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Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Updated: May 1, 2026

Generation of Zerovalent Metal Core Nanoparticles Using n-2-aminoethyl-3-aminosilanetriol

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Published on: February 11, 2016

Biosynthesis of silver nanoparticles.

Subin Poulose, Tapobrata Panda, Praseetha P Nair

Journal of Nanoscience and Nanotechnology

|April 23, 2014

Summary

Biosynthesis offers an eco-friendly method for producing silver nanoparticles using microorganisms. This approach avoids hazardous chemicals and high temperatures, enabling control over nanoparticle size and shape for various applications.

Area of Science:

Nanotechnology
Biotechnology
Materials Science

Background:

Traditional metal nanoparticle synthesis involves hazardous chemicals and high temperatures, often resulting in undesired morphology and low yields.
Bioremediation techniques utilizing microorganisms or their components offer an environmentally friendly alternative for nanoparticle production.
These biological methods operate at ambient temperatures and pressures, allowing for better control over nanoparticle characteristics.

Purpose of the Study:

To review the biosynthesis of silver nanoparticles (AgNPs) using various biological organisms.
To elucidate the potential mechanisms underlying the synthesis of these nanoparticles.
To discuss the characterization techniques and diverse applications of biosynthesized AgNPs.

Main Methods:

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Exploration of literature on microbial synthesis of silver nanoparticles.
Analysis of mechanisms involved in the bioconversion of silver ions (Ag+) to nanoparticles.
Review of characterization methods such as UV-visible spectroscopy and electron microscopy.
Compilation of data on the applications of silver nanoparticles.

Main Results:

Microorganisms like bacteria, fungi, and algae can effectively synthesize silver nanoparticles.
The synthesis process involves bioconversion of Ag+ ions, formation of desired crystal structures, and stabilization of nanoparticles.
Control over nanoparticle size and shape is achievable by adjusting pH and temperature.
Characterization confirms the formation and properties of silver nanoparticles.

Conclusions:

Biosynthesis provides a sustainable and efficient route for producing silver nanoparticles.
Silver nanoparticles exhibit significant antimicrobial, antifungal, anti-inflammatory, and anti-angiogenic properties.
Further research into biosynthesis mechanisms and applications holds promise for advancing nanotechnology and medicine.