Materials Literature
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Carbon nano tubes (CNT) attracts attention in the field of optical communication. However, CNT is too long as it is compared with the wavelength of communication wavelength and causes the scattering. So we could make CNT short and fat, and our devise showed saturable absorption.
This study is concerned with tensile and Charpy impact properties of high-strength bainitic steels fabricated by controlled rolling process. Six kinds of steels were fabricated by varying finish rolling temperature, start cooling temperature, and cooling rate, and their microstructures and tensile and Charpy impact pr…
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Time resolved optical properties of CdSe tetrapod nanocrystals where studied. The results show that the decays of photoluminescence (PL) intensities for tetrapods in solution and on insulating silicon substrate can be well fitted by a bi-exponential function. Based on the emission-energy dependence of carrier lifetime…
以钛酸四丁酯为Ti源, 尿素为N源, 直接低温水热合成N掺杂TiO 2 粉末, 并以泡沫镍为载体负载N掺杂TiO 2 粉末. 采用XRD、SEM、TEM、UV-Vis和XPS对N掺杂TiO2粉末进行表征, 并研究了其可见光催化降解甲醛气体的性能. 结果表明N原子成功地掺杂到TiO 2 晶格中, 使其晶格常数a和c变大. N原子替代了晶格中部分O原子和Ti原子, N的化学价态表现为Ti-N-Ti和O-N-O形式, N掺杂TiO 2 可描述成Ti 1- y O 2- x N x + y -TiO 2- x N x 形式, 其吸收边界红移到600nm处. SEM结果表明N掺杂TiO 2 可以均匀弥散地分布于泡沫镍的载体上, 且具有高的可…
The effect of 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (BMITFSI) incorporation on the structure, tensile and electromechanical properties of cellulose was premeditated by scanning electron microscopy, X-ray diffraction, tensile test and bend- ing actuation test. Both cellulose and BMITFSI were f…
Conductivity measurements are presented in two isotropic micellar solutions and in the nematic phase of the sodium salicylate/cetylpyridimium chloride/H2O system under shear. For the isotropic solutions the concentrations studied correspond to the plateau behaviour in the flow curve for this system. The measured aniso…
The charging and discharging dynamics of Ge nanocrystal memories is measured and compared with a realistic quantum mechanical model that is able to reproduce qualitatively the overall device behavior. Quantitatively, the charging (discharging) dynamics is faster (slower) than predicted by calculations. To explain the…
We present theoretical modeling and experimental results of optical gain and lasing from tensile-strained, n[superscript +] Ge-on-Si at room temperature. Compatible with silicon CMOS, these devices are ideal for large-scale electronic-photonic integration on Si.
The refractive indices of (Al 0.48 In 0.52 As) z (Ga 0.47 In 0.53 As) 1-z , and Ga x In 1-x As y P 1-y quaternary materials is presented from a model that takes into account of band-to-band Coulomb interaction and Urbach broadening. We apply an accurate absorption model to calculate the contribution near band-edge reg…
We designed Bragg grating waveguides on a substrate for optical filters. This waveguide consists of non-birefringent cross-section structures applicable to fabrication using photolithography. This method allows polarization-independent optical filters to be realized on a substrate.
We fabricated a compact optical switch of a symmetric Mach-Zehnder interferometer using Si-waveguide with a ferro-electric liquid crystal cladding. We demonstrated a switching operation with the experimental device fabricated at 1550nm wavelength.
A new organic-inorganic hybrid microporous membrane was prepared via Sol-Gel method with bridged silsesquioxane (1, 2-bis(triethoxysilyl)ethane, BTESE) as a precursor. Macroporous α-Al2O3 disk supported mesoporous γ-Al2O3 layer was used as support. Defect-free hybrid silica membrane was deposited on such support by us…
Analytical methods with nanometre-scale resolution are indispensable in various scientific fields, including biology, chemistry and nanotechnology. One suitable tool, the soft x-ray microscope, provides high spatial resolution of unstained specimens. Recently, we developed an x-ray microscope called a scanning electro…
We present a systematic first-principle study of the structures, energetics and electronic structure of (ZnO) n clusters in the size range 1 ≤ n≤ 12. We show that the planar ring structures are stable for n < 8, while spheroidal structures made out of rings of (ZnO) 3 and (ZnO) 2 are stable for n ≥ 8. We examine the b…
Attempts at generating nanograins through uniaxial single compression were made by deforming copper samples at 298 K and 77 K. At 298 K, dynamically-deformed samples (DDS) become softer, in contrast to quasi-statically deformed samples (QDS), which show a hardness close to the saturation value. The microstructure of D…
In the present work, we have experimentally studied and analysed the dilatometric properties of Sn2P2(Se0.28S0.72)6 crystals during ferroelectric phase transition. A complete matrix of thermal expansion tensors as well as the characteristic surface of the thermal expansion tensor has been obtained. The critical expone…
To appreciate the universal qualitative features of defect annihilation in nematic liquid crystals, we study how the viscous force of reorientational dynamics behaves under a transformation that reverses the sign of the defect's topological charge. As an illustration of our general results, we consider a class of poin…
It is known from experiments that smectic C* liquid crystals arranged in a bookshelf geometry between two parallel glass plates can exhibit a pumping phenomenon under the application of an electric field when the lower plate is fixed and the upper plate is allowed the possibility of some movement. This phenomenon, whi…
In paper III of this series we proposed a scenario of superconductivity driven by hole "undressing" that involved a complete redistribution of the occupation of single particle energy levels: the holes near the top of the band were proposed to all condense to the bottom of the band. Here we consider a less drastic red…