[Interactions entre billes recouvertes de polyélectrolytes et vésicules phospholipidiques]
Des particules colloı̈dales recouvertes de multicouches de polyélectrolytes alternativement positives et negatives interacgissent fortement avec des vésicules lipidiques. Nous avons étudié deux cas : (i) interactions entre des billes et des vésicules unilamellaires de taille plus petite que celle des billes, où nous avons mis en évidence un recouvrement des billes par une ou plusieurs bicouches lipidiques, par le biais d'une augmentation du diamètre des billes et de changements de leur potentiel de surface ; (ii) interactions entre des billes et des vésicules géantes (plus grandes que les billes) où nous avons observé, par microscopie de fluorescence, l'étalement d'une vésicule sur une bille (cette dernière étant manipulée à l'aide d'une pince optique). Dans ce dernier cas, les fluctuations géantes de la vésicule sont supprimées à cause de l'adhésion sur la bille, et l'observation directe du recouvrement lors du processus d'étalement montre que la couverture lipidique de la bille n'est pas limitée seulement à la zone de contact bille/vésicule, s'étend à la bille entière.
Colloidal particles coated by polyelectrolyte multilayers of alternatingly positive and negative charge are shown to interact strongly with lipid vesicles. We have studied two cases: (i) the interaction between beads and small unilamellar vesicles (vesicles diameter smaller than the particles one), where we found evidence for coating of the beads with lipid bi- or multilayers in the form of an increase in bead diameter and changes in the beads surface potential; (ii) the interaction of beads with giant vesicles (vesicles larger than the particles), where we observed by fluorescence microscopy the spreading of the vesicle on the bead manipulated with an optical tweezer. Giant fluctuations of the vesicles are suppressed due to the adhesion of the vesicle to the bead and direct observation of the coating process shows that lipid coverage is not limited to the direct vesicle-bead contact area, but is rather extended to the entire bead.
Mot clés : Adhésion, Membranes, Polyélectrolytes, Particules, Mouillage
Andreas Fery 1 ; Sergio Moya 2 ; Pierre-Henri Puech 3 ; Françoise Brochard-Wyart 3 ; Helmuth Mohwald 1
@article{CRPHYS_2003__4_2_259_0,
author = {Andreas Fery and Sergio Moya and Pierre-Henri Puech and Fran\c{c}oise Brochard-Wyart and Helmuth Mohwald},
title = {Interaction of polyelectrolyte coated beads with phospholipid vesicles},
journal = {Comptes Rendus. Physique},
pages = {259--264},
publisher = {Elsevier},
volume = {4},
number = {2},
year = {2003},
doi = {10.1016/S1631-0705(03)00030-6},
language = {en},
}
TY - JOUR AU - Andreas Fery AU - Sergio Moya AU - Pierre-Henri Puech AU - Françoise Brochard-Wyart AU - Helmuth Mohwald TI - Interaction of polyelectrolyte coated beads with phospholipid vesicles JO - Comptes Rendus. Physique PY - 2003 SP - 259 EP - 264 VL - 4 IS - 2 PB - Elsevier DO - 10.1016/S1631-0705(03)00030-6 LA - en ID - CRPHYS_2003__4_2_259_0 ER -
%0 Journal Article %A Andreas Fery %A Sergio Moya %A Pierre-Henri Puech %A Françoise Brochard-Wyart %A Helmuth Mohwald %T Interaction of polyelectrolyte coated beads with phospholipid vesicles %J Comptes Rendus. Physique %D 2003 %P 259-264 %V 4 %N 2 %I Elsevier %R 10.1016/S1631-0705(03)00030-6 %G en %F CRPHYS_2003__4_2_259_0
Andreas Fery; Sergio Moya; Pierre-Henri Puech; Françoise Brochard-Wyart; Helmuth Mohwald. Interaction of polyelectrolyte coated beads with phospholipid vesicles. Comptes Rendus. Physique, Volume 4 (2003) no. 2, pp. 259-264. doi : 10.1016/S1631-0705(03)00030-6. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(03)00030-6/
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