Pub Date : 2018-01-01DOI: 10.4172/2324-8777-c1-021
M. Caravaca, Lucy A. Valdez, R. Casali
{"title":"Strain effects on the elastic and electronic properties of Core/Shell nanowires of ZnO/X (X=ZnS, BeO)","authors":"M. Caravaca, Lucy A. Valdez, R. Casali","doi":"10.4172/2324-8777-c1-021","DOIUrl":"https://doi.org/10.4172/2324-8777-c1-021","url":null,"abstract":"","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81230970","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 : 2018-01-01DOI: 10.4172/2324-8777-C2-024
A. Alahmad, T. Scheper
T Green synthesis of silver nanoparticles (Ag NPs) with biological molecules through using of plants has received much attention lately because it is fast, effective and environmentally friendly[1-2]. The present study reports that Ag NPs were synthesized from a silver nitrate solution with Hypericum perforatum L (St John's wort) [4-5] aqueous extracts with different concentrations. Resulting Ag NPs were characterized by UV-VIS spectroscopy, Atomic Force Microscopy (AFM), Fourier Transform Infrared (FTIR) Spectroscopy, Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), x-ray diffraction (XRD), Nanoparticle Tracking Analysis (NTA), atomic absorption spectroscopy (AAS) and Energy Disperse X-ray Spectroscopy (EDX). At the end of this work we have monodisperse spherical nanoparticles, their size is approximately between 20 to 50 nm as is evident through the results and images: TEM, SEM, DLS and NTA. These nanoparticles were coated with a protective surface layer from a component or group of organic components that have not been identified so far. Currently the composition of the surface layer is investigated using High-performance liquid chromatography-mass spectrometry (HPLC-MS) and (GC-MS). UV–VIS absorption studies revealed the presence of surface Plasmon resonance (SPR) peaks in range of 425-450 nm. The XRD studies, energy dispersive X-ray analysis confirmed the formation of metallic silver and these particles are crystallized in face-centered cubic structure. The EDX spectrum indicated the presence of 71% of silver particles by weight with least impurities. FTIR showed that nanoparticles were capped with biomoieties on their surface, where it refers to the hydrophilic functional groups in the capping matrix which can improve the stability of AgNPs. In future work, these nanoparticles will be conjugated with aptamers to result in specific targeting of tumor cells [3], where the small size of produced AgNPs will facilitate penetration of tissues.
利用植物与生物分子绿色合成银纳米粒子(Ag NPs)因其快速、有效、环保等优点近年来备受关注[1-2]。本研究报道了用不同浓度的贯叶连翘(Hypericum perforatum L, St . John’s wort)[4-5]水提物在硝酸银溶液中合成Ag NPs。采用紫外-可见光谱、原子力显微镜(AFM)、傅里叶变换红外光谱(FTIR)、动态光散射(DLS)、扫描电镜(SEM)、透射电镜(TEM)、x射线衍射(XRD)、纳米颗粒跟踪分析(NTA)、原子吸收光谱(AAS)和能量分散x射线光谱(EDX)对所得Ag NPs进行了表征。在这项工作的最后，我们得到了单分散的球形纳米颗粒，它们的尺寸大约在20到50纳米之间，这从结果和图像中可以看出:TEM, SEM, DLS和NTA。这些纳米颗粒表面覆盖着一层保护层，保护层由一种或一组有机成分组成，这些有机成分迄今尚未被识别出来。目前主要采用高效液相色谱-质谱联用(HPLC-MS)和气相色谱-质谱联用(GC-MS)对其表层成分进行研究。紫外-可见吸收研究表明，表面等离子体共振(SPR)峰在425-450 nm范围内存在。XRD研究和x射线能谱分析证实了金属银的形成，这些颗粒呈面心立方结构结晶。EDX光谱显示，71%的银颗粒以重量计存在，杂质最少。FTIR结果表明，纳米颗粒表面有生物基团的封盖，其中生物基团是指封盖基质中的亲水性官能团，可以提高AgNPs的稳定性。在未来的工作中，这些纳米颗粒将与适体偶联，从而导致肿瘤细胞的特异性靶向[3]，其中产生的AgNPs的小尺寸将有助于穿透组织。
{"title":"Green biosynthesis of Silver Nanoparticles (AgNPs) by using aqueous extracts of Hypericum perforatum L (St John's wort) for cancer targeting","authors":"A. Alahmad, T. Scheper","doi":"10.4172/2324-8777-C2-024","DOIUrl":"https://doi.org/10.4172/2324-8777-C2-024","url":null,"abstract":"T Green synthesis of silver nanoparticles (Ag NPs) with biological molecules through using of plants has received much attention lately because it is fast, effective and environmentally friendly[1-2]. The present study reports that Ag NPs were synthesized from a silver nitrate solution with Hypericum perforatum L (St John's wort) [4-5] aqueous extracts with different concentrations. Resulting Ag NPs were characterized by UV-VIS spectroscopy, Atomic Force Microscopy (AFM), Fourier Transform Infrared (FTIR) Spectroscopy, Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), x-ray diffraction (XRD), Nanoparticle Tracking Analysis (NTA), atomic absorption spectroscopy (AAS) and Energy Disperse X-ray Spectroscopy (EDX). At the end of this work we have monodisperse spherical nanoparticles, their size is approximately between 20 to 50 nm as is evident through the results and images: TEM, SEM, DLS and NTA. These nanoparticles were coated with a protective surface layer from a component or group of organic components that have not been identified so far. Currently the composition of the surface layer is investigated using High-performance liquid chromatography-mass spectrometry (HPLC-MS) and (GC-MS). UV–VIS absorption studies revealed the presence of surface Plasmon resonance (SPR) peaks in range of 425-450 nm. The XRD studies, energy dispersive X-ray analysis confirmed the formation of metallic silver and these particles are crystallized in face-centered cubic structure. The EDX spectrum indicated the presence of 71% of silver particles by weight with least impurities. FTIR showed that nanoparticles were capped with biomoieties on their surface, where it refers to the hydrophilic functional groups in the capping matrix which can improve the stability of AgNPs. In future work, these nanoparticles will be conjugated with aptamers to result in specific targeting of tumor cells [3], where the small size of produced AgNPs will facilitate penetration of tissues.","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88606365","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 : 2018-01-01DOI: 10.4172/2324-8777.1000252
Yan Wanjun, Qin Xinmao, Zhang Chunhong, Z. Zhongzheng, Zhou Shiyun
The geometrical structure, energy band structure, density of states and optical properties of La, Ce and Th doped two-dimensional (2D) SiC are investigated by using the first-principle method. Geometrical structure results show that all of the doping atoms cause obvious distortion of the crystal lattice near the doping atoms, and the degree of distortion is related to the covalent radius of different doping atoms. The pure 2D SiC is a direct-gap semiconductor with a gap of 2.60 eV. Near the Fermi energy, the density of states is mainly composed of C-2p and Si-3p. When doping with La, Ce and Th, the band gap of 2D SiC decreased and all of them turn into quasi-direct band-gap semiconductors. The valence band of La and Th doped 2D SiC are mainly composed of C-2p, Si-3p, La-5d and Th-6d, respectively, while Ce-doped has little effect on the valence band of 2D SiC. The conduction band of La, Ce and Th doped 2D SiC are mainly composed of Si-3p, La-5d, Ce-4f and Th-6s6d5f, respectively. When Si atom is replaced by rare earth atom, the rare earth atoms lose their charges. The bond of rare earth atom and C atom has weak covalent, while ionic is stronger. Among all of the studied systems, La-doped 2D SiC has the biggest static dielectric constant 2.33, the biggest peak of e2(ω) in the low energy region, the maximum refractive index n0 1.53. Ce-doped 2D SiC has the maximum absorption 6.88 × 104 cm-1 in the lower energy region. La or Ce doped 2D SiC can enhance the absorption in the lower energy region, while Th-doped will decrease the absorption of 2D SiC in the range of 0 ~ 15 eV. The research results will provide some theoretical guidance for the development and application of 2D SiC.
{"title":"Photoelectric Properties of La, Ce, Th Doped 2D SiC: A First Principle Study","authors":"Yan Wanjun, Qin Xinmao, Zhang Chunhong, Z. Zhongzheng, Zhou Shiyun","doi":"10.4172/2324-8777.1000252","DOIUrl":"https://doi.org/10.4172/2324-8777.1000252","url":null,"abstract":"The geometrical structure, energy band structure, density of states and optical properties of La, Ce and Th doped two-dimensional (2D) SiC are investigated by using the first-principle method. Geometrical structure results show that all of the doping atoms cause obvious distortion of the crystal lattice near the doping atoms, and the degree of distortion is related to the covalent radius of different doping atoms. The pure 2D SiC is a direct-gap semiconductor with a gap of 2.60 eV. Near the Fermi energy, the density of states is mainly composed of C-2p and Si-3p. When doping with La, Ce and Th, the band gap of 2D SiC decreased and all of them turn into quasi-direct band-gap semiconductors. The valence band of La and Th doped 2D SiC are mainly composed of C-2p, Si-3p, La-5d and Th-6d, respectively, while Ce-doped has little effect on the valence band of 2D SiC. The conduction band of La, Ce and Th doped 2D SiC are mainly composed of Si-3p, La-5d, Ce-4f and Th-6s6d5f, respectively. When Si atom is replaced by rare earth atom, the rare earth atoms lose their charges. The bond of rare earth atom and C atom has weak covalent, while ionic is stronger. Among all of the studied systems, La-doped 2D SiC has the biggest static dielectric constant 2.33, the biggest peak of e2(ω) in the low energy region, the maximum refractive index n0 1.53. Ce-doped 2D SiC has the maximum absorption 6.88 × 104 cm-1 in the lower energy region. La or Ce doped 2D SiC can enhance the absorption in the lower energy region, while Th-doped will decrease the absorption of 2D SiC in the range of 0 ~ 15 eV. The research results will provide some theoretical guidance for the development and application of 2D SiC.","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"172 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76945720","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 : 2018-01-01DOI: 10.4172/2324-8777-c6-035
Elnaz Erfanian, Saba Vahdat Farimani
{"title":"Nano-structure chitosan-based hydrogels as drug delivery system","authors":"Elnaz Erfanian, Saba Vahdat Farimani","doi":"10.4172/2324-8777-c6-035","DOIUrl":"https://doi.org/10.4172/2324-8777-c6-035","url":null,"abstract":"","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73596721","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 : 2018-01-01DOI: 10.4172/2324-8777-c5-032
F. Louka
{"title":"Nano-and microsensors in determination of cardiovascular system lifespan","authors":"F. Louka","doi":"10.4172/2324-8777-c5-032","DOIUrl":"https://doi.org/10.4172/2324-8777-c5-032","url":null,"abstract":"","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77662808","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 : 2018-01-01DOI: 10.4172/2324-8777.1000255
Anant Shah, M. Jaeger, D. Harris-Birtill, N. deSouza, J. Bamber
Gold nanorods hold great potential for bio sensing, imaging and therapy applications. The seed-mediated approach is the most widely used technique for the synthesis of gold nanorods. However, batches of nanorods synthesized using this method have a broadened longitudinal plasmon (LP) peak and uncertainty in the wavelength of the peak. This paper describes a technique to tune the synthesized nanorod distributions by using laser pulses at specific wavelengths that either reduce the width of the population LP peak or control its position. The overlap between the LP peaks of pairs of batches of gold nanorods was successfully reduced by at least 9%. Batches of nanorods with a sharper LP peak and/or a more desirable LP resonance wavelength could eventually be utilized in molecular biosensing and imaging applications requiring the simultaneous detection and differentiation of multiple aspectratio gold nanorods.
{"title":"On the Potential for Tuning the Longitudinal Plasmon Band of a Distribution of Gold Nanorods Using a Tunable Laser","authors":"Anant Shah, M. Jaeger, D. Harris-Birtill, N. deSouza, J. Bamber","doi":"10.4172/2324-8777.1000255","DOIUrl":"https://doi.org/10.4172/2324-8777.1000255","url":null,"abstract":"Gold nanorods hold great potential for bio sensing, imaging and therapy applications. The seed-mediated approach is the most widely used technique for the synthesis of gold nanorods. However, batches of nanorods synthesized using this method have a broadened longitudinal plasmon (LP) peak and uncertainty in the wavelength of the peak. This paper describes a technique to tune the synthesized nanorod distributions by using laser pulses at specific wavelengths that either reduce the width of the population LP peak or control its position. The overlap between the LP peaks of pairs of batches of gold nanorods was successfully reduced by at least 9%. Batches of nanorods with a sharper LP peak and/or a more desirable LP resonance wavelength could eventually be utilized in molecular biosensing and imaging applications requiring the simultaneous detection and differentiation of multiple aspectratio gold nanorods.","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"77 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89026248","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 : 2018-01-01DOI: 10.4172/2324-8777-C7-038
Riley Gatensby
{"title":"Plasma etching of high molecular weight block-co-polymer patterns into glass for optical applications","authors":"Riley Gatensby","doi":"10.4172/2324-8777-C7-038","DOIUrl":"https://doi.org/10.4172/2324-8777-C7-038","url":null,"abstract":"","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75644639","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 : 2018-01-01DOI: 10.4172/2324-8777.1000257
Dalavi Sb, Raj Mm
Novel polyol methodologies (named as: route-1 and route-2) have been developed for synthesis of PVP capped nanostructured Co in organic (DMF) medium at lower temperature of 110oC. Co nanoparticles (nps) crystallize in hcp and fcc structures with average crystallite size of 16.4 nm and 37.1 nm, for route-1 and route-2, respectively. TEM micrographs show chain-like and nearly spherical nanostructures for Co nps synthesized via route-1 and route-2, respectively. We could obtain the maximum value of MS and Hc, i.e., 167 emu/g and 357 Oe, respectively, for nanostructured Co synthesized via route-1 at 100 K. Variations in saturation magnetizations (Ms) and coercivity (Hc) values have been explained mainly on the basis of fine particle size, shape, surface and altered crystal anisotropies.
{"title":"Novel Synthesis and Magnetic Properties of PVP Capped Cobalt Nanostructures","authors":"Dalavi Sb, Raj Mm","doi":"10.4172/2324-8777.1000257","DOIUrl":"https://doi.org/10.4172/2324-8777.1000257","url":null,"abstract":"Novel polyol methodologies (named as: route-1 and route-2) have been developed for synthesis of PVP capped nanostructured Co in organic (DMF) medium at lower temperature of 110oC. Co nanoparticles (nps) crystallize in hcp and fcc structures with average crystallite size of 16.4 nm and 37.1 nm, for route-1 and route-2, respectively. TEM micrographs show chain-like and nearly spherical nanostructures for Co nps synthesized via route-1 and route-2, respectively. We could obtain the maximum value of MS and Hc, i.e., 167 emu/g and 357 Oe, respectively, for nanostructured Co synthesized via route-1 at 100 K. Variations in saturation magnetizations (Ms) and coercivity (Hc) values have been explained mainly on the basis of fine particle size, shape, surface and altered crystal anisotropies.","PeriodicalId":16457,"journal":{"name":"Journal of Nanomaterials & Molecular Nanotechnology","volume":"166 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73282994","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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