Magnetically separable titanium-silicate mesoporous materials with core–shell morphology: synthesis, characterization and catalytic properties

2009 ◽  
Vol 19 (39) ◽  
pp. 7332 ◽  
Author(s):  
Marina V. Barmatova ◽  
Irina D. Ivanchikova ◽  
Oxana A. Kholdeeva ◽  
Alexander N. Shmakov ◽  
Vladimir I. Zaikovskii ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Catalytic Properties ◽  
Shell Morphology ◽  
Core Shell ◽  
Titanium Silicate ◽  
Magnetically Separable

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.

PtPd nanoframes derived from Pd@PdPt core–shell rhombic dodecahedrals with excellent catalytic performance toward methanol oxidation

2021 ◽  
Author(s):  
Yangyang Ren ◽  
Chuanliang Li ◽  
Baosong Li ◽  
Fan Gao ◽  
Xinghua Zhang ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Catalytic Properties ◽  
Catalytic Performance ◽  
Core Shell ◽  
Acid Environment ◽  
Excellent Catalytic Performance

PtPd nanoframes with excellent catalytic properties were obtained by etching Pd@PdPt core–shell RDs with Fe3+ in an acid environment.

scholarly journals Shape-dependent exchange bias effect in magnetic nanoparticles with core-shell morphology

2015 ◽  
Vol 92 (6) ◽  
Author(s):  
V. Dimitriadis ◽  
D. Kechrakos ◽  
O. Chubykalo-Fesenko ◽  
V. Tsiantos
Keyword(s):  
Magnetic Nanoparticles ◽  
Exchange Bias ◽  
Shell Morphology ◽  
Core Shell ◽  
Bias Effect ◽  
Exchange Bias Effect

Synthesis of polyaniline–magnetite nanocomposites using swollen liquid crystal templates for magnetically separable dye adsorbent applications

2018 ◽  
Vol 42 (8) ◽  
pp. 5709-5719 ◽  
Author(s):  
S. Dutt ◽  
T. Vats ◽  
P. F. Siril
Keyword(s):  
Liquid Crystal ◽  
Iron Oxide ◽  
Core Shell ◽  
External Magnet ◽  
One Dimensional ◽  
Shell Nanostructures ◽  
Magnetically Separable

One dimensional iron oxide–polyaniline core–shell nanostructures enable faster adsorption of dyes and separation of the adsorbent using an external magnet.

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