Anvar A. Zakhidov

Bio: Anvar A. Zakhidov is an academic researcher from University of Texas at Dallas. The author has contributed to research in topics: Perovskite (structure) & Carbon nanotube. The author has an hindex of 63, co-authored 417 publications receiving 27644 citations. Previous affiliations of Anvar A. Zakhidov include University of Texas System & Business International Corporation.

Nanostructured thermoelectrics based on periodic composites from opals and opal replicas. I. Bi-infiltrated opals

Abstract: We have developed a variety of templating processes for the fabrication of three-dimensionally periodic, nanostructured thermoelectrics from opal and inverse opal matrices. These opals and inverse opals are periodic at optical wavelengths and have extremely high interfacial area. It was hoped that scattering processes at the interface between opal and infiltrated thermoelectric material would increase the thermoelectric figure of merit (ZT) by having a greater effect on phonon-mediated (lattice) thermal conductivity than on electronic conductivity. We provide the first demonstration that this approach can increase ZT by evaluating a simple prototype system: bismuth infiltrated into porous SiO/sub 2/ opal. We find a larger fractional decrease in thermal conductivity than for electrical conductivity (relative to bulk polycrystalline Bi). Since the thermopower is little changed, the overall effect we observe is as much as a two-fold increase of ZT compared with that for polycrystalline bulk bismuth. However, the observed ZT is much smaller than for single crystal bismuth.

All solid state stretchable carbon nanotube based supercapacitors with controllable output voltage

Abstract: This work reports the electrochemical properties of stretchable supercapacitors fabricated with carbon nanotubes (CNTs) sheets as electrodes. According to the SEM images of the electrodes, the CNTs look like interconnected wires oriented in one direction. The electrochemical analysis indicated that the devices subjected from 0 to 150% strain decreased their capacitance from 712.2 to 88.4 F/g. Interestingly, the device stretched 525 times at 50% strain had a capacitance of 1328.3 F/g, which is one of the highest capacitance values reported so far for stretchable supercapacitors. The cycling voltammetry curves of the stretched devices showed redox peaks, suggesting that these devices store charge by Faradaic reactions. The presence of redox centers (carboxylic groups and oxygen vacancies) was confirmed by Fourier transform infrared spectroscopy, optical absorbance measurements, and X-ray photoelectron spectroscopy measurements. The galvanostatic charge/discharge curves showed the presence of two components: capacitive (discharge with exponential decay) and battery-type (stable output voltage). This output voltage was controlled with the strain %, since values of 1.05 V, 0.72 V, and 0.32 V were obtained for 0, 50, and 100% strain, respectively. The high capacitance and stable voltage demonstrated by the devices suggest that they could be used as energy sources in wearable/portable applications.

Superconducting properties of FeSexTe1−x thin film with a composition close to antiferromagnetic ordering

Abstract: In this study Te-rich iron chalcogenide (FeSexTe1−x) thin films with a composition close to antiferromagnetic ordering have been deposited on SrTiO3 (STO) substrates The superconducting critical transition temperature (Tc) of the FeSe01Te09 thin film on STO substrate ranges from ∼125 to ∼133 K The upper critical field is as high as 114 T, which is much higher than that of the FeSe05Te05 thin film on STO substrate (∼49 T) The self-field critical current density () at 2 K of 18 × 105 A cm−2 is much higher than that of the FeSe05Te05 thin film, and the FeSe01Te09 thin film also demonstrates superior pinning properties under applied magnetic field Compared to FeSe05Te05, which was considered as the optimum composition, FeSe01Te09 presents even more promise for high field applications because of its high upper critical field and high critical current density

Electric Field Effect in Atomically Thin Carbon Films

Abstract: We describe monocrystalline graphitic films, which are a few atoms thick but are nonetheless stable under ambient conditions, metallic, and of remarkably high quality. The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands, and they exhibit a strong ambipolar electric field effect such that electrons and holes in concentrations up to 10 13 per square centimeter and with room-temperature mobilities of ∼10,000 square centimeters per volt-second can be induced by applying gate voltage.

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

Carbon Nanotubes--the Route Toward Applications

Abstract: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects. Some of these applications are now realized in products. Others are demonstrated in early to advanced devices, and one, hydrogen storage, is clouded by controversy. Nanotube cost, polydispersity in nanotube type, and limitations in processing and assembly methods are important barriers for some applications of single-walled nanotubes.