"The surface modification, fabrication and characterization of microfluidic sensor systems for oxygen and glucose measurements with the use of polymeric materials were investigated in this dissertation. This dissertation is prepared in publication format. The first manuscript focuses on the surface modification of SU -8 layer to enhance the wettability. The improvement of wettability is critical since biofouling can be minimized during bioanalysis. A novel in situ photopattemable grafting technology was used to attach biocompatible polymer layers on SU-8 surface, changing its property from hydrophobicity to hydrophilicity. The results were confirmed by contact angle measurement and Fourier Transform Infrared (FTIR) spectra. The second manuscript demonstrates the use of modified SU-8 for applications to microfluidic sensors for dissolved oxygen measurements based on quenching behavior of fluorophore. A new chemical anchoring method was introduced to lithographically pattern sensing elements inside a complete SU-8 microfluidic channel. A stable Stem-Volmer relationship between oxygen content and fluorescent intensity was observed for two months. The third manuscript is about the fabrication and characteristic of fluorescent glucose microfluidic sensor by using an optically transparent dry film, PerMX 3050. It was possible to determine the glucose concentrations by the normalized initial reaction rates, derived from the fluorescent intensity change caused by enzymatic oxygen consumption. Novel polymer materials and surface modification technologies introduced in this dissertation have been successfully applied to optical microfluidic sensors and exhibit a large potential for many other biomolecules assay"--Abstract, page iv.
Ludlow, Douglas K.
Brown, Roger F.
Chemical and Biochemical Engineering
Ph. D. in Chemical Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Enhanced wettability of an SU-8 photoresist through a photografting procedure for bioanalytical device applications
- Sensor application of poly (ethylene glycol) diacrylate hydrogel chemically anchored on polymer surface
- A dry film fluorescence glucose microfluidic sensor with in-device PEG-based sensing element
xi, 88 pages
© 2011 Zhan Gao, All rights reserved.
Dissertation - Restricted Access
Library of Congress Subject Headings
Microfluidic devices -- Surfaces
Print OCLC #
Electronic OCLC #
Link to Catalog RecordElectronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b10251281~S5
Gao, Zhan, "Surface modification of micro-fluidic devices" (2011). Doctoral Dissertations. 81.