P
Paul K. Hansma
Researcher at University of California, Santa Barbara
Publications - 405
Citations - 38206
Paul K. Hansma is an academic researcher from University of California, Santa Barbara. The author has contributed to research in topics: Microscope & Conductive atomic force microscopy. The author has an hindex of 99, co-authored 401 publications receiving 36941 citations. Previous affiliations of Paul K. Hansma include Life Technologies & University of California.
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A nondestructive method for determining the spring constant of cantilevers for scanning force microscopy
TL;DR: The spring constant of microfabricated cantilevers used in scanning force microscopy (SFM) can be determined by measuring their resonant frequencies before and after adding small end masses as mentioned in this paper.
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Molecular mechanistic origin of the toughness of natural adhesives, fibres and composites
Bettye L. Smith,Tilman E. Schäffer,Mario B. Viani,James B. Thompson,Neil A. Frederick,Johannes H. Kindt,Angela M. Belcher,Galen D. Stucky,Daniel E. Morse,Paul K. Hansma +9 more
TL;DR: In this article, the authors used the atomic force microscope to stretch the organic molecules exposed on the surface of freshly cleaved nacre and found that the elongation events occur for forces of a few hundred piconewtons, which are smaller than the forces of over a nanonewton required to break the polymer backbone in the threads.
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Control of crystal phase switching and orientation by soluble mollusc-shell proteins
TL;DR: In this paper, the authors showed that soluble polyanionic proteins alone are sufficient to control the crystal phase of calcite and calcite without the need for deposition of an intervening protein sheet.
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Imaging crystals, polymers, and processes in water with the atomic force microscope.
Barney Drake,Craig Prater,A. L. Weisenhorn,Scot A. C. Gould,T. R. Albrecht,Calvin F. Quate,David S. Cannell,Helen G. Hansma,Paul K. Hansma +8 more
TL;DR: Images of mica demonstrate that atomic resolution is possible on rigid materials, thus opening the possibility of atomic-scale corrosion experiments on nonconductors and showing the potential of the AFM for revealing the structure of molecules important in biology and medicine.
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Tapping mode atomic force microscopy in liquids
Paul K. Hansma,Jason Cleveland,Manfred Radmacher,D. A. Walters,P. E. Hillner,Magdalena Bezanilla,Monika Fritz,D. Vie,Helen G. Hansma,Craig Prater,J. Massie,L. Fukunaga,J. Gurley,V. Elings +13 more
TL;DR: Tapping mode atomic force microscopy in liquids gives a substantial improvement in imaging quality and stability over standard contact mode as discussed by the authors, where probe sample separation is modulated as the probe scans over the sample.