| 项目编号: | 1428398
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| 项目名称: | MRI: Development of a Compact Instrument for Measurements of Retention forces in a Controlled Environment |
| 作者: | Thomas Ho
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| 承担单位: | Lamar University Beaumont
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| 批准年: | 2013
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| 开始日期: | 2014-09-01
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| 结束日期: | 2018-08-31
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| 资助金额: | USD124885
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | temperature
; surface
; measurement
; drop
; drop retention force
; cab measurement
; compact instrument
; compact unit
; lateral force
; retention force
|
| 英文摘要: | PI: Tadmor, Rafael
Proposal: 1428398
MRI: Development of a Compact Instrument for Measurements of Retention forces in a Controlled Environment
Significance
The main goal of this proposal is to develop a new Centrifugal Adhesion Balance (CAB) model that includes temperature and humidity controls in one compact unit to enable evaluating their effect on drop retention force, and allow a systematic study of surface robustness from CAB measurements. This will make the CAB applicable to new systems, and significantly enhance its use by other researchers.
The problem of drops on surfaces has wide industrial implications related to contact lenses, eye drops, inhalation drugs, and cosmetic industry as well as implication in phenomena like deformable particles and nanotechnology. Roughness plays a crucial role in wetting properties of many surfaces in nature, and can be used to control the wettability of a surface. In some applications, it is useful to retain the drops on the surfaces, for example in the case of water-based herbicides, or in heat exchanger surface, or when trying to retain a spill. In other applications, it is desired that the drops slide off the surfaces as in oil extraction from porous rock and self-cleaning surfaces. The interest in self-cleaning surfaces is being driven by the desire to fabricate such surfaces for satellite dishes, solar energy panels, photovoltaics, exterior architectural glass, and green houses.
Technical Description
Theories initiated by Shanahan and de-Gennes and confirmed experimentally using the CAB show that a central parameter in relating normal to lateral forces is a shear modulus that corresponds just to the outmost layer of the solid surface, termed here interfacial modulus, . This property describes the surface resilience to conform its outmost layer to a liquid drop in contact with it, and is expected to be a strong function of the temperature and relative humidity. The new CAB will enable temperature and humidity controls and thereby allow measurements that lead to understanding of the influence of these parameters on for different systems. Science is also lacking in understanding of the physics related to nano-structured surfaces, and its relation to the ability of such solid structures to conform to the liquid above them. These systems are particularly sensitive to humidity and temperature. Biological surfaces are also extremely sensitive to temperature and humidity. The proposed instrument will enable systematic study of these systems. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/95853
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Thomas Ho. MRI: Development of a Compact Instrument for Measurements of Retention forces in a Controlled Environment. 2013-01-01.
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