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作者： Im, Seongmin Mun, Byungphil An, Jaeyong Choi, Jongchan Yang, Sung Lee, Jonghyun School of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju Korea Republic of

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.

关键词： Polydimethylsiloxane

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Broadband antireflective glasses with subwavelength structures using randomly distributed Ag nanoparticles

Broadband antireflective glasses with subwavelength structur...

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作者： Park, Gyeong Cheol Song, Young Min Ha, Jong-Hoon Lee, Yong Tak Department of Information and Communications Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Department OfNanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of

We demonstrate broadband antireflective glasses with subwavelength structures (SWSs) using randomly distributed Ag nanoparticles. Ag nanoparticles formed by a thermal dewetting process were used as an etch mask for dry etching to fabricate antireflective SWSs on the glass surface. The size and shape of Ag nanoparticles are changed by the different thickness of the Ag thin film. The morphology of SWSs fabricated by using the Ag thin films is well consistent with that of the Ag nanoparticles. The single-side SWS integrated glass exhibits improved transmittance of ∼96% at 750 nm due to the graded refractive index profiles, while the transmittance is only ∼92.5% for the flat surface. To reduce Fresnel reflection at the other side of the glass substrate, the SWSs with optimized Ag film thickness and dry etching conditions are formed on both sides of the glass. The dual-side SWS integrated glass show an average transmittance of ∼97.5% in a wavelength range of 350-750 nm. Transmission band shrinkage effects of the SWS integrated glass are also observed with increased average size of the Ag nanoparticles. Copyright © 2011 American Scientific Publishers All rights reserved.

关键词： Metal nanoparticles

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Biosensors: Graphene-Oxide-Based Immunosensing through Fluorescence Quenching by Peroxidase-Catalyzed Polymerization (Small 13/2012)

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Small 2012年第13期8卷

作者： Seong Yoon Lim Junhyoung Ahn Joon Seok Lee Min-Gon Kim Chan Beum Park Department 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

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Piezoelectric materials: All‐Solution‐Processed Flexible Thin Film Piezoelectric Nanogenerator (Adv. Mater. 45/2012)

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Advanced materials 2012年第45期24卷

作者： Sung Yun Chung Sunyoung Kim Ju‐Hyuck Lee Kyongjun Kim Sang‐Woo Kim Chong‐Yun Kang Seok‐Jin Yoon Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 151‐744 Republic of Korea SKKU Advanced Institute of Nanotechnology School of Advanced Materials Science and Engineering Sungkyunkwan University (SKKU) Suwon 440‐746 Republic of Korea Electronic Materials Center Korea Institute of Science and Technology Seoul 136‐791 Republic of Korea Advanced Institutes of Convergence Technology 864‐1 Iui‐dong Yeongtong‐gu Suwon‐si Gyeonggi‐do 443‐270 Republic of Korea

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Amorphous silicon Bragg reflectors fabricated by oblique angle deposition

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MRS Online Proceedings Library 2011年第1期1396卷 222-227页

作者： S. J. Jang C. I. Yeo Y. T. Lee School of Information & Mechatronics Gwangju Institute of Science & Technology Gwangju Korea Graduate Program of Photonic and Applied Physics Gwangju Institute of Science & Technology Gwangju Korea Department of Nanobio Materials & Electronics Gwangju Institute of Science & Technology Gwangju Korea

We demonstrate the highly reflective broadband a-Si distributed Bragg reflector fabricated by oblique angle deposition. By tuning the refractive index of a-Si film, the high index contrast material system was achieved. The broadband reflective characteristics of a-Si distributed Bragg reflector were investigated by calculation and fabrication. The broad stop band (Δλ/λ=33.7%, R>99%) with only a five-pair a-Si distributed Bragg reflector was achieved experimentally at center wavelength of 650, 980, and 1550 nm. The size-, feature- and substrate-independent method for highly reflective Bragg reflectors was realized by simple oblique angle evaporation.

关键词： optical properties thin film Si

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Optimization of high-reflective broadband subwavelength structure (SWSs) on distributed Bragg reflector

Optimization of high-reflective broadband subwavelength stru...

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16th Opto-Electronics and Communications Conference, OECC 2011

作者： Na, Byung Hoon Song, Young Min Ju, Gun Wu Lee, Yong Tak Department of Information and Communication Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Department of Nanobio Electronics and Materials Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of

Subwavelength structures (SWSs) on distributed Bragg reflector(DBR) is investigated to achieve broadband and high reflection. By proper optimization of each parameter, very high reflectivity can be obtained in broad s... 详细信息

ISBN: (纸本)9781612842882

关键词： Reflection

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Enhancement of Interface Properties between Passivation Layers and InSb by Using Remote PECVD

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AIP Conference Proceedings 2011年第1期1399卷 105-106页

作者： Jaeyel Lee Jong‐Seok Woo Sehun Park Jungsub Kim Changjae Yang Sujin Kim Chulkyun Seok Kang Il Lee Jinsub Park Min‐Koo Han Kwang‐Seok Seo Euijoon Yoon aDepartment of Materials Science and Engineering Seoul National University Seoul Korea dDepartment of Electrical Engineering Seoul National University Seoul Korea bHybrid Materials Program (WCU) Department of Materials Science and Engineering Seoul National University Seoul Korea cDepartment of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon Korea

We report the enhanced interface properties between passivation layers and InSb by using remote PECVD system. SiO2 and Si3N4 layers deposited by remote PECVD showed lower interface trap densities than layers deposited by normal PECVD. SiO2 layers deposited by remote PECVD showed 7.1×1011 cm−2 eV−1 of interface trap density at midgap which is slightly lower than SiO2 layers deposited by PECVD. Si3N4 layers deposited by remote PECVD showed 1.6∼1.7×1012 cm−2 eV−1 at midgap which is 3 times lower than Si3N4 layers deposited by PECVD. Interface properties of SiO2 are superior to that of Si3N4 in both case of PECVD and remote PECVD. To investigate the interface properties between SiO2 and InSb, X‐ray photoelectron spectroscopy was conducted. Indium and antimony oxide phases were found at the interface and these oxide phases could act as the origin of interface traps.

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Model for biological communication in a nanofabricated cell-mimic driven by stochastic resonance

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Nano Communication Networks 2011年第1期2卷 39-49页

作者： Karig, David K. Siuti, Piro Dar, Roy D. Retterer, Scott T. Doktycz, Mitchel J. Simpson, Michael L. Center for Nanophase Materials Sciences Oak Ridge National Laboratory Bethel Valley Road Oak Ridge TN 37831 United States Biosciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 United States Graduate Program in Genome Science and Technology University of Tennessee Knoxville TN 37996 United States Department of Physics and Astronomy University of Tennessee Knoxville TN 37996-2010 United States Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996-2010 United States Center for Environmental Biotechnology University of Tennessee Knoxville TN 37996-2010 United States

Cells offer natural examples of highly efficient networks of nanomachines. Accordingly, both intracellular and intercellular communication mechanisms in nature are looked to as a source of inspiration and instruction for engineered nanocommunication. Harnessing biological functionality in this manner requires an interdisciplinary approach that integrates systems biology, synthetic biology, and nanofabrication. Here, we present a model system that exemplifies the synergism between these realms of research. We propose a synthetic gene network for operation in a nanofabricated cell mimic array that propagates a biomolecular signal over long distances using the phenomenon of stochastic resonance. Our system consists of a bacterial quorum sensing signal molecule, a bistable genetic switch triggered by this signal, and an array of nanofabricated cell mimic wells that contain the genetic system. An optimal level of noise in the system helps to propagate a time-varying AHL signal over long distances through the array of mimics. This noise level is determined both by the system volume and by the parameters of the genetic network. Our proposed genetically driven stochastic resonance system serves as a testbed for exploring the potential harnessing of gene expression noise to aid in the transmission of a time-varying molecular signal. © 2011.

关键词： Gene expression

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Primary study of synthesis and dispersion of zirconia and silica nanoparticles for post-endodontic composite 3

Primary study of synthesis and dispersion of zirconia and si...

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3rd International Conference and Exhibition on Powder technology 2021, ICePTi 2021

作者： Widodo, Puji Mulyawan, Wawan Djustiana, Nina Dentistry Department Post Graduate School Universitas Padjadjaran Man Sekeloa Selatan I Bandung40132 Indonesia Department of Community Medicine Faculty of Medicine Universitas Indonesia Jalan Pegangsaan Timur No. 16 Jakarta10310 Indonesia Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jalan Raya Bandung-Sumedang KM 21 Jatinangor Sumedang45363 Indonesia

Zirconia and silica-based composite are introduced as an alternative to post-core systems due to their high elastic modulus. The cast metal post-core systems in the application of dental material can cause stress concentration within the surrounding radicular dentin, resulting in root fractures. These materials provide more esthetical appealing and biocompatible restorations. However, the use of zirconia and silica nanoparticles as fillers tends to agglomerate in an organic solvent. The objective of the present report is to synthesize zirconia and silica nanoparticles by sol-gel method and subsequently, disperse them in an organic solvent by beads milling methods. The particle size distribution and stability were observed correspondingly using the particles size analyzer (PSA) and zeta potential. The initial average sizes of silica and zirconia particles in organic media were correspondingly 2.7 mm and 191 nm, respectively. After beads milling for 5 hours, silica and zirconia nanoparticles successfully were dispersed with average particles size of 91.5 nm and 124 nm, respectively. The zeta potentials of silica and zirconia suspensions were -21.1 and -10.6 mV, respectively. The SEM image for both particles showed spherical morphology with agglomerated particles having primary particle sizes below 100 nm. Therefore, it was concluded that both particles can be applied as filler for a post-endodontic composite with an additional surfactant before polymerization. © 2011 Institute of Physics Publishing. All rights reserved.

关键词： Silica nanoparticles

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Dynamics and stability of divacancy defects in graphene

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Physical Review B 2011年第7期84卷 075445-075445页

作者： Youngkuk Kim Jisoon Ihm Euijoon Yoon Gun-Do Lee Department of Physics and Astronomy Seoul National University Seoul 151-747 Republic of Korea Department of Materials Science and Engineering Seoul National University Seoul 151-742 Republic of Korea Department of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon 433-270 Republic of Korea Department of Materials Science and Engineering WCU Hybrid Materials Program Seoul National University Seoul 151-742 Republic of Korea Energy Semiconductor Research Center Advanced Institutes of Convergence Technology Seoul National University Suwon 443-270 Korea

A divacancy (DV) is one of the most abundant and most important defects in irradiated graphene, which modifies electronic and chemical properties of graphene. In this paper, we present ab initio calculations to study the dynamics and stability of DVs in graphene. Divacancies in graphene have various reconstructed structures, such as triple pentagon-triple heptagon (555-777) and pentagon-octagon-pentagon (5-8-5) patterns. A direct observation of the structural transformations between these reconstructions was recorded in transmission electron microscope images reported by Girit et al. in science 323, 1705 (2009). We clarify the atomic structures of DVs observed in the experiment and investigate the atomic processes and energetics for the observed dynamical motions in great detail. It is found that a series of Stone–Wales-type transformations are responsible for the migration and structural transformations of DVs and that a pentagon-heptagon-heptagon-pentagon (5-7-7-5) defect appearing as an intermediate structure during the dynamical process plays an important role in the transformations of DVs.

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