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SUMMARY:Viscous Flow Engineering: a Novel Approach for the Scalable Fabric
 ation of Advanced Multi-material Fibers and Metasurfaces
DTSTART:20171208T151500
DTSTAMP:20260413T205209Z
UID:ad1743a65540c3385a64fbd15b208d1b6e140ca8feecc8d5b82c3b6f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Fabien Sorin\, Institute of Materials\, EPFL\nThe dewetting o
 f thin polymeric films and the thermal drawing of polymer and glass fiber
 s are two seemingly very different processes. They can however both be d
 escribed for a large part via an interplay between viscosity and surface 
 tension [1]. In this talk\, we will first show how we can control the sol
 id-state dewetting of thin\, high refractive index optical glass layers 
 onto patterned polymer substrates to realize high–quality optical metas
 urfaces. We will investigate how the interplay between viscous flow at t
 he nanoscale and surface tension enables to tailor the size and shape of 
 chaclogenide glasses nano-objects and hence control their optical propert
 ies. Second\, we will present how we can apply similar principles to the
  process of thermal drawing – the same process used to fabricate optica
 l fibers – to realize multi-material fibers and ribbons with advanced 
 optical and electronic functionalities [2]. In particular\, we will show 
 how we can fabricate thin and flexible fibers with sub-micrometer surface
  patterns by tailoring the materials surface tension. We will then demon
 strate how applying this understanding to electrically conducting polymer
  nano-composites can lead to intriguing fiber devices such as electromec
 hanical one-dimensional distributed touch sensors [3]. Turning to semico
 nductor-based fibers\, we will show how modifying the surface energy of 
 semiconducting materials in solution can enable the fabrication of single
 -crystal nanowire-based optoelectronic fibers with unprecedented performa
 nce [4]. Finally\, we propose for the first time to tailor the viscosity
  of materials during thermal drawing by looking at rheological and micros
 tructural attributes at a deeper level. We will in particular show how we
  could identify some elastomeric materials that can be drawn with flow p
 roperties similar to their thermoplastic counterparts. This opens novel 
 opportunities for fiber-based devices in the fields of stretchable optics 
 and electronics as well as biological probes and smart textiles.\n\nRefer
 ences\n[1] M. Schmidt et al. Advanced Optical Materials\, 2016\, 4\, 1
 3.\n[2] T. Nguyen et al. Advanced Functional Materials\, 2017\, 27\, 1
 605935.\n[3] T. Nguyen et al. J. of Physics D: Appl. Phys.\, 2017\, 
 50\, 144001.\n[4] W. Yan et al\, Advanced Materials\, 2017\, 29\, 1700
 681.\nAbout the research of the speaker: https://fimap.epfl.ch\n 
LOCATION:CE 1 5 https://plan.epfl.ch/?room==CE%201%205
STATUS:CONFIRMED
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