nanorod

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1 - Application of ZnO Nanorods for the Synthesis of Thiazole Derivatives via Multicomponent Reactions in Water
Ali Varasteh Moradi

Simple three-component reactions between dialkyl acetylenedicarboxylate, primary amines and isothiocyanates in the presence of catalytic amount of ZnO nanorods are investigated in water at room temperature which produced thiazole derivatives in good yields.

Simple three-component reactions between dialkyl acetylenedicarboxylate, primary amines and isothiocyanates in the presence of catalytic amount of ZnO nanorods are investigated in water at room temperature which produced thiazole derivatives in good yields. تفاصيل المقالة

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2 - Improve Synthesis of Iron Oxide Nanorode with Hydrothermal Method
M. Aghazadeh Fatemeh Aghazadeh

Maghemite and magnetite nanoparticles and nanorode are now losing interests in the field of nanobiotechnology and pharmaceutical for their applications. This paper reports on a hydrothermal process for the synthesis of Fe2 O3 in the γ-phases nanorodes, when the hy أکثر

Maghemite and magnetite nanoparticles and nanorode are now losing interests in the field of nanobiotechnology and pharmaceutical for their applications. This paper reports on a hydrothermal process for the synthesis of Fe2 O3 in the γ-phases nanorodes, when the hydrothermal temperature was 100 ̊ C. The uniqueness of the method lies in the use of ferrous ammonium sulphate, hexamine was added as the stabilizer and hydrolyzing agents. The crystal structure, shape particle and magnetic properties of the samples were determined by X-ray diffraction (XRD) and Transmission electron microscopy (TEM) and magnetometer (AGFM), respectively. The particle size was 60nm and length in the range of 300nm. The magnetic behavior of the particles was like the typical behavior of superparamagnetic particles, so smaller particles can improve the magnetic properties and decreasing the coercivity. تفاصيل المقالة

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3 - Two efficient approaches for improving field emission properties of ZnO NRs
Marziyeh Advand Bahram Azizollah Ganji Mohammad Reza Kolahdouz

The structure of pure and Al doped ZnO (AZO) nanorods (NRs) has been studied. A post annealing procedure in oxygen ambience at 400ﹾC were used in order to improve crystallinity of both group of samples. The XRD patterns illustrate that the Al doped ZnO NRs were successf أکثر

The structure of pure and Al doped ZnO (AZO) nanorods (NRs) has been studied. A post annealing procedure in oxygen ambience at 400ﹾC were used in order to improve crystallinity of both group of samples. The XRD patterns illustrate that the Al doped ZnO NRs were successfully synthesized using our method. Then, the field emission properties of the as grown NRs before and after annealing process were evaluated by our home-made setup. Experimental results show that Al density in ZnO NRs directly affects FE properties of these samples. The oxygen post annealing process leads to a significant improvement in the field emission performances of pristine and doped ZnO NRs including considerably lower turn on voltage, and higher emission current. تفاصيل المقالة

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4 - استفاده از نانومیله های طلا در درمان سلول های سرطانی سینه به روش نورگرما درمانی و بررسی توزیع بافتی آن در مدل موشی
محسن کلانتری کاظم پریور مجتبی صلوتی مهرداد حمیدی سعید عمادی

1024x768Normal0falsefalsefalseEN-USX-NONEAR-SA /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-st أکثر

1024x768Normal0falsefalsefalseEN-USX-NONEAR-SA /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif"; mso-bidi-font-family:"B Nazanin";} >زمینه و هدف:روش های مختلفی برای درمان سرطانسینه وجود دارد که بعضی از آن ها استاندارد و رایج بوده و برخی در مرحلۀ آزمایش های بالینی است.فوتوترمال تراپی روشی است که در آن از انرژی نور لیزر به طور انتخابی جهت ایجاد گرمای کافی برای از بین بردن سلول‌های سرطانی استفاده می‌شود. در تحقیق حاضر اثر درمانی نانومیله های طلا به روش نورگرمادرمانی پلاسمونی و به عنوان یک روش غیر تهاجمی بر روی سلول های سرطانی سینه بررسی گردید.روش کار:نانومیله های طلا با پیک جذبی 808 نانومتر به روش Seed-mediated growthسنتز و با پلی اتیلن گلیکول تیوله پوشش دار گردیده و مشخصات آن با استفاده از تصویر میکروسکوپ الکترونی گذاره(TEM) و اسپکتروفوتومتر مرئی-فرابنفش(UV-vis) تایید شد. پایداری و زیست پذیری آن ها به روش تست MTT بررسی گردید. سپس با استفاده از لیزر مادون قرمز نزدیک(NIR) با طول موج nm808، توان mW80 و بصورت پیوسته به مدت 3 دقیقه، اثر درمانی این کمپلکس بر روی سلولهای سرطانی سینه(رده سلولی SK-BR-3) به صورت برون تنی مورد مطالعه قرار گرفت. هم چنین توزیع بافتی کمپلکس در بدن موشBALB/c سالم بررسی شد.یافته ها:تصاویر میکروگراف نشان داد که نانومیله ها به طور میانگین دارای طول 537 و عرض312 نانومتر بوده و هم چنین وجود دو پیک جذبی 804 و 520 نانومتر به دست آمده از طیف جذبی UV-vis میله ای بودن و اندازه نانوذرات را تایید کرد. در طی مطالعات فوتوترمال‌تراپی برون‌ تنی، کمپلکس GNR-PEG به همراه تابش نور لیزر باعث مرگ 32% از سلول‌های سرطانی سینه(SK-Br-3) نسبت به گروه کنترل گردید. نتایج توزیع بافتی نشان داد که کمپلکس سنتز شده، توزیع غیر طبیعی در بدن ندارد.نتیجه گیری:نتایج این تحقیق بیانگر توانایی درمان بافت سرطانی سینه با استفاده از نانومیله های طلای پوشش دار شده به روش فوتوترمال‌ تراپی در مدل موشی می‌باشد. می توان با نشاندار کردن نانومیله های طلا(از قبیل آنتی بادی) راندمان درمان را بالا برد و درمان را اختصاصی نمود تا از آسیب به سلول های سالم جلوگیری شود. تفاصيل المقالة

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5 - An Analytical Study on Surface Energy Effect on Free Longitudinal Vibration of Cracked Nanorods
H Shokrollahi R Nazemnezhad

10.22034/jsm.2023.1987288.1778

The present work analytically studies the free longitudinal vibration of nanorods in the presence of cracks based on the surface elasticity theory. To this end, governing equations of motion and corresponding boundary conditions are obtained using Hamilton’s princ أکثر

The present work analytically studies the free longitudinal vibration of nanorods in the presence of cracks based on the surface elasticity theory. To this end, governing equations of motion and corresponding boundary conditions are obtained using Hamilton’s principle. Due to considering the surface stress effect, as well as the surface density and the surface Lamé constants, the obtained governing equations of motion become non-homogeneous. The non-homogeneous governing equations are solved using appropriate analytical methods, and the natural frequencies are extracted. To have a comprehensive research, the effects of various parameters such as the length and radius of the nanorod, the crack severity, the crack position, the type of boundary condition, and the values of surface and bulk material properties on axial frequencies of the nanorod are investigated. Since this work considers the effects of all surface energy parameters, it can be claimed that it is a comprehensive study in this regard. تفاصيل المقالة

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6 - Structural, Optical and Ultra-Violet Photodetection Properties of ZnO Nanorods with Various Aspect Ratios
Saeed Safa Elham Hasani Majid Zareh

ZnO nanorods with various lengths were synthesized by a two-stage route (by changing the time of growth between 0-240 min) and were characterized using XRD, SEM, UV–Vis and PL techniques. The SEM and XRD results confirmed a fast growth of (0 0 2) plane in the pref أکثر

ZnO nanorods with various lengths were synthesized by a two-stage route (by changing the time of growth between 0-240 min) and were characterized using XRD, SEM, UV–Vis and PL techniques. The SEM and XRD results confirmed a fast growth of (0 0 2) plane in the preferential longitudinal orientation, in contrast to lateral growth and therefore, by increasing the time of hydrothermal growth, nanorods with higher aspect ratios are obtained. Naturally, by increasing the length of nanorods, not only the average transmittance in both near ultraviolet and visible ranges is decreased, but also the PL peaks are red-shifted and extinct. Finally, ultra-violet photodetection of the samples shows that higher active surface area (with respect to the time of growth) is appropriate for photo-induced interactions leading to higher UV-sensitivity. تفاصيل المقالة

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7 - Effect of Titania Colloid Solution Concentration on Hydrophobicity of Well-Aligned TiO2 Nanorods Synthesized via Hydrothermal Method
Farhad karimkhani h. ghayour B. Boka

Among one dimensional nanomaterials, TiO2 nanorods have found important applications in various industries due to optical, photocatalyst and self-cleaning properties. In this research, at first TiO2 nanorods were synthesized on a glass substrate by hydrothermal method. أکثر

Among one dimensional nanomaterials, TiO2 nanorods have found important applications in various industries due to optical, photocatalyst and self-cleaning properties. In this research, at first TiO2 nanorods were synthesized on a glass substrate by hydrothermal method. Then a thin film of TiO2 particles was dip coated (as seed layer) on the substrate. After that, hydrothermal synthesis of TiO2 nanorods with 0.05 and 0.1 mol concentrations was carried out on the seed layer. Morphology and microstructure of the seed layer and nanorods were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). Hydrophobicity of nanorods was studied by contact angle instrument. Results revealed that nanorods synthesized on the glass substrate without seed layer are not aligned at all and have the average diameter of 120 nm, whereas nanorods synthesized on the seed layer are well-aligned with 30nm average diameter. The result obtained from contact angle instrument showed that nanorods synthesized with 0.05mol concentration have larger contact angle (157º), compared to those synthesized with 0.1mol concentration which have 115º contact angle. تفاصيل المقالة

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8 - Influence of Cr dopant on the microstructure and optical properties of ZnO nanorods
Saeed Safa A. Masoudi Nejad

One-dimensional (1D) undoped and Cr doped ZnO nanorods with average length of 1 µm and diameter of 80 nm were synthesized using hydrothermal method where a fast growth of ZnO nanorods on the seed layer was observed. Afterwards, the effects of Cr dopant on structur أکثر

One-dimensional (1D) undoped and Cr doped ZnO nanorods with average length of 1 µm and diameter of 80 nm were synthesized using hydrothermal method where a fast growth of ZnO nanorods on the seed layer was observed. Afterwards, the effects of Cr dopant on structural, surface morphology and optical properties of nanorods were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultra-violet visible (UV-Vis) spectroscopy. The results showed that ZnO has a wurtzite hexagonal structure and that the Cr atoms were well incorporated into the ZnO crystal structure. Moreover, it was found that the Cr atoms could facilitate the preferential growth of nanorods in C-axis. Also, it was concluded from optical properties that doped ZnO nanorods was so appropriate for photocatalytic applications because the optical band gap. For example, the calculated band gap of ZnO nanorod decreased from 3.12 eV for pure ZnO nanorods to about 2.41eV for 3 at. % Cr doped ZnO nanorods which is quite enough to be activated even at visible (550nm) light for photocatalyst aims. تفاصيل المقالة

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9 - Investigating structural, optical and photocatalytic properties of hydrothermally synthesized ZnO nanorod arrays with various aspect ratios
Saeed Safa Ali Khayatian eliza rokhsat Mehrdad Najafi

ZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientatio أکثر

ZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientation and aspect ratio of the nanorod arrays. The optical transmittance of the NR arrays indicated a regular decrement of average transmittance with increasing the aspect ratio of NRs in the visible range. The optical constants (absorption coefficient, extinction coefficient and refractive index) can be account as a function of refractive index were determined. The porous ZnO nanorod with the thickness of &sim; 1560 nm and texture coefficient of 0.96 for (002) plane exhibits the average visible transmittance <60%, refractive index 1.34, packing density 0.26 and lowest optical band gap, was fabricated in the longest time of hydrothermal growth (240 min). As the growth time was increased, the photoluminescence properties was sustained a general weakening tendency and a red-shift of UV-emission peak position. The UV-assisted photocatalytic degradation of 4-Nitrophenol (4-NP) of ZnO NRs were investigated. The considerable photocatalytic performance of ZnO NRs with highest aspect ratio was explained by its porosity and optical characteristics. تفاصيل المقالة

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10 - An illustration of photocatalytic properties of ZnO nanorods array films
A Nekoubin H Ghayour Najafabadi M Nasr Esfahani

ZnO nanorods array films were coated on a glass template through a two-step chemical process. First, a sol-gel spin coating method was used to produce a ZnO seed layer and after that, the ZnO nanorods arrays were grown on it through a low temperature aqueous method. Syn أکثر

ZnO nanorods array films were coated on a glass template through a two-step chemical process. First, a sol-gel spin coating method was used to produce a ZnO seed layer and after that, the ZnO nanorods arrays were grown on it through a low temperature aqueous method. Synthesized films were studied by scanning electron microscope (SEM) and X-ray diffractometer (XRD). X-ray diffraction results showed single crystalline wurtzite with a c-axis preferential (002) orientation. The deposited ZnO layers had c-axis orientation, and showed a sharp X-ray diffraction peak at 2θ=34.40 degrees, corresponding to the (002) of hexagonal ZnO crystal. The SEM images showed vertical orientation of rods, and the diameters of rods were under 100 nm. The photocatalytic degradation of XG6 azo dye in aqueous solutions was examined with a combination of ZnO nanorods array film as a photocatalyst and UV light. Results showed that the films are effective in decolorization of dye. تفاصيل المقالة

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11 - Synthesis of TiO2 nanorods with a microwave assisted solvothermal method and their application as dye-sensitized solar cells
Hossein Rezvani Nikabadi Saeed Khosroababdi

10.22034/jna.2019.1877392.1157

In this work, Titanium dioxide (TiO2) nanostructures have been synthesized via a microwave assisted solvothermal method using titanium tetraisopropoxide (TTIP), polyvinylpyrrolidone (PVP) and Ascorbic Acid (AA) in ethanol. The mole ratio of PVP/AA was found to be critic أکثر

In this work, Titanium dioxide (TiO2) nanostructures have been synthesized via a microwave assisted solvothermal method using titanium tetraisopropoxide (TTIP), polyvinylpyrrolidone (PVP) and Ascorbic Acid (AA) in ethanol. The mole ratio of PVP/AA was found to be critical in determining the morphology and crystal phase of the final product. PVP/AA mole ratio was varied from 1 up to 15 to obtain different morphologies of TiO2. The structural analysis by XRD diffraction confirmed formation of titanium dioxide. The Williamson-Hall (W-H) analysis was used to study the individual contributions of crystallite sizes and lattice strain on the peak broadening of the TiO2 nanoparticles. FTIR spectrum was used to estimate the various functional groups present in the nanostructures. Scanning electron microscope (SEM) images demonstrated nanoparticle, short nanorod, and long nanorods for 5, 10 and 15 mole ratio of PVP/AA respectively. TiO2 nanoparticles and nanorods have been used as photoelectrode in dye-synthesized solar cell (DSSCs) fabrication. The efficiencies of solar cells were calculated 3.23% and 4.01% for nanoparticles and nanorods, respectively. تفاصيل المقالة

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12 - Synthesis of TiO2 nanorods with a microwave assisted solvothermal method and their application as dye-sensitized solar cells
Hossein Rezvani Nikabadi Saeed Khosroababdi

10.22034/jna.2020.675050

Inthiswork, Titanium dioxide (TiO2) nanostructures have beensynthesized via amicrowave assisted solvothermalmethod using titanium tetraisopropoxide (TTIP),polyvinylpyrrolidone(PVP) and Ascorbic Acid (AA) in ethanol. The mole ratio ofPVP/AA was found to be critical in de أکثر

Inthiswork, Titanium dioxide (TiO2) nanostructures have beensynthesized via amicrowave assisted solvothermalmethod using titanium tetraisopropoxide (TTIP),polyvinylpyrrolidone(PVP) and Ascorbic Acid (AA) in ethanol. The mole ratio ofPVP/AA was found to be critical in determining the morphology and crystal phaseof the final product. PVP/AA mole ratio varied from 1 up to 15 to obtain differentmorphologies of TiO2. The structural analysis by XRD diffraction confirmedformation of titanium dioxide. The Williamson-Hall (W-H) analysis was usedto study the individual contributionsofcrystallite sizes and lattice strain on thepeak broadening of the TiO2 nanoparticles.FTIR spectrum was used to estimatethe various functional groups present in the nanostructures. Scanning electronmicroscope (SEM) images demonstrate nanoparticle, short nanorod, and longnanorods for 5,10 and 15 mole ratio of PVP/AA respectively. TiO2 nanoparticlesand nanorodshave been used as photoelectrode in dye-synthesized solar cell(DSSCs) fabrication. The efficiencies of solar cells were calculated 3.23%and4.01% for nanoparticles and nanorods, respectively. تفاصيل المقالة

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13 - Preparation and Characterization of Novel Bionanocomposite Based on Tapioca Starch/Gelatin/Nanorod-rich ZnO: Towards Finding Antimicrobial Coating for Nuts
M. M. Marvizadeh A. Mohammadi Nafchi M. Jokar

10.22034/jon.2014.515688

The effects of zinc oxide nanorod on the barrier, sorption isotherm and antibacterial properties of tapioca starch/bovine gelatin Bionanocomposite films were investigated. The nanorod-rich ZnO (ZnO-N) was homogenized by sonication and incorporated into tapioca starch/bo أکثر

The effects of zinc oxide nanorod on the barrier, sorption isotherm and antibacterial properties of tapioca starch/bovine gelatin Bionanocomposite films were investigated. The nanorod-rich ZnO (ZnO-N) was homogenized by sonication and incorporated into tapioca starch/bovine gelatin solutions at different concentrations (e.g. 0.5, 2, and 3.5% w/w dried solid). Incorporation of 3.5% of nanoparticles into tapioca starch/bovin gelatin films decreased the permeability to water vapor by 18%. The addition of low concentration ZnO-N to starch/gelatin solutions significantly decreased monolayer water content of the films. ZnO-N tapioca starch/bovin gelatin films exhibited excellent anti-microbial activity against Staphylococcus aureus and Escherichia coli. The results showed that the Bionanocomposite of ZnO-N has the potential to be an active packaging material in the pharmaceutical and food industries. تفاصيل المقالة

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14 - Improved Physicochemical Properties of Tapioca Starch / Bovine Gelatin Biodegradable Films with Zinc Oxide Nanorod
Mohammad Mehdi Marvizadeh Abdorreza Mohammadi Nafchi Maryam Jokar

10.22034/jchr.2018.544081

The effects of zinc oxide nanorod (ZnO-N) incorporation on thephysicochemical properties of tapioca starch / bovin gelatin composite film such as water absorption capacity (WÐC), water solubility and permeability to water vapour (WVP) were investigated. In this search, أکثر

The effects of zinc oxide nanorod (ZnO-N) incorporation on thephysicochemical properties of tapioca starch / bovin gelatin composite film such as water absorption capacity (WÐC), water solubility and permeability to water vapour (WVP) were investigated. In this search, ZnO-N was homogenized by sonication and added into tapioca starch / bovine gelÐ°tin dispersions Ð°t different concentrations (e.g. 0.5, 2, and 3.5% w/w total solid). Incorporation of 3.5% of nanoparticles to tapioca starch / bovine gelatin films decreased the permeability to water vapor by 18%. Water absorption capacity and Solubility of the films were decreased by increasing the ZnO-N contents. These properties suggest that ZnO-N has the potential as filler in starch /gelatin-based films for using in pharmaceutical and food packaging industries تفاصيل المقالة

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15 - The Effects of ZnOnanorodson the Characteristics of Sago Starch Biodegradable Films
R. Alebooyeh A. MohammadiNafchi M. Jokr

10.22034/jchr.2018.544007

: Nowadays tend to use biodegradable packaging; including edible coatings and films for free from synthetic chemicals and do not cause environmental pollution, the industry is growing day by day. The aim of this research was to preparation and characterization of biodeg أکثر

: Nowadays tend to use biodegradable packaging; including edible coatings and films for free from synthetic chemicals and do not cause environmental pollution, the industry is growing day by day. The aim of this research was to preparation and characterization of biodegradable films supported with ZnOnanorods. In this study, sago starch based films were prepared andÂ Â plasticized with sorbitol/ glycerol by casting method. ZnOnanorod with 0, 1, 3and 5%(w/w)was added to the films before casting the films. Films were dried at controlled conditions. Physicochemical properties such as water absorption capacity (WAC), permeability to water vapor (WVP) and water solubility of the films were measured.Â Also, the effects of addition of nano particles were measured on the antimicrobial properties of the films by agar diffusion method. Results showed that by increasing concentration of ZnOnanorod, solubility in water, WAC, and WVP of the films significantly (p <0.05) decreased. Furthermore, the addition of zinc oxide nanorods showed antimicrobial properties against E. Coli. In summary sago starch films supported with ZnOnanorodscan were used as active packaging for agricultural products as well as food industry.Â تفاصيل المقالة

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16 - High-Barrier and Light–protective Bionanocomposite Film Based on Rye Starch/nanorod-ZnO for Food Packaging Applications
Neda Fallah Mohammad Mehdi Marvizadeh Reihaneh Jahangiri Azam Zeinalzadeh Abdorreza Mohammadi Nafchi

10.22034/jchr.2022.1963330.1587

Improving food quality, nutritional value and biodegradability are the reasons for developing edible films. Fine-dispersed starch-based nanobiocomposites were provided by adding nanorod-ZnO as fillers to aqueous starch. In this work, the impact of ZnO nanorod (ZnO-N) fi أکثر

Improving food quality, nutritional value and biodegradability are the reasons for developing edible films. Fine-dispersed starch-based nanobiocomposites were provided by adding nanorod-ZnO as fillers to aqueous starch. In this work, the impact of ZnO nanorod (ZnO-N) filler on the barrier properties and UV transmission of biofilms based on rye starch was studied.The solutions containing nanoadditives were homogenized by ultrasound waves and embedded in rye starch at various levels(1 - 5% w/w dried solid). Starch films were prepared by casting method with nanoparticles and plasticizers. Biofilms containing 5% ZnO-N had 0% UV transmittance. Active films were able to absorb Near Infrared spectra. After applying ZnO-N to the bionanocomposite film no new bond has emerged. Regarding barrier characterization,rye starch film with 5% ZnO-N showed better barrier properties than neat films, mainly by the gravimetricmethod,starch films containing 5% ZnO-N andcontrol samples were 1.6±0.02 and 1.18±0.01g/mPah, respectively. تفاصيل المقالة

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17 - پوشش نانو سیم‌های اکسید روی بر روی الکترود آرایه های درهمتنیده طلا و بررسی عملکرد نانو حسگر گازهای الکلی
حمید غیور امین نکوبین امیرعباس نوربخش

الکترود آرایه‌های درهمتنیده با استفاده از نانولیتوگرافی طلا بر روی بستر آلومینایی با روش PVD ساخته شد.از نانو میله ‌اکسید روی به عنوان ماده حسگر استفاده شده که به روش هیدروترمال بر روی بذر لایه ای از اکسید روی سنتز شد. نانومیله‌های سنتز شده با استفاده از تفرق پرتو ایکس‌ أکثر

الکترود آرایه‌های درهمتنیده با استفاده از نانولیتوگرافی طلا بر روی بستر آلومینایی با روش PVD ساخته شد.از نانو میله ‌اکسید روی به عنوان ماده حسگر استفاده شده که به روش هیدروترمال بر روی بذر لایه ای از اکسید روی سنتز شد. نانومیله‌های سنتز شده با استفاده از تفرق پرتو ایکس‌(XRD)، میکروسکوپ الکترونی عبوری با تفکیک بالا(HR-TEM) ، میکروسکوپ الکترونی روبشی (SEM) و میکروسکوپ نیروی اتمی (AFM)مشخصه یابی گردید. عملکرد حسگری برای چهار گاز الکلی بررسی شد.به منظور بهینه کردن شرایط حسگری حساسیت و پاسخ نانومیله های اکسید روی در گستره دمایی 50 تا 300 درجه سانتیگراد بررسی شد. دمای کاری 47 درجه ساتیگراد به عنوان دمای بهینه انتخاب گردید و متغیرهای مهمی همچون حساسیت حسگر،زمان پاسخ دهی و زمان بازیابی برای چهار گاز در دمای ثابت و برای غلظتهای مختلف به دست آمد. نتایج حاصل نشان داد که با استفاده از نانومیله های همراستای اکسید روی؛ گازهای الکلی در دمای پایین با حساسیت بالا قابل تشخیص هستند. تفاصيل المقالة

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18 - سنتز و مشخصه یابی نانومیله های نقره و مس و بررسی هدایت حرارتی نانوسیال حاوی نانومیله‌های سنتزشده
صدیقه عباسی فرید نوری وطن

هدف این تحقیق, سنتز و مشخصه‌یابی نانومیله‌های مس و نقره و همچنین بررسی تغییرات میزان هدایت حرارتی نانوسیال‌های حاوی نانومیله‌های سنتز شده و آب می‌باشد. بدین منظور از AgNO3 و CuCl2 به عنوان پیش‌ساز نانومیله‌های نقره و مس استفاده گردید. فاز کریستالی نانومیله-های سنتز شده أکثر

هدف این تحقیق, سنتز و مشخصه‌یابی نانومیله‌های مس و نقره و همچنین بررسی تغییرات میزان هدایت حرارتی نانوسیال‌های حاوی نانومیله‌های سنتز شده و آب می‌باشد. بدین منظور از AgNO3 و CuCl2 به عنوان پیش‌ساز نانومیله‌های نقره و مس استفاده گردید. فاز کریستالی نانومیله-های سنتز شده با استفاده از طیف XRD مورد آنالیز قرار گرفت. ارزیابی میکروسکوپ الکترونی عبوری (TEM) جهت بررسی مورفولوژی نانومیله‌های سنتز شده مورد استفاده قرار گرفت. نتایج حاصل از طیف XRD نشان داد که نانومیله‌های نقره ومس دارای ساختار کریستالی مکعبی می‌باشند. با توجه به نتایج حاصل از تصاویر TEM مشاهده شد که روش هیدروترمال سبب سنتز نقره و مس با مورفولوژی میله‌ای شکل می‌شود. نتایج حاصل از بررسی میزان هدایت حرارتی نانوسیال‌ها نشان داد که با افزایش دما در محدوده 20 تا °C60 و غلظت از 0.25 تا 0.5 درصد وزنی، میزان هدایت حرارتی نیز افزایش می‌یابد. نتایج حاصل از میزان هدایت حرارتی نشان داد کمترین و بیشترین میزان هدایت حرارتی نانوسیال حاوی نانومیله‌های نقره به ترتیب برابر W/m.K 0.56 و W/m.K 2.93 و در نانوسیال حاوی نانومیله‌های مس به ترتیب برابر W/m.K 033 و W/m.K 2.74 می‌باشد. همچنین نتایج حاصل نشان داد که میزان هدایت حرارتی نانوسیال حاوی نانومیله‌های نقره بیشتر از میزان هدایت حرارتی نانوسیال مس می‌باشد. تفاصيل المقالة

حرية الوصول المقاله

19 - سنتز و مشخصه‌یابی نانومیله های Fe2O3/BaFe12O19 و بررسی خواص مغناطیسی آنها
محمد جزیره پور هرمزی محمد حسین شمس

در این مقاله نانومیله‌های Fe2O3/BaFe12O19 با استفاده از یک فرآیند هیدروترمال ساده و ارزان با قابلیت تولید انبوه سنتز شده است. ویژگی‌های مورفولوژیک نانومیله‌ها نظیر طول، قطر و نسبت ابعادی در این فرآیند قابل‌کنترل است. EDTA در این فرآیند به‌عنوان عامل کنترل‌کننده رشد ‌است أکثر

در این مقاله نانومیله‌های Fe2O3/BaFe12O19 با استفاده از یک فرآیند هیدروترمال ساده و ارزان با قابلیت تولید انبوه سنتز شده است. ویژگی‌های مورفولوژیک نانومیله‌ها نظیر طول، قطر و نسبت ابعادی در این فرآیند قابل‌کنترل است. EDTA در این فرآیند به‌عنوان عامل کنترل‌کننده رشد ‌استفاده‌ شده است. در این پژوهش تأثیر عوامل مختلفی نظیر دمای فرآوری هیدروترمال (115، 150 و 180 درجه سانتیگراد)، زمان فرآوری هیدروترمال (5، 10 و 40 ساعت)، نوع عامل کنترل‌کننده رشد (EDTA، PEG400، PEG6000، CA) و نوع عامل قلیایی (NaOH و NH3) بررسی گردید. در شرایط مختلف اشکال گوناگون نظیر کره‌هایی با ابعاد 50 تا 100 نانومتر، نانومیله‌هایی با قطرهای 50 تا 400 نانومتر و طول‌های 1 تا 10 میکرون سنتز شد. مشخصات مورفولوژی نمونه‌ها توسط میکروسکوپ الکترونی روبشی (SEM)و خواص مغناطیسی نمونه‌ها با استفاده از مغناطش سنج با گرادیان نیروی متناوب (AGFM) مورد مطالعه قرار گرفت. نانومیله‌های مورد بررسی در این تحقیق در موضوعاتی نظیر حذف یون‌های فلزات سنگین از پساب‌ها، کاتالیست‌ها، سلول‌های خورشیدی و مواد جاذب امواج مایکروویو قابل کاربرد هستند. تفاصيل المقالة

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