| | | | | | | webmail : intra-extra| Accès VPN| Accès IST| Contact | Français
Ingénierie macromoléculaire appliquée à l'étude de nano-objets à base de nanoparticules inorganiques greffées de polymères.
Géraldine CARROT
Thu, Jul. 12th 2007, 11:00
NIMBE Bât.125, p.157, CEA-Saclay
Nanohybrid objects based on polymer and inorganic nanoparticles are of great interest for different reasons. Indeed, the polymer part can help first for the stability and the organization of the particles, second to increase the amount of chemical functions available in the organic corona and finally to improve or to mask the properties of the particles. SANS is a well-suited technique for the study of these objects particularly due to the possibility to use contrast matching to see either the particle or the polymer corona. Here we are interested in the synthesis of both silica and platinum nanoparticles grafted with polymers or biological molecules which may be used first as models or as probes for biological detection. The method to introduce the polymer consists in using both the “grafting from” technique and controlled radical polymerisation. These systems (mainly in aqueous media) are exempt of free polymers so the characterization via SANS can lead to quantitative data such as the amount of chains in the polymer corona and the chains molecular weight. Contrast matching has been used to see only the polymer chains. Platinum particles have been characterized previously using X-ray diffraction and silica particles are studied in H2O or in the polymer matching index. In both cases, polymerization kinetics was followed by SANS and the polymer corona spectra show a plateau at small q which attests that the objects are individual and well-dispersed. Results obtained from SANS have been compared to other techniques such as NMR or TEM measurements. A good correlation has also been observed with the compression isotherms of Langmuir films obtained directly from the polymer-grafted nanoparticles.

 

Séminaire LIONS - Informations pratiques

Entrée sur le site du CEA de Saclay pour les séminaires LIONS

 

Afin de pouvoir entrer sur le site du CEA de Saclay veuillez adresser les données personnelles suivantes par courriel à David Carrière et Michèle COLIN (secrétariat) un avis d’entrée vous sera alors délivré :

Nom :
Prénom :

Date et lieu de naissance :
Nationalité :

Nom de l'employeur :

Ces informations doivent être envoyées au mieux deux jours avant la date du séminaire.

Lors de votre venue vous devez vous présenter avec une carte d'identité ou un passeport en cours de validité. L'entrée sur le site se fait par l'entrée principale ou porte Nord (suivre le lien ci-dessous), un badge vous y sera remis. Demandez à l'accueil le Bât.125 ils vous renseigneront. Les séminaires se déroulent en pièce 157 (1er étage). En cas de problème vous pouvez contacter le secrétariat au 01.69.08.64.81.



 Formalities for entering the CEA Saclay site for LIONS seminars

 

To enter in CEA Saclay you need to send the following personal data to David Carrière and Michèle COLIN (secretariat):


Last Name :
First Name :

Place and date of birth :
Nationality :

Employer Name :


These informations must be preferably sent at least two days before the seminar date.

When you come you must have a valid ID card or passport with you.

The entrance in CEA Saclay is through the main entrance or north entrance (see link below), a pass will be delivered. Ask at the “accueil” the path for the building 125. LIONS seminars take place in room 157 (first floor).

Any questions/troubles do not hesitate to contact our secretariat: 01.69.08.64.81.

 

Informations:  Access
Contact:  David Carrière

#26 - Last update : 10/10/2012

 

Retour en haut