scholarly journals Synthesis, characterization and applications of chitosan based metallic nanoparticles: A review

2021 ◽  
Vol 13 (2) ◽  
pp. 544-551
Author(s):  
Devendra Kumar Verma ◽  
Rajdeep Malik ◽  
Jagram Meena ◽  
Rashmi Rameshwari
Keyword(s):  
Metallic Nanoparticles ◽  
Synthesis Methods ◽  
Controlled Synthesis ◽  
Metallic Nanoparticle ◽  
Size And Shape ◽  
Degree Of Acetylation ◽  
Important Host ◽  
The Subject ◽  
Medium Method ◽  
Reaction Degree

Chitosan as a natural biopolymer has been produced to be the important host for the preparation of metallic nanoparticles (MNPs) because of its excellent characteristics like:- good stabilizing and capping ability, biocompatibility, biodegradability, eco-friendly and non-toxicity properties. Chitosan can play a very important role for synthesis of metallic nanoparticles, as chitosan is a cationic polymer. It attracts metal ions and reduces them and also Capps and stabilizes. So basically chitosan can be responsible for the controlled synthesis of metallic nanoparticle. Chitosan has a very good chelating property. This property is due to its –NH2 and –OH functional groups. Size and shape of metallic nanoparticles are much affected by chitosan concentration, molecular weight, time of reaction, degree of acetylation of chitosan, pH of the medium, method of synthesis and type of derivative of chitosan etc. Metallic nanoparticles`s properties and applications are much associated with their size and shape. Optimization of the metallic nanoparticle size and shape has been the subject of curiosity for nanotechnology scientist. Chitosan can solve this problem by applying the optimization conditions. But a very little work is reported about: - how chitosan can affect the size and shape of metallic nanoparticles and how can it reduce metal salts to prepare metallic nanoparticle, stablilized in chitosan metrics. This is very first report as a review article highlighting the effect of chitosan on synthesis of metallic nanoparticles and optimization conditions. This review will also be beneficial for scientist working on food sensing application of nanoparticles.  Various synthesis methods and applications of chitosan based metallic nanoparticles have also been reported in details.

Metallic Nanoparticle Synthesis by Green Chemistry

2018 ◽  
Vol 11 (6) ◽  
pp. 4287-4294
Author(s):  
Anikate Sood ◽  
Shweta Agarwal
Keyword(s):  
Green Chemistry ◽  
Green Synthesis ◽  
Biomedical Research ◽  
Metallic Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Synthesis Methods ◽  
Metallic Nanoparticle ◽  
Medical Field ◽  
Advantages And Disadvantages ◽  
Gold Silver

Nanotechnology is the most sought field in biomedical research. Metallic nanoparticles have wide applications in the medical field and have gained the attention of various researchers for advanced research for their application in pharmaceutical field. A variety of metallic nanoparticles like gold, silver, platinum, palladium, copper and zinc have been developed so far. There are different methods to synthesize metallic nanoparticles like chemical, physical, and green synthesis methods. Chemical and physical approaches suffer from certain drawbacks whereas green synthesis is emerging as a nontoxic and eco-friendly approach in production of metallic nanoparticles. Green synthesis is further divided into different approaches like synthesis via bacteria, fungi, algae, and plants. These approaches have their own advantages and disadvantages. In this article, we have described various metallic nanoparticles, different modes of green synthesis and brief description about different metabolites present in plant that act as reducing agents in green synthesis of metallic nanoparticles. 

scholarly journals Green and Cost-Effective Synthesis of Metallic Nanoparticles by Algae: Safe Methods for Translational Medicine

2020 ◽  
Vol 7 (4) ◽  
pp. 129
Author(s):  
Bushra Uzair ◽  
Ayesha Liaqat ◽  
Haroon Iqbal ◽  
Bouzid Menaa ◽  
Anam Razzaq ◽  
...  
Keyword(s):  
Metallic Nanoparticles ◽  
Molecular Mechanisms ◽  
Cost Effective ◽  
Trisodium Citrate ◽  
Synthesis Methods ◽  
Metallic Ions ◽  
Size And Shape ◽  
Potential Applications ◽  
Spr Effect ◽  
Physical And Chemical

Metal nanoparticles (NPs) have received much attention for potential applications in medicine (mainly in oncology, radiology and infectiology), due to their intriguing chemical, electronical, catalytical, and optical properties such as surface plasmon resonance (SPR) effect. They also offer ease in controlled synthesis and surface modification (e.g., tailored properties conferred by capping/protecting agents including N-, P-, COOH-, SH-containing molecules and polymers such as thiol, disulfide, ammonium, amine, and multidentate carboxylate), which allows (i) tuning their size and shape (e.g., star-shaped and/or branched) (ii) improving their stability, monodispersity, chemical miscibility, and activity, (iii) avoiding their aggregation and oxidation over time, (iv) increasing their yield and purity. The bottom-up approach, where the metal ions are reduced in the NPs grown in the presence of capping ligands, has been widely used compared to the top-down approach. Besides the physical and chemical synthesis methods, the biological method is gaining much consideration. Indeed, several drawbacks have been reported for the synthesis of NPs via physical (e.g., irradiation, ultrasonication) and chemical (e.g., electrochemisty, reduction by chemicals such as trisodium citrate or ascorbic acid) methods (e.g., cost, and/ortoxicity due to use of hazardous solvents, low production rate, use of huge amount of energy). However, (organic or inorganic) eco-friendly NPs synthesis exhibits a sustainable, safe, and economical solution. Thereby, a relatively new trend for fast and valuable NPs synthesis from (live or dead) algae (i.e., microalgae, macroalgae and cyanobacteria) has been observed, especially because of its massive presence on the Earth’s crust and their unique properties (e.g., capacity to accumulate and reduce metallic ions, fast propagation). This article discusses the algal-mediated synthesis methods (either intracellularly or extracellularly) of inorganic NPs with special emphasis on the noblest metals, i.e., silver (Ag)- and gold (Au)-derived NPs. The key factors (e.g., pH, temperature, reaction time) that affect their biosynthesis process, stability, size, and shape are highlighted. Eventually, underlying molecular mechanisms, nanotoxicity and examples of major biomedical applications of these algal-derived NPs are presented.

scholarly journals Biogenic nanoparticles: a comprehensive perspective in synthesis, characterization, application and its challenges

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Sunita Patil ◽  
Rajkuberan Chandrasekaran
Keyword(s):  
Green Chemistry ◽  
Metallic Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Industrial Applications ◽  
Synthesis Process ◽  
Synthesis Methods ◽  
Main Body ◽  
Metallic Nanoparticle ◽  
Plant Resources ◽  
Synthesis Of Nanoparticles

Abstract Background Translating the conventional scientific concepts into a new robust invention is a much needed one at a present scenario to develop some novel materials with intriguing properties. Particles in nanoscale exhibit superior activity than their bulk counterpart. This unique feature is intensively utilized in physical, chemical, and biological sectors. Each metal is holding unique optical properties that can be utilized to synthesize metallic nanoparticles. At present, versatile nanoparticles were synthesized through chemical and biological methods. Main body of abstract Metallic nanoparticles pose numerous scientific merits and have promising industrial applications. But concerning the pros and cons of metallic nanoparticle synthesis methods, researchers elevate to drive the synthesis process of nanoparticles through the utilization of plant resources as a substitute for use of chemicals and reagents under the theme of green chemistry. These synthesized nanoparticles exhibit superior antimicrobial, anticancer, larvicidal, leishmaniasis, wound healing, antioxidant, and as a sensor. Therefore, the utilization of such conceptualized nanoparticles in treating infectious and environmental applications is a warranted one. Conclusion Green chemistry is a keen prudence method, in which bioresources is used as a template for the synthesis of nanoparticles. Therefore, in this review, we exclusively update the context of plant-based metallic nanoparticle synthesis, characterization, and applications in detailed coverage. Hopefully, our review will be modernizing the recent trends going on in metallic nanoparticles synthesis for the blooming research fraternities. Graphical abstract

scholarly journals In-Liquid Plasma Process for Size- and Shape-Controlled Synthesis of Silver Nanoparticles by Controlling Gas Bubbles in Water

Materials ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 891 ◽  
Author(s):  
Hyun-Jin Kim ◽  
Jun-Goo Shin ◽  
Choon-Sang Park ◽  
Dae Kum ◽  
Bhum Shin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gas Bubbles ◽  
Controlled Synthesis ◽  
Plasma Process ◽  
Size And Shape ◽  
Shape Controlled

scholarly journals Bimetallic Nanocrystals: Structure, Controllable Synthesis and Applications in Catalysis, Energy and Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1926
Author(s):  
Gaojie Li ◽  
Wenshuang Zhang ◽  
Na Luo ◽  
Zhenggang Xue ◽  
Qingmin Hu ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Chemical Properties ◽  
Research Progress ◽  
Synthesis Methods ◽  
Controlled Synthesis ◽  
Controllable Synthesis ◽  
Composition And Structure ◽  
Bimetallic Nanocrystals ◽  
Physical And Chemical ◽  
And Chemical Properties

In recent years, bimetallic nanocrystals have attracted great interest from many researchers. Bimetallic nanocrystals are expected to exhibit improved physical and chemical properties due to the synergistic effect between the two metals, not just a combination of two monometallic properties. More importantly, the properties of bimetallic nanocrystals are significantly affected by their morphology, structure, and atomic arrangement. Reasonable regulation of these parameters of nanocrystals can effectively control their properties and enhance their practicality in a given application. This review summarizes some recent research progress in the controlled synthesis of shape, composition and structure, as well as some important applications of bimetallic nanocrystals. We first give a brief introduction to the development of bimetals, followed by the architectural diversity of bimetallic nanocrystals. The most commonly used and typical synthesis methods are also summarized, and the possible morphologies under different conditions are also discussed. Finally, we discuss the composition-dependent and shape-dependent properties of bimetals in terms of highlighting applications such as catalysis, energy conversion, gas sensing and bio-detection applications.

MOLECULAR DYNAMICS SIMULATION ON HYDROGEN STORAGE IN METALLIC NANOPARTICLES

2009 ◽  
Vol 08 (01n02) ◽  
pp. 39-42 ◽  
Author(s):  
HIROSHI OGAWA ◽  
AKINORI TEZUKA ◽  
HAO WANG ◽  
TAMIO IKESHOJI ◽  
MASAHIKO KATAGIRI
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Storage ◽  
Metallic Nanoparticles ◽  
Structural Modification ◽  
Structural Features ◽  
Dynamics Simulation ◽  
Metallic Nanoparticle ◽  
Hydrogen Atoms ◽  
Diffusion Of Hydrogen ◽  
Storage Properties

Hydrogen storage in a metallic nanoparticle was simulated by classical molecular dynamics. Distribution of hydrogen atoms inside nanoparticle was investigated by changing length and energy parameters of metal– H bonds. Hydrogen atoms diffused into the particle and distributed homogeneously in case of weak metal– H bonds. In case of strong metal– H bonds, a hydrogen-rich surface layer was observed which suppresses the inward diffusion of hydrogen atoms. Structural modification of nanoparticle accompanied by grain boundary formation due to hydrogen loading was also observed. These variations in dynamical and structural features are considered to affect the hydrogen storage properties in nanoparticles.

Nanoscale covalent organic frameworks: from controlled synthesis to cancer therapy

2021 ◽  
Author(s):  
Xuelu He ◽  
Zhenqi Jiang ◽  
Ozioma Udochukwu Akakuru ◽  
Juan Li ◽  
Aiguo Wu
Keyword(s):  
Cancer Therapy ◽  
Synthesis Methods ◽  
Controlled Synthesis ◽  
Covalent Organic Frameworks ◽  
Feature Article

The controlled synthesis methods and the applications of nanoscale covalent organic frameworks in cancer therapy are summarized in this feature article.

PROVIDING FREE LEGAL ASSISTANCE TO PERSONS SENTENCED TO IMPRISONMENT IN RUSSIA AND THE USA: A COMPARATIVE ANALYSIS

2021 ◽  
pp. 14-19
Author(s):  
Оксана Алексеевна Владимирова
Keyword(s):  
United States ◽  
Comparative Analysis ◽  
The United States ◽  
Synthesis Methods ◽  
Legal Assistance ◽  
American System ◽  
The Usa ◽  
Legal Foundations ◽  
The Subject ◽  
Domestic Practice

Статья посвящена исследованию опыта оказания бесплатной юридической помощи осужденным к лишению свободы в США, а также проведению сравнительного анализа данного и отечественного опыта. Целью работы является изучение основных организационных аспектов и правовых основ оказания юридической помощи такой категории граждан, как осужденные, с целью установления закономерностей и выявления возможности использования положительных аспектов указанного опыта в российском законодательстве. Методы, использующиеся при написании статьи: диалектический, анализ, синтез, сравнительно-правовой. В статье последовательно изучается организация оказания бесплатной юридической помощи осужденным и их родственникам в различных регионах (штатах) США. Особое внимание уделяется субъектам оказания помощи, а также специфике отдельных механизмов и особенностей работы организаций по оказанию безвозмездной помощи осужденным. В качестве особенности американской системы оказания правовой помощи автор особенно выделяет предметный (специализированный) подход к вопросам оказания помощи - отдельные организации занимаются оказанием помощи по выбранному узкому кругу вопросов. Исследование российского опыта правовой помощи осужденным позволяет отметить некоторые преимущества. Вместе с тем, анализ проблем, существующих в системе оказания бесплатной юридической помощи осужденным к лишению свободы, позволил сделать вывод о необходимости совершенствования системы юридической помощи в России. В результате работы выявлен положительный опыт, возможный для применения в российском законодательстве. The article is devoted to the study of the experience of providing free legal assistance to those sentenced to imprisonment in the United States, as well as to the comparative analysis of this experience and that available in domestic practice. The purpose of this work is to study the main organizational aspects and legal foundations of providing legal assistance to such a category of citizens as convicts in order to establish patterns and identify the possibility of using the positive aspects of this experience in Russian legislation. Methods used in this study: dialectical method of cognition, analysis, synthesis, methods of comparative law. The article consistently examines the organization of the provision of free legal assistance to convicts and their relatives in various regions (states) of the United States. Great attention is paid to the subjects of assistance, as well as the specifics of individual mechanisms and features of the work of organizations to provide gratuitous assistance to convicts. As a feature of the American system of providing legal assistance, the author especially highlights the subject (specialized) approach to assistance issues - individual organizations are involved in providing assistance on a selected narrow range of issues. The study of the Russian experience of legal assistance to convicts reveals some advantages. At the same time, the analysis of the problems existing in the system of providing free legal assistance to those sentenced to imprisonment made it possible to conclude that it is necessary to improve the system of legal assistance in Russia. As a result of the work, a positive experience was revealed that could be applied in Russian legislation.

Size and shape-controlled synthesis of Ru nanocrystals

2018 ◽  
Vol 3 (12) ◽  
Author(s):  
Linlin Xu ◽  
Jun Yang
Keyword(s):  
Noble Metal ◽  
Chemical Properties ◽  
Controlled Synthesis ◽  
One Dimensional ◽  
Size And Shape ◽  
The Past ◽  
Metal Nanomaterials ◽  
Shape Controlled ◽  
Synthetic Approaches ◽  
Coherent Picture

Abstract Mastery over the size/shape of nanocrystals (NCs) enables control of their properties and enhancement of their usefulness for a given application. Within the past decades, the development of wet-chemistry methods leads to the blossom of research in noble metal nanomaterials with tunable sizes and shapes. We herein would prefer to devote this chapter to introduce the solution-based methods for size and shape-controlled synthesis of ruthenium (Ru) NCs, which can be summarized into five categories: (i) Synthesis of spherical Ru NCs; (ii) synthesis of one-dimensional (1D) Ru NCs, e.g. wires and rods; (iii) synthesis of two-dimensional (2D) Ru NCs, e.g. nanoplates; (iv) synthesis of Ru NCs with hollow interiors and (v) synthesis of Ru NCs with other morphologies, e.g. chains, dendrites and branches. We aim at highlighting the synthetic approaches and growth mechanisms of these types of Ru NCs. We also introduce the detailed characterization tools for analysis of Ru NCs with different sizes/shapes. With respect to the creation of great opportunities and tremendous challenges due to the accumulation in noble metal nanomaterials, we briefly make some perspectives for the future development of Ru NCs so as to provide the readers a systematic and coherent picture of this promising field. We hope this reviewing effort can provide for technical bases for effectively designing and producing Ru NCs with enhanced physical/chemical properties. Graphical Abstract: The solution-based methods for size and shape-controlled synthesis of ruthenium nanocrystals as well as the mechanisms behind them are extensively reviewed.

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