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Ultrasonic Nanocrystal Surface Modification Produced Surface Texture and Its Applications

Liang, Yuan
http://rave.ohiolink.edu/etdc/view?acc_num=akron1510277965591045

Abstract Details

, Master of Science in Engineering, University of Akron, Engineering.
In this thesis, we have first shown that Ultrasonic Nanocrystal Surface Modification (UNSM) can improve the mechanical properties of Ti-based biomaterials, and produce surface texture with hierarchical micro/nanoscale patterns due to its high controllability. After UNSM-treatment the surface texture of Ti-based biomaterial consists of a major microscale structure with widths ranging from 4 µm to 200 µm, and an embedded nanoscale structure with widths as small as 120 nm. With a customized cylinder tip, the average surface roughness (Ra) can be reduced to 0.03 µm, comparable to the superfinishing surface. The embedded nanoscale structure originates from the formation of the pile-up, which is determined by the elastic-plastic property of materials. Secondly, it is well known that mechanical force can crucially affect form and function of living cells, and play critical roles in many diseases. While techniques to conveniently apply mechanical force to cells are limited, we invent a cell actuator prototype by imparting severe plastic deformation into the surface of shape memory alloy (SMA). Using UNSM, micro surface patterns can be generated on the metal surface so that the micro-size cell can conform to the pattern; meanwhile, phase transformation is induced in the subsurface due to the severe plastic deformation, enabling the control of phase transformation and local deformation using external temperature. When cells are cultured on the UNSM-treated surface, such surface can deform cyclically under external temperature, and therefore apply mechanical force to cells. Finally, hierarchical patterns enable new functions for the treated surface. It is demonstrated that light dispersion and the alteration of wettability can be achieved by controlling surface patterns using UNSM. Through a systematic study, we demonstrate that the capacity of improving mechanical properties, biocompatibility, and hydrophobicity simultaneously, in conjunction with its low-cost and easy-to-operate features, makes UNSM a promising surface engineering technique for biomaterial treatment.
Yalin Dong, Dr. (Advisor)
Chang Ye, Dr. (Advisor)
Guo-Xiang Wang, Dr. (Committee Member)
Materials Science

Recommended Citations

Citations

  • Liang, Y. (n.d.). Ultrasonic Nanocrystal Surface Modification Produced Surface Texture and Its Applications [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510277965591045

    APA Style (7th edition)

  • Liang, Yuan. Ultrasonic Nanocrystal Surface Modification Produced Surface Texture and Its Applications. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1510277965591045.

    MLA Style (8th edition)

  • Liang, Yuan. "Ultrasonic Nanocrystal Surface Modification Produced Surface Texture and Its Applications." Master's thesis, University of Akron. Accessed APRIL 26, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510277965591045

    Chicago Manual of Style (17th edition)

akron1510277965591045
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This open access ETD is published by University of Akron and OhioLINK.