Citation: Trivedi MK, Tallapragada RM, Branton A, Trivedi D, Nayak G, et al. (2015) Physicochemical and Atomic Characterization of Silver Powder
after Bioeld Treatment. J Bioengineer & Biomedical Sci 5: 165. doi:10.4172/2155- 9538.1000165
Page 4 of 5
Volume 5 • Issue 3 • 1000165
J Bioengineer & Biomedical Sci
ISSN:2155-9538 JBBS an open access journal
previously reported that bioeld treatment has reduced the surface area
in silicon and zirconium oxide [33,34]. Noyes-Whitney proposed the
relationship between rate of dissolution (R) and surface area (S) of a
solid as following :
DS C C
Where, D is diusion constant, Cs and C are the concentration
in the bulk dissolution medium and diusion layer surrounding the
solid, respectively, L is diusion layer thickness. is equation revealed
that the rate of dissolution can be modied primarily by altering
the surface area of the solids. us, the large surface area of treated
silver as compared to control indicates a higher dissolution rate of
silver particles in surrounding uid, which possibly improves the
bioavailability. Moreover, it is reported that antimicrobial activity of
silver is highly depended on its surface area since higher surface area
causes large exposure to bacteria [36,37]. us, overall study suggest
that bioavailability and antimicrobial ecacy of bioeld treated silver
might enhanced aer bioeld treatment.
Overall, bioeld treatment has substantially altered the atomic and
physicochemical properties of silver powder. Particle size data revealed
, and d
of treated silver powder were signicantly
reduced up to 95.8, 89.9, 83.2, and 79.0% on day 84 as compared to
control. XRD results showed that unit cell volume and atomic weight
was decreased up to 0.75%, whereas density and nuclear charge per
unit volume and density decreased up to 0.75% as compared to control
silver on day 203. Also, the increase in nuclear charge per unit volume
indicates that ionic strength of silver (Ag
) probably enhanced, which
may improve its antimicrobial activity. In addition, crystalline size was
reduced up to 70% in treated silver as compared to control on day 105.
Moreover, the decrease in particle size, increases the surface area up
to 49.41 % in treated silver powder as compared to control on day 68.
us, reduction in particle size, crystallite size and increase in surface
area may increase the dissolution rate and thus bioavailability, which
further attributes to antimicrobial ecacy of treated silver as compare
Authors gratefully acknowledge to Dr. Cheng Dong of NLSC, Institute of
Physics and Chinese academy of sciences for providing the facilities to use Powder
X software for analyzing XRD results.
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Group Control, day 0 Treated, day 68 Percent change
Surface area 1.70 m
/g 2.54 m
Table 4: Effect of bioeld treatment on surface area of silver powder.