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Scanning Electron Microscopy01:07

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
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Melamine-Formaldehyde Microcapsules: Micro- and Nanostructural Characterization with Electron Microscopy.

Hamed Heidari1, Guadalupe Rivero2, Hosni Idrissi1

  • 11Electron Microscopy for Materials Science (EMAT),University of Antwerp,Groenenborgerlaan 171,2020 Antwerp,Belgium.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|December 22, 2016
PubMed
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Melamine-formaldehyde microcapsules show enhanced mechanical properties and surface porosity, improving epoxy matrix binding for advanced material applications.

Keywords:
EELSelectron tomographyin situ mechanical TEMmelamine formaldehydetransmission electron microscopy

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Melamine-formaldehyde (MF) microcapsules are utilized in various composite materials.
  • Understanding their surface morphology and mechanical properties is crucial for optimizing performance.

Purpose of the Study:

  • To systematically compare MF microcapsules (5-30 μm) with varying core content.
  • To investigate surface morphology, shell thickness, mechanical properties, and binding behavior.

Main Methods:

  • Scanning and transmission electron microscopy (including electron tomography)
  • In situ nanomechanical tensile testing
  • Electron energy-loss spectroscopy

Main Results:

  • MF microcapsule shells exhibit surface porosities but not inner ones.
  • Shells demonstrate higher Young's modulus and fracture strain than bulk MF.
  • Epoxy matrix uniformly penetrates surface porosities during curing.

Conclusions:

  • MF microcapsule shells possess superior mechanical characteristics compared to bulk material.
  • Surface porosities enhance microcapsule-matrix binding in epoxy composites.