NDLI: Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route

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Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route

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Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Zhidong Or, Siu Wing Zhang, Yajing
Copyright Year	2011
Abstract	Three-dimensional (3D) hierarchical cobalt (Co) hyperbranches are synthesized by a sodium tartrate-assisted hydrothermal self-assembly route. The route includes the fabrication of the Co hyperbranches in a solution of cobalt chloride (CoCl2·6H2O) and sodium hydroxide (NaOH) at 110 °C for 24 h using sodium tartrate (Na2C4H4O6·2H2O) as the complex reagent and sodium hypophosphite (NaH2PO2·H2O) as the reducing agent. Each Co hyperbranch is 50–100 μm in length and consists of a main branch with several secondary branches and leaves. The adjustments of the molar ratio of Na2C4H4O6 to CoCl2 and the concentration of NaOH in the solution lead to the formation of the Co products with different morphologies. A possible growth mechanism for the Co hyperbranches is proposed based on the characterization results of X-ray diffraction and scanning electron microscopy. The magnetic hysteresis loops at room temperature of the resulting Co products with different morphologies show ferromagnetic characteristics with high dependence on their sizes and morphologies. An increased coercivity (Hc) of 231 Oe and a reduced saturation magnetization (Ms) of 152 emu/g are observed in the Co hyperbranches compared to their bulk counterpart. This relatively simple, efficient, and morphologically controllable route can be applied to the synthesis of complex 3D micro/nanoarchitectures of other materials.
Starting Page	1287
Ending Page	1293
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	1
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c1ra00387a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sodium tartrate Redox Concentration Cobalt Reagent Water of crystallization Scanning electron microscope Three-dimensional space Sodium hydroxide Sodium hypophosphite X-ray crystallography Self-assembly Hydrothermal circulation Saturation (magnetic) Micrometre Ferromagnetism Cobalt(II) chloride Correlation and dependence Hysteresis
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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