Materials Literature
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The crystal and magnetic structure of (La 0.50 Ca 0.50 )(Mn 1− x B x )O 3 ( x = 0.00, 0.03, 0.08; B = Cr, Ni) has been investigated between 5 and 300 K by means of dc magnetic measurements and neutron powder diffraction followed by Rietveld refinement. In the pristine compound an orthorhombic to monoclinic phase trans…
The uniaxial natural fabric Hildegardia populifolia was coated with polycarbonate and its tensile strength, modulus and percent elongation at break were determined. The effect of alkali treatment and a coupling agent on the tensile properties of the fabric was also studied. The tensile properties were enhanced by alka…
Abstract This article examines thermoplastic elastomers (TPEs) and thermoplastic vulcanizates (TPVs) as two types of elastomers from melt‐blended and dynamically vulcanized ethylene–propylene–diene monomer (EPDM) rubber materials and nylon 6 plastic materials. A series of investigations were conducted on the mechanica…
Abstract Degumming of hemp fiber by high temperature alkali cooking was investigated, and the effect of temperature and dosage of alkali on the constituents, structure, and thermal degradation of hemp fiber was also discussed in this work. The morphology, structure, and thermal degradation of hemp fiber after high tem…
We have studied the electronic and magnetic properties of epitaxially grown ${\text{CaMn}}_{1\ensuremath{-}x}{\text{Ru}}_{x}{\text{O}}_{3}$ thin films $(x=1.0,0.75,0.5)$ by soft x-ray absorption, soft x-ray magnetic circular dichroism (XMCD), and hard x-ray photoemission spectroscopy (HXPES) measurements. The XMCD stu…
Abstract Thermophysical and thermomechanical properties of UV‐cured Norland Optical Adhesives (NOA65) and low molecular weight Liquid Crystal E7 systems were investigated. Thin films of Polymer Dispersed Liquid Crystal were prepared by Polymerization Induced Phase Separation and UV‐curing. Phase diagrams were establis…
The Al nanowire arrays were directly deposited on the Si substrates by a facile electron-beam evaporation technique, oblique angle deposition. This process was accomplished by tilting the Si substrates and adjusting the incident angle of evaporated Al vapor flux from the normal of the substrates at 87°. X-ray diffract…
We studied the synthesis of siliceous structures by using a nonionic block copolymer (Pluronic P123) and perfluorooctanoic acid (PFOA) as cotemplates in an acid-catalyzed sol-gel process. Different siliceous structures were obtained through systematically varying the molar ratio (R) of PFOA/P123, and the resultant mat…
One of the most cumbersome and time-demanding tasks in completing a protein model is building short missing regions or ;loops'. A method is presented that uses structural and electron-density information to build the most likely conformations of such loops. Using the distribution of angles and dihedral angles in penta…
The present work is devoted to explaining the role of epitaxial strain in the structure and the metal–insulator (MI) transition in SmNiO 3 (SNO) films deposited on LaAlO 3 (LAO) and SrTiO 3 (STO) substrates. X-ray reciprocal space mapping and valence bond calculations allow us to show that in-plane compressive strain…
Abstract We have reported that a star‐like network structure with lignin as center in polyurethane resulted in the simultaneous enhancement in mechanical strength and elongation. In this study, we aimed to enhance the mechanical properties of waterborne polyurethane by adding nitro‐lignin (NL) to form analogical star‐…
Abstract Herein we demonstrate that amorphous oxide semiconductor (AOS) superlattices composed of a‐In–Zn–O (well) and a‐In–Ga–Zn–O (barrier) layers, fabricated on SiO 2 glass substrate by pulsed laser deposition at room temperature, exhibited an enhanced Seebeck coefficient | S |. The | S | value increases drasticall…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
Laboratory spectra of carbon nanoparticles (CNPs) near 3.29 μm show a band whose profile is an excellent match to that of the aromatic CH feature observed in type A emission sources. This band is associated with the CH stretching vibration in polycyclic aromatic hydrocarbon (PAH) molecules having peripheral aliphatic…
Abstract The smectic‐α transition of iPP was studied by wide angle X‐ray diffraction (WAXD) and small angle X‐ray scattering (SAXS). WAXD and SAXS patterns were taken at different temperatures during the transition. Two different approaches were taken in the analysis of SAXS data: the correlation function and a fittin…
Using PAMAM dendrimers as nanoparticle templates, a synthetic route to prepare 3 nm magnetic NiAu nanoparticles was developed. Aqueous solutions of hydroxyl-terminated generation 5 PAMAM dendrimers in 25 mM NaClO 4 were shown to bind aqueous Ni II . Coreduction of Ni II and Au III salts yielded bimetallic dendrimer st…
Abstract In this work, thermoplastic elastomers were prepared based on low‐density polyethylene (LDPE) and ground tire rubber (GTR). To improve the adhesion and achieve better rubber‐like properties, ethylene vinyl acetate copolymer (EVA) was selected and used as a compatibilizer. The GTR and EVA content were varied b…
Abstract A low‐viscosity bisphenol E cyanate ester (BECy) monomer was combined with fumed silica with average primary particle diameters of 12 and 40 nm to form high‐temperature adhesives with processability at ambient temperatures. Rheological evaluation revealed that for silica loadings below 15 vol%, suspensions of…
Biodegradable, negatively charged, branched polyesters, namely, poly(vinyl sulfonate-covinyl alcohol)-graft-poly( d, l -lactic-coglycolic acid), abbreviated as P(VS-VA)-g-PLGA, were synthesized by ring-opening polymerization using sulfonate-modified poly(vinyl alcohol) backbones as a platform for cationic drug deliver…
We present theoretical calculations of phonon dispersion in silicon nanocrystals using an approach based on the adiabatic bond charge model. To deal with the boundary conditions, two cases are considered: the surface atoms are either free to move or rigidly fixed. In the former case, surface modes appear at low freque…