کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10893 707 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of heat on nanocrystalline silver dressings: Part II: Physical properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Impact of heat on nanocrystalline silver dressings: Part II: Physical properties
چکیده انگلیسی

This work explores the effects of elevated temperature on the physical and chemical properties of nanocrystalline silver, and relates it to previously observed thermally induced changes in biological activity [Taylor PL et al. Biomaterials, in press, doi:10.1016/j.biomaterials.2005.05.040]. Microstructural evolution of nanocrystalline silver dressings, heat-treated for 24 h at temperatures from 23 to 110 °C, was studied in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). These analyses indicated that silver nanocrystalline coatings undergo significant changes in structure when exposed to elevated temperature. XRD analysis showed a rapid increase in crystallite size above 75 °C along with decomposition of crystalline silver oxide (Ag2O) at the onset of crystallite growth. SEM imaging showed a loss of fine features and sintering of the structure at elevated temperatures. The XPS data indicated that silver–oxygen bonds disappeared completely, with the initial decomposition occurring between 23 and 37 °C, and total oxygen in the coating decreased from 16–17% to 6.5% over the temperature range of 75–110 °C. A comparison of these results to the data of Taylor et al. [Biomaterials, in press, doi:10.1016/j.biomaterials.2005.05.040] indicates that the unique biological properties of nanocrystalline silver are related to its nanostructure. This should guide future development of therapeutic nanocrystalline silver delivery systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biomaterials - Volume 26, Issue 35, December 2005, Pages 7230–7240
نویسندگان
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