AI Article Synopsis
- Amino acid-based surfactants were used to create new lyotropic mixtures with three types of nematic phases: one biaxial and two uniaxial (discotic and calamitic).
- Among the surfactants tested, the mixture with potassium-dodecanoyl-DL-serinate (DL-KDDS) showed the largest biaxial phase domain of around 9 °C.
- Optical birefringence measurements and X-ray diffraction analysis revealed that hydrogen bonding in the KDDGly mixture affects the orientation of micelles when subjected to an external magnetic field.
Article Abstract
Amino acid-based surfactants were used as the main surfactants to prepare new lyotropic mixtures presenting three nematic phases. One of them is biaxial (), and the two others are uniaxial, discotic () and calamitic (). These surfactants were the non-chiral molecules, potassium -dodecanoyl-DL-alaninate (DL-KDDA), potassium -dodecanoyl-DL-serinate (DL-KDDS), disodium dodecanoyl-DL-aspartate (DL-NaDDAs) and potassium -dodecanoyl-glycinate (KDDGly). Measurements of the optical birefringences and X-ray diffraction analysis were used to characterize the nematic phases and phase transitions. Mixtures with DL-KDDS exhibited the largest biaxial phase domain (~9 °C) with respect to the other mixtures in this study. The results obtained with the KDDGly mixture showed that the existence of hydrogen bonding between the head groups of the surfactant molecules seems to hinder the orientation of the micelles under the action of an external magnetic field.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455919 | PMC |
| http://dx.doi.org/10.3390/ma7064132 | DOI Listing |
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