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QENS study on thermal gelation in aqueous solution of methylcellulose

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Title: QENS study on thermal gelation in aqueous solution of methylcellulose
Authors: Onoda-Yamamuro, N.1 yamamuro@u.dendai.ac.jp, Yamamuro, O.2, Inamura, Y.2, Nomura, H.1
Source: Physica B. Apr2007, Vol. 393 Issue 1/2, p158-160. 3p.
Subjects: Gelation, Cellulose, Chemical processes, Neutron scattering
Abstract: Abstract: Dynamics of water and methylcellulose (MC) molecules in MC aqueous solution has been studied by means of quasi-elastic neutron-scattering (QENS) measurements. The dynamic structure factor S(Q,E) of the MC aqueous solution was fitted well to the sum of Lorentzian and delta functions. The former is attributed to diffusive motion of water molecules and the latter to local vibrational motion of MC molecules. The self-diffusion coefficient of water molecules was obtained from the Q dependence of the half-width at half-maximum (HWHM) of the Lorentzian function, while the mean-square displacement of MC molecules from the Q dependence of the intensity of the delta term. Both the diffusion coefficient and the mean-square displacement gradually increased on heating and abruptly decreased around the thermal gelation temperature (around 320K). The present results revealed that the microscopic motions of both water and MC molecules give rise to dynamic slowing down on thermal gelation. [Copyright &y& Elsevier]
Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 24634623
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: QENS study on thermal gelation in aqueous solution of methylcellulose
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  Data: <searchLink fieldCode="AR" term="%22Onoda-Yamamuro%2C+N%2E%22">Onoda-Yamamuro, N.</searchLink><relatesTo>1</relatesTo><i> yamamuro@u.dendai.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yamamuro%2C+O%2E%22">Yamamuro, O.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Inamura%2C+Y%2E%22">Inamura, Y.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Nomura%2C+H%2E%22">Nomura, H.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Physica+B%22">Physica B</searchLink>. Apr2007, Vol. 393 Issue 1/2, p158-160. 3p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Gelation%22">Gelation</searchLink><br /><searchLink fieldCode="DE" term="%22Cellulose%22">Cellulose</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+processes%22">Chemical processes</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+scattering%22">Neutron scattering</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: Dynamics of water and methylcellulose (MC) molecules in MC aqueous solution has been studied by means of quasi-elastic neutron-scattering (QENS) measurements. The dynamic structure factor S(Q,E) of the MC aqueous solution was fitted well to the sum of Lorentzian and delta functions. The former is attributed to diffusive motion of water molecules and the latter to local vibrational motion of MC molecules. The self-diffusion coefficient of water molecules was obtained from the Q dependence of the half-width at half-maximum (HWHM) of the Lorentzian function, while the mean-square displacement of MC molecules from the Q dependence of the intensity of the delta term. Both the diffusion coefficient and the mean-square displacement gradually increased on heating and abruptly decreased around the thermal gelation temperature (around 320K). The present results revealed that the microscopic motions of both water and MC molecules give rise to dynamic slowing down on thermal gelation. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physica B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.physb.2006.12.080
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      – Code: eng
        Text: English
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        PageCount: 3
        StartPage: 158
    Subjects:
      – SubjectFull: Gelation
        Type: general
      – SubjectFull: Cellulose
        Type: general
      – SubjectFull: Chemical processes
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      – SubjectFull: Neutron scattering
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      – TitleFull: QENS study on thermal gelation in aqueous solution of methylcellulose
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              Text: Apr2007
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              Y: 2007
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