Pub Date : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609258
G. Apoorva, K. Lavanya, Vidisha, Pavani, R. R. Kumar, Q. Hasan, D. Ramakrishna
We investigated the genotoxic effects of 10-20 nm silver (Ag) and Titanium dioxide (TiO2) nanoparticles (NPs) by evaluating chromosome aberrations and polyploidy status and micronucleus (MN) assay. Methods Before testing, we confirmed that the Ag-NPs were completely dispersed in the experimental medium by sonication (three times in 1 minute) and filtration (0.2 μm pore size filter), and then we measured their size in a zeta potential analyzer. After that the genotoxicity was measured. Results After incubation with the defined concentration and size of the Silver and TiO2 nanoparticles, 100 metaphases were analyzed under microscope, 9%, 12% structural aberrations and 3%, 2% numerical aberrations were observed respectively. There was no aberration found in the control sample. After incubation with the defined concentration and size of the Ag & TiO2 nanoparticles, 1000 bi-nucleated cells were analyzed under microscope, 3% and 1% of these cells were observed with micronuclei respectively.Conclusions All of our findings indicate that Ag-and TiO2 NPs show genotoxic effects in mammalian cell system. In addition, present study suggests that the genotoxicity effect of Ag and TiO2 nanoparticles is concentration and size dependent.
{"title":"Genotoxic effects of silver and Titanium dioxide nanoparticles","authors":"G. Apoorva, K. Lavanya, Vidisha, Pavani, R. R. Kumar, Q. Hasan, D. Ramakrishna","doi":"10.1109/ICANMEET.2013.6609258","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609258","url":null,"abstract":"We investigated the genotoxic effects of 10-20 nm silver (Ag) and Titanium dioxide (TiO2) nanoparticles (NPs) by evaluating chromosome aberrations and polyploidy status and micronucleus (MN) assay. Methods Before testing, we confirmed that the Ag-NPs were completely dispersed in the experimental medium by sonication (three times in 1 minute) and filtration (0.2 μm pore size filter), and then we measured their size in a zeta potential analyzer. After that the genotoxicity was measured. Results After incubation with the defined concentration and size of the Silver and TiO2 nanoparticles, 100 metaphases were analyzed under microscope, 9%, 12% structural aberrations and 3%, 2% numerical aberrations were observed respectively. There was no aberration found in the control sample. After incubation with the defined concentration and size of the Ag & TiO2 nanoparticles, 1000 bi-nucleated cells were analyzed under microscope, 3% and 1% of these cells were observed with micronuclei respectively.Conclusions All of our findings indicate that Ag-and TiO2 NPs show genotoxic effects in mammalian cell system. In addition, present study suggests that the genotoxicity effect of Ag and TiO2 nanoparticles is concentration and size dependent.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"13 1","pages":"133-136"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90090790","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609322
J. P. Devadhasan, Sanghyo Kim
Complementary metal oxide semiconductor (CMOS) technology has an emerging filed in molecular diagnostics and other biological applications. The present study demonstrated that CMOS image sensor based glucose monitoring in mouse plasma by simple photon number changes. The photon number varied in the basis of color differences of oxidized glucose in polydimethylsiloxane (PDMS) chip. The high concentration of glucose produces more color and was allowed to pass less number of photons; the photon numbers are gradually increased with less concentration of glucose. Number of photons are depends on the density of color in mouse glucose. The photons are captured and converted as a digital numbers. The UV-spectral study helps to confirmed that the CMOS image sensor is a precise detection system for glucose measurement by point-of-care approach.
{"title":"CMOS image sensor for measurement of glucose in mouse plasma","authors":"J. P. Devadhasan, Sanghyo Kim","doi":"10.1109/ICANMEET.2013.6609322","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609322","url":null,"abstract":"Complementary metal oxide semiconductor (CMOS) technology has an emerging filed in molecular diagnostics and other biological applications. The present study demonstrated that CMOS image sensor based glucose monitoring in mouse plasma by simple photon number changes. The photon number varied in the basis of color differences of oxidized glucose in polydimethylsiloxane (PDMS) chip. The high concentration of glucose produces more color and was allowed to pass less number of photons; the photon numbers are gradually increased with less concentration of glucose. Number of photons are depends on the density of color in mouse glucose. The photons are captured and converted as a digital numbers. The UV-spectral study helps to confirmed that the CMOS image sensor is a precise detection system for glucose measurement by point-of-care approach.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"18 1","pages":"371-375"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83661574","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609241
P. Yuvasree, K. Nithya, N. Neelakandeswari
Aloe vera is a stem less or very shortstemmed succulent plant growing to 60-100 cm (24-39 in) tall, spreading by offsets. The leaves are thick and fleshy, green to grey-green, with some varieties showing white flecks on the upper and lower stem surfaces. In recent years, researchers in the field of nanotechnology are finding that metal nanoparticles have all kinds of previously unexpected benefits.A new branch of nanotechnology is nanobiotechnology. Nanobiotechnology represents an economic alternative for chemical and physical methods of nanoparticles formation. When compare to physical and chemical methods biological methods have emerged as an alternative to the conventional methods for synthesis of NPs. Synthesis of inorganic nanoparticles by biological systems makes nanoparticles more biocompatible and environmentally benign. Many bacterial as well as fungal species have been used for silver nanoparticles synthesis. But most of them have been reported to accumulate silver nanoparticles intracellularly. Intracellular synthesis always takes longer reaction times and also demands subsequent extraction and recovery steps. On the contrary, plant extract mediated synthesis always takes place extracellularly, and the reaction times have also been reported to be very short compared to that of microbial synthesis. In the present study young fresh plant stems were collected and the inner green flesh was used for the synthesis of silver nanoparticles. 20 mL of aqueous extract was added to 20 mL of 1mM silver nitrate solution. The solution was allowed to react at room temperature and incubated in dark condition. After 24hrs the color change was observed and the extract was subjected to UV - Visible studies. Though the plasmon band is broad due to the presence of components in extract which are also being read in the spectrophotometric range, it is observed that the silver surface plasmon resonance (SPR) occurs at 460nm. Here is no change in peak position, suggesting that nucleation of silver nanoparticles starts with initiation of reaction time only, and the size remains unchanged throughout the course of reaction. The antibacterial activity was conducted against E.coli, and Bacillus Species. Bioreduced silver nanoparticles showed considerable growth inhibition of two of the well-known pathogenic bacteria species. Zones of 11 mm and 10 mm were observed for E. coli and Bacillus Species respectively.
芦荟是一种茎少或茎短的多肉植物，生长到60-100厘米(24-39英寸)高，通过offset展开。叶子厚而肉质，绿色到灰绿色，一些品种在茎的上下表面显示白色斑点。近年来，纳米技术领域的研究人员发现，金属纳米颗粒具有各种以前意想不到的优点。纳米技术的一个新分支是纳米生物技术。纳米生物技术代表了化学和物理方法形成纳米颗粒的经济替代方案。与物理和化学方法相比，生物方法已成为合成NPs的传统方法的替代方法。生物系统合成无机纳米粒子使纳米粒子更具生物相容性和环境友好性。许多细菌和真菌物种已被用于银纳米颗粒的合成。但据报道，它们中的大多数在细胞内积聚银纳米粒子。细胞内合成总是需要较长的反应时间，也需要随后的提取和回收步骤。相反，植物提取物介导的合成总是发生在细胞外，与微生物合成相比，反应时间也很短。在本研究中，我们收集了新鲜的植物幼嫩茎，并利用其内部的绿色果肉来合成纳米银。将20 mL水提取物加入20 mL 1mM硝酸银溶液中。溶液在室温下反应，在黑暗条件下孵育。24h后观察颜色变化，并进行紫外可见研究。虽然由于萃取物中存在的组分也在分光光度范围内被读取，等离子体带很宽，但观察到银表面等离子体共振(SPR)发生在460nm处。这里峰的位置没有变化，说明银纳米粒子的成核只从反应时间开始，在整个反应过程中尺寸保持不变。对大肠杆菌和芽孢杆菌进行了抑菌试验。生物还原银纳米颗粒对两种众所周知的致病菌显示出相当大的生长抑制作用。大肠杆菌和芽孢杆菌分别为11 mm和10 mm。
{"title":"Biosynthesis of silver nanoparticles from Aloe vera plant extract and its antimicrobial activity against multidrug resistant pathogens","authors":"P. Yuvasree, K. Nithya, N. Neelakandeswari","doi":"10.1109/ICANMEET.2013.6609241","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609241","url":null,"abstract":"Aloe vera is a stem less or very shortstemmed succulent plant growing to 60-100 cm (24-39 in) tall, spreading by offsets. The leaves are thick and fleshy, green to grey-green, with some varieties showing white flecks on the upper and lower stem surfaces. In recent years, researchers in the field of nanotechnology are finding that metal nanoparticles have all kinds of previously unexpected benefits.A new branch of nanotechnology is nanobiotechnology. Nanobiotechnology represents an economic alternative for chemical and physical methods of nanoparticles formation. When compare to physical and chemical methods biological methods have emerged as an alternative to the conventional methods for synthesis of NPs. Synthesis of inorganic nanoparticles by biological systems makes nanoparticles more biocompatible and environmentally benign. Many bacterial as well as fungal species have been used for silver nanoparticles synthesis. But most of them have been reported to accumulate silver nanoparticles intracellularly. Intracellular synthesis always takes longer reaction times and also demands subsequent extraction and recovery steps. On the contrary, plant extract mediated synthesis always takes place extracellularly, and the reaction times have also been reported to be very short compared to that of microbial synthesis. In the present study young fresh plant stems were collected and the inner green flesh was used for the synthesis of silver nanoparticles. 20 mL of aqueous extract was added to 20 mL of 1mM silver nitrate solution. The solution was allowed to react at room temperature and incubated in dark condition. After 24hrs the color change was observed and the extract was subjected to UV - Visible studies. Though the plasmon band is broad due to the presence of components in extract which are also being read in the spectrophotometric range, it is observed that the silver surface plasmon resonance (SPR) occurs at 460nm. Here is no change in peak position, suggesting that nucleation of silver nanoparticles starts with initiation of reaction time only, and the size remains unchanged throughout the course of reaction. The antibacterial activity was conducted against E.coli, and Bacillus Species. Bioreduced silver nanoparticles showed considerable growth inhibition of two of the well-known pathogenic bacteria species. Zones of 11 mm and 10 mm were observed for E. coli and Bacillus Species respectively.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"2012 1","pages":"84-86"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86408052","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609391
M. Agarwal, U. Singh, R. Dusane, Ankur Soam
In photovoltaic technology, texturing of base wafer has great importance since it reduces the reflectance of incident light that leads to improvement in the conversion efficiency. Due to different orientations present in polycrystalline silicon wafer an isotropic etching and the texturing without grain boundary delineation is great challenge. In this study, an attempt has been made to get isotropic etching by acidic solution. The volume ratios of HF/HNO3/ CH3COOH have been chosen in such a way that it fell in lower part of iso-etch curve where the solution is HNO3 rich. The presence of high concentration of HNO3 leads to the rapid oxidation of silicon surface and hence makes the etching rate limited through the diffusion of HF into the SiO2. This study shows the isotropic etching of poly-Si wafer which is confirmed by scanning electron microscopy. Moreover, the reflectance measurements show that the average reflectance reduces from 20.5 to 8.5 % over 350 to 800 nm range.
{"title":"Isotropic etching of polycrystalline silicon wafer by acidic solution","authors":"M. Agarwal, U. Singh, R. Dusane, Ankur Soam","doi":"10.1109/ICANMEET.2013.6609391","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609391","url":null,"abstract":"In photovoltaic technology, texturing of base wafer has great importance since it reduces the reflectance of incident light that leads to improvement in the conversion efficiency. Due to different orientations present in polycrystalline silicon wafer an isotropic etching and the texturing without grain boundary delineation is great challenge. In this study, an attempt has been made to get isotropic etching by acidic solution. The volume ratios of HF/HNO3/ CH3COOH have been chosen in such a way that it fell in lower part of iso-etch curve where the solution is HNO3 rich. The presence of high concentration of HNO3 leads to the rapid oxidation of silicon surface and hence makes the etching rate limited through the diffusion of HF into the SiO2. This study shows the isotropic etching of poly-Si wafer which is confirmed by scanning electron microscopy. Moreover, the reflectance measurements show that the average reflectance reduces from 20.5 to 8.5 % over 350 to 800 nm range.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"36 1","pages":"689-691"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83528681","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609335
R. Bharathi, A. Umarji
Solution combustion synthesis technique was adopted to synthesize V2O5, and Mo doped phases, The assynthesized V2O5, has been reduced by a novel reduction technique to form VO2 typephase. The monophasic nature of the samples as revealed by XRD data and systematic shift in peak position indicated solid solubility up to 2 at % of Mo in VO2 lattice. The crystallite size was found to ~ 40 nm. Particle size measurement carried out using Transmission electron microscope (TEM)agreed with XRD experiments. Scanning electron microscope revealed the morphology of the particles to be plate like and bimodal. Variation in the metal-insulator transition temperature as a function of doping was investigated by 4-probe electrical resistivity measurement on sintered ceramics.
{"title":"Effect of Mo doping on the electrical properties of VO2 phase","authors":"R. Bharathi, A. Umarji","doi":"10.1109/ICANMEET.2013.6609335","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609335","url":null,"abstract":"Solution combustion synthesis technique was adopted to synthesize V2O5, and Mo doped phases, The assynthesized V2O5, has been reduced by a novel reduction technique to form VO2 typephase. The monophasic nature of the samples as revealed by XRD data and systematic shift in peak position indicated solid solubility up to 2 at % of Mo in VO2 lattice. The crystallite size was found to ~ 40 nm. Particle size measurement carried out using Transmission electron microscope (TEM)agreed with XRD experiments. Scanning electron microscope revealed the morphology of the particles to be plate like and bimodal. Variation in the metal-insulator transition temperature as a function of doping was investigated by 4-probe electrical resistivity measurement on sintered ceramics.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"33 1","pages":"424-425"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91204225","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609376
Greeni Navin, T. Basavaraj
As the world is on lookout for the smarter and faster and energy efficient technology, CNTFETs are considered as one of the emerging elements of nanotechnology for future logic applications, with high figures for mobility, achievable current density thereby creating high performance systems on chip with lower cost. CNTFETs are promising devices but what makes it difficult to model a CNT is that nanotubes have a very broad range of electronic, thermal, and structural properties that change depending on parameters defined by its diameter, length, gate parameters and chirality or twist. In this paper various device parameters are discussed which can affect the switching and storing of data in the CNTFET memory cells. Hysteresis was clearly observed in the curve of the drain current versus gate voltage, which makes the CNTFET possible for a nonvolatile memory cell. In this paper the various parameters which can affect the performance of CNT as memory cell has been discussed.
{"title":"Factors affecting performance of CNT FET as a switch in memory cell","authors":"Greeni Navin, T. Basavaraj","doi":"10.1109/ICANMEET.2013.6609376","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609376","url":null,"abstract":"As the world is on lookout for the smarter and faster and energy efficient technology, CNTFETs are considered as one of the emerging elements of nanotechnology for future logic applications, with high figures for mobility, achievable current density thereby creating high performance systems on chip with lower cost. CNTFETs are promising devices but what makes it difficult to model a CNT is that nanotubes have a very broad range of electronic, thermal, and structural properties that change depending on parameters defined by its diameter, length, gate parameters and chirality or twist. In this paper various device parameters are discussed which can affect the switching and storing of data in the CNTFET memory cells. Hysteresis was clearly observed in the curve of the drain current versus gate voltage, which makes the CNTFET possible for a nonvolatile memory cell. In this paper the various parameters which can affect the performance of CNT as memory cell has been discussed.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"24 1","pages":"655-657"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85627101","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609312
A. Anil, Ronak B. Shah, S. N. Misra
In this study, sol-gel based ZrO2 nano coating was made on the surface of glazed ceramic tile by spin coating. Further, various surface characteristics were studied after curing at 550°C, 650°C and 700°C, 750°C and 800°C. FTIR, DTA/TG of the gel powder and XRD of calcined gel powder were carried out. The surface of the coating has been characterised using optical microscope and SEM. Properties of coated glazed surfaces such as gloss, colour difference, wetting characteristics and stain resistance were evaluated. Chemical resistance studies (both acid and alkali) of ceramic tiles were also carried out. Experimental results showed that gloss and contact angle of water on the surface of the coated samples significantly increased compared to uncoated substrate. Coated substrates cured at all temperatures exhibited good acid resistance. It has also observed that curing temperature has a strong influence on alkali resistance and coated substrate cured at 650°C and 700°C showed superior alkali resistance than uncoated substrate. In this paper, an effort has been made to explore and validate the potential application of ZrO2 nano coating on the glazed ceramic wall tiles w.r.t improved gloss, hydrophobic properties and chemical resistance.
{"title":"Studies on surface characteristics and chemical resistance of zirconia nano coating developed on glazed ceramic wall tiles","authors":"A. Anil, Ronak B. Shah, S. N. Misra","doi":"10.1109/ICANMEET.2013.6609312","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609312","url":null,"abstract":"In this study, sol-gel based ZrO2 nano coating was made on the surface of glazed ceramic tile by spin coating. Further, various surface characteristics were studied after curing at 550°C, 650°C and 700°C, 750°C and 800°C. FTIR, DTA/TG of the gel powder and XRD of calcined gel powder were carried out. The surface of the coating has been characterised using optical microscope and SEM. Properties of coated glazed surfaces such as gloss, colour difference, wetting characteristics and stain resistance were evaluated. Chemical resistance studies (both acid and alkali) of ceramic tiles were also carried out. Experimental results showed that gloss and contact angle of water on the surface of the coated samples significantly increased compared to uncoated substrate. Coated substrates cured at all temperatures exhibited good acid resistance. It has also observed that curing temperature has a strong influence on alkali resistance and coated substrate cured at 650°C and 700°C showed superior alkali resistance than uncoated substrate. In this paper, an effort has been made to explore and validate the potential application of ZrO2 nano coating on the glazed ceramic wall tiles w.r.t improved gloss, hydrophobic properties and chemical resistance.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"247 1","pages":"344-349"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75806489","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609302
S. Nishanthi, S. Iyyapushpam, Pathinettam Padiyan
The effect of water content in anodization of Ti foil on photoelectrochemical activity of TiO2 nanotubes fabricated were studied and optimized. The mixed phase of TiO2 was confirmed from X-ray diffraction and their morphological changes with respect to increase in water content were analyzed using High Resolution Scanning Electron Microscope. The optical band gap of TiO2 can be effectively tuned from 3.023(2) to 2.601(7) eV by varying the water content in anodization. The maximum photocurrent density of 2.5 mA/cm2 was observed for the TiO2 sample with higher crystallinity. These results suggest that the higher crystallinity with ordered nanotubes and lesser band gap act as a key role in improving the photoelectrochemical activity of TiO2.
{"title":"Role of water content in anodization of titanium to fabricate TiO2 nanotubes and its properties","authors":"S. Nishanthi, S. Iyyapushpam, Pathinettam Padiyan","doi":"10.1109/ICANMEET.2013.6609302","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609302","url":null,"abstract":"The effect of water content in anodization of Ti foil on photoelectrochemical activity of TiO2 nanotubes fabricated were studied and optimized. The mixed phase of TiO2 was confirmed from X-ray diffraction and their morphological changes with respect to increase in water content were analyzed using High Resolution Scanning Electron Microscope. The optical band gap of TiO2 can be effectively tuned from 3.023(2) to 2.601(7) eV by varying the water content in anodization. The maximum photocurrent density of 2.5 mA/cm2 was observed for the TiO2 sample with higher crystallinity. These results suggest that the higher crystallinity with ordered nanotubes and lesser band gap act as a key role in improving the photoelectrochemical activity of TiO2.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"43 1","pages":"320-323"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75314937","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609362
B. Pranav, B. Kumar, T. Vetrichelvan, P. D. Raj, M. Venkatesan, M. Sridharan
This paper describes a two phase flow sensor using copper (Cu) thin film electrodes. A two phase flow constitutes a simultaneous flow of two different phases. To identify these phases in an air-water flow in a small diameter tube, Cu films were coated on to glass substrate at various substrate temperatures using dc magnetron sputtering technique. The films were characterized for their structural, morphological and electrical properties using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM) and resistance/capacitance measurement by LCR-Z meter. The grain size of the films increased with increase in the substrate temperature, which in turn reduced the defects. Due to this the resistance of the films decreased. The fabricated capacitor using the Cu film, exhibited different capacitance values with respect to the flow of fluid in the capillary tube.
{"title":"Thin film capacitor for void fraction measurement in a two-phase system","authors":"B. Pranav, B. Kumar, T. Vetrichelvan, P. D. Raj, M. Venkatesan, M. Sridharan","doi":"10.1109/ICANMEET.2013.6609362","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609362","url":null,"abstract":"This paper describes a two phase flow sensor using copper (Cu) thin film electrodes. A two phase flow constitutes a simultaneous flow of two different phases. To identify these phases in an air-water flow in a small diameter tube, Cu films were coated on to glass substrate at various substrate temperatures using dc magnetron sputtering technique. The films were characterized for their structural, morphological and electrical properties using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM) and resistance/capacitance measurement by LCR-Z meter. The grain size of the films increased with increase in the substrate temperature, which in turn reduced the defects. Due to this the resistance of the films decreased. The fabricated capacitor using the Cu film, exhibited different capacitance values with respect to the flow of fluid in the capillary tube.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"1 1","pages":"554-556"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76008306","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 : 2013-07-24DOI: 10.1109/ICANMEET.2013.6609368
S. Katlakunta, S. Meena, R. S. Shinde, S. Murthy
Nanocrystalline SrFe12O19 has been prepared by microwave hydrothermal method at 473 K/90 min, subsequently annealed at different temperatures using microwaves (2.45GHz). The average particle size of the powders was found to be 48 nm. The plate shape grains were observed in FE-SEM at 1073 K. The crystals exhibited the typical hexagonal ferrite growth habit with a plate-like geometry. The effects of microwave sintering temperature on crystallinity, morphology and magnetic properties have been investigated. The grain sizes of sintered hexaferrites are in the range of 250 to 890 nm. The value of Ms = 58 kA/m and Hc = 125 kA/m was obtained at 1173 K/1h.
{"title":"Effect of microwave sintering on structural and magnetic properties of SrFe12O19 nanopowders","authors":"S. Katlakunta, S. Meena, R. S. Shinde, S. Murthy","doi":"10.1109/ICANMEET.2013.6609368","DOIUrl":"https://doi.org/10.1109/ICANMEET.2013.6609368","url":null,"abstract":"Nanocrystalline SrFe12O19 has been prepared by microwave hydrothermal method at 473 K/90 min, subsequently annealed at different temperatures using microwaves (2.45GHz). The average particle size of the powders was found to be 48 nm. The plate shape grains were observed in FE-SEM at 1073 K. The crystals exhibited the typical hexagonal ferrite growth habit with a plate-like geometry. The effects of microwave sintering temperature on crystallinity, morphology and magnetic properties have been investigated. The grain sizes of sintered hexaferrites are in the range of 250 to 890 nm. The value of Ms = 58 kA/m and Hc = 125 kA/m was obtained at 1173 K/1h.","PeriodicalId":13708,"journal":{"name":"International Conference on Advanced Nanomaterials & Emerging Engineering Technologies","volume":"34 1","pages":"572-575"},"PeriodicalIF":0.0,"publicationDate":"2013-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91032648","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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