Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A microscopic integral equation theory of elasticity in polymer liquids and networks is developed which addresses the nonclassical problem of the consequences of interchain repulsive interactions and packing correlations on mechanical response. The theory predicts strain induced softening, and a nonclassical intermole…
We present first principles electronic structure calculations and photoemission measurements of the change in the valence band DOS of germanium as its dimensions are reduced from the bulk to the nanoscale. By comparing the calculated broadening of the s and s − p band peaks and the energy of surface dangling bonds to…
Electronic structure calculations of $\ensuremath{\gamma}\ensuremath{-}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$ are presented and compared to the electronic structure of the more commonly known $\ensuremath{\alpha}\ensuremath{-}{\mathrm{V}}_{2}{\mathrm{O}}_{5}.$ The different ${\mathrm{VO}}_{5}$ building blocks in $\ensurema…
Oligomerization directs active site formation in homotrimeric 2'-deoxyuridine triphosphate pyrophosphatases (dUTPases). Stability of the homotrimer is a central determinant in enzyme function. The present comparative studies of bacterial and fruitfly dUTPases with homologous 3D structures by differential scanning micr…
Abstract This article contains a detailed analysis of the melting process of poly(butylene terephthalate) performed by means of temperature‐modulated differential scanning calorimetry at various temperature‐modulation frequencies. The modulation period largely affects the apparent reversing specific heat capacity ( c…
A series of meso-amidoporphyrins were facilely synthesized by direct reactions of meso-brominated porphyrins with amides via palladium-catalyzed amidation reaction. Using a combination of palladium precursor Pd(OAc)(2) or Pd(2)(dba)(3) and phosphine ligand Xantphos, both 5-bromo-10,20-diphenylporphyrin and 5,15-dibrom…
We report the preparation of two-component microcapsules by a method termed core-mediated layer-by-layer (LbL) growth, which utilizes a core particle to mediate the formation of thin multilayer coatings on particles, followed by core removal. In the first (model) system to demonstrate the process, multilayers were pre…
The binary poly(acetoxystyrene)/poly(ethylene oxide) (PAS/PEO) blend system is fully miscible, as evidenced by a single glass transition temperature over a full range of compositions when analyzed by differential scanning calorimetry analysis, as a result of weak C−H···O hydrogen-bonding interactions between the carbo…
The ability of monocytes to adhere, differentiate into macrophages, and fuse to form foreign body giant cells (FBGCs) on an implanted material surface is a critical step toward biomaterial degradation. Novel homogeneous surfaces were utilized to mediate adhesion. These surfaces consisted of N-(2 aminoethyl)-3-aminopro…
Abstract We report on the hybrid organic‐inorganic 2‐D materials (CsNa 2 [{Sn(CH 3 ) 2 } 3 (H 2 O) 4 (β‐AsW 9 O 33 )]·7H 2 O) ∞ ( 1a ) and the isomorphous (CsNa 2 [{Sn(CH 3 ) 2 } 3 (H 2 O) 4 (β‐SbW 9 O 33 )]·7H 2 O) ∞ ( 2a ) which crystallize in the orthorhombic system, space group Pna 2 1 , with identical unit cell p…
The use of 4.2 nm gold nanoparticles wrapped in an adsorbates shell and embedded in a TiO2 metal oxide matrix gives the opportunity to investigate ultrafast electron-electron scattering dynamics in combination with electronic surface phenomena via the surface plasmon lifetimes. These gold nanoparticles (NPs) exhibit a…
ZnO nanorods were epitaxially grown by metalorganic chemical vapour deposition (MOCVD) on sapphire (0001) and substrates. The nanorods were elongated along the ZnO c-axis which was parallel to the substrate normal. Good alignment among the rods was achieved both in the length direction and in the in-plane orientations…
We discuss the polarization properties and first‐order diffraction efficiencies of volume phase holographic (VPH) transmission gratings, which can be exploited to improve the throughput of modern spectrographs. The wavelength of peak efficiency can be tuned by adjustment of the incidence angle. We show that the variat…
Abstract Viscosity and cure time of a filled rubber compound having an accelerated sulfur cure system are affected by types and contents of the rubber and the filler as well as of the curatives. Bound rubber content is used as level of the reinforcement. Influence of bound rubber on viscosity and cure time of a rubber…
Metallcluster in einer Proteinkapsel: Solche in situ durch chemische Reduktion von Palladium(II)-Ionen im Apoferritin-Käfig erzeugte Cluster ermöglichen größenselektive Olefin-Hydrierungen wegen der durch die Ferritinkanäle bedingten Größenlimitierung (siehe Schema).
The role of the double-hydrophilic block copolymer poly(ethylen glycol)-block-poly(methacrylic acid) (PEG-b-PMAA) on the morphogenesis of calcium carbonate (CaCO3) was studied by applying the contrast variation small angle neutron scattering technique. The morphology and size of CaCO3 crystals is strongly affected by…
The lyotropic phase behavior of cuboidal particles was investigated via Monte Carlo simulations. Hard cubes were approximated by suitably shaped clusters of hard spheres. Changes in concentration and structure of the system were monitored as a function of osmotic pressure P* (imposed in an isobaric ensemble). As expec…
Biodegradable elastomers represent a useful class of biomaterials. In this paper, we synthesize thermoset elastomers by utilizing the living nature of ring-opening polymerization of a star copolymer of D,L-lactide and epsilon-caprolactone initiated with glycerol and catalyzed by stannous 2-ethylhexanoate. The star cop…
The structure of polymers in the vicinity of spherical colloids is investigated by Monte Carlo simulations and integral equation theory. Polymers are represented by a simple bead-spring model; only repulsive Lennard-Jones interactions are taken into account. Using advanced trial moves that alter chain connectivity, de…
We directly measure the photoinduced insulator-to-metal transition in ${\mathrm{VO}}_{2}$ using time-resolved near-edge x-ray absorption. Picosecond pulses of synchrotron radiation are used to detect the redshift in the vanadium ${L}_{3}$ edge at 516 eV, which is associated with the transient collapse of the low-tempe…