| Full text | |
| Author(s): Show less - |
Santos, Moliria V.
[1]
;
Pecoraro, Edison
[1]
;
Santagneli, Silvia H.
[1]
;
Moura, Andre L.
[2]
;
Cavicchioli, Mauricio
[1]
;
Jerez, Vladimir
[3]
;
Rocha, Lucas A.
[4]
;
de Oliveira, Luiz Fernando C.
[5]
;
Gomes, Anderson S. L.
[6]
;
de Araujo, Cid B.
[6]
;
Ribeiro, Sidney J. L.
[1]
Total Authors: 11
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Inst Chem, BR-14801970 Araraquara, SP - Brazil
[2] Univ Fed Alagoas, Nucleo Ciencias Exatas NCEx, Campus Arapiraca, BR-57309005 Arapiraca, AL - Brazil
[3] Univ Invest & Desarrollo, Grp Invest FIELDS, Bucaramanga - Colombia
[4] Franca Univ UNIFRAN, CP 82, BR-14404600 Franca, SP - Brazil
[5] Univ Fed Juiz De Fora, Ctr Estudos Mat, Nucleo Espect & Estrut Mol, Juiz De Fora, MG - Brazil
[6] Univ Fed Pernambuco UFPE, Dept Fis, BR-50670901 Recife, PE - Brazil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | JOURNAL OF MATERIALS CHEMISTRY C; v. 6, n. 11, p. 2712-2723, MAR 21 2018. |
| Web of Science Citations: | 8 |
| Abstract | |
Bombyx mori silk fibroin offers unlimited opportunities for functionalization, processing, and biological integration. We describe in this work the design of structured organic inorganic hybrids based on silica and silk fibroin, taking advantage of the relationship between the structure and processing of the latter. In situ self-assembly of fibroin nanofibers along with hydrolysis and polycondensation of tetraethyl orthosilicate was employed. Structural characterization was performed by Raman and solid state NMR spectroscopies. Our findings demonstrated that fibroin precipitates in the reaction medium with prevailing beta-sheet conformation. The transition from amorphous to crystalline state was observed to be favored by the increase of the fibroin concentration in the samples. The samples were obtained as robust and biocompatible monoliths, making them candidates for several applications, particularly in the biomedical field. As a novel development, the fibroin nanofibers were used as pore biotemplates to create mechanically robust silica monoliths with a hierarchical macro-mesoporous network in an easy templating process. The template was removed by thermal treatment and the as obtained silica based materials displayed surface area values ranging from 704 to 1057 m(2) g(-1) and a maximum pore volume of 0.621 mL g(-1). The porous silica monoliths were then doped with rhodamine 6G and typical random laser action could be observed, with a minimum laser threshold of 9.7 mu J per pulse and a linewidth narrowing from 40 to 4 nm. In addition, it was shown that two coupled gain mechanisms were taking place, the random lasing and the stimulated Raman scattering, allowing us to observe Raman Stokes lines due to vibrational modes of the dye molecule. (AU) | |
| FAPESP's process: | 14/12424-2 - Optical properties of colloidal suspensions and films based on nanocelluloses and lanthanides |
| Grantee: | Moliria Vieira dos Santos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 16/11591-8 - Femtosecond laser micro-structuring in biopolymers of celulose and fibroin: fabrication of photonic devices |
| Grantee: | Moliria Vieira dos Santos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |