We present a compact portable chip-based capillary electrophoresis system that employs capacitively coupled contactless
conductivity detection (C4D) operating at 4 MHz as an alternative detection method compared to the commonly used
optical detection based on laser-induced fluorescence. Emphasis was put on system integration and industrial
manufacturing technologies for the system. Therefore, the disposable chip for this system is fabricated out of PMMA
using injection molding; the electrodes are screen-printed or thin-film electrodes. The system is designed for the
measurement of small ionic species like Li+, Na+, K+, SO42- or NO3- typically present in foods like milk and mineral
water as well as acids e.g. in wine.
We present a compact portable chip-based capillary electrophoresis system that employs capacitively coupled contactless
conductivity detection (C4D) operating at 4 MHz as an alternative detection method compared to the commonly used
optical detection employing laser-induced fluorescence. The disposable chip for this system is fabricated out of PMMA
using injection molding; the electrodes are screen-printed or thin-film electrodes. The system allows the measurement of
small ions like Li, Na, K typically present in foodstuff like milk and mineral water as well as acids in wine.
The optical discs which can quickly record, retrieve and read enormous numbers of documents, images, music are becoming new leading products in mass media industry now. Especially CDR discs which are following the booming CD-ROM sales are becoming more and more popular. CD-R discs are compatible to CD-ROM discs, and they can record information and preserve it for long periods without changing. Because organic-dye-laid discs are relatively low cost, the application of CD-R is extending to consumer areas. In addition, we believe that in the near future CD-R duplication will replace the standard injection molding and substrate finishing process for small volume CD-ROM distribution. There are about 50 kinds of recording materials that can be used for CD-R media as summarized in Figure 1. This paper concentrates on a recording media containing a cyanine dye, because of the following features: • compatible to Orange Book Standards and available licenses through Philips (including Taiyo Yuden), • recycling of dyes can be applied and thus low costs can be achieved.
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