Download or read book Green Synthesis and Gold Alloying of Silver Molecular Nanoparticles written by Badri Bhattarai and published by . This book was released on 2018 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noble metal nanoparticles have been extensively studied for use in applications in a diverse range of fields such as optoelectronics, catalysis, sensing, medicine, etc. due to their unique properties that arise as a result of their dimensions. Metal nanoparticles of size less than 3 nm exhibit molecular properties, unlike larger nanoparticles. These molecular nanoparticles are excellent model systems to study the chemistry of nanomaterials at the molecular level as their molecular formulae, crystal structure, chemical composition, electronic structures etc. can be experimentally measured and theoretically calculated. In addition, knowledge of their thermodynamic stability and mechanisms of formation can be leveraged in developing green synthetic routes in order to produce safer products that widen the range of applications, and to develop safer processes that increase manufacturability and decrease waste. Even though nanoparticle research is more focused on the end product and their properties, rather than the process, we have taken a different route of dismantling the M4Ag44(p-MBA)30 nanoparticle synthesis and developing a green route with significantly improved efficiency and an 89% yield. The need of solvent, which contributed to 98% of the waste, was kept to a minimum by using a stoichiometric silver-thiolate polymer as a precursor to intimately mix the metal atoms and ligands, and by forming a paste using a small amount of liquid to promote mass transport. The process mass intensity (PMI), a green metric defined by material input over product output, was decreased by almost 18-fold compared to the solution-phase synthesis. Some toxic chemicals were also removed or replaced throughout the process. This method is very effective for thermodynamically favorable products, and should be useful for other systems too. Alloying of metal nanoparticles is advantageous to achieve new properties. For example, gold-silver bimetallic NPs can be more stable than silver NPs and have better optical properties than gold NPs. Here we have studied the alloying process in M4AuxAg44-x(p-MBA)30 alloy nanoparticles, where 0 = x = 12, and M is a countercation. Two methods were used to synthesize M4AuxAg44-x(p-MBA)30 alloy nanoparticles: (i) co-reduction of gold-thiolate and silver-thiolate with alkali borohydride, and (ii) galvanic-exchange reaction between gold-thiolate and M4Ag44(p-MBA)30 nanoparticles in order to substitute silver with gold. The major findings were: (i) the number of gold atoms incorporated in the alloy was always less than the gold input, (ii) only up to twelve gold atoms were incorporated, (iii) gold prefers to stay at the innermost core energetically in alloy nanoparticles, as shown by the x-ray crystal structure of M4Au12Ag32(p-MBA)30 alloy nanoparticles, (iv) gold atom distributions were generally Gaussian, and (v) addition of gold in silver nanoparticles to create alloys increases the stability against oxidation.

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

Download or read book Green Synthesis of Silver Nanomaterials written by Kamel A. Abd-Elsalam and published by Elsevier. This book was released on 2021-10-28 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Synthesis of Silver Nanomaterials illustrates how to biologically scale up silver nanoparticle synthesis. This book covers green synthesis of silver nanomaterials, via plants, agricultural waste, fungi, and microorganisms. Sections cover the synthesis and characterization of chemical and green synthesis, various types of silver nanomaterialism, the ability of different fungal species, such as filamentous fungi, to produce silver nanoparticles, the microbial synthesis of silver NMs, biosynthesis mechanisms, toxicity, fate and commercialization. As examples, greener pathways and mechanisms, toxicity of silver nanoparticles in aquatic life and in natural eco-systems, and strategies for the scaling up of green-synthesized nanomaterials are discussed. With the extended work in enhancing nanomaterials synthesis performance, and discovering their biomedical, environmental, and agricultural applications, it is hoped that the execution of these methods on a large scale and their industrial applications in different fields will take place in the near future. Assesses the impact of a large variety of silver-based nanostructures in the biomedical, environmental and agri-food sectors Discusses the major synthesis methods used for effectively processing plant-based silver nanoparticles Outlines the potential and major challenges for adopting green synthesis methods on a mass scale

Download or read book Gold and Silver Alloy Nanoparticles written by Chanaka Kapila Kumara and published by . This book was released on 2016 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology is an emerging field of science with applications in digital electronics, medicine, catalysis and energy. Gold nanoparticles are nanomaterials that have less than 100 nm at least in one dimension. The composition and the structure/geometry of the nanoparticles determine the chemical properties and reactivity. Modern research focus on method development in atomically monodisperse nanoparticle synthesis. This dissertation describes the method development for synthesis and isolation of atomically precise gold and gold-silver alloy nanoparticles and their comprehensive characterization and atomic structure investigation. Chapter one offers an introduction to the synthesis and isolation methods. These nanoparticles can be represented in the form of Aux(SR)y, where SR is the thiol ligand. The co-reduction method was used for alloy nanoparticle synthesis using a fixed total metal molar ratio. After considering various possible elements, silver were selected to study the formation of alloys to atomically precise gold nanoparticles. Chapter two includes a discussion of the characterization methods used in the nanoparticles community including scanning transmission electron microscopy, X-ray techniques, UV-visible spectroscopy. Alloying provides a way to tune the properties of materials which is very different from those of their monometallic counterpart. Chapter 3 describes such an effect on Au25(SR)18 gold nanomolecules by alloying with silver. The atomic arrangement of Au and Ag atoms in Au25-xAgx(SR)18 was determined by X-ray crystallography and it was found that Ag atoms were specifically localized in the 12 vertices of the icosahedral core. Among ultra-small nanomolecules, Au38(SR)24 is one of highly attractive nanomolecules due to high stability, availability of single crystal X-ray structure, unique spectroscopic features and intrinsic chirality. Chapter 4 highlights alloying effect on Au38(SR)24 nanomolecules. Chapter 5 describes the modulation of chemical and physical property of Au144(SR)60 by silver doping. UV-visible spectroscopy shows the Ag incorporation affects the electronic structure of the nanomolecules. The maximum number of Ag atoms substitute found to be 60. Chapter 6 describes the first composition determination of super-stable plasmonic nanoparticles in the 2 nm (or 76.3 kDa mass region) and its alloying. This atomically monodisperse plasmonic molecule contains exactly 329 gold atoms and 84 ligands. Apart from the mass spectrometric composition, further characterization was conducted using scanning transmission electron microscopy equipped with high angle annular dark field imaging (HAADF-STEM), high energy X-ray based atomic pair distribution function (PDF) analysis and small angle X-ray scattering (SAXS). Chapter 7 discusses the two largest nanocrystals produced at 2.4 and 2.9 nm with a composition of Au500±10(SR)120±3 and Au940±20(SR)160±4. Most importantly, we were able to successfully extend the mass spectrometric window up to 200 kDa for compositional determination and to study the molecular nature of nanocrystals.Chapter 8 highlight the contributions made from this dissertations toward the advancement of thiol protected nanoparticle research. (Abstract shortened by ProQuest.)

Download or read book Green Synthesis Characterization and Applications of Nanoparticles written by Ashutosh Kumar Shukla and published by Elsevier. This book was released on 2018-11-26 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Synthesis, Characterization and Applications of Nanoparticles shows how eco-friendly nanoparticles are engineered and used. In particular, metal nanoparticles, metal oxide nanoparticles and other categories of nanoparticles are discussed. The book outlines a range of methodologies and explores the appropriate use of each. Characterization methods include spectroscopic, microscopic and diffraction methods, but magnetic resonance methods are also included as they can be used to understand the mechanism of nanoparticle synthesis using organisms. Applications covered include targeted drug delivery, water purification and hydrogen generation. This is an important research resource for those wishing to learn more about how eco-efficient nanoparticles can best be used. Theoretical details and mathematical derivations are kept to a necessary minimum to suit the need of interdisciplinary audiences and those who may be relatively new to the field. Explores recent trends in growth, characterization, properties and applications of nanoparticles Gives readers an understanding on how they are applied through the use of case studies and examples Assesses the advantages and disadvantages of a variety of synthesis and characterization techniques for green nanoparticles in different situations

Download or read book Nanotechnology and Nanomaterial Applications in Food Health and Biomedical Sciences written by Deepak Kumar Verma and published by CRC Press. This book was released on 2019-08-23 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume discusses the multitude of possibilities for new development in nanotechnology that focuses on overcoming the problems and challenges faced by the biomedical and food industries. The volume hopes to facilitate the development of devices and materials that benefit patients and their healthcare. The book is broken into three parts that cover: nanotechnology techniques for biomedical applications nanoparticles and materials for food, health, and pharmaceutical application potential applications of nanotechnology in food safety

Download or read book Silver Nanoparticles written by Khan Maaz and published by . This book was released on 2018-07 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Green Synthesis of Nanoparticles Applications and Prospects written by Quaiser Saquib and published by Springer Nature. This book was released on 2020-10-19 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes various strategies for the synthesis of green nanoparticles using plant extracts and microbes, including the advantages and disadvantages of different methods and their applications. After discussing strategies for and the potential of green synthesis of noble metal nanoparticles, it highlights the role of the solvent system. The book then explores the stability/toxicity of nanoparticles and the associated-surface engineering techniques for achieving biocompatibility, and examines the antimicrobial efficacy of green nanoparticles with regard to various bacterial pathogens, as well as the underlying cytotoxicity mechanisms. Lastly, the book addresses the potential applications of various green nanoparticles in cancer theranostics, and reviews a number of plant-mediated nanoparticles as potential pharmaceutical agents. Given its scope, the book will be of interest to all scientists and students wanting to learn more about the synthesis and applications of green nanoparticles.

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 136 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.

Download or read book Silver Nanoparticles Synthesis Functionalization and Applications written by Parteek Prasher and published by Bentham Science Publishers. This book was released on 2022-03-14 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver Nanoparticles: Synthesis, Functionalization and Applications presents detailed information about the range of methods of synthesizing silver nanoparticles (AgNPs). The book systematically delves into the subject with an introductory chapter before moving to chemical synthesis of AGnPs and fabrication methods which help in assigning functional properties for useful nanomaterials. Basic and advanced synthetic methods like surface functionalization and bioconjugation are covered. Additionally, the book informs about impactful applications of AGNPs across a range of industries. Through this book, readers will be able to understand the importance of silver nanoparticles as a futuristic material in scientific investigations and gain a comprehensive understanding of the operational strategies revolving around their surface modification and conjugation. Key Features: -Covers the basics of silver nanoparticle (AGNP) synthesis -Focuses on green methods of AGNPs - Covers information about surface modification and functionalization of AGNPs with different molecules (including biomolecules) -Covers a range of applications of AGNPs -Includes advanced applications of AGNPs in next-generation antibiotics Silver Nanoparticles: Synthesis, Functionalization and Applications a handy reference for scholars in advanced chemical engineering, materials science and pharmacology programs as well as anyone who wants to know all about silver nanoparticles.

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

Download or read book Green Synthesis and Characterizations of Silver and Gold Nanoparticles written by Nora Elizondo and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Synthesis and Characterizations of Silver and Gold Nanoparticles.

Download or read book Metal Nanoparticles written by Daniel L. Fedlheim and published by CRC Press. This book was released on 2001-10-26 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art reference, Metal Nanoparticles offers the latest research on the synthesis, characterization, and applications of nanoparticles. Following an introduction of structural, optical, electronic, and electrochemical properties of nanoparticles, the book elaborates on nanoclusters, hyper-Raleigh scattering, nanoarrays, and several applications including single electron devices, chemical sensors, biomolecule sensors, and DNA detection. The text emphasizes how size, shape, and surface chemistry affect particle performance throughout. Topics include synthesis and formation of nanoclusters, nanosphere lithography, modeling of nanoparticle optical properties, and biomolecule sensors.

Download or read book Green Biosynthesis of Nanoparticles written by Mahendra Rai and published by CABI. This book was released on 2013-12-04 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are physical and chemical methods of synthesis of nanomaterials. But due to the damage caused by these methods to the environment there is a pressing need of green nanotechnology, which is a clean and eco-friendly technology for the development of nanomaterials. The present book includes green synthesis of nanoparticles by algae, diatoms and plants. The mechanism behind the synthesis of nanoparticles will also be discussed. The book would be a valuable resource for students, researchers and teachers of biology, chemistry, chemical technology, nanotechnology, microbial technology and those who are interested in green nanotechnology.

Download or read book Microbial Nanotechnology Green Synthesis and Applications written by Mohammad Azam Ansari and published by Springer Nature. This book was released on 2021-09-09 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the principles and mechanisms of the biological synthesis of nanoparticles from microorganisms, including bacteria, fungi, viruses, algae, and protozoans. It presents optimization processes for synthesis of microbes-mediated nanoparticles. The book also reviews the industrial and agricultural applications of microbially-synthesized nanoparticles. It also presents the medical applications of green nanoparticles, such as treating multidrug-resistant pathogens and cancer treatment. Further, it examines the advantages and prospects for the synthesis of nanoparticles by microorganisms. Lastly, it also presents the utilization of microbial-synthesized nanoparticles in the bioremediation of heavy metals.

Download or read book Silver Micro Nanoparticles written by Samir Kumar and published by BoD – Books on Demand. This book was released on 2021-09-15 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the different methodologies for producing and synthesizing silver nanoparticles (AgNPs) of various shapes and sizes. It also provides an in-depth understanding of the new methods for characterizing and modifying the properties of AgNPs as well as their properties and applications in various fields. This book is a useful resource for a wide range of readers, including scientists, engineers, doctoral and postdoctoral fellows, and scientific professionals working in specialized fields such as medicine, nanotechnology, spectroscopy, analytical chemistry diagnostics, and plasmonics.

Download or read book Synthesis of Nanoparticles Using Green Chemistry written by Farid Badria and published by GRIN Verlag. This book was released on 2019-12-16 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Document from the year 2017 in the subject Chemistry - Bio-chemistry, Mansoura University, language: English, abstract: Forty-two medicinal plants were collected depending on their availability on Egypt. These plant were extracted and screened for their activity towards green synthesis of AgNPs. A new modified method was used in order to screen large number of extracts in short time (high throughput screening). In this method, the synthesized nanoparticles were evaluated in using 96-well plate which is transparent to facilitate the color monitoring and easy to be read spectrophotometrically using microplate reader. The green synthesis activity by the different plant extracts was monitored and evaluated by color change and UV-Vis absorption at time intervals. Out of these 42 plants, only 3 plants viz.,Pyllanthusemblicafruits, Psidium guajava leaves and Lawsoniainermisleaves, showed high AgNPs synthetic activity. The most active plant extracts were further partitioned with ethyl acetate. The results showed that the EtOAc fraction of the three active plants showed superior AgNPs green synthesis over their remaining aqueous. Thus, chromatographic columns were used to isolate the active compounds from the EtOAc fraction of each plant. Metal nanoparticles synthesis is a leading topic of research in modern material science owing to their distinctive potential applications in the field of electronic, optoelectronic, information storage and Health care. Among the all noble metal nanoparticles, silver nanoparticles are one the main products in the field of nanotechnology which has acquired limitless attention due to their unique properties such as chemical stability, good conductivity, catalytic and most important antibacterial, antiviral and antifungal activities. Nevertheless, there is still need for economic commercially viable as well as environmentally clean synthesis route to synthesize the silver nanoparticles.