Materials Literature
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Nanophase separation has been suggested to influence the biological performance of polyurethane. In a previous work, six different 4,4'-diphenylmethane diisocyanate (MDI)-based poly(carbonate urethane)s (PCUs) that exhibited various degrees of nanophase separation were synthesized and characterized. In the present wor…
The microrheology of viscoelastic fluids is obtained from rotational diffusion of optically anisotropic spherical colloidal probes, measured by depolarized dynamic light scattering. The storage and loss moduli obtained from the rotational mean squared displacement is in excellent agreement with those obtained from tra…
Abstract Summary: The crystal structure of the clathrate form of syndiotactic polystyrene containing ortho ‐dichlorobenzene has been determined, and compared with those of the other crystalline clathrate structures of s‐PS already known. This guest molecule, characterized by a quite different shape and volume from the…
Abstract Summary: Wide‐angle X‐ray diffraction (WAXD) was used to investigate the crystal transition of nylon‐12,12 under annealing and drawing. The triclinic α ‐form could be obtained by crystallizing from a melted state or by annealing the γ ‐form at high temperature (above 150 °C). The crystal structure of the α ‐f…
Hemocompatibility is an essential aspect of blood contacting polymers. Knowledge of the relationship between polymer structure and hemocompatibility is important in designing such polymers. In this work, the effect of swelling behavior and states of water on the hemocompatibility of poly(acrylonitrile-co-N-vinyl-2-pyr…
Abstract Summary: Modification of the type I polyhydroxyalkanoate synthase of Ralstonia eutropha (PhaC Re ) was performed through systematic in vitro evolution in order to obtain improved PhaC Re having an enhanced activity of poly(3‐hydroxybutyrate) (PHB) synthesis in recombinant Escherichia coli . For the first time…
Abstract Summary: Poly(methyl methacrylate)s (PMMAs) containing a terminal hydroxy group or multiple hydroxy groups as pendants were grafted to multiwalled carbon nanotubes (MWNTs) by esterification in toluene at 100 °C. The recovered polymer with a low level of MWNTs and the PMMA‐ g ‐MWNTs with up to 12 wt.‐% grafted…
Recent studies have demonstrated that orb-weaving spiders may alter web structures, foraging localities or silk output in response to prey variations. In this study we conducted field surveys and food manipulations to examine whether orb-weaving spiders may also adjust the protein of silk to prey variations. A compari…
Soy protein isolate (SPI) and glycerol were mixed under mild (L series) and severe (H series) mixing conditions, respectively, and then were compression-molded at 140 degrees C and 20 MPa to prepare the sheets (SL and SH series). The glass transition behaviors and microstructures of the soy protein plasticized with gl…
Abstract Summary: Reversible switching between superhydrophobic and superhydrophilic wettability of a polyamide film with a triangular net‐like structure can be achieved by biaxially extending and unloading the elastic film. Both the change of the average side‐length of the triangular net‐like structure upon biaxial e…
We present experimental and theoretical studies of Pd/Cu(100) and Cu/Pd(100) heterostructures in order to explore their structure and misfit strain relaxation. Ultrathin Pd and Cu films are grown by pulsed laser deposition at room temperature. For Pd/Cu, compressive strain is released by networks of misfit dislocation…
The boundary conditions, customarily used in the Landau-type approach to ferroelectric thin films and nanostructures, have to be modified to take into account that a surface of a ferroelectric is a defect of a field type. The surface (interface) field is coupled to a normal component of polarization and, as a result,…
Electronic states in boron-nitride and boron-carbon-nitride nanoribbons with zigzag edges are studied using the extended Hubbard model with nearest neighbor Coulomb interactions. The charge and spin polarized states are considered, and the phase diagram between two states is obtained. Next, the electric capacitance is…
A recent single quantum wire is of sufficient quality to reveal new details of the photoluminescence (PL) evolution with increasing electron--hole (e--h) pair density. At a pair density of 3.6 $\times$ 10$^{3}$ cm$^{-1}$, the PL is characteristic of biexcitons shifted below the exciton peak by the 2.8-meV biexciton bi…
Abstract Ultrafine fibers produced by electrospinning often exhibit bead‐on‐string structures, which have generally been considered to be undesirable “by‐products” or defects. Theoretical analysis in the literature predicted three types of instabilities for an electrically driven jet: the axisymmetric Rayleigh instabi…
An optical investigation of the properties of europium (II) ions introduced in Ba 2 Mg 3 F 10 single crystals is presented. The spectra and time-dependence of both the inter-configurational (f–d) and the intra-configurational (f–f) transitions are described. The emission spectrum consists of two emitting Eu 2+ centres…
We study tagged particle diffusion at large packing fractions, for a model of particles interacting with a generalized Lennard-Jones 2 n – n potential, with large n . The resulting short range potential mimics interactions in colloidal systems. In agreement with previous calculations for short range potentials, we obs…
In the Na x CoO 2 chemical system, a two-phase region is found at ambient temperature near x = 0.75. The manner in which that two-phase region is formed on cooling from a uniform single phase at temperatures above 340 K is reported here. The driving force that induces the phase separation appears to be a difference in…
Nitrogen doped n-type amorphous carbon (n-C:N) films are deposited by a pulsed laser deposition technique at room temperature using a camphoric carbon target with different nitrogen partial pressures (NP) in the range from 0.1 to 800 mTorr. The room temperature conductivity (σ RT ) is found to increase with N incorpor…
The effect of impurities on the phase transitions in the ferroelectric semiconductors TlInS2 and TlGaSe2 , Babaev, S S, Başaran, E, Mammadov, T G, Mikailov, F A, Salehli, F M, Seyidov, MirHasan Yu, Suleymanov, R A