book of abstracts - IM2NP

A B S T R A C T S FRIDAY, JULY 2 N A N O S E A 2 0 1 0
intensity, visible light can be used to erase UV-printed micropatterns or photoprint non erasable
microinscriptions in the films. The non erasable patterns are actually engraved in the film: the TiO2 matrix,
initially amorphous, locally crystallizes into an anatase lattice, and depresses, under the focused illumination.
4 – Conclusion
Different monochromatic UV beams are used to print erasable or permanent microinscriptions, depending on
the incident intensity. Various visible laser beams are used to erase the UV printed patterns, or to print
permanent micropatterns, depending on the incident intensity. The reversible character of the erasable
microinscriptions results from the photochromic character of the films whereas the permanent character of
the non erasable microinscriptions is due to an irreversible crystallization of the TiO2 matrix.
References :
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[4] L. Bois, F. Chassagneux, Y. Battie, F. Bessueille, L. Mollet, S. Parola, N. Destouches, N. Toulhoat, N. Moncoffre, Langmuir 2009, DOI:
10.1021/la902339
[5] J. Okumu, C. Dahmen, A. N. Sprafke, M. Luysberg, G. Von Plessen, M. Wuttig, J. Appl. Phys. 2005, 97, 094305-1
9H50-10H10
Influence of Confinement on the Self Assembly of Opto-Electronically Active
Mesostructured Hexagonal Silica.
Avigail Keller and Gitti L. Frey (Department of Materials Engineering, Technion, Haifa 32000, Israel).
avigail@tx.technion.ac.il
1 – Introduction
Mesostructured silica is used in diverse applications including separation technologies, heterogeneous
catalysis, drug release, and photonics. The type of mesophase deposited from sol-gel solutions, i.e lamellar,
cubic or hexagonal, depends on the precursor solution composition, relative humidity and the deposition
technique. The orientation of the mesophases, on the other hand, is determined by the substrate and the
deposition technique, with the 2D phases, i.e. lamellar and hexagonal, generally formed parallel to the
substrate. However, a vertical alignment of the hexagonal mesophase is desirable for many applications.
Deposition of mesostructured silica inside the vertical pores of a porous membrane such as anodic alumina
membrane (AAM) has been shown to induce the desirable vertical alignment of the hexagonal silica.
2 – Abstract
The objective of this research is to deposit photo-active hexagonal silica vertically aligned in porous AAM.
To do so we use a new and general synthetic approach developed in our group for the incorporation of optoelectronically
active guests, conjugated polymers, into the hexagonal silica upon its formation.
The method used for the self assembly of the mesoporous silica/surfactant/conjugated polymer
nanocomposite within the pores of an anodic alumina membrane includes soaking the 60 µm thick
membrane in a modified sol-gel precursor solution including the hydrophobic optically-active organic guest,
in this study a conjugated polymer species. More specifically, the precursor solutions contain THF as the
main solvent, PluronicTM P123 as a structure directing agent, and TEOS as the silica precursor, P123 to
TEOS molar ratios and relative humidity conditions were controlled. After soaking the AAM with the
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