检索结果-内蒙古大学图书馆

Multifunctional metaoptics based on bilayer metasurfaces

Light(science & Applications) 2019年第1期8卷 466-474页

作者： You Zhou Ivan I.Kravchenko Hao Wang Hanyu Zheng Gong Gu Jason Valentine Interdisciplinary Materials Science Program Vanderbilt UniversityNashvilleTN 37212USA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Min H.Kao Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996USA Department of Electric Engineering and Computer Science Vanderbilt UniversityNashvilleTN 37212USA Department of Mechanical Engineering Vanderbilt UniversityNashvilleTN 37212USA

Optical metasurfaces have become versatile platforms for manipulating the phase,amplitude,and polarization of light.A platform for achieving independent control over each of these properties,however,remains elusive due to the limited engineering space available when using a single-layer *** instance,multiwavelength metasurfaces suffer from performance limitations due to space filling constraints,while control over phase and amplitude can be achieved,but only for a single ***,we explore bilayer dielectric metasurfaces to expand the design space for *** ability to independently control the geometry and function of each layer enables the development of multifunctional metaoptics in which two or more optical properties are independently *** a proof of concept,we demonstrate multiwavelength holograms,multiwavelength waveplates,and polarization-insensitive 3D holograms based on phase and amplitude *** proposed architecture opens a new avenue for designing complex flat optics with a wide variety of functionalities.

关键词： surface. optics independently

来源：评论

学校读者我要写书评

暂无评论

Thermoelectrics 1

引用

丛书名： SpringerBriefs in materials

1000年

作者： N. M. Ravindra Bhakti Jariwala Asahel Bañobre Aniket Maske

ISBN: (数字)9783319963419

ISBN: (纸本)9783319963396

The world is facing major challenges for finding alternate energy sources that can satisfy the increasing demand for energy consumption while preserving the environment. The field of thermoelectrics has long been recognized as a potential and ideal source of clean energy. However, the relatively low conversion efficiency of thermoelectric devices has prevented their utility on a large scale.;While addressing the need for thermal management in materials, device components, and systems,thermoelectrics provides a fundamental solution to waste heat recovery and temperature control.;This book summarizes the global efforts that have been made to enhance the figure of merit of various thermoelectric materials by choosing appropriate processes and their influence on properties and performance. Because of these advances, today, thermoelectric devices are found in mainstream applications such as automobiles and power generators, as opposed to just a few years ago when they could only be used in niche applications such as in aeronautics, infrared imaging, and space. However, the continued gap between fundamental theoretical results and actual experimental data of figure of merit and performance continues to challenge the commercial applications of thermoelectrics. This book presents both recent achievements and continuing challenges, and represents essential reading for researchers working in this area in universities, industry, and national labs.

关键词： Energy Harvesting Engineering Thermodynamics, Heat and Mass Transfer Nanotechnology Renewable and Green Energy Optical and Electronic materials

来源：评论

学校读者我要写书评

暂无评论

Photonic Crystals with Split Ring Unit Cells for Subwavelength Light Confinement

Photonic Crystals with Split Ring Unit Cells for Subwaveleng...

引用

CLEO: science and Innovations, S and I 2022

作者： Arnold, Kellen P. Halimi, Sami I. Allen, Joshua A. Hu, Shuren Weiss, Sharon M. Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States

We report a split ring photonic crystal that demonstrates an order of magnitude larger peak energy density compared to traditional photonic crystals. The split ring offers highly focused optical energy in an accessibl...

ISBN: (纸本)9781557528209

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of nitrogen concentration on nanodiamond film characteristics for electrode application

Effect of nitrogen concentration on nanodiamond film charact...

引用

作者： Raina, Supil LeQuan, X.C. Kang, W.P. Davidson, J.L. Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States

ISBN: (纸本)9781607681137

Microwave plasma chemical vapor deposition was used to fabricate nanodiamond films. Nitrogen incorporation was achieved by the introduction of N2 gas along with H2 and CH4 gases in the plasma. SEM studies revealed a change in the microstructure with increase in the N2 flow rate, transitioning from a 'ridge'-like surface morphology to a more 'cauliflower'-like structure. X-ray photoelectron spectroscopy (XPS) analysis showed a general decrease in the sp3 hybridized carbon content while the sp hybridized carbon content increased with N2 flow rate (up to 28.7%) after which it declines. Deconvolution of the C1s XPS spectra indicates incorporation of nitrogen and existence of carbon-nitrogen bonding. Raman spectroscopy shows diamond peak at 1332 cm-1 and the graphite peak, which increases in intensity and shifts towards lower wave number with increase in the N2 flow rate. A diffuse band at 1140 cm -1 indicates presence of a nanocrystalline phase in the films. ©The Electrochemical Society.

关键词： Nitrogen

来源：评论

学校读者我要写书评

暂无评论

PEG/protein co-immobilized gold colloids

PEG/protein co-immobilized gold colloids

引用

54th SPSJ Symposium on Macromolecules

作者： Nagasaki, Yukio Yoshinaga, Kenji Ishii, Takehiko Iijima, Michihiro Aboshi, Fumiko Sakura, Takeshi Takahashi, Tadahito Kataoka, Kazunori Tsukuba Research Center for Interdisciplinary Materials Science University of Tsukuba 1-1-1 Tenn-noudai Tsukuba Ibaraki 305-8573 Japan Department of Materials Science Tokyo University of Science Oyama National College of Technology Preventure Program JST Department of Materials Science and Engineering Graduate School of Engineering University of Tokyo

Gold colloid possessing both lipase and PEG tethered chains on the surface was prepared by the adsorption of lipase, followed by the immobilization of the PEG/polycation block copolymer on the colloid surface. The obtained colloid showed a high dispersion stability at a high salt concentration. The enzymatic activity of the lipase on the colloid complex retained intact. Surprisingly, more than 95% of the initial enzymatic activity was retained after repeated thermal treatments (5 times) at 58°C for 10 min. The PEG condensed layer between the immobilized enzyme on the gold colloid may prevent the denaturation of the enzyme at high temperature.

关键词： Colloids

来源：评论

学校读者我要写书评

暂无评论

Preparation of Novel partially Bio-Based Thermoplastic Polyurethane / Polyacrylonitrile Electrospun Fiber Mats 21

Preparation of Novel partially Bio-Based Thermoplastic Polyu...

引用

21st International Union of materials Research Societies International Conference in Asia, IUMRS-ICA 2021

作者： Saisangtham, Suchawadee Okhawilai, Manunya Potiyaraj, Pranut Interdisciplinary Program in Petrochemistry and Polymer Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok10330 Thailand Department of Materials Science Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Bangkok10330 Thailand

The partially bio-based thermoplastic polyurethane/polyacrylonitrile electrospun fiber mats at various weight ratio was fabricated via electrospinning technique. A partially bio-based thermoplastic polyurethane was prepared from caprolactone diol and partially bio-based diisocyanate at a mole ratio of 2.1:1. Ethylene glycol was used as a chain extender. Three major effects i.e. solution concentration, distance from tip to collector and applied voltage on morphology of the obtained electrospun fiber mats were systematically investigated using a scanning electron microscope. The design of experiment, namely, Taguchi method was also applied. The morphology of the prepared electrospun fiber mats revealed continuous and smooth fibers without the formation of beads. The fiber diameters of the thermoplastic bio-based polyurethane/polyacrylonitrile were in micron size ranging from 0.2 to 1.4 µm. Moreover, the results showed that with the decrease of concentration, the fiber diameter decreased where the changes of applied voltage and distance from tip to collector resulted in negligible changes in fiber diameter. The findings can be further applied as processing conditions to meet properties requirements for the high-performance separator application. © Published under licence by IOP Publishing Ltd.

关键词： Taguchi methods

来源：评论

学校读者我要写书评

暂无评论

Nano-diamond ridge structure emission arrays capped on micro-patterned silicon pillars

Nano-diamond ridge structure emission arrays capped on micro...

引用

2009 22nd International Vacuum Nanoelectronics Conference, IVNC 2009

作者： Ghosh, N. Kang, W.P. Raina, S. Davidson, J.L. Department of Electrical Engineering Vanderbilt University Nashville TN 37235 United States Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 United States

来源：评论

学校读者我要写书评

暂无评论

9.4: The effect of ballast resistor and field screening on electron emission of nano-diamond emitters fabricated on micropatterned silicon pillar arrays

9.4: The effect of ballast resistor and field screening on e...

引用

23rd International Vacuum Nanoelectronics Conference, IVNC 2010

作者： Ghosh, Nikkon Kang, Weng Poo Rainab, Supil Davidson, Jim Department of Electrical Engineering Vanderbilt University Nashville TN 37235 United States Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN 37235 United States

ISBN: (纸本)9781424478873

This paper describes the influence of ballast resistor and field screening on the electron field emission behavior of nano-diamond emitter arrays fabricated on micropatterned silicon pillars. Arrays of 50 x 50 silicon pillars with different ballast resistances, pillar separations, capped with nano-diamond, have been fabricated on different silicon substrates as cathode for field emission testing. The goal of this study is to evaluate the fabrication method and electron emission characteristics in this configuration for field emission applications. The electron field emission results have been compared to observe the effect of the ballast resistive behavior and array spacing of micropatterned silicon pillars on the nano-diamond field emission behaviors. © 2010 IEEE.

关键词： Field emission

来源：评论

学校读者我要写书评

暂无评论

materials and devices for flexible and stretchable photodetectors and light-emitting diodes

引用

Nano Research 2021年第9期14卷 2919-2937页

作者： Jun-Kyul Song Min Sung Kim Seungwon Yoo Ja Hoon Koo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea

Recently,significant efforts have been directed at overcoming the limitations of conventional rigid optoelectronic devices,particularly their poor mechanical stability under bending,folding,and stretching *** of major approaches for rendering optoelectronic devices mechanically deformable is to replace the conventional electronic/optoelectronic materials with functional nanomaterials or organic materials that are intrinsically flexible/***,advanced device designs and unconventional fabrication methods have also contributed to the development of soft optoelectronic ***,new devices such as bio-inspired curved image sensors,wearable light emitting devices,and deformable bio-integrated optoelectronic devices have been *** this review,recent progress in the development of soft optoelectronic materials and devices is ***,various materials such as nanomaterials,organic materials,and their hybrids that are suitable for developing deformable photodetectors,are ***,the nanomaterials and organic/polymeric materials that are applicable in deformable light-emitting diodes are ***,representative system-level applications of flexible and stretchable photodetectors and light-emitting diodes are reviewed,and future prospects are discussed.

关键词： nanomaterial organic material photodetector light-emitting diode flexible optoelectronics stretchable optoelectronics

来源：评论

学校读者我要写书评

暂无评论

Luminescence of Eu^2＋ and Eu^2＋-Mn^2＋ in sodium scandium diphosphate NaScP2O7 crystal

引用

Journal of Rare Earths 2017年第5期35卷 453-459页

作者：张新民郑薇张宏志陈翠丽徐孝镇 School of Materials Science and Engineering Central South University of Forestry and Technology Changsha 410004 China Hunan Collaborative Innovation Center for Effective Utilizing of Wood & Bamboo Resource Changsha 410018 China Department of Physics and Interdisciplinary Program of Biomedical Mechanical & Electrical Engineering Pukyong National University Busan 608-737 Republic of Korea

In this work, the photoluminescence（PL） of NaScP2O7：Eu^2＋ and NaScP2O7：Eu^2＋,Mn^2＋ was investigated. Phase purity was checked using X-ray powder diffractometry（XRD）. PL excitation and emission spectra were recorded to elucidate the PL properties of NaScP2O7：Eu^2＋ and NaScP2O7：Eu^2＋,Mn^2＋. Furthermore, fluorescence lifetime measurements were performed. PL and lifetime measurements were carried out from 10 to 525 K. Moreover, the Eu^2＋ site occupation was discussed. It turned out that the incorporated Eu^2＋ ions substituted for Na＋ site and occupied two different sites. Temperature dependent PL measurements indicated the emission intensity decreased with increasing temperature due to temperature quenching in NaScP2O7：Eu^2＋. Fluorescence lifetimes of Eu^2＋ in NaScP2O7：Eu^2＋ almost did not change with a decay constant τ=~0.53 μs in the temperature range of 10–280 K, and then shortened due to temperature quenching. The luminescent lifetime reached ~0.05 μs at T=525 K. Finally, it was found that energy transfer occurred from Eu^2＋ to Mn^2＋ in co-doped NaScP2O7：Eu^2＋,Mn^2＋.

关键词： lifetime diffractometry luminescent diphosphate checked excitation incorporated decay elucidate luminescence

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：