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SUMMARY:Thesis Defense: Seungri (Victor) Kim
DESCRIPTION:The Effects of Nanoconfined Liquid Properties on the Water-Responsive Behavior of Bacterial Cell Walls\n  \nAbstract: Water-responsive (WR) materials have the ability to mechanically swell and shrink in response to changes in relative humidity (RH). These WR materials are used by many biological systems to perform essential tasks; for example\, pinecones use WR materials to release their seeds in dry environments\, and wheat awns open and close to propel seeds into the soil\, driven by daily RH changes. The WR actuation of some biomaterials is extremely powerful\, for example Bacillus subtilis cell walls display record-high actuation energy and power densities of 72 MJ m-3 and 9.1 MW m-3\, surpassing those of all existing muscles and actuator materials. They hold great potential to be used as high-performance actuators for various applications\, including energy harvesting\, robotics\, and morphing structures. However\, the fundamental mechanisms of WR actuation are still poorly understood. Despite the unclear WR mechanism\, recent studies have provided compelling evidence of the critical role that the properties of nanoconfined water play in these observed high-power WR actuation\, and thus\, adjusting the properties of nanoconfined water should substantially affect WR behavior and performance. \nThis thesis investigates the role of nanoconfined liquids in the WR actuation of bacterial cell walls\, focusing on how modifying their behavior can improve WR performance. In this research\, cell walls of E. coli\, S. aureus\, S. cerevisiae and B. subtilis were extracted and used to investigate the properties of their nanoconfined water. Based on these findings\, we further explored the effects of kosmotropic and chaotropic solutes\, known to stabilize or disrupt hydrogen bonding networks\, on the WR performance of B. subtilis cell walls. We discovered that cell walls treated with low-concentration kosmotropic solutes exhibited a significant increase in WR actuation energy density\, reaching 103.3 MJ m-3. However\, higher concentrations of kosmotropic or chaotropic solutes led to decreased WR performance. Our observations suggest the presence of an optimal range for kosmotropic and chaotropic treatments to enhance WR energy density. These findings could be explained by the impact of the solutes on hydration forces and intermolecular interactions\, which affect the ultimate WR pressure. This\, in turn\, provides a pathway towards achieving superior WR actuation performance and advancing the development of high-work-density actuator materials for diverse industrial applications. \n  \nPlease use the Zoom meeting link below if you cannot attend in person. \nMeeting ID: https://ccny.zoom.us/j/8366033109?pwd=WTZZVzRNZllQUWhsc2RnRHdiN1hWUT09 \nLink to Announcement \n 
URL:https://asrc.gc.cuny.edu/event/thesis-defense-seungri-victor-kim/
LOCATION:ASRC 5th Floor Data Visualization Room\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Nanoscience
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DTSTART;TZID=America/New_York:20241119T140000
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SUMMARY:NanoBioNYC workshop: A glance at using National Laboratory Facilities
DESCRIPTION:Join us for an informative online workshop on Tuesday\, November 19 at 2:00 pm on the application process for using facilities at Brookhaven National Laboratory (BNL)\, BNL Center for Functional Nanomaterials and other synchrotron facilities. \nThis workshop will be presented by Dr. Maya N. Nair\, Research Assistant Professor and core facility staff at the Surface Science and Nanofabrication facilities at the Nanoscience initiative at ASRC and Dr. Kübra Kaygisiz\, Postdoctoral Research Associate in Prof. Rein Ulijn’s lab. They will share their experiences and insights into navigating the process and maximizing the opportunities at these facilities. \nRSVP now to secure your spot. We look forward to seeing you there! \n  \n \nBio-Maya N. Nair is a research assistant professor and core facility staff at surface science and nanofabrication facilities at nanoscience initiative at ASRC\, CUNY since 2019. She earned her PhD in Physics from University of Haute Alsace Mulhouse\, France. Following her doctoral work\, she held research positions at Synchrotron SOLEIL\, Paris\, Indian Institute Science\, Banglore\, India and KU Leuven\, Belgium. Dr. Nair conducts research in nanomaterials mainly focusing on nanoelectronics applications. Her research interests include synthesis of two-dimensional(2D) materials\, functionalization and their characterization using various scanning probe microscopies and synchrotron-based photoemission spectroscopies. \n \nBio-Kübra obtained her Ph.D degree in 2023 from the Max Planck Institute for Polymer Research\, Germany. Now\, in her postdoctoral research in Prof. Rein Ulijn’s lab she focuses on the bottom-up synthesis of complex and adaptive peptide systems. For her research on discovery of peptide formulations for drug delivery she collaborates with the Center for Functional Nanomaterials at Brookhaven National Laboratory\, where she works with an automated liquid handling system. \n 
URL:https://asrc.gc.cuny.edu/event/nanobionyc-workshop-a-glance-at-using-national-laboratory-facilities/
LOCATION:Online
CATEGORIES:Nanoscience
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