These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Creation of chiral thixotropic gels through a crown-ammonium interaction and their application to a memory-erasing recycle system.
    Author: Sobczuk AA, Tsuchiya Y, Shiraki T, Tamaru S, Shinkai S.
    Journal: Chemistry; 2012 Mar 05; 18(10):2832-8. PubMed ID: 22290582.
    Abstract:
    A unique class of oligothiophene-based organogelator bearing two crown ethers at both ends was synthesized. This compound could gelatinize several organic solvents, forming one-dimensional fibrous aggregates. From the observation of circular dichroism, it was confirmed that the helical handedness of the fibrous assembly is controllable by the chirality of 1,2-bisammonium guests, thus suggesting that one guest molecule bridges two gelator molecules through the crown-ammonium interaction. Interestingly, we have found that such chirality is created by thermal gelation, whereas it disappears by thixotropic gelation. The new finding implies that the present organogel system is applicable as a reversible switching memory device, featuring memory creation by a heat mode and memory erasing by a mechanical mode.
    [Abstract] [Full Text] [Related] [New Search]