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Protective Coatings Against Formation of Scale Deposits

Polymers have played an essential role in development of technology, applied engineering, and materials. Metallic counterparts in medical, construction, energy, water treatment, and electronic applications, are often replaced by polymers. Their characteristics such as wide range of elasticity, strength and degradability make them ideal for numerous applications.

Product Number: 51323-19528-SG
Author: P.D. Natsi, E. Zande, P.G. Koutsoukos
Publication Date: 2023
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Hydrophilic polymers are known to induce the deposition of sparingly soluble salts. Poly-2-hydroxyethyl
methacrylate, (PHEMA), a hydrogel used for the fabrication of contact and intraocular lenses has been
reported to favor the nucleation and crystal growth of calcium phosphate. PHEMA disks coated with
graphene oxide (GO) were good nucleators of Hydroxyapatite (HAP). which precipitated at rates higher
in comparison with the respective on the uncoated material. The mechanism of HAP crystal growth was
controlled by surface diffusion as shown by the dependence of the rates on the relative supersaturation
with respect to HAP. GO was reduced with phenyl hydrazine at ambient conditions yielding reduced GO
(rGO) coated PHEMA. The hydrophobic rGO, inhibited drastically the crystal growth of HAP suggesting
that surface hydrophilicity is a very important feature favoring nucleation and growth of sparingly soluble
salts, possibly through the development of locally high supersaturation because of surface complexation.

Hydrophilic polymers are known to induce the deposition of sparingly soluble salts. Poly-2-hydroxyethyl
methacrylate, (PHEMA), a hydrogel used for the fabrication of contact and intraocular lenses has been
reported to favor the nucleation and crystal growth of calcium phosphate. PHEMA disks coated with
graphene oxide (GO) were good nucleators of Hydroxyapatite (HAP). which precipitated at rates higher
in comparison with the respective on the uncoated material. The mechanism of HAP crystal growth was
controlled by surface diffusion as shown by the dependence of the rates on the relative supersaturation
with respect to HAP. GO was reduced with phenyl hydrazine at ambient conditions yielding reduced GO
(rGO) coated PHEMA. The hydrophobic rGO, inhibited drastically the crystal growth of HAP suggesting
that surface hydrophilicity is a very important feature favoring nucleation and growth of sparingly soluble
salts, possibly through the development of locally high supersaturation because of surface complexation.