PHOTONANOFLUIDIX · Self-assembly of confined colloidal objects for the study of nano-optic phenomena
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2009-05-01 → 2011-04-30
- Финансиране от ЕС
- 250 701 €
- Участници
- 1
- Схема
- MC-IEF
Линиите свързват координатора с партньорите.
Накратко на български
Нанообекти в течности се подреждат в структури чрез специални електростатични капани, които ги държат на място. Това помага за по-доброто разбиране на взаимодействията между частиците и развитието на нови технологии в биологията, материалознанието и фотониката.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Self-assembly of confined colloidal objects for the study of nano-optic phenomena
Particles in liquids are continuously buffeted about by random collisions with the surrounding bath of molecules. This means that a small particle in a fluid continuously tends to just wander away. However, fascinating things could be done if one could “trap” tiny objects, a thousand times smaller than the width of a human hair, in water. Researchers have developed several different ways to do this, all of these methods entail the application of external forces to the object to hold it in place; and the smaller the object the harder the task. In our work we demonstrated an entirely passive way to trap an object in solution that works just as well for small objects as for larger ones, as long as the object carries a certain amount of charge. This new technique should enable researchers in fields ranging from biology to materials science to address fundamental questions and develop new technologies. The aim of the proposal centered on investigating geometry-induced effects on the dynamics nano-objects in confined spaces. Based on an improved understanding of the interactions we sought to optimize the self-assembly of discrete charged metal or dielectric nano-objects into arrays with lattice constants comparable to the wavelength of light and to explore the use of these structures in photonics applications. The major goals of the project have been met and resulted in a publication in Nature in 2010. In this publication we described a geometry-induced electrostatic trap for confining, arranging and manipulating single nanometric objects in solution.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
We have demonstrated the presence of attractive interactions arising in low ionic strength solution between charged soft-matter objects and highly curved regions of like-charged confining surfaces. These unexpected interactions result in stretching of DNA and trapping of colloidal particles in solution in a nanofluidic slit. This proposal seeks to further understand the attractive interactions arising between colloidal objects and like-charged confining walls in low-ionic-strength solution, in order to better control the underlying self-assembly process. The controlled self-assembly of arrays or arbitrary arrangements of discrete charged metal or dielectric nano-objects will permit the investigation of plasmonic and photonic phenomena in two dimensions, e.g., plasmonic coupling of resonantly excited metal nanoparticles, modification of fluorescence emission of single emitters diffusing in solution very close to discrete metal nano-objects, realization of novel ordered and disordered arrangements of nano-objects (e.g. dielectric particles like TiO2) for studying light scattering phenomena in two dimensions. One of the chief advantages of the self-assembly technique described here over conventional fabrication techniques is that the substrate surface structure which directs self-assembly of the optically active element acts as a “rewritable surface” enabling the investigation of the plasmonic and photonic properties of ensembles of particles of similar surface charge but variable dielectric properties.
Оригинален текст от CORDIS (на английски).
Участници
- EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH · ZuerichКоординаторШвейцария
Връзки
Данни: CORDIS, © Европейски съюз