{"668346":{"#nid":"668346","#data":{"type":"event","title":"Soft Condensed Matter Seminar - Prof. Byung Kim","body":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003ESpeaker: \u003C\/strong\u003EProf. Byung Kim,\u0026nbsp; Boise Univ.\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cbr \/\u003E\r\n\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003EHost: \u003C\/strong\u003EProf. Harold Kim\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003ETitle:\u0026nbsp;\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E: \u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDirect Observation of Self-Assembled Water Chains and their Coil-to-Bridge Transitions in a Nanoscopic Meniscus\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003EAbstract:\u0026nbsp;\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EStructures and behaviors of water confined between two surfaces are important in bio\/nano sciences and water-based nanotechnology. I report observations of self-assembled water chains and their transitions from a coil state to a bridge state in a nanoscopic water meniscus in air. Large sawtooth-like oscillatory forces were shown when the normal and friction forces were measured as a function of distance between a sharp probe and a flat oxidized silicon surfaces using a force-feedback force microscope called \u201ccantilever-based optical interfacial force microscope\u201d (COIFM). In the force-distance plot, each oscillation is comprised of a rising-shaped (\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u00f6\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E)\u0026nbsp; curve in the upward portion and a sigmoidal-shaped (\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u00f2\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E) curve in the downward portion as the tip-sample distance decreases. Further analysis of each upward portion with the freely joined chain (FJC) model reveals that each portion is developed from self-assembled water chains with lengths ranging from 14 to 42 chain units in the meniscus. The analysis of downward portions reveals that each portion is generated by a \u201ccoil-to-bridge\u201d transition of self-assembled water chains, whose lengths are between 197 and 383 chain units. The observed coil-to-bridge transitions explain many mysterious properties of confined water at the nanometer scale (e.g. long condensation distances, long nucleation timescale, high surface tension, long-range biomolecular interactions, etc.), thus dramatically improving the understanding of a variety of water systems in nature [1].\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Col\u003E\r\n\t\u003Cli\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EByung Il Kim, \u003Cem\u003ESelf-Assembled Water Chains: A Scanning Probe Microscopy Approach\u003C\/em\u003E (Springer Nature, 2023).\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/li\u003E\r\n\u003C\/ol\u003E\r\n","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EStructures and behaviors of water confined between two surfaces are important in bio\/nano sciences and water-based nanotechnology. I report observations of self-assembled water chains and their transitions from a coil state to a bridge state in a nanoscopic water meniscus in air. Large sawtooth-like oscillatory forces were shown when the normal and friction forces were measured as a function of distance between a sharp probe and a flat oxidized silicon surfaces using a force-feedback force microscope called \u201ccantilever-based optical interfacial force microscope\u201d (COIFM). In the force-distance plot, each oscillation is comprised of a rising-shaped (\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u00f6\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E)\u0026nbsp; curve in the upward portion and a sigmoidal-shaped (\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u00f2\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E) curve in the downward portion as the tip-sample distance decreases. Further analysis of each upward portion with the freely joined chain (FJC) model reveals that each portion is developed from self-assembled water chains with lengths ranging from 14 to 42 chain units in the meniscus. The analysis of downward portions reveals that each portion is generated by a \u201ccoil-to-bridge\u201d transition of self-assembled water chains, whose lengths are between 197 and 383 chain units. The observed coil-to-bridge transitions explain many mysterious properties of confined water at the nanometer scale (e.g. long condensation distances, long nucleation timescale, high surface tension, long-range biomolecular interactions, etc.), thus dramatically improving the understanding of a variety of water systems in nature [1].\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Col\u003E\r\n\t\u003Cli\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EByung Il Kim, \u003Cem\u003ESelf-Assembled Water Chains: A Scanning Probe Microscopy Approach\u003C\/em\u003E (Springer Nature, 2023).\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/li\u003E\r\n\u003C\/ol\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"Soft Matter Seminar | Prof. Byung Kim | Boise State University | Boise Idaho - Prof. Harold Kim"}],"uid":"30957","created_gmt":"2023-07-03 21:44:40","changed_gmt":"2023-09-08 14:47:26","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2023-09-12T15:00:00-04:00","event_time_end":"2023-09-12T16:00:00-04:00","event_time_end_last":"2023-09-12T16:00:00-04:00","gmt_time_start":"2023-09-12 19:00:00","gmt_time_end":"2023-09-12 20:00:00","gmt_time_end_last":"2023-09-12 20:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Howey Building - N201\/202","extras":[],"hg_media":{"671610":{"id":"671610","type":"image","title":"Prof. Byung Kim","body":null,"created":"1693959838","gmt_created":"2023-09-06 00:23:58","changed":"1693960165","gmt_changed":"2023-09-06 00:29:25","alt":"Prof. Byung Kim","file":{"fid":"254703","name":"Kim_Byung- 9.11.23.jpg","image_path":"\/sites\/default\/files\/2023\/09\/05\/Kim_Byung-%209.11.23.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/2023\/09\/05\/Kim_Byung-%209.11.23.jpg","mime":"image\/jpeg","size":10140,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2023\/09\/05\/Kim_Byung-%209.11.23.jpg?itok=u3h1vCFD"}}},"media_ids":["671610"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"166937","name":"School of Physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EProf. Harold Kim -\u003Ca href=\u0022mailto:hkim438@gatech.edu\u0022\u003Ehkim438@gatech.edu\u003C\/a\u003E\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}