{"date_published":"2012-01-28T00:00:00Z","article_type":"original","month":"01","_id":"9049","year":"2012","abstract":[{"lang":"eng","text":"Diffusiophoretic motion of colloids and macromolecules under salt gradients exhibits a logarithmic-sensing, i.e. the particle velocity is proportional to the spatial gradient of the logarithm of the salt concentration, as VDP = DDP∇logc. Here we explore experimentally the implications of this log-sensing behavior, on the basis of a hydrogel microfluidic device allowing to build spatially and temporally controlled gradients. We first demonstrate that the non-linearity of the salt-taxis leads to a trapping of particles under concentration gradient oscillations via a rectification of the motion. As an alternative, we make use of the high sensitivity of diffusiophoretic migration to vanishing salt concentration due to the log-sensing: in a counter-intuitive way, a vanishing gradient can lead to measurable velocity provided that the solute concentration is low enough, thus keeping ∇c/c finite. We show that this leads to a strong segregation of particles in osmotic shock configuration, resulting from a step change of the salt concentration at the boundaries. These various phenomena are rationalized on the basis of a theoretical description for the time-dependent Smoluchowski equation for the colloidal density."}],"title":"Osmotic traps for colloids and macromolecules based on logarithmic sensing in salt taxis","quality_controlled":"1","type":"journal_article","publication":"Soft Matter","status":"public","issue":"4","doi":"10.1039/c1sm06395b","publication_identifier":{"issn":["1744-683X"],"eissn":["1744-6848"]},"date_updated":"2023-02-23T13:47:31Z","date_created":"2021-02-01T13:43:10Z","author":[{"last_name":"Palacci","id":"8fb92548-2b22-11eb-b7c1-a3f0d08d7c7d","first_name":"Jérémie A","full_name":"Palacci, Jérémie A","orcid":"0000-0002-7253-9465"},{"last_name":"Cottin-Bizonne","full_name":"Cottin-Bizonne, Cécile","first_name":"Cécile"},{"last_name":"Ybert","first_name":"Christophe","full_name":"Ybert, Christophe"},{"first_name":"Lydéric","full_name":"Bocquet, Lydéric","last_name":"Bocquet"}],"oa_version":"None","day":"28","language":[{"iso":"eng"}],"scopus_import":"1","citation":{"short":"J.A. Palacci, C. Cottin-Bizonne, C. Ybert, L. Bocquet, Soft Matter 8 (2012) 980–994.","mla":"Palacci, Jérémie A., et al. “Osmotic Traps for Colloids and Macromolecules Based on Logarithmic Sensing in Salt Taxis.” <i>Soft Matter</i>, vol. 8, no. 4, Royal Society of Chemistry, 2012, pp. 980–94, doi:<a href=\"https://doi.org/10.1039/c1sm06395b\">10.1039/c1sm06395b</a>.","ieee":"J. A. Palacci, C. Cottin-Bizonne, C. Ybert, and L. Bocquet, “Osmotic traps for colloids and macromolecules based on logarithmic sensing in salt taxis,” <i>Soft Matter</i>, vol. 8, no. 4. Royal Society of Chemistry, pp. 980–994, 2012.","apa":"Palacci, J. A., Cottin-Bizonne, C., Ybert, C., &#38; Bocquet, L. (2012). Osmotic traps for colloids and macromolecules based on logarithmic sensing in salt taxis. <i>Soft Matter</i>. Royal Society of Chemistry. <a href=\"https://doi.org/10.1039/c1sm06395b\">https://doi.org/10.1039/c1sm06395b</a>","ista":"Palacci JA, Cottin-Bizonne C, Ybert C, Bocquet L. 2012. Osmotic traps for colloids and macromolecules based on logarithmic sensing in salt taxis. Soft Matter. 8(4), 980–994.","chicago":"Palacci, Jérémie A, Cécile Cottin-Bizonne, Christophe Ybert, and Lydéric Bocquet. “Osmotic Traps for Colloids and Macromolecules Based on Logarithmic Sensing in Salt Taxis.” <i>Soft Matter</i>. Royal Society of Chemistry, 2012. <a href=\"https://doi.org/10.1039/c1sm06395b\">https://doi.org/10.1039/c1sm06395b</a>.","ama":"Palacci JA, Cottin-Bizonne C, Ybert C, Bocquet L. Osmotic traps for colloids and macromolecules based on logarithmic sensing in salt taxis. <i>Soft Matter</i>. 2012;8(4):980-994. doi:<a href=\"https://doi.org/10.1039/c1sm06395b\">10.1039/c1sm06395b</a>"},"publication_status":"published","publisher":"Royal Society of Chemistry","page":"980-994","user_id":"D865714E-FA4E-11E9-B85B-F5C5E5697425","intvolume":"         8","extern":"1","article_processing_charge":"No","volume":8}