Environmental Sem
Environmental Sem - Related Videos
09:02
SEM Imaging of Biological Samples
0 Views •
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...
11:59
In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
0 Views •
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.
11:41
Scanning Electron Microscopy (SEM)
0 Views •
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...
13:29
Biodistribution of Nano-drug Carriers: Applications of SEM
0 Views •
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...
10:06
Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
0 Views •
Cited by 15 •
2014
This paper presents the methods used for probing spatially correlated chemical, structural, and mechanical properties of the multilayered scale of Atractosteus spatula (A. spatula) using nanoindentation, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray computed tomography (X-ray CT). The experimental results have been used to investigate the design principles of protective biological materials.
FAQs
Differential pumping maintains two apparently conflicting conditions: gas remains around the specimen, while the electron path stays at high vacuum. This pressure separation allows imaging in a controlled gaseous environment rather than requiring the entire microscope path to contain the specimen atmosphere. For engineering studies, that arrangement makes it possible to observe surfaces while environmental exposure is maintained.
In ESEM, gas molecules near the specimen help neutralize surface charge, a key issue when imaging electrically nonconductive materials. The gas also contributes to detectable signals, so the instrument can obtain useful surface information without relying on the same conditions as conventional SEM. This charge-control mechanism expands the range of engineering materials that can be examined.
The specimen can remain in gas while electrons still travel through a high-vacuum path. This separation supports signal generation and image formation without eliminating the controlled atmosphere around the material. Consequently, observations can focus on surface structure and environmental changes under conditions that more closely represent the material’s state during exposure.
Researchers would choose ESEM when the specimen is wet, uncoated, or electrically nonconductive, or when the study focuses on environmental exposure. In engineering, that selection supports investigations of hydration, corrosion, fracture, coatings, polymers, and soils. The method is therefore useful when surface behavior under controlled conditions matters to material characterization rather than simply observing an idealized sample.
A basic engineering examination requires controlling the gaseous environment around the specimen while differential pumping preserves the high-vacuum electron path. The selected material is then examined for surface structure or changes during exposure. This approach is suited to comparisons involving hydration, corrosion, coatings, polymers, soils, and fracture-related features.
ESEM can reveal surface structure and changes that develop during environmental exposure, rather than providing only a static description of a prepared specimen. That information supports material characterization across systems such as coatings, polymers, soils, and corroding or hydrating materials. Engineers can use these observations to strengthen material characterization and design decisions.