Solution Sythesis Of Geranium Nanocrystals
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| Author | : |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 2003 |
| Genre | : |
| ISBN | : |
We present a two-steps synthesis route that yields nanometer size crystalline germanium in the form of a black powder. It relies on high temperature decomposition of tetraethylgermane (TEG) in organic solvents. The presence of pure germanium with diamond structure is unambiguously attested by powder XRD measurements. Low resolution TEM indicates that the particles are between ≈5 to 30 nm in size depending on the synthesis conditions. The as-synthesized Ge powders can be stored in air for months and no oxidation occurs. The Ge powders are sparingly soluble in conventional solvents because Ge nanocrystals are likely embedded in a matrix, composed mainly of C=C, C-C, and C-H bonds. The presence of residual organic by-products impedes probing of the optical properties of the dots. Also, we discuss drawbacks and open challenges in high temperature solution synthesis of Ge nanocrystals that could also be faced in the synthesis of Si nanocrystals. Overall, our results call for a cautious interpretation of reported optical properties of Ge and Si nanocrystals obtained by high temperature solution methods.
| Author | : Neha Agarwal |
| Publisher | : Bentham Science Publishers |
| Total Pages | : 342 |
| Release | : 2024-08-01 |
| Genre | : Science |
| ISBN | : 9815238973 |
Green Solutions for Degradation of Pollutants is a compilation of reviews on environmental remediation by sustainable techniques. The book helps readers understand the potential of such techniques in resolving the growing problem of environmental pollutants. The editors have compiled 13 comprehensive reviews on green remediation techniques such as microbial bioremediation, nano-bioremediation, phytoremediation, and green-nanoremediation for the remediation of a variety of pollutants, including wastewater, microplastics, metals and other contaminants. Materials highlighted in the chapters include carbon quantum dots, plant extracts, metallic and organic nanoparticles. Green Solutions for Degradation of Pollutants is a reference book for readers who need to comprehend the practical application of green remediation techniques.
| Author | : Hyun Gyung Kim |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2020 |
| Genre | : |
| ISBN | : |
Approaches to colloidal synthesis have rapidly developed to control the size, shape, and composition of various semiconductors, offering cost reductions, controllability, and scalability. Of semiconductor materials, germanium nanomaterials are known to be the most difficult to synthesize in solution-based methods because of their high crystallization temperature. Zero-dimensional germanium nanocrystals were synthesized by the heat-up method, without any strong reducing agent. Subsequently, finely controlled size-selective precipitation narrowed size distributions, and size-selected nanocrystals successfully created a monolayer germanium nanocrystals superlattice. One-dimensional germanium nanorods were synthesized by the solution–liquid–solid method using tin nanoparticles as seeds. By forming a liquid alloy with the tin seed at the eutectic temperature, which is much lower than the crystallization temperature, germanium nanorods were grown from the tin seed. A monophenylsilane enhanced the yield of germanium nanorods by promoting the phenyl redistribution of diphenylgermane, a germanium precursor. Using a mixture of HCl and HF, tin seeds were completely removed from the tips of the germanium nanorods, leaving germanium crystalline nanorods. Nonvolatile memories, a key component in various electronics and portable systems, include phase-change memory, a leading technology that has seen exponential growth in demand over the last decade. One important class of phase change materials are compounds on the GeTe–Sb2Te3 tie line. Despite interesting properties of the nanomaterials, colloidal synthesis of phase change material nanocrystals has only been rarely reported. In the present study, three representative phase change material nanocrystals, GeTe, Sb2Te3, and Ge2Sb2Te5, were successfully synthesized using the hot-injection method. A poly(vinylpyrrolidinone)–hexadecane (PVP–HDE) polymer was essential for the nanocrystal dispersion and making ternary Ge2Sb2Te5 nanocrystals. Two solvents, oleylamine and trioctylphosphine, were studied for synthesizing all three nanocrystals and reveal the conversion chemistry of phase change material precursors
| Author | : Suvardhan Kanchi |
| Publisher | : John Wiley & Sons |
| Total Pages | : 705 |
| Release | : 2018-10-18 |
| Genre | : Technology & Engineering |
| ISBN | : 1119418860 |
This groundbreaking book uniquely focuses on the exploration of the green synthesis of metal nanoparticles and their characterization and applications. Metal nanoparticles are the basic elements of nanotechnology as they are the primary source used in the design of nanostructured devices and materials. Nanomaterials can be manufactured either incidentally, with physical or chemical methods, or naturally; and the high demand for them has led to their large-scale production by various toxic solvents or high energy techniques. However, due to the growing awareness of environmental and safety issues, the use of clean, nontoxic and environment-friendly ways to synthesize metal nanoparticles has emerged out of necessity. The use of biological resources, such as microbes, plant parts, vegetable wastes, agricultural wastes, gums, etc., has grown to become an alternative way of synthesizing metal nanoparticles. This biogenic synthesis is green, environmentally friendly, cost-effective, and nontoxic. The current multi-authored book includes recent information and builds a database of bioreducing agents for various metal nanoparticles using different precursor systems. Green Metal Nanoparticles also highlights different simple, cost-effective, environment-friendly and easily scalable strategies, and includes parameters for controlling the size and shape of the materials developed from the various greener methods.
| Author | : Goran Nikolic |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 542 |
| Release | : 2011-04-01 |
| Genre | : Mathematics |
| ISBN | : 9533072326 |
New analytical strategies and techniques are necessary to meet requirements of modern technologies and new materials. In this sense, this book provides a thorough review of current analytical approaches, industrial practices, and strategies in Fourier transform application.
| Author | : Stefanos Mourdikoudis |
| Publisher | : Royal Society of Chemistry |
| Total Pages | : 483 |
| Release | : 2021-05-17 |
| Genre | : Science |
| ISBN | : 1839161655 |
This book will highlight the role of reducing agents in the chemical synthesis of nanoparticle systems.
| Author | : Indu Bhushan |
| Publisher | : Springer Nature |
| Total Pages | : 432 |
| Release | : 2020-02-22 |
| Genre | : Science |
| ISBN | : 3030345440 |
Nanotechnology is considered as one of the emerging fields of science. It has applications in different biological and technological fields which deal with the science of materials at nanoscale (10-9). On the other hand, biotechnology is another field that deals with contemporary challenges. Nanobiotechnology fills the gap between these two fields. It merges physical, chemical, and biological principles in a single realm. This combination opens up new possibilities. At nanoscale dimensions, it creates precise nanocrystals and nanoshells. Integrated nanomaterials are used with modified surface layers for compatibility with living systems, improved dissolution in water, or biorecognition leading to enhanced end results in biotechnological systems. These nanoparticles can also be hybridized with additional biocompatible substances in order to amend their qualities to inculcate novel utilities. Nanobiotechnology is used in bioconjugate chemistry by coalescing up the functionality of non-organically obtained molecular components and biological molecules in order to veil the immunogenic moieties for targeted drug delivery, bioimaging and biosensing. This book blends the science of biology, medicine, bioinorganic chemistry, bioorganic chemistry, material and physical sciences, biomedical engineering, electrical, mechanical, and chemical science to present a comprehensive range of advancements. The development of nano-based materials has made for a greater understanding of their characterization, using techniques such as transmission electron microscope, FTIR, X-ray diffraction, scanning electron microscope EDX, and so on. This volume also highlights uses in environmental remediation, environmental biosensors and environmental protection. It also emphasizes the significance of nanobiotechnology to a series of medical applications viz., diagnostics, and therapeutics stem cell technology, tissue engineering enzyme engineering, drug development and delivery. In addition this book also offers a distinctive understanding of nanobiotechnology from researchers and educators and gives a comprehensive facility for future developments and current applications of nanobiotechnology.
| Author | : Farid Badria |
| Publisher | : GRIN Verlag |
| Total Pages | : 196 |
| Release | : 2019-12-16 |
| Genre | : Science |
| ISBN | : 3346083454 |
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.
| Author | : Elena-Daniela Ion |
| Publisher | : |
| Total Pages | : 91 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
| Author | : Mihir Kumar Purkait |
| Publisher | : Elsevier |
| Total Pages | : 286 |
| Release | : 2022-11-30 |
| Genre | : Medical |
| ISBN | : 0443185360 |
Advances in Extraction and Applications of Bioactive Phytochemicals presents comprehensive and systematic coverage of extraction techniques for bioactive phytochemical compounds and their delivery and therapeutic effectiveness. Sections focus on the pharmaceutical industry’s perspective, aiming at compiling recent advances of natural products in the field of drug delivery, including a brief overview of plant-based bioactive molecules, utilization of different plant elements for the extraction of phytochemicals, a compilation of conventional extraction approaches, advanced extraction methods, including Supercritical carbon-dioxide extraction, computational methods to improve production, drug delivery aspects of bioactive phytochemicals, their therapeutic effectiveness, and more. This book is a complete reference targeted at pharma researchers in academic and corporate environments and those willing to apply the most current extraction methods and health applications. Researchers in medicinal chemistry and chemical engineering will also benefit from this comprehensive resource. Offers a consistent compilation of the most current phytochemical extraction techniques Includes detailed protocols for extraction Covers the main classes of naturally occurring bioactive phytochemical compounds
