Materials Literature
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Changes in the optical properties of an alkynyldigold(I) complex upon reaction with Cu(I) are associated with a complicated structural change to form an unusual Au4Cu2 cluster with metallophilic interactions as well as pi-alkyne coordination.
Structures and relative stability of four families of low-lying silicon clusters in the size range of Sin(n=21-30) are studied, wherein two families of the clusters show prolate structures while the third one shows near-spherical structures. The prolate clusters in the first family can be assembled by connecting two s…
Enthalpies for the beta-scission reactions, R'SC(*)(Z)SR --> R'SC(Z)=S + (*)R (for R, R' = CH(3), CH(2)CH(3), CH(2)CN, C(CH(3))(2)CN, CH(2)COOCH(3), CH(CH(3))COOCH(3), CH(2)OCOCH(3), CH(2)Ph, C(CH(3))(2)Ph, and CH(CH(3))Ph and Z = CH(3), H, Cl, CN, CF(3), NH(2), Ph, CH(2)Ph, OCH(3), OCH(2)CH(3), OCH(CH(3))(2), OC(CH(3…
Novel thermosetting copolymers, ranging from tough and ductile to very soft rubbers, have been prepared by the cationic copolymerization of regular (SOY) and 100% conjugated soybean oils (C(100)SOY) with dicyclopentadiene (DCP) catalyzed by Norway fish oil (NFO)-modified and SOY- and C(100)SOY-diluted boron trifluorid…
Ring-opening polymerization of ε-caprolactone initiated by titanium n -propoxide Ti(O- n -Pr) 4 was compared to the one initiated by titanium phenoxide or Ti(OPh) 4 . Polymerization was confirmed to proceed via a coordination−insertion mechanism for both initiators after end groups analysis by 1 H and 13 C NMR (nuclea…
To potentially cure neurodegenerative diseases, we need to understand on a molecular level what triggers the complex folding mechanisms and shifts the equilibrium from functional to pathological isoforms of proteins. The development of small peptide models that can serve as tools for such studies is of paramount impor…
Nanocomposite scaffolds based on nanofibrous poly(epsilon-caprolactone) (PCL) and nanohydroxyapatite (nanoHA) with different compositions (wt%) were prepared by electrostatic co-spinning to mimic the nano-features of the natural extracellular matrix (ECM). NanoHA was found to be well dispersed in polymers up to the ad…
Foreword. Preface. Symbols and abbreviations. Fiber optic fluorescence thermometry: An introduction. Temperature dependences of Cr3+ fluorescence lifetimes. Phase-locked detection of fluorescence lifetime. Cr3+ fluorescence thermometers and applications of PLD. Alexandrite based fluorescence thermometry. Cr:LiSAF base…
There is considerable interest in the adhesion of polymers to carbon nanotubes for nanocomposite applications.(1-4) One example is multiwalled carbon nanotubes (MWCNTs) dispersed in nylon 6,6.(5) We will show that high-contrast tomographic reconstructions can be created from plasmon-loss electrons that show the three-…
The generation of porous silica with hierarchically organized bimodal mesoporosity of adjustable size and well-defined shape was investigated by using surfactant mixtures and the nanocasting procedure (liquid crystalline templating). A systematic study of combinations of various block copolymers (Pluronics F127, KLE (…
Niobium pentoxide reacts actively with concentrate NaOH solution under hydrothermal conditions at as low as 120 degrees C. The reaction ruptures the corner-sharing of NbO(7) decahedra and NbO(6) octahedra in the reactant Nb(2)O(5), yielding various niobates, and the structure and composition of the niobates depend on…
SummaryIn the manganese oxides with perovskite-type structure, various instabilities competing with the double exchange interaction play important roles, which depends on the effective one-electron band width and the nominal hole concentration. As one such example, the magnetic field induced metal-insulator phenomena…
The general way to derive constitutive equations for different phenomena, coupled or not, is briefly described with an emphasis on the choice of state variables and analytical expressions for the state potential and the (pseudo) potential of dissipation by qualitative experiments. Quantitative experiments are used to…
c -Axis-oriented ultra thin SrBi 2 Ta 2 O 9 films were epitaxially grown on atomically flat (100)SrTiO 3 substrates by pulse-gas-introduced metalorganic chemical vapor deposition, and their growth behavior was observed by atomic force microscopy (AFM). Growth-time-resolved AFM images clearly showed that a completely f…
On the one hand, at the scale of the crystal, a very “smart” mathematical theory of martensitic transformation is described. On the other hand, two more classical ones, the first at the mesoscopic scale (“meso-macro” self consistent integration), the second at the macroscopic scale, based on the thermodynamics of irre…
A joint theoretical and experimental study of the electronic and structural properties of liquid crystalline\nmetal-free phthalocyanines bearing a strong potential for charge and exciton transport has been performed.\nThe synthesis of such compounds has been triggered by quantum chemical calculations showing that: (i)…
Carbon inverse opals with three-dimensional nanoporous structures are fabricated by a template method using synthetic opals formed by the sedimentation of SiO2 spheres. The pore size of the carbon inverse opals ranges widely from about 74 nm to 550 nm depending on the diameter of the SiO2 spheres. These nanoporous str…
Azotobacter chroococcum MAL-201 (MTCC 3853), a free-living nitrogen-fixing bacterium accumulates poly(3-hydroxybutyric acid) [PHB, 69% of cell dry weight (CDW)] when grown on glucose and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [PHBV with 19.2 mol% 3HV] when grown on glucose and valerate. Use of ethylene glycol (E…
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This note reviews hyphenated size exclusion chromatography (SEC) techniques and compares polyisobutylene SEC analyses by multi-angle laser light scattering and viscometry. The weight-average molecular weight and number-average molecular weight were found to be independent of the molecular weight measurement technique…