The authors describe small‐angle neutron scattering measurements of the screening length ζ in polyacrylamide‐water gels. Although these are inhomogeneous systems, the screening length is clearly observable and is in good numerical agreement with the relation E = 3 kT /4πζ 3 , where E is the longitudinal elastic modulus of the gel obtained from measurements of the intensity of qu‐asielastically scattered light. Static light scattering observations reveal a larger‐scale (ca. 30 nm) superstructure in the gel.
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Geissler et al. (1982) studied this question.
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