期刊
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
卷 696, 期 1, 页码 75-92出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2020.1731095
关键词
Catanionics; DSC; FTIR; phase transitions; quaternary ammonium salts; saturatedn-fatty acids; XRD
资金
- National Academy of Sciences of Ukraine under the Ukrainian Government [KPKVK 6541230]
- Polish-Ukrainian Scientific Cooperation Program under the Project Structural and optical properties of disordered molecular systems for optoelectronics
Chain length effect on the structure and thermotropic properties of asymmetric solid catanionic complexes (CAC) built of cetyltrimethylammonium bromide (C(16)TABr) and saturatedn-fatty acids (C(n)SFA, CnH2nO2,n = 12, 18, 20, and 22) was investigated by XRD, DSC, and FTIR spectroscopy. All CAC show a lamellar crystalline structure and a series of solid-solid phase transitions below the melting point. The phase transitions are suggested to be caused by sequential melting of the methylene chains in the hydrophobic layer followed by a change in the crystalline structure. C(16)TABr stabilizes the bilayer structure of CAC and raises its melting point compared to initial C(n)SFA.
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