Contact dynamics in the adhesion process between spherical polydimethylsiloxane rubber and glass substrate
The contact dynamics between a soft sphere and a rigid substrate on the micron scale was studied experimentally. The time evolution of the contact radius, contact angle, and the force acting on the sphere were measured simultaneously in the loading and the unloading cycle. There is little effect of...
| Publié dans: | Langmuir : the ACS journal of surfaces and colloids. - 1985. - 24(2008), 24 vom: 16. Dez., Seite 14059-65 |
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| Auteur principal: | |
| Autres auteurs: | , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2008
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| Accès à la collection: | Langmuir : the ACS journal of surfaces and colloids |
| Sujets: | Journal Article |
| Résumé: | The contact dynamics between a soft sphere and a rigid substrate on the micron scale was studied experimentally. The time evolution of the contact radius, contact angle, and the force acting on the sphere were measured simultaneously in the loading and the unloading cycle. There is little effect of repetition: the experimental results obtained in the second and third cycles agree completely with those of the first cycle. The contact angle changes dynamically in the loading and the unloading processes, and there are regions where the advancing angle and the receding angle remain constant. The experimental results were analyzed in terms of the extended Johnson-Kendall-Roberts theory, and it was found, to our surprise, that the theory works well: the theory predicts the force curve quite accurately if the apparent surface energy obtained from the contact radius is used. The apparent surface energy was experimentally obtained as a function of the contact line velocity, and it was found that (1) the curve agrees qualitatively with that predicted by Greenwood and Johnson, and (2) certain modification is needed when the velocity of the contact line changes the sign |
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| Description: | Date Completed 01.05.2009 Date Revised 10.04.2009 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la8024155 |