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|Title:||Fractality and metastability of a complex amide cross-linked dipodal alkyl/siloxane hybrid|
|Author(s):||Nunes, S. C.|
Ferreira, C. B.
Ferreira, R. A. S.
Carlos, L. D.
Ferro, M. C.
Mano, J. F.
de Zea Bermudez, V.
|Publisher:||Royal Society of Chemistry|
|Citation:||Nunes S. C., Ferreira C. B., Ferreira R. A. S., Carlos L. D., Ferro M. C., Mano J. F., Almeida P., de Zea Bermudez V. Fractality and metastability of a complex amide cross-linked dipodal alkyl/siloxane hybrid, RSC Advances, Vol. 4, Issue 103, pp. 59664-59675, doi:10.1039/C4RA11300D, 2014|
|Abstract(s):||A novel room-temperature white light emitter amide-cross linked alkyl/siloxane hybrid material (amidosil A) was produced by self-organization through the rational design of the precursor. This hybrid displays a highly complex hierarchical architecture composed of two lamellar bilayer structures, the relative spatial arrangement of which yields a multiplicity of ordered nanodomains with variable shapes and sizes, some of them persisting at the microscale. Macroscopically A was obtained as clusters of hydrophobic hemispherical and spherical micro-objects exhibiting a lettuce coral-like pattern, which represent unprecedented pieces of evidence illustrating the principles of self-similarity and demonstrating that the time scale of biomimetic morphogenesis in this non-bridged silsesquioxane is similar to that in biological systems. Heating metastable A above the order/disorder phase transition acted as an externalquake driving the material to another metastable state, which has persisted for more than 12 months, and was manifested as a marked change of all the macroscopic properties. The occurrence of the self-organization process operating on A, instead of a self-directed assembly, is primarily associated with the formation/rupture of hydrogen bonds, therefore supporting that these interactions are critical factors dictating on what side of the self-assembly/self-organization boundary a non-bridged silsesquioxane system will evolve.|
|Access:||Restricted access (UMinho)|
|Appears in Collections:||3B’s - Artigos em revistas/Papers in scientific journals|
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