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Lateral diffusion of amphiphiles and...

Johnson, Michael James.

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Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface./
作者:	Johnson, Michael James.
面頁冊數:	147 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-02, Section: B, page: 0818.
Contained By:	Dissertation Abstracts International63-02B.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3044519
ISBN:	0493583807

Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface.
Johnson, Michael James.

Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface. - 147 p.

Source: Dissertation Abstracts International, Volume: 63-02, Section: B, page: 0818.

Thesis (Ph.D.)--University of California, Berkeley, 2001.

This thesis presents an investigation of the phase behavior and dynamic properties of monolayers in relation to the molecular structure of their composing amphiphiles. A variety of amphiphiles with different molecular structures were synthesized and investigated. The liquid expanded/gas (LE/G) phase transition was investigated for a set of 4-alkylamido-2,2,6,6-tetramethyl-1-piperidinyloxy amphiphiles (CnTEMPO where n = 14--22). The C20TEMPO and C22TEMPO amphiphiles show the LE/G phase transition upon expansion. This was determined by surface pressure, surface potential, Brewster angle microscopy (BAM), and electrochemical measurements. Fresh line electrodes placed in contact with the monolayer were found to unambiguously determine the state of the monolayer. Freshly prepared electrodes that contact a liquid expanded film exhibit a well-developed cyclic voltammogram. The same electrodes placed in contact with monolayer films in the LE-G coexistence exhibit essentially no faradaic response due to nucleation of the C20--22 TEMPO monolayer gas phase at the electrode surface upon contact. In contrast, it was found that the cohesive interactions within the C14--18 TEMPO amphiphiles were weak.

ISBN: 0493583807Subjects--Topical Terms:

560527
Chemistry, Physical.

Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface.
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245 1 0 $a Lateral diffusion of amphiphiles and monolayer phase behavior at the air/water interface.
300 $a 147 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-02, Section: B, page: 0818.
500 $a Chair: Marcin Majda.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2001.
520 $a This thesis presents an investigation of the phase behavior and dynamic properties of monolayers in relation to the molecular structure of their composing amphiphiles. A variety of amphiphiles with different molecular structures were synthesized and investigated. The liquid expanded/gas (LE/G) phase transition was investigated for a set of 4-alkylamido-2,2,6,6-tetramethyl-1-piperidinyloxy amphiphiles (CnTEMPO where n = 14--22). The C20TEMPO and C22TEMPO amphiphiles show the LE/G phase transition upon expansion. This was determined by surface pressure, surface potential, Brewster angle microscopy (BAM), and electrochemical measurements. Fresh line electrodes placed in contact with the monolayer were found to unambiguously determine the state of the monolayer. Freshly prepared electrodes that contact a liquid expanded film exhibit a well-developed cyclic voltammogram. The same electrodes placed in contact with monolayer films in the LE-G coexistence exhibit essentially no faradaic response due to nucleation of the C20--22 TEMPO monolayer gas phase at the electrode surface upon contact. In contrast, it was found that the cohesive interactions within the C14--18 TEMPO amphiphiles were weak.
520 $a The supercritical state of C14TEMPO was exploited in the electrochemical studies of its lateral mobility at the air/water interface. The supercritical state of this monolayer allows measurements of its lateral diffusion coefficient to be made at very low surface densities (ca. 600 A2/molecule or more). This opened the possibility to probe the viscosity of the water liquid/vapor interfacial region.
520 $a In the course of these studies, a 2D electrochemical time-of-flight (ETOF) method was developed. The reliability of the 2D ETOF was established by investigating the lateral diffusion of C14TEMPO using both 2D voltammetry and 2D ETOF. (Abstract shortened by UMI.)
590 $a School code: 0028.
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792 $a 2001
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