Pub Date : 2012-06-15DOI: 10.1080/19430892.2012.678757
T. Sharma, M. Sapra, Aradhana Chopra, Rekha Sharma, Supriya Deepak Patil, R. Malik, R. Pathania, N. Navani
ABSTRACT With the emergence of multiple-drug-resistant pathogens, the antibacterial property of silver in colloidal form has emerged as a potential candidate for combating infectious diseases. A combination of antibacterial agents along with nanosilver could prove to be more potent due to broadened antibacterial spectrum with possibly lower doses. In the present study, a facile single-step green method of synthesizing silver nanoparticles functionalized with an antibacterial peptide from a food-grade lactic acid bacterium is reported. The synthesized enterocin-coated silver nanoparticles showed broad-spectrum inhibition against a battery of food-borne pathogenic bacteria without any detectable toxicity to red blood cells. The present results evince that a new category of biocide based on silver nanoparticles coated with food-grade antibacterials can be developed using simple methods.
{"title":"Interaction of Bacteriocin-Capped Silver Nanoparticles with Food Pathogens and Their Antibacterial Effect","authors":"T. Sharma, M. Sapra, Aradhana Chopra, Rekha Sharma, Supriya Deepak Patil, R. Malik, R. Pathania, N. Navani","doi":"10.1080/19430892.2012.678757","DOIUrl":"https://doi.org/10.1080/19430892.2012.678757","url":null,"abstract":"ABSTRACT With the emergence of multiple-drug-resistant pathogens, the antibacterial property of silver in colloidal form has emerged as a potential candidate for combating infectious diseases. A combination of antibacterial agents along with nanosilver could prove to be more potent due to broadened antibacterial spectrum with possibly lower doses. In the present study, a facile single-step green method of synthesizing silver nanoparticles functionalized with an antibacterial peptide from a food-grade lactic acid bacterium is reported. The synthesized enterocin-coated silver nanoparticles showed broad-spectrum inhibition against a battery of food-borne pathogenic bacteria without any detectable toxicity to red blood cells. The present results evince that a new category of biocide based on silver nanoparticles coated with food-grade antibacterials can be developed using simple methods.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"25 1","pages":"93-110"},"PeriodicalIF":0.0,"publicationDate":"2012-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85612597","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 : 2012-03-20DOI: 10.1080/19430892.2012.654742
B. Yadav, Rama Singh, Satyendra Singh, P. Dwivedi
ABSTRACT In this paper, nanoparticles of zinc stannate in different compositions were synthesized via chemical precipitation method. The as-synthesized material was characterized using differential scanning calorimetry. For the formation of crystalline zinc stannate, the synthesized material was annealed at 600°C. Surface morphologies of the samples were analyzed using scanning electron microscopy. The XRD pattern indicates the formation of nanocrystalline zinc stannate and it has a perovskite phase with an orthorhombic structure having a minimum crystallite size 4 nm. Pellets of the sensing materials were made by hydraulic press machine under a pressure of 616 MPa. Furthermore, the humidity sensing investigations of these sensing pellets were completed. Our results illustrate that zinc stannate in 1:4 weight ratio was most sensitive to humidity in comparison to other compositions under same conditions. Maximum sensitivity of the sensor was 3 GΩ/%RH. The results were reproducible up to 72% after 2 mon of ...
{"title":"Humidity Sensing Investigations on Nanostructured Zinc Stannate Synthesized via Chemical Precipitation Method","authors":"B. Yadav, Rama Singh, Satyendra Singh, P. Dwivedi","doi":"10.1080/19430892.2012.654742","DOIUrl":"https://doi.org/10.1080/19430892.2012.654742","url":null,"abstract":"ABSTRACT In this paper, nanoparticles of zinc stannate in different compositions were synthesized via chemical precipitation method. The as-synthesized material was characterized using differential scanning calorimetry. For the formation of crystalline zinc stannate, the synthesized material was annealed at 600°C. Surface morphologies of the samples were analyzed using scanning electron microscopy. The XRD pattern indicates the formation of nanocrystalline zinc stannate and it has a perovskite phase with an orthorhombic structure having a minimum crystallite size 4 nm. Pellets of the sensing materials were made by hydraulic press machine under a pressure of 616 MPa. Furthermore, the humidity sensing investigations of these sensing pellets were completed. Our results illustrate that zinc stannate in 1:4 weight ratio was most sensitive to humidity in comparison to other compositions under same conditions. Maximum sensitivity of the sensor was 3 GΩ/%RH. The results were reproducible up to 72% after 2 mon of ...","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"74 1","pages":"37-45"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80487457","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 : 2012-03-20DOI: 10.1080/19430892.2012.654744
S. Srivastava, Abhishek Kardam, K. R. Raj
ABSTRACT Strengthening the functional (COO−) group and nanotech reinforcement for binding of cationic metal species has been applied to cellulosic fibers. Modified Nano cellulosic fibers (NCFs) have been used for the remediation of cationic toxic metals from water bodies. Different polymerized NCFs exhibited enhancement in sorption efficiency (3 to 10%) and stability in terms of increased (3 to 5) regeneration cycles for Cd (II), Pb (II), Ni (II), and Cr (III) ions in single and multi-metal solutions. Novel NCFs have been characterized on the basis of Optical, TEM, FTIR, and TGA techniques and found to have enough potential for environmental clean-up.
{"title":"Nanotech Reinforcement onto Cellulosic Fibers: Green Remediation of Toxic Metals","authors":"S. Srivastava, Abhishek Kardam, K. R. Raj","doi":"10.1080/19430892.2012.654744","DOIUrl":"https://doi.org/10.1080/19430892.2012.654744","url":null,"abstract":"ABSTRACT Strengthening the functional (COO−) group and nanotech reinforcement for binding of cationic metal species has been applied to cellulosic fibers. Modified Nano cellulosic fibers (NCFs) have been used for the remediation of cationic toxic metals from water bodies. Different polymerized NCFs exhibited enhancement in sorption efficiency (3 to 10%) and stability in terms of increased (3 to 5) regeneration cycles for Cd (II), Pb (II), Ni (II), and Cr (III) ions in single and multi-metal solutions. Novel NCFs have been characterized on the basis of Optical, TEM, FTIR, and TGA techniques and found to have enough potential for environmental clean-up.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"80 1","pages":"46-53"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89418143","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 : 2012-03-20DOI: 10.1080/19430892.2012.656040
T. Sharma, Aradhana Chopra, M. Sapra, D. Kumawat, Supriya Deepak Patil, R. Pathania, N. Navani
ABSTRACT Developments in nanotechnology are leading to acceptance of this technology in day-to-day life as it continues to provide solutions and alternatives to technological, environmental, and health challenges. Central to all nanotechnology based applications are nanostructures, among which nanoparticles (NPs) are the ones most widely used. With a huge demand for various NPs, it is imperative that environmentally benign synthesis methods are developed. The majority of the existing procedures used for nanoparticle synthesis rely upon physical and chemical methods that sometimes utilize toxic and hazardous chemicals. The integration of the principles of green chemistry to nanotechnology toward the synthesis of “green” nanoparticles is a current requirement. One of the bioactive roles being investigated for NPs is their potential as antimicrobials. This review focuses on biomolecules, microbes, and phytoproducts in mediated green approaches for the synthesis of green silver nanoparticles (GSNPs) with due ...
{"title":"Green Synthesis and Antimicrobial Potential of Silver Nanoparticles","authors":"T. Sharma, Aradhana Chopra, M. Sapra, D. Kumawat, Supriya Deepak Patil, R. Pathania, N. Navani","doi":"10.1080/19430892.2012.656040","DOIUrl":"https://doi.org/10.1080/19430892.2012.656040","url":null,"abstract":"ABSTRACT Developments in nanotechnology are leading to acceptance of this technology in day-to-day life as it continues to provide solutions and alternatives to technological, environmental, and health challenges. Central to all nanotechnology based applications are nanostructures, among which nanoparticles (NPs) are the ones most widely used. With a huge demand for various NPs, it is imperative that environmentally benign synthesis methods are developed. The majority of the existing procedures used for nanoparticle synthesis rely upon physical and chemical methods that sometimes utilize toxic and hazardous chemicals. The integration of the principles of green chemistry to nanotechnology toward the synthesis of “green” nanoparticles is a current requirement. One of the bioactive roles being investigated for NPs is their potential as antimicrobials. This review focuses on biomolecules, microbes, and phytoproducts in mediated green approaches for the synthesis of green silver nanoparticles (GSNPs) with due ...","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"310 1","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76447759","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 : 2012-03-20DOI: 10.1080/19430892.2012.654745
K. Mukunthan, S. Balaji
Extensive work has been done to explore the potential promises of plant systems in the synthesis of metal nanoparticles. Herein, a convenient and rapid process for the formation of silver nanoparticles with natural reducing and capping agents of Daucus carrota (L.) is reported. The synchronization of secondary metabolites and enzymes as reducing/capping agents plays a vital role in the synthesis and stability of silver nanoparticles for approximately two months. Stable silver nanoparticles were formed by reacting tap root extract of D. carrota with an aqueous solution of AgNO3, which reduced Ag++ to Ag0. The synthesized silver nanoparticles were further characterized using UV spectrophotometry, Energy Dispersive X-ray Spectroscopy (EDAX), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD) methods. The synthesized silver nanoparticles were spherical and stable in aqueous medium ranges from 31–52 nm.
{"title":"Silver Nanoparticles Shoot Up from the Root of Daucus carrota (L.)","authors":"K. Mukunthan, S. Balaji","doi":"10.1080/19430892.2012.654745","DOIUrl":"https://doi.org/10.1080/19430892.2012.654745","url":null,"abstract":"Extensive work has been done to explore the potential promises of plant systems in the synthesis of metal nanoparticles. Herein, a convenient and rapid process for the formation of silver nanoparticles with natural reducing and capping agents of Daucus carrota (L.) is reported. The synchronization of secondary metabolites and enzymes as reducing/capping agents plays a vital role in the synthesis and stability of silver nanoparticles for approximately two months. Stable silver nanoparticles were formed by reacting tap root extract of D. carrota with an aqueous solution of AgNO3, which reduced Ag++ to Ag0. The synthesized silver nanoparticles were further characterized using UV spectrophotometry, Energy Dispersive X-ray Spectroscopy (EDAX), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD) methods. The synthesized silver nanoparticles were spherical and stable in aqueous medium ranges from 31–52 nm.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"32 1","pages":"54-61"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83134914","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 : 2012-03-20DOI: 10.1080/19430892.2012.654738
R. Srivastava
ABSTRACT Earlier studies have shown that nanomaterials are the most promising materials for modern development of science and technology. In this brief review, attention will be focused on a detailed introduction, the synthesis methods to prepare ceramic nanoparticles, and various characterization techniques.
{"title":"Synthesis and Characterization Techniques of Nanomaterials","authors":"R. Srivastava","doi":"10.1080/19430892.2012.654738","DOIUrl":"https://doi.org/10.1080/19430892.2012.654738","url":null,"abstract":"ABSTRACT Earlier studies have shown that nanomaterials are the most promising materials for modern development of science and technology. In this brief review, attention will be focused on a detailed introduction, the synthesis methods to prepare ceramic nanoparticles, and various characterization techniques.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"711 1","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75532321","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 : 2012-03-20DOI: 10.1080/19430892.2012.654741
S. Al-Thawadi, R. Cord-Ruwisch, M. Bououdina
ABSTRACT Ureolytic bacteria in the presence of high concentration of urea and calcium ions will precipitate calcite crystals in the form of nanocrystal aggregates. Those aggregates consolidate sandy materials by forming bridging points between sand particles. Bacterial cells that were isolated in a previous study, Bacillus sp. MCP11 (DSM 23526), were successfully concentrated in situ by up-loading 3-void volumes of cells followed by cementation solution (calcium/urea). Sandstone with UCS of 1200 kPa was formed with three applications of cells and cementation solution without clogging the void spaces resulting in a permeable consolidated sand core. ESEM images, EDS, and XRD analysis for the consolidated sandstone showed nanoparticles of rhombohedral calcite crystals aggregates of very fine particles at the nanoscale forming point-to-point contact between the sand particles.
{"title":"Consolidation of Sand Particles by Nanoparticles of Calcite after Concentrating Ureolytic Bacteria In Situ","authors":"S. Al-Thawadi, R. Cord-Ruwisch, M. Bououdina","doi":"10.1080/19430892.2012.654741","DOIUrl":"https://doi.org/10.1080/19430892.2012.654741","url":null,"abstract":"ABSTRACT Ureolytic bacteria in the presence of high concentration of urea and calcium ions will precipitate calcite crystals in the form of nanocrystal aggregates. Those aggregates consolidate sandy materials by forming bridging points between sand particles. Bacterial cells that were isolated in a previous study, Bacillus sp. MCP11 (DSM 23526), were successfully concentrated in situ by up-loading 3-void volumes of cells followed by cementation solution (calcium/urea). Sandstone with UCS of 1200 kPa was formed with three applications of cells and cementation solution without clogging the void spaces resulting in a permeable consolidated sand core. ESEM images, EDS, and XRD analysis for the consolidated sandstone showed nanoparticles of rhombohedral calcite crystals aggregates of very fine particles at the nanoscale forming point-to-point contact between the sand particles.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"56 1","pages":"28-36"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89047497","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 : 2012-03-20DOI: 10.1080/19430892.2012.654748
P. Khanna, K. Dhanabalan, P. More, S. Viswanathan, V. Renugopalakrishnan
ABSTRACT We herein present a simple one-step synthesis of CdSe quantum dots in aqueous medium using Na2SeSO3 as a source of Se and PVP and sodium succinate as the surfactant. The isolated orange to dark-red particles are re-dispersible in alcoholic and aq. medium. The optical spectra indicated blue shift of >150 nm. The hydrophilic quantum dots show excellent FWHM of approximately 44–60 nm in their photoluminescence spectra and the emission bands are centered around 570–590 nm. Absorption spectra maxima are observed in the range of 530–550 nm. The particle size from absorption wavelength is calculated to be about 5 nm and the XRD indicate cubic CdSe with impurities of selenium. It is observed that Se impurities enhanced PL intensity. Facile synthesis of CdSe QD has increasing value in biomedical applications.
{"title":"Biocompatible Hydrophilic CdSe Quantum Dots: Single-Step Synthesis","authors":"P. Khanna, K. Dhanabalan, P. More, S. Viswanathan, V. Renugopalakrishnan","doi":"10.1080/19430892.2012.654748","DOIUrl":"https://doi.org/10.1080/19430892.2012.654748","url":null,"abstract":"ABSTRACT We herein present a simple one-step synthesis of CdSe quantum dots in aqueous medium using Na2SeSO3 as a source of Se and PVP and sodium succinate as the surfactant. The isolated orange to dark-red particles are re-dispersible in alcoholic and aq. medium. The optical spectra indicated blue shift of >150 nm. The hydrophilic quantum dots show excellent FWHM of approximately 44–60 nm in their photoluminescence spectra and the emission bands are centered around 570–590 nm. Absorption spectra maxima are observed in the range of 530–550 nm. The particle size from absorption wavelength is calculated to be about 5 nm and the XRD indicate cubic CdSe with impurities of selenium. It is observed that Se impurities enhanced PL intensity. Facile synthesis of CdSe QD has increasing value in biomedical applications.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"1 1","pages":"62-70"},"PeriodicalIF":0.0,"publicationDate":"2012-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80187498","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 : 2012-02-07DOI: 10.1080/19430892.2012.739475
R. Bagheri, A. Kompany, N. Shahtahmasbi
ABSTRACT A colorimetric, label-free, and aggregation-based Ag nanoparticles (AgNPs) probe was developed for the detection of melamine and NaCl. A color change from yellow to blue with increasing melamine concentration was observed. The plasmon absorbance of the formed AgNPs allowed quantitative detection of melamine. A sensitive nonlinear correlation existed between the absorbance and the logarithm of melamine concentration, ranging from 1000 to 0.25 ppm. Detection of NaCl at a concentration of 10 ppm in raw milk was also observed.
{"title":"Fabrication and Calibration of an Ag Nanoparticles Sensor for Detecting the Melamine and NaCl Levels in Raw Milk","authors":"R. Bagheri, A. Kompany, N. Shahtahmasbi","doi":"10.1080/19430892.2012.739475","DOIUrl":"https://doi.org/10.1080/19430892.2012.739475","url":null,"abstract":"ABSTRACT A colorimetric, label-free, and aggregation-based Ag nanoparticles (AgNPs) probe was developed for the detection of melamine and NaCl. A color change from yellow to blue with increasing melamine concentration was observed. The plasmon absorbance of the formed AgNPs allowed quantitative detection of melamine. A sensitive nonlinear correlation existed between the absorbance and the logarithm of melamine concentration, ranging from 1000 to 0.25 ppm. Detection of NaCl at a concentration of 10 ppm in raw milk was also observed.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"128 1","pages":"484-488"},"PeriodicalIF":0.0,"publicationDate":"2012-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89184877","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 : 2012-02-07DOI: 10.1080/19430892.2012.738579
R. Bagheri, A. Kompany, N. Shahtahmasbi
ABSTRACT Silver nanoparticles were prepared by reduction of AgNO3 in dilute aqueous solutions of 4-nitroaniline. The effect of 4-nitroaniline concentration on Ag nanoparticles was investigated, and the sensitivity and selectivity of the prepared Ag nanoparticles solution on the presence of melamine in milk were studied. A color change from yellow to blue was observed with increasing melamine concentration. The characterization methods used were transmission electron microscopy (TEM) and ultraviolet-visible (UV-Vis) spectroscopy. The TEM images indicated that the silver nanoparticles solution consisted of well-dispersed agglomerates of spherical-shaped Ag nanoparticles with an average size of about 32 nm. The plasmon absorption peak of the silver nanoparticles was found at 397 nm. In addition, it was revealed that a sensitive nonlinear correlation existed between the absorbance and the logarithm of melamine concentrations ranging from 50 to 10 ppm.
{"title":"The Effect of 4-Nitroaniline Concentration on Ag Nanoparticles for Detecting the Melamine Level in Milk","authors":"R. Bagheri, A. Kompany, N. Shahtahmasbi","doi":"10.1080/19430892.2012.738579","DOIUrl":"https://doi.org/10.1080/19430892.2012.738579","url":null,"abstract":"ABSTRACT Silver nanoparticles were prepared by reduction of AgNO3 in dilute aqueous solutions of 4-nitroaniline. The effect of 4-nitroaniline concentration on Ag nanoparticles was investigated, and the sensitivity and selectivity of the prepared Ag nanoparticles solution on the presence of melamine in milk were studied. A color change from yellow to blue was observed with increasing melamine concentration. The characterization methods used were transmission electron microscopy (TEM) and ultraviolet-visible (UV-Vis) spectroscopy. The TEM images indicated that the silver nanoparticles solution consisted of well-dispersed agglomerates of spherical-shaped Ag nanoparticles with an average size of about 32 nm. The plasmon absorption peak of the silver nanoparticles was found at 397 nm. In addition, it was revealed that a sensitive nonlinear correlation existed between the absorbance and the logarithm of melamine concentrations ranging from 50 to 10 ppm.","PeriodicalId":13985,"journal":{"name":"International Journal of Green Nanotechnology","volume":"4 1","pages":"495-499"},"PeriodicalIF":0.0,"publicationDate":"2012-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82627358","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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