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Degradation of thin solar-sail membrane films under interplanetary medium

Sznajder, Maciej and Geppert, Ulrich and Marć, Maciej (2017) Degradation of thin solar-sail membrane films under interplanetary medium. In: Proceedings of The Fourth International Symposium on Solar Sailing. The Fourth International Symposium on Solar Sailing, 17-20 January 2017, Kyoto, Japan.

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Official URL: http://www.jsforum.or.jp/ISSS2017/

Abstract

Thin metallized films are used in wide field applications of deployable membrane structures. Flexible and thin polyimide foils are covered by highly reflecting metallic surfaces. Unfortunately metals while interact with the solar wind particles indicate formation of tiny molecular hydrogen bubbles on their surface, i.e. ~0.4 μm in diameter. Such bubbles occur as a consequence of recombination processes of the solar protons and the metals’ electrons. Our aim was to experimentally confirm the formation of the bubbles under simulated conditions which mimic those present in the interplanetary space and find physical conditions, i.e. temperature of the membrane material, dose and kinetic energy of the incident protons at which the bubble formation process takes place. We have studied and select possible materials which may protect the metallized surfaces against the phenomenon. Three protection coatings have been chosen, the silicon- and the titanium- dioxide as well as titanate nanotubes. We have experimentally confirmed that metallic specimens exposed to flux of low energy protons (2.5 keV) indicate formation of tiny bubbles on their surface. High surface density of bubbles has its direct influence on the surface thermo-optical properties, which have a major impact on propulsion efficiency of any sail-craft.

Item URL in elib:https://elib.dlr.de/111051/
Document Type:Conference or Workshop Item (Speech)
Title:Degradation of thin solar-sail membrane films under interplanetary medium
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sznajder, Maciejmaciej.sznajder (at) dlr.deUNSPECIFIED
Geppert, UlrichUlrich.Geppert (at) dlr.deUNSPECIFIED
Marć, Maciejmaciek.marc (at) yahoo.comUNSPECIFIED
Date:20 January 2017
Journal or Publication Title:Proceedings of The Fourth International Symposium on Solar Sailing
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Solar Sailing, Molecular Hydrogen Bubbles
Event Title:The Fourth International Symposium on Solar Sailing
Event Location:Kyoto, Japan
Event Type:international Conference
Event Dates:17-20 January 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Entfaltungstechnologie . Solar Sail (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Sznajder, Dr.-Ing. Maciej
Deposited On:10 Feb 2017 12:28
Last Modified:31 Jul 2019 20:08

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