Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSpontaneous Organization of Helical Polypeptide Molecules into Polar Packing StructureChu-Chun Yen, Masatoshi Tokita, Byoungchoo Park, Hideo Takezoe, and Junji WatanabeView Author Information Department of Organic and Polymeric Mate…
The crystal structure of ampicillin trihydrate {systematic name: 6-[d(−)-α-aminophenylacetamido]penicillanic acid trihydrate}, C16H19N3O4S·3H2O, a broad-spectrum β-lactam antibiotic of the aminopenicillin type, has been determined from synchrotron X-ray powder diffraction data. The three water molecules form an in…
In zero gravity, liquid does not drip from a tube but hangs from it for all time as a pendant drop. It is shown that a drop can be made to fall off a tube by heating the contact line (CL), which causes a temperature gradient between the drop's CL and its tip. Simulations show that whether a drop detaches from or remai…
In the QM/MM method we have developed (LSCF/MM), the QM and the MM parts are held together by means of strictly localized bonding orbitals (SLBOs). Generally these SLBOs are derived from localized bond orbitals (LBOs) that undergo tails deletion, resulting in a nonpredictable change of their properties. An alternative…
The recovery of homogeneous polyoxometallate (POM) oxidation catalysts from aqueous and non-aqueous media by a nanofiltration process using mesoporous gamma-alumina membranes is reported. The recovery of Q(12)[WZn(3)(ZnW(9)O(34))(2)] (Q=[MeN(n-C(8)H(17))(3)](+)) from toluene-based media was quantitative within experim…
Abstract This article discusses the characterization of arborescent (hyperbranched) polyisobutylenes (arb‐PIBs) by size exclusion chromatography and differential scanning calorimetry, in comparison with linear PIB standards. The radius of gyration (〈 r 〉 1/2 = R z ), measured from the angle dependence of light scatter…
We investigate spinodal decomposition kinetics of an initially nematic dispersion of rodlike viruses. Quench experiments are performed from a flow-stabilized homogeneous nematic state at a high shear rate into the two-phase isotropic-nematic coexistence region at a zero shear rate. We present experimental evidence tha…
Abstract Natural cellulosic fibers, including hemp, are increasingly being used for composite reinforcement. However, their poor adhesion with synthetic resins limits their use as reinforcing agent. It is generally accepted that interfacial adhesion can be best described in terms of dispersion forces and acid–base int…