Observation of Steady Shear-Induced Nematic Ordering of Selenium Chain Moieties in Arsenic Selenide Liquids.

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  • Additional Information
    • Source:
      Publisher: American Chemical Society Country of Publication: United States NLM ID: 101157530 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5207 (Electronic) Linking ISSN: 15205207 NLM ISO Abbreviation: J Phys Chem B Subsets: PubMed not MEDLINE
    • Publication Information:
      Original Publication: Washington, D.C. : American Chemical Society, c1997-
    • Abstract:
      Structural anisotropy induced by steady shear and its mechanistic relation with shear thinning are investigated in As x Se 100-x glasses (5 ≤ x ≤ 30) quenched from parent liquids subjected to shear rates ranging between 0 and 10 4 s -1 using polarized Raman spectroscopy and two-dimensional X-ray diffraction. When taken together, the results demonstrate significant shear-induced partial alignment of -Se-Se-Se- chain moieties in the flow direction of the extruded fibers. This alignment is reminiscent of nematic liquid crystals where orientational order exists without positional order. The degree of this structural alignment in quenched glasses appears to be practically independent of the shear rate, although the parent liquids undergo shear thinning at the highest shear rates. It is conjectured that any causal relationship between structural alignment and shear thinning in the liquid may be masked in the glassy state by the postextrusion structural relaxation of the parent liquid.
    • Publication Date:
      Date Created: 20170721 Date Completed: 20180420 Latest Revision: 20180420
    • Publication Date:
      20250114
    • Accession Number:
      10.1021/acs.jpcb.7b05115
    • Accession Number:
      28726409