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Photosensitive Glass (photosensitive + glass)

Distribution by Scientific Domains

Polymers and Materials Science	50%

Selected Abstracts

Effect of Ce, Sb, and Sn on Solarization and Crystallization of an X-Ray-Irradiated Photosensitive Glass

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, Issue 1 2010
Mohamad Hassan Imanieh
The effect of Ce, Sb, and Sn photosensitive elements, individually and in combination with each other, on solarization and crystallization of an X-ray irradiated and a nonirradiated lithium silicate-based glass were investigated. According to the results, considering the crystallization behavior of the nonirradiated glasses, they were divided into Ce-bearing and Ce-free groups, in which the former group showed a clearer solarization tendency that manifested as an appearance of an absorbance peak at 318 nm in the spectrophotometry experiment. However, the results showed that in the irradiated glasses, the presence of Sb was more important in terms of improvement in crystallization view. Antimony decreased the differential thermal analysis (DTA) crystallization peak temperature from 655°C to 594°C and, in combination with the two other elements, changed the surface crystallization mechanism to a bulk one. The reactions that seemed to be responsible for the above-mentioned observations were discussed by spectrophotometry, DTA, X-ray diffraction, and scanning electron microscopic methods. [source]

Three-dimensional femtosecond laser micromachining of photosensitive glass for biomicrochips

LASER & PHOTONICS REVIEWS, Issue 3 2010
K. Sugioka
Abstract Internal modification of transparent materials such as glass can be carried out using multiphoton absorption induced by a femtosecond (fs) laser. The fs-laser modification followed by thermal treatment and successive chemical wet etching in a hydrofluoric (HF) acid solution forms three-dimensional (3D) hollow microstructures embedded in photosensitive glass. This technique is a powerful method for directly fabricating 3D microfluidic structures inside a photosensitive glass microchip. We used fabricated microchips, referred to as a nanoaquarium, for dynamic observations of living microorganisms. In addition, the present technique can also be used to form microoptical components such as micromirrors and microlenses inside the photosensitive glass, since the fabricated structures have optically flat surfaces. The integration of microfluidics and microoptical components in a single glass chip yields biophotonic microchips, in other words, optofluidics, which provide high sensitivity in absorption and fluorescence measurements of small volumes of liquid samples. [source]

Einfluss von UV-Laserparametern auf die geometrische Strukturierung von fotosensitivem Glas

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, Issue 7 2003
U. Brokmann
micro structuring; photosensitive glass; laser irradiation Abstract Der Werkstoff Glas ist zunehmend ein interessanter Konstruktionswerkstoff für die Mikrotechnik. Zur Mikrobearbeitung von fotostrukturierbaren Gläsern wird die Eigenschaft Fotosensibilität im UV-Bereich ausgenutzt. Als ,fotosensibel" gilt ein Glas u.,a. dann, wenn es unter Einfluss räumlich begrenzter energiereicher UV-Strahlung und anschließender thermischer Behandlung nur in den belichteten Bereichen kristallisiert. Die Mikrostrukturierung erfolgt durch anschließendes nasschemisches Ätzen der kristallisierten Bereiche. Die Belichtung fotosensitiver Gläser mittels konventioneller Maskaligner ist gegenwärtig Stand der Technik. Ein alternatives Verfahren dazu stellt die Belichtung mittels UV-Laserstrahlung dar. Es werden Zusammenhänge zwischen Laserparametern und erzeugten Strukturgeometrien diskutiert. Influence of UV-laser parameters on geometrical structuring of photosensitive glass Glass becomes an increasingly important material in micro system technology. A photosensitive glass crystallisizes partially after UV-exposure and thermal treatment only in exposed areas. The micro structuring of the glass takes place during a wet chemical etch process. The exposure of photosensitive glass by means of Maskaligner is currently state of the art. An alternative method is the UV-laser exposure of photosensitive glass. It will be presented the influence of laser parameters on results of micro structuring prozess. [source]