Micro-patterned polymeric surfaces as directional and selective adhesives
Abstract/Contents
- Abstract
- Nature has recently become a great source of inspiration for researchers in the fields of adhesion and adhesives. A number of biological specimen have inspired impressive advancements as evolution has produced interesting solutions to the problems researchers are looking to solve. This work focuses on a particular type of adhesive, the manufacturing methods used to produce it, and the viability of such adhesives in standard and radiological environments. A novel type of micro-structure based adhesive, the selective adhesive, is introduced. This adhesive utilizes polymer micro-structures to selectively adhere to particles within a desired size range. Two iterations of the micro-structure design are presented and the performance of these adhesives is described. The second generation of the adhesive proves to be effective at sorting large numbers of particles based on their size in a passive manner, without the requirement of gravity or electrical input energy common to other particle sorting methods used in industrial or laboratory settings. Previous production methods used to manufacture the adhesive micro-structures have proven to have a number of limitations that would make the production of the desired micro-structure geometry difficult. To address this, a novel manufacturing method has been presented. This method, called micro-wedge machining, allows for significantly improved control over a number of micro-structure parameters. This improved control has allowed for the production of not only better selective adhesives, but also directional adhesives used for climbing applications, allowing for an improvement in maximum normal adhesion of approximately 100% over adhesives produced via older manufacturing methods. The biologically inspired adhesives discussed previously could foreseeably be used in a large number of environments. In most cases, the polymers that make up the adhesives can be assumed to be mechanically and chemically stable for the usable lifetime of the adhesive. However, this is not the case for a small number of environments. In the case of nuclear facilities or space applications, ionizing radiation fields can be present and have the capability to cause significant changes in the bulk polymer making up the adhesives. Because these effects can be significant, the effects of gamma and alpha radiation on the adhesives has been investigated. The adhesives prove to be quite robust, maintaining their performance out to very high absorbed radiation doses.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2012 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Day, Paul Samuel |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering |
| Primary advisor | Cutkosky, Mark R |
| Thesis advisor | Cutkosky, Mark R |
| Thesis advisor | Kenny, Thomas William |
| Thesis advisor | Prinz, F. B |
| Advisor | Kenny, Thomas William |
| Advisor | Prinz, F. B |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Paul Day. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2012. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2012 by Paul Samuel Day
Also listed in
Loading usage metrics...