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Atomic Force Microscopy

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy

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Characterization of Surface Patterning on Polymer-Grafted Nanocubes Using Atomic Force Microscopy and Force Volume

Wade Shipley¹, Yufei Wang¹, Joelle Chien²

¹Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92023, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 19, 2024

Summary

Atomic force microscopy revealed unique polymer structures on silver nanocubes. Researchers identified octopus micelles, polymer coronas, and bridging, offering insights into polymer grafting at the nanoscale.

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Area of Science:

Surface science
Polymer chemistry
Nanotechnology

Background:

Atomic force microscopy (AFM) is crucial for studying polymer structures on surfaces.
Low polymer density can lead to diverse morphological structures.
Understanding these structures is key for advanced material applications.

Purpose of the Study:

To characterize the nanoscale surface morphology of polyethylene glycol (PEG) chains grafted onto silver nanocubes (AgNCs).
To investigate the influence of AgNC-substrate and AgNC-AgNC interactions on polymer conformation.

Main Methods:

Utilizing force volume mapping with Atomic Force Microscopy (AFM) on single AgNCs.
Acquiring spatially resolved force-distance curves to map adhesion energy and deformation.
Analyzing structural differences using force curves.

Main Results:

Confirmed the presence of surface octopus micelles localized on AgNC corners.
Resolved structural distinctions between micelle bodies and legs.
Observed a polymer corona due to AgNC-substrate interactions.
Identified polymer bridging resulting from particle-particle interactions.

Conclusions:

Force spectroscopy effectively maps nanoscale polymer structures on AgNCs.
Octopus micelles, polymer coronas, and bridging are key morphological features in this system.
AFM provides detailed insights into polymer behavior at interfaces.