Materials Literature
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Heat generation in metals during high‐strain‐rate plastic deformation was investigated. Experiments were designed to measure the partition of plastic work into heat and stored energy during dynamic deformations under adiabatic conditions. A Kolsky pressure bar was used to determine mechanical properties at high strain…
An asymmetric hybrid energy storage device has been built using a lithium titanate intercalation anode and the pseudocapacitive electronically conducting polymer poly(fluorophenythiophene). Results show that the device operates in the power range of electrochemical double-layer capacitors, while having three to four t…
Abstract Raman spectra of chillagite, wulfenite, stolzite, scheelite and wolframite were obtained at 298 and 77 K using a Raman microprobe in combination with a thermal stage. Chillagite is a solid solution of wulfenite and stolzite. The spectra of these molybdate minerals are orientation dependent. The band at 695 cm…
A series of ortho isomers of meso-tetrakis(N-alkylpyridyl)porphyrins (alkyl being methyl, ethyl, n-propyl, n-butyl, n-hexyl, and n-octyl) and their Mn(III) complexes were synthesized and characterized by elemental analysis, uv/vis spectroscopy, electrospray ionization mass spectrometry and electrochemistry. An increas…
Sisal fibers have been used for the reinforcement of polypropylene matrix. The compatibilization between the hydrophilic cellulose fiber and hydrophobic PP has been achieved through treatment of cellulose fibers with sodium hydroxide, isocyanates, maleic anhydride modified polypropylene (MAPP), benzyl chloride and by…
For the construction of ultra super critical (USC) power plant, 9Cr-3W base ferritic heat-resistant steels with relatively high B and no N have been investigated. Authors have been revealed in the previous report that the addition of 139ppm B significantly improves creep strength of the steels, whereas most of added B…
The AraC-XylS database contains information about a family of positive transcriptional regulators broadly distributed in bacteria. This specific database focuses on protein sequences and on the biological and functional features of each of the proteins that belong to this family. Each entry provides information on the…
Magnetically controlled shape memory materials are a new w ay to p roduce motion and force. The material changes s hape in a magnetic field. Shape c hanges are e ven l0 p ercent and response time is less than a millisecond. Usual applications of the material are ac tuators that produce linear motion. In this article s…
Escherichia coli K-12 can ferment L-ascorbate. The operon encoding catabolic enzymes in the utilization of L-ascorbate (ula) has been identified; this operon of previously unknown function had been designated the yif-sga operon. Three enzymes in the pathway that produce D-xylulose 5-phosphate have been functionally ch…
Front-surface external reflection infrared spectroscopy was used to study a set of samples of poly(ethylene terephthalate) (PET) corresponding to various states of order: highly amorphous, drawn at 80 °C to different draw ratios, and thermally crystallized under different conditions. Kramers−Kronig transformation prov…
This article reviews controlled release from crosslinked degradable networks. Network formulations include those derived from wholly synthetic components, natural components, and combinations thereof. This includes, but is not limited to, poly(orthoesters), poly(anhydrides), poly(ethylene glycol) (PEG) derivatives, an…
Complete exfoliation of montmorillonite during Ti-based Ziegler-Natta polymerization of ethylene has been successfully carried out by using montmorillonite (MMT-OH) modified with intercalation agents containing hydroxyl groups. Hydroxyl groups in intercalation agents offer facile reactive sites for anchoring catalysts…
Titania nanostructures with larger surface areas are fabricated on a glass substrate by anodization of sputtered aluminum and the sol−gel process, and the structural characteristics of the nanostructures are investigated. Highly pure aluminum film (99.99%, ≈2 μm), which is deposited on a glass substrate with a conduct…
Surface treatments have long been utilized to modify the chemical and physical structures of the surface layers of textile fibers, thus improving the properties of fibers in many applications. This review discusses the feasibility and characteristics of different methods of surface modification of polymeric textile fi…
Triblock polymers, poly(ethylene oxide- b -propylene oxide- b -ethylene oxide) (PEO- b -PPO- b -PEO), are used as molecular templates in poly(methyl silsesquioxane) (MSQ) matrixes to fabricate nanoporous organosilicates for low dielectric constant applications. The results show that aggregation of block copolymers in…
We report the template-guided synthesis of water-soluble chiral conducting polymer nanocomposites. This synthetic route is facile and can be carried out on a large scale easily. Synthesis of water-soluble polyaniline nanocomposites is achieved by careful control of experimental parameters such as acid concentration, i…
Recent progress in grain refinement of steels was overviewed. After energetic research works since middle 1990's including big national projects in Japan, ultrafine grained steels whose mean grain size is smaller than 1μm have been realized. There are principally two ways to obtain ultrafine grained structure in steel…
A new tetranuclear double-open dicubane complex [Ni4(mu 2-N3)4(mu 3-N3)2(N3)2(enbzpy)2].2H2O (enbzpy = [N,N-bis(pyridin-2-yl)benzylidene]ethane-1,2-diamine) has been characterised structurally and magnetostructurally.
Four biodegradable polyurethane blends were made from segmented polyurethanes that contain amino acid-based chain extender and diisocyanate groups. The soft segments of these parent polyurethanes were either polyethylene oxide (PEO) or polycaprolactone (PCL) diols. The blends were developed to investigate the effect o…
Surface properties have an enormous effect on the success or failure of a biomaterial device, thus signifying the considerable importance of and the need for adequate characterization of the biomaterial surface. Microscopy techniques used in the analysis of biomaterial surfaces include scanning electron microscopy, tr…