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      Characterization of magnetic nanoparticle by dynamic light scattering

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          Abstract

          Here we provide a complete review on the use of dynamic light scattering (DLS) to study the size distribution and colloidal stability of magnetic nanoparticles (MNPs). The mathematical analysis involved in obtaining size information from the correlation function and the calculation of Z-average are introduced. Contributions from various variables, such as surface coating, size differences, and concentration of particles, are elaborated within the context of measurement data. Comparison with other sizing techniques, such as transmission electron microscopy and dark-field microscopy, revealed both the advantages and disadvantages of DLS in measuring the size of magnetic nanoparticles. The self-assembly process of MNP with anisotropic structure can also be monitored effectively by DLS.

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          Towards a definition of inorganic nanoparticles from an environmental, health and safety perspective.

          Melanie Auffan, Jérôme Rose, Jean-Yves Bottero … (2009)
          The regulation of engineered nanoparticles requires a widely agreed definition of such particles. Nanoparticles are routinely defined as particles with sizes between about 1 and 100 nm that show properties that are not found in bulk samples of the same material. Here we argue that evidence for novel size-dependent properties alone, rather than particle size, should be the primary criterion in any definition of nanoparticles when making decisions about their regulation for environmental, health and safety reasons. We review the size-dependent properties of a variety of inorganic nanoparticles and find that particles larger than about 30 nm do not in general show properties that would require regulatory scrutiny beyond that required for their bulk counterparts.
          Article 0 comments Cited 366 times – based on 0 reviews     Review now
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            Analysis of Macromolecular Polydispersity in Intensity Correlation Spectroscopy: The Method of Cumulants

            Dennis Koppel (1972)
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              Synthesis of monodisperse spherical nanocrystals.

              Jongnam Park, Jin Joo, Soon Kwon … (2007)
              Much progress has been made over the past ten years on the synthesis of monodisperse spherical nanocrystals. Mechanistic studies have shown that monodisperse nanocrystals are produced when the burst of nucleation that enables separation of the nucleation and growth processes is combined with the subsequent diffusion-controlled growth process through which the crystal size is determined. Several chemical methods have been used to synthesize uniform nanocrystals of metals, metal oxides, and metal chalcogenides. Monodisperse nanocrystals of CdSe, Co, and other materials have been generated in surfactant solution by nucleation induced at high temperature, and subsequent aging and size selection. Monodisperse nanocrystals of many metals and metal oxides, including magnetic ferrites, have been synthesized directly by thermal decomposition of metal-surfactant complexes prepared from the metal precursors and surfactants. Nonhydrolytic sol-gel reactions have been used to synthesize various transition-metal-oxide nanocrystals. Monodisperse gold nanocrystals have been obtained from polydisperse samples by digestive-ripening processes. Uniform-sized nanocrystals of gold, silver, platinum, and palladium have been synthesized by polyol processes in which metal salts are reduced by alcohols in the presence of appropriate surfactants.
              Article 0 comments Cited 288 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                JitKang Lim
                Swee Pin Yeap
                Hui Xin Che
                Siew Chun Low
                Journal
                Journal ID (nlm-ta): Nanoscale Res Lett
                Journal ID (iso-abbrev): Nanoscale Res Lett
                Title: Nanoscale Research Letters
                Publisher: Springer
                ISSN (Print): 1931-7573
                ISSN (Electronic): 1556-276X
                Publication date Collection: 2013
                Publication date (Electronic): 8 September 2013
                Volume: 8
                Issue: 1
                Page: 381
                Affiliations
                [1 ]School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, 14300, Malaysia
                [2 ]Department of Physics, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
                Article
                Publisher ID: 1556-276X-8-381
                DOI: 10.1186/1556-276X-8-381
                PMC ID: 3846652
                PubMed ID: 24011350
                SO-VID: 18f1f48b-b0e1-4561-8cc7-283898dab330
                Copyright © Copyright © 2013 Lim et al.; licensee Springer.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 7 August 2013
                Date accepted : 30 August 2013
                Categories
                Subject: Nano Review

                ScienceOpen disciplines: Nanomaterials
                Keywords: dynamic light scattering,magnetic nanoparticles,colloidal stability,surface functionalization,review
                Data availability:
                ScienceOpen disciplines: Nanomaterials
                Keywords: dynamic light scattering, magnetic nanoparticles, colloidal stability, surface functionalization, review

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