• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 484
  • 79
  • 74
  • 39
  • 30
  • 20
  • 18
  • 18
  • 12
  • 3
  • 3
  • 3
  • 2
  • 1
  • 1
  • Tagged with
  • 960
  • 960
  • 820
  • 179
  • 142
  • 132
  • 130
  • 119
  • 97
  • 92
  • 91
  • 90
  • 84
  • 76
  • 72
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

An AFM study of calcite dissolution in water and selected amino acids

Zhao, Yong 12 1900 (has links)
No description available.
22

Design, Fabrication and Validation of a CMOS-MEMS Kelvin Probe Force Microscope

Lee, Geoffrey 06 November 2014 (has links)
The Kelvin Probe Force Microscope is a type of scanning probe instrument that is used to discern the different work functions of a sample. A sharp probe at the end of a cantilever is lowered onto a substrate where electrostatic forces, caused by the difference in work function cause the cantilever to oscillate at the modulated frequency. Using this instrument, high resolution images can be obtained, mapping the surface electronic characteristics. However, developments of this instrument have generally been limited to obtaining higher resolution images as well as reducing noise in the output, limiting the widespread appeal of this expensive instrument. There exist many applications where extremely cheap, low footprint and easy-to-use Kelvin Probe Force Microscopes would be beneficial. In order to cheaply produce this microscope in batch, a post-processed CMOS-MEMS device is utilized. The polysilicon resistors act as a strain gauge such that a conventional optical system will not have to be employed. The ability to use integrated bimorph actuators on chip allow for movement of the cantilever without the employment of large piezoelectric stages with creep effects. Embedded electronics can be fabricated with the CMOS process alongside the MEMS device, allowing full integration of an on board amplifier and read out system. In general, a large table top system can be minimized onto the size of a <1 mm2 area, a microcontroller and a computer. In this work, a Kelvin Probe Force Microscope is designed, fabricated and validated. A MEMS device was designed following similar characteristics of a generic cantilever beam. The stiffness, length, resonant frequency, and other tip characteristics can be mimicked with careful design. The resultant designs were fabricated using a CMOS-MEMS process. In order to obtain a sharper tip with modified characteristics, various methods were employed; such as gallium-aluminum alloy tip formation as well as electroless plating onto the tip of the device. Finally, the resultant device is tested against a sample. It was seen that the MEMS device followed similar characteristics of the conventional microscope itself, validating the equations that define the method. Bimorph actuators were tested to show movement, allowing the integration of the cantilever with the XYZ-stage. Work function changes are observed while scanning different materials. It is shown throughout the course of this thesis, that a true Kelvin Probe Force Microscope can be designed, fabricated and validated using CMOS-MEMS technology.
23

Investigating the effect of dyeing on the surface of wool fibres with atomic force microscopy (AFM) /

Abduallah, Bbduelmaged January 2006 (has links)
Thesis (MSc)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.
24

Force sensing integrated tip and active readout structures with improved dynamics and detection range

Van Gorp, Byron Everrett. January 2007 (has links)
Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2007. / Committee Chair: Degertekin, Levent; Committee Co-Chair: Whiteman, Wayne; Committee Member: Hesketh, Peter.
25

Sensing and manipulation in a nano-bio environment using atomic force microscopy based robotic system

Li, Guangyong. January 2006 (has links)
Thesis (Ph. D.)--Michigan State University. Dept. of Electrical and Computer Engineering, 2006. / Title from PDF t.p. (viewed on Nov. 17, 2008) Includes bibliographical references (p. 172-181). Also issued in print.
26

Atomic force microscope conductivity measurements of single ferritin molecules /

Xu, Degao, January 2004 (has links) (PDF)
Thesis (Ph. D.)--Brigham Young University. Dept. of Physics and Astronomy, 2004. / Includes bibliographical references (p. 71-75).
27

Adhesion of nano-objects to chemically modified surfaces

Barker, Kane McKinney. January 2009 (has links)
Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2010. / Committee Chair: Lawrence A. Bottomley; Committee Member: Aldo A. Ferri; Committee Member: Andrew Lyon; Committee Member: Jean-Luc Bredas; Committee Member: Robert L. Whetten. Part of the SMARTech Electronic Thesis and Dissertation Collection.
28

Nano-bridge testing method for mechanical characterization of individual nanotubes and nanowires /

Wang, Yong. January 2005 (has links)
Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 113-116). Also available in electronic version.
29

Physical properties of grafted polymer monolayers studied by scanning force microscopy morphology, friction, elasticity /

Koutsos, Vasileios. January 1997 (has links)
Proefschrift Rijksuniversiteit Groningen. / Datum laatste controle: 23-10-1997. Lit.opg. - Met een samenvatting in het Nederlands.
30

Concepts of interactions in local probe microscopy

Kerssemakers, Jacob Willem Jozef. January 1997 (has links)
Proefschrift Rijksuniversiteit Groningen. / Datum laatste controle: 22-12-1997. Met bibliogr., lit. opg. - Met samenvatting in het Nederlands.

Page generated in 0.0651 seconds