Materials Literature
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We have measured the sub-THz electrical response of screen printed carbon nanotube-poly(methyl methacrylate) polymer composites up to 220 GHz. The measured electrical losses using mm long coplanar waveguide geometries averaged as low as 0.15 dB/mm in the frequency range 40 GHz–110 GHz and showed a reduction in signal…
Abstract Multiarm star copolymers consisting of the polyether‐polyol hyperbranched poly(ethylene glycol) ( hb PEG) as core and poly( L ‐lactide) (PLLA) arms are synthesized via the organobase‐ catalyzed ring‐opening polymerization of lactide using hb PEG as a multifunctional macroinitiator. Star copolymers with high m…
The phase behavior of grafted d-polystyrene- block -poly(methyl methacrylate) diblock copolymer films is examined, with particular focus on the effect of solvent and annealing time. It was observed that the films undergo a two-step transformation from an initially disordered state, through an ordered metastable state,…
The Thermodynamics of Defect Formation in Self-Assembled Systems 281 where τ o represents the average time between collisions or vibrations or similar events that may lead to dissociation of the aggregate.This is an important equation because it suggests that although these self-assembled arrangements may be experimen…
Pounding between adjacent components and structures has become an important cause of structural damage or even collapse under large excitations such as earthquakes and ship collisions. Shock absorber devices (SAD) are often used to connect the separation gap to reduce the pounding force. However, some shock absorber d…
The shape that a liquid drop will assume when resting statically on a solid surface inclined to the horizontal is studied here in two dimensions. Earlier experimental and numerical studies yield multiple solutions primarily because of inherent differences in surface characteristics. On a solid surface capable of susta…
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The hydrogen release and uptake kinetics of sodium alanate, NaAlH 4, are greatly improved after doping with small amounts of transition metals, such as Ti. However, after 15 years of active research, an atomic-level understanding of the effect of Ti on the reaction rate is still lacking. One theory suggests that Ti at…
We propose a physical concept of non-reciprocal transformation optics, by which a one-way invisible cloak is designed. The one-way invisible cloak is made of a coordinate-transformed nonreciprocal photonic crystal, showing a perfect cloaking for wave incident from one direction but acting as a perfect reflector for wa…
Selective reduction of 2-nitro-3-methoxybenzaldehyde provides 2-amino-3-methoxybenzaldehyde that undergoes the Friedländer condensation with a variety of acetyl-substituted derivatives of pyridine and 1,10-phenanthroline. After cleavage of the methyl ether, the resulting polydentate analogues of 8-hydroxyquinoline are…
TiO2/CdS core-shell nanowires were synthesized using a simple thermal oxidation treatment of a Ti film, followed by O2 plasma treatment and CdS coating via low-cost chemical bath deposition. The 5 and 20 nm thick CdS films were uniformly coated onto TiO2 nanowires using 200 and 40 ml aqueous solvent, respectively. Tim…
We experimentally and theoretically investigate the nonlinear electromagnetic properties of an on-chip metamaterial system comprised of two coupled ring resonators (CRRs) as meta-dimer and a varactor loaded in between them as nonlinear medium inclusion. The resonant frequency of the anti-symmetric coupling mode of CRR…
Abstract Poly(3,4‐ethylenedioxythiophene) (PEDOT) doped with a series of anionic polysaccharides such as carboxymethyl cellulose, sodium hyaluronate, xanthan gum, pectin, gellan gum were prepared by electropolymerization in aqueous solutions. Some other dopants of potassium nitrate, potassium sulfate, sodium poly(styr…
1, 3, and 5 wt.% silver-doped ZnO (SZO) nanowires (NWs) are grown by hot-walled pulsed laser deposition. After silver-doping process, SZO NWs show some change behaviors, including structural, electrical, and optical properties. In case of structural property, the primary growth plane of SZO NWs is switched from (002)…
Polyvinyl alcohol polymer films doped with Sm,Tb(Sal) 3 Phen complexes have been synthesized using solution casting technique. An enhancement in absorption intensity is observed revealing the encapsulation of rare earth ions by salicylic acid (Sal)/1,10 phenanthroline (Phen) complex. Photoluminescence spectra of the c…
Single crystal synchrotron X-ray diffraction measurements have been carried out on [Nd(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O (DMF = dimethyl-formamide), 1; [Y(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 2; [Ce(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 3; [Sm(DMF)(4)(H(2)O)(3)(μ-CN)Fe(CN)(5)]·H(2)O, 4; [Tb(DMF)(4)(H(2)O)…
We have observed a persistent x-ray induced insulator-metal transition at low temperature for an epitaxial film of electron-doped VO${}_{2}$, a material as characterized by strong electron-electron and electron-lattice interactions. The volume fraction of the photo-generated metallic patches, ranging from 0 to 100% of…
The dynamics of a single tripeptide Arg-Gly-Asp (RGD) adsorbing onto negatively charged hydroxylated rutile (110) surface in aqueous solution was studied using molecular dynamics (MD) simulations. The results indicate that the adsorbed Na + ions play an important role in determining the binding geometry of RGD. With a…
We investigate the spin dynamics of a nitrogen-vacancy (NV) center contained in an individual diamond nanocrystal in the presence of continuous microwave excitation. Upon periodic reversal of the microwave phase, we observe a train of ``Solomon echoes'' that effectively extends the system coherence lifetime to reach s…
We demonstrate that homogeneous single-layer graphene can be grown by simply annealing crystalline Cu(111)/c-plane sapphire (α-Al2O3) at 900 and 1000 °C without additional carbon supply. The resulting graphene film shows a high carrier mobility of 1210 cm2 V−1 s−1. However, the annealing at a lower temperature of 800…