Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session X58: Lessons from Biological Soft Materials and Their ApplicationsInvited Undergraduate
|
Hide Abstracts |
Sponsoring Units: GSOFT DBIO Chair: Kyoo-Chul Park, Northwestern Univ Room: LACC Petree Hall C |
Friday, March 9, 2018 8:00AM - 8:36AM |
X58.00001: Hierarchy and architecture - tailoring physical associations toward functional networks and gels Invited Speaker: LaShanda Korley Taking cues from biological systems, we are interested in understanding how physical associations may be utilized in the design of functional materials: (1) supramolecular networks and elastomers, and (2) peptide-polymer hybrids. |
Friday, March 9, 2018 8:36AM - 9:12AM |
X58.00002: Bioinspired micropatterned adhesives – from micromechanics to robotic function Invited Speaker: Eduard Arzt 3D micropatterning of surfaces signifies a recent paradigm shift for control of surface functionalities: the exploitation of judiciously designed surface protrusions, “fibrils” and other features at the micron scale. This talk will give an overview of our successful attempts to create bioinspired adhesive surfacesby micropatterning, with special emphasis on mechanisms and modeling. Interesting size effects appear in adhesion, both on the level of single fibrils and on the higher level of hierarchy of single arrays. Our principle of "contact splitting“, i.e. the gain in intermolecular adhesion due to a multitude of fine fibrillar contacts instead of one monolithic contact region, allows good Van der Waals contact between the surfaces while establishing little elastic strain. We have also shown that a switching action to a non-adhesive state can reproducibly achieved, for example, by inducing bending and Euler buckling in the fibrils. An important element of our work is the numerical simulation of the adhesion performance as a function of materials and structure parameters, which has allowed us to rationally optimize our structures for particular applications. More recently, we have extended our adhesive systems to address also biological surfaces, especially skin. These properties make gecko surfaces interesting for innovative surgical procedures. Currently, these principles are being exploited to create new surface solutions for robotic pick-and-place systems, assembly machines, in space technology and biomedicine. |
Friday, March 9, 2018 9:12AM - 9:48AM |
X58.00003: Biomimetic Self-Templating Materials and Applications Invited Speaker: Seung-Wuk Lee In nature, helical macromolecules such as collagen, chitin and cellulose are critical to the morphogenesis and functionality of various hierarchically structured materials. During morphogenesis, these chiral macromolecules are secreted and undergo self-templating assembly, a process whereby multiple kinetic factors influence the assembly of the incoming building blocks to produce non-equilibrium structures. A single macromolecule can form diverse functional structures when self-templated under different conditions. Collagen type I, for instance, forms transparent corneal tissues from orthogonally aligned nematic fibers, distinctively colored skin tissues from cholesteric phase fiber bundles, and mineralized tissues from hierarchically organized fibers. Nature’s self-templated materials surpass the functional and structural complexity achievable by current top-down and bottom-up fabrication methods. However, self-templating has not been thoroughly explored for engineering synthetic materials. |
Friday, March 9, 2018 9:48AM - 10:24AM |
X58.00004: Dynamic optical materials - Painting opals with water and light Invited Speaker: Fiorenzo Omenetto Light control in natural structures is a based on wondrous interplay between electromagnetic radiation and the patterns and compositions of natural materials compounded by biochemical processes that lead to spectral selectivity, reflections, diffusion, and photoconversion, to name a few. These natural strategies have offered inspiration on how to emulate their behavior and performance and considerable effort is dedicated in mimicking the structures that are ubiquitous in the world that surrounds us. In this context, a particularly interesting approach is to employ Nature's materials to generate structures that manipulate light in controllable and efficient ways. In this talk we will review different uses and transformation of structural proteins (with specific focus on silk) to describe active and passive optical devices based on biopolymers substrates. Multiple devices, ranging from diffractive optics, photonic crystals, microresonators and lasers, will be described. The possibility of embedding seamlessly into the biopolymeric matrices biological function allows for facile fabrication and doping of photonic components that have renewed utility at the interface between biology and photonics. . |
Friday, March 9, 2018 10:24AM - 11:00AM |
X58.00005: Diving birds and wettability-tunable leaves Invited Speaker: Sunghwan Jung In this talk, I will discuss two problems in which mechanics principles affect form and function of animals or plants, as a result of evolutionary adaptations in nature. The first problem is how several seabirds (e.g. Gannets and Boobies) dive into water at up to 24 m/s without any injuries. This study examines the effects of their beak shape and dense feathers during water entry to reduce or spread the impact force on the body. We found that a specific beak and skull shape was chosen to minimize the water-entering force, and dense feathers also spread the impact too. The second problem is how tree leaves change their surface structure over season. In the fall, the wettability of Katsura leaves increases primarily due to the erosion of the second-tier (epicuticular wax) roughness features and the flattening of the first-tier (epidermal cells) surface features. Increased wettability during the fall may accelerate the leaf shedding processes by catching dew or rain droplets. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700