Video Experimental Relacionado
Updated: Jun 25, 2026
08:48
Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
Published on: November 9, 2015
Cambio de forma térmica y UV de la topografía de la superficie
Zhongqiang Yang1, George A Herd, Stuart M Clarke
1Melville Laboratory for Polymer Synthesis, University of Cambridge, UK.
Journal of the American Chemical Society
|January 26, 2006
Resumen
Los investigadores crearon patrones de superficie reversibles que cambian de forma utilizando elastómeros cristalinos líquidos (LCE) confinados en monodomos con micropatrones. Estos materiales inteligentes cambian de forma con la luz o el calor, haciendo la transición entre estados circulares y anisotrópicos de cristal líquido.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- Ciencias de la superficie Ciencias de la superficie.
Sus antecedentes:
- Los elastómeros cristalinos líquidos (LCE) exhiben propiedades anisotrópicas únicas.
- El confinamiento de la superficie y el micropatrón son técnicas clave para controlar el comportamiento de los materiales.
- Los materiales reversibles de cambio de forma son de gran interés para aplicaciones avanzadas.
Objetivo del estudio:
- Para investigar la formación de patrones de superficie reversibles que cambian de forma.
- Explorar el papel de los micropatrones en el confinamiento de los materiales LCE en monodominio de superficie.
- Para demostrar el cambio inducido por la luz o el calor entre diferentes morfologías de superficie.
Principales métodos:
- El micropatinado de materiales LCE para crear monodominio de superficie.
- Utilizando la luz o el calor para inducir transiciones de fase en los monodominio LCE.
- Caracterizar los patrones de superficie resultantes y sus transformaciones reversibles.
Principales resultados:
- Confinamiento exitoso de materiales de LCE en monodominio de superficie a través de micropatrones.
- Demostración de patrones de superficie reversibles que cambian de forma.
- Observación de la conmutación entre rasgos circulares impresos y rasgos cristalinos líquidos anisotrópicos bajo estímulos externos (luz/calor).
Conclusiones:
- Los monodominios LCE con micropatrones permiten la creación de características de superficie dinámicas y sensibles.
- Los estímulos externos como la luz y el calor pueden alterar controlablemente la morfología de la superficie.
- Este enfoque ofrece un camino para el desarrollo de nuevas superficies inteligentes y actuadores.
Videos de Conceptos Relacionados
02:44Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:20Mechanisms of Heat Transfer II
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
01:17Radiation: Applications
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
01:05Absorption of Radiation
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation: