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Atomic Force Microscopy01:08

Atomic Force Microscopy

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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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Atomic Orbitals02:44

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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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The Energies of Atomic Orbitals03:21

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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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Intermolecular vs Intramolecular Forces03:00

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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Atomic Structure01:33

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Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope

Published on: February 28, 2019

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WiFi-controlled portable atomic force microscope.

Yingda Wang1, Qingyang You1, Ziyao Zhang1

  • 1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, People's Republic of China.

Microscopy Research and Technique
|May 24, 2019
PubMed
Summary
This summary is machine-generated.

A novel WiFi-controlled portable atomic force microscope (AFM) was developed, offering wireless scanning and imaging up to 50m away. This compact AFM provides nanometer resolution without traditional power supplies, enabling versatile applications in remote research settings.

Keywords:
DC pocket-size power supplyWiFi-controlledportable AFMraspberry pi

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Area of Science:

  • Nanotechnology
  • Instrumentation
  • Surface Science

Background:

  • Conventional atomic force microscopes (AFMs) often require bulky power supplies and wired connections, limiting their portability and field application.
  • Developing portable and wireless microscopy solutions is crucial for expanding research capabilities in diverse environments.

Purpose of the Study:

  • To develop a portable atomic force microscope (AFM) controlled wirelessly via WiFi.
  • To enable remote AFM scanning and imaging without tethering to a fixed power source or computer.

Main Methods:

  • The system integrates a horizontal probe, controlling circuits, D/A and A/D interfaces, and a Raspberry Pi (RPi) microcomputer.
  • A pocket-size power supply powers the system, with the RPi creating network hotspots for wireless control.
  • Experiments were conducted in constant height and constant force modes at distances up to 50m.

Main Results:

  • The WiFi-controlled AFM achieved a maximum scan range of 3.6 × 3.6 μm² with nanometer-order resolution.
  • The system demonstrated satisfactory image contrast, stability, and repeatability.
  • Successful wireless AFM scanning and imaging were performed at distances of 50m and beyond.

Conclusions:

  • The developed WiFi-controlled portable AFM offers a viable alternative to conventional systems, eliminating the need for mains power or high-voltage supplies.
  • Its portability and wireless capabilities open new avenues for AFM applications in isolated environments, outdoor research, and fieldwork.
  • This technology enhances the accessibility and flexibility of atomic force microscopy for scientific investigation.