Nanoindentation was performed on layered structure materials to determine values for stiffness and hardness perpendicular to the layers. In order to establish the validity of this technique for anisotropic materials, ...
Nanoindentation was performed on layered structure materials to determine values for stiffness and hardness perpendicular to the layers. In order to establish the validity of this technique for anisotropic materials, layered minerals with known elastic constants were tested, including brucite and muscovite mica. A layered ceramic oxide of interest, KCa2Nb3O10, was also investigated. A Berkovich diamond tip was used to carry out the indentations. Indents were made on atomically flat surfaces of crystals, as observed in-situ with an atomic force microscope. Analysis of load versus displacement data showed that the elastic constant C33 for muscovite and brucite agreed to within five percent of literature values. In the case of KCa2Nb3O10, average values of 57.0 GPa for C33 and 3.8 GPa hardness were obtained.
In this study, we investigated the effects of DNA/Pt-DNA strands as hole collecting layers in polymer heterojunction solar cells based on ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al structure. We demonstrated that by introducing D...
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作者：
Balandin, Alexander A.Nano-Device Laboratory
Department of Electrical Engineering and Materials Science and Engineering Program University of California - Riverside Riverside CA 92521 United States
Superior thermal properties of graphene are described and its prospective applications in thermal management are discussed. Studies have shown that the thermal conductivity of graphene depend on the size of the flakes...
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Superior thermal properties of graphene are described and its prospective applications in thermal management are discussed. Studies have shown that the thermal conductivity of graphene depend on the size of the flakes and edge roughness. To evaluate the possible enhancement with graphene fillers, the effective medium approximation (EMA) approach is used, modifying it to incorporate the thermal boundary resistance (TBR). It is found that the effective thermal conductivity decreases with decreasing diameter of carbon nanotubes (CNT), and that the graphene-based thermal interface materials (TIM) show stronger effective thermal conductivity compared to those with CNTs. An experimental study found a 1000% enhancement for graphene-epoxy composite and 500% enhancement for graphene-silver epoxy composite at 5.0 vol% fraction.
In this paper we show that a flash lamp can be employed to induce controlled lateral solidification of a-Si thin films. Specifically, a dual xenon-arc-lamp-based system was utilized to induce location-controlled compl...
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In this paper we show that a flash lamp can be employed to induce controlled lateral solidification of a-Si thin films. Specifically, a dual xenon-arc-lamp-based system was utilized to induce location-controlled complete melting by shaping the incident beam using a contact mask. The resulting laterally solidified microstructure consisted of exceptionally long grains (~10s to ~100s of μm) that were relatively free of intragrain-defects. With further development and optimization, the approach may lead to cost-effective/high-throughput processes and systems that can capture and enhance the advantages of laser-based/melt-mediated crystallization techniques.
作者：
Seong Yoon LimJunhyoung AhnJoon Seok LeeMin-Gon KimChan Beum ParkDepartment of Materials Science and Engineering
Korea Advanced Institute of Science and Technology (KAIST) 335 Science Road Daejeon 305-701 Korea Biomonitoring Research Center
Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Science Road Daejeon 305-806 Korea Advanced Photonics Research Institute
Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology Gwangju 500-712 Korea Chan Beum Park
Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 335 Science Road Daejeon 305-701 Korea. Min-Gon Kim
Advanced Photonics Research Institute Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology Gwangju 500-712 Korea
Large area graphene film is usually grown on a metal and then transferred to a substrate for its utilization. We report here a rapid (10 seconds) graphene growth method that can be carried out on any desired substrate...
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Large area graphene film is usually grown on a metal and then transferred to a substrate for its utilization. We report here a rapid (10 seconds) graphene growth method that can be carried out on any desired substrate, including insulator, thus negating the need for the transfer. This method is based on metal-induced crystallization of amorphous carbon to graphene, and involves a very thin metal layer that is less than 10 nm thick. Rapid thermal annealing of a bilayer of a-C and metal deposited on a given surface leads to the formation of graphene film, and subsequent breaking-up of the thin metal layer underneath the film, resulting in a graphene-metal hybrid that can be used as a transparent electrode. Post annealing, which causes agglomeration of nano-crystallites, enhances transmittance of the film without affecting sheet resistance. The nature of the growth method allows not only large area formation of graphene film but also film formation only on desired area.
The emergence of Fano resonances in the extinction spectra of arrays of aluminum nanodiscs 30-200 nm in diameter deposited on [Zn, Mg]O quantum wells provide the first evidence of strong coupling in zinc oxide heteros...
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A glaucoma drainage device for the regulation of intraocular pressure is presented. The device consists of three biocompatible polymer layers: the cover (top layer), the diaphragm (intermediate layer), and the basepla...
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ISBN:
(纸本)9789898425379
A glaucoma drainage device for the regulation of intraocular pressure is presented. The device consists of three biocompatible polymer layers: the cover (top layer), the diaphragm (intermediate layer), and the baseplate with a cannular (bottom layer). Finite element analyses (FEA) were performed to find optimal design parameters for the targeted cracking pressure: the diameter of orifice, the thickness of intermediate layer, the width of the channel, and the overlapped length of the orifice over valve seat. Top and bottom layers were made by polydimethylsiloxane (PDMS) replica molding process, and an intermediate thin layer with through-holes was fabricated by PDMS fill-in molding method and hydrophobic treatment. The overlapped area of the bottom layer was coated with Cr and Au by using PDMS as a shadow mask. Metal layers are not to be bonded between the bottom and the intermediate layers so that the device showed the enhanced reliability in operation and the higher yield in production. Oxygen plasma treatment was performed for irreversible bonds between separate three PDMS layers. The experimental cracking pressure of the fabricated valve was 2.50 kPa, which is very close to the target value (2.67 kPa). The experiments showed that the proposed polymer check valve can regulate the pressure of the aqueous humour, fluid in an anterior chamber, within the normal intraocular pressure range (15-20mmHg) with a high repeatability.
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