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Physicochemical and Atomic Characterization of Silver Powder after Biofield Treatment

Journal:

Bioengineering & Biomedical Science
Received: July 24, 2015; Accepted: September 16, 2015; Published: September 28, 2015

Citation:

Trivedi MK, Tallapragada RM, Branton A, Trivedi D, Nayak G, et al. (2015) Physicochemical and Atomic Characterization of Silver Powder after Biofield Treatment. J Bioengineer & Biomedical Sci 5: 165. doi:10.4172/2155- 9538.1000165

Title:

Physicochemical and Atomic Characterization of Silver Powder after Biofield Treatment

Manuscript Link:

http://www.omicsonline.org/open-access/physicochemical-and-atomic-characterization-of-silver-powder-afterbiofield-treatment-2155-9538-1000165.pdf

 

Abstract

Silver is widely utilized as antimicrobial agent and wound dressing, where its shape, size, surface area, and surface charge play an important role. The aim of present study was to evaluate the impact of biofield treatment on physicochemical and atomic properties of silver powder. The silver powder was divided into two groups, coded as control and treatment. The treatment group received Mr. Trivedi’s biofield treatment. Subsequently, control and treated samples were characterized using particle size analyzer, X-ray diffraction (XRD) and surface area analyser. Particle size data exhibited that particle sizes d10, d50, d90, and d99 (Size, below which 10, 50, 90, and 99% particle are present, respectively) of treated silver powder were substantially reduced up to 95.8, 89.9, 83.2, and 79.0% on day 84 as compared to control. XRD results showed that lattice parameter, unit cell volume, and atomic weight were reduced, whereas density and nuclear charge per unit volume were found to be increased as compared to control. In addition, the crystallite size was significantly reduced up to 70% after biofield treatment on day 105 as compared to control. Furthermore, the surface area of treated silver powder was substantially enhanced by 49.41% on day 68 as compared to control. These findings suggest that biofield treatment has significantly altered the atomic and physicochemical properties which could make silver more useful in antimicrobial applications.

Keywords: Biofield treatment; Silver; X-ray Diffraction; Particle size; Surface area

Introduction

Silver (Ag), a white, lustrous transition metal, known for its high electrical conductivity, reflectivity, and thermal conductivity. It exists in form of face centred cubic (FCC) crystal structure. Silver is widely used for electrical applications, filler material in conductive polymer, solar photovoltaic panel etc. [1]. Besides this, silver and silver-based compounds have been used in several antimicrobial applications [2]. Guggenbichler et al. reported that silver has most effective antibacterial action and least toxicity to animal cell [3]. Silver ions (Ag+) are microcidal at low concentration, which can be used to treat burns, wounds and ulcers. In addition, silver is also used in various hygiene products including face creams, health supplements, and water filtration cartridges [4]. Silver nanoparticles are gaining tremendous attention due to its capability of modulating the chemical, physical, antimicrobial, and optical properties. Furthermore, it is well established that uniform sized particles, with required shape, physical and chemical properties are of great interest in the formulation of new pharmaceutical products [5]. Besides, silver nanoparticles can be synthesised through various techniques such as sol gel, reverse micelle, intern gas condensation, and sonochemistry, etc, but many of these techniques either use hazardous or expensive chemicals [6]. Moreover, in physical condensation process a tube furnace is used, which occupies a large space and require large amount of thermal power [7]. Whereas, in chemical synthesis approach, the use of strong reducing agent such as borohydride results into smaller particles but it is difficult to control over large particle [8]. Thus, after considering properties and biological applications of silver, authors wanted to investigate an economically safe approach that could be beneficial to modify the physical and structural properties of silver powder.

The law of mass-energy inter-conversion has existed in the literature for more than 300 years for which first idea was given by Hasenohrl, after that Einstein derived the well-known equation E=mc2 for light and mass [9,10]. Furthermore, the energy exists in various forms and there are several ways to transfer the energy from one place to another such as electromagnetic waves, electrochemical, electrical and thermal etc. Similarly, the human nervous system consists of neurons, which have the ability to transmit information and energy in the form of electrical signals [11]. Thus, a human has ability to harness the energy from environment/universe and it can transmit into any object (living or non-living) on the Globe. The object always receives the energy and responded into useful way and that is called biofield energy. This process is known as biofield treatment. Mr. Trivedi’s biofield treatment has known to transform the characteristics in various fields such as material science [12,13], microbiology [14-16], biotechnology [17,18], and agriculture [19-21]. In metals and ceramics the biofield treatment has shown the excellent results at physical, thermal, and atomic level [22,23]. In addition to this, the biofield treatment had increased the crystallite size and particle size by two folds and six folds, respectively in carbon allotropes [24]. Based on the outstanding results achieved by biofield treatment on metals and ceramics, an attempt was made to evaluate the effect of biofield treatment on atomic and physicochemical properties of silver powder.

Experimental

Silver powder used in present investigation was procured from MEPCO, India. Silver powder was divided into two parts, referred as control and treated. The treated part was received Mr. Trivedi’s biofield treatment. Control and treated samples were characterized using particle size analyzer, X-ray diffraction (XRD), and surface area analyzer at different time periods.

Particle size analysis

Particle size analyzer, Sympatec HELOS-BF was used to determine the particle size distribution. This system can detect the particle of size from 0.1 μm to 875 μm. The data obtained from the instrument was in the form of a chart of cumulative percentage vs. particle size. Particle sizes d10, d50, d90, and d99 (size below which 10, 50, 90, and 99% particle are present, respectively) were computed from particle size distribution curve. Percent change in particle size was calculated using following equations:

for-1

Where, (d10) Control and (d10) Treated are the particle size, d10 of control and treated samples respectively. Similarly, the percent change in particle size d50, d90, and d99 were calculated.

X-ray diffraction analysis

XRD analysis of control and biofield treated silver powder was carried out on Phillips, Holland PW 1710 XRD diffractometer, which had a copper anode with nickel filter. The wavelength of X-ray radiation used was 1.54056 Å. Data obtained from the XRD was in chart form of intensity vs. 2θ°, with a detailed table containing d value (Å), number of peaks, peak width 2θ°, peak count, relative intensity of peaks, etc. Further, lattice parameter, unit cell volume, and atomic weight were computed using PowderX software. Atomic weight in g/ mol was calculated as multiplying the atomic weight by the Avogadro number (6.023 × 1023). Weight of the unit cell was calculated as, atomic weight multiplied by the number of atoms present in a unit cell. Total nuclear charge was calculated as the number of protons multiplied by charge on a proton (1.6 × 10-19C). Nuclear charge per unit volume was computed as follow:

for-2

Crystallite size was calculated as follow:

Crystallite size = k λ/ b Cosθ.

Where, λ is the wavelength of x-ray (=1⋅54056 Å) and k is the equipment constant (=0.94).

Besides, the percent change in the lattice parameter was calculated using following equation:

for-3

Where A Control and A Treated are the lattice parameter of treated and control samples respectively. Similarly, the percent change in all other parameters such as unit cell volume, density, atomic weight, nuclear charge per unit volume, crystallite size were calculated.

Surface area analysis

The surface area was measured by the Surface area analyser, SMART SORB 90 based on Brunauer–Emmett–Teller (BET), which had a detection range of 0⋅2-1000 m2/g. Percent change in surface area was calculated using following equations:

for-4

Where, S Control and S Treated are the surface area of control and treated samples respectively.

Results and Discussion

Particle size analysis

The particle size analysis results of d10, d50, d90, and d99 of silver powder are presented in Table 1. Data showed that the particle size, d10 i.e. smaller size particles of treated silver sample was increased from 47.04 μm (control) to 48.73 μm on day 10, whereas it was significantly reduced to 1.97, 1.68, and 1,67 μm on day 84, 91, and 109, respectively. It suggest that d10, was substantially decreased by 95.81, 96.43, and 96.45% on day 84, 91, and 109 respectively as compared to control. Average particle size, d50 was significantly reduced from 81.90 μm (control) to 79.43, 8.31, 6.82, and 6.94 μm on day 10, 84, 91, and 109 respectively in treated silver sample. It suggest that d50 of treated silver sample was substantially reduced by 3.02, 89.85, 91.67, and 91.53% on day 10, 84, 91, and 109, respectively as compared to control. In addition, particle size, d90 of treated silver sample was reduced from 124.29 μm (control) to 118.71, 20.88, 17.60, and 34.59 μm on day 10, 84, 91, and 109 respectively, which indicated that after biofield treatment, d90 of silver samples were reduced by 4.49, 83.20, 85.84, and 72.17% on day 10, 84, 91, and 109, respectively as compared to control. Furthermore, the particle size d99 was significantly reduced from 173.70 μm (control) to 154.16, 36.55, 34.95, and 61.35 μm on day 10, 84, 91, and 109 respectively in treated silver sample. It indicated that d99 of treated silver sample was substantially reduced by 11.25, 78.96, 79.88, and 64.88% on day 10, 84, 91, and 109 respectively as compared to control. Overall, particle size data revealed that biofield treatment has significantly reduced the silver particle size. Our group previously reported that biofield treatment has significantly reduced the particle size in titanium and antimony powder [12,13]. Silver particles have high density of point defects, dislocations, grain and interphase boundaries. The boundaries are structurally weak points in silver powder, which can easily fracture under high stress conditions. Thus, it is assumed that biofield treatment probably transfer the stress energy to silver particles, which may results into fracturing of particles and reduced particle size. It is reported that antimicrobial action of silver is depend upon its size i.e smaller the size of silver particles, higher is antimicrobial efficacy in human body [25,26]. Further, it is also reported that antimicrobial activity of silver is associated with its ionized form as body fluid ionized the silver (Ag+) and make it highly reactive. This ionized silver atom binds to tissue protein and change the structure of bacterial cell wall and nuclear membrane, which further leads to cell distortion and death d10, d50, d90, and d99 are the size below which 10%, 50%, 90%, and 99% particles are present, respectively. [27]. Further, in order to study the effect of biofield treatment at atomic level, XRD analysis was carried out (Figure 1).

fig-1
Figure 1: Effect of biofield treatment on particle size of silver powder.

Group

d10 (μm)

d50 (μm)

d90 (μm)

d99 (μm)

Control, day 0

47.04

81.90

124.29

173.70

Treated, day 10

48.73

79.43

118.71

154.16

Treated, day 84

1.97

8.31

20.88

36.55

Treated, day 91

1.68

6.82

17.60

34.95

Treated, day 109

1.67

6.94

34.59

61.35

Table 1. Effect of biofield energy treatment on crystallite size of silver oxide powder.

X-ray diffraction analysis

XRD analysis results of control and treated silver samples are illustrated in Tables 2 and 3. Data showed that the lattice parameter of FCC unit cell of treated silver sample was reduced by 0.16 and 0.25% on day 105 and 203 respectively, whereas no significant change was observed on day 105 and 189 as compared to control. Furthermore, the unit cell volume was decreased by 0.47 and 0.75 on day 105 and 203 respectively as compared to control. Reduction of unit cell volume leads to increase the density by 0.47 and 0.75 % on day 105 and 203, respectively as compared to control. Thus, the decrease in unit cell volume and increase in density in treated silver sample indicates that compressive stress may be applied through biofield treatment [28]. Hence, it is assumed that an energy milling might be induced through biofield treatment, which probably provided the high stress and that might be responsible for internal strains in treated silver. Besides, data also showed that atomic weight of treated silver sample was decreased by 0.47 and 0.75% and nuclear charge per unit volume was increased by 0.47 and 0.75% on day 105 and 203, respectively as compared to control. No significant change was observed in lattice parameter, unit cell volume, density, atomic, weight and nuclear charge per unit volume in treated silver sample on day 105 and 189. It is hypothesized that the compressive stress induced through energy milling over unit cell may lead to move the electron cloud toward nucleus from their original position, which may reduce atomic size (volume of the atom) [24]. The reduction of atomic size may increase nuclear charge per unit volume in treated silver since both are inversely related. Previously, our group reported that biofield treatment had increased the nuclear charge per unit volume in zinc and chromium [12]. Moreover, the increase in nuclear charge per unit volume in silver as compared to control indicates that ionic strength of silver (Ag+) probably enhanced after biofield treatment. It is reported that positive charge of silver ions (Ag+) plays an important role in antimicrobial activity [29]. Thus, it is assumed that biofield treated silver could exhibit the higher antimicrobial efficacy as compared to control. Besides, the crystallite size of treated silver sample was reduced from 72.89 nm (control) to 21.87, 31.26, 62.48 and 27.35 nm on day 105, 156, 189, 203 respectively. Thus, data suggest that crystallite size in treated silver sample was significantly reduced by 70.0, 57.1, 14.3, and 62.5% on day 105, 156, 189, 203, respectively as compared to control. The existence of internal strain in treated silver is evidenced by change in unit cell volume and lattice parameter (Table 3). These internal strains made dislocations to move on the slip planes and intersecting slip planes built in stress concentrations. Furthermore, the stress concentration increases to such an extent causing the crystal to fracture at the sub boundaries and reduce the crystallite size. Our group previously reported that biofield treatment has significantly reduced the crystallite size in aluminium [30]. Furthermore, it is demonstrated that the rate of dissolution of a drug can be improved by choosing solids which exhibits high solubility due to low crystallinity or high amorphous phase [31]. Torrado et al. reported that solids with smaller crystallite size exhibited faster dissolution rate as compared to solids with higher crystallite size [32]. Thus, it is assumed that biofield treated silver powder may exhibit the higher dissolution rate in body fluid as compared to control, which ultimately can improve the bioavailability of dosage form containing silver.

Group

Lattice Parameter (Å)

Unit Cell Volume

(×10-23 cm3)

Density

(g/cc)

Atomic Weight

(g/mol)

Nuclear charge per unit volume

(C/cm3)

Crystallite

Size (nm)

Control, day 0

4.098

6.882

10.511

108.932

208619.88

72.89

Treated, day 105

4.099

6.887

10.504

109.008

208473.34

21.87

Treated, day 156

4.092

6.850

10.561

108.418

209609.57

31.26

Treated, day 189

4.098

6.885

10.508

108.966

208555.75

62.48

Treated, day 203

4.088

6.831

10.591

108.117

210190.04

27.35

Table 2: Effect of biofield treatment on atomic and structural parameters of silver powder.

Group

Percent Change

Lattice Parameter

Unit Cell Volume

 

Density

 

Atomic Weight

 

Nuclear Charge Per Unit Volume

 

Crystallite

Size

Treated, day 105

0.02

0.07

-0.07

0.07

-0.07

-70.0

Treated, day 156

-0.16

-0.47

0.47

-0.47

0.47

-57.1

Treated, day 189

0.01

0.03

-0.03

0.03

-0.03

-14.3

Treated, day 203

-0.25

-0.75

0.75

-0.75

0.75

-62.5

Table 3: Effect of biofield treatment on percent change in atomic and structural parameters of silver powder as compared to control.

Surface area analysis

Surface area of control and treated silver samples are presented in Table 4. Data exhibited that surface area of treated silver sample was increased from 1.70 m2/g (Control) to 2.54 m2/g on day 68 as compared to control. It indicates that surface area was enhanced by 49.41% as compared to control on day 68 after biofield treatment. It is well established that decrease in particle size of any powder enhance its surface area. Thus, the decrease in particle size leads to increase the surface area of treated silver powder after biofield treatment. Our group previously reported that biofield 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 [35]:

for-5

Group

Control, day 0

Treated, day 68

Percent change

Surface area

1.70 m2/g

2.54 m2/g

49.41

Figure 1: Effect of biofield treatment on particle size of silver powder.

Where, D is diffusion constant, Cs and C are the concentration in the bulk dissolution medium and diffusion layer surrounding the solid, respectively, L is diffusion layer thickness. This equation revealed that the rate of dissolution can be modified primarily by altering the surface area of the solids. Thus, the large surface area of treated silver as compared to control indicates a higher dissolution rate of silver particles in surrounding fluid, 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]. Thus, overall study suggest that bioavailability and antimicrobial efficacy of biofield treated silver might enhanced after biofield treatment.

Conclusion

Overall, biofield treatment has substantially altered the atomic and physicochemical properties of silver powder. Particle size data revealed that d10, d50, d90, and d99 of treated silver powder were significantly 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. Thus, reduction in particle size, crystallite size and increase in surface area may increase the dissolution rate and thus bioavailability, which further attributes to antimicrobial efficacy of treated silver as compare to control.

Acknowledgement

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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