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Zhong, J. PH Sensitivity. Encyclopedia. Available online: https://encyclopedia.pub/entry/61258 (accessed on 12 November 2026).
Zhong J. PH Sensitivity. Encyclopedia. Available at: https://encyclopedia.pub/entry/61258. Accessed November 12, 2026.
Zhong, Jack. "PH Sensitivity" Encyclopedia, https://encyclopedia.pub/entry/61258 (accessed November 12, 2026).
Zhong, J. (2026, October 22). PH Sensitivity. In Encyclopedia. https://encyclopedia.pub/entry/61258
Zhong, Jack. "PH Sensitivity." Encyclopedia. Web. 22 October, 2026.

PH Sensitivity

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Sensitivity to pH is the property of a polymer system whose ionisation, swelling or assembly state changes with the acidity of the surrounding medium [1]. Zwitterionic hydrogels reinforced with aramid nanofibers resist swelling while remaining responsive, a balance exploited in strain sensors [1]. Chitosan-based hydrogels swell and bend as pH shifts, and the response has been followed experimentally [2]. Bilayer hydrogel strips convert the same swelling mismatch into bending, analysed by both analytical and finite-element treatment [3]. Dual pH- and thermo-sensitive nanogels of poly(N-isopropylacrylamide-co-allylamine) show swelling-deswelling behaviour with a defined phase transition [4]. Nanosilica/poly(acrylic acid) macroporous hydrogels swell strongly and release amoxicillin as the pH changes [5].

ph-triggered swelling swelling hydrogel responsive polymer nanogel drug release
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References

  1. Chen, Z.; Zhong, W. Anti-Swelling Aramid-Nanofiber-Reinforced Zwitterionic Polymer Hydrogel for Strain Sensors. Materials 2025, 18, 1800. [CrossRef]
  2. Mehr, J.A.; Hatami-Marbini, H. Investigating Swelling and Bending Response of pH-Sensitive Chitosan-Based Hydrogels. Macromol 2025, 5, 57. [CrossRef]
  3. Askari-Sedeh, M.; Baghani, M. pH-Sensitive Hydrogel Bilayers: Investigation on Transient Swelling-Induced Bending through Analytical and FEM Approaches. Gels 2023, 9, 563. [CrossRef]
  4. Santhamoorthy, M.; Kim, S.C. Dual pH- and Thermo-Sensitive Poly(N-isopropylacrylamide-co-allylamine) Nanogels for Curcumin Delivery: Swelling–Deswelling Behavior and Phase Transition Mechanism. Gels 2023, 9, 536. [CrossRef]
  5. Sorkhabi, T.S.; Samberan, M.F.; Ostrowski, K.A.; Majka, T.M. Novel Synthesis, Characterization and Amoxicillin Release Study of pH-Sensitive Nanosilica/Poly(acrylic acid) Macroporous Hydrogel with High Swelling. Materials 2022, 15, 469. [CrossRef]
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Subjects: Polymer Science
Contributor MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register : Jack Zhong
View Times: 6
Revisions: 3 times (View History)
Update Date: 06 Nov 2026
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