Pub Date : 2021-07-01DOI: 10.26655/AJNANOMAT.2021.3.1
B. Baghernejad, Saman Parhizgar
Coumarin derivatives have been widely utilized as agrochemicals, cosmetics, and pigments, demonstrating broad spectrum biological and pharmacological activities. In this research study, we reported an efficient and environmentally benign one-pot multi–component reaction for the synthesis of bis(4-hydroxylcoumarin) methanes derivatives from the reaction of 4-hydroxycoumarin and aromatic aldehydes in the presence of a catalytic amount of nano- CuO/CeO2. The advantages of this method are including, good yields (92-97%), short reaction times, simple work-up and reusable catalyst. The catalyst could be recycled and reused for five times without much loss in its activity. As is evident from this research study, the best efficiency for the synthesis of bis(4-hydroxylcoumarin) methanes is achieved with the nano-CuO/CeO2 catalyst in the shortest time.
{"title":"Synthesis of bis(4-hydroxycoumarin)methanes using nano-CuO/CeO2 as recyclable catalyst","authors":"B. Baghernejad, Saman Parhizgar","doi":"10.26655/AJNANOMAT.2021.3.1","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.3.1","url":null,"abstract":"Coumarin derivatives have been widely utilized as agrochemicals, cosmetics, and pigments, demonstrating broad spectrum biological and pharmacological activities. In this research study, we reported an efficient and environmentally benign one-pot multi–component reaction for the synthesis of bis(4-hydroxylcoumarin) methanes derivatives from the reaction of 4-hydroxycoumarin and aromatic aldehydes in the presence of a catalytic amount of nano- CuO/CeO2. The advantages of this method are including, good yields (92-97%), short reaction times, simple work-up and reusable catalyst. The catalyst could be recycled and reused for five times without much loss in its activity. As is evident from this research study, the best efficiency for the synthesis of bis(4-hydroxylcoumarin) methanes is achieved with the nano-CuO/CeO2 catalyst in the shortest time.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75463281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-01Epub Date: 2021-05-27DOI: 10.26655/AJNANOMAT.2021.3.5
Perihan Unak, Rachel Hepton, Max Harper, Volkan Yasakci, Gillian Pearce, Steve Russell, Omer Aras, Oguz Akin, Julian Wong
Iron nanoparticles (MNPs) are known to induce membrane damage and apoptosis of cancer cells. In our study we determined whether FDG coupled with iron oxide magnetic nanoparticles can exert the same destructive effect on cancer cells. This research study presents data involving NIC-H727 human lung, bronchus epithelial cells exposed to conjugated fluorodeoxyglucose conjugated with iron-oxide magnetic nanoparticles and indocyanine green (ICG) dye (FDG-MNP-ICG), with and without the application of a magnetic field. Cell viability inferred from MTT assay revealed that FDG-MNPs had no significant toxicity towards noncancerous NIC-H727 human lung, bronchus epithelial cells. However, percentage cell death was much higher using a magnetic field, for the concentration of FDG-MNP-ICC used in our experiments. Magnetic field was able to destroy cells containing MNPs, while MNPs alone had significantly lower effects. Additionally, MNPs alone in these low concentrations had less adverse effects on healthy (non-target) cells.
{"title":"Toxicity testing of indocyanine green and fluorodeoxyglucose conjugated iron oxide nanoparticles with and without exposure to a magnetic field.","authors":"Perihan Unak, Rachel Hepton, Max Harper, Volkan Yasakci, Gillian Pearce, Steve Russell, Omer Aras, Oguz Akin, Julian Wong","doi":"10.26655/AJNANOMAT.2021.3.5","DOIUrl":"10.26655/AJNANOMAT.2021.3.5","url":null,"abstract":"<p><p>Iron nanoparticles (MNPs) are known to induce membrane damage and apoptosis of cancer cells. In our study we determined whether FDG coupled with iron oxide magnetic nanoparticles can exert the same destructive effect on cancer cells. This research study presents data involving NIC-H727 human lung, bronchus epithelial cells exposed to conjugated fluorodeoxyglucose conjugated with iron-oxide magnetic nanoparticles and indocyanine green (ICG) dye (FDG-MNP-ICG), with and without the application of a magnetic field. Cell viability inferred from MTT assay revealed that FDG-MNPs had no significant toxicity towards noncancerous NIC-H727 human lung, bronchus epithelial cells. However, percentage cell death was much higher using a magnetic field, for the concentration of FDG-MNP-ICC used in our experiments. Magnetic field was able to destroy cells containing MNPs, while MNPs alone had significantly lower effects. Additionally, MNPs alone in these low concentrations had less adverse effects on healthy (non-target) cells.</p>","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10773553/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75820774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-01DOI: 10.26655/AJNANOMAT.2021.3.7
Sabah Salahvarzi, Keyhan Mohammadpour, Zeynab Dadgar
In this work, the interaction between curcumin and hydrazine was studied in three different conditions: In the presence of ultrasonic waves, in the absence of ultrasonic waves, and while refluxing and the effects of the produced materials on the livability of bone marrow mesenchymal stem cells were investigated. Various methods including FT-IR, 1H NMR and 13C NMR were utilized to characterize the material. The results revealed that cell treatments with 40 μM dose of all three samples after 24 h were caused to the more biological ability of rat bone marrow mesenchymal stem cells (MSCs). This indicated that these compounds (curcumin-hydrazine) are effective in the livability of bone marrow mesenchymal stem cells (MSCs).
{"title":"The reaction of curcumin-hydrazine and its effect on bone marrow mesenchymal stem cells","authors":"Sabah Salahvarzi, Keyhan Mohammadpour, Zeynab Dadgar","doi":"10.26655/AJNANOMAT.2021.3.7","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.3.7","url":null,"abstract":"In this work, the interaction between curcumin and hydrazine was studied in three different conditions: In the presence of ultrasonic waves, in the absence of ultrasonic waves, and while refluxing and the effects of the produced materials on the livability of bone marrow mesenchymal stem cells were investigated. Various methods including FT-IR, 1H NMR and 13C NMR were utilized to characterize the material. The results revealed that cell treatments with 40 μM dose of all three samples after 24 h were caused to the more biological ability of rat bone marrow mesenchymal stem cells (MSCs). This indicated that these compounds (curcumin-hydrazine) are effective in the livability of bone marrow mesenchymal stem cells (MSCs).","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79106903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-01DOI: 10.26655/AJNANOMAT.2021.3.2
E. Rezaei-Aghdam, A. Shamel, M. Khodadadi-Moghaddam, Gholamreza Ebrahimzadeh-Rajaei, S. Mohajeri
This study focuses on the utilization of ZnO (as synthetic) and mango peel (natural adsorbent) to remove blue 221 dye from aqueous solutions. First, ZnO nanoparticles (NPs) were synthesized and detected using the descriptor-based techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), N2 adsorption/desorption isotherms (BET), and X-ray diffraction (XRD). Various operational parameters including adsorbent concentration, pH, adsorbent dose, contact time, and stirring speed were investigated. The obtained kinetic results demonstrated great compatibility of the pseudo-second-order model with the experimental data. The effects of thermodynamic parameters were calculated to confirm the endothermic, spontaneous and physical nature of adsorption process. Langmuir and Freundlich isotherm models were utilized to fit the obtained equilibrium data. Freundlich model was found sufficient to explain the adsorption of blue 221 dye by ZnO NPs and mango peel. The results indicated that the ZnO NPs performed better in blue 221 dye removal as compared with mango peel. The mean size of ZnO NPs was found to be 22.16 nm. The specific surface area of ZnO NPs was obtained 26.85 m2.g-1 and pore volume and pore-size were 0.0581 cm3.g-1 and 1.22 nm, respectively. The maximum adsorption capacity of blue 221 dye on ZnO NPs and mango peel was estimated as 133.33 and 476.19 mg.g-1, respectively.
{"title":"Hydrothermal synthesis of ZnO nanoparticles and comparison of its adsorption characteristics with the natural adsorbent (mango peel)","authors":"E. Rezaei-Aghdam, A. Shamel, M. Khodadadi-Moghaddam, Gholamreza Ebrahimzadeh-Rajaei, S. Mohajeri","doi":"10.26655/AJNANOMAT.2021.3.2","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.3.2","url":null,"abstract":"This study focuses on the utilization of ZnO (as synthetic) and mango peel (natural adsorbent) to remove blue 221 dye from aqueous solutions. First, ZnO nanoparticles (NPs) were synthesized and detected using the descriptor-based techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), N2 adsorption/desorption isotherms (BET), and X-ray diffraction (XRD). Various operational parameters including adsorbent concentration, pH, adsorbent dose, contact time, and stirring speed were investigated. The obtained kinetic results demonstrated great compatibility of the pseudo-second-order model with the experimental data. The effects of thermodynamic parameters were calculated to confirm the endothermic, spontaneous and physical nature of adsorption process. Langmuir and Freundlich isotherm models were utilized to fit the obtained equilibrium data. Freundlich model was found sufficient to explain the adsorption of blue 221 dye by ZnO NPs and mango peel. The results indicated that the ZnO NPs performed better in blue 221 dye removal as compared with mango peel. The mean size of ZnO NPs was found to be 22.16 nm. The specific surface area of ZnO NPs was obtained 26.85 m2.g-1 and pore volume and pore-size were 0.0581 cm3.g-1 and 1.22 nm, respectively. The maximum adsorption capacity of blue 221 dye on ZnO NPs and mango peel was estimated as 133.33 and 476.19 mg.g-1, respectively.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91504671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-27DOI: 10.26655/AJNANOMAT.2021.3.6
F. Piri, Maria Merajoddin, Somayyeh Piri, Zahra Mokarian
This work introduces a simple method to prepare WO3 nanoparticles via tungsten rod electrooxidation in the presence of NaCl solution as an electrolyte. In this process, WO3 nanoparticles with sizes between 10nm and 20 nm were prepared and characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDX) techniques. WO3 nanoparticles are used to modify polysiloxane surface. The WO3 coated polysiloxane surface showed a very high-water contact angle of 158°.
{"title":"Synthesis WO3 nanoparticle via the electrochemical method and study its super-hydrophobicity properties","authors":"F. Piri, Maria Merajoddin, Somayyeh Piri, Zahra Mokarian","doi":"10.26655/AJNANOMAT.2021.3.6","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.3.6","url":null,"abstract":"This work introduces a simple method to prepare WO3 nanoparticles via tungsten rod electrooxidation in the presence of NaCl solution as an electrolyte. In this process, WO3 nanoparticles with sizes between 10nm and 20 nm were prepared and characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDX) techniques. WO3 nanoparticles are used to modify polysiloxane surface. The WO3 coated polysiloxane surface showed a very high-water contact angle of 158°.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79520866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-21DOI: 10.26655/ajnanomat.2021.3.4
Monika S. Patel, Sunita Mishra
Particle encapsulation is a standard process within the food industry that consists of encapsulating particles within a protective layer, to shield a sensitive ingredient or nucleus from adverse reactions. This consists of encapsulating small particle cores within a protective wall this protective layer may preserve the organoleptic and physico-chemical properties of the products also on improve the palatability of volatile odorous ingredients. Encapsulation of flavors and aromas may be a rapidly expanding process within the food industry. Many aroma compounds must to be converted into solid products before its use as flavouring agents. Nano and microencapsulation technology is very promising area in food industry, which can have an excellent impact on a many category of products including functional foods, packaging, preservatives, antioxidants, flavors and fragrances. Finally, a number of the main challenges within the design and fabrication of nanocapsules & its application in food sector and characterization are highlighted.
{"title":"A review: Application and production of nanoencapsulation in the food sector","authors":"Monika S. Patel, Sunita Mishra","doi":"10.26655/ajnanomat.2021.3.4","DOIUrl":"https://doi.org/10.26655/ajnanomat.2021.3.4","url":null,"abstract":"Particle encapsulation is a standard process within the food industry that consists of encapsulating particles within a protective layer, to shield a sensitive ingredient or nucleus from adverse reactions. This consists of encapsulating small particle cores within a protective wall this protective layer may preserve the organoleptic and physico-chemical properties of the products also on improve the palatability of volatile odorous ingredients. Encapsulation of flavors and aromas may be a rapidly expanding process within the food industry. Many aroma compounds must to be converted into solid products before its use as flavouring agents. Nano and microencapsulation technology is very promising area in food industry, which can have an excellent impact on a many category of products including functional foods, packaging, preservatives, antioxidants, flavors and fragrances. Finally, a number of the main challenges within the design and fabrication of nanocapsules & its application in food sector and characterization are highlighted.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78832263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-18DOI: 10.26655/AJNANOMAT.2021.3.3
S. O. Mirabootalebi, Gholam-Hosein Akbari Fakhrabadi, R. M. Babaheydari
Carbon nanotubes (CNTs) have specific physical properties that make them one of the ideal nano-materials for electronics, magnetic, and optical applications. Produced CNTs via mechanothermal method have a springy and coil-like structure, affecting their physical characteristics and distinguishes them from other carbon nanotubes. In this research study, the optical and magnetic properties of fabricated carbon nanotubes by mechanothermal method were investigated. For this purpose, carbon nanotubes were synthesized by heat treatment of ball-milled graphite powders at 1400 ˚C in the atmosphere of argon. The quality and structure of milled-graphite and the CNTs were investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Raman spectroscopy. Then, the optical and magnetic properties of the fabricated CNTs were assessed by UV-VIS spectrometer and vibrating-sample magnetometer (VSM), respectively. The results of the absorption spectra revealed that the products had not any absorption peak at the visible regime. Furthermore, magnetization curves indicate that coercivity (Hci), magnetization (Ms), and retentivity (Mr) of the CNTs were found to be 84.183 G, 20.531, and 0.73511 emu/g, respectively.
{"title":"Investigation on physical properties of carbon nanotubes prepared by mechanothermal method","authors":"S. O. Mirabootalebi, Gholam-Hosein Akbari Fakhrabadi, R. M. Babaheydari","doi":"10.26655/AJNANOMAT.2021.3.3","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.3.3","url":null,"abstract":"Carbon nanotubes (CNTs) have specific physical properties that make them one of the ideal nano-materials for electronics, magnetic, and optical applications. Produced CNTs via mechanothermal method have a springy and coil-like structure, affecting their physical characteristics and distinguishes them from other carbon nanotubes. In this research study, the optical and magnetic properties of fabricated carbon nanotubes by mechanothermal method were investigated. For this purpose, carbon nanotubes were synthesized by heat treatment of ball-milled graphite powders at 1400 ˚C in the atmosphere of argon. The quality and structure of milled-graphite and the CNTs were investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Raman spectroscopy. Then, the optical and magnetic properties of the fabricated CNTs were assessed by UV-VIS spectrometer and vibrating-sample magnetometer (VSM), respectively. The results of the absorption spectra revealed that the products had not any absorption peak at the visible regime. Furthermore, magnetization curves indicate that coercivity (Hci), magnetization (Ms), and retentivity (Mr) of the CNTs were found to be 84.183 G, 20.531, and 0.73511 emu/g, respectively.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90184975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.26655/AJNANOMAT.2021.2.7
B. Baghernejad, M. Fiuzat
A nano-SnO2 catalyzed environmentally benign strategy for the synthesis of 2-amino-4H-pyran derivatives via the multi-component reaction between aryl aldehydes, β-dicarbonyl compounds and malononitrile in aqueous media under reflux conditions in excellent yields is established. The structures of the synthesized compounds were confirmed using IR, 1H-NMR. The elemental analysis and morphology of the catalyst was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). This one-pot three component protocol provides an efficient improved pathway for the synthesis of pyrans in the terms of short reaction times, simple working up procedure and recyclability of catalyst.
{"title":"Synthesis of 2-amino-4H-pyran derivatives in aqueous media with nano-SnO2 as recyclable catalyst","authors":"B. Baghernejad, M. Fiuzat","doi":"10.26655/AJNANOMAT.2021.2.7","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.2.7","url":null,"abstract":"A nano-SnO2 catalyzed environmentally benign strategy for the synthesis of 2-amino-4H-pyran derivatives via the multi-component reaction between aryl aldehydes, β-dicarbonyl compounds and malononitrile in aqueous media under reflux conditions in excellent yields is established. The structures of the synthesized compounds were confirmed using IR, 1H-NMR. The elemental analysis and morphology of the catalyst was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). This one-pot three component protocol provides an efficient improved pathway for the synthesis of pyrans in the terms of short reaction times, simple working up procedure and recyclability of catalyst.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81213446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.26655/AJNANOMAT.2021.2.6
K. Dey, S. Paul, P. Ghosh
Recently, polymer nanocomposites have attracted greater interest as lubricant additives compared to pure polymer. In this work, we synthesized ZnO nanoparticles and characterized them using scanning electron microscope(SEM) and X-ray diffraction (XRD) analysis. The synthesized nanoparticles were then incorporated into the poly dodecylacylate to prepare polymer nanocomposites (PNCs) by sonication. The PNC was characterized using different analytical techniques like FT-IR, NMR, TGA etc. The additive performance of the PNC as viscosity index improver, pour point depressant and anti-wear were evaluated using the standard ASTM methods. The results demonstrated that, the overall performance of the additive was improved byincreasing the concentration of PNC in the base stock. It was observed that PNCs have shown good viscosity modifier characteristics as one of the composite having higher nanoparticles content shown viscosity index value of 137, which is higher than neat polymer. Moreover, up to 28% decrease in wear reduction was observed by applying the PNC.
{"title":"Multifunctional additive properties of acrylate based ZnO Nano composite for lubricating oil","authors":"K. Dey, S. Paul, P. Ghosh","doi":"10.26655/AJNANOMAT.2021.2.6","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.2.6","url":null,"abstract":"Recently, polymer nanocomposites have attracted greater interest as lubricant additives compared to pure polymer. In this work, we synthesized ZnO nanoparticles and characterized them using scanning electron microscope(SEM) and X-ray diffraction (XRD) analysis. The synthesized nanoparticles were then incorporated into the poly dodecylacylate to prepare polymer nanocomposites (PNCs) by sonication. The PNC was characterized using different analytical techniques like FT-IR, NMR, TGA etc. The additive performance of the PNC as viscosity index improver, pour point depressant and anti-wear were evaluated using the standard ASTM methods. The results demonstrated that, the overall performance of the additive was improved byincreasing the concentration of PNC in the base stock. It was observed that PNCs have shown good viscosity modifier characteristics as one of the composite having higher nanoparticles content shown viscosity index value of 137, which is higher than neat polymer. Moreover, up to 28% decrease in wear reduction was observed by applying the PNC.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80270619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-01DOI: 10.26655/ajnanomat.2021.2.3
E. Ezzatzadeh
In the present study, Zn–DABCO@Fe3O4 with a high surface area and readily was synthesized. The morphology, particle size distribution, and phase analysis of the Zn–DABCO@Fe3O4 nanopowders were characterized using the scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD) analysis. The prepared Zn–DABCO@Fe3O4 nanoparticle was utilized as efficient catalyst for selective oxidation of sulfides to sulfoxides using 30% H2O2 as oxidant. The products were achieved with good to excellent yields at room temperature with no over-oxidation of sulfoxides and disulfides to unexpected by-products. This catalyst can be magnetically recovered by applying an external magnet and reused for eight continuous cycles in both oxidation reactions without a notable loss in its catalytic activity. Furthermore, the oxidation of various sulfides was highly chemoselective, but O,O-acetals remained intact under the described reaction conditions.
{"title":"Chemoselective oxidation of sulfides to sulfoxides using a novel Zn-DABCO functionalized Fe3O4 MNPs as highly effective nanomagnetic catalyst","authors":"E. Ezzatzadeh","doi":"10.26655/ajnanomat.2021.2.3","DOIUrl":"https://doi.org/10.26655/ajnanomat.2021.2.3","url":null,"abstract":"In the present study, Zn–DABCO@Fe3O4 with a high surface area and readily was synthesized. The morphology, particle size distribution, and phase analysis of the Zn–DABCO@Fe3O4 nanopowders were characterized using the scanning electron microscope (SEM), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD) analysis. The prepared Zn–DABCO@Fe3O4 nanoparticle was utilized as efficient catalyst for selective oxidation of sulfides to sulfoxides using 30% H2O2 as oxidant. The products were achieved with good to excellent yields at room temperature with no over-oxidation of sulfoxides and disulfides to unexpected by-products. This catalyst can be magnetically recovered by applying an external magnet and reused for eight continuous cycles in both oxidation reactions without a notable loss in its catalytic activity. Furthermore, the oxidation of various sulfides was highly chemoselective, but O,O-acetals remained intact under the described reaction conditions.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80338535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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