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nanoHUB-U Fundamentals of AFM L2.3: Tip-Surface Interactions (Contact) - Dejaugin Approximation

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Published on Jun 2, 2014

Table of Contents:
00:09 Lecture 2.3: Connecting Surface Energies to Hamaker Constants ...
01:12 Surface Energetics
01:44 (Excess) Surface Energy
02:43 Recall the Molecule-Plane Interaction
03:41 The Plane-Plane Interaction
05:50 Typical Values for Hamaker Constant
07:22 How strong is the vdW surface force?
12:21 Estimating the surface energy due to vdW forces
13:46 The Derjaguin approximation
16:27 Likewise, it can be shown that for two interacting sphere of different ...
17:29 Example
18:41 Implications of Derjaguin's approximation


This video is part of nanoHUB-U's course Fundamentals of Atomic Force Microscopy: Part 1 Fundamental Aspects of AFM. (https://nanohub.org/courses/AFM1)

Structured as two 5-week courses, this unique set of courses developed by Profs. Ron Reifenberger and Arvind Raman, look at the underlying fundamentals of atomic force microscopy and exposes the knowledge base required to understand how an AFM operates.

The atomic force microscope (AFM) is a key enabler of nanotechnology, and a proper understanding of how this instrument operates requires a broad-based background in many disciplines. Few users of AFM have the opportunity or resources to rapidly acquire the interdisciplinary knowledge that allows an intelligent operation of this instrument. This focused, in-depth course solves this problem by presenting a unified discussion of the fundamentals of atomic force microscopy.

Fundamentals of Atomic Force Microscopy, Part 2: Dynamic AFM Methods provides an in-depth treatment of dynamic mode AFM.

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