Electrostatic Confinement, Patterning, and Manipulation of Charged Nanoparticles by Combining Nanostructured Surfaces and Ionic Charge Regulation.

particle confinement;Engineering;Macromolecular Science and Engineering

Panday, AshwinKurabayashi, Katsuo ;

University of Michigan

关键词: particle confinement;    Engineering;    Macromolecular Science and Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/120879/ashwinp_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Electrostatic forces are amongst the most versatile when applied to mediate the interactions between nanostructured interfaces. Depending on the experimental conditions, these forces can be either attractive or repulsive, and their directionality can be controlled dynamically. In this dissertation, we employ these forces to confine and manipulate charged nanoparticles using nanostructured interfaces. The various methodologies discussed herein inform and complement each other while opening pathways for diversified applications.Electrostatic confinement of nanoscale species in solution has far-reaching effects in fields as diverse as biophysics, gene therapy, single-particle motion monitoring studies and bottom-up fabrication of nanostructures. We present a methodology to uniaxially confine charged nanoparticles on one-dimensional electrodes without the usage of geometrical barriers. An actively-tunable, engineered model system for electrostatic binding interactions is demonstrated and interaction characteristics are discussed in relation to mimicking the natural biological interaction between charged species. We further investigate the electrostatic interactions between nanoparticles and patterned sinusoidal-void structures. A size-selective nanoparticle confinement and patterning technique is demonstrated. In addition, ionic charge regulation in the electrical double layer, its ramifications and its applications are discussed. In many particle-fractionation applications, complementary geometries are critical for understanding confinement characteristics and so a novel methodology is introduced to detect and visualize relative size variations in pre-characterized nanoparticle ensembles. This capped particle optical-sizing methodology is easily accessible, has high-throughput, and is relatively facile when compared to existing size-characterization techniques. Finally, a nanoparticle-manipulation-based transparent display concept is demonstrated that has been supplemented by our enhanced understanding of the above mentioned confinement methodologies of electrostatically confining charged nanoparticles in solution.