Polydopamine Particle as a Particulate Emulsifier

Abstract

"Pickering-type" emulsions were prepared using polydopamine (PDA) particles as a particulate emulsifier and n-dodecane, methyl myristate, toluene or dichloromethane as an oil phase. All the emulsions prepared were oil-in-water type and an increase of PDA particle concentration decreased oil droplet diameter. The PDA particles adsorbed to oil-water interface can be crosslinked using poly(ethylene imine) as a crosslinker, and the PDA particle-based colloidosomes were successfully fabricated. Scanning electron microscopy studies of the colloidosomes after removal of inner oil phase revealed a capsule morphology, which is strong evidence for the attachment of PDA particles at the oil-water interface thereby stabilizing the emulsion. The colloidosomes after removal of inner oil phase could retain their capsule morphology, even after sonication. On the other hand, the residues obtained after oil phase removal from the PDA particle-stabilized emulsion prepared in the absence of any crosslinker were broken into small fragments of PDA particle flocs after sonication.

Fluorescent polycatecholamine nanostructures as a versatile probe for multiphase systems

“…The contact angle and zeta potential obtained for PDA agree with the values reported in the literature. 17,33 The hydrophobic surface of PEP can be attributed to the presence of additional methyl group in the precursor EP and the lower surface concentration of amine and hydroxyl groups in the resulting PEP nanostructures, which is in agreement with the zeta potentials obtained. This is further supported by the NMR data.…”

Bioinspired polydopamine coating‐assisted electrospun polyurethane‐graphene oxide nanofibers for bone tissue engineering application

“…In the case of pure PDA, the peaks at 1515 and 1605 cm −1 conform to the indole or indoline structures and vibration of NH . The wide peak at a range of about 3200–3500 cm −1 relates to the hydroxyls and amines structures . The phenolic OH vibration observes peaks at 1345 and 1285 cm −1 , respectively…”

A Comparison Study of Antiultraviolet and Sustained Release Properties of Polydopamine/Avermectin Microcapsule and Microsphere

“…The two bands that appeared at 1384 cm −1 and 1110 cm −1 belonged to the characteristic peaks of C-O-H and C-O on the phenolic hydroxyl. In comparison with DA, the characteristic peaks of indole and indoline structure were observed in the spectral line of PDAMS, PDAMC, AVM/PDAMS, and AVM@PDAMC, which confirmed the formation of polydopamine [34,35]. Compared with AVM, the characteristic peaks located at 2970 cm −1 , 1457 cm −1 , 1380 cm −1 , 789 cm −1 , and 595 cm −1 belonged to C-H, and the heteroaromatic ring of AVM was observed in the spectral lines of AVM/PDAMS and AVM@PDAMC.…”