scholarly journals Ultrasonic assisted synergetic green synthesis of polycyclic imidazo(thiazolo)pyrimidines by using Fe3O4@clay core-shell

2017 ◽  
Vol 38 ◽  
pp. 585-589 ◽  
Author(s):  
Ali Maleki ◽  
Morteza Aghaei
Keyword(s):  
Green Synthesis ◽  
Core Shell ◽  
Ultrasonic Assisted ◽  
Clay Core

scholarly journals Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1007
Author(s):  
Azam Ali ◽  
Mariyam Sattar ◽  
Fiaz Hussain ◽  
Muhammad Humble Khalid Tareen ◽  
Jiri Militky ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Tannic Acid ◽  
Rate Constant ◽  
Catalytic Properties ◽  
Colloidal Dispersion ◽  
Alkaline Condition ◽  
Core Shell ◽  
Average Particle ◽  
Ag Nps

The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of silver nanoparticles (Ag NPs) was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized Ag NPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) Ag NPs, capped with poly-tannic acid (Ag NPs-PTA). The average particle size of Ag NPs-PTA was found to be 9.90 ± 1.60 nm. The colloidal dispersion of synthesized nanoparticles was observed to be stable for more than 15 months in the ambient environment (25 °C, 65% relative humidity). The synthesized AgNPs-PTA showed an effective antimicrobial activity against Staphylococcus Aureus (ZOI 3.0 mM) and Escherichia coli (ZOI 3.5 mM). Ag NPs-PTA also exhibited enhanced catalytic properties. It reduces 4-nitrophenol into 4-aminophenol in the presence of NaBH4 with a normalized rate constant (Knor = K/m) of 615.04 mL·s−1·mg−1. For comparison, bare Ag NPs show catalytic activity with a normalized rate constant of 139.78 mL·s−1·mg−1. Furthermore, AgNPs-PTA were stable for more than 15 months under ambient conditions. The ultra-high catalytic and good antimicrobial properties can be attributed to the fine size and good aqueous stability of Ag NPs-PTA. The unique core-shell structure and ease of synthesis render the synthesized nanoparticles superior to others, with potential for large-scale applications, especially in the field of catalysis and medical.

Facile and Green Synthesis of Core–Shell Structured Magnetic Chitosan Submicrospheres and Their Surface Functionalization

Langmuir ◽  
2013 ◽  
Vol 29 (37) ◽  
pp. 11770-11778 ◽  
Author(s):  
Yiya Li ◽  
Dongying Yuan ◽  
Mingjie Dong ◽  
Zhihua Chai ◽  
Guoqi Fu
Keyword(s):  
Green Synthesis ◽  
Surface Functionalization ◽  
Core Shell ◽  
Magnetic Chitosan

A facile green synthesis of type II water soluble CdTe/CdS core shell nanoparticles

2014 ◽  
Vol 133 ◽  
pp. 9-13 ◽  
Author(s):  
Oluwatobi.S. Oluwafemi ◽  
Olamide A. Daramola ◽  
Vuyelwa Ncapayi
Keyword(s):  
Green Synthesis ◽  
Water Soluble ◽  
Core Shell ◽  
Type Ii ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Ultrasonic-Assisted Synthesis, Characterization, and Photocatalytic Application of SiO2@TiO2 Core-Shell Nanocomposite Particles

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Newaz Mohammed Bahadur ◽  
Farhana Chowdhury ◽  
Md. Obaidullah ◽  
Md. Shahadat Hossain ◽  
Rumana Rashid ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Metal Oxide ◽  
Uv Light ◽  
Water Solution ◽  
Ultrasound Irradiation ◽  
Blue Dye ◽  
Core Shell ◽  
Nanocomposite Particles ◽  
Ultrasonic Assisted ◽  
Shell Particles

In this study, we report the synthesis of SiO2@TiO2 core-shell nanocomposite particles by ultrasound irradiation of a mixture of dispersed SiO2 nanoparticles, titanium-tetra-n-butoxide (TBOT), and ammonia in an ethanol-water solution medium. The resulting core-shell nanocomposite particles were characterized by SEM, TEM, FT-IR, XPS, XRF, zeta potential measurements, XRD, and UV-visible spectroscopy. Results showed that TiO2 nanoparticles coated on the surface of SiO2 were 6–10 nm in size and retained an anatase crystalline phase. Zeta potential measurements confirmed that the surface property of the SiO2 changed after TiO2 coating. SiO2@TiO2 core-shell particles demonstrated better decolorization of methylene blue dye compared to commercial TiO2 in aqueous solution under UV light. After treatment, the catalysts were separated with low-speed centrifugation and successfully reused four times without loss of activity. This study may provide some inspiration for the synthesis of other metal oxide-metal oxide core-shell nanocomposite materials through ultrasound irradiation.

Green synthesis of Au, Pd and Au@Pd core–shell nanoparticles via a tryptophan induced supramolecular interface

RSC Advances ◽  
2013 ◽  
Vol 3 (40) ◽  
pp. 18367 ◽  
Author(s):  
Sarvesh Kumar Srivastava ◽  
Takashi Hasegawa ◽  
Ryosuke Yamada ◽  
Chiaki Ogino ◽  
Minoru Mizuhata ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles
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