation). The results o…
Micro-Raman spectroscopy is applied to study structural changes in the vicinity of the domain walls in ferroelastic lead phosphate Pb 3 (PO 4 ) 2 . The Raman spectra measured in untwinned and in heavily twinned regions of monoclinic Pb 3 (PO 4 ) 2 are studied and the observed differences are analysed on the basis of c…
The effect of temperature on photochromic reaction of amphiphilic spiropyran, 1’,3’-dihydro-3’,3’-dimethyl-6-nitro-1’-octadecyl-8-(docosanoyloxyme thyl)spiro[2H-1-benzopyran-2,2’-(2H)-indole] (SP1822), was investigated in single-component LB films. The morphological changes accompanying the photochromic reaction of SP…
We determine the structural data of seven of the polymorphs of ice (ice Ih, ice Ic, ice IX, ice II, ice VI, ice VII and ice VIII) from ab initio calculations. The dynamical properties have been analysed within the harmonic approximation via a finite-difference evaluation of dynamical matrices from atomic forces. Super…