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UID:DSC-15987
DTSTART;TZID=Europe/Berlin:20190507T133000
SEQUENCE:1557075220
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190507T143000
URL:https://www.dresden-science-calendar.de/calendar/en/detail/15987
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Gabler: Magnetic field assisted roll-up of high aspect ratio nanome
 mbranes
CLASS:PUBLIC
DESCRIPTION:Speaker: Felix Gabler\nInstitute of Speaker: IFW Dresden\nTopic
 s:\n\n Location:\n  Name: IFW (B3E.26\, IIN)\n  Street: Helmholtzstraße 2
 0\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescription: Rolled-up nanot
 echnology has been considered a powerful strategy in manufacturing micro d
 evices with various fields of application ranging from passive electronics
  through photonic resonators to biomedical platforms for cell study and de
 tection [1]. Especially micro energy storage (MES) devices such as capacit
 ors\, supercapacitors and batteries can benefit from the ability of rolled
 -up nanotechnology to self-assemble 2D patterned nanomembranes into compac
 t 3D tubular architectures by relaxation of mechanical strain as demonstra
 ted by the works on rolled-up electrostatic capacitors [2-3]. The performa
 nce potential of MES devices fabricated by rolling up nanomembranes is tre
 mendous since the electrically active area scales up with nanomembrane len
 gth while the final device footprint remains almost constant (Fig. 1a). Ho
 wever\, up to now there is no technology that enables the roll-up of nanom
 embranes with high length-to-width aspect ratio in a unidirectional and re
 producible fashion. This is mainly because a nanomembrane under isotropic 
 strain will inherently try to avoid rolling perpendicular to its short sid
 e as more strain energy can relax when rolling from the long side or in a 
 tilted way.  In this seminar\, I will introduce a novel approach to roll u
 p high aspect ratio nanomembranes with unprecedented control and speed. To
  release the nanomembranes of several millimeters in length within a reaso
 nable time\, a wet release platform based on encapsulated methyl cellulose
  with roll-up speed up to 500 µm/s was applied. In order to achieve unidi
 rectional rolling over such length scales\, ferromagnetic material was inc
 orporated into the nanomembrane and the self-assembly was performed under 
 influence of an external magnetic field. This magnetic field assistance he
 lps to make tilted rolling energetically unfavorable (Fig 1b). Furthermore
 \, observed interactions between the magnetized windings were studied and 
 tuned by engineering the initially planar nanomembrane shape to stabilize 
 axial movement of windings (Fig. 1c). Finally\, the developed technology w
 as used to assemble 10 mm long nanomembranes into Al2O3 dielectric capacit
 ors (Fig. 1d) having 0.018 mm² footprint and a CV product of 0.5 mFV/cm²
  with 90% overall assembly yield outperforming previous works as well as i
 ndustry’s smallest multilayer ceramic capacitor (MLCC).
DTSTAMP:20260606T052433Z
CREATED:20190502T180321Z
LAST-MODIFIED:20190505T165340Z
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