Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-25T15:13:12.624Z Has data issue: false hasContentIssue false
  • English
  • Français

Hermetically Coated Nanosilver: No Ag+ Ion Leaching

Published online by Cambridge University Press:  01 March 2012

G. Sotiriou ,
S. Gass  and
S.E. Pratsinis
G. Sotiriou
Affiliation:
ETH Zurich (Swiss Federal Institute of Technology), Department of Process and Mechanical Engineering, Particle Technology Laboratory, Sonneggstrasse 3, 8092 Zurich, Switzerland
S. Gass
Affiliation:
ETH Zurich (Swiss Federal Institute of Technology), Department of Process and Mechanical Engineering, Particle Technology Laboratory, Sonneggstrasse 3, 8092 Zurich, Switzerland
S.E. Pratsinis
Affiliation:
ETH Zurich (Swiss Federal Institute of Technology), Department of Process and Mechanical Engineering, Particle Technology Laboratory, Sonneggstrasse 3, 8092 Zurich, Switzerland
Get access

Abstract

Dry-coated nanosilver is a promising material for bio-applications. Its inert and non-porous nanothin SiO2 coating preserves the plasmonic properties of the nanosilver and cures its toxicity by (1) preventing direct cell to silver contact and (2) blocking the release of toxic silver ions. However, fully hermetic coatings have, to date, not been produced. During the coating process, a certain number of core particles are either coated only partially, or escape the coating process entirely. Here, a systematic parametric study was undertaken in order to optimize an aerosol reactor for the synthesis and dry-coating of nanosilver. The reactor was optimized with respect to coating injection height, jet number, mixing flow rate. By synthesizing xAg/SiO2 composite particles, small silver sizes (9-11 nm) with relatively high Ag ion release were obtained. This enabled the quantitative evaluation of the coatings by Ag ion release measurements.

Keywords

Agparticulatenanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1386: Symposium D – Sustainable Synthesis of Nanomaterials , 2012 , mrsf11-1386-d09-24
Copyright
Copyright © Materials Research Society 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Buesser, B. and Pratsinis, S. E., “Design of gas-phase synthesis of core-shell particles by computational fluid–aerosol dynamics,” AIChE Journal, vol. in press, pp. n/a-n/a, 2011.Google Scholar
[2] Teleki, A., Heine, M. C., Krumeich, F., Akhtar, M. K., and Pratsinis, S. E., “In situ coating of flame-made TiO2 particles with nanothin SiO2 films,” Langmuir, vol. 24, pp. 12553–12558, Nov 2008.Google Scholar
[3] Braun, J. H., Baidins, A., and Marganski, R. E., “TIO2 PIGMENT TECHNOLOGY - A REVIEW,” Progress in Organic Coatings, vol. 20, pp. 105–138, 1992.Google Scholar
[4] Teleki, A., Suter, M., Kidambi, P. R., Ergeneman, O., Krumeich, F., Nelson, B. J., and Pratsinis, S. E., “Hermetically coated superparamagnetic Fe2O3 particles with SiO2 nanofilms,” Chemistry of Materials, vol. 21, pp. 2094–2100, May 2009.Google Scholar
[5] Liz-Marzan, L. M., Giersig, M., and Mulvaney, P., “Synthesis of nanosized gold-silica core-shell particles,” Langmuir, vol. 12, pp. 4329–4335, Sep 1996.Google Scholar
[6] Sotiriou, G. A., Hirt, A. M., Lozach, P. Y., Teleki, A., Krumeich, F., and Pratsinis, S. E., “Hybrid, Silica-Coated, Janus-like Plasmonic-Magnetic Nanoparticles,” Chemistry of Materials, vol. 23, pp. 1985–1992, 2011.Google Scholar
[7] Wank, J. R., George, S. M., and Weimer, A. W., “Coating fine nickel particles with Al2O3 utilizing an atomic layer deposition-fluidized bed reactor (ALD-FBR),” Journal of the American Ceramic Society, vol. 87, pp. 762–765, Apr 2004.Google Scholar
[8] Barnes, W. L., Dereux, A., and Ebbesen, T. W., “Surface plasmon subwavelength optics,” Nature, vol. 424, pp. 824–830, Aug 2003.Google Scholar
[9] Alivisatos, P., “The use of nanocrystals in biological detection,” Nature Biotechnology, vol. 22, pp. 47–52, Jan 2004.Google Scholar
[10] Lee, K. J., Nallathamby, P. D., Browning, L. M., Osgood, C. J., and Xu, X. H. N., “In vivo imaging of transport and biocompatibility of single silver nanoparticles in early development of zebrafish embryos,” ACS Nano, vol. 1, pp. 133–143, Sep 2007.Google Scholar
[11] Wijnhoven, S. W. P., Peijnenburg, W. J. G. M., Herberts, C. A., Hagens, W. I., Oomen, A. G., Heugens, E. H. W., Roszek, B., Bisschops, J., Gosens, I., Van De Meent, D., Dekkers, S., De Jong, W. H., van Zijverden, M., Sips, A. n. J. A. M., and Geertsma, R. E., “Nano-silver - a review of available data and knowledge gaps in human and environmental risk assessment,” Nanotoxicology, vol. 3, pp. 109–138, 2009.Google Scholar
[12] Sotiriou, G. A., Sannomiya, T., Teleki, A., Krumeich, F., Vörös, J., and Pratsinis, S. E., “Non-toxic dry-coated nanosilver for plasmonic biosensors,” Advanced Functional Materials, vol. 20, pp. 4250–4257, 2010.Google Scholar
[13] Sotiriou, G. A., Teleki, A., Camenzind, A., Krumeich, F., Meyer, A., Panke, S., and Pratsinis, S. E., “Nanosilver on nanostructured silica: Antibacterial activity and Ag surface area,” Chemical Engineering Journal, vol. 170, pp. 547–554, 2011.Google Scholar
[14] Stober, W., Fink, A., and Bohn, E., “CONTROLLED GROWTH OF MONODISPERSE SILICA SPHERES IN MICRON SIZE RANGE,” Journal of Colloid and Interface Science, vol. 26, pp. 62-&, 1968.Google Scholar
[15] Han, Y., Jiang, J., Lee, S. S., and Ying, J. Y., “Reverse microemulsion-mediated synthesis of silica-coated gold and silver nanoparticles,” Langmuir, vol. 24, pp. 5842–5848, Jun 2008.Google Scholar
[16] Kobayashi, Y., Katakami, H., Mine, E., Nagao, D., Konno, M., and Liz-Marzan, L. M., “Silica coating of silver nanoparticles using a modified Stober method,” Journal of Colloid and Interface Science, vol. 283, pp. 392–396, Mar 2005.Google Scholar
[17] Xu, K., Wang, J. X., Kang, X. L., and Chen, J. F., “Fabrication of antibacterial monodispersed Ag-SiO2 core-shell nanoparticles with high concentration,” Materials Letters, vol. 63, pp. 31–33, Jan 2009.Google Scholar
[18] Mueller, R., Madler, L., and Pratsinis, S. E., “Nanoparticle synthesis at high production rates by flame spray pyrolysis,” Chemical Engineering Science, vol. 58, pp. 1969–1976, May 2003.Google Scholar
[19] Stark, W. J. and Pratsinis, S. E., “Aerosol flame reactors for manufacture of nanoparticles,” Powder Technology, vol. 126, pp. 103–108, 2002.Google Scholar
[20] Lide, D. R., CRC Handbook of Chemistry and Physics, 89 (Internet version)ed. Boca Raton, FL: CRC Press/Taylor and Francis, 2010.Google Scholar
[21] Teleki, A., Buesser, B., Heine, M. C., Krumeich, F., Akhtar, M. K., and Pratsinis, S. E., “Role of gas-aerosol mixing during in situ coating of flame-made titania particles,” Industrial & Engineering Chemistry Research, vol.48, pp. 85–92, Jan 2009.Google Scholar