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. 2017 Nov 25;17(12):2723. doi: 10.3390/s17122723

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) RI of hydrogel computed from Equation (13) and (17) for pH 5 to 3; (b) scattering cross-section computed from Equation (1) with $L = 1$ for $n_{m} = n_{gel}$ at 1.333 and 1.346.