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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bacterial cellulose as a template for preparation of hydrotalcite-like compounds

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Author(s):
Perotti, Gustavo F. [1] ; Barud, Hernane S. [2] ; Ribeiro, Sidney J. L. [2] ; Constantino, Vera R. L. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
[2] Univ Estadual Paulista, Inst Quim Araraquara, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 25, n. 9, p. 1647-1655, SEP 2014.
Web of Science Citations: 7
Abstract

Bacterial cellulose (BC) was used as a template for preparation of Hydrotalcite-type compounds or layered double hydroxides (LDHs) by co-precipitation method, and submitted to three aging times. Isolated composites containing LDH supported on BC (BC-LDH) were calcined to remove the organic matrix. Mixed metal oxides formed after thermal decomposition underwent reconstruction reaction in Na2CO3 solution producing again hydrotalcite-like materials (RBC-LDH). To evaluate the influence of BC on the LDH formation, it was also analyzed LDH fractions not attached to the BC fibers and LDH synthesized in absence of the polymeric membrane. XRD pattern of BC-LDH composites show broadened peaks related to the organic semi-crystalline matrix, indicating a deep level of interaction between organic and inorganic phases. Interaction is also evidenced by changes in the composites thermal decomposition profiles compared to pristine polymer. SEM images revealed formation of submicrometrical round-shaped LDH particles after removal of membrane (RBC-LDH), differently from the plate-habit exhibited by pristine LDH. Aging plays a key role in growth of all LDHs samples, leading to the formation of larger inorganic particles as time is increased. RBC-LDH aging for three days shows significant improvement in the surface area (more than three times) if contrasted to LDH prepared in BC absence. (AU)

FAPESP's process: 11/50318-1 - Development of compounds with pharmacological or medicinal interest and of systems for their transport, detection and recognition in biological media
Grantee:Ana Maria da Costa Ferreira
Support Opportunities: Research Projects - Thematic Grants