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Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles./
作者:	German, Sean R.
面頁冊數:	1 online resource (123 pages)
附註:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
標題:	Chemistry. -
電子資源:	click for full text (PQDT)
ISBN:	9780355390759

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
German, Sean R.

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles. - 1 online resource (123 pages)

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--The University of Utah, 2017.

Includes bibliographical references

This dissertation presents experimental and computational studies of individual nanobubbles electrochemically generated at platinum nanoelectrodes. Chapter 1 provides an overview of the physics governing bubble dynamics and a brief summary of the literature regarding nanobubbles.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355390759Subjects--Topical Terms:

593913
Chemistry.
Index Terms--Genre/Form:

554714
Electronic books.

Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
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245 1 0 $a Lifetime, Critical Nucleus Size, and Laplace Pressure of Individual Electrochemically Generated Nanobubbles.
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300 $a 1 online resource (123 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
500 $a Adviser: Henry S. White.
502 $a Thesis (Ph.D.)--The University of Utah, 2017.
504 $a Includes bibliographical references
520 $a This dissertation presents experimental and computational studies of individual nanobubbles electrochemically generated at platinum nanoelectrodes. Chapter 1 provides an overview of the physics governing bubble dynamics and a brief summary of the literature regarding nanobubbles.
520 $a Chapter 2 describes a fast scan voltammetric method for measurement of nanobubble dissolution rates. After a nanobubble is nucleated from gas generated via an electrode reaction, the electrode potential is rapidly stepped to a value where the bubble is unstable and begins to dissolve. The electrode potential is immediately scanned back to values where the bubble was initially stable. Depending on the rate of this second voltammetric scan, the initial bubble may or may not have time to dissolve. The fastest scan rate at which the bubble dissolves is used to determine the bubble's lifetime. The results indicate that dissolution of a H2 or N2 nanobubble is, in part, limited by the transfer of molecules across the gas/water interface.
520 $a Chapter 3 presents electrochemical measurements of the dissolved gas concentration, at the instant prior to nucleation of a nanobubble of H 2, N2, or O2 at a Pt nanodisk electrode. The results are analyzed using classical thermodynamic relationships to provide an estimate of the size of the critical gas nucleus that grows into a stable bubble. This critical nucleus size is independent of the radius of the Pt nanodisk employed and weakly dependent on the nature of the gas.
520 $a Chapter 4 reports electrochemical measurements of Laplace pressures within single H2 bubbles between 7 and 200 nm radius (corresponding, respectively, to between 200 and 7 atmospheres). The current, associated with H2 gas generation, supporting a steady-state nanobubble is modulated by application of external pressure. The slope of the current-pressure response allows extrapolation of the bubble's curvature-dependent internal pressure. The results demonstrate a linear relationship between a bubble's Laplace pressure and its reciprocal radius, verifying the classical thermodynamic description of H2 nanobubbles as small as ~10 nm.
520 $a Chapter 5 summarizes these results and places them in the context of current research. Future directions for further studies are suggested.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Chemistry. $3 593913
650 4 $a Analytical chemistry. $3 1182118
650 4 $a Nanoscience. $3 632473
655 7 $a Electronic books. $2 local $3 554714
690 $a 0485
690 $a 0486
690 $a 0565
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Utah. $b Chemistry. $3 1186994
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10607877 $z click for full text (PQDT)