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Evaluation of the effects of iron na...

Glaze, Kelly R.

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Evaluation of the effects of iron nanowires on polystyrene microthin films.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Evaluation of the effects of iron nanowires on polystyrene microthin films./
Author:	Glaze, Kelly R.
Description:	63 p.
Notes:	Source: Masters Abstracts International, Volume: 52-02.
Contained By:	Masters Abstracts International52-02(E).
Subject:	Chemistry, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1544765
ISBN:	9781303360961

Evaluation of the effects of iron nanowires on polystyrene microthin films.
Glaze, Kelly R.

Evaluation of the effects of iron nanowires on polystyrene microthin films. - 63 p.

Source: Masters Abstracts International, Volume: 52-02.

Thesis (M.S.)--Lamar University - Beaumont, 2013.

The different properties that polymer films possess compared to their bulk materials have been studied over the past several decades. One explanation for this involves interactions between substrates and films, and the use of nanoparticles has emerged as an alternative means of investigating these interactions. The objective of this study is to determine the effects and the nature of interactions between iron (Fe) nanowires and polystyrene (PS) microthin films. Investigation of the interactions by utilization of physical, thermal, and spectral methodologies was performed on four types of PS film samples based on the possible combinations of unstretched or stretched films that were without or with Fe nanowires. Differential scanning calorimetry (DSC) experiments were performed on heating the four types of PS film samples. Compared to the glass transition temperature (Tg) of the bulk material (&sim;94 °C), the average experimental Tg of unstretched PS films without Fe nanowires was 84.0 °C, which decreased after the addition of Fe nanowires to 67.5 °C, presumably due to the thermal conductivity of the nanowires. Polarized light microscope (PLM) images showed color differences with 90° polarization using a 530 nm filter in areas around Fe nanowires in stretched PS film samples. The differences may have been due to orientation changes caused by interactions with Fe nanowires, or the nanowires may have either hindered or prevented stretching in surrounding areas, leaving those areas a similar shade of pink as the background. Fourier Transform infrared spectroscopy (FT-IR) as a function of polarization angle confirmed the expectation that the physical effect of stretching a PS film without the addition of nanoparticles is sufficient to produce linear absorbance variations. FT-IR as a function of temperature suggested that absorbance decreases were caused by the PS film melting, which may have been hastened by the physical interaction of Fe nanowires conducting heat. Two-dimensional correlation spectroscopy (2-D IR) with the external perturbation of increasing polarization angle did not provide indications of chemical interactions, and differences observed among synchronous and asynchronous 2-D IR spectra with the external perturbation of increasing temperature indicated only physical differences, physical effects, or physical interactions with Fe nanowires. These results led to the conclusion that there were no clear indications of chemical interactions between Fe nanowires and PS chains and that all observed changes in PS microthin films were of a physical nature.

ISBN: 9781303360961Subjects--Topical Terms:

1021807
Chemistry, General.

Evaluation of the effects of iron nanowires on polystyrene microthin films.
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245 1 0 $a Evaluation of the effects of iron nanowires on polystyrene microthin films.
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500 $a Source: Masters Abstracts International, Volume: 52-02.
500 $a Adviser: Paul Bernazzani.
502 $a Thesis (M.S.)--Lamar University - Beaumont, 2013.
520 $a The different properties that polymer films possess compared to their bulk materials have been studied over the past several decades. One explanation for this involves interactions between substrates and films, and the use of nanoparticles has emerged as an alternative means of investigating these interactions. The objective of this study is to determine the effects and the nature of interactions between iron (Fe) nanowires and polystyrene (PS) microthin films. Investigation of the interactions by utilization of physical, thermal, and spectral methodologies was performed on four types of PS film samples based on the possible combinations of unstretched or stretched films that were without or with Fe nanowires. Differential scanning calorimetry (DSC) experiments were performed on heating the four types of PS film samples. Compared to the glass transition temperature (Tg) of the bulk material (&sim;94 °C), the average experimental Tg of unstretched PS films without Fe nanowires was 84.0 °C, which decreased after the addition of Fe nanowires to 67.5 °C, presumably due to the thermal conductivity of the nanowires. Polarized light microscope (PLM) images showed color differences with 90° polarization using a 530 nm filter in areas around Fe nanowires in stretched PS film samples. The differences may have been due to orientation changes caused by interactions with Fe nanowires, or the nanowires may have either hindered or prevented stretching in surrounding areas, leaving those areas a similar shade of pink as the background. Fourier Transform infrared spectroscopy (FT-IR) as a function of polarization angle confirmed the expectation that the physical effect of stretching a PS film without the addition of nanoparticles is sufficient to produce linear absorbance variations. FT-IR as a function of temperature suggested that absorbance decreases were caused by the PS film melting, which may have been hastened by the physical interaction of Fe nanowires conducting heat. Two-dimensional correlation spectroscopy (2-D IR) with the external perturbation of increasing polarization angle did not provide indications of chemical interactions, and differences observed among synchronous and asynchronous 2-D IR spectra with the external perturbation of increasing temperature indicated only physical differences, physical effects, or physical interactions with Fe nanowires. These results led to the conclusion that there were no clear indications of chemical interactions between Fe nanowires and PS chains and that all observed changes in PS microthin films were of a physical nature.
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