Low Voltage Scanning Electron Microscopy (LVSEM) for Improved Surface Characterization of Ocular Implants and Other Prosthetic Devices

1990 ◽  
pp. 19-22 ◽  
Author(s):  
E. P. Goldberg ◽  
M. Yalon ◽  
W. E. Longo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Characterization ◽  
Low Voltage ◽  
Prosthetic Devices ◽  
Ocular Implants ◽  
Voltage Scanning ◽  
Scanning Electron

Low-Voltage Scanning Electron Microscopy Investigation of Polymers

1988 ◽  
Vol 46 ◽  
pp. 220-221
Author(s):  
V. K. Berry
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Voltage ◽  
Morphological Characterization ◽  
Transmission Electron ◽  
Conducting Materials ◽  
Voltage Scanning ◽  
Scanning Electron

The morphological characterization of any polymer blend plays an important part in the development of a new blend system because the properties of blends are dictated by phase morphology which is dependent upon the chemistry and the processing conditions. Light microscopy, scanning electron microscopy and transmission electron microscopy are the most commonly used microscopical techniques for morphological characterization. Transmission electron microscopy techniques provide the best resolution (≈ 0.3 nm) but are limited in the size of sample area and require elaborate sample preparation procedures. Surface charging and beam damage problems have been some of the drawbacks of conventional scanning electron microscopy with non-conducting materials like polymers.The use of low accelerating voltage scanning electron microscopy (LVSEM) in the characterization of polymers and other non-conducting materials is beginning to be recognized.

Surface morphology characterization of industrial polymers by low-voltage scanning electron microscopy

1991 ◽  
Vol 49 ◽  
pp. 1036-1037
Author(s):  
V. K. Berry
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Voltage ◽  
Collection Efficiency ◽  
Steady Increase ◽  
Brightness Field ◽  
Morphology Characterization ◽  
Voltage Scanning ◽  
Scanning Electron

There has been an increase in awareness in low voltage scanning electron microscopy (LVSEM) of polymers in recent years because not only is it possible to use uncoated or very lightly coated (1-5nm) polymer samples but also due to an inherent advantage of limited beam damage of polymer samples by low energy beams. A steady increase in the use of low accelerating voltages for characterizing polymers has been made possible due to some major developments, such as high brightness field emission source, better lens and column design to minimize lens aberrations, and newer and improved detector systems with higher collection efficiency, incorporated by instrument manufacturers in their newer commercial models in recent years. Although there is still room for further improvements, the described instrumental changes have made possible the appreciation of LVSEM in characterization of polymers and non-conducting, beam sensitive materials.

Low-Voltage Scanning Electron Microscopy in polymer characterization

1987 ◽  
Vol 45 ◽  
pp. 468-469 ◽  
Author(s):  
V. K. Berry
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Voltage ◽  
Polymer Surfaces ◽  
Conducting Materials ◽  
Theoretical Considerations ◽  
Voltage Scanning ◽  
Beam Damage ◽  
Scanning Electron

The application of low voltage scanning electron microscopy (LVSEM) to the characterization of polymers and non-conducting materials, other than semiconductors, has not been well explored yet. Some of the theoretical considerations and practical limitations which prevented the development of commercial instruments have mostly been addressed with the result that machines are now available which are optimized for low voltage (≥ 0.5 kV) operation. The advantages of working at low voltages are beginning to be recognized outside the semi-conductor industry. When we image uncoated polymer surfaces at low beam energies (0.5-1.5 kV), no beam damage or charging artifacts are experienced, because in this region the emitted electrons are equal to or more than the incident electrons and there is no deposition of charge underneath the surface due to the lower penetration of the incident electrons.

Novel Approaches to Low-Voltage Scanning Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 366-367
Author(s):  
Arthur V. Jones
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Voltage ◽  
Electron Optics ◽  
Current Interest ◽  
New Concepts ◽  
Opportune Time ◽  
Novel Approaches ◽  
Voltage Scanning ◽  
Scanning Electron

In comparison with the developers of other forms of instrumentation, scanning electron microscope manufacturers are among the most conservative of people. New concepts usually must wait many years before being exploited commercially. The field emission gun, developed by Albert Crewe and his coworkers in 1968 is only now becoming widely available in commercial instruments, while the innovative lens designs of Mulvey are still waiting to be commercially exploited. The associated electronics is still in general based on operating procedures which have changed little since the original microscopes of Oatley and his co-workers.The current interest in low-voltage scanning electron microscopy will, if sub-nanometer resolution is to be obtained in a useable instrument, lead to fundamental changes in the design of the electron optics. Perhaps this is an opportune time to consider other fundamental changes in scanning electron microscopy instrumentation.

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