Harmonic analysis of surface instability patterns on colloidal particles. Issue 17 (18th April 2018)

• Record Type: Journal Article
• Authors: Kämäräinen, Tero; Ago, Mariko; Seitsonen, Jani; Raula, Janne; Kauppinen, Esko I.; Ruokolainen, Janne; Rojas, Orlando J.
• Is Part Of: Soft matter. Volume 14:Issue 17(2018)
• Page Start: 3387
• Page End: 3396
• Publication Date: 2018-04-18
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c8sm00383a
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Spectral topographical analysis of wrinkled and crumpled colloidal particle surfaces utilizing cryo-electron tomography and spherical harmonic models. Abstract : Wrinkling of colloidal particles alter a wide variety of interfacial properties but quantitative topographical descriptions have been explored experimentally to a very limited extent. In this study, we present a harmonic analysis of surface wrinkles and folds on submicron colloidal particles, obtained using an aerosol flow route, with small radius (<300 nm) and high crust thickness-to-radius ratio (>0.1). The particle surface coordinates were mapped in their entirety using cryo-electron tomography and subsequently reconstructed using spherical harmonics, allowing a spectral topographical description of the instability patterns and the identification of their surface modes by lateral wavelength. Wrinkled and crumpled particles showed a similar surface roughness spectrum, wherein differences were found most noticeable in the large wavelength region. The analysis of preferred directions of harmonic frequencies indicated a possible axial or planar alignment attributed to the directionality of the surface corrugations. The employed characterization methodology can further the study of topographical influences on colloidal interactions.