Materials Literature
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In this study, the rotational dynamics of hydration water confined in calcium-silicate-hydrate (C-S-H) gel with a water content of 22 wt.% was studied by broadband dielectric spectroscopy in broad temperature (110-300 K) and frequency (10(-1)-10(8) Hz) ranges. The C-S-H gel was used as a 3D confining system for invest…
We report on the changes in structural, morphological, and optical properties of sol-gel derived ZnO and ZnO:Fe nanoparticles due to dense electronic excitations produced by heavy ion irradiations using 200 MeV Ag+15 ion beams. X-ray diffraction studies with Rietveld refinement show that the samples are single phase a…
Phase field simulations are conducted to investigate the micro-structural signature and the macro-response of a ferroelectric single crystal with domain pinning and depinning phenomena by dislocation arrays. It is shown that due to the presence of the dislocation arrays, a domain with polarizations antiparallel to an…
A new manganese–vanadate hybrid structure, Mn(H 2 O)(bpy)V 2 O 6 ( I; bpy = 2,2′-bipyridine), has been synthesized via hydrothermal methods and characterized by single crystal X-ray diffraction [ P 2 1 / n, Z = 4, a = 6.8557(4) Å, b = 10.4900(6) Å, c = 19.7921(13) Å, β = 96.419(4)°], infrared spectroscopy, thermogravi…
The shape memory alloy (SMA)-actuated separation devices that are currently used in small satellites were usually designed to handle large separation loads. As a result, they have complex structures, large footprints, and high power consumptions. In this paper, we report a simpler and more compact separation device. A…
A general theory of reciprocal unidirectional transmission with tunable sign-switchable refraction and deflection of outgoing wave in structures with broken spatial inversion symmetry is presented. Several coupling scenarios connected with the diffraction-inspired asymmetry in transmission are considered for volumetri…
The synthesis of the peptide stem of bacterial peptidoglycan involves four enzymes, the Mur ligases (MurC, D, E and F). Among them, MurD is responsible for the ATP-dependent addition of d-glutamic acid to UDP-MurNAc-l-Ala, a reaction which involves acyl-phosphate and tetrahedral intermediates. Like most enzymes of pep…
The microscopic origin of the grain size effects on the dielectric, piezoelectric, and thermal depoling properties of Aurivillius phase Bi3.15Nd0.85Ti3O12 was investigated. Using atomic force microscopy, domain walls were observed in micrometer grain size ceramics, but gradually disappeared with reducing grain size an…
Composites of butyl rubber with micron alumina ( BRAL ) and nanoalumina ( BR n AL ) have been prepared by sigma mixing. The stress‐strain curves of both BRAL and BR n AL composites show the mechanical flexibility of the composites. The dielectric and thermal properties of both composites were studied as a function of…
The removal of heteroaromatic nitrogen and sulfur impurities from a model oil through extraction with ionic liquids (ILs) containing metal salts was performed in view of the purification of fuel feeds. Chloride and bis(trifluoromethanesulfonyl)imide salts of Cu+, Cu2+ and Fe3+ were used. The systems based on ILs and m…
Broadband dielectric spectroscopy (10(3) Hz-1.8 × 10(9) Hz) has been performed on the odd nonsymmetric liquid crystal dimers of the series α-(4-cyanobiphenyl-4'-oxy)-ω-(1-pyreniminebenzylidene-4'-oxy) alkanes (CBOnO.Py) with n ranging from 3 to 11, as a function of temperature. A previous thermal behavior study throug…
Due to high specific strength, fatigue resistance, and stiffness, reinforced plastic composites have great deal of relevance in aerospace applications such as electromagnetic interference shielding, radar absorption, etc. These radar absorption structures offer good mechanical properties, absorption characteristics, a…
The generation of a fully valley-polarized current (FVPC) in bulk graphene is a fundamental goal in valleytronics. To this end, we investigate valley-dependent transport through a strained graphene modulated by a finite magnetic superlattice. It is found that this device allows a coexistence of insulating transmission…
Electron emission spectra and total electron yields were measured for relatively large (about 5000 atoms) neon clusters that were irradiated by extreme ultraviolet pulses with 20.3 eV, corresponding to the $2p\ensuremath{\rightarrow}3d$ transition. The present electron emission spectra are remarkably different from th…
Ab initio molecular dynamics simulations have been carried out to study low energy recoil events in SrTiO3. The threshold displacement energies are shown to be strongly dependent on both the orientation and the corresponding atomic arrangement. The minimum threshold displacement energies are 13 eV for an O recoil alon…
Co-doping of sol-gel processed SiO2 thin films with Er3+ ions and In2O3 nanocrystals produced a 100-fold enhancement of Er3+-related 1.54 μm emission compared to films doped only with Er3+. Quantitative studies of temperature-dependent photoluminescence spectra show that this dopant-concentration-dependent luminescenc…
We report chemical vapor-deposited (CVD) graphene field-effect transistors (GFETs) on conventional SiO2/Si substrate with high-performance comparable to GFETs on boron nitride under practical ambient conditions. The fabricated GFET statistics reveal maximum carrier mobility of ∼17 800 cm2/V-s. Intrinsic graphene featu…
Nanotwinned metals received significant interest lately as twin boundaries may enable simultaneous enhancement of strength, ductility, thermal stability, and radiation tolerance. However, nanotwins have been the privilege of metals with low-to-intermediate stacking fault energy (SFE). Recent scattered studies show tha…
On the basis of the concept that the design of a mixed valence system is a key route to create electronic conducting frameworks, we propose a unique idea to rationally produce mixed valency in an ionic donor/acceptor chain (i.e., D(+)A(-) chain). The doping of a redox-inert (insulator) dopant (P) into a D(+)A(-) chain…
Nanoparticles of multiferroic YCrO3 synthesized using the droplet confinement of miniemulsions show unusual features in the magnetic properties at low temperatures, which have not been reported before. Below 10 K, there is a sudden increase in the magnetization, and the nature of M–H hysteresis loops changes appreciab…