Pub Date : 2020-01-01DOI: 10.22052/JNS.2020.01.009
P. Safaei, S. Sepahvand, Fatemeh Hossieni, S. Ghasemi, Z. Sanaee
Lithium-Sulfur (Li-S) batteries are considered as one of the promising candidates for next-generation Li batteries in near future. Although, these batteries are suffering from certain drawbacks such as rapid capacity fading during the charge and discharge process due to the dissolution of polysulfides. In this paper, Sulfur/metal oxide (TiO2 and SiO2) yolk–shell structures have been successfully synthesized and utilized to overcome this problem and improve the electrochemical performance of sulfur cahtode material. Prepared materials have been characterized using Scanning Electron Microscopy(SEM), Transmission Electron Microscopy(TEM) and X-ray diffraction (XRD) techniques. The results show significant improvement in the battery performance as a result of using Sulfur-SiO2 and Sulfur-TiO2 yolk–shell structures. The obtained Sulfur-TiO2 electrode delivers a high initial discharge capacity (>2000 mA h g−1) and discharge capacity of 250 mA h g−1 over 8 charging/discharging cycles with Coulombic efficiency of 60%, while initial discharge capacity for Sulfur-SiO2 electrode was lower (>1000 mA h g−1) compared to Sulfur-TiO2. Sulfur-SiO2 electrode shows the discharge capacity of 200 mA h g−1 over 8 charging/discharging cycles with Coulombic efficiency around70%. The obtained galvanostatic ressults demonstrated that Sulfur-TiO2 electrode possess stronger capability to prevent sulfur and its intermediate reaction products from dissolving into the electrolyte.
锂硫电池(Li-硫电池)被认为是在不久的将来有希望成为下一代锂电池的候选者之一。然而，由于多硫化物的溶解，这些电池在充放电过程中存在容量快速衰减的缺点。本文成功合成并利用硫/金属氧化物(TiO2和SiO2)的蛋黄壳结构，克服了这一问题，提高了硫阴极材料的电化学性能。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和x射线衍射(XRD)技术对制备的材料进行了表征。结果表明，采用硫- sio2和硫- tio2蛋黄壳结构可以显著提高电池的性能。所制备的硫- tio2电极具有较高的初始放电容量(>2000 mA h g−1)和250 mA h g−1的放电容量(8次充放电循环)，库伦效率为60%，而硫- sio2电极的初始放电容量(>1000 mA h g−1)低于硫- tio2。在8次充放电循环中，硫- sio2电极的放电容量为200 mA h g−1，库仑效率约为70%。得到的恒流结果表明，硫- tio2电极具有较强的阻止硫及其中间反应产物溶解到电解质中的能力。
{"title":"Improving the performance of Lithium-Sulfur Batteries using Sulfur-(TiO2/SiO2) yolk–shell Nanostructure","authors":"P. Safaei, S. Sepahvand, Fatemeh Hossieni, S. Ghasemi, Z. Sanaee","doi":"10.22052/JNS.2020.01.009","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.009","url":null,"abstract":"Lithium-Sulfur (Li-S) batteries are considered as one of the promising candidates for next-generation Li batteries in near future. Although, these batteries are suffering from certain drawbacks such as rapid capacity fading during the charge and discharge process due to the dissolution of polysulfides. In this paper, Sulfur/metal oxide (TiO2 and SiO2) yolk–shell structures have been successfully synthesized and utilized to overcome this problem and improve the electrochemical performance of sulfur cahtode material. Prepared materials have been characterized using Scanning Electron Microscopy(SEM), Transmission Electron Microscopy(TEM) and X-ray diffraction (XRD) techniques. The results show significant improvement in the battery performance as a result of using Sulfur-SiO2 and Sulfur-TiO2 yolk–shell structures. The obtained Sulfur-TiO2 electrode delivers a high initial discharge capacity (>2000 mA h g−1) and discharge capacity of 250 mA h g−1 over 8 charging/discharging cycles with Coulombic efficiency of 60%, while initial discharge capacity for Sulfur-SiO2 electrode was lower (>1000 mA h g−1) compared to Sulfur-TiO2. Sulfur-SiO2 electrode shows the discharge capacity of 200 mA h g−1 over 8 charging/discharging cycles with Coulombic efficiency around70%. The obtained galvanostatic ressults demonstrated that Sulfur-TiO2 electrode possess stronger capability to prevent sulfur and its intermediate reaction products from dissolving into the electrolyte.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"76-82"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68410905","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.012
Asadollah Beiraghi, Seyed Ali Najibi-Gehraz
In this work, we describe a simple, green and general procedure for the purification and fractionation of carbon dots (CDs). CDs coated with oxygen-containing functional groups were synthesized by thermal pyrolysis of citric acid. The product of the reaction was first Purified and then fractionated into two distinct kinds of CDs (f4 and f1) using pH-controlled cloud point extraction (CPE) technique. Characterization of f4 and f1 fractions by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption, and FT-IR spectroscopy not only lead to study and explain the mechanism of the extraction procedure but also revealed that the two fractions were different from each other in terms of their different optical properties and surface chemistry (the number or surface-density of oxygen-containing functional groups) which in turn plays the main role in their fractionation at different pH values. Comparing fluorescence spectra of f4 and f1 fractions indicated that the surface-density or number of the oxygen-containing functional groups has a marked effect on photoluminescence behavior of CDs. The developed general procedure method can be used for large-scale production of different fractions of any pure CDs in the industry as well as research laboratory preparation purposes.
{"title":"Purification and Fractionation of Carbon Dots using pH-controlled Cloud Point Extraction Technique","authors":"Asadollah Beiraghi, Seyed Ali Najibi-Gehraz","doi":"10.22052/JNS.2020.01.012","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.012","url":null,"abstract":"In this work, we describe a simple, green and general procedure for the purification and fractionation of carbon dots (CDs). CDs coated with oxygen-containing functional groups were synthesized by thermal pyrolysis of citric acid. The product of the reaction was first Purified and then fractionated into two distinct kinds of CDs (f4 and f1) using pH-controlled cloud point extraction (CPE) technique. Characterization of f4 and f1 fractions by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption, and FT-IR spectroscopy not only lead to study and explain the mechanism of the extraction procedure but also revealed that the two fractions were different from each other in terms of their different optical properties and surface chemistry (the number or surface-density of oxygen-containing functional groups) which in turn plays the main role in their fractionation at different pH values. Comparing fluorescence spectra of f4 and f1 fractions indicated that the surface-density or number of the oxygen-containing functional groups has a marked effect on photoluminescence behavior of CDs. The developed general procedure method can be used for large-scale production of different fractions of any pure CDs in the industry as well as research laboratory preparation purposes.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"107-118"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68410681","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.017
Sahar Mohseni, M. Sabet, S. Saeednia, M. Ahmadi
In this experimental work, nitrogen-doped carbon quantum dots were successfully synthesized with hydrothermal of the milk. The product was composed of a powder and a stable colloid. The structure of the product was examined by XRD, EDS and FT-IR analysis. Also the particle size of the product was investigated by SEM and TEM images and the results showed the product is mainly composed of the particles with less than 5 nm in diameter. The photoluminescence intensity of the product was obtained by PL analysis and it was found the product has high photoluminescence intensity that can be improved by surface modification with N-Methyl-2-pyrrolidone. Due to high photoluminescence intensity of the obtained quantum dots they were used as sensor to detection of Cu2+ and it was observed they can detect this ion in the aqueous medium for 0-80 uM concentration range. Also it was found by surface modification of carbon dots with N-Methyl-2-pyrrolidone, the detection sensitivity is improved. The optical properties of the product were studied by UV-Vis spectroscopy.
{"title":"Detection of Cu2+, Degradation of Acid Brown and Removing Cd2+ from the Water by High Photoluminescence Carbon Dots Synthesized from Milk","authors":"Sahar Mohseni, M. Sabet, S. Saeednia, M. Ahmadi","doi":"10.22052/JNS.2020.01.017","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.017","url":null,"abstract":"In this experimental work, nitrogen-doped carbon quantum dots were successfully synthesized with hydrothermal of the milk. The product was composed of a powder and a stable colloid. The structure of the product was examined by XRD, EDS and FT-IR analysis. Also the particle size of the product was investigated by SEM and TEM images and the results showed the product is mainly composed of the particles with less than 5 nm in diameter. The photoluminescence intensity of the product was obtained by PL analysis and it was found the product has high photoluminescence intensity that can be improved by surface modification with N-Methyl-2-pyrrolidone. Due to high photoluminescence intensity of the obtained quantum dots they were used as sensor to detection of Cu2+ and it was observed they can detect this ion in the aqueous medium for 0-80 uM concentration range. Also it was found by surface modification of carbon dots with N-Methyl-2-pyrrolidone, the detection sensitivity is improved. The optical properties of the product were studied by UV-Vis spectroscopy.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"157-166"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411471","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.001
A. Ebadi, M. Mozaffari
In this research, Ag/ZnO nanocomposites were prepared and characterized by transition electron microscopy (TEM), the energy dispersive X-ray spectrum (EDS) and X-ray diffraction patterns (XRD). These nanocomposites were used as catalysts for the oxidation of toluene to benzaldehyde and benzoic acid with hydrogen peroxide (H2O2) and tert-butylhydroperoxide (TBHP) as oxidizing agent in the liquid phase. For these Ag/ZnO nanocomposites, acetonitrile was used as a solvent, since all the reagents dissolved and show the highest yields. The oxidation products of toluene are benzaldehyde and benzoic acid. The results of this study showed that oxidant and the catalyst type affected the efficiency of toluene oxidation. TBHP was found to be better oxidizing agent than H2O2 since higher efficiency of product were observed when TBHP was used. The catalytic performance of 2.5%Ag/ZnO nanocomposite was better than the 1% and 5%Ag/ZnO nanocomposites. Under the optimal reaction conditions, the catalytic system of 2.5%Ag/ZnO nanocomposite gave about 76.3% efficiency of toluene.
{"title":"Ag/ZnO Nanocomposites: Preparation, Characterization and Investigation of the Catalytic Activity for Oxidation of Toluene in Liquid Phase","authors":"A. Ebadi, M. Mozaffari","doi":"10.22052/JNS.2020.01.001","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.001","url":null,"abstract":"In this research, Ag/ZnO nanocomposites were prepared and characterized by transition electron microscopy (TEM), the energy dispersive X-ray spectrum (EDS) and X-ray diffraction patterns (XRD). These nanocomposites were used as catalysts for the oxidation of toluene to benzaldehyde and benzoic acid with hydrogen peroxide (H2O2) and tert-butylhydroperoxide (TBHP) as oxidizing agent in the liquid phase. For these Ag/ZnO nanocomposites, acetonitrile was used as a solvent, since all the reagents dissolved and show the highest yields. The oxidation products of toluene are benzaldehyde and benzoic acid. The results of this study showed that oxidant and the catalyst type affected the efficiency of toluene oxidation. TBHP was found to be better oxidizing agent than H2O2 since higher efficiency of product were observed when TBHP was used. The catalytic performance of 2.5%Ag/ZnO nanocomposite was better than the 1% and 5%Ag/ZnO nanocomposites. Under the optimal reaction conditions, the catalytic system of 2.5%Ag/ZnO nanocomposite gave about 76.3% efficiency of toluene.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"1-8"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68410356","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.008
Z. Rafiei-Sarmazdeh, S. Jafari, S. Ahmadi
The lack of a high-yield, renewable and low-cost synthesis method limits the potential applications of boron nitride with impressive characterizations. In this study, a facile method is developed for the preparation of chemically functionalized boron nitride nanosheets (BNNSs) by considering the quantity and quality of chemical materials involved in the synthesis process. The proposed green method is a suitable and high-efficiency method for replacing other production methods of BNNSs. Ultrathin BNNSs is produced by chemical reactions and subsequent liquid exfoliation. The possibility of chemical reaction is the highest at the defect sites especially at the upper/lower surfaces as well as the edge of bulk material. Due to hydroxyl functional groups that are coupled to the surface during the synthesis, the obtained products can well be dispersed in polar solutions such as water, ethanol, acetone and isopropyl alcohol. AFM, TEM, and SEM techniques are utilized to confirm the quality of the used method and illustrated that the produced-BNNSs have minimum thicknesses in the range of 1–5.6 nm and with lateral sizes ranging from 0.8–2.5 μm. The existence of functional groups and the structure of the BNNSs are verified by FTIR, EDX, XPS, XRD and Raman analyses. It was seen that the hexagonal structure was retained during the functionalization procedure. One can expect that the functionalization and sonication process introduces functional groups onto the surface of BNNSs. By this method, the obtained yield of BN dispersion is improved up to 17-20%.
{"title":"A green chemistry approach for facile synthesis of functionalized boron nitride nanosheets","authors":"Z. Rafiei-Sarmazdeh, S. Jafari, S. Ahmadi","doi":"10.22052/JNS.2020.01.008","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.008","url":null,"abstract":"The lack of a high-yield, renewable and low-cost synthesis method limits the potential applications of boron nitride with impressive characterizations. In this study, a facile method is developed for the preparation of chemically functionalized boron nitride nanosheets (BNNSs) by considering the quantity and quality of chemical materials involved in the synthesis process. The proposed green method is a suitable and high-efficiency method for replacing other production methods of BNNSs. Ultrathin BNNSs is produced by chemical reactions and subsequent liquid exfoliation. The possibility of chemical reaction is the highest at the defect sites especially at the upper/lower surfaces as well as the edge of bulk material. Due to hydroxyl functional groups that are coupled to the surface during the synthesis, the obtained products can well be dispersed in polar solutions such as water, ethanol, acetone and isopropyl alcohol. AFM, TEM, and SEM techniques are utilized to confirm the quality of the used method and illustrated that the produced-BNNSs have minimum thicknesses in the range of 1–5.6 nm and with lateral sizes ranging from 0.8–2.5 μm. The existence of functional groups and the structure of the BNNSs are verified by FTIR, EDX, XPS, XRD and Raman analyses. It was seen that the hexagonal structure was retained during the functionalization procedure. One can expect that the functionalization and sonication process introduces functional groups onto the surface of BNNSs. By this method, the obtained yield of BN dispersion is improved up to 17-20%.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"64-75"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68410884","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.003
S. Modi, M. Fulekar
Plant-mediated synthesis of metal oxide nanoparticles is a promising alternative to the traditional method of physical and chemical synthesis. In this paper, we report the green synthesis of zinc oxide nanoparticles (ZnONPs) by a biological method. During the study, Zinc oxide nanoparticles were synthesized by Allium sativum skin (garlic skin) extract. Formation of zinc oxide nanoparticles has been confirmed by UV-visible spectroscopy, UV diffuse reflectance spectroscopy (UV-DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope with Energy dispersive X-ray studies (EDX) and transmission electron microscope (TEM), Atomic force Microscopy (AFM), Brunauer-Emmet-Teller (BET), Thermogravimetric analysis (TGA). UV-vis spectroscopy confirms the synthesis of zinc oxide nanoparticles and showed the characteristic of absorption peak at 370nm. The scanning electron microscope and Transmission electron microscope confirms the formation of the rod and hexagonal shaped nanoparticles having average size 7.77 nm. Energy dispersive X-ray analysis states the formation of highly pure zinc oxide nanoparticles. The zinc oxide nanoparticles synthesized using garlic skin are expected to have applications in biotechnology, biomedical, catalysis, coatings, sensors and water remediation. This green approach for the synthesis is a cheap, novel, eco friendly and convenient method.
{"title":"Green Synthesis of Zinc Oxide Nanoparticles using Garlic skin extract and Its Characterization","authors":"S. Modi, M. Fulekar","doi":"10.22052/JNS.2020.01.003","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.003","url":null,"abstract":"Plant-mediated synthesis of metal oxide nanoparticles is a promising alternative to the traditional method of physical and chemical synthesis. In this paper, we report the green synthesis of zinc oxide nanoparticles (ZnONPs) by a biological method. During the study, Zinc oxide nanoparticles were synthesized by Allium sativum skin (garlic skin) extract. Formation of zinc oxide nanoparticles has been confirmed by UV-visible spectroscopy, UV diffuse reflectance spectroscopy (UV-DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope with Energy dispersive X-ray studies (EDX) and transmission electron microscope (TEM), Atomic force Microscopy (AFM), Brunauer-Emmet-Teller (BET), Thermogravimetric analysis (TGA). UV-vis spectroscopy confirms the synthesis of zinc oxide nanoparticles and showed the characteristic of absorption peak at 370nm. The scanning electron microscope and Transmission electron microscope confirms the formation of the rod and hexagonal shaped nanoparticles having average size 7.77 nm. Energy dispersive X-ray analysis states the formation of highly pure zinc oxide nanoparticles. The zinc oxide nanoparticles synthesized using garlic skin are expected to have applications in biotechnology, biomedical, catalysis, coatings, sensors and water remediation. This green approach for the synthesis is a cheap, novel, eco friendly and convenient method.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"20-27"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68410806","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.014
M. Roushani, F. Mohammadi, Akram Valipour
In this study a facile approach to employ Copper nanoparticle (CuNPs) and multi-walled carbon nanotubes (MWCNT) as the nanomaterial for selective detection of asulam have been investigated. This work reports the electrocatalytic oxidation of asulam on glassy carbon electrodes (GCE) modified with multi-walled carbon nanotubes (MWCNT), ionic liquids (IL), chitosan (Chit) and copper nanoparticles (CuNPs).Using the proposed nanocomposite provides a specific platform with increased surface. The surface morphology of this modified electrode was characterized by field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometer (EDX) techniques. The electrochemical behaviors of the fabricated sensor were investigated by cyclic voltammetry (CV) and chronoamperometry modes. Under optimal conditions, the amperometric study exhibits two linear ranges of 1–11 and 11–200 μmol L-1 with a detection limit (LOD) of 0.33 nmol L-1 (at an S/N of 3) and sensitivity of 1.9 nA μmol L-1 for Asulam determination. This novel sensor was used to analyze the real sample. The sensor provides a convenient, low-cost and simple method for Asulam detection and proposes new horizons for quantitative detection of Asulam.
{"title":"Electroanalytical sensing of Asulam based on nanocomposite modified glassy carbon electrode","authors":"M. Roushani, F. Mohammadi, Akram Valipour","doi":"10.22052/JNS.2020.01.014","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.014","url":null,"abstract":"In this study a facile approach to employ Copper nanoparticle (CuNPs) and multi-walled carbon nanotubes (MWCNT) as the nanomaterial for selective detection of asulam have been investigated. This work reports the electrocatalytic oxidation of asulam on glassy carbon electrodes (GCE) modified with multi-walled carbon nanotubes (MWCNT), ionic liquids (IL), chitosan (Chit) and copper nanoparticles (CuNPs).Using the proposed nanocomposite provides a specific platform with increased surface. The surface morphology of this modified electrode was characterized by field-emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectrometer (EDX) techniques. The electrochemical behaviors of the fabricated sensor were investigated by cyclic voltammetry (CV) and chronoamperometry modes. Under optimal conditions, the amperometric study exhibits two linear ranges of 1–11 and 11–200 μmol L-1 with a detection limit (LOD) of 0.33 nmol L-1 (at an S/N of 3) and sensitivity of 1.9 nA μmol L-1 for Asulam determination. This novel sensor was used to analyze the real sample. The sensor provides a convenient, low-cost and simple method for Asulam detection and proposes new horizons for quantitative detection of Asulam.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"12 1","pages":"128-139"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411219","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.006
Hadis Tolouietabar, A. Hatamnia, R. Sahraei, E. Soheyli
In the present work, we demonstrate a facile way to study the biosynthesis of silver nanoparticles (Ag-NPs) with strong bactericidal properties using an aqueous extract of Scrophularia striata Boiss. The bio-reduction of Ag+ ions resulted in FCC cubic structures of Ag-NPs with spherical shapes of about 16 nm. As a main aim of the present work, the antibacterial activity of the bio-synthesized Ag-NPs against Gram-negative (Escherichia coli and Salmonella typhi ATCC) and Gram-positive (Staphylococcus aureus and Bacillus cereus) bacteria was evaluated by disk diffusion method and results were compared with those of ciprofloxacin antibiotic. Interestingly the antibacterial activity of as-prepared Ag-NPs against all pathogenic bacteria was considerably higher than those obtained for Ciprofloxacin, and also better than the recent reports on the bactericidal activity of bio-synthesized Ag-NPs. As a simple, cost-effective and biocompatible method, the present work proposes a facile way toward bio-synthesis of large-scale Ag-NPs with an excellent antibacterial activity which can be suitable for future biological applications.
{"title":"Biologically Green Synthesis of High-quality Silver Nanoparticles Using Scrophularia striata Boiss Plant Extract and Verifying Their Antibacterial Activities","authors":"Hadis Tolouietabar, A. Hatamnia, R. Sahraei, E. Soheyli","doi":"10.22052/JNS.2020.01.006","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.006","url":null,"abstract":"In the present work, we demonstrate a facile way to study the biosynthesis of silver nanoparticles (Ag-NPs) with strong bactericidal properties using an aqueous extract of Scrophularia striata Boiss. The bio-reduction of Ag+ ions resulted in FCC cubic structures of Ag-NPs with spherical shapes of about 16 nm. As a main aim of the present work, the antibacterial activity of the bio-synthesized Ag-NPs against Gram-negative (Escherichia coli and Salmonella typhi ATCC) and Gram-positive (Staphylococcus aureus and Bacillus cereus) bacteria was evaluated by disk diffusion method and results were compared with those of ciprofloxacin antibiotic. Interestingly the antibacterial activity of as-prepared Ag-NPs against all pathogenic bacteria was considerably higher than those obtained for Ciprofloxacin, and also better than the recent reports on the bactericidal activity of bio-synthesized Ag-NPs. As a simple, cost-effective and biocompatible method, the present work proposes a facile way toward bio-synthesis of large-scale Ag-NPs with an excellent antibacterial activity which can be suitable for future biological applications.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"44-51"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411048","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.011
S. Bagheri, M. Hashemian, M. Khosravi, A. Khandan
The application of nanoparticles in order to enhance the composites properties has been recently attracted many researchers' attentions. To increase the mechanical and physical properties of the composites, the nanoparticles have no significant effect on the weight and nanostructure of composites. One of the well-known nanoparticles is the Nanoclay (NC) that have been widely used in industries due to its unique geometric shape and some specific chemical properties. In this research, the effect of NC on the mechanical behavior of epoxy hybrid/glass fibers composite has been investigated. Samples containing (1, 2, 3, 5 and 7) wt% of NC with constant amount of epoxy hybrid /glass fibers composite were produced. Samples with 3 wt% NC has shown proper impact, tensile properties. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique were used to analysis the morphology and phase characterization of the samples. The results of tensile, bending and impact tests on hybrid samples showed improvement in these properties compared to the primary sample without nanoparticles incorporated. On the other hand, the energy absorbed by the target was increased, due to the sensitivity of the glass fiber to the strain rate. The novel hybrid epoxy/glass fibers composite reinforced with 3 wt% NC present proper mechanical properties compared to another specimen.
{"title":"An experimental investigation of novel hybrid epoxy/glass fibers nanocomposite reinforced with nanoclay with enhanced properties for low velocity impact test","authors":"S. Bagheri, M. Hashemian, M. Khosravi, A. Khandan","doi":"10.22052/JNS.2020.01.011","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.011","url":null,"abstract":"The application of nanoparticles in order to enhance the composites properties has been recently attracted many researchers' attentions. To increase the mechanical and physical properties of the composites, the nanoparticles have no significant effect on the weight and nanostructure of composites. One of the well-known nanoparticles is the Nanoclay (NC) that have been widely used in industries due to its unique geometric shape and some specific chemical properties. In this research, the effect of NC on the mechanical behavior of epoxy hybrid/glass fibers composite has been investigated. Samples containing (1, 2, 3, 5 and 7) wt% of NC with constant amount of epoxy hybrid /glass fibers composite were produced. Samples with 3 wt% NC has shown proper impact, tensile properties. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique were used to analysis the morphology and phase characterization of the samples. The results of tensile, bending and impact tests on hybrid samples showed improvement in these properties compared to the primary sample without nanoparticles incorporated. On the other hand, the energy absorbed by the target was increased, due to the sensitivity of the glass fiber to the strain rate. The novel hybrid epoxy/glass fibers composite reinforced with 3 wt% NC present proper mechanical properties compared to another specimen.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"92-106"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411081","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 : 2020-01-01DOI: 10.22052/JNS.2020.01.019
Shahab Khademi, M. Hamadanian, B. Roozbehani, N. Khademi
A high flux thin-film nanocomposite membrane epoxy/ zeolite NaA nanocomposite films prepared by using ultrasonic mixing and spin coating. The synthesized nanocomposites film was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravity analysis (TGA), and FTIR spectroscopy. Water softener and water flux characteristics of the epoxy/ zeolite NaA nanocomposite film investigated. The results show the water softener, and hydraulic permeability of the membranes, remarkably improve by the wt.% of the zeolite NaA loading. Antibacterial activity was investigated by use modification of zeolite NaA with silver ions (Ag+) and copper ions (Cu2+) for nanocomposite.The target of this work was to expand the thin high-performance nanocomposite membranes with the combination of the zeolite NaA and epoxy polymer for effective calcium removal from water also to improve the water permeability at the same time. NaA zeolite ion exchange with silver and copper were used to improve the anti-bacterial nanocomposite membrane.
{"title":"Synthesis and characterization of high flux and antibacterial film nanocomposite based on epoxy-zeolite NaA","authors":"Shahab Khademi, M. Hamadanian, B. Roozbehani, N. Khademi","doi":"10.22052/JNS.2020.01.019","DOIUrl":"https://doi.org/10.22052/JNS.2020.01.019","url":null,"abstract":"A high flux thin-film nanocomposite membrane epoxy/ zeolite NaA nanocomposite films prepared by using ultrasonic mixing and spin coating. The synthesized nanocomposites film was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravity analysis (TGA), and FTIR spectroscopy. Water softener and water flux characteristics of the epoxy/ zeolite NaA nanocomposite film investigated. The results show the water softener, and hydraulic permeability of the membranes, remarkably improve by the wt.% of the zeolite NaA loading. Antibacterial activity was investigated by use modification of zeolite NaA with silver ions (Ag+) and copper ions (Cu2+) for nanocomposite.The target of this work was to expand the thin high-performance nanocomposite membranes with the combination of the zeolite NaA and epoxy polymer for effective calcium removal from water also to improve the water permeability at the same time. NaA zeolite ion exchange with silver and copper were used to improve the anti-bacterial nanocomposite membrane.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"177-184"},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411190","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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