Pub Date : 2020-04-01DOI: 10.22052/JNS.2020.02.010
Pourya Mehdizadeh, Z. Tavangar, N. Shabani, M. Hamadanian
In order to improve photocatalytic activities of the pure anatase TiO2 under UV and visible light irradiations, a novel and efficient N-doped TiO2 photocatalyst was prepared by sol-gel method. N-doped titania is prepared using the various nitrogen sources such as: triethylamine, N,N,N’,N’-tetramethylethane-1,2-diamine, ethyldiamine, 1,2-phenylenediamine, propanolamine, and propylenediamine and then the effect of these source on properties of products was investigated. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), energy dispersive spectrometry (EDS) and Fourier transform infrared (FT-IR) techniques. Results indicate that the shifting of absorption edge to visible region compare to the pure TiO2, reducing average size of the TiO2 crystallites, enhancing of lattice distortion of Ti, effective separation of photo-induced electron and hole pair, and improvement of pollutant decomposition under UV and visible light irradiations are due to doping of N in titania. The photocatalytic activities of N-doped TiO2 nanoparticles were evaluated using the photodegradation of methyl orange (MO) under the irradiation of UV and visible light and it confirmed that the photocatalytic activity of N-TiO2 is better than the pure TiO2. By comparing the photocatalytic activities of the N-TiO2 with different nitrogen sources, triethylamine with 2 molar ratio was chosen as the optimum.
{"title":"Visible Light Activity of Nitrogen-Doped TiO2 by Sol-Gel Method Using Various Nitrogen Sources","authors":"Pourya Mehdizadeh, Z. Tavangar, N. Shabani, M. Hamadanian","doi":"10.22052/JNS.2020.02.010","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.010","url":null,"abstract":"In order to improve photocatalytic activities of the pure anatase TiO2 under UV and visible light irradiations, a novel and efficient N-doped TiO2 photocatalyst was prepared by sol-gel method. N-doped titania is prepared using the various nitrogen sources such as: triethylamine, N,N,N’,N’-tetramethylethane-1,2-diamine, ethyldiamine, 1,2-phenylenediamine, propanolamine, and propylenediamine and then the effect of these source on properties of products was investigated. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), energy dispersive spectrometry (EDS) and Fourier transform infrared (FT-IR) techniques. Results indicate that the shifting of absorption edge to visible region compare to the pure TiO2, reducing average size of the TiO2 crystallites, enhancing of lattice distortion of Ti, effective separation of photo-induced electron and hole pair, and improvement of pollutant decomposition under UV and visible light irradiations are due to doping of N in titania. The photocatalytic activities of N-doped TiO2 nanoparticles were evaluated using the photodegradation of methyl orange (MO) under the irradiation of UV and visible light and it confirmed that the photocatalytic activity of N-TiO2 is better than the pure TiO2. By comparing the photocatalytic activities of the N-TiO2 with different nitrogen sources, triethylamine with 2 molar ratio was chosen as the optimum.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"307-316"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41711050","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.011
Mohammad Karbalaei, D. Dideban, N. Moezi, H. Heidari
In this work, a novel Silicon on Insulator (SOI) MOSFET is proposed and investigated. The drain and source electrode structures are optimized to enhance ON-current while global device temperature and hot carrier injection are decreased. In addition, to create an effective heat passage from channel to outside of the device, a silicon region has embedded in the buried oxide. In order to reduce the device leakage current and controlling the threshold voltage, a p-type retrograde doping is introduced into channel region. Since the air has the least permittivity among materials, it can be utilized to decrease the device parasitic capacitances. Based on this, an air gap is embedded in the buried oxide near the silicon to improve RF performance of the device. Because the source and drain electrodes are embedded in and over the silicon film in the source and drain regions, we called this structure EEIOS-SOI MOSFET. “EEIOS” stands for “Embedded Electrodes In and Over the Silicon film”. During this work, EEIOS-SOI MOSFET is compared with a conventional SOI MOSFET and another SOI MOSFET with just Embedded Electrodes In the Silicon Film (EEIS-SOI). EEIS-SOI presents better electrical figure of merits including lower subthreshold slope and lower leakage current in simulations. An immense investigation among these devices shows that EEIOS-SOI MOSFET has better transconductance, lower gate injection leakage current and lower temperature related to DC parameters and higher cut off frequency, gain bandwidth product and unilateral power gain related to AC figures of merits compared to its counterparts.
{"title":"Improvement of a Nano-scale Silicon on Insulator Field Effect Transistor Performance using Electrode, Doping and Buried Oxide Engineering","authors":"Mohammad Karbalaei, D. Dideban, N. Moezi, H. Heidari","doi":"10.22052/JNS.2020.02.011","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.011","url":null,"abstract":"In this work, a novel Silicon on Insulator (SOI) MOSFET is proposed and investigated. The drain and source electrode structures are optimized to enhance ON-current while global device temperature and hot carrier injection are decreased. In addition, to create an effective heat passage from channel to outside of the device, a silicon region has embedded in the buried oxide. In order to reduce the device leakage current and controlling the threshold voltage, a p-type retrograde doping is introduced into channel region. Since the air has the least permittivity among materials, it can be utilized to decrease the device parasitic capacitances. Based on this, an air gap is embedded in the buried oxide near the silicon to improve RF performance of the device. Because the source and drain electrodes are embedded in and over the silicon film in the source and drain regions, we called this structure EEIOS-SOI MOSFET. “EEIOS” stands for “Embedded Electrodes In and Over the Silicon film”. During this work, EEIOS-SOI MOSFET is compared with a conventional SOI MOSFET and another SOI MOSFET with just Embedded Electrodes In the Silicon Film (EEIS-SOI). EEIS-SOI presents better electrical figure of merits including lower subthreshold slope and lower leakage current in simulations. An immense investigation among these devices shows that EEIOS-SOI MOSFET has better transconductance, lower gate injection leakage current and lower temperature related to DC parameters and higher cut off frequency, gain bandwidth product and unilateral power gain related to AC figures of merits compared to its counterparts.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"317-326"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47978556","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.018
R. Rahimi, M. Rabbani, H. Khosravi, A. Maleki
The mesoporous ZrFe2O4 nanocauliflowers were synthesized via the solvothermal method. The core-shell ZrFe2O4@SiO2 nanocomposite was successfully prepared by a simple wet route using tetraethylorthosilicate, then modified with (3-aminopropyl)triethoxisilan (APTES) as linker and tetrakis(4-carboxyphenyl)porphyrin (TCPP) as agent for light harvesting, to fabricate ZrFe2O4@SiO2-NH-TCPP nanocomposite. The characterizations of samples were done by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), nitrogen adsorption and desorption isotherms (BET), vibrating sample magnetometer (VSM), diffuse reflectance spectroscopy (DRS) and fluorescence spectroscopy. The prepared samples were applied as photocatalyst to remove of methyl orange (MO) under visible LED light irradiation. The obtained results showed that the presence of SiO2 and TCPP decreased the size of particles and improve the photocatalytic activity of samples, too, led to increase of photodegradation of MO. The final fabricated nanocomposite (ZrFe2O4@SiO2-NH-TCPP) could degrade MO about 100% under only 10 W visible LED irradiation and be separated easily by an external magnetic field.
{"title":"Synthesize and Characterization of Mesoporous ZrFe2O4@SiO₂ Core-shell Nanocomposite Modified with APTES and TCPP","authors":"R. Rahimi, M. Rabbani, H. Khosravi, A. Maleki","doi":"10.22052/JNS.2020.02.018","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.018","url":null,"abstract":"The mesoporous ZrFe2O4 nanocauliflowers were synthesized via the solvothermal method. The core-shell ZrFe2O4@SiO2 nanocomposite was successfully prepared by a simple wet route using tetraethylorthosilicate, then modified with (3-aminopropyl)triethoxisilan (APTES) as linker and tetrakis(4-carboxyphenyl)porphyrin (TCPP) as agent for light harvesting, to fabricate ZrFe2O4@SiO2-NH-TCPP nanocomposite. The characterizations of samples were done by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), nitrogen adsorption and desorption isotherms (BET), vibrating sample magnetometer (VSM), diffuse reflectance spectroscopy (DRS) and fluorescence spectroscopy. The prepared samples were applied as photocatalyst to remove of methyl orange (MO) under visible LED light irradiation. The obtained results showed that the presence of SiO2 and TCPP decreased the size of particles and improve the photocatalytic activity of samples, too, led to increase of photodegradation of MO. The final fabricated nanocomposite (ZrFe2O4@SiO2-NH-TCPP) could degrade MO about 100% under only 10 W visible LED irradiation and be separated easily by an external magnetic field.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"404-414"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46012205","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.004
R. Emamian, M. Ebrahimi, H. Karimi-Maleh
5-fluorouracil is a widely used anticancer drug with many side effects on humans, and hence its analysis in biological samples is very important. Accordingly, a novel sensitive electrochemical approach was fabricated by incorporating graphene quantum dots (GCD) and 1-butylpyridinium bromide (BPBr) in the formulation of a carbon paste electrode (GQD/BPBr/CPE). The GQD was synthesized and characterized TEM method and results confirmed them as being spherical with D~ of 5.0 nm. The applicability of the GQD/BPBr/CPE in voltammetric analysis of 5-fluorouracil was evaluated. The relations of oxidation currents and potentials of 5-fluorouracil with pH at the surface of GQD/BPBr/CPE were investigated and the results confirmed the involvement of electrons and protons in the electro-oxidation mechanism of 5-fluorouracil. In square wave voltammetry (SWV) analyses, the GQD/BPBr/CPE showed good sensitivity for 5-fluorouracil over a wide linear range of 0.001–400 μΜ and a detection limit of 0.5 nΜ was achieved. The GQD/BPBr/CPE was successfully applied for the determination of 5-fluorouracil in pharmaceutical samples and acceptable results were obtained.
{"title":"A Sensitive Sensor for Nano-Molar Detection of 5-Fluorouracil by Modifying a Paste Sensor with Graphene Quantum Dots and an Ionic Liquid","authors":"R. Emamian, M. Ebrahimi, H. Karimi-Maleh","doi":"10.22052/JNS.2020.02.004","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.004","url":null,"abstract":"5-fluorouracil is a widely used anticancer drug with many side effects on humans, and hence its analysis in biological samples is very important. Accordingly, a novel sensitive electrochemical approach was fabricated by incorporating graphene quantum dots (GCD) and 1-butylpyridinium bromide (BPBr) in the formulation of a carbon paste electrode (GQD/BPBr/CPE). The GQD was synthesized and characterized TEM method and results confirmed them as being spherical with D~ of 5.0 nm. The applicability of the GQD/BPBr/CPE in voltammetric analysis of 5-fluorouracil was evaluated. The relations of oxidation currents and potentials of 5-fluorouracil with pH at the surface of GQD/BPBr/CPE were investigated and the results confirmed the involvement of electrons and protons in the electro-oxidation mechanism of 5-fluorouracil. In square wave voltammetry (SWV) analyses, the GQD/BPBr/CPE showed good sensitivity for 5-fluorouracil over a wide linear range of 0.001–400 μΜ and a detection limit of 0.5 nΜ was achieved. The GQD/BPBr/CPE was successfully applied for the determination of 5-fluorouracil in pharmaceutical samples and acceptable results were obtained.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"230-238"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46086679","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.002
farnaz-sadat Fattahi, A. Khodami, O. Avinc
Scanningelectron microscopy (SEM) has been utilized to examine the morphology and topography alterations in the surface of Poly(Lactic Acid)(PLA) fabrics due to UV/Ozoneirradiation. In the past decade, a growing attention in the usage of “Green Techniques” in industrial applications has been observed owing to many benefits such as low impurities and their relatively low cost to substitute the conventional processes.The effects of UV/Ozone irradiation along with the pretreatments with distilled water, hydrogen peroxide, and hydrogen peroxide/sodium silicate solutions on the surface morphology of the PLA fibers by means of SEM were investigated and the images were compared with that of virgin untreated samples.The observations presented dramatically increase in insurface roughness andsurface area of the samples after the treatment. Nano-size roughening (827 nm) has been clearly observed on the samples. The changes in morphology mainly surface roughness and surface area, on the PLA fabrics surface due to UV/Ozone irradiation seem to be due mainly to the intensified etching effect of the UV/Ozone process and these alterations maximized by the pretreatment of the fabrics with the hydrogen peroxide/sodium silicate solution.
{"title":"Nano-Structure Roughening on Poly(Lactic Acid)PLA Substrates: Scanning Electron Microscopy (SEM) Surface Morphology Characterization","authors":"farnaz-sadat Fattahi, A. Khodami, O. Avinc","doi":"10.22052/JNS.2020.02.002","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.002","url":null,"abstract":"Scanningelectron microscopy (SEM) has been utilized to examine the morphology and topography alterations in the surface of Poly(Lactic Acid)(PLA) fabrics due to UV/Ozoneirradiation. In the past decade, a growing attention in the usage of “Green Techniques” in industrial applications has been observed owing to many benefits such as low impurities and their relatively low cost to substitute the conventional processes.The effects of UV/Ozone irradiation along with the pretreatments with distilled water, hydrogen peroxide, and hydrogen peroxide/sodium silicate solutions on the surface morphology of the PLA fibers by means of SEM were investigated and the images were compared with that of virgin untreated samples.The observations presented dramatically increase in insurface roughness andsurface area of the samples after the treatment. Nano-size roughening (827 nm) has been clearly observed on the samples. The changes in morphology mainly surface roughness and surface area, on the PLA fabrics surface due to UV/Ozone irradiation seem to be due mainly to the intensified etching effect of the UV/Ozone process and these alterations maximized by the pretreatment of the fabrics with the hydrogen peroxide/sodium silicate solution.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"206-216"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42645034","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.019
Sepideh Amjad-Iranagh, Mahdi Zarif
TiO2 nano-particles were used in electroless plating bath to obtain Ni/P/nano-composite coatings. The coatings were heat treated at 200, 400, 600 and 700 oC and their chemical and physical properties were investigated and it was found that 400 oC was the optimum temperature for the heat treatment of the coatings. The micro-hardness test of coatings showed that the composite coatings, which contain TiO2 nano-particles, exhibit better properties of microhardness. X-ray diffraction (XRD) analysis indicated that at 400 oC, Ni3P phase is formed, and when the heating temperature is 600 oC the presence of TiO2 particles is seen. We have used scanning Electron Microscopy (SEM) to measure the surface morphology of the composite and plane deposits. Weight loss measurement, Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization Spectroscopy were utilized to study the corrosion resistance of coatings in 3.5 %wt NaCl solution. Corrosion resistance experiments indicated that presence of TiO2 nano particles in the electroless coatings matrix improved the corrosion resistance of the coatings. Heat-treatment improved the corrosion resistance of the coatings up to 400 oC but heating above 400 oC caused a decrease in corrosion resistance. Wear behavior of the samples indicated that presence of TiO2 particles improve the wear resistance.
{"title":"TiO2 nano-particle effect on the chemical and physical properties of Ni-P-TiO2 nanocomposite electroless coatings","authors":"Sepideh Amjad-Iranagh, Mahdi Zarif","doi":"10.22052/JNS.2020.02.019","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.019","url":null,"abstract":"TiO2 nano-particles were used in electroless plating bath to obtain Ni/P/nano-composite coatings. The coatings were heat treated at 200, 400, 600 and 700 oC and their chemical and physical properties were investigated and it was found that 400 oC was the optimum temperature for the heat treatment of the coatings. The micro-hardness test of coatings showed that the composite coatings, which contain TiO2 nano-particles, exhibit better properties of microhardness. X-ray diffraction (XRD) analysis indicated that at 400 oC, Ni3P phase is formed, and when the heating temperature is 600 oC the presence of TiO2 particles is seen. We have used scanning Electron Microscopy (SEM) to measure the surface morphology of the composite and plane deposits. Weight loss measurement, Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization Spectroscopy were utilized to study the corrosion resistance of coatings in 3.5 %wt NaCl solution. Corrosion resistance experiments indicated that presence of TiO2 nano particles in the electroless coatings matrix improved the corrosion resistance of the coatings. Heat-treatment improved the corrosion resistance of the coatings up to 400 oC but heating above 400 oC caused a decrease in corrosion resistance. Wear behavior of the samples indicated that presence of TiO2 particles improve the wear resistance.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"415-423"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44726195","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.006
M. Mazloum‐Ardakani, Z. Alizadeh
The modified glassy carbon electrode (GCE) was prepared with 6-amino-4-(3,4-dihydroxyphenyl)-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (pyrazole derivative (AMPC)) and functionalized multi-walled carbon nanotubes. In this research, electrocatalytic activity of nanocomposite (AMPC/MWCNTs) has been studied by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CHA) methods. The electrocatalytic properties of the AMPC/MWCNTs nanocomposite for cysteine oxidation was considerably enhanced as compared to only AMPC. The kinetic parameters including the electron transfer coefficient (α) and the heterogeneous constant rate (k’) for oxidation of cysteine was studied by CV method. The diffusion coefficient of cysteine was calculated with aid of chronoamperometry (D=9.51×10-6 cm2/s). The AMPC/MWCNTs modified electrode shows a linear response to cysteine in the range of 0.7 nM to 200.0 µM with detection limit of 0.16 nM. Also, differential pulse voltammetry was applied for the simultaneous determination of cysteine (CYS) and paracetamol (or acetaminophen, AC). Finally, the modified electrode was used for the detection of CYS and AC in human serums (real samples). The sensor produced good sensitivity, selectivity, reproducibility and stability features.
{"title":"A Certain Electrochemical Nanosensor Based on Functionalized Multi-Walled Carbon Nanotube for Determination of Cysteine in the Presence of Paracetamol","authors":"M. Mazloum‐Ardakani, Z. Alizadeh","doi":"10.22052/JNS.2020.02.006","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.006","url":null,"abstract":"The modified glassy carbon electrode (GCE) was prepared with 6-amino-4-(3,4-dihydroxyphenyl)-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (pyrazole derivative (AMPC)) and functionalized multi-walled carbon nanotubes. In this research, electrocatalytic activity of nanocomposite (AMPC/MWCNTs) has been studied by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CHA) methods. The electrocatalytic properties of the AMPC/MWCNTs nanocomposite for cysteine oxidation was considerably enhanced as compared to only AMPC. The kinetic parameters including the electron transfer coefficient (α) and the heterogeneous constant rate (k’) for oxidation of cysteine was studied by CV method. The diffusion coefficient of cysteine was calculated with aid of chronoamperometry (D=9.51×10-6 cm2/s). The AMPC/MWCNTs modified electrode shows a linear response to cysteine in the range of 0.7 nM to 200.0 µM with detection limit of 0.16 nM. Also, differential pulse voltammetry was applied for the simultaneous determination of cysteine (CYS) and paracetamol (or acetaminophen, AC). Finally, the modified electrode was used for the detection of CYS and AC in human serums (real samples). The sensor produced good sensitivity, selectivity, reproducibility and stability features.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"258-267"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46854796","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.013
Mohammad Reza Aflatoonian, S. Tajik, Hadi Beitollai, Somayeh Mohammadi, P. Jahani
The present study reports synthesis of MOWS2 nanocomposite followed by its characterization using energy dispersive X-ray spectroscopy (EDS), X-Ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Chronoamperometry (CHA), differential pulse voltammetry (DPV), and cyclic voltammetry (CV) have been used to examine electro-chemical behaviors of sulfite on MOWS2 nanocomposite modified SPE. Electro-chemical specification indicated very good electro-catalytic activities and surface area impact of MOWS2 nanocomposite. Oxidation signals of sulfite on MOWS2/SPE has been considerably increased in comparison to the bare SPE. Within optimum conditions, quantification of sulfite might range between 0.08 to 700.0 µM with a small determination limit of 0.02 µM based on S/N=3.The impact of scan rates has been explored. Finally, the MOWS2/SPE has been employed for detection of sulfite in real specimens. In general, an easy experimental method for manufacturing MOWS2 nanocomposite has been suggested that takes advantage of selectivity, reproducibility, and sensitivity toward electro-active specimens, as well as biological matrices.
{"title":"A High Performance Electrochemical Sensor for Sulfite Based on MOWS₂ Nanocomposite Modified Electrode","authors":"Mohammad Reza Aflatoonian, S. Tajik, Hadi Beitollai, Somayeh Mohammadi, P. Jahani","doi":"10.22052/JNS.2020.02.013","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.013","url":null,"abstract":"The present study reports synthesis of MOWS2 nanocomposite followed by its characterization using energy dispersive X-ray spectroscopy (EDS), X-Ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Chronoamperometry (CHA), differential pulse voltammetry (DPV), and cyclic voltammetry (CV) have been used to examine electro-chemical behaviors of sulfite on MOWS2 nanocomposite modified SPE. Electro-chemical specification indicated very good electro-catalytic activities and surface area impact of MOWS2 nanocomposite. Oxidation signals of sulfite on MOWS2/SPE has been considerably increased in comparison to the bare SPE. Within optimum conditions, quantification of sulfite might range between 0.08 to 700.0 µM with a small determination limit of 0.02 µM based on S/N=3.The impact of scan rates has been explored. Finally, the MOWS2/SPE has been employed for detection of sulfite in real specimens. In general, an easy experimental method for manufacturing MOWS2 nanocomposite has been suggested that takes advantage of selectivity, reproducibility, and sensitivity toward electro-active specimens, as well as biological matrices.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"337-347"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43369730","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.016
S. Foorginezhad, M. M. Zerafat
Polyhedral Oligomeric Silsesquioxanes (POSSs) are a class of hybrid structures synthesized through hydrolytic condensation (Sol-Gel method) of trifunctional silane monomers under specific conditions. Octavinyl silsesquioxane (OVS) nanostructures are comprised of a rigid inorganic silica core surrounded by vinyl functional groups with an under-developed synthesis procedure. Generally, POSS morphology, yield and crystallinity depend strongly on synthesis conditions such as solvent type, synthesis temperature, sequence of reagents addition, water/monomer molar ratio, etc. In this study, effect of solvent properties on the formation of OVS compounds, their morphology and crystallite size was studied under specific conditions. Finally, n-pentanol and butanol as the most efficient solvents were suggested according to solvent characteristics, theoretical background reported in previous studies and experimental results. Different characterization techniques such as XRD to investigate crystallinity and crystallite size, FE-SEM and TEM to determine the morphology, EDX to identify elemental and chemical composition, C-NMR and 1H-NMR to confirm the attachment of vinyl groups and FTIR to define chemical bonds, were employed to confirm the formation of the as-prepared structure. Based on the results, butanol and n-pentanol represent the best results regarding crystallinity and size by optimizing other influential parameters.
{"title":"Effect of Solvent properties on Crystallinity and Morphology of Octavinyl-POSS: A Comparative Study","authors":"S. Foorginezhad, M. M. Zerafat","doi":"10.22052/JNS.2020.02.016","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.016","url":null,"abstract":"Polyhedral Oligomeric Silsesquioxanes (POSSs) are a class of hybrid structures synthesized through hydrolytic condensation (Sol-Gel method) of trifunctional silane monomers under specific conditions. Octavinyl silsesquioxane (OVS) nanostructures are comprised of a rigid inorganic silica core surrounded by vinyl functional groups with an under-developed synthesis procedure. Generally, POSS morphology, yield and crystallinity depend strongly on synthesis conditions such as solvent type, synthesis temperature, sequence of reagents addition, water/monomer molar ratio, etc. In this study, effect of solvent properties on the formation of OVS compounds, their morphology and crystallite size was studied under specific conditions. Finally, n-pentanol and butanol as the most efficient solvents were suggested according to solvent characteristics, theoretical background reported in previous studies and experimental results. Different characterization techniques such as XRD to investigate crystallinity and crystallite size, FE-SEM and TEM to determine the morphology, EDX to identify elemental and chemical composition, C-NMR and 1H-NMR to confirm the attachment of vinyl groups and FTIR to define chemical bonds, were employed to confirm the formation of the as-prepared structure. Based on the results, butanol and n-pentanol represent the best results regarding crystallinity and size by optimizing other influential parameters.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"375-391"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41758860","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 : 2020-04-01DOI: 10.22052/JNS.2020.02.007
Mojgan Mirtalebi, A. Rajaei, M. Bahmaei, A. Khosroushahi
The present study aimed to evaluate the effect of surfactant composition on the physical properties of nanostructured lipid carriers (NLCs) containing wheat germ oil (WGO) and to investigate the influence of both surfactant composition and pH on the oxidative stability of WGO encapsulated within the NLCs. The results showed that the smallest particle size (52.7 nm) was related to the NLC with the poloxamer-to-lipid ratio of 1:1 (Polox-NLC-1). Polox-NLC-1 not only showed good stability during storage, but also indicated a suitable physical structure from differential scanning calorimetry (DSC) analysis. The oxidative stability results indicated that the NLCs were more successful than O/W emulsion in protecting the WGO from oxidation. Additionally, the oxidative stability of the NLC with the poloxamer-to-lipid ratio of 2:1 (Polox-NLC-2) looked promising. Furthermore, NLCs prepared with the surfactant of poloxamer as a non-ionic surfactant had greater oxidative stability at high pH, and NLC prepared with sodium dodecyl sulfate (SDS) as an ionic surfactant had greater oxidative stability at low pH. These findings indicated that NLC could be an effective delivery and protection system for the WGO as a source of bioactive compounds.
{"title":"Storage Stability of Wheat Germ Oil Encapsulated within Nanostructured Lipid Carriers","authors":"Mojgan Mirtalebi, A. Rajaei, M. Bahmaei, A. Khosroushahi","doi":"10.22052/JNS.2020.02.007","DOIUrl":"https://doi.org/10.22052/JNS.2020.02.007","url":null,"abstract":"The present study aimed to evaluate the effect of surfactant composition on the physical properties of nanostructured lipid carriers (NLCs) containing wheat germ oil (WGO) and to investigate the influence of both surfactant composition and pH on the oxidative stability of WGO encapsulated within the NLCs. The results showed that the smallest particle size (52.7 nm) was related to the NLC with the poloxamer-to-lipid ratio of 1:1 (Polox-NLC-1). Polox-NLC-1 not only showed good stability during storage, but also indicated a suitable physical structure from differential scanning calorimetry (DSC) analysis. The oxidative stability results indicated that the NLCs were more successful than O/W emulsion in protecting the WGO from oxidation. Additionally, the oxidative stability of the NLC with the poloxamer-to-lipid ratio of 2:1 (Polox-NLC-2) looked promising. Furthermore, NLCs prepared with the surfactant of poloxamer as a non-ionic surfactant had greater oxidative stability at high pH, and NLC prepared with sodium dodecyl sulfate (SDS) as an ionic surfactant had greater oxidative stability at low pH. These findings indicated that NLC could be an effective delivery and protection system for the WGO as a source of bioactive compounds.","PeriodicalId":16523,"journal":{"name":"Journal of Nanostructures","volume":"10 1","pages":"268-278"},"PeriodicalIF":1.4,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44856492","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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