Stirring in Suspension: Nanometer-Sized Magnetic Stir Bars†
Wen Han Chong
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorLip Ket Chin
School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
Search for more papers by this authorRachel Lee Siew Tan
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorHong Wang
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorProf. Ai Qun Liu
School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
Search for more papers by this authorCorresponding Author
Prof. Hongyu Chen
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/Search for more papers by this authorWen Han Chong
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorLip Ket Chin
School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
Search for more papers by this authorRachel Lee Siew Tan
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorHong Wang
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Search for more papers by this authorProf. Ai Qun Liu
School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
Search for more papers by this authorCorresponding Author
Prof. Hongyu Chen
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/
Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371 (Singapore) http://www.ntu.edu.sg/home/hongyuchen/Search for more papers by this authorWe thank the NRF of Singapore (CRP-4-2008-06) for financial support.
Graphical Abstract
Stirred, not shaken: Single-line chains of 40 nm Fe3O4 nanoparticles can be used as the world's smallest magnetic stir bars. Their synthesis is facile and scalable. They can be introduced into picoliter emulsion droplets and turned effectively using a commercial magnetic stir plate. Because of their small size, they can resist sedimentation under gravitational and magnetic forces, thus allowing them to remain suspended and stir all parts of the solution.
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