Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc

Paris, France

Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc

Paris, France

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Babinot J.,CNRS East Paris Institute of Chemistry and Materials Science | Renard E.,CNRS East Paris Institute of Chemistry and Materials Science | Le Droumaguet B.,CNRS East Paris Institute of Chemistry and Materials Science | Guigner J.-M.,Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc | And 4 more authors.
Macromolecular Rapid Communications | Year: 2013

In this paper, a straightforward method to produce poly(3-hydroxyalkanoate) -based multicompartment micelles (MCMs) is presented. Thiol-ene addition is used to graft sequentially perfluorooctyl chains and poly(ethylene glycol) oligomers onto poly(3-hydroxyoctanoate-co-hydroxyundecenoate) oligomers backbone. Well-defined copolymers are obtained as shown by 1H NMR and size-exclusion chromatography. After nanoprecipitation in water, novel PHA-based MCMs are evidenced by cryo-transmission electron microscopy. Moreover, the cytocompatibility of MCMs is demonstrated in vitro via cell viability assay. A simple and straightforward method to produce poly(3-hydroxyalkanoate)-based (PHA) multicompartment micelles is presented. Thiol-ene addition is used to efficiently synthesize perfluorooctyl and poly(ethylene glycol)-grafted PHA. These copolymers are shown to self-assemble into multicompartment micelles upon nanoprecipitation in water by cryo-transmission electron microscopy. Moreover, their in vitro cytocompatibility is investigated. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Danet F.,Style Gems in Antsirabe | Schoor M.,National Institute of Gemology ING | Boulliard J.-C.,University Pierre and Marie Curie | Neuville D.,French National Center for Scientific Research | And 2 more authors.
Gems and Gemology | Year: 2012

In January 2012, aquamarine crystals containing interesting inclusions were extracted from the Ambatofotsikely area northwest of Antsirabe, Madagascar. These specimens displayed various types of eye-visible and microscopic inclusions, and some had an unusual form. Raman microspectroscopy identified reddish brown plate lets as hematite, while ilmenite was found as black platelets, black needles, and distinctive dark gray dendrites. Similar inclusions are known in beryl from Brazil, India, Mozambique, and Sri Lanka. © 2012 Gemological Institute of America.


Babinot J.,CNRS East Paris Institute of Chemistry and Materials Science | Guigner J.-M.,Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc | Renard E.,CNRS East Paris Institute of Chemistry and Materials Science | Langlois V.,CNRS East Paris Institute of Chemistry and Materials Science
Journal of Colloid and Interface Science | Year: 2012

In this article, we report the first micellization study of amphiphilic copolymers composed of bacterial medium chain length poly(3-hydroxyalkanoates) (mcl-PHAs). A series of diblock copolymers based on fixed poly(ethylene glycol) (PEG) block (5000gmol -1) and a varying poly(3-hydroxyoctanoate-co-3-hydroxyhexanoate) (PHOHHx) segment (1500-7700gmol -1) have been synthesized using " click" chemistry. These copolymers self-assembled to form micelles in aqueous media. The influence of PHOHHx block molar mass on the hydrodynamic size and on the critical micelle concentration (CMC) has been studied using dynamic light scattering and fluorescence spectroscopy, respectively. With increasing PHOHHx length, narrowly distributed micelles with diameters ranging from 44 to 90nm were obtained, with extremely low CMC (up to 0.85mg/L). Cryogenic transmission electron microscopy (Cryo-TEM) showed that micelles took on a spherical shape and exhibited narrow polydispersity. Finally, the colloidal stability of the micelles against physiological NaCl concentration has been demonstrated, suggesting they are promising candidates for drug delivery applications. © 2012 Elsevier Inc.


Babinot J.,CNRS East Paris Institute of Chemistry and Materials Science | Guigner J.-M.,Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc | Renard E.,CNRS East Paris Institute of Chemistry and Materials Science | Langlois V.,CNRS East Paris Institute of Chemistry and Materials Science
Chemical Communications | Year: 2012

Amphiphilic graft copolymers composed of biocompatible bacterial poly(3-hydroxyalkanoate) and poly(ethylene glycol) have been synthesized by thiol-ene addition. They were demonstrated to form well-defined nanoscale vesicles in water by cryo-transmission electron microscopy. © 2012 The Royal Society of Chemistry.


Guyot F.,CNRS Paris Institute of Global Physics | Guyot F.,Institute Of Mineralogie Et Of Physique Des Milieux Condenses Impmc | Daval D.,CNRS Paris Institute of Global Physics | Daval D.,CNRS ENS Geology Laboratory | And 7 more authors.
Comptes Rendus - Geoscience | Year: 2011

Geological storage of carbon dioxide (CO2) is one of the options envisaged for mitigating the environmental consequences of anthropogenic CO2 increases in the atmosphere. The general principle is to capture carbon dioxide at the exhaust of power plants and then to inject the compressed fluid into deep geological formations. Before implementation over large scales, it is necessary to assess the efficiency of the process and its environmental consequences. The goal of this paper is to discuss some environmental mineralogy research perspectives raised by CO2 geological storage.

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