{"345831":{"#nid":"345831","#data":{"type":"event","title":"PhD Proposal Presentation - Milad Navaei","body":[{"value":"\u003Ctable width=\u0022790\u0022 border=\u00220\u0022 cellpadding=\u00220\u0022\u003E\u003Ctbody\u003E\u003Ctr\u003E\u003Ctd valign=\u0022top\u0022 width=\u002220%\u0022\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003C\/td\u003E\u003Ctd width=\u002279%\u0022\u003E\u003Cp\u003EDr. Peter Hesketh, Chair (ME) \u003Cbr \/\u003E Dr. Todd Sulchek (ME) \u003Cbr \/\u003E Dr. Mostafa Ghiaasiaan (ME) \u003Cbr \/\u003E Dr. Albert Frazier (ECE) \u003Cbr \/\u003E Dr. Oliver Brand (ECE)\u003C\/p\u003E\u003Cp\u003EDr. Jean-Marie Dimanja (Spelman college)\u003C\/p\u003E\u003C\/td\u003E\u003C\/tr\u003E\u003C\/tbody\u003E\u003C\/table\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Ctable width=\u0022790\u0022 border=\u00220\u0022 cellpadding=\u00220\u0022\u003E\u003Ctbody\u003E\u003Ctr\u003E\u003Ctd valign=\u0022top\u0022\u003E\u0026nbsp;\u003C\/td\u003E\u003Ctd\u003E\u003Cp\u003E\u003Cstrong\u003EIntegrated Micro- Gas Chromatography System for Detection of VOC gases\u003C\/strong\u003E\u003C\/p\u003E\u003C\/td\u003E\u003C\/tr\u003E\u003C\/tbody\u003E\u003C\/table\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe focus of this work is on the design and micro-fabrication of a gas chromatography column with a novel two dimensional resistance heater for fast separation of Volatile Organic Compounds (VOC). A new bonding technique is developed for proper sealing of the column. These features enable the MEMS-GC column to perform live and fast separation of the VOC gases released by pathogenic species of \u003Cem\u003EArmelaria\u003C\/em\u003E fungus to prevent the rapid spread of the fungus agents. \u0026nbsp;The major limitations of the current MEMS-GC systems are:\u0026nbsp; 1. direct fusion bonding of silicon to silicon is not an effective technique for proper bonding of a high density micro-machined surface such as the GC column.\u0026nbsp; This technique requires very smooth and clean surfaces, otherwise small voids and unbonded areas occur 2. the time and power required to ramp and sustain the column\u2019s temperature are very high for the current resistance heaters. \u0026nbsp;In this work, three enabling designs and micro-fabrication techniques are developed and validated: \u0026nbsp;three and two meters long circular GC columns are fabricated. \u2013 The aim is to design and perform both analytical and experimental validation of all silicon gas chromatograph (GC) System for high resolution separation of compounds with a gas inlet in the center and an outlet on the side. Column separation performance is first studied as a function of the length of the column and further investigated for different widths by a numerical analysis, design and experimental validation follow. A gold eutectic-fusion bonding technique is developed to improve the sealing of the column; the proper sealing of the micro-machined GC column is a critical step in GC fabrication.\u2013 The aim is to create a fabrication process for proper sealing of the GC columns using a gold eutectic bonding technique for silicon-silicon bonding; Finally, a new temperature-programming heater is developed to generate temperature gradients along the length of the column to refocus eluding bands and counteract the part of the chromatographic band spreading. Both analytical and experimental validation on the temperature gradient along the column and isothermal temperature are performed. In order to demonstrate the biological utility, the GC column is integrated into a portable GC system and the chromatograph is compared with a conventional GC column.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EPhD Proposal Presentation-\u0026nbsp;\u0022Integrated Micro- Gas Chromatography System for Detection of VOC gases\u0022- Milad Navaei\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"\u0022Integrated Micro- Gas Chromatography System for Detection of VOC gases\u0022"}],"uid":"27917","created_gmt":"2014-11-14 06:42:18","changed_gmt":"2017-04-13 21:21:07","author":"Laura Paige","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2014-12-04T14:00:00-05:00","event_time_end":"2014-12-04T16:00:00-05:00","event_time_end_last":"2014-12-04T16:00:00-05:00","gmt_time_start":"2014-12-04 19:00:00","gmt_time_end":"2014-12-04 21:00:00","gmt_time_end_last":"2014-12-04 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"65448","name":"Bioengineering Graduate Program"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78751","name":"Undergraduate students"},{"id":"78761","name":"Faculty\/Staff"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003ELaura Paige\u003C\/p\u003E\u003Cp\u003E404-385-6655\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}