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Sonochemical synthesis of silver nanoparticles using starch: a comparison.
Brajesh Kumar1, Kumari Smita1, Luis Cumbal1
1Centro de Nanociencia y Nanotecnologia, Universidad de las Fuerzas Armadas (ESPE), Sangolqui, Ecuador.
Bioinorganic Chemistry and Applications
|March 4, 2014
Summary
Researchers developed a novel method to create silver nanoparticles using starch and sonication. These nanoparticles, ranging from 23-97 nm, are suitable for synthesizing compounds with biomedical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Green Chemistry
Background:
- Silver nanoparticles (AgNPs) possess unique properties and diverse applications.
- Conventional synthesis methods may involve harsh chemicals or complex procedures.
- Developing eco-friendly and efficient synthesis routes for AgNPs is crucial.
Purpose of the Study:
- To explore a novel, green sonochemical method for synthesizing silver nanoparticles using starch as a stabilizing agent.
- To characterize the synthesized silver nanoparticles and determine their physical properties.
- To investigate the potential application of these AgNPs in synthesizing biologically relevant compounds.
Main Methods:
- Sonication-assisted synthesis of silver nanoparticles using silver nitrate (AgNO3) and starch.
- UV-Vis spectroscopy to monitor the optical properties and particle formation.
- Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED) for morphological and structural analysis.
- Optimization of reaction parameters including starch concentration, pH, and sonication time.
Main Results:
- Colloidal silver nanoparticles solution showed increased absorption from 420 to 440 nm with increasing starch concentration.
- TEM and SAED analysis confirmed the formation of spherical, polydispersed, amorphous silver nanoparticles with sizes ranging from 23 to 97 nm (mean 45.6 nm).
- SAED patterns indicated a partially crystalline and amorphous nature of the synthesized AgNPs.
- Optimized conditions: 10 ml of 1 mM AgNO3, 25 mg starch, pH 11, and 20 min sonication at room temperature.
Conclusions:
- A facile, green, and efficient sonochemical method for synthesizing silver nanoparticles using starch has been successfully developed.
- The synthesized silver nanoparticles exhibit characteristics suitable for further applications.
- These starch-stabilized silver nanoparticles show potential for the synthesis of 2-aryl substituted benzimidazoles, compounds with significant biomedical relevance.
