Pub Date : 2021-04-01DOI: 10.26655/AJNANOMAT.2021.2.5
P. Ghosh, S. Yeasmin
Ionic liquids (ILs) have come out as a promising lubricant additive in base oil during the past few years due to their low volatility, non–flammability, thermal stability, moisture stability and miscibility with organic compounds. In the present work, an investigation was carried out to determine whether the flow improvement property and shear stability of a polymeric additive can be affected when blended with an ionic liquid. We prepared a copolymer of vinyl acetate and octyl acrylate and blended it with imidazolium–based IL. Their performance as pour point depressant (PPD), viscosity index improver (VII) and also their stability against the mechanical shear in terms of permanent shear stability index (PSSI) were determined when added to the base oil as solo additive or as blend. The results revealed that the blend outweighs the polymer and the IL in all respect as a lubricant additive. As PPD, the best result was obtained in case of the blend at 4% concentration in both the base oils i.e. –12.1 °C and –13.7 °C in BO1 and BO2 respectively. Kinematic viscosity loss was least when the base oils were doped with the blend. This was supported by the PSSI data: 24.22 at 1% concentration in BO1 and 11.82 at 3% concentration in BO2.
{"title":"Synergistic effect of ionic liquid on additive performance of octyl acrylate-vinyl acetate copolymer and their comparison when added to lube oil","authors":"P. Ghosh, S. Yeasmin","doi":"10.26655/AJNANOMAT.2021.2.5","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2021.2.5","url":null,"abstract":"Ionic liquids (ILs) have come out as a promising lubricant additive in base oil during the past few years due to their low volatility, non–flammability, thermal stability, moisture stability and miscibility with organic compounds. In the present work, an investigation was carried out to determine whether the flow improvement property and shear stability of a polymeric additive can be affected when blended with an ionic liquid. We prepared a copolymer of vinyl acetate and octyl acrylate and blended it with imidazolium–based IL. Their performance as pour point depressant (PPD), viscosity index improver (VII) and also their stability against the mechanical shear in terms of permanent shear stability index (PSSI) were determined when added to the base oil as solo additive or as blend. The results revealed that the blend outweighs the polymer and the IL in all respect as a lubricant additive. As PPD, the best result was obtained in case of the blend at 4% concentration in both the base oils i.e. –12.1 °C and –13.7 °C in BO1 and BO2 respectively. Kinematic viscosity loss was least when the base oils were doped with the blend. This was supported by the PSSI data: 24.22 at 1% concentration in BO1 and 11.82 at 3% concentration in BO2.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82805145","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 : 2020-06-01DOI: 10.26655/AJNANOMAT.2020.3.3
I. Ikhioya, D. Okoli, Azibuike J. Ekpunobic
In this research study, the growth of SnZnSe thin film materials was carried out using the cationic precursor, which was an aqueous solution of 0.035 mol solution of ZnSO4.7H2O while the anionic precursor was 0.1 mol solution of selenium metal powder was prepared by dissolving with 4 mL of hydrogen chloride (HCl). The XRD of the films deposited on FTO substrates at different dopant concentration 1%, 2%, 3% and 4% showed the reflection peaks at (220), (221), (300), (310), (311), (222) and (320) with the lattice constant of a=7.189 Ǻ. The SEM results revealed the random distribution of tiny nano-grains on the substrate, the nano-grains were observed to agglomerate due to the presence of large free energy characteristics of small particles. The optical bandgap of the deposited material enhanced from 2.0-2.3 eV as the dopant concentration increased.
{"title":"Electrochemical deposition of tin doped zinc selenide (SnZnSe) thin film material","authors":"I. Ikhioya, D. Okoli, Azibuike J. Ekpunobic","doi":"10.26655/AJNANOMAT.2020.3.3","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2020.3.3","url":null,"abstract":"In this research study, the growth of SnZnSe thin film materials was carried out using the cationic precursor, which was an aqueous solution of 0.035 mol solution of ZnSO4.7H2O while the anionic precursor was 0.1 mol solution of selenium metal powder was prepared by dissolving with 4 mL of hydrogen chloride (HCl). The XRD of the films deposited on FTO substrates at different dopant concentration 1%, 2%, 3% and 4% showed the reflection peaks at (220), (221), (300), (310), (311), (222) and (320) with the lattice constant of a=7.189 Ǻ. The SEM results revealed the random distribution of tiny nano-grains on the substrate, the nano-grains were observed to agglomerate due to the presence of large free energy characteristics of small particles. The optical bandgap of the deposited material enhanced from 2.0-2.3 eV as the dopant concentration increased.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"383 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76527208","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 : 2020-06-01DOI: 10.26655/ajnanomat.2020.4.5
Farzaneh Mehri-Talarposhti, A. G. Saraei, L. Golestan, S. Shahidi
In this study, MgO/CNTs nanocomposite was synthesized using a simple approach according to the hydrogen bonding between the oxygen atom in MgO and hydrogen atom in SWCNTs-COOH. The nanocomposite was characterized using the FESEM and EDS methods. The MgO/CNTs nanocomposite was used for amplification of the paste electrode (PE) at the presence of 1-methyl-3-buthyl imizazolonium tetrafluoroborate (MBITF) as the binder. The MgO/CNTs/MBITF/PE was used as an electroanalytical tool for electro-oxidation determination of vitamin B6 in food samples. In comparison to PE, the oxidation signal of vitamin B6 was improved up to 3.2 times at the surface of MgO/CNTs/MBITF/PE. At pH=6 as optimum condition, the MgO/CNTs/MBITF/PE revealed linear dynamic range of 0.1-400 µM for determination of vitamin B6 with the detection limit of 30.0 nM. In the final step, the MgO/CNTs/MBITF/PE showed acceptable recovery data for the determination of vitamin B6 in fruit juices samples, confirming the ability of the sensors in real sample analysis.
{"title":"Electrochemical determination of Vitamin B6 in fruit juices using a new nanostructure voltammetric sensor","authors":"Farzaneh Mehri-Talarposhti, A. G. Saraei, L. Golestan, S. Shahidi","doi":"10.26655/ajnanomat.2020.4.5","DOIUrl":"https://doi.org/10.26655/ajnanomat.2020.4.5","url":null,"abstract":"In this study, MgO/CNTs nanocomposite was synthesized using a simple approach according to the hydrogen bonding between the oxygen atom in MgO and hydrogen atom in SWCNTs-COOH. The nanocomposite was characterized using the FESEM and EDS methods. The MgO/CNTs nanocomposite was used for amplification of the paste electrode (PE) at the presence of 1-methyl-3-buthyl imizazolonium tetrafluoroborate (MBITF) as the binder. The MgO/CNTs/MBITF/PE was used as an electroanalytical tool for electro-oxidation determination of vitamin B6 in food samples. In comparison to PE, the oxidation signal of vitamin B6 was improved up to 3.2 times at the surface of MgO/CNTs/MBITF/PE. At pH=6 as optimum condition, the MgO/CNTs/MBITF/PE revealed linear dynamic range of 0.1-400 µM for determination of vitamin B6 with the detection limit of 30.0 nM. In the final step, the MgO/CNTs/MBITF/PE showed acceptable recovery data for the determination of vitamin B6 in fruit juices samples, confirming the ability of the sensors in real sample analysis.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74468892","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 : 2020-06-01DOI: 10.26655/AJNANOMAT.2020.3.2
I. Happiness, R. Wuana, N. Lami, S. Rufus
This study used chitosan as a capping agent and L-ascorbic acid as reducing agent to prepare copper nanoparticles encapsulated with 2,4-D dimethylamine herbicide via a green chemical reduction method to improve its herbicidal activity and reduce the negative environmental impacts associated with its application. Characterization of the synthesized CuCtsNPs and 2,4-D-CuCtsNPs was carried out using the following techniques; transmission electron microscopy (TEM), fourier transform- infra-red (FT-IR), scanning electron microscopy (SEM), energy-dispersive x-ray (EDX), powder x-ray diffraction (PXRD), differential scanning calorimeter (DSC), thermogravimetric and differential thermal analysis (TGA/DTA). The maximum absorption peak of CuCtsNPs was observed around 560 nm while that of 2,4-D-CuCtsNPs at 558 nm. The yield of CuCtsNPs was at the range of 40-92% and encapsulation efficiency of the 2,4-D-CuCtsNPs formulationwas 93%. Debye- Scherer’s equation was used to calculate the average crystalline size of the synthesized CuCtsNPs and 2,4-D-CuCtsNPs. The values were 38.78 nm (CuCtsNPs) and 54.93 nm (2,4-D-CuCtsNPs) respectively. The SEM images revealed the particle size of 21-56 nm for CuCtsNPs and 25-69 nm for 2,4-D-CuCtsNPs. The results obtained from the DSC and TGA curves of CuCtsNPs and 2,4-D-CuCtsNPs showed that the formulations exist in crystalline state and were thermally stable up to 401.73 °C. Aqueous release studies for the formulation were carried out in three different pH media and two agricultural soils. Leaching profile of the loaded CuCtsNPs through the soil layer (UAM and CAPS) demonstrated that the UAM soil had higher value for 2,4-D (58.67%) than in CAPS soil 40.78%. This study formulated an environmentally friendly herbicide delivery nano-matrix (CuCtsNPs) for the successful slow release of 2,4-D Dimethylamine herbicide in aqueous medium and agricultural soils.
本研究以壳聚糖为封盖剂，l -抗坏血酸为还原剂，通过绿色化学还原法制备了包裹2,4- d二甲胺除草剂的铜纳米颗粒，以提高其除草活性，减少其使用对环境的负面影响。利用以下技术对合成的CuCtsNPs和2,4- d -CuCtsNPs进行表征;透射电子显微镜(TEM)、傅里叶变换-红外(FT-IR)、扫描电子显微镜(SEM)、能量色散x射线(EDX)、粉末x射线衍射(PXRD)、差示扫描量热计(DSC)、热重和差示热分析(TGA/DTA)。CuCtsNPs的最大吸收峰在560 nm左右，2,4- d -CuCtsNPs的最大吸收峰在558 nm左右。CuCtsNPs的产率为40 ~ 92%，2,4- d -CuCtsNPs的包封率为93%。采用Debye- Scherer方程计算合成的CuCtsNPs和2,4- d -CuCtsNPs的平均晶粒尺寸。分别为38.78 nm (CuCtsNPs)和54.93 nm (2,4- d -CuCtsNPs)。扫描电镜显示，CuCtsNPs的粒径为21 ~ 56 nm, 2,4- d -CuCtsNPs的粒径为25 ~ 69 nm。对CuCtsNPs和2,4- d -CuCtsNPs的DSC和TGA曲线分析结果表明，该配方以结晶形式存在，在401.73℃内热稳定。在三种不同pH介质和两种农业土壤中进行了该制剂的水释放研究。负载CuCtsNPs通过土层(UAM和CAPS)的淋溶曲线表明，UAM土壤的2,4- d值(58.67%)高于CAPS土壤的40.78%。本研究制备了一种环境友好型除草剂缓释纳米基质(CuCtsNPs)，用于2,4- d二甲胺除草剂在水介质和农业土壤中的缓释。
{"title":"Eco-friendly 2,4-D dimethylamine herbicide delivery system using synthesized nano-matrix","authors":"I. Happiness, R. Wuana, N. Lami, S. Rufus","doi":"10.26655/AJNANOMAT.2020.3.2","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2020.3.2","url":null,"abstract":"This study used chitosan as a capping agent and L-ascorbic acid as reducing agent to prepare copper nanoparticles encapsulated with 2,4-D dimethylamine herbicide via a green chemical reduction method to improve its herbicidal activity and reduce the negative environmental impacts associated with its application. Characterization of the synthesized CuCtsNPs and 2,4-D-CuCtsNPs was carried out using the following techniques; transmission electron microscopy (TEM), fourier transform- infra-red (FT-IR), scanning electron microscopy (SEM), energy-dispersive x-ray (EDX), powder x-ray diffraction (PXRD), differential scanning calorimeter (DSC), thermogravimetric and differential thermal analysis (TGA/DTA). The maximum absorption peak of CuCtsNPs was observed around 560 nm while that of 2,4-D-CuCtsNPs at 558 nm. The yield of CuCtsNPs was at the range of 40-92% and encapsulation efficiency of the 2,4-D-CuCtsNPs formulationwas 93%. Debye- Scherer’s equation was used to calculate the average crystalline size of the synthesized CuCtsNPs and 2,4-D-CuCtsNPs. The values were 38.78 nm (CuCtsNPs) and 54.93 nm (2,4-D-CuCtsNPs) respectively. The SEM images revealed the particle size of 21-56 nm for CuCtsNPs and 25-69 nm for 2,4-D-CuCtsNPs. The results obtained from the DSC and TGA curves of CuCtsNPs and 2,4-D-CuCtsNPs showed that the formulations exist in crystalline state and were thermally stable up to 401.73 °C. Aqueous release studies for the formulation were carried out in three different pH media and two agricultural soils. Leaching profile of the loaded CuCtsNPs through the soil layer (UAM and CAPS) demonstrated that the UAM soil had higher value for 2,4-D (58.67%) than in CAPS soil 40.78%. This study formulated an environmentally friendly herbicide delivery nano-matrix (CuCtsNPs) for the successful slow release of 2,4-D Dimethylamine herbicide in aqueous medium and agricultural soils.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73148612","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 : 2020-06-01DOI: 10.26655/ajnanomat.2020.3.7
Fatemeh Majidi Arlan, Ramin Javahershenas, J. Khalafy
In this research study, one-pot, four-component reaction of 3-aryl-3-oxopropanenitriles, 1-aryl-3-methyl-1H-pyrazol-5 (4H) one, arylglyoxals and ammonium acetate using green solvent systems and different catalysts under the reflux conditions afforded a series of the corresponding 4-aroyl-3-methyl-1,6-diaryl-1H-pyrazolo [3,4-b] pyridine-5-carbonitrile derivatives. The best yields (70-85%) were obtained using the metal oxide silica based-matal bifunctional LDH (layered double hydroxide) as a magnet nanocatalyst in EtOH/H2O (1:1) under the reflux conditions. This protocol provided mild reaction conditions, good yields, simple workup procedure, easy preparation of nanocatalyst and, products to structurally diverse bicyclic pyrazolo [3,4-b] pyridines, demonstrating biological and pharmacological activities.
{"title":"An efficient one-pot, four-component synthesis of a series of pyrazolo [3,4-b] pyridines in the presence of magnetic LDH as a nanocatalyst","authors":"Fatemeh Majidi Arlan, Ramin Javahershenas, J. Khalafy","doi":"10.26655/ajnanomat.2020.3.7","DOIUrl":"https://doi.org/10.26655/ajnanomat.2020.3.7","url":null,"abstract":"In this research study, one-pot, four-component reaction of 3-aryl-3-oxopropanenitriles, 1-aryl-3-methyl-1H-pyrazol-5 (4H) one, arylglyoxals and ammonium acetate using green solvent systems and different catalysts under the reflux conditions afforded a series of the corresponding 4-aroyl-3-methyl-1,6-diaryl-1H-pyrazolo [3,4-b] pyridine-5-carbonitrile derivatives. The best yields (70-85%) were obtained using the metal oxide silica based-matal bifunctional LDH (layered double hydroxide) as a magnet nanocatalyst in EtOH/H2O (1:1) under the reflux conditions. This protocol provided mild reaction conditions, good yields, simple workup procedure, easy preparation of nanocatalyst and, products to structurally diverse bicyclic pyrazolo [3,4-b] pyridines, demonstrating biological and pharmacological activities.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82100551","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: 10.26655/AJNANOMAT.2020.1.4
R. Radhakrishnan, D. Lakshmi, F. Khan, Gopalakrishnan Ramalingam, K. Kaviyarasu, K. Kaviyarasu
In this work reports the synthesis of iron oxide along with the complex formation from the neem cake using the biosynthesis and precipitation method. Ferrous sulphate (FeSO4) and sodium hydroxide were used as the precursor precipitating agent, respectively. The resultant specimens were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), ultra-violet visible spectroscopy (UV-Vis), fourier-transform infrared spectroscopy (FT-IR), soil test, biochemical, and phytochemical analysis. To test the effect of the synthesized specimen as the nanofertilizer in the seed germination and the growth, the sample was incorporated in to the red soil and the agronomical traits including plant height. Number of leaves were studied over a survival period of 75 days of the selected plant species vigna mungo using POT analysis. The plant samples were harvested, and then the biochemical and phytochemical studies were carried out for alkaloids, glycosides, flavonoids, phenols, steroids, protein and total chlorophyll content. The results showed that the nanoparticles incorporation enhanced the plant growth and increased the concentration of the bioactive compounds in an appreciable level.
{"title":"Bio-synthesis of iron oxide nanoparticles using neem leaf cake extract and its influence in the agronomical traits of vigna mungo plant","authors":"R. Radhakrishnan, D. Lakshmi, F. Khan, Gopalakrishnan Ramalingam, K. Kaviyarasu, K. Kaviyarasu","doi":"10.26655/AJNANOMAT.2020.1.4","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2020.1.4","url":null,"abstract":"In this work reports the synthesis of iron oxide along with the complex formation from the neem cake using the biosynthesis and precipitation method. Ferrous sulphate (FeSO4) and sodium hydroxide were used as the precursor precipitating agent, respectively. The resultant specimens were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), ultra-violet visible spectroscopy (UV-Vis), fourier-transform infrared spectroscopy (FT-IR), soil test, biochemical, and phytochemical analysis. To test the effect of the synthesized specimen as the nanofertilizer in the seed germination and the growth, the sample was incorporated in to the red soil and the agronomical traits including plant height. Number of leaves were studied over a survival period of 75 days of the selected plant species vigna mungo using POT analysis. The plant samples were harvested, and then the biochemical and phytochemical studies were carried out for alkaloids, glycosides, flavonoids, phenols, steroids, protein and total chlorophyll content. The results showed that the nanoparticles incorporation enhanced the plant growth and increased the concentration of the bioactive compounds in an appreciable level.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81487968","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}
TiO2 nanoparticles were synthesized using a simple reaction of TiCl4 with different types of primary and secondary alcohols. Four different alcohols (ethanol, isopropyl, isobutyl, and isobentyl alcohol) were investigated. The experiments were carried out to compare the products of the reactions with different precursors. The gelatine products were calcined at 400 °C and at 1000 °C in a box furnace and the effect of calcination temperature on the feature of nano-particles was studied. The synthesized TiO2 nanoparticles were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results revealed that the average particle size was 8.9-18.4 nm. The antibacterial result of titanium dioxide nanoparticles at four types of bacteria was two gram-positive (Staphylococcus aureus and Streptococcus sp.) and two gram-negative (Escherichia coli and Klebsiella sp.). Also, nanoparticles titanium dioxide did not have any effect on these types of bacteria. The sol-gel method could be used for applications that involve nano-crystalline TiO2 with anatase phase with low cost and simple preparation.
{"title":"Comparative investigations of synthesis TiO2 Nano-Particles from four different types of alcohols by Sol-Gel method and evaluation of their antibacterial activity","authors":"Mariam Farag Ambaraka, Fawzia Muftah Aljazwia, Randa Fawzi Alsupikhe","doi":"10.26655/ajnanomat.2019.4.7","DOIUrl":"https://doi.org/10.26655/ajnanomat.2019.4.7","url":null,"abstract":"TiO2 nanoparticles were synthesized using a simple reaction of TiCl4 with different types of primary and secondary alcohols. Four different alcohols (ethanol, isopropyl, isobutyl, and isobentyl alcohol) were investigated. The experiments were carried out to compare the products of the reactions with different precursors. The gelatine products were calcined at 400 °C and at 1000 °C in a box furnace and the effect of calcination temperature on the feature of nano-particles was studied. The synthesized TiO2 nanoparticles were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results revealed that the average particle size was 8.9-18.4 nm. The antibacterial result of titanium dioxide nanoparticles at four types of bacteria was two gram-positive (Staphylococcus aureus and Streptococcus sp.) and two gram-negative (Escherichia coli and Klebsiella sp.). Also, nanoparticles titanium dioxide did not have any effect on these types of bacteria. The sol-gel method could be used for applications that involve nano-crystalline TiO2 with anatase phase with low cost and simple preparation.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77104893","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 : 2019-09-01DOI: 10.26655/ajnanomat.2019.4.6
Shah Rukh, A. H. Sofi, M. A. Shah, S. Yousuf
In this research study, the magnesium oxide nanoparticles were synthesized using an inexpensive and simple hydrothermal method. A pure magnesium metal powder, de-ionized water, and hydrogen peroxide (H2O2) was utilized as the starting materials. The synthesized MgO was dense, uniformly distributed with a relatively spherical shape, without any cracks and voids as confirmed by the scaning electron microscopy (SEM) analysis. The structure was crystalline with a high purity. No other peak corresponding to any other material or metal could be ascertained from powder X-ray diffraction (XRD) pattern. The crystallite size of the prepared samples was found to be nearly 18 nm which was favorable for antibacterial activity. The antibacterial activity of MgO nanostructures was carried out by using disc diffusion method. The inhibition zones of diameters = 1 mm were observed in case of salmonella and Staphylococcus aureus, however, in case of E. Coli inhibition zones of diameter = 2 mm was obtained.
{"title":"Antibacterial activity of magnesium oxide nanostructures prepared by hydrothermal method","authors":"Shah Rukh, A. H. Sofi, M. A. Shah, S. Yousuf","doi":"10.26655/ajnanomat.2019.4.6","DOIUrl":"https://doi.org/10.26655/ajnanomat.2019.4.6","url":null,"abstract":"In this research study, the magnesium oxide nanoparticles were synthesized using an inexpensive and simple hydrothermal method. A pure magnesium metal powder, de-ionized water, and hydrogen peroxide (H2O2) was utilized as the starting materials. The synthesized MgO was dense, uniformly distributed with a relatively spherical shape, without any cracks and voids as confirmed by the scaning electron microscopy (SEM) analysis. The structure was crystalline with a high purity. No other peak corresponding to any other material or metal could be ascertained from powder X-ray diffraction (XRD) pattern. The crystallite size of the prepared samples was found to be nearly 18 nm which was favorable for antibacterial activity. The antibacterial activity of MgO nanostructures was carried out by using disc diffusion method. The inhibition zones of diameters = 1 mm were observed in case of salmonella and Staphylococcus aureus, however, in case of E. Coli inhibition zones of diameter = 2 mm was obtained.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"145 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83079296","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 : 2019-09-01DOI: 10.26655/AJNANOMAT.2019.4.8
Nuruzzaman Sarker, A. Kumer, Mohammad Jahidul Islam, Sunanda Paul
Cannabicyclol, also called CBL, is one of the least known and studied isomer of cannabinoids in the cannabis plant, and it is the precursor of the different cannabinoids found in marijuana plant having with widespread medicinal use. In this work, the thermophysical properties of CBL such as, free energy, entropy, dipole moment, binding energy, nuclear energy, electronics energy, and heat of formation were estimated using density functional theory for developing use as pharmaceutical pursues. In addition, the chemical reactivity properties including highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), HOMO-LUMO gap, ionization potential, electronegativity, hardness, softness, and electron affinity were evaluated. It was found that, the magnitude of HOMO was -8.98 and -8.53, LUMO was 0.19, -0.31 and HOMO –LUMO gap was -9.17 and -8.22 eV of CBL and CBG, respectively. The vibrational spectrum and electronics spectrum were simulated for identification and characterization. These studies provided a proper and predictable data for further use in any chemical and pharmaceutical purpose.
{"title":"A computational study of thermophysical, HOMO, LUMO, vibrational spectrum and UV-visible spectrum of cannabicyclol (CBL), and cannabigerol (CBG) using DFT","authors":"Nuruzzaman Sarker, A. Kumer, Mohammad Jahidul Islam, Sunanda Paul","doi":"10.26655/AJNANOMAT.2019.4.8","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2019.4.8","url":null,"abstract":"Cannabicyclol, also called CBL, is one of the least known and studied isomer of cannabinoids in the cannabis plant, and it is the precursor of the different cannabinoids found in marijuana plant having with widespread medicinal use. In this work, the thermophysical properties of CBL such as, free energy, entropy, dipole moment, binding energy, nuclear energy, electronics energy, and heat of formation were estimated using density functional theory for developing use as pharmaceutical pursues. In addition, the chemical reactivity properties including highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), HOMO-LUMO gap, ionization potential, electronegativity, hardness, softness, and electron affinity were evaluated. It was found that, the magnitude of HOMO was -8.98 and -8.53, LUMO was 0.19, -0.31 and HOMO –LUMO gap was -9.17 and -8.22 eV of CBL and CBG, respectively. The vibrational spectrum and electronics spectrum were simulated for identification and characterization. These studies provided a proper and predictable data for further use in any chemical and pharmaceutical purpose.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90192888","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 : 2019-07-01DOI: 10.26655/AJNANOMAT.2019.2.3.4
S. Said, M. Riad, S. Mikhail
Birnessite and manganite materials were prepared using a simple precipitation process in an alkaline medium. Potassium hydroxide and tetraethyl ammonium hydroxide (TEAH) used as the precipitating agents. Different techniques such as XRD, DSC, TGA, FT-IR, TEM and N2 adsorption analyses were employed to characterize the prepared samples. The results revealed that the formed phase in the prepared sample is dependent on the concentration of the precipitating agent. In addition, the XRD results showed the formation of various phases through controlling the concentration of the precipitating agent. Pure phase of birnessite produced in the high alkaline medium, and manganite (γ-MnOOH) at relatively low alkalinity. The samples prepared by using TEAH were well crystalline compared with the analogue one prepared by KOH. The obtained results elaborated the role of TEAH in directing the order of the particles during the preparation step.
{"title":"Preparation of different manganese oxide structures via controlling the concentration and the type of the alkaline media","authors":"S. Said, M. Riad, S. Mikhail","doi":"10.26655/AJNANOMAT.2019.2.3.4","DOIUrl":"https://doi.org/10.26655/AJNANOMAT.2019.2.3.4","url":null,"abstract":"Birnessite and manganite materials were prepared using a simple precipitation process in an alkaline medium. Potassium hydroxide and tetraethyl ammonium hydroxide (TEAH) used as the precipitating agents. Different techniques such as XRD, DSC, TGA, FT-IR, TEM and N2 adsorption analyses were employed to characterize the prepared samples. The results revealed that the formed phase in the prepared sample is dependent on the concentration of the precipitating agent. In addition, the XRD results showed the formation of various phases through controlling the concentration of the precipitating agent. Pure phase of birnessite produced in the high alkaline medium, and manganite (γ-MnOOH) at relatively low alkalinity. The samples prepared by using TEAH were well crystalline compared with the analogue one prepared by KOH. The obtained results elaborated the role of TEAH in directing the order of the particles during the preparation step.","PeriodicalId":8523,"journal":{"name":"Asian Journal of Nanoscience and Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81558911","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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