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Investigating the kinetic stability ...

Tylinski, Michael Tod.

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Investigating the kinetic stability and transformation of vapor-deposited glasses with AC nanocalorimetry experiments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigating the kinetic stability and transformation of vapor-deposited glasses with AC nanocalorimetry experiments./
作者:	Tylinski, Michael Tod.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	198 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
標題:	Physical chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10253505
ISBN:	9781369478518

Investigating the kinetic stability and transformation of vapor-deposited glasses with AC nanocalorimetry experiments.
Tylinski, Michael Tod.

Investigating the kinetic stability and transformation of vapor-deposited glasses with AC nanocalorimetry experiments. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 198 p.

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

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

This thesis presents experiments and discussion that advance the understanding of vapor-deposited glasses. When vapor-deposited glasses exhibit high kinetic stability, they're known as stable glasses. Stable glasses are known to transform into the liquid state via a front mechanism. My first project introduced a quantitative evaluation of the uniformity of these fronts over time and space. I found that the front velocity varies by less than 4% over the duration of the transformation. For films 280 nm thick, the transformation rates at different spatial positions in the film differ by about 25%; this quantity may be related to spatially heterogeneous dynamics in the stable glass. In my second project, I established that vapor deposition could be used to prepare stable glasses of an alcohol molecule. It was previously unknown if this was possible. I also found that while at least one alcohol molecule can be used to prepare a stable glass, several other alcohol molecules formed glasses with minimal kinetic stability when using standard deposition conditions. The wide range of kinetic stabilities is useful for investigating the factors that control stable glass formation. I compared the kinetic stability of vapor deposited glasses prepared from 14 molecules and found a correlation with the value of taualpha at 1.25 Tg. In my final research project, I performed experiments that tested various hypotheses for why 2-ethyl-1-hexanol forms vapor-deposited glasses with limited kinetic stability when using standard preparation conditions. The experiments supported the hypothesis that the surface mobility is less than for other molecules that are used to prepare stable glasses. My analysis of the data led to the estimation that at the substrate temperature commonly used to deposit stable glasses, 2-ethyl-1-hexanol molecules at the surface move more than 104 times slower compared to molecules that do form highly stable glasses using typical preparation conditions. The thesis concludes with proposed projects that would quantify the effect of hydrogen bonding on surface mobility in glasses, and explore the limit of kinetic stability in vapor-deposited glasses in order to learn about the supercooled liquid below the glass transition temperature.

ISBN: 9781369478518Subjects--Topical Terms:

1981412
Physical chemistry.

Investigating the kinetic stability and transformation of vapor-deposited glasses with AC nanocalorimetry experiments.
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