Materials Literature
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A novel approach to highly ordered and modular nanoelectrode arrays (NEAs) has been developed using block copolymer self-assembly. Variable scan rate cyclic voltammetry studies were performed to characterize the NEA. At low scan rates, the NEA behaves similar to a macroelectrode, while at high scan rates the nanoelect…
Amino acids involved in cottonseed protein cross-linking by formaldehyde, glutaraldehyde, and glyoxal during protein film formation were identified by an original technique. The entire HPLC amino acid profile (after acid hydrolysis) was studied, along with variations in reactive lysine contents, in films cross-linked…
Within a phase field approach which takes the strain-induced elasticity into account, the kinetics of the coherent order-disorder transition is investigated for the specific case of $Al_3 Zr$ alloy. It is shown that a microstructure with cubic $L1_2$ precipitates appears as a transient state during the decomposition o…
It is shown that the appearance of a multidimensional potential energy surface, or potential energy landscape, can be related to the form of the interatomic or intermolecular potential. Catastrophe theory enables us to describe how the geometry of the surface changes with parameters in the potential, and provides univ…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBismuth Nanotubes: A Rational Low-Temperature Synthetic RouteYadong Li, Junwei Wang, Zhaoxiang Deng, Yiying Wu, Xiaoming Sun, Dapeng Yu, and Peidong YangView Author Information Department of Chemistry Tsinghua-Foxconn Nanotechnology Laboratory and the Key Laboratory of…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDistinct Complex Precipitating from Racemic Solution of Poly(β-benzyl l-aspartate) and Poly(β-benzyl d-aspartate)Kou-ichi Sakajiri, Ei-ichi Kawasaki, and Junji WatanabeView Author Information Department of Organic and Polymeric Mate…
A novel method for fabricating optical channel waveguides in Ga:La:S chalcogenide glass, through continuous wave direct UV laser writing (λ = 244 nm) is reported. Well-formed singlemode channel structures, with low propagation losses of 0.38 ± 0.05 dB/cm at 1.3 µm, were engineered using this technique.
Abstract The article describes the synthesis and characterization of N‐aryl itaconimide monomers such as: N‐( p ‐chlorophenyl) itaconimide (PI)/N‐( m ‐chlorophenyl) itaconimide (MI)/N‐( o ‐chlorophenyl) itaconimide (OI) and its copolymerization behavior with MMA. The homopolymers and copolymers of N‐aryl itaconimides…
The vibrational density of states and phonon specific heat of Si nanocrystals are studied by means of a lattice dynamical calculation. The vibrational density of states of Si nanocrystals is distinct from the bulk one at low and high frequencies owing to the finite-size effect. At low frequencies there is an excess of…
We present a theory of the Nb-ion off-centre displacements and ferroelectric phase transition in dilute KTa 1- x Nb x O 3 . We believe that this theory is generally applicable to ferroelectric transitions in incipient ferroelectrics induced by impurities. We show that the non-uniform strong intraband electron-phonon i…
The nitridation of an amorphous ZrO 2 ·H 2 O precursor with gaseous ammonia has been studied by in situ X-ray powder diffraction (temperature range 25−1100 °C), electron diffraction (temperature range 25−800 °C), and electron energy loss spectroscopy (EELS) using a transmission electron microscope equipped with an env…
Abstract Branched polystyrene macromonomers were synthesized by the slow addition of a stoichiometric amount of either 4‐(chlorodimethylsilyl)styrene or vinylbenzyl chloride as a coupling agent to living polystyryllithium. Star‐shaped macromonomers were produced by the addition of the coupling agent alone, and hyperbr…
Abstract A range of ethylene/norbornene copolymers were synthesized using the commercially available rac ‐Et(Ind) 2 ZrCl 2 metallocene catalyst. A large window of norbornene contents, between 30 and 55 mol % was used to facilitate the interpretation of the results. The polymers were characterized by means of wide‐angl…
The synthesis and a preliminary structural characterization of syndiotactic poly( m -methylstyrene) are reported. A complex polymorphic behavior has been revealed. Three different polymorphic forms and two clathrate structures, characterized by the inclusion of guest molecules in the crystalline lattice, have been fou…
To furnish new insight into structure−property relationships governing glassy nematic liquid crystals, novel material systems were synthesized and characterized. Highly ordered, solid films were also prepared via spin-coating for the determination of optical birefringence. It was found that a linear nematogen, such as…
The field-dependent low-temperature specific heat of an optimally doped polycrystalline sample of ${\mathrm{La}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{MnO}}_{3}$ ${(T}_{C}=265\mathrm{K}),$ $1<~T<~32\mathrm{K}$ and $0<~H<~9\mathrm{T}$ was analyzed by a global least-square fit to separate the hyperfine, electro…
Abstract The rheological behavior of polypropylene, PP, ethylene‐propylene copolymer, EPR, and EPR/PP blends was studied. Zero‐shear viscosity and elastic relaxation time were determined by least‐squares fits by using a Carreau–Yasuda model with Arrhenius temperature dependency. The effect of PP and EPR molecular weig…
Abstract The average rubber particle size, size distribution, and matrix ligament thickness between particles in polypropylene blends containing metallocene catalyzed ethylene–octene copolymers have been quantitatively analyzed, as functions of blend composition and phase viscosity ratio. Comparison has been made betw…
Abstract The effect of processing conditions and elastomer content on the toughening of Polypropylene (PP) by melt blending with styrene/ethylene‐butylene/styrene tri‐block copolymer (SEBS) in a twin‐screw extruder has been investigated. The parameters analyzed were: temperature profile, screw speed, and feed rate of…
Nanoscale dispersion of only a few weight percentage of layered silicate (montmorillonite) in nylon 6 and epoxy results in the formation of a uniform passivating and self-healing inorganic surface region upon exposure to oxygen plasma. The enrichment of inorganic is compositionally graded with respect to the surface a…