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DTSTART;TZID=Europe/Paris:20210629T110000
DTEND;TZID=Europe/Paris:20210629T120000
DTSTAMP:20210608T103931Z
CREATED:20210608T102447Z
LAST-MODIFIED:20210608T103931Z
UID:21856-1624964400-1624968000@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Ions in motion : Effect of Oscillatory Electric Fields\n\n\n\n \nCarlos Drummond\n\n\n\nCentre de Recherche Paul Pascal (CRPP)\, UPR 8641-CNRS\,\nUniversité de Bordeaux\, Pessac F-33600\, France\n\n\nZoom link : https://espci.zoom.us/j/85635514099?pwd=dHhMVHQxbENRVkc0amxCelg5cEN2Zz09 \nID de réunion : 856 3551 4099\nCode secret : 102958\n \nAbstract: The dynamic response to applied electrical potentials is a topic of fundamental significance in many systems\, from supercapacitors and batteries\, to the understanding of electrokinetics. Many electrokinetic systems of interest involve the application of alternating potentials. In this seminar I will discuss the dynamic response to an applied oscillatory electric field of monovalent salt solutions confined between two walls\, investigated by using a modified Surface Forces Apparatus. In opposition to what could be anticipated from purely electrostatic considerations\, we observed a strong\, slowly evolving repulsive force between surfaces separated by an aqueous electrolyte upon application of an alternating potential difference between the walls. This long-range repulsive force increases with the ratio of diffusion coefficients of the ions in the medium and the square of the applied potential. We argue that the repulsive force is a consequence of the field-induced ionic excess in the gap\, due to ionic transport from adjacent reservoirs. 
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-28/
LOCATION:Visioconférence
CATEGORIES:Séminaire
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DTSTART;TZID=Europe/Paris:20210629T140000
DTEND;TZID=Europe/Paris:20210629T150000
DTSTAMP:20210624T083212Z
CREATED:20210624T083138Z
LAST-MODIFIED:20210624T083212Z
UID:21943-1624975200-1624978800@www.chimieparistech.psl.eu
SUMMARY:Séminaire Programme Gradué Chimie PSL
DESCRIPTION:Tuning Properties and Functionality in the Modulated Self-Assembly of Metal-Organic Frameworks\n\nProf. Ross S. Forgan\nWestCHEM School of Chemistry\, University of Glasgow\n \nOnline on Zoom\nhttps://us02web.zoom.us/j/84312479733?pwd=ZUhSUVh1WFBnQVhRQnJTZmIvVnVzUT09\nMeeting ID: 843 1247 9733\nSecret code: K3nwq9 \n\nMetal-organic frameworks (MOFs) are network materials comprised of organic ligands connected by metal ion clusters into multidimensional structures that often have permanent porosity. Their chemically addressable structures\, combined with their ability to store large quantities of small molecules within their pores\, have led to applications in gas storage\, heterogeneous catalysis\, sensing\, and drug delivery\, amongst others. \nCoordination modulation\, the addition of monomeric modulators to synthetic mixtures\, can tune particle size from nanometres to centimetres\, through capping of crystallites (decreasing size) or coordinative competition with ligands (increasing size). \nThe talk will cover the development of our own modulation techniques for a range of trivalent and tetravalent MOFs\, describing the versatility of modulation in controlling physical properties such as interpenetration\, defectivity\, and porosity.[1] Our techniques provide access to high quality single crystals of many different MOFs\, allowing the subsequent characterisation of their mechanical properties\,[2] flexibility upon guest uptake\,[3] single-crystal to single-crystal postsynthetic modification\,[4] and development of fluorescent sensors.[5] \nAdditionally\, we will show that protocols can be tuned to downsize materials\, producing\nnanoparticles with fine control of surface chemistry\, allowing the assembly of pH-responsive[6]\nand organelle targeted[7] drug delivery devices. \n[1]Marshall\, R. J. et al.\, J. Mater. Chem. A 2018\, 6\, 1181–1187.\n[2]Hobday\, C. L. et al.\, Angew. Chem. Int. Ed. 2016 55\, 2401–2405.\n[3]Marshall\, R. J.; McGuire\, J.; Wilson\, C.; Forgan\, R. S. Supramol. Chem. 2018\, 30\, 124–133.\n[4]Marshall\, R. J.; Griffin\, S. L.; Wilson\, C; Forgan\, R. S. J. Am. Chem. Soc. 2015\, 137\, 9527–9530.\n[5]Marshall\, R. J. et al.\, J. Am. Chem. Soc. 2017\, 139\, 6253–6260; Sussardi\, A. et al.\, Angew. Chem. Int.\nEd. 2020\, 59\, 8118–8122\n[6]Abánades Lázaro\, I. et al.\, Chem 2017\, 2\, 561–578.\n[7]Haddad\, S. et al.\, J. Am. Chem. Soc. 2020\, 142\, 6661–6674.
URL:https://www.chimieparistech.psl.eu/evenement-agenda/seminaire-programme-gradue-chimie-psl-33/
LOCATION:Visioconférence
CATEGORIES:Séminaire
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