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Related Experiment Video

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Controlled heating and alignment platform enhances versatility in colloidal probe fabrication.

Russell C Schmitz1, Christopher J Wohl2, Pacita I Tiemsin2

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

The Review of Scientific Instruments
|February 5, 2020
PubMed
Summary
This summary is machine-generated.

A new Controlled Heating and Alignment Platform (CHAP) enables precise fabrication of colloidal probes using atomic force microscopy. This method preserves particle integrity, expanding applications for force measurements.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Colloidal probes are essential for measuring surface interactions using atomic force microscopy (AFM).
  • Traditional fabrication methods can damage or alter particles, limiting their use.

Purpose of the Study:

  • To introduce a novel fabrication platform, the Controlled Heating and Alignment Platform (CHAP), for creating colloidal probes.
  • To demonstrate that CHAP preserves the original characteristics of attached colloidal particles during fabrication.

Main Methods:

  • The CHAP utilizes direct heating of the AFM chip for precise temperature control.
  • 3D-printed components enhance compatibility with optical microscopes and streamline fabrication.
  • Thermoplastic wax adhesive and various particle sizes (0.7–40 μm) were used in a case study.

Main Results:

  • CHAP minimizes particle heating and prevents adhesive contamination.
  • Fabrication process is streamlined and versatile.
  • Completed probes retained particle features, and pull-off tests confirmed firm attachment and accurate force measurements.

Conclusions:

  • The Controlled Heating and Alignment Platform (CHAP) offers a reliable method for fabricating high-quality colloidal probes.
  • This technique overcomes limitations of previous methods, enabling broader applications in force spectroscopy.
  • CHAP ensures particle integrity, crucial for accurate and reproducible interaction force measurements.