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Author : Pengchong Liu
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (934 download)
Download or read book Synthesis and Characterization of Silica-coated Gold Nanorods written by Pengchong Liu and published by . This book was released on 2015 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Danielle Kristin Smith
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.:/5 (458 download)
Download or read book Synthesis and Characterization of Carbon Nanotubes, Gold Nanorods, Silica Coated Nanocrystals, and Binary Nanocrystal Superlattices written by Danielle Kristin Smith and published by . This book was released on 2009 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials such as carbon nanotubes, gold nanorods, magnetic nanocrystals, and binary nanocrystal superlattices have exciting potential applications. However, before these ideas can be applied, it is imperative to fully understand the materials synthesis. Multiwall carbon nanotubes were synthesized in supercritical toluene using cobaltocene, nickelocene, ferrocene, or metal nanocrystals as catalysts. Toluene served as both the solvent and carbon source for nanotube growth. The reaction was optimized by introducing supplemental carbon sources; either hexane or ethanol increased the yield relative to pure toluene and catalytic amounts of water minimized carbon filament and amorphous carbon formation. Gold nanorods were synthesized by the colloidal seed-mediated, surfactantassisted approach using cetyltrimethylammonium bromide (CTAB) obtained from ten different suppliers. The gold nanorod yield depended strongly on the CTAB used: with the same recipe, three of the CTABs produced only spherical particles, whereas the other CTABs produced nanorods with nearly 100% yield. Inductively coupled plasma mass spectrometry revealed a trace iodide impurity in the CTABs that did not yield nanorods. Further experiments introducing potassium iodide to the nanorod synthesis verified the detrimental effect of iodide on nanorod formation. Multifunctional colloidal core-shell nanoparticles of magnetic nanocrystals or gold nanorods coated with a fluorescent dye (Tris(2,2' -bipyridyl)dichlororuthenium(II) hexahydrate) doped silica shells were also synthesized. The as-prepared magnetic nanocrystals were initially hydrophobic and silica coated using a microemulsion approach, while the gold nanorods were hydrophilic and silica coated using a Stöber process. These colloidal heterostructures have the potential to be used as dual-purpose tags, exhibiting a fluorescent signal that could be combined with either dark-field optical contrast or enhanced contrast in magnetic resonance imaging. Binary superlattices (BSLs) of large iron oxide and small gold nanocrystals were assembled by slow evaporation of colloidal dispersions on tilted substrates. SEM and grazing incidence small angle X-ray scattering (GISAXS) confirmed the BSLs were simple hexagonal AB2 superlattices with long range order. GISAXS also revealed that the superlattice was slightly contracted perpendicular to the substrate as a result of solvent drying during the deposition process. Additionally, in some BSLs nearly periodic superlattice dislocations consisting of inserted half-planes of gold nanocrystals were observed.
Author : Marie Carmelle Serviane Pierre-Bolivar
Publisher :
ISBN 13 :
Total Pages : 139 pages
Book Rating : 4.:/5 (871 download)
Download or read book Synthesis and Characterization of Perm-selective SERS-active Silica-coated Gold Nanospheres for the Direct Detection of Small Molecules written by Marie Carmelle Serviane Pierre-Bolivar and published by . This book was released on 2013 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Above this value, however, uncontrolled nanoparticle aggregation occurred and large but irreproducible SERS signal intensities were monitored. Next, gold nanoparticles were encapsulated with varying silica shell thicknesses and purified using traditional centrifugation steps and/or column chromatography. Relative to the traditionally purified (i.e. centrifuged) samples, the SERS responses from small molecules using the column purified nanoparticle samples followed a well-known SERS distance-dependence model. Thus, surface chemistry cannot form more than a 2 nm thick layer on gold nanospheres if SERS applications were targeted. To overcome these challenges, gold nanospheres encapsulated with a thick silica shell were made SERS-active by etching the internal silica layer near the metal surface.
Author : Milind Laxman Surve
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (548 download)
Download or read book Silica Coating of Gold Nanoparticles written by Milind Laxman Surve and published by . This book was released on 2003 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The project deals with the synthesis and characterization of gold-silica core-shell nanoparticles. It uses solution chemistry to polymerize silica on gold surface and form a coating of desirable thickness. . . However, this research specifically deals with coating gold nanoparticles of size less than 15 nm, like 10 nm, 5 nm and 2 nm."--Introduction, p. 2.
Author : Stephan Dankesreiter
Publisher : Diplomica Verlag
ISBN 13 : 383669199X
Total Pages : 173 pages
Book Rating : 4.8/5 (366 download)
Download or read book Advanced Synthesis of Gold and Zirconia Nanoparticles and Their Characterization written by Stephan Dankesreiter and published by Diplomica Verlag. This book was released on 2011 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of small and smallest particle is one of today's key features in modern science. The goal is to form materials with improved properties than their "classical" ancestors with just a fractional amount of raw material. However, the characterization of these particles is as important as their way of preparation. Different techniques with their origins in physics, inorganic, organic and physical chemistry have to be combined to reveal the secrets of this important field of science. This book gives a short overview of theoretical basics and synthesis methods to form and characterize gold and zirconia nanoparticles. Phenomenon like plasmon resonance self-assembly of surfactants and the different structures of ZnO2 are explained. Furthermore, analytical tools, like small angle X-ray scattering, X-ray powder diffraction and scanning electron microscopy are introduced. In addition, details on the synthesis of gold and zirconia nanoparticles are presented and are examined by the mentioned analytical and calorimetric methods.
Download or read book Synthesis & Characterization of Silica Coated Iron Oxide Nanoparticles by Sol-Gel Technique written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: \Alpha$-Fe_2O_3$ nanoparticles and Silica Coated $Fe_2O_3$ Particles were synthesized by hydrothermal method and acid - base hydrolysis of TEOS respectively. The Core Shell Particles has been characterized by SEM, XRD, and Particle size analysis. From particle size analysis, it was seen that, the distribution maxima of $Fe_2O_3$ and $Fe_2O_3@SiO_2$ coated nanoparticle were of 120 & 350 nm, 150nm & 550 nm respectively. From XRD analysis, it was confirmed that silica sample nanoparticles is amorphous in nature. The SEM/EDX analysis data represents the presence of $Fe_2O_3@SiO_2$ and show only the compositions of $Si, O & Fe2O_3$ peaks. As $Fe_2O_3$ nanoparticles show applications in many fields including high density magnetic storage devices, ferrofluids, magnetic refrigeration systems, and catalysis. Aggregation of nanoparticles can be prevented by coating the particles with other materials. The core/shell structure enhances the thermal and chemical stability of the nanoparticles, improves solubility, makes them less cytotoxic and allows conjugation of other molecules to these particles.
Author : Andrew Theron Heitsch
Publisher :
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.:/5 (669 download)
Download or read book Synthesis and Characterization of Silicon Nanowires, Silicon Nanorods, and Magnetic Nanocrystals written by Andrew Theron Heitsch and published by . This book was released on 2010 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon nanowires, silicon nanorods, and magnetic nanocrystals have shown interesting size, shape, mechanical, electronic, and/or magnetic properties and many have proposed their use in exciting applications. However, before these materials can be applied, it is critical to fully understand their properties and how to synthesize them economically and reproducibly. Silicon nanowires were synthesized in high boiling point ambient pressure solvents using gold and bismuth nanocrystals seeds and trisilane as the silicon precursor. Reactions temperatures as low as 410°C were used to promote the solution-liquid-solid (SLS) growth of silicon nanowires. The silicon nanowires synthesis was optimized to produce 5 mg of silicon nanowires with average diameters of 30 nm and lengths exceeding 2 [mu]m by adjusting the silicon to gold ratio in the injection mixture and reaction temperature. Silicon nanorods were synthesized using a solution-based arrested-SLS growth approach where gold seeds, trisilane, and a dodecylamine were vital to the success. Dodecylamine was found to prevent gold seed coalescence at high temperatures -- creating small diameter rods -- and bond to the crystalline silicon surface -- preventing silicon nanorod aggregation. Furthermore, an etching strategy was developed using an emulsion of aqua regia and chloroform to remove the gold seeds from the silicon nanorods tip. A thin silicon shell surrounding the gold seed of the silicon nanorod was subsequently observed. Multifunctional colloidal core-shell nanoparticles of iron platinum or iron oxide encapsulated in fluorescent dye doped silica shells were also synthesized. The as-prepared magnetic nanocrystals are initially hydrophobic and were coated with a uniform silica shell using a microemulsion approach. These colloidal heterostructures have the potential to be used as dual-purpose tags, exhibiting a fluorescent signal that could be combined with enhanced magnetic resonance imaging contrast. Compositionally-ordered, single domain, antiferromagnetic L12 FePt3 and ferromagnetic L10 FePt nanocrystals were synthesized by coating colloidally-grown Pt-rich or stoichiometricly equal Fe-Pt nanocrystals with thermally-stable SiO2 and annealing at high temperature. Without the silica coating, the nanocrystals transform predominately into the L10 FePt phase due to interparticle diffusion of Fe and Pt atoms. Magnetization measurements of the L12 FePt3 nanocrystals revealed two antiferromagnetic transitions near the bulk Neél temperatures of 100K and 160K. Combining L12 FePt3 nanocrystals with L10 FePt nanocrystals was found to produce a constriction in field-dependent magnetization loops that has previously been observed near zero applied field in ensemble measurements of single domain silica-coated L10 FePt nanocrystals. Dipole interactions between FePt@SiO2 nanoparticles with varying SiO2 shell thickness was also explored.
Author : George Kyzas
Publisher : BoD – Books on Demand
ISBN 13 : 1789230888
Total Pages : 372 pages
Book Rating : 4.7/5 (892 download)
Download or read book Novel Nanomaterials written by George Kyzas and published by BoD – Books on Demand. This book was released on 2018-04-18 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Nanomaterials" is a special topic of recent research and is a milestone of nanoscience and nanotechnology. Nanoscale materials are a series of substances/compounds, in which at least one dimension has smaller size than 100 nm. Nanomaterials have a broad area of development, which is growing rapidly day by day. Their impact on commercial applications as well as on the respective academia and education is huge. The basic points of this book can be divided into synthesis of nanomaterials and their applications. For example, special mention is about metal-oxide nanostructures, nanocomposites, and polymeric nanomaterials. Also, synthesis, characterizations, various processes, fabrications and some promising applications are also developed and analyzed.
Author : Stefan Matthew Murphy
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (433 download)
Download or read book Synthesis and Characterization of Gold Nanoparticles written by Stefan Matthew Murphy and published by . This book was released on 2006 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Valerio Voliani
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501511459
Total Pages : 113 pages
Book Rating : 4.5/5 (15 download)
Download or read book Gold Nanoparticles written by Valerio Voliani and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-04-20 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold nanoparticles provide a platform for the development of new and efficient diagnostic and therapeutic tools.This book offers a general guide to the synthesis and coating of gold nanoparticles. It describes the links between optical features and geometries of gold nanoparticles and provides a readily comprehensible connection in all the chapters between the geometry of gold nanoparticles and their final applications.
Author : Suban K. Sahoo
Publisher : Elsevier
ISBN 13 : 0323994555
Total Pages : 454 pages
Book Rating : 4.3/5 (239 download)
Download or read book Gold and Silver Nanoparticles written by Suban K. Sahoo and published by Elsevier. This book was released on 2023-01-20 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold and Silver Nanoparticles: Synthesis and Applications provides detailed information on the preparation and utilization of Au- and Ag-based nanoparticles in a range of novel areas. Gold and silver nanoparticles offer a range of interesting properties, including unique size-dependent optoelectronic properties, chemical stability and biocompatibility, ease of synthesis and surface modification, excellent resistance to corrosion, and catalytic properties, hence paving the way to a wide range of cutting-edge applications with continual advances and innovations. Sections introduce gold and silver nanoparticles, fundamental theory, synthesis, and characterization techniques before focusing on requirements and preparation methods. Specific applications areas, such as surface-enhanced Raman spectroscopy (SERS), sensing and biosensing, imaging, drug and gene delivery, disease diagnosis, catalysis, and optoelectronic device fabrication are covered. Finally, synthesis and applications of platinum- and palladium-based nanoparticles are discussed. This is a valuable resource for researchers and advanced students across nanoscience and nanotechnology, chemistry, and materials science, as well as scientists, engineers, and R&D professionals with an interest in noble metal nanomaterials for a range of industrial applications. - Explains theory, synthesis, characterization, and properties of Au- and Ag- based nanoparticles - Explores a range of novel applications across biomedicine, optoelectronics, and other areas - Analyzes the latest developments in the field and considers noble metal nanoparticles beyond gold and silver
Author : Kristina L. Tran
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (811 download)
Download or read book Synthesis, Characterization, and Self-Assembly of Gold Nanorods and Nanoprisms written by Kristina L. Tran and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The unique properties of gold nanoparticles make them excellent candidates for applications in electronics, sensing, imaging, and photothermal therapy. Though abundant literature exists for isotropic gold nanoparticles, work on nanoparticles of different shapes has been gaining interest recently. Anisotropic gold nanoparticles, such as nanorods and nanoprisms, have tunable optical properties in the visible and near-infrared regions. Through synthesis and surface modification, the production of various shapes of these gold nanoparticles can be controlled to meet different applications. Two different types of gold nanorods were used in this thesis. The first type was stabilized with cetyltrimethylammonium bromide (CTAB) and had aspect ratios of 3-4 (defined as the nanorod length divided by the diameter). The second type was synthesized using CTAB and benzyldimethylhexadecylammonium chloride (BDAC) in a binary surfactant system which produced aspect ratios greater than 4. The nanorods were characterized with UV-Vis spectroscopy and transmission electron microscopy (TEM). Two types of bowl-shaped macrocyclic compounds called resorcinarenes were used to direct self-assembly of the nanorods. The first type of resorcinarene (R2S) consisted of thiol(SH)-terminated alkyl chains on both rims. The second type (R1S) contained thiol-terminated alkyl chains on only one rim. The monolayer formation of these resorcinarenes on planar gold surfaces was studied and characterized by FTIR spectroscopy. Resorcinarene-mediated assembly of gold nanorods was monitored with UV-Vis spectroscopy, dynamic light scattering (DLS), and TEM. In addition to gold nanorods, gold nanoprisms were synthesized through a kinetically-controlled reduction route in the presence of CTAB. The linking of nanoprisms using resorcinarenes was also explored.
Author : Mohammed Muzibur Rahman
Publisher : BoD – Books on Demand
ISBN 13 : 1789849985
Total Pages : 172 pages
Book Rating : 4.7/5 (898 download)
Download or read book Gold Nanoparticles written by Mohammed Muzibur Rahman and published by BoD – Books on Demand. This book was released on 2019-02-13 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold Nanoparticles - Reaching New Heights contains recent research on the preparation, characterization, fabrication, and potential of optical and biological applications of gold nanoparticles (AuNPs). It is promising novel research that has received a lot of interest over the last few decades. It covers advanced topics on optical, physical, medicinal, and biological applications of AuNPs. Development of green nanotechnology is generating the interest of researchers towards the synthesis of eco-friendly, safe, non-toxic applications, which can be used for manufacture at a large scale. These are simple, cost-effective, stable, enduring, and reproducible aqueous room temperature synthesis applications to obtain the self-assembly of AuNPs. This potentially unique work offers various approaches to R
Author :
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (911 download)
Download or read book Synthesis and Characterization of Gold Nanoparticles and Their Interactions with Biological Systems written by and published by . This book was released on 2014 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Margarita Sanchez-Dominguez
Publisher : Elsevier
ISBN 13 : 0128017589
Total Pages : 538 pages
Book Rating : 4.1/5 (28 download)
Download or read book Nanocolloids written by Margarita Sanchez-Dominguez and published by Elsevier. This book was released on 2016-03-09 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanocolloids: A Meeting Point for Scientists and Technologists presents an easy-to-read approach to current trends in nanoscale colloid chemistry, which offers relatively simple and economically feasible ways to produce nanomaterials. Nanocolloids have been the subjects of major development in modern technology, with many current and future applications. The book helps scientists and technologists to understand the different aspects of modern nanocolloid science. It outlines the underlying fundamental principles of nanocolloid science and covers applications ranging from emulsions to dispersions and suspensions. You will find details on experimental techniques and methods for the synthesis and characterization of nanocolloids, including the latest developments in nanoemulsions and nanoparticles. - Edited by leading academics with over 10 years' experience in the field of colloid and surfactant science - Each chapter is authored by recognized experts in the field - Outlines the underlying fundamental science behind nanocolloids - Provides comprehensive coverage of current topics and potential applications in nanocolloid science - Presents a multidisciplinary approach to help chemical engineers, chemists, physicists, materials scientists and pharmacologists, form an in-depth understanding of nanocolloid science
Author : Babak Nikoobakht
Publisher :
ISBN 13 :
Total Pages : 542 pages
Book Rating : 4.:/5 (518 download)
Download or read book Synthesis, Characterization and Self-assembly of Gold Nanorods an Surface-enhanced Raman Studies written by Babak Nikoobakht and published by . This book was released on 2002 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jiaji Cheng
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (945 download)
Download or read book Fine-tuned Silica Nanohelices as Platforms for Chiral Organization of Gold Nanoparticles written by Jiaji Cheng and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silica nanomaterials can be easily fabricated, fashioned and functionalized as platforms for grafting of nanoparticles for biomedical and optical applications. Herein, we utilize a template-based methodology to prepare a diverse collection of helical gold nanoparticle (GNPs) superstructures having controllable handedness and structural metrics by using GNPs as the building blocks, and the silica nanohelices as the template. The synthesized materials exhibit well-defined chiral arrangement of GNPs following the helicity of silica nanohelices, showing plasmonic circular dichorism (CD) signals. Further observations proved this plasmon CD comes from the chiral arrangement of GNPs and this effect is highly size, scale and pH dependent. We expect that this assembly strategy will discover a better view towards metamaterials and spark the view towards “bottom-up” approaches in nanoscience.
