Kinks and Surface Potentials

扭结和表面电位

基本信息

  • 批准号:
    9814055
  • 负责人:
  • 金额:
    $ 29.95万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    1998
  • 资助国家:
    美国
  • 起止时间:
    1998-12-01 至 2002-11-30
  • 项目状态:
    已结题

项目摘要

9814055SpenceThis project addresses dislocation kink dynamics, and measurement of the Coulomb potential normal to a surface by quantitative convergent-beam reflection high energy diffraction (Micro-probe RHEED). Dislocation kinks will be observed by atomic resolution TEM in materials such as sapphire, SiC and MgO, where it has been found possible to prepare atomically flat terraced surfaces for thin TEM samples under moderate (10-7 Torr) vacuum conditions by annealing in oxygen or vacuum. "Forbidden" Bragg reflections, arising from the stacking fault between partial dislocations, will be used to form lattice images, allowing images to be formed without surface noise. The approach is to determine which process (kink formation, kink migration or obstacles along the dislocation line) limits kink (and hence dislocation) velocity, for given conditions of temperature and stress. By extending prior quantitative convergent-beam TEM measurements of bonding in crystals to the RHEED geometry, it is planned to refine the electrostatic potential extending into the vacuum from ceramic surfaces. This potential is critical for chemical reactions at surfaces, for adsorption, catalysis, epitaxy, the diffusion bonding process, oxidation, and semiconductor crystal growth. The surface potential barrier is also critical in electronic processes, such as field emission and secondary electron emission. Measurements of the modification to this potential which result from the deposition of a monolayer or more, of atoms can provide a direct experimental understanding of how bonds are formed at surfaces, and of the modification of atomic charge densities.%%%The project addresses basic research issues in a topical area of materials science having high potential technological relevance. The research will contribute basic materials science knowledge at a fundamental level to new aspects of electronic/photonic devices. Experimental tools are now available to allow atomic level observation of elementary surface processes which when better understood allow advances in fundamental science and technology. The basic knowledge and understanding gained from the research is expected to contribute to improving the performance and stability of advanced devices and circuits by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area.***9814055SpenceThis project addresses dislocation kink dynamics, and measurement of the Coulomb potential normal to a surface by quantitative convergent-beam reflection high energy diffraction (Micro-probe RHEED). Dislocation kinks will be observed by atomic resolution TEM in materials such as sapphire, SiC and MgO, where it has been found possible to prepare atomically flat terraced surfaces for thin TEM samples under moderate (10-7 Torr) vacuum conditions by annealing in oxygen or vacuum. "Forbidden" Bragg reflections, arising from the stacking fault between partial dislocations, will be used to form lattice images, allowing images to be formed without surface noise. The approach is to determine which process (kink formation, kink migration or obstacles along the dislocation line) limits kink (and hence dislocation) velocity, for given conditions of temperature and stress. By extending prior quantitative convergent-beam TEM measurements of bonding in crystals to the RHEED geometry, it is planned to refine the electrostatic potential extending into the vacuum from ceramic surfaces. This potential is critical for chemical reactions at surfaces, for adsorption, catalysis, epitaxy, the diffusion bonding process, oxidation, and semiconductor crystal growth. The surface potential barrier is also critical in electronic processes, such as field emission and secondary electron emission. Measurements of the modification to this potential which result from the deposition of a monolayer or more, of atoms can provide a direct experimental understanding of how bonds are formed at surfaces, and of the modification of atomic charge densities.%%%The project addresses basic research issues in a topical area of materials science having high potential technological relevance. The research will contribute basic materials science knowledge at a fundamental level to new aspects of electronic/photonic devices. Experimental tools are now available to allow atomic level observation of elementary surface processes which when better understood allow advances in fundamental science and technology. The basic knowledge and understanding gained from the research is expected to contribute to improving the performance and stability of advanced devices and circuits by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area.***
9814055SpenceThis project addresses dislocation kink dynamics,and measurement of Coulomb potential normal to a surface by quantitative convergent-beam reflection high energy diffraction(Micro-probe RHEED).位错扭结将通过原子分辨率TEM在诸如蓝宝石、SiC和MgO的材料中观察到,其中已经发现可以通过在氧气或真空中退火在中等(10-7托)真空条件下为薄TEM样品制备原子级平坦的阶梯表面。“禁止”布拉格反射,产生于部分位错之间的堆垛层错,将用于形成晶格图像,允许图像形成没有表面噪声。该方法是确定在给定的温度和应力条件下,哪个过程(扭结形成、扭结迁移或沿着位错线的障碍物)限制了扭结(并因此限制了位错)的速度。通过扩展以前的定量会聚束TEM测量晶体中的RHEED几何形状的结合,它计划细化从陶瓷表面延伸到真空中的静电势。这种电势对于表面的化学反应、吸附、催化、外延、扩散结合过程、氧化和半导体晶体生长至关重要。表面势垒在场致发射和二次电子发射等电子过程中也很重要。测量由单层或多层原子的沉积引起的对该电势的修改,可以提供对表面如何形成键以及原子电荷密度的修改的直接实验理解。该项目涉及材料科学专题领域的基础研究问题,具有很高的潜在技术相关性。该研究将为电子/光子器件的新方面提供基础材料科学知识。 现在已有实验工具,可以在原子水平上观察基本表面过程,如果能更好地了解这些过程,就可以在基础科学和技术方面取得进展。从研究中获得的基本知识和理解预计将有助于提高先进器件和电路的性能和稳定性,为设计和生产改进的材料和材料组合提供基本的理解和基础。 该计划的一个重要特点是通过在一个基本和技术上重要的领域对学生进行培训来整合研究和教育。9814055SpenceThis project addresses dislocation kink dynamics,and measurement of Coulomb potential normal to a surface by quantitative convergent-beam reflection high energy diffraction(Micro-probe RHEED).位错扭结将通过原子分辨率TEM在诸如蓝宝石、SiC和MgO的材料中观察到,其中已经发现可以通过在氧气或真空中退火在中等(10-7托)真空条件下为薄TEM样品制备原子级平坦的阶梯表面。“禁止”布拉格反射,产生于部分位错之间的堆垛层错,将用于形成晶格图像,允许图像形成没有表面噪声。该方法是确定在给定的温度和应力条件下,哪个过程(扭结形成、扭结迁移或沿着位错线的障碍物)限制了扭结(并因此限制了位错)的速度。通过扩展以前的定量会聚束TEM测量晶体中的RHEED几何形状的结合,它计划细化从陶瓷表面延伸到真空中的静电势。这种电势对于表面的化学反应、吸附、催化、外延、扩散结合过程、氧化和半导体晶体生长至关重要。表面势垒在场致发射和二次电子发射等电子过程中也很重要。测量由单层或多层原子的沉积引起的对该电势的修改,可以提供对表面如何形成键以及原子电荷密度的修改的直接实验理解。该项目涉及材料科学专题领域的基础研究问题,具有很高的潜在技术相关性。该研究将为电子/光子器件的新方面提供基础材料科学知识。 现在已有实验工具,可以在原子水平上观察基本表面过程,如果能更好地了解这些过程,就可以在基础科学和技术方面取得进展。从研究中获得的基本知识和理解预计将有助于提高先进器件和电路的性能和稳定性,为设计和生产改进的材料和材料组合提供基本的理解和基础。 该计划的一个重要特点是通过在一个基本和技术上重要的领域对学生进行培训来整合研究和教育。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

John Spence其他文献

Harmonic pictures in a flash
瞬间的和谐画面
  • DOI:
    10.1038/449553a
  • 发表时间:
    2007-10-03
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    John Spence
  • 通讯作者:
    John Spence
A protocol for quantifying the carbon reductions achieved through the provision of low or zero carbon ICT services
量化通过提供低碳或零碳 ICT 服务实现的碳减排量的协议
  • DOI:
  • 发表时间:
    2012
  • 期刊:
  • 影响因子:
    0
  • 作者:
    P. Steenhof;Chris Weber;Martin Brooks;John Spence;Randall Robinson;R. Simmonds;C. Kiddle;D. Aikema;M. Savoie;Bobby Ho;M. Lemay;Jonathan Fung;M. Cheriet
  • 通讯作者:
    M. Cheriet
THU490 - A randomized control trial evaluating the impact of a web-based mind-body wellness intervention for patients with primary biliary cholangitis
THU490 - 一项评估基于网络的身心健康干预对原发性胆汁性胆管炎患者影响的随机对照试验
  • DOI:
    10.1016/s0168-8278(22)01038-8
  • 发表时间:
    2022-07-01
  • 期刊:
  • 影响因子:
    33.000
  • 作者:
    Makayla Watt;Ashley Hyde;John Spence;Gail Wright;Shauna Vander Well;Emily Johnson;Andrew L. Mason;Hin HIn Ko;Edward Tam;Puneeta Tandon
  • 通讯作者:
    Puneeta Tandon
Predicting response to neoadjuvant chemotherapy in breast cancer by biomechanics quantified with magnetic resonance elastography
通过磁共振弹性成像量化的生物力学预测乳腺癌新辅助化疗的反应
  • DOI:
    10.1016/j.ejso.2024.108145
  • 发表时间:
    2024-05-01
  • 期刊:
  • 影响因子:
    2.900
  • 作者:
    Aaditya Sinha;Patriek Jurrius;Omar Darwish;Belul Shifa;Zhane Peterson;Hannah Jeffery;Karen Walsh;Anna Metafa;John Spence;Ashutosh Kothari;Hisham Hamed;Georgina Bitsakou;Vasileios Karydakis;Mangesh Thorat;Elina Shaari;Ali Sever;Anne Rigg;Kesthra Satchithananda;Tony Ng;Sarah Pinder;Arnie Purushotham
  • 通讯作者:
    Arnie Purushotham
Holograms of atoms
原子的全息图
  • DOI:
    10.1038/35074228
  • 发表时间:
    2001-04-26
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    John Spence
  • 通讯作者:
    John Spence

John Spence的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

{{ truncateString('John Spence', 18)}}的其他基金

MRI: Acquisition of Cryo-EM for Southwest Regional Center
MRI:为西南区域中心采购冷冻电镜
  • 批准号:
    1531991
  • 财政年份:
    2015
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Standard Grant
BioFEL Workshop at Lawrence Berekeley Laboratory on January 18-21, 2011.
BioFEL 研讨会于 2011 年 1 月 18 日至 21 日在 Lawrence Berekeley 实验室举行。
  • 批准号:
    1101357
  • 财政年份:
    2011
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Standard Grant
Dynamics of Electron Transfer-PSI/Ferredoxin
电子转移动力学-PSI/铁氧还蛋白
  • 批准号:
    1021557
  • 财政年份:
    2010
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Standard Grant
Protein Beam Diffraction
蛋白质束衍射
  • 批准号:
    0555845
  • 财政年份:
    2006
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
SGER: Serial Crystallography
SGER:系列晶体学
  • 批准号:
    0429814
  • 财政年份:
    2004
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Standard Grant
Ordering/Lithography in Glasses/Alloys
玻璃/合金订购/光刻
  • 批准号:
    0245702
  • 财政年份:
    2003
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
Charge States in Ceramics
陶瓷中的电荷态
  • 批准号:
    9973894
  • 财政年份:
    1999
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
Acquisition of Image Plate Reader and Development of Scanning Atom Probe
图像读板机的购置和扫描原子探针的开发
  • 批准号:
    9625553
  • 财政年份:
    1996
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Standard Grant
Atomistics of Kinks and Surfactants
扭结和表面活性剂的原子学
  • 批准号:
    9526100
  • 财政年份:
    1995
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
Bulk and Interface Bonding in Ceramics and Intermetallics
陶瓷和金属间化合物中的本体键合和界面键合
  • 批准号:
    9412146
  • 财政年份:
    1995
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant

相似国自然基金

“surface-17”量子纠错码在超导量子电路中的实现
  • 批准号:
  • 批准年份:
    2021
  • 资助金额:
    30 万元
  • 项目类别:
    青年科学基金项目
Space-surface Multi-GNSS机会信号感知植生参数建模与融合方法研究
  • 批准号:
    41974039
  • 批准年份:
    2019
  • 资助金额:
    63.0 万元
  • 项目类别:
    面上项目
基于surface hopping方法探索有机半导体中激子解体机制
  • 批准号:
    LY19A040007
  • 批准年份:
    2018
  • 资助金额:
    0.0 万元
  • 项目类别:
    省市级项目
基于强自旋轨道耦合纳米线自旋量子比特的Surface code量子计算实验研究
  • 批准号:
    11574379
  • 批准年份:
    2015
  • 资助金额:
    73.0 万元
  • 项目类别:
    面上项目
全空间中临界Surface Quasi-geostrophic方程的全局吸引子及其分形维数
  • 批准号:
    11426209
  • 批准年份:
    2014
  • 资助金额:
    3.0 万元
  • 项目类别:
    数学天元基金项目
Nano/Micro-surface pattern的摩擦特性研究
  • 批准号:
    50765008
  • 批准年份:
    2007
  • 资助金额:
    22.0 万元
  • 项目类别:
    地区科学基金项目

相似海外基金

Electronic origin of surface potentials in bioactive ceramics
生物活性陶瓷表面电势的电子起源
  • 批准号:
    19K22048
  • 财政年份:
    2019
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Grant-in-Aid for Challenging Research (Exploratory)
Development of bio-alarm utilizing vegetation bio-electric potentials detecting surface failure
利用植被生物电位检测表面故障的生物警报器的开发
  • 批准号:
    19K15089
  • 财政年份:
    2019
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Grant-in-Aid for Early-Career Scientists
CAREER: Resolving action potentials and high-density neural signals from the surface of the brain
职业:解析来自大脑表面的动作电位和高密度神经信号
  • 批准号:
    1752274
  • 财政年份:
    2018
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
Optimization of two Surface Treaments (Plasma and Pluronic) for an Array of Gold Microelectrodes for Measuring Streaming Potentials on Articular Cartilage
用于测量关节软骨流动电位的金微电极阵列的两种表面处理(等离子体和 Pluronic)的优化
  • 批准号:
    514084-2017
  • 财政年份:
    2017
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Engage Grants Program
NeuroGrid: a scalable system for large-scale recording of action potentials from the brain surface
NeuroGrid:用于大规模记录大脑表面动作电位的可扩展系统
  • 批准号:
    9357409
  • 财政年份:
    2016
  • 资助金额:
    $ 29.95万
  • 项目类别:
Correlation between surface potentials and surface oxygen exchange coefficents of CeO2
CeO2表面电位与表面氧交换系数的相关性
  • 批准号:
    267908922
  • 财政年份:
    2015
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Research Grants
Development of automatic infusion systems for sedatives and analgesics with surface EEGs and Auditory Evoked Potentials as Input Signals
开发以表面脑电图和听觉诱发电位作为输入信号的镇静镇痛药自动输注系统
  • 批准号:
    12671462
  • 财政年份:
    2000
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Surface Potentials and Second Messengers
表面电势和第二信使
  • 批准号:
    9117526
  • 财政年份:
    1992
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
Surface Potentials and Second Messengers
表面电势和第二信使
  • 批准号:
    8815042
  • 财政年份:
    1989
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Continuing Grant
An experimental research on skull-surface recording of vestibular evoked potentials
头骨表面记录前庭诱发电位的实验研究
  • 批准号:
    01480409
  • 财政年份:
    1989
  • 资助金额:
    $ 29.95万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了