Sem Imaging
Sem Imaging - Related Videos
09:02
SEM Imaging of Biological Samples
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2023
Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut A scanning electron microscope (SEM) is an instrument that uses an electron beam to nondestructively image and characterize conductive materials in a vacuum. As an analogy, an electron beam is to the SEM as light is to the optical microscope. The difference is that the electron microscope yields images of much higher resolution and magnification. The...
11:41
Scanning Electron Microscopy (SEM)
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2023
Source: Laboratory of Dr. Andrew J. Steckl — University of Cincinnati A scanning electron microscope, or SEM, is a powerful microscope that uses electrons to form an image. It allows for imaging of conductive samples at magnifications that cannot be achieved using traditional microscopes. Modern light microscopes can achieve a magnification of ~1,000X, while typical SEM can reach magnifications of more than 30,000X. Because the SEM doesn’t use light to create images, the resulting pictures it...
11:59
In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
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Cited by 5 •
2017
We present a procedure for real-time imaging and elemental composition analysis of boehmite particles in deionized water by in situ liquid Scanning Electron Microscopy.
13:29
Biodistribution of Nano-drug Carriers: Applications of SEM
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2023
Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut Nanoparticles have been increasingly used research towards targeted drug delivery and controlled drug release. While most of these particles have been developed as polymeric or liposomal particles because of their biocompatibility, there is a trend in current research toward the use of metallic and magnetic nanoparticles. These metallic nanoparticles...
10:57
Scanning Electron Microscopy (SEM) Protocols for Problematic Plant, Oomycete, and Fungal Samples
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Cited by 19 •
2017
Problems in the processing of biological samples for scanning electron microscopy observation include cell collapse, treatment of samples from wet microenvironments and cell destruction. Low-cost and relatively rapid protocols suited for preparing challenging samples such as floral meristems, oomycete cysts, and fungi (Agaricales) are compiled and detailed here.
FAQs
Image contrast in SEM imaging comes from interactions between the focused electron beam and the specimen. These interactions generate signals that are converted into image patterns, allowing researchers to examine surface topography and obtain information about composition. Differences in the resulting image can therefore indicate changes in surface structure or material characteristics, rather than differences in visible color.
The electron beam operates in a vacuum, so biological specimens generally require preparation before imaging. Fixation, dehydration, and drying help condition the sample, while coating with a conductive material completes the preparation described for biological SEM work. These steps allow cells, tissues, microorganisms, and biomaterials to be examined under the instrument’s operating conditions.
Compared with conventional light microscopy, SEM imaging provides a more detailed view of specimen surfaces and can reveal structures that are too small for ordinary light microscopy. Its output emphasizes surface topography and composition, making it especially useful when researchers need to connect fine external architecture with cellular, tissue, microbial, or biomaterial characteristics.
A typical biological SEM workflow begins by fixing the specimen, followed by dehydration and drying. The prepared sample is then coated with a conductive material before it is placed in the microscope’s vacuum for imaging. This sequence is important because biological samples must be conditioned for electron-beam examination while retaining the surface features being investigated.
SEM imaging can be applied to cells, tissues, microorganisms, and biomaterials. Researchers use it to inspect cell morphology, tissue organization, microbial surfaces, and the external architecture of engineered materials. The method is most informative when the research question concerns fine surface structure, topography, or composition and how those features relate to biological function.
By documenting detailed surface morphology and tissue organization, SEM imaging helps researchers compare structural features with biological function. It can also reveal surface changes associated with disease-related conditions. In biomaterials research, the same structural information supports examination of material surfaces in a biological context, linking observed architecture with the behavior or role being studied.