{"id":7334,"date":"2021-10-08T11:28:16","date_gmt":"2021-10-08T09:28:16","guid":{"rendered":"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenseelectrospinning-core-sheath-functional-fibers-2\/"},"modified":"2024-06-20T11:40:14","modified_gmt":"2024-06-20T09:40:14","slug":"phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2","status":"publish","type":"events","link":"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/","title":{"rendered":"Doctoral defence:Electrospinning Core-Sheath Functional Fibers"},"content":{"rendered":"\n<section class=\"wp-block-unilux-blocks-free-section section\"><div class=\"container xl:max-w-screen-xl\">\n<p><strong>Doctoral thesis defence<\/strong><\/p>\n\n\n\n<h2 class=\"has-text-align-left wp-block-unilux-blocks-heading\"        id=\"electrospinning-core-sheath-functional-fibers\"\n    >\nElectrospinning Core-Sheath Functional Fibers<\/h2>\n\n\n\n<p>Wearable technology in general has increasingly gained interest in the last few decades and textile incorporated with functional component is one form of it. There are multiple ways to produce polymer fibers on both laboratory and industrial scales, and one of them is core\u2013sheath electrospinning, which is a powerful method for producing advanced composite fibers. Liquid crystals (LCs), are materials that readily exhibit optical response to fluctuations and change in their immediate environment. By incorporating LC within polymer fibers through the electrospinning, it is possible to create responsive LC-polymer fiber mats. However, incorporating a functional core has proven challenging for certain combinations of materials. This thesis explores and addresses some of the concerns involved in the coaxial electrospinning of fibers incorporating LCs from several standpoints.<\/p>\n\n\n\n<p>Firstly, the effect of solvents on the electrospinning process was systematically studied. Following this, an optimum viscosity with pure and mixed solvents for successful electrospinning was identified and uniform fibers with different solvent combinations was produced. Using the knowledge gained, core-sheath electrospinning with LC as the core was carried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tension between the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same time avoiding complete mixing between core and sheath.<\/p>\n\n\n\n<p>These findings can be applied to any combination of core and sheath materials and should appeal to large community of researchers. Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, the sheath polymer of the fibers was crosslinked after spinning. The resultant crosslinked fibers were easily manipulated by hand and even fully immersed in water without dissolving and without losing their functional LC core.<\/p>\n\n\n\n<p><strong>Docotral defence committee<\/strong><\/p>\n\n\n\n<ul class=\"ulux-list\">\n<li class=\"ulux-list-item\">Chairman: Dr. Anupam Sengupta, Assistant Professor, Universit\u00e9 du Luxembourg<\/li>\n\n\n\n<li class=\"ulux-list-item\">Dr Giusy Scalia, ADR, Universit\u00e9 du Luxembourg<\/li>\n\n\n\n<li class=\"ulux-list-item\">Dr Maria-Helena Godinho, Associate Professor, Universidade Nova de Lisboa<\/li>\n\n\n\n<li class=\"ulux-list-item\">Dr Margaret Frey, Professor, Cornell University<\/li>\n\n\n\n<li class=\"ulux-list-item\">Dr Jan Lagerwall, Professor, dissertation supervisor, Universit\u00e9 du Luxembourg<\/li>\n<\/ul>\n<\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>PhD Thesis DefenseFriday 08th of October 2021at 4:00 pmCampus LimpertsbergRoom BSC 0.03WebexTalk by Shameek VatsSupervisor: Professor Jan LagerwallElectrospinning Core-Sheath Functional FibersWearable technology in general has increasingly gained interest in the last few decades and textile incorporated withfunctional component is one form of it. There are multiple ways to produce polymer fibers on both laboratory and industrialscales, and one of them is core\u2013sheath electrospinning, which is a powerful method for producing advanced compositefibers. Liquid crystals (LCs), are materials that readily exhibit optical response to fluctuations and change in their immediateenvironment. By incorporating LC within polymer fibers through the electrospinning, it is possible to create responsiveLC-polymer fiber mats. However, incorporating a functional core has proven challenging for certain combinations ofmaterials. This thesis explores and addresses some of the concerns involved in the coaxial electrospinning of fibersincorporating LCs from several standpoints.Firstly, the effect of solvents on the electrospinning process was systematically studied. Following this, an optimumviscosity with pure and mixed solvents for successful electrospinning was identified and uniform fibers with differentsolvent combinatio\u00a0ns was produced. Using the knowledge gained, core-sheath electrospinning with LC as the core wascarried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tensionbetween the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same timeavoiding complete mixing between core and sheath.These findings can be applied to any combination of core and sheath materials and should appeal to large community ofresearchers.Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, thesheath polymer of the fibers was crosslinked after spinning. The resultant crosslinked fibers were easily manipulated byhand and even fully immersed in water without dissolving and without losing their functional LC core.Dissertation defense committee:Chairman: Dr. Anupam Sengupta, Assistant Professor, Universit\u00e9 du LuxembourgDr Giusy Scalia, ADR, Universit\u00e9 du LuxembourgDr. Maria-Helena Godinho, Associate Professor, Universidade Nova de LisboaDr. Margaret Frey, Professor, Cornell UniversityDr. Jan Lagerwall, Professor, dissertation supervisor, Universit\u00e9 du Luxembourg<\/p>\n","protected":false},"author":33,"featured_media":7336,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"featured_image_focal_point":[],"show_featured_caption":false,"ulux_newsletter_groups":"","uluxPostTitle":"","uluxPrePostTitle":"","_trash_the_other_posts":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"event_start_date":"2021-10-08 16:00:00","event_end_date":"2021-10-08 18:00:00","event_speaker_name":"Talk by Shameek Vats,Supervisor: Professor Jan Lagerwall","event_speaker_link":"","event_is_online":false,"event_location":"Campus Limpertsberg, BSC 0.03, WEBEX ","event_street":"","event_location_link":"https:\/\/www.uni.lu\/en\/about\/campuses\/limpertsberg-campus\/","event_zip_code":"1511","event_city":"Luxembourg","event_country":"LU"},"events-topic":[315],"events-type":[327],"organisation":[80,30,29],"authorship":[33],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Doctoral defence:Electrospinning Core-Sheath Functional Fibers - FSTM events I Uni.lu<\/title>\n<meta name=\"description\" content=\"PhD Thesis DefenseFriday 08th of October 2021at 4:00 pmCampus LimpertsbergRoom BSC 0.03WebexTalk by Shameek VatsSupervisor: Professor Jan LagerwallElectrospinning Core-Sheath Functional FibersWearable technology in general has increasingly gained interest in the last few decades and textile incorporated withfunctional component is one form of it. There are multiple ways to produce polymer fibers on both laboratory and industrialscales, and one of them is core\u2013sheath electrospinning, which is a powerful method for producing advanced compositefibers. Liquid crystals (LCs), are materials that readily exhibit optical response to fluctuations and change in their immediateenvironment. By incorporating LC within polymer fibers through the electrospinning, it is possible to create responsiveLC-polymer fiber mats. However, incorporating a functional core has proven challenging for certain combinations ofmaterials. This thesis explores and addresses some of the concerns involved in the coaxial electrospinning of fibersincorporating LCs from several standpoints.Firstly, the effect of solvents on the electrospinning process was systematically studied. Following this, an optimumviscosity with pure and mixed solvents for successful electrospinning was identified and uniform fibers with differentsolvent combinatio\u00a0ns was produced. Using the knowledge gained, core-sheath electrospinning with LC as the core wascarried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tensionbetween the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same timeavoiding complete mixing between core and sheath.These findings can be applied to any combination of core and sheath materials and should appeal to large community ofresearchers.Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, thesheath polymer of the fibers was crosslinked after spinning. The resultant crosslinked fibers were easily manipulated byhand and even fully immersed in water without dissolving and without losing their functional LC core.Dissertation defense committee:Chairman: Dr. Anupam Sengupta, Assistant Professor, Universit\u00e9 du LuxembourgDr Giusy Scalia, ADR, Universit\u00e9 du LuxembourgDr. Maria-Helena Godinho, Associate Professor, Universidade Nova de LisboaDr. Margaret Frey, Professor, Cornell UniversityDr. Jan Lagerwall, Professor, dissertation supervisor, Universit\u00e9 du Luxembourg\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Doctoral defence:Electrospinning Core-Sheath Functional Fibers\" \/>\n<meta property=\"og:description\" content=\"PhD Thesis DefenseFriday 08th of October 2021at 4:00 pmCampus LimpertsbergRoom BSC 0.03WebexTalk by Shameek VatsSupervisor: Professor Jan LagerwallElectrospinning Core-Sheath Functional FibersWearable technology in general has increasingly gained interest in the last few decades and textile incorporated withfunctional component is one form of it. There are multiple ways to produce polymer fibers on both laboratory and industrialscales, and one of them is core\u2013sheath electrospinning, which is a powerful method for producing advanced compositefibers. Liquid crystals (LCs), are materials that readily exhibit optical response to fluctuations and change in their immediateenvironment. By incorporating LC within polymer fibers through the electrospinning, it is possible to create responsiveLC-polymer fiber mats. However, incorporating a functional core has proven challenging for certain combinations ofmaterials. This thesis explores and addresses some of the concerns involved in the coaxial electrospinning of fibersincorporating LCs from several standpoints.Firstly, the effect of solvents on the electrospinning process was systematically studied. Following this, an optimumviscosity with pure and mixed solvents for successful electrospinning was identified and uniform fibers with differentsolvent combinatio\u00a0ns was produced. Using the knowledge gained, core-sheath electrospinning with LC as the core wascarried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tensionbetween the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same timeavoiding complete mixing between core and sheath.These findings can be applied to any combination of core and sheath materials and should appeal to large community ofresearchers.Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, thesheath polymer of the fibers was crosslinked after spinning. The resultant crosslinked fibers were easily manipulated byhand and even fully immersed in water without dissolving and without losing their functional LC core.Dissertation defense committee:Chairman: Dr. Anupam Sengupta, Assistant Professor, Universit\u00e9 du LuxembourgDr Giusy Scalia, ADR, Universit\u00e9 du LuxembourgDr. Maria-Helena Godinho, Associate Professor, Universidade Nova de LisboaDr. Margaret Frey, Professor, Cornell UniversityDr. Jan Lagerwall, Professor, dissertation supervisor, Universit\u00e9 du Luxembourg\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/\" \/>\n<meta property=\"og:site_name\" content=\"FSTM EN\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/fstm.uni.lu\/\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-20T09:40:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2021\/10\/default-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1125\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/\",\"url\":\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/\",\"name\":\"Doctoral defence:Electrospinning Core-Sheath Functional Fibers - FSTM events I Uni.lu\",\"isPartOf\":{\"@id\":\"https:\/\/www.uni.lu\/fstm-en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2021\/10\/default-1.jpg\",\"datePublished\":\"2021-10-08T09:28:16+00:00\",\"dateModified\":\"2024-06-20T09:40:14+00:00\",\"description\":\"PhD Thesis DefenseFriday 08th of October 2021at 4:00 pmCampus LimpertsbergRoom BSC 0.03WebexTalk by Shameek VatsSupervisor: Professor Jan LagerwallElectrospinning Core-Sheath Functional FibersWearable technology in general has increasingly gained interest in the last few decades and textile incorporated withfunctional component is one form of it. 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Using the knowledge gained, core-sheath electrospinning with LC as the core wascarried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tensionbetween the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same timeavoiding complete mixing between core and sheath.These findings can be applied to any combination of core and sheath materials and should appeal to large community ofresearchers.Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, thesheath polymer of the fibers was crosslinked after spinning. 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There are multiple ways to produce polymer fibers on both laboratory and industrialscales, and one of them is core\u2013sheath electrospinning, which is a powerful method for producing advanced compositefibers. Liquid crystals (LCs), are materials that readily exhibit optical response to fluctuations and change in their immediateenvironment. By incorporating LC within polymer fibers through the electrospinning, it is possible to create responsiveLC-polymer fiber mats. However, incorporating a functional core has proven challenging for certain combinations ofmaterials. This thesis explores and addresses some of the concerns involved in the coaxial electrospinning of fibersincorporating LCs from several standpoints.Firstly, the effect of solvents on the electrospinning process was systematically studied. Following this, an optimumviscosity with pure and mixed solvents for successful electrospinning was identified and uniform fibers with differentsolvent combinatio\u00a0ns was produced. Using the knowledge gained, core-sheath electrospinning with LC as the core wascarried out. One of the key findings of this work was, the identification of a suitable means to reduce the interfacial tensionbetween the core and sheath fluid to prevent breakup of the jet and produce uniformly filled fibers, while at the same timeavoiding complete mixing between core and sheath.These findings can be applied to any combination of core and sheath materials and should appeal to large community ofresearchers.Eventually, to achieve the durability of the LC-functionalized electrospun fiber mats for use in wearable technology, thesheath polymer of the fibers was crosslinked after spinning. The resultant crosslinked fibers were easily manipulated byhand and even fully immersed in water without dissolving and without losing their functional LC core.Dissertation defense committee:Chairman: Dr. Anupam Sengupta, Assistant Professor, Universit\u00e9 du LuxembourgDr Giusy Scalia, ADR, Universit\u00e9 du LuxembourgDr. Maria-Helena Godinho, Associate Professor, Universidade Nova de LisboaDr. Margaret Frey, Professor, Cornell UniversityDr. Jan Lagerwall, Professor, dissertation supervisor, Universit\u00e9 du Luxembourg","breadcrumb":{"@id":"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/#primaryimage","url":"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2021\/10\/default-1.jpg","contentUrl":"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2021\/10\/default-1.jpg","width":1500,"height":1125},{"@type":"BreadcrumbList","@id":"https:\/\/www.uni.lu\/fstm-en\/events\/phd-thesis-defenceelectrospinning-core-sheath-functional-fibers-2\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.uni.lu\/en"},{"@type":"ListItem","position":2,"name":"Faculty of Science, Technology and Medicine","item":"https:\/\/www.uni.lu\/fstm-en\/"},{"@type":"ListItem","position":3,"name":"Events","item":"https:\/\/www.uni.lu\/fstm-en\/events\/"},{"@type":"ListItem","position":4,"name":"Doctoral defence:Electrospinning Core-Sheath Functional Fibers"}]},{"@type":"WebSite","@id":"https:\/\/www.uni.lu\/fstm-en\/#website","url":"https:\/\/www.uni.lu\/fstm-en\/","name":"FSTM","description":"Faculty of Science, Technology and Medicine I Uni.lu","publisher":{"@id":"https:\/\/www.uni.lu\/fstm-en\/#organization"},"alternateName":"Faculty of Science, Technology and Medicine I University of Luxembourg","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.uni.lu\/fstm-en\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-GB"},{"@type":"Organization","@id":"https:\/\/www.uni.lu\/fstm-en\/#organization","name":"FSTM - University of Luxembourg I Uni.lu","alternateName":"Faculty of Science, Technology and Medicine","url":"https:\/\/www.uni.lu\/fstm-en\/","logo":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/www.uni.lu\/fstm-en\/#\/schema\/logo\/image\/","url":"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2026\/03\/03111650\/FSTM_SM-Profile_1600x1600px-scaled.jpg","contentUrl":"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2026\/03\/03111650\/FSTM_SM-Profile_1600x1600px-scaled.jpg","width":2560,"height":2560,"caption":"FSTM - University of Luxembourg I Uni.lu"},"image":{"@id":"https:\/\/www.uni.lu\/fstm-en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/fstm.uni.lu\/","https:\/\/www.linkedin.com\/showcase\/fstm-uni-lu"]}]}},"_links":{"self":[{"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events\/7334"}],"collection":[{"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events"}],"about":[{"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/types\/events"}],"author":[{"embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/users\/33"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/comments?post=7334"}],"version-history":[{"count":3,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events\/7334\/revisions"}],"predecessor-version":[{"id":19156,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events\/7334\/revisions\/19156"}],"wp:authorship":[{"embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/users\/33"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/media\/7336"}],"wp:attachment":[{"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/media?parent=7334"}],"wp:term":[{"taxonomy":"events-topic","embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events-topic?post=7334"},{"taxonomy":"events-type","embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/events-type?post=7334"},{"taxonomy":"organisation","embeddable":true,"href":"https:\/\/www.uni.lu\/fstm-en\/wp-json\/wp\/v2\/organisation?post=7334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}