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Questions and Answers
What method is used to synthesize cobalt nanoparticles in this study?
What method is used to synthesize cobalt nanoparticles in this study?
Which of the following techniques was NOT used for the characterization of the synthesized nanoparticles?
Which of the following techniques was NOT used for the characterization of the synthesized nanoparticles?
What was the concentration of cobalt chloride used for synthesizing cobalt nanoparticles?
What was the concentration of cobalt chloride used for synthesizing cobalt nanoparticles?
How long was the mixture boiled during the preparation of the mango leaf extract?
How long was the mixture boiled during the preparation of the mango leaf extract?
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What is the purpose of using DPPH in the antioxidant activity assay?
What is the purpose of using DPPH in the antioxidant activity assay?
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What was the initial temperature when the mango leaves were boiled to prepare the extract?
What was the initial temperature when the mango leaves were boiled to prepare the extract?
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After synthesis, where was the synthesized cobalt nanoparticle extract stored for further use?
After synthesis, where was the synthesized cobalt nanoparticle extract stored for further use?
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What is the main purpose of grinding mango leaves in this method?
What is the main purpose of grinding mango leaves in this method?
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What is a method mentioned for synthesizing nickel nanoparticles?
What is a method mentioned for synthesizing nickel nanoparticles?
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Which of the following materials is utilized alongside Aloe vera extract for nanoparticle synthesis?
Which of the following materials is utilized alongside Aloe vera extract for nanoparticle synthesis?
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Which method is used to study the optical properties of nanoparticles according to the content?
Which method is used to study the optical properties of nanoparticles according to the content?
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What type of nanoparticles were synthesized using psidium guajava leaves extracts?
What type of nanoparticles were synthesized using psidium guajava leaves extracts?
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Which journal published a study on the synthesis of nickel nanoparticles in surfactant solutions?
Which journal published a study on the synthesis of nickel nanoparticles in surfactant solutions?
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Which application of nanoparticles was highlighted in the context of benign routes for synthesis?
Which application of nanoparticles was highlighted in the context of benign routes for synthesis?
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What was the primary focus of the article by Gupta et al. (2013)?
What was the primary focus of the article by Gupta et al. (2013)?
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In which context were cobalt oxide nanoparticles addressed in the content?
In which context were cobalt oxide nanoparticles addressed in the content?
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What is the average crystal size of the cobalt nanoparticles synthesized from mango leave extract?
What is the average crystal size of the cobalt nanoparticles synthesized from mango leave extract?
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Which equation is used to calculate the average crystal size?
Which equation is used to calculate the average crystal size?
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Which plane corresponds to the 2θ value of 22.12 in the XRD pattern of the cobalt nanoparticles?
Which plane corresponds to the 2θ value of 22.12 in the XRD pattern of the cobalt nanoparticles?
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What concentration range was used for evaluating the antibacterial activity of the cobalt nanoparticles?
What concentration range was used for evaluating the antibacterial activity of the cobalt nanoparticles?
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Which bacteria demonstrated the largest zone of inhibition when tested against the biosynthesized cobalt nanoparticles?
Which bacteria demonstrated the largest zone of inhibition when tested against the biosynthesized cobalt nanoparticles?
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What relationship does the Scherer equation describe?
What relationship does the Scherer equation describe?
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According to the study, which bacterium is the most susceptible to cobalt nanoparticles?
According to the study, which bacterium is the most susceptible to cobalt nanoparticles?
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What effect does increasing the concentration of cobalt nanoparticles have on % DPPH radical scavenging activity?
What effect does increasing the concentration of cobalt nanoparticles have on % DPPH radical scavenging activity?
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Which elements were found in significant concentrations in the synthesized cobalt nanoparticles?
Which elements were found in significant concentrations in the synthesized cobalt nanoparticles?
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What does the presence of chlorine and oxygen in cobalt nanoparticles suggest?
What does the presence of chlorine and oxygen in cobalt nanoparticles suggest?
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What could be a reason for the impurities found in the synthesized cobalt nanoparticles?
What could be a reason for the impurities found in the synthesized cobalt nanoparticles?
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Which of the following elements could act as dopants or contaminants in the cobalt nanoparticles?
Which of the following elements could act as dopants or contaminants in the cobalt nanoparticles?
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What effect do impurities have on the cobalt nanoparticles?
What effect do impurities have on the cobalt nanoparticles?
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What method was used to synthesize the cobalt nanoparticles mentioned in the findings?
What method was used to synthesize the cobalt nanoparticles mentioned in the findings?
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How might exposure to air or water affect cobalt nanoparticles?
How might exposure to air or water affect cobalt nanoparticles?
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Which characteristic is directly influenced by the impurities in cobalt nanoparticles?
Which characteristic is directly influenced by the impurities in cobalt nanoparticles?
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What technique is primarily used for synthesizing undoped and cobalt-doped TiO2 nanoparticles?
What technique is primarily used for synthesizing undoped and cobalt-doped TiO2 nanoparticles?
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In which study is the biological synthesis of cobalt nanoparticles discussed?
In which study is the biological synthesis of cobalt nanoparticles discussed?
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Which of the following applications is NOT mentioned for cobalt nanoparticles?
Which of the following applications is NOT mentioned for cobalt nanoparticles?
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Which plant extract is used for the ecofriendly synthesis of cobalt nanoparticles as per the relevant studies?
Which plant extract is used for the ecofriendly synthesis of cobalt nanoparticles as per the relevant studies?
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What is one described advantage of using cobalt nanoparticles in the mentioned research studies?
What is one described advantage of using cobalt nanoparticles in the mentioned research studies?
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Which journal published the study on the antimicrobial and photocatalytic activity of cobalt oxide nanoparticles?
Which journal published the study on the antimicrobial and photocatalytic activity of cobalt oxide nanoparticles?
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What is the outcome of using Celosia argentea extract for synthesizing cobalt nanoparticles?
What is the outcome of using Celosia argentea extract for synthesizing cobalt nanoparticles?
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Which temperature condition is associated with the biosynthesis of silver nanoparticles, as per the studies mentioned?
Which temperature condition is associated with the biosynthesis of silver nanoparticles, as per the studies mentioned?
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Study Notes
Nanoparticles and Their Importance
- Nanoparticles exhibit unique properties that differ from bulk materials, crucial in applications like optics, electronics, catalysis, and magnetism.
- Their significance extends to thermal properties, enhancing material performance.
Sample Collection and Preparation
- Mango leaves were collected in Kaduna metropolis.
- Samples underwent thorough washing with tap and then distilled water to eliminate contaminants.
- Dried leaves were ground into a fine powder for extraction.
- A 20g portion was combined with 100ml distilled water and boiled at 80°C for 35 minutes, followed by cooling and filtration to obtain a leaf extract.
Synthesis of Cobalt Nanoparticles (Co-NPs)
- Cobalt nanoparticles were synthesized using a bio-reduction method with slight modifications.
- A mixture of 10ml mango leaf extract and 100ml of 0.5M cobalt chloride solution was stirred and left to settle for monitoring bio-reduction of Co^2+ ions over 0 to 24 hours.
Characterization Techniques
- Characterization employed methods like UV-visible spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD).
- Analysis revealed elemental composition: Cobalt (14.55%), Oxygen (57.09%), and Chlorine (25.93%).
Antioxidant Activity Determination
- Antioxidant potential was evaluated using the DPPH scavenging assay with varying concentrations of Co-NPs.
- Results indicated significant antioxidant activity correlating with increasing nanoparticle concentrations.
Antibacterial Properties
- Cobalt nanoparticles demonstrated antibacterial effectiveness against Salmonella typhi, Staphylococcus aureus, and Escherichia coli.
- Zones of inhibition measured 40mm for Salmonella typhi and E. coli, and 34mm for Staphylococcus aureus.
- Comparison with ciproflaxin indicated superior antibacterial activity of Co-NPs.
Impurities and Their Effects
- Presence of impurities, including other elements from the leaf extract, potentially affects nanoparticles' properties such as size, shape, and biocompatibility.
- Oxidation or hydrolysis may occur with exposure to air or water, impacting crystallinity and magnetic behavior.
XRD Findings
- XRD analyses showed distinct diffraction peaks corresponding to the cubic lattice structure of cobalt nanoparticles.
- The calculated average crystal size was 53.87 nm, using the Scherer equation that links peak width and crystallite size.
Conclusion
- Cobalt nanoparticles from mango leaves have promising applications in therapeutic and biomedical fields due to their antioxidant and antibacterial properties.
- Further studies could refine the synthesis process and improve purity for enhanced efficacy in applications.
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Description
This quiz explores the significance of nanoparticles and their properties, as well as the methodology for collecting and preparing mango leaves for research. It focuses on the interdisciplinary applications of these materials in various fields including optics and electronics. Test your knowledge on the research practices and applications related to nanoparticles.
