Hydrogen-Bonding Density of Supramolecular Self-Assembled Fibrillar Networks Probed Using Synchrotron Infrared Spectromicroscopy

We employed synchrotron infrared spectromicroscopy to provide new insights into the development of self-assembled fibrillar networks. The noncovalent interactions responsible for the occurrence of transient junction zone in 12HSA arise because of hydroxyl−hydroxyl hydrogen bonding. This may result f...

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Bibliographic Details
Published inCrystal growth & design Vol. 9; no. 8; pp. 3621 - 3625
Main Authors Rogers, Michael A, Pedersen, Tor, Quaroni, Luca
Format Journal Article
LanguageEnglish
Published Washington,DC American Chemical Society 05.08.2009
Subjects
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Materials science
Methods of crystal growth; physics of crystal growth
Methods of nanofabrication
Organic compounds
Physics
Self-assembly
Solid-solid transitions
Specific phase transitions
Structure of solids and liquids; crystallography
Structure of specific crystalline solids
Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation
Epitaxial layers
Epitaxy
Crystallization
Carboxylic acids
Fibers
Transients
Interfaces
Self-assembly
Hydrogen bonds
Chirality
Supramolecular structure
Growth mechanism
Synchrotron radiation
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Summary:We employed synchrotron infrared spectromicroscopy to provide new insights into the development of self-assembled fibrillar networks. The noncovalent interactions responsible for the occurrence of transient junction zone in 12HSA arise because of hydroxyl−hydroxyl hydrogen bonding. This may result from the preferential arrangement of carboxylic acid groups to dimerize within the fiber, resulting in a reduction of the fiber−solvent interfacial tension. As well, synchrotron infrared spectromicroscopy indicates that the crystallization process of SAFiNs efficiently displaces solvent from the interface of the growing crystals contributing to the epitaxial growth into axially symmetric elongated aggregates. The periodicity in the density of hydrogen bonding resolves the supramolecular chirality of 12HSA fibers.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg900370g