Journal ArticleDOI
Partial Oxidation as a Rational Approach to Kinetic Control in Bioinspired Magnetite Synthesis
Cem L. Altan,Cem L. Altan,Jos J. M. Lenders,Paul H. H. Bomans,Heiner Friedrich,Seyda Bucak,Nico A. J. M. Sommerdijk +6 more
TLDR
Stable suspensions of nanocrystals are achieved that show remanence and coercivity at the size limit of superparamagnetism, and which are able to align their magnetic moments forming strings in solution as is demonstrated by cryo-electron tomography.Abstract:
Biological systems show impressive control over the shape, size and organization of mineral structures, which often leads to advanced physical properties that are tuned to the function of these materials. Such control is also found in magnetotactic bacteria, which produce-in aqueous medium and at room temperature-magnetite nanoparticles with precisely controlled morphologies and sizes that are generally only accessible in synthetic systems with the use of organic solvents and/or the use of high-temperature methods. The synthesis of magnetite under biomimetic conditions, that is, in water and at room temperature and using polymeric additives as control agents, is of interest as a green production method for magnetic nanoparticles. Inspired by the process of magnetite biomineralization, a rational approach is taken by the use of a solid precursor for the synthesis of magnetite nanoparticles. The conversion of a ferrous hydroxide precursor, which we demonstrate with cryo-TEM and low-dose electron diffraction, is used to achieve control over the solution supersaturation such that crystal growth can be regulated through the interaction with poly-(α,β)-dl-aspartic acid, a soluble, negatively charged polymer. In this way, stable suspensions of nanocrystals are achieved that show remanence and coercivity at the size limit of superparamagnetism, and which are able to align their magnetic moments forming strings in solution as is demonstrated by cryo-electron tomography.read more
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Book
Annual review of materials research
Samuel I. Stupp,Richard Lesar,Klaus-Dieter Kreuer,Evelyn L. Hu,John M. Thomas,Venkatraman Gopalan,David R. Clarke,Manfred Rühle,Antoni P. Tomsia,Roger H. French,Thomas M. Shaw,Frank W. Zok,Peter Fratzl,David N. Seidman +13 more
Journal ArticleDOI
Investigating materials formation with liquid-phase and cryogenic TEM
TL;DR: The recent advent of liquid-phase transmission electron microscopy (TEM) and advances in cryogenic TEM are transforming our understanding of the physical and chemical mechanisms underlying the formation of materials in synthetic, biological and geochemical systems.
Journal ArticleDOI
Bioinspired synthesis of magnetite nanoparticles
TL;DR: The most common routes to synthesize magnetite are described, and the use of poorly ordered, more soluble precursors such as ferrihydrite or white rust can be employed to control the solution supersaturation, setting the conditions for continued growth.
Journal ArticleDOI
Crystallization by particle attachment is a colloidal assembly process.
Giulia Mirabello,Alessandro Ianiro,Paul H. H. Bomans,Takuto Yoda,Atsushi Arakaki,Heiner Friedrich,Nico A. J. M. Sommerdijk,Nico A. J. M. Sommerdijk +7 more
TL;DR: The kinetics and thermodynamics of the nucleation of magnetite crystals from primary particles are shown to be described by colloidal assembly theory, allowing for predictions of crystal sizes to be made.
Journal ArticleDOI
In situ mechanical reinforcement of polymer hydrogels via metal-coordinated crosslink mineralization.
Sungjin Kim,Abigail U. Regitsky,Jake Song,Jan Ilavsky,Gareth H. McKinley,Niels Holten-Andersen +5 more
TL;DR: It is shown that inter-molecular metal-ion coordination complexes can serve as mineral nucleation sites, whereby significant mechanical reinforcement is achieved upon nanoscale particle growth directly at the metal-coordinate network crosslink sites.
References
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Magnetic Iron Oxide Nanoparticles: Synthesis and Surface Functionalization Strategies
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Journal ArticleDOI
Bone structure and formation: A new perspective
Matthew J. Olszta,Xingguo Cheng,Xingguo Cheng,Sang Soo Jee,Rajendra Kumar,Rajendra Kumar,Yi-Yeoun Kim,Michael J. Kaufman,Elliot P. Douglas,Laurie B. Gower +9 more
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