Materials Literature
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The vibrational properties of silicon carbide nanoparticles (np-SiC) were investigated as function of the nanocrystal size (5–25 nm) and the features of their outermost surfaces. Raman experiments and numerical methods were conjugated to characterize the signatures from the active SiC normal modes and the vibrational…
Ferroelectric relaxor 0.91PbMg 1/3 Nb 2/3 O 3 –0.09PbTiO 3 single crystals in a wide temperature range were studied using dielectric, x-ray powder diffraction and Raman scattering techniques. Dielectric studies show that without applying an external electric field, 0.91PMN–0.09PT exhibits typical relaxor behaviour wit…
A series of donor-pi-donor derivatives containing phenyl, naphthyl, and anthryl groups as the pi-center and heterocyclic rings as the conjugation bridge have been synthesized and their one- and two-photon spectroscopic properties and photostability were determined. These compounds show bathochromic shifts in the absor…
The time-dependent chemisorption of 2-chlorophenol on a fumed silica surface was studied in situ from 200 to 500 degrees C using a temperature-controlled dosing cell and FTIR absorption spectroscopy. 2-Chlorophenol was found to chemisorb at isolated and geminal surface hydroxyl sites. 2-Chlorophenol chemisorption and…
Abstract Inorganic–organic hybrids mediated by hydrogen‐bonding interactions involving silicon oxide network and poly(ε‐caprolactone) (PCL) were prepared via an in situ sol–gel process of tetraethoxysilane in the presence of PCL. Fourier transform infrared spectroscopy indicated that there were hydrogen‐bonding intera…
A new technique employed to study the photophysical properties of the zinc(II) tetraphenylporphine cation radical is reported. It employs a combination of controlled potential coulometry and femtosecond absorption spectrometry. The fast transient lifetime of 17 ps of the pi-cation species originates in very efficient…
We report on carrier type in phosphorus-doped (Zn,Mg)O films grown by pulsed-laser deposition under a broad range of conditions. For film growth at 500°C, increasing the oxygen partial pressure from 20to200mTorr yielded a carrier type conversion from n to p type. Transport characteristics of as-grown P-doped (Zn,Mg)O…
Ternary ZnCdO single-crystal nanorods with a high Cd incorporation of about 16 at% were synthesized onto Au-catalyzed Si substrate using a physical vapour deposition method. Field emission scanning electron microscopy observation, x-ray diffraction analysis and Raman spectrum showed that the ZnCdO nanorods were well-a…
5-(3-(N-tert-Butyl-N-aminoxyl)phenyl)pyrimidine (RL = 3NITPhPyrim) forms isostructural cyclic M2(RL)2 cyclic dimers with M(hfac)2 (M = Mn, Co, Cu; hfac = hexafluoroacetylacetonate). Mn2(hfac)4(RL)2 exhibits strong antiferromagnetic Mn-RL exchange, with weak ferromagnetic exchange (0.7 cm(-1)) between Mn-RL units that…
The dispersion characteristics of magnetoinductive (MI) waves for a one-dimensional array of metamaterial elements are investigated for the case where the element properties vary in a bi-periodic manner. It is shown that, by this means (analogously to acoustic waves in a solid), a variety of dispersion curves can be o…
Mono-, di-, and trinuclear copper-azido moieties have been synthesized by varying the size of the countercations. [Bu4N]+ yielded a [Cu2(N3)6]2- copper-azido moiety in [Bu4N]2[Cu2(mu(1,1)-N3)2(N3)4], 1, and [Pr4N]+ yielded a [Cu3(N3)8]2- moiety in {[Pr4N]2[Cu3(mu(1,1)-N3)4(N3)4]}n, 2, in which symmetry-related [Cu3(N3…
Adsorption with regeneration is a desirable means to control the emissions of organic vapors such as hazardous air pollutants (HAPs) and volatile organic compounds (VOCs) from air streams as it allows for capture, recovery, and reuse of those VOCs/HAPS. Integration of activated-carbon fiber-cloth (ACFC) adsorbent with…
We have investigated the microstructural changes in ductile porous metals during high pressure-high strain rate loading employing atomistic simulations and explored their relation to recent experiments on polycrystalline copper samples. Molecular-dynamics simulations of shocks in porous, single-crystal samples show th…
The mechanical properties of blends of triblock and diblock copolymers of polystyrene (PS) and polyisoprene (PI) containing 15 wt % PS have been investigated with tensile tests, relaxation tests, dynamic mechanical tests, and hysteresis tests. The properties of binary triblock/diblock blends have been investigated in…
Highly uniform, single-crystalline PbTe nanorods with a diameter of 7 nm and an aspect ratio of 7 can be obtained by using a sonoelectrochemical method. The metal ion/ligand ratio controls the purity of the PbTe nanostructures through the redox chemistry of the ions involved in the growth process. Transmission electro…
Gold (Au) and quantum dot (QD) nanoparticles, which have been extensively used in many fields, were encapsulated with a natural polymer, chitosan, to improve their biocompatibility. Characterization was performed using ultraviolet-visible, dynamic light scattering, atomic force microscopy, and transmission electron mi…
Abstract Hollow latex cages (HLCs) are used as templates to fabricate composite hollow spheres with complex structures. The template HLCs have a polystyrene shell with transverse hydrophilic channels connecting to an interior hydrophilic surface. They are stable and permeable, and a reagent can be preloaded into the c…
The crystal structure of the solid solutions La 2 Mo 2 - y Cr y O 9 ( y ≤ 0.5) and La 2 Mo 2 - y W y O 9 ( y ≤ 1.4) has been studied using X-ray and neutron powder diffraction. These two series of lanthanum molybdates, which belong to the LAMOX family of fast oxide-ion conductors, exhibit a different structural behavi…
We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in…
Foreword. Preface. List of Contributors. 1 Supercritical Carbon Dioxide for Sustainable Polymer Processes (Maartje Kemmere). 1.1 Introduction. 1.2 Strategic Organic Solvent Replacement. 1.3 Physical and Chemical Properties of Supercritical CO2. 1.4 Interactions of Carbon Dioxide with Polymers and Monomers. 1.5 Conclud…