Physico-chemical surface properties of microalgae

• Published in: Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2013-12, Vol.112, p.287-293
• Main Authors: Ozkan, Altan, Berberoglu, Halil
• Format: Article
• Language: English
• Subjects: Algae; Algal biofilm; Bacillariophyceae; Bioengineering; Biofouling; Biomass; Chlorophycota; Chlorophyta - metabolism; Cohesion; colloids; Contact angle; Culture; Cyanobacteria; Cyanobacteria - metabolism; Diatoms - metabolism; electrophoresis; energy; Flocculation; Free energy; Fresh Water - microbiology; harvesting; Hydrophobic and Hydrophilic Interactions; hydrophobicity; Mathematical models; Membrane Potentials; microalgae; Microalgae - growth & development; Microalgae - metabolism; microbial fuel cells; saline water; Sea water; seawater; Seawater - microbiology; Surface Properties; surface tension; Thermodynamics; van der Waals forces; zeta potential
• ISSN: 0927-7765; 1873-4367
• DOI: 10.1016/j.colsurfb.2013.08.001

Surface interactions of microalgae controlled by physico-chemical surface properties. •Complete set of experimentally measured physico-chemical surface properties of microalgae are reported.•12 species of fresh and saltwater species from green algae, diatoms, and cyanobacteria are included.•Electron donor parameter dominated the acid–base interactions for all species.•Electron donor parameter had a strong one-to-one correlation with free energy of cohesion for all species.•Colony forming and/or benthic species displayed highly hydrophobic surfaces. This study reports a comprehensive set of experimentally measured physico-chemical surface properties of 12 different microalgae including fresh and seawater species of green algae, diatoms and cyanobacteria. The surface free energy and its components including the acid-base (AB), van der Waals (LW), electron donor/acceptor parameters were quantified based on contact angle measurements along with the Lifshitz–van der Waals acid–base approach using the probe liquid surface tension parameters proposed by van Oss et al. as well as by Della Volpe and Siboni. Moreover, the zeta and surface potentials of all species were determined using electrophoretic mobility measurements along with using Smoluchowski's model. Finally, the free energy of cohesion of the microalgae was also determined based on the calculated surface energy properties. The results showed that the electron donor parameter correlated well with the free energy of cohesion in all groups of microalgae. Moreover, species known to form colonies and exhibit benthic cultures had distinctly hydrophobic surfaces compared to microalgae prefering planktonic growth. These results indicate the importance of surface hydrophobicity for causing biofouiling or flocculation of cultures. Finally, the zeta potentials did not show a distinctive trend with the types of microalgae but the surface potentials were markedly larger for the salt water species. The reported methods and data are expected to provide critical information for researchers and technology developers concerned with cell to cell and cell to substrata interactions of microalgae in algal biomass cultivation and harvesting, biofouling of membranes and surfaces, as well as cell-surface interactions in photosynthetic microbial fuel cell technologies.