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Author Lüttschwager, Nils Olaf Bernd, author

Title Raman spectroscopy of conformational rearrangements at low temperatures : folding and stretching of alkanes in supersonic jets / Nils Olaf Bernd Lüttschwager
Published Cham : Springer, 2014

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Description 1 online resource (xii, 183 pages) : illustrations (some color)
Series Springer theses, 2190-5053
Springer theses, 2190-5053
Contents Introduction -- Background -- Experimental -- Unbranched n-alkanes -- Perfluorinated alkanes -- Modulus of elasticity -- Summary and outlook -- Appendix
Summary This thesis identifies the turning point in chain length, after which alkanes self-solvate into a folded structure instead of an extended stretched conformation. After this turning point, London dispersion forces rearrange isolated n-alkanes into a particular hairpin-structure, whilefor shorter chain lengths, a simple stretched conformation is energetically preferred. This thesis can locate the experimental turning point for the first timein aninteraction-free manner from measurements of unbranched alkanes at low temperaturesin supersonic jet expansions. It contains a detailed analysis of the vibrational Raman spectra of the chain molecules, which is supported by comprehensive quantum chemical simulations. In this way, the detailed balance between inter-chain attraction and conformational flexibilitycan bequantified. The investigations are complemented by measurements of perfluoroalkanes, and similarities and differences between the compounds are discussed. Furthermore, Nils Lüttschwagerdetermines the stiffnesses (elastic moduli) of two of the most common industrial polymers: polyethylene and polytetrafluorethylene. He uses in this thesis a sophisticated extrapolation to calculate this value from quantities of their building blocks, showing thatthe single polymer molecules can be as stiff as a rod of steel
Analysis chemie
chemistry
fysische chemie
physical chemistry
moleculaire fysica
molecular physics
spectrometrie
spectrometry
microscopie
microscopy
polymeren
polymers
Chemistry (General)
Chemie (algemeen)
Notes "Doctoral thesis accepted by the Georg-August-University Göttingen, Germany."
Bibliography Includes bibliographical references
Notes English
Online resource; title from PDF title page (SpringerLink, viewed August 27, 2014)
Subject Raman spectroscopy.
Conformational analysis.
Cryochemistry.
Alkanes
alkane.
SCIENCE -- Chemistry -- Analytic.
Alkanes
Conformational analysis
Cryochemistry
Raman spectroscopy
Form Electronic book
ISBN 9783319085661
3319085662
3319085654
9783319085654