Self-assembly of positively charged platinum nanoparticles in lysozyme crystal

• Published in: Chemical physics letters Vol. 604; pp. 110 - 115
• Main Authors: Takeda, Yoshihiro, Mafuné, Fumitaka
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 03.06.2014
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2014.04.051

[Display omitted] •Positively and negatively charged Pt NPs were assembled in lysozyme crystals.•Positively charged Pt NPs are assembled more efficiently than negative ones.•Negatively charged Pt NPs tend to aggregate more readily than positive ones by salts.•The dispersivity of NPs in solution is important for assembly into crystals. Assembling mechanism of platinum nanoparticles into a {101} sectors of a tetragonal lysozyme crystal was examined for two different types of the platinum nanoparticles which have either positive or negative ζ potential at pH 3–7. The distribution coefficient of the positive ones inside the crystal is much higher than that of the negative ones in the whole pH range investigated. Dispersivity of the platinum nanoparticles before interaction with the lysozyme crystal surface, which is controlled by electrostatic interactions between nanoparticles, lysozyme and NaCl, causes a profound difference on the assembly of the nanoparticles into the crystal.