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Putting a Sphere on an Atomic Force Microscope Cantilever Tip
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zauscher, Stefan |
| Copyright Year | 1997 |
| Abstract | Atomic Force Microscopes (AFM) can measure the force between a surface and the tip of a cantilever as a junction of separation with great precision. For example, van der Waals type forces and electrostatic repulsive forces can easily be measured in aqueous solutions using an AFM. The complex, pyramidal shape of the typical AFM cantilever is, however, not well suited for quantitative measurements. It is thus desirable to attach particles of known geometry (usually spheres) to the tip of a cantilever. This technique, pioneered by Ducker ef at. in 1992, has led to a number of investigations where particle modified cantilevers were used (for example, refs. 2-4), and has led to the publication of a support note addressing the procedure of how to attach particles to cantilevers. The adhesive of choice seems to be an epoxy resin solid (Epon 1004) manufactured by Shell, Epon 1004 is used as a hot melt adhesive and requires heating the cantilevers on a hotstage. This can lead to warping of (especially metal coated) cantilevers. In my work, I also need to attach spherical particles (cellulose beads) onto standard silicone nitride AFM cantilevers, but I need to avoid excessive heat. I found that an optical adhesive which cures in seconds when exposed to ultraviolet light, and thus does not need heat treatment for crosslinking, works very well. Norland's optical adhesive #81 (NOA #81) is designed for bonding applications where low strain, optical clarity and low outgassing are required. NOA #81 has a viscosity of 300 cp at 25°C, which allows dispensing the adhesive from a micro-pipette with a tip diameter of less than 0.2 [i |
| Starting Page | 6 |
| Ending Page | 6 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1017/s155192950006065x |
| Volume Number | 5 |
| Alternate Webpage(s) | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1551929500060661 |
| Alternate Webpage(s) | https://doi.org/10.1017/s155192950006065x |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
