Materials Literature
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Recent experiments on particle-reinforced metal-matrix composite materials have shown particle size effects. Small particles tend to give larger plastic work hardening than large particles at the same particle volume fraction. Prior models used to study the particle size effect are based on the strain gradient plastic…
A novel method to synthesize single-wall carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) nanocomposite by in-situ polymerization in supercritical CO2 is presented. The surfaces of the SWNT bundles were first functionalized with amino ethyl methacrylate (AEMA) followed by co-polymerization with methyl methacryl…
This paper describes the fabrication and evaluation of carbon nanotube (CNT) electrodes grown on stainless steel (SS) plate and wire for electrochemical sensor applications. Multi-wall carbon nanotubes with different diameters were grown on the SS plate and wire by chemical vapor deposition from an ethylene precursor.…
The activation of C O bond in formaldehyde molecule was followed by IR spectroscopy. IR studies showed that the interaction of formaldehyde with Cu + weakens of the C O bond and results in a red shift of the C O IR band (Δν = 56 cm -1 ). The activation of the C O bond is the result of π back-donation of d electrons of…
Abstract Polymer nanocomposites based on PET and with an intercalated and fairly dispersed nanostructure have been obtained in the melt state. The intercalation and dispersion levels, as well as the mechanical properties, were studied by varying the chemical nature and amount of the organic modification of the clay, a…
Generally, halophilic enzymes present a characteristic amino acid composition, showing an increase in the content of acidic residues and a decrease in the content of basic residues, particularly lysines. The latter decrease appears to be responsible for a reduction in the proportion of solvent-exposed hydrophobic surf…
The conjugation of cationic protein transduction domains to proteins results in an increase in the extent to which proteins are internalized by cells. This investigation sought to determine whether the conjugation of a protein transduction domain to a functional protein could be used to facilitate the incorporation of…
Abstract Polymers commonly undergo deformation under an applied stress over their lifetime; some deformations are irrecoverable once the source of stress is removed. Therefore an understanding of the response of a polymer can be achieved by investigating the viscoelastic properties using creep experiments, where the b…
In this paper, adsorption of lysozyme onto two kinds of mesoporous adsorbents (KIT-5 and AISBA-15) has been investigated and the results on the effects of pore geometry and stability of the adsorbents are also discussed. The KIT-5 mesoporous silica materials possess cage-type pore geometry while the AISBA-15 adsorbent…
Plasma-assisted reactive rf magnetron sputtering deposition is used to fabricate vanadium oxide films on glass, silica and silicon substrates. The process conditions are optimized to synthesize phase-pure vanadium pentoxide (V 2 O 5 ) featuring a nanocrystalline structure with the predominant (0 0 1) crystallographic…
Multinuclear solid-state NMR was used to characterize the molecular structures in nylon 6−montmorillonite nanocomposites in comparison with the two pure components. Both the polymer and the clay were studied. 27 Al two-dimensional multiple quantum magic angle spinning (MQMAS) measurements reveal the existence of an ad…
The ability of electric fields to align nonpolar semiconducting molecules was demonstrated using hexa(para-n-dodecylphenyl)hexabenzocoronene (HBC-PhC12) as a model compound. A solution of HBC-PhC12 was applied to a glass surface by drop-casting and the molecules were oriented into highly ordered structures by an elect…
We have pointed out that zinc based particles obtained from ethanolic solution of a zinc acetate derivative (zinc oxy-acetate, Zn 4 O(Ac) 6 ) are a mixture of nanometer sized ZnO, zinc oxy-acetate, and zinc hydroxide double salt (Zn−HDS). The knowledge of the mechanisms involved in the formation of ZnO and Zn−HDS phas…
Water-insoluble chitosan nanofiber sheets and tubes coated with chitosan-cast film were prepared by electrospinning. When as-spun chitosan nanofiber sheets and tubes were immersed in 28% ammonium aqueous solution, they became insoluble in water and showed nanofiber structures confirmed by SEM micrography. Mechanical p…
Abstract A practical ruthenium phase‐transfer catalyst (Ru‐PTC) system for the oxidation of naphthalene derivatives has been developed. Substituted 1,4‐quinones are obtained in good selectivity and yield in water without the addition of any organic solvent and acid. By applying the optimized conditions the feed additi…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Graft Copolymers Containing Biodegradable Poly(3-hydroxybutyrate) ChainsDorota Neugebauer, Joanna Rydz, Izabela Goebel, Piotr Dacko, and Marek KowalczukView Author Information Centre of Polymer Chemistry, Polish Academy of Sciences, 34, Maria Sklodowska-Curie Str.,…
We derive the nonlinear transport equations for isothermal crystalline solids using a density-functional theory based free energy and the Poisson bracket formalism. The model is comprised of three characteristic time scales: A fast one of sound waves and two slow ones of diffusive phenomena. It also combines long-rang…
Mount Etna provided the lava rocks used for the direct synthesis of carbon nanotubes and nanofibers by chemical vapor deposition (see image; scale bar: 15 μm). Since the iron oxide particles abundantly present serve as a natural catalyst, this could be an effective approach for the efficient production of nanocarbons.
Nanotechnologies to allow the nondisruptive introduction of carriers in vivo have wide potential for therapeutic delivery system. We have prepared functional nano-magnetic particles (d = 3 nm) by silanization with (3-aminopropyl) triethoxysilane. For the purpose of functionalizing the surface of the nanoparticles with…
A synthetic procedure for the preparation of nanocomposite films of sago starch and CdS nanoparticles was introduced. The films were characterized using optical, structural, and thermal techniques. The formation of nanostructured CdS in the starch matrix was confirmed by a blue shift in the onset of absorption in the…