Validity of Several Thermal Conductivity Models in Metal Oxide Nanoparticles Filled Polycarbonate

2013 ◽  
Vol 739 ◽  
pp. 51-56 ◽  
Author(s):  
Mohammad Akbarzadeh ◽  
Hassan Ebadi-Dehaghani ◽  
Meisam Sadeghi
Keyword(s):  
Thermal Conductivity ◽  
Iron Oxide ◽  
Metal Oxide ◽  
Magnesium Oxide ◽  
Cupric Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Mgo Nanoparticles ◽  
Nanoparticles Concentration ◽  
Conductivity Models

The thermal conductivity (TC) of compression moulded polycarbonate (PC) and PC filled with 2.5-5% iron oxide (α-Fe2O3), cupric oxide (CuO) or magnesium oxide (MgO) nanoparticles, prepared by extrusion, was studied using a thermal conductivity analyser (TCA). The effect of type and content of nanoparticles on the thermal conductivity was investigated. The experimental TC values of the PC nanocomposites showed an increase with an increase in the level of nanoparticles concentration. The TC improvement in PC/CuO nanocomposite was greater than that of other nanocomposites. Several models were used for prediction of the TC in the nanocomposites. In all nanocomposites the TC values correlated well with the values predicted by the Ce Wen Nan model up to 5wt%.

Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes

2008 ◽  
Vol 92 (2) ◽  
pp. 023110 ◽  
Author(s):  
Jesse Wensel ◽  
Brian Wright ◽  
Dustin Thomas ◽  
Wayne Douglas ◽  
Bert Mannhalter ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Enhanced Thermal Conductivity

Influence of metal oxide nanoparticles concentration on their zeta potential

2013 ◽  
Vol 407 ◽  
pp. 22-28 ◽  
Author(s):  
Nan Wang ◽  
Chien Hsu ◽  
Lihua Zhu ◽  
Shiojenn Tseng ◽  
Jyh-Ping Hsu
Keyword(s):  
Zeta Potential ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Nanoparticles Concentration

Prediction of Thermal Conductivity of Nanofluids Containing Metal Oxide Nanoparticles

2015 ◽  
Vol 7 (5) ◽  
pp. 378-384 ◽  
Author(s):  
Kamalesh Verma ◽  
Sajjan Kumar ◽  
Anupama Upadhyay ◽  
Ramvir Singh
Keyword(s):  
Thermal Conductivity ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles

scholarly journals The Bio-Synthesis of Three Metal Oxide Nanoparticles (ZnO, MnO2, and MgO) and Their Antibacterial Activity Against the Bacterial Leaf Blight Pathogen

2020 ◽  
Vol 11 ◽  
Author(s):  
Solabomi Olaitan Ogunyemi ◽  
Muchen Zhang ◽  
Yasmine Abdallah ◽  
Temoor Ahmed ◽  
Wen Qiu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Growth Parameter ◽  
Significant Inhibition ◽  
Leaf Blight ◽  
Bacterial Leaf Blight ◽  
Oxide Nanoparticles ◽  
Tem Analysis ◽  
Mgo Nanoparticles ◽  
Vis Spectroscopy

Xanthomonas oryzae pv. oryzae (Xoo) is the most infectious pathogen of rice, which causes bacterial leaf blight (BLB) disease. However, the accumulation of chemical or antibiotic resistance of Xoo necessitate the development of its alternative control. In this study, we biologically synthesize three metal oxide nanoparticles (ZnO, MnO2, and MgO) using rhizophytic bacteria Paenibacillus polymyxa strain Sx3 as reducing agent. The biosynthesis of nanoparticles was confirmed and characterized by using UV-vis spectroscopy, XRD, FTIR, EDS, SEM, and TEM analysis. The UV Vis reflectance of the nanoparticle had peaks at 385, 230, and 230 nm with an average crystallite particle size 62.8, 18.8, and 10.9 nm for ZnO, MnO2, and MgO, respectively. Biogenic ZnO, MnO2, and MgO nanoparticles showed substantial significant inhibition effects against Xoo strain GZ 0006 at a concentration of 16.0 μg/ml, for which the antagonized area was 17, 13, and 13 mm and the biofilm formation was decreased by 74.5, 74.4, and 80.2%, respectively. Moreover, the underlining mechanism of nanoparticles was inferred to be in relation to the reactive oxygen species based on their antibacterial efficiency and the deformity in the cell wall phenomenon. Overall, an attractive and eco-friendly biogenic ZnO, MnO2, and MgO nanoparticles were successfully produced. Altogether, the results suggest that the nanoparticles had an excellent antibacterial efficacy against BLB disease in rice plants, together with the increase in growth parameter and rice biomass. In conclusion, the synthesized nanoparticles could serve as an alternative safe measure in combatting the antibiotic-resistant of Xoo.

scholarly journals Green Synthesis: An Eco-friendly Route for the Synthesis of Iron Oxide Nanoparticles

2021 ◽  
Vol 3 ◽  
Author(s):  
Priya ◽  
Naveen ◽  
Kamaljit Kaur ◽  
Amanpreet K. Sidhu
Keyword(s):  
Iron Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Iron Oxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Green Approach ◽  
Methods Of Synthesis ◽  
Materials Used

Green approach has received major attention for the synthesis of metal oxide nanoparticles. One such metal oxide nanoparticles are iron oxide nanoparticles (IONPs). IONPs have fetched a great deal of interest in recent era because of their magnetic nature, as they can be easily recovered from the reaction mixture by applying an external magnetic field. Although, a variety of chemical and physical methods of synthesis are known, green synthesis is safer, sustainable and biologically acceptable. Plants and microbes are the main biological materials used for the green synthesis. In present review, the synthesis of IONPs by using plants, bacteria, fungi and algae have been highlighted. IONPs produced by plants, fungi, bacteria and algae usually falls in 1–100 nm range and are of distinct shapes like cubic, tetragonal crystalline, spherical, cylindrical, elliptical, octahedral, orthorhombic, hexagonal rods, nanosphere and quasi spherical. Furthermore, these biomaterials play role of reducing, capping, stabilizing and fabricating agents in green synthesis of nanoparticles. The review put forward a comprehensive report of various routes used for synthesizing IONP, biologically. Intuition into the procedures for synthesis of nanoparticles will help to nourish our learning in the area of nanotechnology.

Peptide binding to metal oxide nanoparticles

2017 ◽  
Vol 204 ◽  
pp. 233-250 ◽  
Author(s):  
S. P. Schwaminger ◽  
S. A. Blank-Shim ◽  
I. Scheifele ◽  
P. Fraga-García ◽  
S. Berensmeier
Keyword(s):  
Iron Oxide ◽  
Metal Oxide ◽  
Glutamic Acid ◽  
Magnetite Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Production Costs ◽  
Oxide Surfaces ◽  
Oxide Nanoparticles ◽  
Total Production ◽  
Interaction Patterns

Magnetic metal oxide nanoparticles demonstrate great applicability in several fields such as biotechnology, medicine and catalysis. A stable, magnetic and low-cost material, nanoscale magnetite, is an interesting adsorbent for protein purification. Downstream processing can account for up to 80% of the total production costs in biotechnological production. As such, the development of new innovative separation methods can be regarded as highly profitable. While short peptide sequences can be used as specific affinity tags for functionalised adsorber surfaces, they need expensive affinity ligands on the particle surface for adsorption. In order to identify peptide tags for several non-functionalised inorganic surfaces, different binding conditions to iron oxide nanoparticles are evaluated. Therefore, magnetite nanoparticles in a range of 5–20 nm were synthesised with a co-precipitation method. Zeta potential measurements indicated an amphiphilic surface with an isoelectric point in the neutral pH region. Glutamic acid-based homo-peptides were used as affinity peptides for the magnetite nanoparticles. We demonstrate a dependence of the binding affinity of the peptides on pH and buffer ions in two different experimental set-ups. The nature of surface coordination for glutamic acid-based peptides can be demonstrated with different spectroscopic approaches such as infrared spectroscopy (IR), Raman spectroscopy and circular dichroism spectroscopy (CD). We want to emphasise the importance of physicochemical properties such as surface energy, polarity, morphology and charge. These parameters, which are dependent on the environmental conditions, play a crucial role in peptide interactions with iron oxide surfaces. The understanding of the adsorption of simple biomolecules on nanoscale metal oxide surfaces also represents the key to the even more complex interactions of proteins at the bio-nano interface. From the identification of interaction patterns and an understanding of the adsorption of these peptides, the up-scaling to tagged model proteins facilitates the possibility of an industrial magnetic separation process and might therefore reduce time and costs in purification processes.

scholarly journals Synthesis of Polyaniline Coated Magnesium and Cobalt Oxide Nanoparticles through Eco-Friendly Approach and Their Application as Antifungal Agents

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2669
Author(s):  
Suryyia Manzoor ◽  
Ghazala Yasmin ◽  
Nadeem Raza ◽  
Javier Fernandez ◽  
Rashida Atiq ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Metal Oxide ◽  
Cobalt Oxide ◽  
Metal Oxide Nanoparticles ◽  
Research Work ◽  
Oxide Nanoparticles ◽  
Co3o4 Nanoparticles ◽  
Optimal Conditions ◽  
Time Exposure ◽  
Nanoparticles Concentration

Plant-mediated synthesis of nanoparticles exhibits great potential to minimize the generation of chemical waste through the utilization of non-toxic precursors. In this research work, we report the synthesis of magnesium oxide (MgO) and cobalt oxide (Co3O4) nanoparticles through a green approach using Manilkara zapota leaves extract, their surface modification by polyaniline (PANI), and antifungal properties against Aspergillus niger. Textural and structural characterization of modified and unmodified metal oxide nanoparticles were evaluated using FT-IR, SEM, and XRD. The optimal conditions for inhibition of Aspergillus niger were achieved by varying nanoparticles’ concentration and time exposure. Results demonstrate that PANI/MgO nanoparticles were superior in function relative to PANI/Co3O4 nanoparticles to control the growth rate of Aspergillus niger at optimal conditions (time exposure of 72 h and nanoparticles concentration of 24 mM). A percentage decrease of 73.2% and 65.1% in fungal growth was observed using PANI/MgO and PANI/Co3O4 nanoparticles, respectively, which was higher than the unmodified metal oxide nanoparticles (67.5% and 63.2%).

scholarly journals Green Synthesis of Metal Oxide Nanoparticles and Studies of Their Antibacterial Efficacy against Common Pathogens

2019 ◽  
Vol 3 (1) ◽  
Keyword(s):  
Iron Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Iron Oxide Nanoparticles ◽  
Plant Extract ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Antibacterial Efficacy ◽  
Gold And Silver Nanoparticles ◽  
Copper Zinc

Green synthesis of metal oxide nanoparticles has been emerging highlight of the research owing to its unique properties that make them applicable in various fields of science and technology. The method of synthesis is simple, cost effective and environmental friendly. After review, we reported the phyto-synthesis of metal oxide nanoparticles using plant extract with an emphasis on recent developments. Biomolecules such as alkaloids, flavonoids, polyphenols etc. present in the plant extract can be used for the reduction of metal ions to nanoparticles in a single step process. These extract also act as a stabilizing agent. Although, a good number of work has been reported for the synthesis of gold and silver nanoparticles. However, limited no of work has been reported for the synthesis of copper, zinc and iron oxide nanoparticles. We have discussed the green synthesis of copper, zinc and iron oxide nanoparticles and potential of their antibacterial efficacy

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