Preparation and magnetic characterization of core–shell structure stainless steel/silica nanoparticles |
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| Affiliation: | 1. National Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China;2. College of Chemistry, Jilin University, Changchun 130023, PR China;3. Henan Polytechnic University, Jiaozuo 454000, PR China;1. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Daehak-dong, Gwanak-gu, Seoul 151-744, Republic of Korea;2. Department of Metallurgical Engineering, Yonsei University, Shinchon-dong 134, Seodaemun-gu, Seoul, Republic of Korea;1. University of Pennsylvania, 3451 Walnut Street, Philadelphia, PA 19104, USA;2. Research and Development Department, Central Institute of Plastics Engineering and Technology (CIPET), 630, Phase IV, GIDC, Vatva, Ahmedabad 382445, India;3. Department of Chemistry, Hannam University, 461-6 Jeon min-dong, Yuseoung-gu, Daejeon 305-811, South Korea;1. Center of High Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. Advanced Research Center of Central South University, Changsha 410083, China;3. College of Science, National University of Defense Technology, Changsha 410073, China;1. Department of Chemistry, Surana College, South End Road, Basavanagudi, Bengaluru 560004, India;2. Department of Chemistry, CHRIST (Deemed to be University), Bengaluru 560029, India;3. Department of Sciences and Humanities, School of Engineering and Technology, CHRIST (Deemed to be University), Kumbalagodu, Mysore Road, Bengaluru 560074, India |
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| Abstract: | SiO2-coated martensite stainless steel nanoparticles were prepared using wire electrical explosion technique combined with sol–gel technique, and their structural and magnetic properties were studied. The coating silica on stainless steel nanoparticles was based on the use of silane coupling agent 3-mercaptopropyltrimethoxysilane (HS-(CH2)3Si(OCH3)3, MPTS) as a primer to render the stainless steel surface vitreophilic, thus rendering stainless steel surface compatible with silica. The control over the silica coating layer thickness can be achieved by varying the reaction time. For stainless steel nanoparticles, their saturation and remnant magnetizations decreased upon silica coating, and their saturation magnetizations obviously decreased with increasing the thickness of SiO2 coating layer. These stainless steel/silica core–shell nanoparticles can be utilized as precursors for making property-tunable magnetic nanoparticles, thin films, and multilayered core–shell structure nanocomposites. |
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