Materials Literature
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In a previous work [ Macromolecules 2000, 33, 8344], nanocomposite materials were obtained using glycerol plasticized starch as the matrix and a colloidal suspension of tunicin an animal cellulose whiskers as the reinforcing phase. The mechanical behavior of resulting films was characterized in both the linear and the…
The main problem with Shape Memory Alloy (SMA) actuators is their slow response speed. Current SMA actuators work in tens of seconds though they can generate large force and displacement outputs. The objective ofthe research in this paper is to improve the response speed of SMA actuators to 1 0 milliseconds or less. S…
It has been generally believed that polar residues are usually located on the surface of protein structures. However, there are many polar groups in the interior of the structures in reality. To evaluate the contribution of such buried polar groups to the conformational stability of a protein, nonpolar to polar mutati…
In this study we analyzed observed Raman data for the frequencies of the disorder-induced modes of ν7 (93 cm−1) and ν5 (144 cm−1) in the second order phase region of NH4Cl (P = 2.8 kbar). By means of a power-law formula describing the critical behaviour of the frequency shifts for those phonon modes studied, we extrac…
A detailed discussion is given of the predictions of the Landau-Devonshire theory for the behavior of thin ferroelectric films. It is assumed that the phase transition in the bulk is second order, and the theory is extended by the inclusion in the free-energy density of a term proportional to $|\ensuremath{\nabla}P{|}…
The adsorption isotherm of N 2 in internal nanopores of the single wall carbon nanohorn (SWNH) particles was compared with that of the external surfaces of the SWNH assembly. The presence of two strong adsorption sites of the internal nanopores and external nanopores of the assembly were evidenced by the analysis of t…
In this work we report injury to isolated red blood cells (RBCs) due to focused shock waves in a cavitation-free environment. The lithotripter-generated shock wave was refocused by a parabolic reflector. This refocused wave field had a tighter focus (smaller beam width and a higher amplitude) than the lithotripter wav…
This paper provides an overview of mechanisms for high-pH and near-neutral pH stress corrosion cracking of underground pipelines. Characteristics and historical information on both forms of cracking are discussed. This information is then used to support proposed mechanisms for crack initiation and growth.
In the presence of a magnetic field applied perpendicular to a thin sample layer, a suspension of magnetic colloidal particles (ferrofluid) can form spatially modulated phases with a characteristic length determined by the competition between dipolar forces and short-range forces opposing density variations. We introd…
The surface discharge of electrified dielectrics at high humidity is considered. The percolative nature of charge transport in electrets is established. Particular attention is given to the phenomena of adsorption and nucleation of electrically conducting phase in the cause of percolation cluster growth on electrified…
We present a nonlocal Monte Carlo algorithm with particle swaps that greatly accelerates thermalization of soft sphere binary mixtures in the glassy region. Our first results show that thermalization of systems of hundreds of particles is achievable, and find behavior compatible with a thermodynamic glass transition.
Magnetically anisotropic Sm 1- x Gd x Co 5 (0⩽ x ⩽0.5) ribbons have been prepared by single-roller melt spinning at a low wheel speed of 5 m s -1 . X-ray diffraction results show that the substitution of Gd for Sm enhances the relative intensity of the diffraction peak of index (200) and favours the formation of a str…
Abstract A novel computational technique to generate close‐to‐equilibrium crosslinked polymeric systems is proposed. Compared to the current state‐of‐the‐art equilibration methods, the new technique appears to be faster by several orders of magnitude. The main advantage of the technique is that one can circumvent the…
The unexpectedly long time scale for development of melt adhesion strength in blown films of molecularly heterogeneous Ziegler−Natta ethylene copolymers previously led to speculation on the existence of a surface layer enriched in low molecular weight, highly branched fractions. In the present study the hypothesis was…
Spherical micron particles of crystalline titanium dioxide (TiO 2 ) were synthesized by in-flight oxidation of titanium carbide (TiC) micron powders (mean diameter: 28 μm) in argon−oxygen thermal plasma. The extent of oxidation of TiC powders increases with the flow rate of oxygen in the plasma gases (Ar + O 2 ), and…
Abstract The dumbbell‐like/egglike microspheres of poly(4‐vinylpyridine/ n ‐butyl acrylate)/polystyrene [P(4VP/nBA)/PS] were prepared by soap‐free seed emulsion polymerization. The effects of various polymerization parameters, such as the amount of ethyl acetate (EA) in the continuous phase, swelling time, degree of c…
Abstract In this study, polymethyl methacrylate (PMMA)‐coated talc was produced by the in situ polymerization of methyl methacrylate on the talc surface. The polymerization reaction was performed by both batch and semicontinuous emulsion processes. The polymerization kinetics, particle size and distribution, grafting…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTClathrate III of Group 14 Exists After AllSvilen Bobev and Slavi C. SevovView Author Information Department of Chemistry and Biochemistry University of Notre Dame, Notre Dame, Indiana 46556 Cite this: J. Am. Chem. Soc. 2001, 123, 14, 3389–3390Publication Date (Web):Mar…
Vanadium pentoxide (V 2 O 5 ) thin films have been produced by pulsed laser deposition. AFM, Raman, optical and electrical measurements have been made on the films in order to understand the growth mechanism of laser ablated V 2 O 5 thin films. The investigations revealed the growth of stoichiometric and high-quality…
Abstract A soluble polyimide prepared from 7,7′‐bis(4‐aminophenoxy)‐4,4,4′,4′‐tetramethyl‐2,2′‐spirobichroman and 4,4′‐hexafluoroisopropylidenediphthalic anhydride was mixed with organo‐modified montmorillonite or synthetic mica in N,N ‐dimethylacetamide. The content of the clay minerals was 1, 2, and 4 wt %, respecti…