Internal structures of agar-gelatin co-hydrogels by light scattering, small-angle neutron scattering and rheology

Regular Article


Internal structures of agar-gelatin co-hydrogels were investigated as a function of their volumetric mixing ratio, \(\ensuremath r=[\mathrm{AG}]:[\mathrm{Ge}]=0.5\) , 1.0 and 2.0 using dynamic light scattering (DLS), small-angle neutron scattering (SANS) and rheology. The degree of non-ergodicity ( \(\ensuremath X=0.2\pm0.02\) , which was extracted as a heterodyne contribution from the measured dynamic structure factor data remained less than that of homogeneous solutions where ergodicity is expected (X = 1 . The static structure factor, I(q) , results obtained from SANS were interpreted in the Guinier regime (low-q , which implied the existence of \( \approx\) 250 nm long rod-like structures (double-helix bundles), and the power law (intermediate-q regions yielded \(\ensuremath I(q)\sim q^{-\alpha}\) , with \( \alpha\) = 2.3 , 1.8 and 1.6 for r = 0.5 , 1.0 and 2.0. This is indicative of the presence of Gaussian chains at low r , while at r = 2 there was a propensity of rod-shaped structures. The gel strength and transition temperatures measured from frequency sweep and temperature ramp studies were suggestive of the presence of a stronger association between the two biopolymer networks at higher r . The results indicate that the internal structures of agar-gelatin co-hydrogels were highly dependent on the volumetric mixing ratio.


Gelatin Fractal Dimension Dynamic Light Scattering Dynamic Light Scattering Dynamic Structure Factor 
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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • S. Santinath Singh
    • 1
  • V. K. Aswal
    • 2
  • H. B. Bohidar
    • 1
  1. 1.Polymer and Biophysics Laboratory, School of Physical SciencesJawaharlal Nehru UniversityNew DelhiIndia
  2. 2.Solid State Physics DivisionBhaba Atomic Research CentreMumbaiIndia

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