用于超声波可视化的聚合物分散液晶涂层:实验和理论
O Trushkevych1, V Reshetnyak2,3, M Turvey2
1School of Engineering, <a href="https://ror.org/01a77tt86">University of Warwick</a>, Coventry, CV4 7AL, United Kingdom.
Physical review. E
|July 18, 2024
概括
聚合物分散液晶 (PDLC) 薄膜由于声波与液晶滴的相互作用而表现出声光效应. 这项研究简化了PDLC应用程序,使可涂上视觉超声波传感器成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 声学光学学是指声学光学学.
- 聚合物科学 聚合物科学
背景情况:
- 聚合物分散液晶 (PDLC) 薄膜表现出声光学 (AO) 效应,在接触声波时变得透明.
- 在PDLC中AO效应的确切机制仍在争论中,理论探索有限.
- 之前的研究要求覆盖幻灯片和高液晶 (LC) 度,限制实际应用.
研究的目的:
- 在实验和理论上研究PDLC片中的声光效应.
- 根据对对齐的LC膜的现有理论,开发PDLC中AO效应的理论模型.
- 为了证明简化PDLC制造和降低AO应用的LC度要求.
主要方法:
- 在声波激发下对PDLC膜中的AO效应进行实验性研究.
- 使用适用于对齐的LC膜的方法,对AO效应进行理论建模.
- 极化显微镜观察声学激发过程中LC滴状形态的变化.
主要成果:
- 在PDLC中AO效应源于声波与LC液滴的直接相互作用,而不是液滴压缩.
- 声学刺激会诱导滴水形状的变化,这表明重新定位和潜在的流动效应.
- 没有封面幻灯片的PDLC电影显示了增强的AO灵敏度.
- 在LC度低至40%的重量下,可以实现AO效应.
结论:
- 该研究提供了一个理论框架,以了解PDLC中的AO效应.
- 演示了简化的PDLC制造 (没有封面滑动,较低的LC度).
- 这些进步为开发使用PDLC技术的涂装视觉超声波传感器铺平了道路.
相关概念视频
01:17Colloids and Suspensions
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
01:29The Colloidal State
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
01:15Theories of Dissolution: Diffusion Layer Model
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...