Journal: Powder Metallurgy & Mining PDF
Published: 18 Aug 15 Volume: 4 Issue: 1
DOI: 10.4172/2168-9806.1000128 ISSN: 2168-9806
Authors: Mahendra Kumar Trivedi, Rama Mohan Tallapragada, Alice Branton, Dahryn Trivedi, Gopal Nayak, Omprakash Latiyal, and Snehasis Jana *
Citation: Trivedi MK, Tallapragada RM, Branton A, Trivedi D, Nayak G, et al.(2015) Characterization of Physical, Thermal and Structural Properties of Chromium (VI) Oxide Powder: Impact of Biofield Treatment. J Powder Metall Min 4: 128. doi:10.4172/2168-9806.1000128
Chromium (VI) oxide (CrO3) has gained extensive attention due to its versatile physical and chemical properties. The objective of the present study was to evaluate the impact of biofield treatment on physical, thermal and structural properties of CrO3 powder. In this study, CrO3 powder was divided into two parts i.e. control and treatment. Control part was remained as untreated and treated part received Mr. Trivedi’s biofield treatment. Subsequently, control and treated CrO3 samples were characterized using Thermo gravimetric analysis-differential thermal analysis (TGA-DTA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). DTA showed that the melting point of treated CrO3 was increased upto 212.65°C (T3) as compared to 201.43°C in control. In addition, the latent heat of fusion was reduced upto 51.70% in treated CrO3 as compared to control. TGA showed the maximum thermal decomposition temperature (Tmax) around 330°C, was increased upto 340.12°C in treated CrO3 sample. XRD data revealed that lattice parameter and unit cell volume of treated CrO3 samples were reduced by 0.25 and 0.92% respectively, whereas density was increased by 0.93% in treated CrO3 sample as compared to control. The crystallite size of treated CrO3 was increased from 46.77 nm (control) to 60.13 nm after biofield treatment. FT-IR spectra showed the absorption peaks corresponding to Cr=O at 906 and 944 cm-1 in control, which were increased to 919 and 949 cm¬1 in treated CrO3 after biofield treatment. Overall, these results suggest that biofield treatment has substantially altered the physical, thermal and structural properties of CrO3 powder.
Biofield treatment; Chromium (VI) oxide powder; X-Ray diffraction; Fourier Transform Infrared Spectroscopy; TGA-DTA
Chromium oxides gain significant attention due to their diverse technological application in various industries. Chromium based oxides are used in various chemical reactions due to their wide range of oxidations states, it includes CrO2, Cr2O3, Cr2O5 and CrO3 etc . Out of these, chromium oxides, CrO3 is an important compound for automobile industries due to its high corrosion resistance properties. In these industries, CrO3 is used for plating the chromium on car body and other auto components. In addition, it is a strong oxidising agent, which enables it to be used in various pharmaceutical and chemical industries [2,3]. It is also reported that Cr (VI) complexes exhibit the antibacterial activity against Pseudomonas aeruginosa bacteria . In crystal structure of CrO3, its molecules form the chains of CrO4 tetrahedra, which are linked at corner oxygen . Furthermore, the crystal structure parameters such as lattice parameter, unit cell volume of CrO3 play a crucial role in modulating its chemical and physical properties. Thus, based on the above applications of CrO3 powder, authors planned to investigate an approach that could modify its physical, thermal and structural properties.
In physics, energy is a property of object which can be transferred to other objects, but it neither be created nor be destroyed. Albert Einstein proposed the relationship between mass and energy i.e. E=mc2 . This energy can be transferred through various processes such as thermal, chemical, kinetic, nuclear etc. Similarly, human nervous system consists of neurons, which have the ability to transmit information in the form of electrical signals [7-9]. Due to this, a human has ability to harness the energy from environment/universe and can transmit into any object (living or non-living) around the Globe. The object(s) always receive the energy and responded into useful way that is called biofield energy. This process is termed as biofield treatment. Mr. Trivedi’s unique biofield treatment (The Trivedi Effect®) is known to alter the physical, structural and atomic characteristic in various metals [10-12] and ceramics . Additionally, the impact of biofield treatment has been studied extensively in various fields such as microbiology [14,15], biotechnology [16,17], and agriculture [18-20]. Moreover, biofield treatment has significantly altered the particle size and crystallite size in zinc powder upto six and two folds, respectively . In addition, it has substantially altered the unit cell volume and molecular weight in vanadium pentoxide . Thus, based on the literature and excellent outcomes of biofield treatment, authors interested to investigate the effect of biofield treatment on physical, thermal and structural properties of CrO3 powder.
Materials and Methods
The CrO3 powder was purchased from Sigma Aldrich, India. The sample was equally divided into two parts, considered as control and treated. Treated group was in sealed pack and handed over to Mr. Trivedi for biofield treatment under laboratory condition. Mr. Trivedi provided the biofield treatment through his energy transmission process to the treated group without touching the sample. The control and treated samples were characterized using Thermo gravimetric analysis-differential thermal analysis (TGA-DTA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR).
Thermo Gravimetric Analysis-Differential Thermal Analysis (TGA-DTA)
Thermal analysis of control and treated CrO3 was analysed using Mettler Toledo simultaneous TGA and Differential thermal analyser (DTA). The samples were heated from room temperature to 400°C with a heating rate of 5°C/min under air atmosphere. From DTA, melting point and latent heat of fusion (ΔH) were computed using integral area under peaks. Thermal decomposition temperature (Tmax) was recorded from TGA curve. Percent change in melting point was calculated using following equation:
Where, T Control and T Treated are the melting point of control and treated samples, respectively.
Similarly, percent change in ΔH and Tmax were calculated.
X-ray Diffraction study (XRD)
XRD analysis of control and treated CrO3 powder was carried out on Phillips, Holland PW 1710 X-ray diffractometer system, which had a copper anode with nickel filter. The radiation of wavelength used by the XRD system was 1.54056Å. The data obtained from this XRD were in the form of a chart of 2θ vs. intensity and a detailed table containing peak intensity counts, d value (Å), peak width (θ°), relative intensity (%) etc. Additionally, PowderX software was used to calculate lattice parameter and unit cell volume of CrO3 powder samples. Weight of the unit cell was calculated as, molecular weight multiplied by the number of atoms present in a unit cell.
The crystallite size (G) was calculated by using formula:
Here, λ is the wavelength of radiation used, b is full width half maximum (FWHM) and k is the equipment constant (0.94). Furthermore, the percent change in the lattice parameter was calculated using following equation:
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, molecular weight, and crystallite size were calculated.
Fourier Transform Infrared Spectroscopy (FT-IR)
FT-IR spectroscopic analysis was carried out to evaluate the impact of biofield treatment at atomic and molecular level like bond strength, stability, and rigidity of structure etc. . FT-IR analysis of control and treated CrO3 samples was performed on Shimadzu, Fourier transform infrared (FT-IR) spectrometer with frequency range of 300-4000 cm-1 was used.
Results and Discussion
Thermo Gravimetric Analysis-Differential Thermal Analysis (TGA-DTA)
Thermal analysis of control and treated CrO3 samples was performed using TGA-DTA and results are presented in Table 1. DTA result showed that melting point of control sample was 201.43°C in control, however it was changed to 204.28°C, 204.24°C, 212.65°C and 200.88°C in treated CrO3 samples T1, T2, T3 and T4, respectively. It indicated that melting point was increased by 1.41, 1.40, and 5.57% in T1, T2, and T3, respectively, whereas a slight change (-0.27%) was observed in T4, as compared to control. Furthermore, data also showed that the simultaneous DTA (SDTA) integral area (denoted as negative value) at melting point was 235.53, 252.69, 235.13, 414.03, and 142.22 s °C in control, T1, T2, T3 and T4, respectively (Table 1). Further, SDTA integral values were used to compute the latent heat of fusion of control and treated CrO3 samples. The latent heat of fusion (ΔH) was 486.87J/g in control, whereas it was changed to 507.37, 274.04, 235.15, and 433.09 J/g in T1, T2, T3 and T4 respectively. Thus, data suggest that ΔH was increased by 4.21% in T1, however it was decreased by 43.71, 51.70, and 11.05% in T2, T3 and T4, respectively as compared to control. The melting point is fundamentally related with the kinetic energy and thermal vibration of the molecules, whereas latent heat of fusion is relates with the potential energy of molecules. Thus, the changes in melting point and ΔH after biofield treatment indicated that biofield treatment probably altered the kinetic and potential energy of the CrO3 molecules. It is assumed the bio field treatment might transfer the energy to treated sample, which probably altered the internal energy of the molecules. Besides, the thermal decomposition temperature (Tmax) was observed at 330°C in control and it was increased to 335, 336.98, 333.4, and 340.1°C in T1, T2, T3 and T4 respectively. It could be due to decomposition of CrO3 to Cr2O5 and Cr3O8. It is reported that in thermal decomposition process of CrO3, first converts to Cr2O5 followed by Cr3O8 . Further, data suggest that Tmax was increased by 1.52, 2.12, 1.02, and 3.07% in T1, T2, T3 and T4, respectively as compared to control. It could be due to increase in thermal stability of treated CrO3 samples after biofield treatment. In this process, samples lost around 13.28, 14.49, 82.57, 10.48, and 6.03% of its weight in control, T1, T2, T3, and T4, respectively. Recently, it was reported that biofield treatment has altered the percent weight loss in treated lead and tin powders . The percent of weight loss of CrO3 powder sample was higher in T1, T2, and T3 but lesser in T4, as compared to control. It could be due to change in intermolecular interaction and thermal stability in treated CrO3 after biofield treatment. Hence, TGA-DTA study revealed that biofield treatment has significantly altered the thermal properties of CrO3 powder.
X-ray Diffraction study (XRD)
XRD pattern of control and treated CrO3 samples are presented in Figure 1. The control sample peaks in XRD pattern were observed at 2θ=21.33°, 26.01°, 26.42°, 31.16°, 37.53°, 37.97°, and 40.03° which were
Table 1: TGA-DTA analysis of chromium (VI) oxide powder.
supported by literature data of CrO3 . However, XRD of treated CrO3 sample exhibited peaks at 2θ=21.39°, 26.13°, 26.51°, 31.32°, 37.63°, and 38.11°. The intense peaks in XRD pattern of control and treated CrO3 samples suggested its crystalline nature. Further, the crystal structure parameter such as lattice parameter, and unit cell volume were calculated using PowderX software and their percent change with respect to control are presented in Figure 2. Data showed that the lattice parameter and unit cell volume was reduced by 0.25 and 0.92%, respectively as compared to control. The change in unit cell volume can be considered as volumetric strain. Herein, negative volumetric strain found in treated CrO3 indicated that biofield treatment possibly induced compressive stress along the lattice parameter “a” that led to reduced unit cell volume in treated sample. Recently, alteration in unit cell volume and lattice parameter in zinc oxide, iron oxide and copper oxides using biofield treatment was reported by our group . In addition, the density of treated CrO3 was increased by 0.93% and molecular weight was reduced by 0.92% as compared to control. It could be possible if number of protons and neutron altered after biofield treatment. Thus, it is hypothesized that a weak reversible nuclear level reaction including neutrons-protons and neutrinos might occur in treated CrO3 powders after biofield treatment . Besides, the crystallite size was calculated using Scherrer formula is presented in Table 2. Data showed that crystallite size was 46.77 nm in control, whereas it was increased to 60.13 nm in treated sample. It suggested that crystallite size was increased by 28.57% as compared to control. Previously, our group reported that biofield treatment has increase the crystallite size in silicon dioxide , silicon carbide  and antimony
Table 2: Effect of biofield treatment on crystallite size chromium (VI) oxide powder.
. Furthermore, in order to increase the crystallite size, sufficient amount of energy is required to move the crystallite boundaries. Thus, it is hypothesised that the energy required for this process might be transferred through biofield treatment and that might be responsible for increase in crystallite size. Hence, XRD data revealed that biofield treatment has altered the physical and structural properties of CrO3 powder.
Fourier Transform Infrared Spectroscopy (FT-IR)
FT-IR spectrum of control and treated are shown in Figure 3. IR spectra exhibited the absorption peaks at 496, 736, 906, and 944 cm-1 in control, whereas these peaks were shifted to higher wavenumber i.e. 501, 741, 919, and 949 cm-1 in treated CrO3 spectra. The peaks at 906 and 944 cm-1 in control and 919 and 949 cm-1 in treated CrO3 can be attributed to chromyl (Cr=O) vibrations . The wavenumber observed in IR spectra is directly proportional to bond force constant. Thus it is assumed that the increase in wave number for Cr =O vibration could be due to increase in bond force constant after biofield treatment. In our previous study on iron oxide, biofield treatment had altered the bond strength of Fe-O bond . Thus, it is hypothesized that the energy transferred through biofield treatment probably enhanced the Cr=O bond strength in treated CrO3 molecules, which may lead to increase bond force constant, thus increase the wavenumber. In addition, the increase in Cr=O bond strength could increase the stability of CrO3 molecules. It is also supported by increase in thermal stability of treated CrO3 after biofield treatment.
The thermal analysis of CrO3 using TGA-DTA revealed that biofield treatment has altered the melting point, ΔH, and Tmax. The melting point was increased upto 5.57% in treated CrO3, whereas ΔH was reduced upto 51.70% in treated as compared to control. It is assumed that biofield treatment probably altered the internal energy of treated CrO3 samples, which may lead to alter the melting point and ΔH. In addition, Tmax was slightly increased up to 3.077% as compared to control. Besides, XRD data exhibited the alteration in lattice parameter, unit cell volume, density, and molecular weight in treated CrO3 as compared to control. The crystallite size of treated CrO3 sample was increased by 28.57% as compared to control. It may be due to movement of crystallite boundaries through biofield energy, which probably transferred via biofield treatment. FT-IR spectra revealed that the absorption peaks were shifted from 906 and 944 cm-1 (control) to higher wavenumber i.e. 919 and 949 cm-1 in treated CrO3 sample. It could be due to increase of bond force constant of Cr=O bond after biofield treatment. Overall, study results suggest that biofield treatment has significantly altered the thermal, physical and structural properties of CrO3 powder. It is also assumed that biofield treated CrO3 could be useful for chrome plating applications in automobile industries.
Authors gratefully acknowledged to Dr. Cheng Dong of NLSC, Institute of Physics, and Chinese academy of Sciences for providing the facilities to use PowderX software for analyzing XRD data. Authors also would like to thank Trivedi Science, Trivedi master wellness and Trivedi testimonials for their support during the work.
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