Microbial and electrical characterization of polyindole/hemoglobin composites
| dc.contributor.advisor | Mehtab, Sameena | |
| dc.contributor.author | Rawat, Shristi | |
| dc.date.accessioned | 2021-12-22T10:33:13Z | |
| dc.date.available | 2021-12-22T10:33:13Z | |
| dc.date.issued | 2021-10 | |
| dc.description.abstract | CPs and conjugate polymers composites have many important applications as supercapacitors, sensing materials, fuel cells, solar cells, batteries etc. In this direction, in present studies we developed WEs by the coating of PIN/Hb. Three types of PIN/Hb composites C-I, C-II and C-III with varying concentrations (100 mg, 200 mg and 300 mg) of Hb were mixed with selected and optimized binder (SPS) and filler (Gr). A homogenous slurry of all components were prepared in NMP solvent and manually spread over SS to develop coated WEs. The WEs obtained were further used for electrical characterization over Keithley four-probe DC conductivity meter. At variable voltage, I-V graph of PIN and its composites obtained were in linear relation that reflects Ohmic behaviour of composites. Conductivity data of examined WEs reveals that, at RT (25oC±1), all composites exhibits higher conductivity than PIN and it further increases with increase in concentration of Hb in composites at all examined voltages (1, 10 and 100 V). It was found that conductivities for all WEs were constant at 1 and 10 V and maximum at 100 V. Further C-III reflected highest value of conductivity 0.1 × 10-2 Scm-1 at 100 V. Conductivity examinations of WEs at variable temperature ranging from 25-125oC showed maximum conductivity (0.16 × 10-2 Scm-1) of C-III at 75oC. It was found that the conductivity of WEs increased up to 75oC and then it decreased and became constant after 100oC. WEs were baked at temperature range of 50-100oC in oven and their conductivities were measured over the time duration of 3-9 hr. The highest conductivities for all WEs were obtained at 50oC with baking over 3 hr, while C-III showed maximum conductivity (0.51 × 10-2 Scm-1) at similar baking condition. Baking examinations at 50oC over time, reflected that conductivities increases up to 3 hr, then there was a gradual decrease till 6 hr, after that it remained constant up to 9 hr for all WEs. Similar baking trends of conductivities were observed at 100oC for same time parameters. These changes in conductivity of WEs with temperature and baking over time, might be due to change in surface morphology, cracking and delamination of coating materials over SS at higher temperatures and extended time period. As per literature PIN was found to exhibit antifungal activities, but in our studies C-I, C-II and C-III, did not display any antifungal activities against three tested fungus Penicillium chrysogenum, Aspergillus niger, Trichoderma asperellum. Even it was observed that there is enhancement in the growth of fungus with C-I, C-II and C-III exposure that may be due to carbon source of PIN and Fe in Hb from composites that act as fungal growth promoters. Present investigation provides a simplified way of optimization and fabrication of WEs with enhanced electrical conductivities at variable temperature range and baking conditions and data reveals that C- III can be used in electrochemical energy storage devices. | en_US |
| dc.description.abstract | CPs and conjugate polymers composites have many important applications as supercapacitors, sensing materials, fuel cells, solar cells, batteries etc. In this direction, in present studies we developed WEs by the coating of PIN/Hb. Three types of PIN/Hb composites C-I, C-II and C-III with varying concentrations (100 mg, 200 mg and 300 mg) of Hb were mixed with selected and optimized binder (SPS) and filler (Gr). A homogenous slurry of all components were prepared in NMP solvent and manually spread over SS to develop coated WEs. The WEs obtained were further used for electrical characterization over Keithley four-probe DC conductivity meter. At variable voltage, I-V graph of PIN and its composites obtained were in linear relation that reflects Ohmic behaviour of composites. Conductivity data of examined WEs reveals that, at RT (25oC±1), all composites exhibits higher conductivity than PIN and it further increases with increase in concentration of Hb in composites at all examined voltages (1, 10 and 100 V). It was found that conductivities for all WEs were constant at 1 and 10 V and maximum at 100 V. Further C-III reflected highest value of conductivity 0.1 × 10-2 Scm-1 at 100 V. Conductivity examinations of WEs at variable temperature ranging from 25-125oC showed maximum conductivity (0.16 × 10-2 Scm-1) of C-III at 75oC. It was found that the conductivity of WEs increased up to 75oC and then it decreased and became constant after 100oC. WEs were baked at temperature range of 50-100oC in oven and their conductivities were measured over the time duration of 3-9 hr. The highest conductivities for all WEs were obtained at 50oC with baking over 3 hr, while C-III showed maximum conductivity (0.51 × 10-2 Scm-1) at similar baking condition. Baking examinations at 50oC over time, reflected that conductivities increases up to 3 hr, then there was a gradual decrease till 6 hr, after that it remained constant up to 9 hr for all WEs. Similar baking trends of conductivities were observed at 100oC for same time parameters. These changes in conductivity of WEs with temperature and baking over time, might be due to change in surface morphology, cracking and delamination of coating materials over SS at higher temperatures and extended time period. As per literature PIN was found to exhibit antifungal activities, but in our studies C-I, C-II and C-III, did not display any antifungal activities against three tested fungus Penicillium chrysogenum, Aspergillus niger, Trichoderma asperellum. Even it was observed that there is enhancement in the growth of fungus with C-I, C-II and C-III exposure that may be due to carbon source of PIN and Fe in Hb from composites that act as fungal growth promoters. Present investigation provides a simplified way of optimization and fabrication of WEs with enhanced electrical conductivities at variable temperature range and baking conditions and data reveals that C- III can be used in electrochemical energy storage devices. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810179723 | |
| dc.keywords | characterization, polyindole, hemoglobin, composites | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 117 | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.research.problem | Composites | en_US |
| dc.research.problem | Composites | en_US |
| dc.sub | Chemistry | en_US |
| dc.sub | Chemistry | en_US |
| dc.theme | Polymers | en_US |
| dc.theme | Polymers | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Microbial and electrical characterization of polyindole/hemoglobin composites | en_US |
| dc.type | Thesis | en_US |