The Influence of Arylene and Alkylene Units on the Structuring of Urea-Based Bridged Silsesquioxanes

2012 ◽  
Vol 2012 (32) ◽  
pp. 5312-5322 ◽  
Author(s):  
Benoît P. Pichon ◽  
Sylvana Scampini ◽  
Catherine Bied ◽  
Joël J. E. Moreau ◽  
Michel Wong Chi Man
Keyword(s):  
Bridged Silsesquioxanes

Influence of Alkylene Chain Length on the Morphology of Chiral Bridged Silsesquioxanes

2004 ◽  
Vol 32 (1-3) ◽  
pp. 111-115 ◽  
Author(s):  
Xu Qinghong ◽  
Jo�l J. E. Moreau ◽  
Michel Wong Chi Man
Keyword(s):  
Chain Length ◽  
Bridged Silsesquioxanes

Photoluminescence of Eu(iii)-doped lamellar bridged silsesquioxanes self-templated through a hydrogen bonding array

2008 ◽  
Vol 18 (35) ◽  
pp. 4172 ◽  
Author(s):  
Sónia S. Nobre ◽  
Carlos D. S. Brites ◽  
Rute A. S. Ferreira ◽  
Verónica de Zea Bermudez ◽  
Carole Carcel ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Bridged Silsesquioxanes

Efficient spectrally dynamic blue-to-green emission of bipyridine-based bridged silsesquioxanes for solid-state lighting

2010 ◽  
Vol 4 (3-4) ◽  
pp. 55-57 ◽  
Author(s):  
Sónia S. Nobre ◽  
Xavier Cattoën ◽  
Rute A. S. Ferreira ◽  
Michel Wong Chi Man ◽  
Luis D. Carlos
Keyword(s):  
Solid State ◽  
Green Emission ◽  
Solid State Lighting ◽  
Bridged Silsesquioxanes

Preparation And Characterization Of Ultra-Small Sized Metal And Semiconductor Particles In Sol-Gel Materials

1994 ◽  
Vol 346 ◽  
Author(s):  
Kyung Moon Choi ◽  
Kenneth J. Shea
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
Sol Gel ◽  
High Vacuum ◽  
Particle Sizes ◽  
Transition Metal Clusters ◽  
Surface Areas ◽  
Sol Gel Process ◽  
Bridged Silsesquioxanes

ABSTRACTPoly(l,4-phenylene)-bridged and poly(1,6-hexylene)-bridged silsesquioxanes (PPS and HPS) were prepared by the sol-gel process. The surface areas and pore diameters of these porous xerogels were obtained by BET and BJH methods, respectively. These porous materials were used as a confinement matrix for the growth of small-sized semiconductor and transition metal clusters. Quantum-sized CdS particles in PPS (approximately 58+12 Â) and HPS (91+16 Â) matrices were prepared by first soaking the xerogel in a CdCl2 solution. Following a washing with water, a Na2S solution was then added. EDAX and electron diffraction techniques were used to identify the CdS particles. The particle sizes of CdS in PPS and HPS were determined by both UV measurements and from TEM images. Small-sized Cr clusters were prepared in dried xerogels by an internal doping method. Mixed Cr/CdS phases were also prepared by internal loading of a chromium metal precursor. Following deposition of CdS the xerogel was heated at 120 °C under high vacuum, resulting in formation of intimately mixed phases of Cr metal and CdS. Changes in morphology, in particular the surface area and pore size distribution were noted. A decrease in surface area and an increase in pore size were observed as a result of Cr metal deposition.

scholarly journals Novel Highly Luminescent Amine-Functionalized Bridged Silsesquioxanes

2018 ◽  
Vol 5 ◽  
Author(s):  
Rui F. P. Pereira ◽  
Sílvia C. Nunes ◽  
Guillaume Toquer ◽  
Marita A. Cardoso ◽  
Artur J. M. Valente ◽  
...  
Keyword(s):  
Amine Functionalized ◽  
Bridged Silsesquioxanes

Eu3+-Based Bridged Silsesquioxanes for Transparent Luminescent Solar Concentrators

2015 ◽  
Vol 7 (16) ◽  
pp. 8770-8778 ◽  
Author(s):  
Vânia. T. Freitas ◽  
Lianshe Fu ◽  
Ana M. Cojocariu ◽  
Xavier Cattoën ◽  
John R. Bartlett ◽  
...  
Keyword(s):  
Solar Concentrators ◽  
Luminescent Solar Concentrators ◽  
Bridged Silsesquioxanes

Photoluminescence Changes Induced by Self-Organisation in Bridged Silsesquioxanes

2006 ◽  
Vol 514-516 ◽  
pp. 118-122 ◽  
Author(s):  
Luís D. Carlos ◽  
Rute A. Sá Ferreira ◽  
Sonia S. Nobre ◽  
Michel Wong Chi Man ◽  
Joël J. E. Moreau ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Long Range ◽  
Local Structure ◽  
The Self ◽  
Time Resolved ◽  
Emission Properties ◽  
Self Assembling ◽  
Molecular Precursor ◽  
Long Range Ordering ◽  
Bridged Silsesquioxanes

Two organo-bridged silsequioxanes derived from the same molecular precursor were synthesized with completely different local structure, namely long-range ordering. The photoluminescence features (emission, excitation, and time-resolved modes) were studied in the temperature range 13-300 K and compared with those of the molecular precursor. The effects of the self-assembling of the nanobuild blocks on these emission properties were discussed in terms of the magnitude of the hydrogen bonds between adjacent organic groups.

Nanostructuring of Ionic Bridged Silsesquioxanes

2013 ◽  
Vol 8 (9) ◽  
pp. 2235-2241 ◽  
Author(s):  
Amàlia Monge-Marcet ◽  
Xavier Cattoën ◽  
Philippe Dieudonné ◽  
Roser Pleixats ◽  
Michel Wong Chi Man
Keyword(s):  
Bridged Silsesquioxanes

Preparation of n-type semiconducting polymer nanoarrays by covalent synthesis followed by crystallization

2015 ◽  
Vol 39 (3) ◽  
pp. 2004-2010 ◽  
Author(s):  
Begum Fouzia ◽  
John Ferguson ◽  
Kelly McKenna ◽  
Louis E. McNamara ◽  
Nathan I. Hammer ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Chain ◽  
Semiconducting Polymer ◽  
Solution Crystallization ◽  
Photophysical Behavior ◽  
Bridged Silsesquioxanes ◽  
Chain Ordering

N-type semiconducting polymer nanoarrays derived from poly(perylenediimide-bridged silsesquioxanes) were prepared by in situ covalent synthesis followed by solution crystallization. Their crystallinity and polymer chain ordering support their photophysical behavior in solid state.

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