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Doctoral Thesis
DOI
https://doi.org/10.11606/T.3.2012.tde-10052012-113950
Document
Author
Full name
Sergio Lopera Aristizabal
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Mansano, Ronaldo Domingues (President)
Cirino, Giuseppe Antonio
Góngora Rubio, Mário Ricardo
Ibrahim, Ricardo Cury
Zaini, Paulo Adriano
Title in Portuguese
Desenvolvimento de sistemas Lab-on-a-Chip para análises em biofísica celular.
Keywords in Portuguese
Biofísica
Lab-on-a-Chip
Micro-fluídica
Microeletrônica
PDMS
Prototipagem rápida
Abstract in Portuguese
Este estudo tem por objetivo o desenvolvimento de uma metodologia de fabricação de sistemas Lab On Chip, úteis no estudo de processos celulares, a partir da adaptação de tecnologias próprias da microeletrônica. Foram exploradas todas as etapas envolvidas na fabricação de sistemas Lab On Chip em Poli-Di-Metil-Siloxano e desenvolvidos protocolos de fabricação de moldes, técnicas de moldagem e processos de ativação de PDMS com plasma de oxigênio para sua solda química sobre diferentes materiais, obtendo uniões irreversíveis que permitem a integração com outras tecnologias como a microeletrônica em silício e o encapsulamento com cerâmica verde, completando uma metodologia que permite a prototipagem de dispositivos micro-fluídicos de multicamadas com um nível de sofisticação comparável ao estado da arte. Foi desenvolvido o protótipo de um equipamento ótico para litografia por projeção que permite a fabricação de máscaras óticas com resolução de 5 m e oferece a possibilidade de litografia em escala de cinzas para gerar canais e estruturas com relevos arbitrários. Foram adicionalmente abordados três problemas de biofísica celular, para os quais foram propostos novos dispositivos para separação de células móveis de acordo às suas velocidades lineares, dispositivos para crescimento confinado de bactérias e dispositivos para manipulação da curvatura de membranas celulares.
Title in English
Development of Lab-On-Chip systems for biophysical analysis.
Keywords in English
Biophysics
Lab-on-Chip
Microelectronics
Microfluidics
PDMS
Rapid prototyping
Abstract in English
The objective of this study is the development of a methodology for the fabrication of Lab On Chip systems, useful for the analysis of cellular processes, through the adaptation of technologies from microelectronics. All the steps involved with the fabrication of Lab on Chip system in Poly-Di-Methil-Siloxane (PDMS) were explored, developing protocols for mold fabrication, molding techniques and processes for oxygen plasma activation of PDMS for its bonding to different materials, achieving irreversible bonds that enable the integration with other technologies such as silicon microelectronics and green tape packaging. All this techniques constitute a methodology that allows the prototyping of multilayer microfluidic devices comparable with state of the art devices. It was developed the prototype of optical equipment for projection lithography capable of mask fabrication with 5 m resolution, and which offers also the capability of gray scale lithography for the generation of free form microchannels. Additionally three different problems in cellular biophysics where boarded, proposing new devices for the separation of motile cells according to their linear speeds in liquids, new devices for constrained bacterial growth and for curvature manipulation of cell membranes.
 
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Publishing Date
2012-05-11
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • ARISTIZABAL, S. L., and MANSANO, R. D. Anti-sticking Plasma Treatments for PDMS-PDMS Molding. In Latin American Workshop on Plasma Physics, Mar del Plata, 2011. BOOK OF ABSTRACTS - 14th Latin-American Workshop on Plasma Physics., 2011. Abstract.
  • MOREIRA, A. J., et al. Platinum Nanoparticle Deposition on Polymeric Membranes, for Fuel Cell Applications. In Latin American Workshop on Plasma Physics, Mar del Plata, 2011. BOOK OF ABSTRACTS - 14th Latin-American Workshop on Plasma Physics., 2011. Abstract.
  • MOUSINHO, A. P., et al. Room Temperature Deposition of Low Stress Silicon Nitride by Reactive Sputtering. In Latin American Workshop on Plasma Physics, Mar del Plata, 2011. BOOK OF ABSTRACTS - 14th Latin-American Workshop on Plasma Physics., 2011. Abstract.
All rights of the thesis/dissertation are from the authors
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