{"412661":{"#nid":"412661","#data":{"type":"news","title":"Research in Auxetic Behavior of Fiber Cellulose Networks Shows Promise for New Paper Applications","body":[{"value":"\u003Cp\u003EPrateek Verma\u2019s research indicates that cellulose-based fiber networks have auxetic properties that may be used to create novel functional and structural material designs for paper.\u0026nbsp; Auxetic materials grow fatter, not thinner, when stretched and are extremely rare in nature.\u0026nbsp; It had been previously reported that fibrous paper increased in thickness when stretched in a planar direction.\u003C\/p\u003E\u003Cp\u003EPrateek measured the thickness variation with stretch in different types of paper, including copy paper, paperboard, and softwood and hardwood handsheets, and showed their Poisson\u2019s ratio to be negative (0 to -3.0). \u0026nbsp;Prateek and his advisors suggest that the mechanism of the auxetic response stems from the rich hydroxyl surface of the non-woven network structure of cellulose fibers.\u0026nbsp; \u0026nbsp;During compressive stages of papermaking, hydrogen bonding between fibers locks them into a crumpled microstructure that expands when stretched.\u0026nbsp; Auxetic behavior arising from supramolecular surface chemistry of polymeric networks is a novel concept.\u003C\/p\u003E\u003Cp\u003ECurrent applications of auxetic materials include packaging, ballistic protection, filtration defouling, and prosthetic surgical implants.\u0026nbsp; Recently, researchers have also induced auxetic behavior in polyurethane foams, expanded polytetrafluoroethylene (PTFE) and ultra-high-molecular-weight polyethylene.\u003C\/p\u003E\u003Cp\u003EPrateek began his studies in 2011 at IPST, and he is seeking a PhD degree in Paper Science and Engineering within the School of Materials Science and Engineering.\u0026nbsp; His advisors are Dr. Anselm Griffin and Dr. Meisha Shofner.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Verma\u0027s researches fiber networks with auxetic properties"}],"uid":"27178","created_gmt":"2015-06-09 13:06:04","changed_gmt":"2016-10-08 03:18:33","author":"Amna Jamshad","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2013-06-01T00:00:00-04:00","iso_date":"2013-06-01T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"412651":{"id":"412651","type":"image","title":"Prateek Verma","body":null,"created":"1449254211","gmt_created":"2015-12-04 18:36:51","changed":"1475895145","gmt_changed":"2016-10-08 02:52:25","alt":"Prateek Verma","file":{"fid":"202351","name":"130826_prateek_verma.jpg","image_path":"\/sites\/default\/files\/images\/130826_prateek_verma_0.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/130826_prateek_verma_0.jpg","mime":"image\/jpeg","size":170487,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/130826_prateek_verma_0.jpg?itok=fE3P8EdS"}}},"media_ids":["412651"],"groups":[{"id":"372221","name":"Renewable Bioproducts Institute (RBI)"}],"categories":[{"id":"129","name":"Institute and Campus"},{"id":"8862","name":"Student Research"},{"id":"145","name":"Engineering"},{"id":"135","name":"Research"}],"keywords":[{"id":"7547","name":"cellulose"},{"id":"9133","name":"papermaking"},{"id":"93811","name":"RBI"},{"id":"4174","name":"renewable"},{"id":"365","name":"Research"},{"id":"127941","name":"reserach"}],"core_research_areas":[{"id":"39471","name":"Materials"},{"id":"39501","name":"People and Technology"},{"id":"39491","name":"Renewable Bioproducts"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EKelly B. Smith, Marketing \u0026amp; Communication\u003C\/p\u003E","format":"limited_html"}],"email":["kelly.smith@ipst.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}