Journal ArticleDOI
Phase Transitions and Nonplanar Conformers in Crystalline n-Alkanes.
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TLDR
Crystals of n-alkanes show a remarkable series of solid-solid phase transitions and the ubiquitous presence of nonplanar conformations of the chains is shown by infrared spectroscopy.Abstract:
Crystals of n-alkanes show a remarkable series of solid-solid phase transitions. In the odd n-alkanes C(25), C(27), and C(29) a previously unknown transition is found by both calorimetry and infrared spectroscopy. The ubiquitous presence of nonplanar conformations of the chains is shown by infrared spectroscopy. The nonplanar conformers constitute approximately half the molecules in the highest temperature solid phase of C(29).read more
Citations
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Reversible crystallization and the rigid-amorphous phase in semicrystalline macromolecules
B Wunderlich,B Wunderlich +1 more
TL;DR: In this paper, the vibrational heat capacity of crystal and glass data was used for analysis of macromolecules in the semicrystalline state and the transitions of the rigid-amorphous phase and the major reversible processes involving latent heats.
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Fourier transform infrared spectrometric determination of alkyl chain conformation on chemically bonded reversed-phase liquid chromatography packings
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Normal Alkanes, Multialkane Synthetic Model Mixtures, and Real Petroleum Waxes: Crystallographic Structures, Thermodynamic Properties, and Crystallization
Michel Dirand,Mohammed Bouroukba,and Virginie Chevallier,D. Petitjean,Emmanuel Behar and,Veronique Ruffier-Meray +5 more
TL;DR: In this paper, a general review of the structural and thermodynamic properties of n-alkane mixtures is presented, which highlights the existence of isostructural binary, ternary, and multinary intermediate solid solutions which can be likened to a single pseudocomponent.
Journal ArticleDOI
Functional Group Identification in Scanning Tunneling Microscopy of Molecular Adsorbates
TL;DR: In this article, a scanning tunneling microscope (STM) imaging mechanism was proposed to describe the STM imaging mechanism for these insulating, physisorbed films in which th
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The distribution of conformational disorder in the high-temperature phases of the crystalline n-alkanes
TL;DR: In this article, the authors used a modification of a lattice model that had been successfully applied to the lipid bilayer to explain the distribution of conformational defects that exist in the high temperature phase II of the crystalline nalkanes C21 and C29.
References
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Vibrational analysis of the n-paraffins—II
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Physical studies of phospholipids. VI. Thermotropic and lyotropic mesomorphism of some 1,2-diacyl-phosphatidylcholines (lecithins)
TL;DR: The thermotropic and lyotropic mesomorphism of saturated 1,2-diacyl-L-phosphatidylcholines (lecithins) has been studied by light microscopy, differential thermal analysis, X-ray diffraction, infrared and nuclear magnetic resonance spectroscopy.
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Vibrational Study of the Chain Conformation of the Liquid n‐Paraffins and Molten Polyethylene
TL;DR: In this article, a vibrational and attendant conformational analysis of the liquid n-paraffins and molten polyethylene is presented, and a valence force field is derived which is applicable to both planar and nonplanar chains.
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Vibrational analysis of the n-paraffins—I: Assignments of infrared bands in the spectra of C3H8 through n-C19H40
TL;DR: In this paper, the infrared spectra of fully extended n-paraffin molecules from C 3 H 8 through n-C 19 H 40 were reported together with complete vibrational assignments based on frequency-phase curves and normal co-ordinate calculations.
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Theory of the Main Lipid Bilayer Phase Transition
TL;DR: The lipid bilayer phase transition (to be abbreviated LBPT), often called the gel to liquid crystal phase transition, appears to have direct biological relevance (1-5). Even if it did not, it is neverthe less a striking physical event, the study of which leads to a better understanding of the structure of biological membranes.