Presented By: Chemical Engineering
ChE Special Seminar: Marie-Paule Pileni
Marie-Paule Pileni
Université Pierre et Marie Curie
Paris, France
"Nanocrystallinity, Supracrystals: Unexpected Behavior"
ABSTRACT: The nanocrystals with low size distribution self assemble in 3D superlattices called supracrystals. The crystalline structure of nanocrystals called nanocrystallinity plays a key role on these self-assemblies Heterogeneous and homogeneous growth processes of supracrystals take place inducing marked changes in their physical properties.
We describe some physical and chemical properties of nanomaterials differing by the crystalline structures called nanocrystallinity: It is demonstrated that nanocrystallinity plays a major role in the final structure when nanocrystals are subjected to oxidation processes (Kinkendall effect). Concerning the optical properties, some processes are markedly affected by the crystalline structure whereas others are negligeable.
“Clustered” and “eggs” structures are hydrophobic supracrystals are dispersed in aqueous solution with a very high stability (almost two years). Solubilization of hydrophobic supracrystal in aqueous solution is obtained with Co and Au supracrystals with appearance of tunable plasmonic metamaterials. With Au supracrystals, the optical properties revealed that the fingerprint of nanocrystal is preserved even for large crystalline aggregates demonstrating that the nanocrystal could be used as a probe for investigating the optical properties of such assemblies.
BIO: Marie-Paule Pileni is a distinguished professor at the Université Pierre et Marie Curie (UPMC). She obtained an honors degree in physical chemistry (1970) and a Ph.D (1977) at the UPMC. She was director, between 1996 and 2000, of the Structure and Reactivity of Interfaces Laboratory (SRI), a Université Pierre et Marie Curie - Centre national de la recherche scientifique (CNRS) joint unit. In 2000, she created the Laboratoire des Matériaux Mésoscopiques et Nanométriques (LM2N) (Mesoscopic and Nanometric Materials Laboratory). Her areas of specialization are nanomaterials self assemblies, colloids, and physical chemistry.
Université Pierre et Marie Curie
Paris, France
"Nanocrystallinity, Supracrystals: Unexpected Behavior"
ABSTRACT: The nanocrystals with low size distribution self assemble in 3D superlattices called supracrystals. The crystalline structure of nanocrystals called nanocrystallinity plays a key role on these self-assemblies Heterogeneous and homogeneous growth processes of supracrystals take place inducing marked changes in their physical properties.
We describe some physical and chemical properties of nanomaterials differing by the crystalline structures called nanocrystallinity: It is demonstrated that nanocrystallinity plays a major role in the final structure when nanocrystals are subjected to oxidation processes (Kinkendall effect). Concerning the optical properties, some processes are markedly affected by the crystalline structure whereas others are negligeable.
“Clustered” and “eggs” structures are hydrophobic supracrystals are dispersed in aqueous solution with a very high stability (almost two years). Solubilization of hydrophobic supracrystal in aqueous solution is obtained with Co and Au supracrystals with appearance of tunable plasmonic metamaterials. With Au supracrystals, the optical properties revealed that the fingerprint of nanocrystal is preserved even for large crystalline aggregates demonstrating that the nanocrystal could be used as a probe for investigating the optical properties of such assemblies.
BIO: Marie-Paule Pileni is a distinguished professor at the Université Pierre et Marie Curie (UPMC). She obtained an honors degree in physical chemistry (1970) and a Ph.D (1977) at the UPMC. She was director, between 1996 and 2000, of the Structure and Reactivity of Interfaces Laboratory (SRI), a Université Pierre et Marie Curie - Centre national de la recherche scientifique (CNRS) joint unit. In 2000, she created the Laboratoire des Matériaux Mésoscopiques et Nanométriques (LM2N) (Mesoscopic and Nanometric Materials Laboratory). Her areas of specialization are nanomaterials self assemblies, colloids, and physical chemistry.
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