Pub Date : 2018-12-06DOI: 10.4236/WJNSE.2018.84004
S. Shah, K. Kumar
Heat exchangers have its major application in automobile, air condition, refrigerator, power plants, and many others. Heat transfer characteristics and performance of Copper spiral heat exchanger are investigated and compared with pure water. Nanofluid can enhance thermos-physical properties. Experiment is carried out for water based SiO2 Nanofluid with 15 nm average sized nanoparticle at varying air velocity and mass flow rate of fluid to investigate its effect on heat transfer coefficient. From the experimental data, a closed form solution for Nusselt number has been calculated using ∈-NTU method. A new correlation has been proposed as a function of Reynolds number and Prandtl number. The heat transfer rate, effectiveness, has been significantly higher compared to pure water and with increasing volume fraction of nanoparticles.
{"title":"Experimental Study & Heat Transfer Analysis on Copper Spiral Heat Exchanger Using Water Based SiO2 Nanofluid as Coolant","authors":"S. Shah, K. Kumar","doi":"10.4236/WJNSE.2018.84004","DOIUrl":"https://doi.org/10.4236/WJNSE.2018.84004","url":null,"abstract":"Heat exchangers have its major application in automobile, air condition, refrigerator, power plants, and many others. Heat transfer characteristics and performance of Copper spiral heat exchanger are investigated and compared with pure water. Nanofluid can enhance thermos-physical properties. Experiment is carried out for water based SiO2 Nanofluid with 15 nm average sized nanoparticle at varying air velocity and mass flow rate of fluid to investigate its effect on heat transfer coefficient. From the experimental data, a closed form solution for Nusselt number has been calculated using ∈-NTU method. A new correlation has been proposed as a function of Reynolds number and Prandtl number. The heat transfer rate, effectiveness, has been significantly higher compared to pure water and with increasing volume fraction of nanoparticles.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"08 1","pages":"57-68"},"PeriodicalIF":0.0,"publicationDate":"2018-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46370472","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 : 2018-09-28DOI: 10.4236/WJNSE.2018.83003
M. E. Khosroshahi, M. Tajabadi
We describe the results of 532 nm pulse laser-induced breakdown spectroscopy (LIBS) of two samples of magnetite nanoparticles (SPIONs) nanoferrofluid synthesized at room (S1) and elevated temperatures (S2) and at three different laser energy levels and pulse frequency. The size of magnetite nanoparticles, size distribution, magnetic crystalline phase and magnetization were analyzed and measured using transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD) and vibrating sample magnetometry (VSM). The SPIONs showed a distribution between 4 - 22 nm with a peak about 12 nm and saturation magnetization of about 65 emu/g. The Saha-Boltzmann analysis of spectra for medium energy level (1050 mJ) yields plasma temperatures of (3881 ± 200) K and (26,047 ± 200) K for Fe I and OV as the lowest and highest temperatures respectively. A range of corresponding electron density (Ne-) of (0.47 - 6.80) × 1020, (0.58 - 8.30) × 1020 and (0.69 - 9.96) × 1020 cm-3 were determined at 860, 1050 and 1260 mJ respectively using the estimated CCD pictures. The results confirmed a higher elements ratio for S1 than S2 and the signal intensity indicated a non-linear behaviour as a function of pulse frequency with the maximum ratio value at 3 Hz. At higher frequency of 6 Hz no such turning point was observed. The highest and lowest temperatures corresponded to Fe I and OV respectively. The LIBS technique can be utilized to study, characterize and determine the elements ratio required in most applications involving the synthesizing process.
{"title":"Measurements of Pulsed 532 nm Laser Breakdown Spectroscopy of Synthesized Magnetite Nanoferrofluid","authors":"M. E. Khosroshahi, M. Tajabadi","doi":"10.4236/WJNSE.2018.83003","DOIUrl":"https://doi.org/10.4236/WJNSE.2018.83003","url":null,"abstract":"We describe the results of 532 nm pulse laser-induced breakdown spectroscopy (LIBS) of two samples of magnetite nanoparticles (SPIONs) nanoferrofluid synthesized at room (S1) and elevated temperatures (S2) and at three different laser energy levels and pulse frequency. The size of magnetite nanoparticles, size distribution, magnetic crystalline phase and magnetization were analyzed and measured using transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD) and vibrating sample magnetometry (VSM). The SPIONs showed a distribution between 4 - 22 nm with a peak about 12 nm and saturation magnetization of about 65 emu/g. The Saha-Boltzmann analysis of spectra for medium energy level (1050 mJ) yields plasma temperatures of (3881 ± 200) K and (26,047 ± 200) K for Fe I and OV as the lowest and highest temperatures respectively. A range of corresponding electron density (Ne-) of (0.47 - 6.80) × 1020, (0.58 - 8.30) × 1020 and (0.69 - 9.96) × 1020 cm-3 were determined at 860, 1050 and 1260 mJ respectively using the estimated CCD pictures. The results confirmed a higher elements ratio for S1 than S2 and the signal intensity indicated a non-linear behaviour as a function of pulse frequency with the maximum ratio value at 3 Hz. At higher frequency of 6 Hz no such turning point was observed. The highest and lowest temperatures corresponded to Fe I and OV respectively. The LIBS technique can be utilized to study, characterize and determine the elements ratio required in most applications involving the synthesizing process.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"8 1","pages":"39-55"},"PeriodicalIF":0.0,"publicationDate":"2018-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49112304","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 : 2018-06-29DOI: 10.4236/WJNSE.2018.82002
E. Janardhan, M. M. Reddy, P. V. Reddy, M. Reddy
SnO nanoparticles were prepared by addition of HCl to tin oxide solution. The synthesis process is simplified for SnO nuclei. We herein report a better-defined and simple procedure for synthesis of SnO particles in a simple hydrothermal process.
{"title":"Synthesis of SnO Nanopatricles—A Hydrothermal Approach","authors":"E. Janardhan, M. M. Reddy, P. V. Reddy, M. Reddy","doi":"10.4236/WJNSE.2018.82002","DOIUrl":"https://doi.org/10.4236/WJNSE.2018.82002","url":null,"abstract":"SnO nanoparticles were prepared by addition of HCl to tin oxide solution. The synthesis process is simplified for SnO nuclei. We herein report a better-defined and simple procedure for synthesis of SnO particles in a simple hydrothermal process.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"8 1","pages":"33-37"},"PeriodicalIF":0.0,"publicationDate":"2018-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43209020","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 : 2018-05-09DOI: 10.4236/WJNSE.2018.81001
J. Pani, Royana Singh, S. Singh
Characterization is absolutely necessary and is a must in order to understand and estimate different silver nanoparticle (nm) size in specific group wise manner which corresponds to group wise in number & sizes, and their importance and effect on biological tissue and organs with agglomeration for nano toxicological studies in environments, the acute toxicity of colloidal silver nano particles (AgNps) were studied in fresh dissected tissues of Swiss Albino mice and their fetuses. In this manuscript, an attempt is made to demonstrate the synthesis and characterization of silver nano particles with a wide range of sizes (from 2.75 nm up to 1908.2 nm in radius) by reducing silver nitrate powder with polyvinyl pyrollidone in aqueous solutions in the presence of a sodium borohydride stabilizer. The resulting particles were found spherical aggregates with a rough surface and poly dispersity index below 18.26% (>0.783 PDI). The particle optical, cumulative, diluents and electrical conductivity properties were examined by dynamic light scattering and zeta potential but morphology was evaluated after examination by transmission electron microscopy & image-j. Silver nanoparticles were directly coated with polyvinyl pyrollidone with a sodium borohydride stabilizer. Optical properties on a single-particle level were studied by means of auto correlation function measurements. The effective poly dispersity index of the charged silver nanoparticles was low enough to form a colloidal crystal at low ionic strength. Colloidal form is found more toxic than suspended particles in 1.5 molar sodium chloride solution; this shows increase of silver nanoparticles size due to agglomeration, will reduce the toxicity but increase teratogenicity.
{"title":"Characterization of Polyvinyl Pyrollidone Coated Sodium Borohydride Stabilized Particle Colloidal Silver Fresh None Filtered and Nano Filtered Solution Made up of Magnetic Stirring and Cooling Method","authors":"J. Pani, Royana Singh, S. Singh","doi":"10.4236/WJNSE.2018.81001","DOIUrl":"https://doi.org/10.4236/WJNSE.2018.81001","url":null,"abstract":"Characterization is absolutely necessary and is a must in order to understand and estimate different silver nanoparticle (nm) size in specific group wise manner which corresponds to group wise in number & sizes, and their importance and effect on biological tissue and organs with agglomeration for nano toxicological studies in environments, the acute toxicity of colloidal silver nano particles (AgNps) were studied in fresh dissected tissues of Swiss Albino mice and their fetuses. In this manuscript, an attempt is made to demonstrate the synthesis and characterization of silver nano particles with a wide range of sizes (from 2.75 nm up to 1908.2 nm in radius) by reducing silver nitrate powder with polyvinyl pyrollidone in aqueous solutions in the presence of a sodium borohydride stabilizer. The resulting particles were found spherical aggregates with a rough surface and poly dispersity index below 18.26% (>0.783 PDI). The particle optical, cumulative, diluents and electrical conductivity properties were examined by dynamic light scattering and zeta potential but morphology was evaluated after examination by transmission electron microscopy & image-j. Silver nanoparticles were directly coated with polyvinyl pyrollidone with a sodium borohydride stabilizer. Optical properties on a single-particle level were studied by means of auto correlation function measurements. The effective poly dispersity index of the charged silver nanoparticles was low enough to form a colloidal crystal at low ionic strength. Colloidal form is found more toxic than suspended particles in 1.5 molar sodium chloride solution; this shows increase of silver nanoparticles size due to agglomeration, will reduce the toxicity but increase teratogenicity.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"8 1","pages":"1-31"},"PeriodicalIF":0.0,"publicationDate":"2018-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44417273","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 : 2017-06-21DOI: 10.4236/WJNSE.2017.72002
S. Abdullayeva, T. Orujov, N. Musayeva, R. Jabbarov, S. Orujov
Increasing light extraction efficiency is an important task when it comes to manufacturing a powerful white light emitting diode with high luminous flux per watt. In this paper the fabrication of a pyramid-shaped 3-dimensional phosphor coating is reported. It is represented by a phosphor cover, shaped into an array of pyramid like formations. It is proposed that such a structure can improve the light extraction efficiency and the color distribution characteristics of any phosphor-converted white LED. The luminous flux and luminous efficacy are being studied as a function of the forward current across the die. It was found out that with this kind of technique it was possible to achieve an 8% - 14% increase in the efficacy of the pc-LED. This increase of light output power is being attributed to the reduction of the phenomena of total internal reflection (TIR) inside the packaging module.
{"title":"Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs","authors":"S. Abdullayeva, T. Orujov, N. Musayeva, R. Jabbarov, S. Orujov","doi":"10.4236/WJNSE.2017.72002","DOIUrl":"https://doi.org/10.4236/WJNSE.2017.72002","url":null,"abstract":"Increasing light extraction efficiency is an important task when it comes to manufacturing a powerful white light emitting diode with high luminous flux per watt. In this paper the fabrication of a pyramid-shaped 3-dimensional phosphor coating is reported. It is represented by a phosphor cover, shaped into an array of pyramid like formations. It is proposed that such a structure can improve the light extraction efficiency and the color distribution characteristics of any phosphor-converted white LED. The luminous flux and luminous efficacy are being studied as a function of the forward current across the die. It was found out that with this kind of technique it was possible to achieve an 8% - 14% increase in the efficacy of the pc-LED. This increase of light output power is being attributed to the reduction of the phenomena of total internal reflection (TIR) inside the packaging module.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"7 1","pages":"17-24"},"PeriodicalIF":0.0,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48781704","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 : 2017-03-31DOI: 10.4236/WJNSE.2017.71001
S. K. Dora
Real-time atomic force microscopy (AFM) imaging revealed for the first time, the detailed growth/dissolution mechanism of Lauryl glycol (LG) or 1, 2 dodecanediol molecules on HOPG at the nano-level after recrystallizing them from chloroform solution. At the early stage of recrystallization, parallelogram-like-structures having lengths of several microns and distinct widths (between ~ 100 - 400 nm) were observed. Growth/dissolution behavior of these parallelogram-like-structures as a function of time was investigated. While dissolution occurred along all three dimensions, growth was found to be strictly two dimensional. Both the growth and dissolution process were found to be logarithmic in nature. The average growth rates along their length and width were found to be 11 nm/min and 1.5 nm/min respectively. Average dissolution rate in percentage on HOPG surface was found to be ~ 0.078%/min. Based upon the recrystallization of LG molecules schematics are drawn for a better understanding of the recrystallization process.
{"title":"Real Time Recrystallization Study of 1, 2 Dodecanediol on Highly Oriented Pyrolytic Graphite (HOPG) by Tapping Mode Atomic Force Microscopy","authors":"S. K. Dora","doi":"10.4236/WJNSE.2017.71001","DOIUrl":"https://doi.org/10.4236/WJNSE.2017.71001","url":null,"abstract":"Real-time atomic force microscopy (AFM) imaging revealed for the first time, the detailed growth/dissolution mechanism of Lauryl glycol (LG) or 1, 2 dodecanediol molecules on HOPG at the nano-level after recrystallizing them from chloroform solution. At the early stage of recrystallization, parallelogram-like-structures having lengths of several microns and distinct widths (between ~ 100 - 400 nm) were observed. Growth/dissolution behavior of these parallelogram-like-structures as a function of time was investigated. While dissolution occurred along all three dimensions, growth was found to be strictly two dimensional. Both the growth and dissolution process were found to be logarithmic in nature. The average growth rates along their length and width were found to be 11 nm/min and 1.5 nm/min respectively. Average dissolution rate in percentage on HOPG surface was found to be ~ 0.078%/min. Based upon the recrystallization of LG molecules schematics are drawn for a better understanding of the recrystallization process.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"07 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43938602","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 : 2016-11-08DOI: 10.4236/WJNSE.2016.64014
M. Salem, T. Meakhail, M. Bassily, S. Torii
This experimental study is performed to investigate heat transfer performance of a multi-heat pipe cooling device in the condition of different filling ratios (40%, 60%, 80% and 100%) and different constant heat fluxes (10 - 30 W). Here, pure water (distilled water) and graphene oxide (GO)/water nanofluids are employed respectively as working fluid. GO/water nanofluids were synthesized by the modified Hummers method with 0.05%, 0.10%, 0.15%, and 0.20% volume concentrations. Multi-heat pipe is fabricated from copper; the heating and cooling sections are the same size and both are connected by four circular parallel tubes. Temperature fields and thermal resistance are measured for different filling ratio, heat fluxes and volume concentrations. The results indicated that the thermal performance of heat pipe increased with increasing the concentration of GO nanoparticles in the base fluid, while the maximum heat transfer enhancement was observed at 0.20% volume concentration. GO/water nanofluids showed lower thermal resistance compared to pure water; the optimal thermal resistance was obtained at 100% filling charge ratio with 0.20% volume concentration. Studies were also demonstrated that heat transfer coefficient of the heat pipe significantly increases with increasing the input heat flux and GO nanoparticles concentration.
{"title":"Experimental Study of Filling Ratio Effect on the Thermal Performance in a Multi-Heat Pipe with Graphene Oxide/Water Nanofluids","authors":"M. Salem, T. Meakhail, M. Bassily, S. Torii","doi":"10.4236/WJNSE.2016.64014","DOIUrl":"https://doi.org/10.4236/WJNSE.2016.64014","url":null,"abstract":"This experimental study is performed to investigate heat transfer performance of a multi-heat pipe cooling device in the condition of different filling ratios (40%, 60%, 80% and 100%) and different constant heat fluxes (10 - 30 W). Here, pure water (distilled water) and graphene oxide (GO)/water nanofluids are employed respectively as working fluid. GO/water nanofluids were synthesized by the modified Hummers method with 0.05%, 0.10%, 0.15%, and 0.20% volume concentrations. Multi-heat pipe is fabricated from copper; the heating and cooling sections are the same size and both are connected by four circular parallel tubes. Temperature fields and thermal resistance are measured for different filling ratio, heat fluxes and volume concentrations. The results indicated that the thermal performance of heat pipe increased with increasing the concentration of GO nanoparticles in the base fluid, while the maximum heat transfer enhancement was observed at 0.20% volume concentration. GO/water nanofluids showed lower thermal resistance compared to pure water; the optimal thermal resistance was obtained at 100% filling charge ratio with 0.20% volume concentration. Studies were also demonstrated that heat transfer coefficient of the heat pipe significantly increases with increasing the input heat flux and GO nanoparticles concentration.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"06 1","pages":"153-164"},"PeriodicalIF":0.0,"publicationDate":"2016-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70881566","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 : 2016-11-08DOI: 10.4236/WJNSE.2016.64013
E. Chainoglou, V. Karagkiozaki, T. Choli-Papadopoulou, Charisios Mavromanolis, A. Laskarakis, S. Logothetidis
Currently-used mechanical and biological heart valve prostheses have a satisfactory short-term performance, but may exhibit several major drawbacks on the long-term. Mechanical prostheses, based on carbon, metallic and polymeric components, require permanent anticoagulation treatment, and their usage often leads to adverse reactions, e.g. thromboembolic complications and endocarditis. In recent years, there is a need for a heart valve prosthesis that can grow, repair and remodel. The concept of tissue engineering offers good prospects into the development of such a device. An ideal scaffold should mimic the structural and purposeful profile of materials found in the natural extracellular matrix (ECM) architecture. The goal of this study was to develop cellulose acetate scaffolds (CA) for valve tissue regeneration. After their thorough physicochemical and biological characterization, a biofunctionalization process was made to increase the cell proliferation. Especially, the surface of scaffolds was amplified with functional molecules, such as RGD peptides (Arg-Gly-Asp) and YIGSRG laminins (Tyrosine-Isoleucine-Glycine-Serine-Arginine-Glycine) which immobilized through biotin-streptavidin bond, the strongest non-covalent bond in nature. Last step was to successfully coat an aortic metallic valve with CA biofunctionallized nanoscaffolds and cultivate cells in order to create an anatomical structure comparable to the native valve. Promising results have been obtained with CA-based nanoscaffolds. We found that cells grown successfully on the biofunctionalized valve surface thereby scaffolds that resemble the native tissues, elaborated with bioactive factors such as RGD peptides and laminins not only make the valve’s surface biocompatible but also they could promote endothyliazation of cardiac valves causing an anti-coagulant effect
{"title":"Development of Biofunctionalized Cellulose Acetate Nanoscaffolds for Heart Valve Tissue Engineering","authors":"E. Chainoglou, V. Karagkiozaki, T. Choli-Papadopoulou, Charisios Mavromanolis, A. Laskarakis, S. Logothetidis","doi":"10.4236/WJNSE.2016.64013","DOIUrl":"https://doi.org/10.4236/WJNSE.2016.64013","url":null,"abstract":"Currently-used mechanical and biological heart valve prostheses have a satisfactory short-term performance, but may exhibit several major drawbacks on the long-term. Mechanical prostheses, based on carbon, metallic and polymeric components, require permanent anticoagulation treatment, and their usage often leads to adverse reactions, e.g. thromboembolic complications and endocarditis. In recent years, there is a need for a heart valve prosthesis that can grow, repair and remodel. The concept of tissue engineering offers good prospects into the development of such a device. An ideal scaffold should mimic the structural and purposeful profile of materials found in the natural extracellular matrix (ECM) architecture. The goal of this study was to develop cellulose acetate scaffolds (CA) for valve tissue regeneration. After their thorough physicochemical and biological characterization, a biofunctionalization process was made to increase the cell proliferation. Especially, the surface of scaffolds was amplified with functional molecules, such as RGD peptides (Arg-Gly-Asp) and YIGSRG laminins (Tyrosine-Isoleucine-Glycine-Serine-Arginine-Glycine) which immobilized through biotin-streptavidin bond, the strongest non-covalent bond in nature. Last step was to successfully coat an aortic metallic valve with CA biofunctionallized nanoscaffolds and cultivate cells in order to create an anatomical structure comparable to the native valve. Promising results have been obtained with CA-based nanoscaffolds. We found that cells grown successfully on the biofunctionalized valve surface thereby scaffolds that resemble the native tissues, elaborated with bioactive factors such as RGD peptides and laminins not only make the valve’s surface biocompatible but also they could promote endothyliazation of cardiac valves causing an anti-coagulant effect","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"06 1","pages":"129-152"},"PeriodicalIF":0.0,"publicationDate":"2016-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70882001","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 : 2016-11-08DOI: 10.4236/WJNSE.2016.64016
Chek Yee Ooi, S. Lim
This paper presents the quasi-ballistic electron transport of a symmetric double-gate (DG) nano-MOSFET with 10 nm gate length and implementation of logical NOT transistor circuit using this nano-MOSFET. Theoretical calculation and simulation using NanoMOS have been done to obtain parameters such as ballistic efficiency, backscattering mean free path, backscattering coefficient, critical length, thermal velocity, capacitances, resistance and drain current. NanoMOS is an on-line device simulator. Theoretical and simulated drain current per micro of width is closely matched. Transistor loaded NOT gate is simulated using WinSpice. Theoretical and simulated value of rise time, fall time, propagation delay and maximum signal frequency of logical NOT transistor level circuit is closely matched. Quasi-ballistic transport has been investigated in this paper since modern MOSFET devices operate between the drift-diffusion and ballistic regimes. This paper aims to enable modern semiconductor device engineers to become familiar with both approaches.
{"title":"Study of Timing Characteristics of NOT Gate Transistor Level Circuit Implemented Using Nano-MOSFET by Analyzing Sub-Band Potential Energy Profile and Current-Voltage Characteristic of Quasi-Ballistic Transport","authors":"Chek Yee Ooi, S. Lim","doi":"10.4236/WJNSE.2016.64016","DOIUrl":"https://doi.org/10.4236/WJNSE.2016.64016","url":null,"abstract":"This paper presents the quasi-ballistic electron transport of a symmetric double-gate (DG) nano-MOSFET with 10 nm gate length and implementation of logical NOT transistor circuit using this nano-MOSFET. Theoretical calculation and simulation using NanoMOS have been done to obtain parameters such as ballistic efficiency, backscattering mean free path, backscattering coefficient, critical length, thermal velocity, capacitances, resistance and drain current. NanoMOS is an on-line device simulator. Theoretical and simulated drain current per micro of width is closely matched. Transistor loaded NOT gate is simulated using WinSpice. Theoretical and simulated value of rise time, fall time, propagation delay and maximum signal frequency of logical NOT transistor level circuit is closely matched. Quasi-ballistic transport has been investigated in this paper since modern MOSFET devices operate between the drift-diffusion and ballistic regimes. This paper aims to enable modern semiconductor device engineers to become familiar with both approaches.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"06 1","pages":"177-188"},"PeriodicalIF":0.0,"publicationDate":"2016-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70882002","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 : 2016-11-08DOI: 10.4236/WJNSE.2016.64015
Xiuxia Zhang, Chaohui Li, Qianyu Ji
Nickel oxide/copper oxide composites are prepared. Then the composites were transferred into autoclave and thermal sinter under different temperature and different time. As-prepared composites were analyzed by XRD, and it was concluded that with the increase of hydrothermal time, content of NiO and Ni0.75Cu0.25O increases, but particles become smaller; it would improve the electrochemical activity. By SEM images directed lower crystallinity of composites, deeper porosity and rougher surface would have better electrochemical activity. The electrochemical performance was investigated by cyclic voltametry, AC impedance and galvanostatic charge-discharge. All results show that under the condition of 150°C 30 h, the electrochemical performance is the best. The specific capacitance was 225.67 F·g-1 at the charge-discharge current of 1 A·g-1.
{"title":"Preparation of Electrode of Copper-Nickel Composite Material and Its Capacitance Performance","authors":"Xiuxia Zhang, Chaohui Li, Qianyu Ji","doi":"10.4236/WJNSE.2016.64015","DOIUrl":"https://doi.org/10.4236/WJNSE.2016.64015","url":null,"abstract":"Nickel oxide/copper oxide composites are prepared. Then the composites were transferred into autoclave and thermal sinter under different temperature and different time. As-prepared composites were analyzed by XRD, and it was concluded that with the increase of hydrothermal time, content of NiO and Ni0.75Cu0.25O increases, but particles become smaller; it would improve the electrochemical activity. By SEM images directed lower crystallinity of composites, deeper porosity and rougher surface would have better electrochemical activity. The electrochemical performance was investigated by cyclic voltametry, AC impedance and galvanostatic charge-discharge. All results show that under the condition of 150°C 30 h, the electrochemical performance is the best. The specific capacitance was 225.67 F·g-1 at the charge-discharge current of 1 A·g-1.","PeriodicalId":66816,"journal":{"name":"纳米科学与工程(英文)","volume":"06 1","pages":"165-176"},"PeriodicalIF":0.0,"publicationDate":"2016-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70881780","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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