ISSN:
1662-0356
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Allgemeine Naturwissenschaft
,
Technik allgemein
Notizen:
This paper presents on a new damping element called the colloidal damper which is used aprinciple of surface extension force in nano pore. The direction acting of the surface extension forceof water in hydrophobic nano pore is different in pressurization and decompressurization processes[1,2]. This principle is applied to a damping element. The nano pore is constructed by silica gel. Asilica gel ball of 100-200 micrometer dia. has many nano pores of 5-20 nanometer dia. in it [3,4].The coated spherical silica gel and water are inserted in a piston - cylinder unit in order to work as adamper. If compression and decompression forces are added to the piston - cylinder unit (damper),water flows into and moves out the nano pore under balance of pressure. A contact angle ofcompression formed by the hydrophobic nano pore and water is larger than that of decompression.This difference of the contact angle produces a damping energy.In this paper, behavior of water in the pore of silica gel is investigated using the moleculardynamics. Dissipation energy of the colloidal damper is concerned with the contact angles of waterin the pore. So the contact angles are calculated for changing parameters, i.e. size of the pore, lengthof the hydrophobic material, velocity (pressure) of water flows into the pore. Then these results arecompared with the experimental ones
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.57.73.pdf
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