| | | | | | | webmail : intra-extra| Accès VPN| Accès IST| Contact | Français
Interfacial nanoparticle self-assembly: recent hard X-ray studies
 
Structure of Materials Group, European Synchrotron Radiation Facility
Thu, Mar. 10th 2011, 11:00
NIMBE Bât.125, p.157, CEA-Saclay

The recent spectacular increase of scientific interest in nanoparticle (NP) self-assembly is motivated both by the wide spectrum of current and potential technological applications, and by the fact that NPs can be used as model systems for the investigation of fundamental physical phenomena. New characterization techniques are constantly devised and improved to better probe the structure and dynamics of these systems. Particularly challenging is the nano-structural characterization when the particles self-assemble at deeply buried solid/liquid or liquid/liquid interfaces.

The High-Energy Micro-Diffraction apparatus of the ID15 beamline of the ESRF was originally developed for the study of interfacial ordering phenomena in atomic and molecular systems. We have extended its domain of application into the nanoparticle/colloidal domain with studies of solvent-mediated NP self-assembly processes. 

The core of the talk will deal with hard x-ray reflectivity (XR) studies of surfactant-induced adsorption of silica NPs at buried, flat water/hexane interfaces. A detailed physical modeling of the XR data allows extraction of the average Young-Dupre contact angleθ for the NPs confined to the liquid-liquid interface. The NP interfacial binding energy ΔE, as calculated from the obtained θ values, falls in the expected range. However, our results [1] suggest that the classical ΔE computation may partially lose its accuracy for few-nm-sized particles, at least in the relatively complex NP/surfactant systems investigated here.

If time allows, we will concisely present also recent in-situ grazing-incidence small-angle hard x-ray scattering studies of the evolving nano-structure during gold NP self-assembly at solid surfaces in conditions of controlled solvent evaporation and subsequent controlled nano-scale re-wetting.

[1] D. Calzolari, D. Pontoni, M. Deutsch, H. Reichert, and J. Daillant, in preparation, 2011.


http://www.esrf.eu
Contact : Florent MALLOGGI

 

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