%0 Journal Article %1 RN362 %A Diaz, C. %A Valenzuela, M.L. %A Laguna-Bercero, M.A. %A Orera, A. %A Bobadilla, D. %A Abarca, S. %A Pena, O. %D 2017 %J Rsc Advances %K chemistry, chitosan, co3o4 crystal-structure, decomposition, dqcauchile gold nanocomposites, nanocrystals, nanoparticles, size, supracrystals %N 44 %P 27729-27736 %R 10.1039/c7ra00782e %T Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors %U /brokenurl#<Go to ISI>://WOS:000402166600064 %V 7 %X The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.

@article{RN362, abstract = {The simple reaction of chitosan with metallic salts yields (chitosan) (MLn)(x), MLn = MnCl2, CoCl2, NiCl2, macromolecular complexes which, after a thermal treatment at 800 degrees C under air, give nanostructured Mn2O3, Co3O4 and NiO. The polymer acts as a template in the solid state, which is eliminated after the combustion process. At an intermediate stage, a layered graphitic carbon matrix was observed by HRTEM over the grown metal oxides. A mechanism for the growth of nanostructured oxides is discussed, including Raman studies. The nanostructured Mn2O3, Co3O4 and NiO particles grow over graphite layers and the solid-state role of chitosan is crucial for the formation of this graphite substrate. An antiferromagnetic transition was observed in Co3O4 nanoparticles, with T-N = 38 K, whereas NiO nanoparticles behave as a superparamagnetic material with a blocking temperature above 300 K.}, added-at = {2019-12-04T03:57:35.000+0100}, author = {Diaz, C. and Valenzuela, M.L. and Laguna-Bercero, M.A. and Orera, A. and Bobadilla, D. and Abarca, S. and Pena, O.}, biburl = {https://www.bibsonomy.org/bibtex/2e36969a24b0a75e064daf4dcb6c21d54/dqcauchile}, doi = {10.1039/c7ra00782e}, interhash = {23b18ad01d93d1b30175150846371713}, intrahash = {e36969a24b0a75e064daf4dcb6c21d54}, issn = {2046-2069}, journal = {Rsc Advances}, keywords = {chemistry, chitosan, co3o4 crystal-structure, decomposition, dqcauchile gold nanocomposites, nanocrystals, nanoparticles, size, supracrystals}, number = 44, pages = {27729-27736}, timestamp = {2019-12-04T03:58:17.000+0100}, title = {Synthesis and Magnetic Properties of Nanostructured Metallic Co, Mn and Ni Oxide Materials Obtained from Solid-State Metal-Macromolecular Complex Precursors}, type = {Journal Article}, url = {/brokenurl#<Go to ISI>://WOS:000402166600064}, volume = 7, year = 2017 }