Materials Literature
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Attaining control over the surface chemistry of titanium is critical to its use in medical implants, especially to address complications such as infection and loosening of implants over time, which still present significant challenges. The surface-initiated atom transfer radical polymerization (SI-ATRP) of a saccharid…
Abstract A detailed characterization, using high resolution electron microscopy/microanalysis (SEM, TEM, HRTEM, and EDX), reveals tubular carbon nanostructures exhibiting complex and fascinating morphologies. The materials were obtained by sulfur‐assisted chemical vapor deposition. It is demonstrated that S not only a…
This paper reports the design, synthesis and characterization of thin films as a platform for studying the separate influences of physical and chemical cues of a matrix on the adhesion, growth and final phenotype of cells. Independent control of the physical and chemical properties of functionalized, swellable hydroge…
VO, V(2)O(3), VO(2), V(6)O(13), V(4)O(9), V(3)O(7) and V(2)O(5) have been investigated in terms of structure, bulk modulus B and elastic constant C(44) using ab initio calculations. The C(44) values for V(6)O(13), V(4)O(9), V(3)O(7) and V(2)O(5) are significantly lower than those for V(2)O(3) and VO(2). As the V valen…
Room temperature sensing characteristics of the polypyrrole (PPy) films modified with different weight percentages of ZnO nanowires (ZnO-NWs) have been studied for various oxidizing (NO2 and Cl2) as well as reducing (H2S, NH3, CH4, and CO) gases. We demonstrate that ZnO-NW (50 wt %):PPy composite films are highly sele…
Two novel α-Keggin anion-based coordination polymers with argentophilic {Ag 3 } 3+ /{Ag 4 } 4+ clusters, [{Ag 3 (bpy) 4 }{PMo 12 O 40 }]·2H 2 O ( 1 ), [{Ag(bpy)} 2 {Ag 4 (bpy) 6 }{PMo 11 VO 40 }][{Ag(bpy)} 2 {PMo 11 VO 40 }] ( 2 ), have been hydrothemally synthesized and characterized by elemental analysis, IR spectro…
Measurement of the low temperature specific heat of LaCoO3 single crystals reveals a previously unobserved Schottky anomaly with an energy level splitting, 0.5 meV, that is associated with the first excited spin state of the Co3+ ion. These states persist well below 2 K and have a g-factor around 3.5, consistent with…
Abstract Carbon nanotubes (NT) have attracted growing interest in recent years as a conducting filler in the development of conductive polymer composites. However, most of experimental results show that the conductivity of NT/polymer composites is significantly lower than expected. Can NTs be an effective conductive f…
In this letter we report that CdS nanocrystals are reshaped into an elongated rod form for increasing two-photon absorption. CdS quantum rods with uniform rod dimensions have been synthesized and their two-photon absorption cross section in solution has been characterized using the z-scan method and the two-photon ind…
We report the synthesis and characterizations of low Mn-doped (<10−3 molar fraction) 6H-SiC. Raman scattering studies show an unusual shift in Raman peak with altering Mn contents. The magnetic properties measurement shows the typical ferromagnetic order was established at as low Mn-doped concentration as 10−4…
We use ultrafast electron diffraction to study lattice heating of 20nm noble metal films after femtosecond optical excitation with moderate excitation fluences. Using the Debye–Waller effect, the rise times of the lattice temperature were measured to be 1.1ps in copper (5.9mJ∕cm2 incident fluence) and 4.7ps in gold (0…
Low-frequency dielectric polarization of single-walled carbon nanotubes (SWNTs) not only affects charge carrier transport in SWNT-based nanoelectronic devices but also determines their interaction with molecules, other nanomaterials, and external fields. Differential dielectric responses of metallic and semiconducting…
The sensitive response of the dielectric permittivity under the application of magnetic fields in Mn0.60Zn0.40Fe2.12O4+δ polycrystalline ferrite is presented. A magnetic field of 3.5 kOe induced a giant magnetodielectric {MD=[ε′(H)−ε′(0)]/ε′(0)} response, of 1800% at f=7 MHz, at room temperature. The ferrite exhibits…
Based on first-principles calculations, we have investigated the magnetic properties of non-transition-metal doped semiconductors Al(N,X) and Zn(O,X), where X is a first row atom. It is revealed that the dopant can remain magnetic only if it is less electronegative than the substituted host anion atom and the dopant 2…
We have employed the “3ω method” to determine the thermal conductivities of the amorphous and crystalline phases of the technologically important materials Ge2Sb2Te5, nitrogen-doped Ge2Sb2Te5, Ag- and In-doped Sb2Te, and Ge15Sb85. We used the “3ω voltage” as a monitor of thermal conductivity that allowed us to observe…
Composites of natural rubber were prepared with TiO 2 and nanosilica. The stress relaxation behavior of the composites under tension was studied with reference to the filler loading and strain level. It was observed that the rate of stress relaxation increases with increase in filler loading. The rate of stress relaxa…
We systematically investigated the structural and dynamic properties of nanofilled elastomer on the basis of the idealized model of elastomer and nanoparticle. The simulated results indicate that the introduced nanoparticles induce more efficient chain packing. Meanwhile, a mobility gradient of polymer chains is found…
By adopting the coordinate transformation theory and the corresponding numerical approach, we investigated the method of designing open cloaks that have one or more windows to exchange information and matter with the outer environment. Compared with close cloaks, open cloaks have the quasiperfect cloaking performance…
A new dendritic manganese(II) chelate 1 has been evaluated by in vivo (relaxivity) and in vitro (toxicity and relaxivity) experiments as a manganese enhanced magnetic resonance imaging (MEMRI) contrast agent. Also, a comparison with its corresponding gadolinium(III) homologue 2 and the commercially available MEMRI age…
Deliberately oxidized iridium, platinum, and palladium Schottky contacts were fabricated on the Zn-polar and O-polar faces of hydrothermal bulk ZnO by eclipse pulsed laser deposition in an oxygen ambient. The barrier heights of these oxidized contacts were significantly higher than their plain metal counterparts, with…