scholarly journals Biosynthesis and Potential Applications of Silver and Gold Nanoparticles and Their Chitosan-Based Nanocomposites in Nanomedicine

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Haliza Katas ◽  
Noor Zianah Moden ◽  
Chei Sin Lim ◽  
Terence Celesistinus ◽  
Jie Yee Chan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Cost Effective ◽  
One Pot ◽  
Silver And Gold Nanoparticles ◽  
Stabilizing Agents ◽  
Cost Effective Method ◽  
Multistep Process ◽  
Potential Applications ◽  
Biological Sources

Biosynthesized or biogenic metallic nanoparticles, particularly silver and gold nanoparticles (AgNPs and AuNPs, respectively), have been increasingly used because of their advantages, including high stability and loading capacity; moreover, these nanoparticles are synthesized using a green and cost-effective method. Previous studies have investigated reducing and/or stabilizing agents from various biological sources, including plants, microorganisms, and marine-derived products, using either a one-pot or a multistep process at different conditions. In addition, extensive studies have been performed to determine the biological or pharmacological effects of these nanoparticles, such as antimicrobial, antitumor, anti-inflammatory, and antioxidant effects. In the recent years, chitosan, a natural cationic polysaccharide, has been increasingly investigated as a reducing and/or stabilizing agent in the synthesis of biogenic metallic nanoparticles with potential applications in nanomedicine. Here, we have reviewed the mechanism of biosynthesis and potential applications of AgNPs and AuNPs and their chitosan-mediated nanocomposites in nanomedicine.

One-pot synthesis of a TiO2–CdS nano-heterostructure assembly with enhanced photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34942-34948 ◽  
Author(s):  
Sayantan Mazumdar ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Cadmium Sulfide ◽  
Self Assembly ◽  
Cost Effective ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cost Effective Method

An unprecedented morphology of a titanium dioxide (TiO2) and cadmium sulfide (CdS) self-assembly obtained using a ‘truly’ one-pot and highly cost effective method with a multi-gram scale yield is reported here.

scholarly journals Borophosphate glass as an active media for CuO nanoparticle growth: an efficient catalyst for selenylation of oxadiazoles and application in redox reactions

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcos R. Scheide ◽  
Marcos M. Peterle ◽  
Sumbal Saba ◽  
José S. S. Neto ◽  
Guilherme F. Lenz ◽  
...  
Keyword(s):  
Glass Surface ◽  
Metallic Nanoparticles ◽  
Copper Oxide Nanoparticles ◽  
Phenol Hydroxylation ◽  
One Pot ◽  
Efficient Catalyst ◽  
Stabilizing Agents ◽  
Nanoparticle Growth ◽  
Air Atmosphere ◽  
Free Process

Abstract Herein, we report the preparation of CuO@ borophosphate nanoparticles (CuOnano@glass) and their wide catalytic applications. The glass annealing, under a controlled atmosphere, enables the growth of copper nanoparticles on the glass surface (not within) by an uncommon bottom-up process. Following the thermal annealing of metallic nanoparticles under air atmosphere, supported copper oxide nanoparticles CuONPs on the glass surface can be obtained. The approach enables the glass matrix to be explored as a precursor and a route for the synthesis of supported copper-based nanoparticles in a solvent-free process without immobilization steps or stabilizing agents. In order to demonstrate the wide synthetic utility of this CuONPs glass-based catalyst, one-pot three-component domino reactions were performed under an air atmosphere, affording the desired selenylated oxadiazoles in good to excellent yields. We also extended the application of these new materials as a glass-based catalyst in the phenol hydroxylation and the reduction of 4-nitrophenol.

Rapid and Clean Biomimetic Synthesis of Bimetallic Au-Ag Nanoparticles Using an otherwise Worthless and Noxious Weed Ipomoea (Ipomoea carnea)

2015 ◽  
Vol 31 ◽  
pp. 1-14 ◽  
Author(s):  
Sami Ullah Ganaie ◽  
Sruthi Ravindran ◽  
Tasneem Abbasi ◽  
Shahid Abbas Abbasi
Keyword(s):  
Ag Nanoparticles ◽  
Cost Effective ◽  
Biomimetic Synthesis ◽  
One Pot ◽  
X Ray ◽  
Stabilizing Agents ◽  
Ambient Temperatures ◽  
Molar Ratios ◽  
Noxious Weed ◽  
Average Size

In a first report of its type, gainful utilization of the obnoxious weed ipomoea (Ipomoeacarnea;also known as:I.fistulosa) has been achieved by developing a procedure on its basis for clean-green one pot synthesis of bimetallic Au-Ag nanoparticles. In it the leaf and the stem extracts of the weed serve as reducing as well as stabilizing agents. With the support of Scanning Electron Microscopy, Confocal Raman Spectroscopy, and X-ray based techniques, the effect of varying metal: extract stoichiometry, temperature, and stirring on controlling the shape and size of the nanoparticles has been studied. Increase in reaction temperature is seen to favour speedier formation of nanoparticles, and of smaller average size, than occurs at ambient temperatures (27±2°C). Higher extract: metal ratios also lead to nanoparticles of larger average size. When Ag (I) and Au (III) salts are used in equal molar ratios, it generates sphere-shaped nanoparticles. All-in-all, the present work offers a non-polluting, energy saving, and cost effective route for the fabrication of bimetallic Au-Ag nanoparticles. The study indirectly provides a means of controlling ipomoea, thereby offering a means to reduce the ecological degradation that is caused by the weed.

Effect of Inert Annealing Gases on Morphology of Gold Nanoparticles Produced by Using Rapid Thermal Annealing

2019 ◽  
Vol 57 ◽  
pp. 7-16
Author(s):  
Tung Thanh Bui ◽  
Tien Minh Huynh ◽  
Thuy Thanh Tieu ◽  
Chien Mau Dang
Keyword(s):  
Gold Nanoparticles ◽  
Electrical Properties ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Metallic Nanoparticles ◽  
Strong Influence ◽  
Silicon Substrates ◽  
Optical And Electrical Properties ◽  
Potential Applications ◽  
Spherical Gold Nanoparticles

Metallic nanoparticles have various potential applications. Recent studies have showed that their morphology had a strong influence on their optical and electrical properties. In this work, rapid thermal annealing was used to produce gold nanoparticles on silicon substrates. Morphology control of the gold nanoparticles was made by changing inert annealing gases. Spherical gold nanoparticles were obtained with nitrogen while hemispherical gold nanoparticles were formed with argon.

Green Synthesis of Gold Nanoparticles Using Longan Polysaccharide and their Reduction of 4-nitrophenol and Biological Applications

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050002 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Liyuan Fan ◽  
Yanshuai Cui ◽  
Tianming Cui ◽  
Shengfu Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Metallic Nanoparticles ◽  
High Catalytic Activity ◽  
Synthetic Method ◽  
Biological Applications ◽  
Au Nps ◽  
Stabilizing Agents ◽  
Highly Dispersed ◽  
Negative Zeta Potential

The green synthesis of gold nanoparticles (Au NPs) for catalytic and biological applications has been drawing great attention. To compare with plant extracts, the polysaccharides may be good reducing and stabilizing agents. In this work, we describe the preparation of longan polysaccharide stabilized gold nanoparticles (Aun-LP NPs) by reduction of gold ions using a green synthetic method. The formation of gold nanoparticles (Au NPs) was confirmed by UV-Vis spectra. TEM showed that Au NPs had a small size (7.8–15.6[Formula: see text]nm) and were highly dispersed without any aggregation. XPS confirmed that the surface elemental composition of Aun-LP NPs was C, O, and Au. DLS demonstrated that Aun-LP NPs had good stability and negative zeta potential. In addition, Aun-LP NPs had high catalytic activity for the reduction of 4-nitrophenol. More importantly, Aun-LP NPs had ignorable cytotoxicity towards HeLa cells and showed good antioxidant activity. Taken together, the results indicated that longan polysaccharide can be used as reducing agents and stabilizers for the preparation of metallic nanoparticles, and the product had wide applications.

Catalyst-free and environment friendly synthesis of 2-aryl-3-substituted-4-thiazolidinones in water

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28619-28623 ◽  
Author(s):  
Manoj P. Thakare ◽  
Rahimullah Shaikh ◽  
Dipak Tayade
Keyword(s):  
Cost Effective ◽  
One Pot ◽  
Environment Friendly ◽  
Catalyst Free ◽  
One Pot Synthesis ◽  
Cost Effective Method

A simple, efficient, eco-friendly, and cost-effective method has been developed for the three component one pot synthesis of 2-aryl-3-substituted-4-thiazolidinones is described.

One-Step Synthesis of Stable Gold Nanoparticles on Eco-friendly Ionic Liquid

2012 ◽  
Vol 1386 ◽  
Author(s):  
P Anantha ◽  
Xiu Wang ◽  
C.C. Wong
Keyword(s):  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
Metallic Nanoparticles ◽  
Thermal Evaporation ◽  
Processing Technique ◽  
Nanoparticle Dispersion ◽  
Thermal Evaporation Method ◽  
Stabilizing Agents ◽  
Transmission Electron ◽  
The Difference

ABSTRACTMetallic nanoparticles are often obtained by chemical decomposition or reactive techniques involving the extensive usage of harmful reducing or stabilizing agents. A facile green synthesis technique resulting in readily exploitable nanoparticle dispersion in ionic liquid without the use of any additional agents is reported here. 1-Propyl- 3- Methyl Imidazolium Iodide (PMIM(I)) is a non-volatile, thermally stable and non-toxic ionic liquid. This eco-friendly liquid is used as the substrate for thermal evaporation of gold to obtain stable gold nanoparticles. On being examined by Transmission Electron Microscopy the high monodispersity in their sizes was revealed. The byproduct free, ‘clean’ processing technique helps in obtaining un-contaminated particles. The thermal evaporation method used (for the generation of metallic vapor) plays a significant role in the difference in kinetics of the formation and growth of nanoparticles, unlike the widely reported sputtering technique for vapor generation. The formed particles are deposited only on the top surface of the liquid. Thus the nucleation and growth of the particles can be considered to have occurred by surface diffusion process only. A deeper investigation into the formation kinetics has the potential application for synthesizing other nanomaterials via this environmental friendly approach.

scholarly journals Green Synthesis of Gold Nanoparticles Using Polianthes tuberosa L. Floral Extract

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2370
Author(s):  
Mousa A. Alghuthaymi ◽  
Chandrasekaran Rajkuberan ◽  
Thiyagaraj Santhiya ◽  
Ondrej Krejcar ◽  
Kamil Kuča ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metallic Nanoparticles ◽  
Antagonistic Activity ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Potential Applications ◽  
Uv Visible ◽  
Dose Dependent ◽  
Mcf 7

The developments of green-based metallic nanoparticles (gold) are gaining tremendous interest, having potential applications in health care and diagnosis. Therefore, in the present study, Polianthes tuberosa flower filtered extract was used as a reducing and stabilizing agent to synthesize gold nanoparticles (PtubAuNPs). The PtubAuNPs were extensively characterized by UV–visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and X-ray diffraction. The antibacterial activity of PtubAuNPs was determined by the agar well diffusion method; the PtubAuNPs performed extreme antagonistic activity against the tested pathogens. Furthermore, the cytotoxicity of the PtubAuNPs was evaluated in MCF 7 cells by MTT assay. The PtubAuNPs induced toxicity in MCF 7 cells with the least concentration of 100 µg/mL in a dose-dependent method by inducing apoptosis. Overall, the study manifested that PtubAuNPs are a potent nanomaterial that can be employed as an antimicrobial and anticancer agent.

HOTPLATE TECHNIQUE FOR NANOMATERIALS

COSMOS ◽  
2008 ◽  
Vol 04 (02) ◽  
pp. 235-255 ◽  
Author(s):  
YANWU ZHU ◽  
CHORNG HAUR SOW
Keyword(s):  
Gas Sensors ◽  
Cost Effective ◽  
Optical Devices ◽  
Li Ion Batteries ◽  
Ultrafast Optical ◽  
Cost Effective Method ◽  
Material Systems ◽  
Potential Applications ◽  
Direct Preparation ◽  
Li Ion

As an efficient and cost-effective method to synthesize nanomaterials, the hotplate technique has been reviewed in this article. Systematic studies have been carried out on the characterizations of the materials synthesized. In addition to the direct preparation of nanomaterials on metals, this method has been extended to the substrate-friendly and plasma-assisted hotplate synthesis. Apart from chemically pure nanostructures, a few nanohybrids were synthesized, further demonstrating the flexibility of this technique. The investigations on their applications indicate that they are promising material systems with potential applications in field emission devices, gas sensors, Li -ion batteries and ultrafast optical devices.

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