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CATEGORIES:Materials Chemistry Research Interest Group
SUMMARY:Bioinspired Nano- and Microstructured Surfaces: Fr
 om Analysis and Replication to Applications - Prof
 . Dr. Hendrik Hoelscher (Karlsruhe Institute of Te
 chnology\, Institute of Microstructure Technology\
 , Germany)
DTSTART;TZID=Europe/London:20200226T140000
DTEND;TZID=Europe/London:20200226T150000
UID:TALK138817AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/138817
DESCRIPTION:Many nano- and microstructured surfaces found in n
 ature can serve as an inspiration for im-proving t
 echnical applications. Although most biomimetic ar
 chetypes can be replicated with advanced technique
 s on a lab-scale\, it remains a challenge to devel
 op processes for large-scale fabrication technique
 s appropriate for commercial applications. Here\, 
 I review some recent approaches with high potentia
 l for up-scaling. \n\nThe super-hydrophobic surfac
 es of water ferns like Salvinia and Pistia can be 
 mimicked with nanofur\, a dense fur of nanoscale h
 air hot pulled from polymer surfaces. This fractal
  surface can be utilized as a coating for solar ce
 lls and OLEDS. It enables self-cleaning while impr
 ov-ing optical efficiency at the same time [1\, 2]
 . \n\nThe scales of the black butterfly Pachliopta
  aristolochiae are micro- and nanostructured and h
 arvest sunlight over a wide spectral and angular r
 ange. We fabricated such bio-inspired ab-sorbers u
 sing a scalable\, self-assembly patterning techniq
 ue based on the phase separation of a binary polym
 ers mixture. Such nano-patterned absorbers achieve
  a relative integrated ab-sorption increase of 90%
  at normal incident angle of light to as high as 2
 00% at large incident angles [3].\n\nWhite beetles
  of the genus Cyphochilus are well-known for their
  scales producing a nearly perfect whiteness in a 
 very efficient way with an astonishing low amount 
 of material. Inspired by this biological architect
 ure\, we developed two techniques allowing for the
  fabrication of ultra-thin\, yet highly scattering
 \, white polymer films. Both approaches can be uti
 lized for vari-ous applications ranging from extre
 mely white but ultra-thin coatings to scattering p
 articles as potential replacements for titanium di
 oxide.\n\n[1] 	F. Vüllers\, G. Gomard\, J. B. Prei
 nfalk\, E. Klampaftis\, M. Worgull\, B. S. Richard
 s\, H. Hölscher\, M. N. Ka-valenka\, Bioinspired S
 uperhydrophobic Highly Transmissive Films for Opti
 cal Applications\, Small 12\, 6144–6152 (2016)\n\n
 [2]	F. Vüllers\, B. Fritz\, A. Roslizar\, A. Strie
 gel\, M. Guttmann\, B. S. Richards\, H. Hölscher\,
  G. Gomard\, E. Klampaftis\, M. Kavalenka\, Self-C
 leaning Disordered Microcavity Array for Photovolt
 aic Modules\, ACS Appl. Mater. Interfaces 10\, 292
 9 (2018)\n\n[3] 	R. H. Siddique\, Y. J. Donie\, G.
  Gomard\, S. Yalamanchili\, T. Merdzhanova\, U. Le
 mmer\, H. Hölscher\, Bio-inspired Phase Separated 
 Disordered Nanoholes for Thin Photovoltaic Absorbe
 rs\, Sci. Adv. 3\, e1700232 (2017)\n\n[4]	J. Syuri
 k\, R. H. Siddique\, A. Dollmann\, G. Gomard\, M. 
 Schneider\, M. Worgull\, G. Wiegand\, H. Hölscher.
  Bio-inspired\, large scale\, highly scattering fi
 lms for nanoparticle-alternative white surfaces\, 
 Sci. Rep. 7\, 46637 (2017).\n\n[5]	J. Syurik\, G. 
 Jacucci\, O. D. Onelli\, H. Hölscher\, S. Vignolin
 i. Bio-inspired Highly Scattering Networks via Pol
 ymer Phase Separation\, Adv. Funct. Mater. 28\, 17
 06901 (2018).\n
LOCATION:PfizerLecture Theatre\,  Department of Chemistry\,
  Lensfield Road
CONTACT:Lingtao Kong
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