Hydrophilic Polydopamine Coatings by Utilizing Nanoparticles

Polydopamine (PDA), a versatile polymer with strong surface adhesion and tunable properties, holds significant promise for biomedical and environmental applications. This study investigates the influence of nanoparticles carbon quantum dots (CQD), SiO۲ nanoparticles, graphene oxide (GO), and halloysite nano clay on the hydrophilicity and morphology of PDA films. Nanoparticles were dispersed in Tris buffer (pH ۸.۵) at concentrations ranging from ۰.۰۵ to ۲ mg/mL, followed by dopamine hydrochloride (۲ mg/mL) addition and ۲۴-hour polymerization on glass substrates. Hydrophilicity, assessed via water contact angle (WCA), revealed all films as highly hydrophilic (WCA <۴۵°), with ۰.۵ mg/mL CQD yielding the lowest WCA (superior wettability), attributed to synergistic nanoscale interactions enhancing surface roughness and functional groups. Film thickness, inferred from CIE L*a*b* colorimetry (lower L* darker, thicker films), showed maximal thickness at ۱-۱.۵ mg/mL CQD, while ۰.۵ mg/mL CQD exhibited notable thickness (L*=۲۸), highlighting concentration-dependent morphological control. These results demonstrate that nanoparticle type and concentration critically govern PDA film properties, with CQD-incorporated formulations showing exceptional wettability and tunable thickness. Such tailored films offer potential in antifouling coatings, biomedical implants, biosensors, and filtration membranes, where precise control over hydrophilicity and layer density is essential. This work advances the design of functional PDA nanocomposites through strategic nanoparticle integration.

کلیدواژه ها:

Polydopamine ، GO ، CQD ، Halloysite nanocaly ، Silica nanoparticle