MCR Scanning Electron Microscopy Laboratory Portfolio
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1 SUNY College of Environmental Science and Forestry Digital ESF N.C. Brown Center for Ultrastructure Studies Fall 2016 MCR Scanning Electron Microscopy Laboratory Portfolio Timothy Gervascio SUNY - College of Environmental Science and Forestry Follow this and additional works at: Part of the Nanoscience and Nanotechnology Commons, Structural Biology Commons, and the Structural Materials Commons Recommended Citation Gervascio, Timothy, "MCR Scanning Electron Microscopy Laboratory Portfolio" (2016). N.C. Brown Center for Ultrastructure Studies This Presentation is brought to you for free and open access by Digital ESF. It has been accepted for inclusion in N.C. Brown Center for Ultrastructure Studies by an authorized administrator of Digital ESF. For more information, please contact digitalcommons@esf.edu.
2 Scanning Electron Microscopy Laboratory Portfolio Timothy Gervascio Fall 2016 Submitted for MCR 484/783 Scanning Electron Microscopy Fall 2016 N.C. Brown Center for Ultrastructure Studies
3 These images were prepared as part of the class MCR 484 Scanning Electron Microscopy at SUNY College of Environmental Science and Forestry, Fall 2016, All images were acquired on the JEOL JSM 5800 LV Scanning Electron Microscope in the N. C. Brown Center for Ultrastructure Studies 2
4 Tim Gervascio Major: Conservation Biology Career Goals: Biological research. The images found in this collection are examples of the knowledge and skills I have developed through the MCR 484 Scanning Electron Microscopy course taken in the fall 0f I took this course because I have always had an interest in microscopes, and this was a good opportunity to learn about and use a new type of microscope. 3
5 Table of Contents I images I am presenting in this collection were chosen because they exemplify the knowledge and skills I have developed along with the care, quality, and concern for the work I produce. Description 1.My Best Work 2.The Hardest 3.My Favorite 4.Images from lab exercises 4
6 Figure 1: My Best Image I chose this as my best image because it shows fine surface detail and macro-scale structures at the same time. I was also able to capture a large depth of field while working within the limitations of an uncoated biological sample and a low accelerating voltage. 5
7 Figure 1. My Best Image: An uncoated arthropod antennae imaged at 1kV produced a clear image with enough signal and very little edge effect even on the thin hair-like projections. Spot size 12, Working Distance 9mm, Objective aperture 2. 6
8 Figure 2: The Hardest Image to Capture This was the hardest image to capture because of the 100,000x magnification. Getting the best image required careful adjustment of the spot size and plane of focus. 7
9 Figure 2. Hardest Image to Capture: Scanning electron micrograph of structural detail on a sputter coated gastropod shell. 25kV accelerating voltage, 9mm working distance, objective aperture 1, spot size 10. 8
10 Figure 3: My Favorite Image This is my favorite image because of its artistic value, and the surprisingly high quality of the image given the sample preparation. All of the foreground is in clear focus and the charging is surprisingly limited at 15kV considering the sample is uncoated and biological. Artistically, I like the piece of lichen in the background hanging out off the edge in contrast to the dark background. 9
11 Figure 3. Favorite Image: Secondary electron image of uncoated lichen. 15kV accelerating voltage, 19mm working distance, spot size 6, 1600x magnification. 10
12 Additional Examples of My Work The following images are additional examples of my work I have included because it is another one of my favorite images. It shows a lot of topographical information and has artistic value. 11
13 Figure 4. Scanning electron micrograph of the top surface of a leaf. Sample was critical point dried and sputter coated. Critical point drying preserves the cellular structure and the distinctiveness of each cell. Spot Size 10, Working Distance 19mm, 15kV accelerating voltage, micron bar is 10 micrometers. 12
14 Images from Labs 1-10 A portfolio of micrographs from lab sessions demonstrating the following techniques: 1.Secondary Electron Image and Probe diameter (spot size) a. Spot size 8 b. Spot size 20 c. Spot size 11 2.Specimen Preparation - Sputter Coating 3.Specimen Preparation - Critical Point Drying 4.Image Quality II -Depth of Field a. short WD, large aperture b. long WD, small aperture 5.Image Quality I -Accelerating Voltage a. 20 kv b. low kv 6.Backscattered Electron Imaging a. SEI image b. BEI image 7.Low voltage (< 2kV) of uncoated biological sample 8.High Magnification 9.Digital Imaging with Photoshop 10.Stereo Pair 13
15 Figure 1a. Secondary electron image of debris on sputter coated gastropod shell. Spot Size 8 (small), 19mm working distance, 15kV accelerating voltage, 1900x magnification. 14
16 Figure 1b. Secondary electron image of debris on sputter coated gastropod shell. Spot Size 20 (large), 19mm working distance, 15kV accelerating voltage, 1900x magnification. 15
17 Figure 1c. Secondary electron image of debris on sputter coated mollusk shell. Spot Size 11 (medium), 19mm working distance, 15kV accelerating voltage, 1900x magnification.
18 Figure 2. SEM micrograph of sputter coated lichen. Spot Size 8, Working Distance 19mm, 15kV accelerating voltage, 6000x magnification. 17
19 Figure 3. Scanning electron micrograph of the top surface of a leaf. Sample was critical point dried and sputter coated. Critical point drying preserves the cellular structure and the distinctiveness of each cell. Spot Size 10, Working Distance 19mm, 15kV accelerating voltage, micron bar is 10 micrometers. 18
20 Figure 4a. SEM micrograph of an angled TEM grid to demonstrate depth of field. A larger objective aperture and a short working distance yields the worst depth of field. The center of the image is in focus, but the edges are far out of focus. Working distance 12mm, Objective Aperture 2, Spot Size 16, 10kV accelerating voltage. 19
21 Figure 4b. SEM micrograph of an angled TEM grid to demonstrate depth of field. Objective aperture was set to the smallest size and working distance was set to a longer distance. This setup gives the best depth of field, both the center of the image and the edges are in focus, but some signal is sacrificed. Working distance 28mm, Objective Aperture 1, Spot Size 16, 10kV accelerating voltage. 20
22 A B Figure 5. Scanning electron micrographs of conductive watch movement components to illustrate the effects of accelerating voltage on image quality. A) Accelerating voltage of 25kV allowed for the magnification to be increased greatly and demonstrates the resolving power of electron microscopy. Spot size 10, 21mm working distance, objective aperture 1. B) Lower accelerating voltage of 10kV shows the surface detail of a scar on the metal surface without the image being too hot and reducing edge effects. 21mm working distance, objective aperture 1, spot size 10. A long working distance and small aperture give good depth of field in both images. 21
23 A B Figure 6. Three TEM grids, one gold and two copper, overlapped to show atomic number contrast in a backscatter electron image (BEI). A) Secondary electron image of the three grids showing the immediate surface details of the sample. B) Backscatter electron image of the same TEM grids showing atomic number contrast and revealing information from deeper in the sample's surface. 20kV accelerating voltage, Objective aperture 2, spot size 16, working distance 14mm. 22
24 A B Figure 7. Scanning electron micrographs of uncoated biological samples to illustrate the impact of accelerating voltage on image quality. A) An accelerating voltage of 0.7kV was enough to cause some mild charging effects on this tiger whisker, and some graininess was apparent due to the reduced signal relative to the noise in the chamber. Spot size 12, Working Distance 11mm, Objective Aperture 2. B) An uncoated arthropod antennae imaged at 1kV produced a clear image with enough signal and very little edge effect even on the thin hair-like projections. Spot size 12, Working Distance 9mm, Objective aperture 2. 23
25 Figure 8. Scanning electron micrograph of structural detail on a sputter coated gastropod shell. 25kV accelerating voltage, 9mm working distance, objective aperture 1, spot size
26 A B Figure 9. Scanning electron micrographs of structural detail on a sputter coated gastropod shell a) before image processing and b)after image processing. The brightness and contrast was edited to make full use of the range of greyscale values according to the histogram. Additionally, the Unsharp Mask filter was applied to image b. Scale bar = 100nm. 25kV accelerating voltage, 9mm working distance, objective aperture 1, spot size
27 Figure 10. Red/green stereo from a scanning electron micrograph of an uncoated geode. Images were processed in photoshop and merged to produce the stereo pair. Both micrographs produced at 15kV accelerating voltage, objective aperture 1, spot size 11, working distance 36mm, 1300x magnification, scale bar represents 10 microns. 26
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