Journal
RSC ADVANCES
Volume 4, Issue 2, Pages 996-1003Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra44982c
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Funding
- Grant Agency of the Czech Republic [202/09/1626]
- Operational Programme 'Education for Competitiveness'
- European Social Fund (ESF)
- national budget of the Czech Republic, within the project 'Advanced Theoretical and Experimental Studies of Polymer Systems' [CZ. 1.07/2.3.00/20.0104]
- Operational Programme 'Research and Development for Innovations'
- European Regional Development Fund (ERDF)
- national budget of the Czech Republic, within the 'Centre of Polymer Systems' project [CZ. 1.05/2.1.00/03.0111]
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The overall stability (thermo-oxidation, sedimentation) of MR suspensions is a crucial problem decreasing their potential applicability in real life. In this study the unique functional coating of carbonyl iron (CI) particles with ZnO structures was presented in order to develop a new MR suspension based on the core-shell ZnO/CI urchin-like dispersed particles. The two-step synthesis provides the suitable core-shell particles with improved sedimentation and also thermo-oxidation stability. Moreover, due to the enhanced sedimentation stability core-shell based suspensions exhibit higher values of the yield stress than those of bare CI based suspensions at 20 wt% particle concentration. The suspension with 60 wt% particle concentration reaches values of the yield stress around 2.2 kPa at 272 mT. The excellent MR efficiency of the core-shell ZnO/CI based suspension at elevated temperatures was observed. Finally, the dimorphic particle based suspension was prepared when the ratio between the carbonyl iron and core-shell urchin-like particles was 1 : 1. The highest yield stress was obtained in the case of a dimorphic particle-based suspension due to the good magnetic properties of the bare carbonyl iron and mechanical gripping between core-shell ZnO/CI urchin-like particles.
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