Zinc Oxide Nanocomposites Using Poly Ionic Liquid
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Solution Overview
Problem
Zinc oxide nanoparticles face rapid recombination of photo-generated electron-hole pairs when used as photocatalysts in water treatment processes, limiting their effectiveness in removing pollutants.
Innovation Solution
The synthesis of zinc oxide nanocomposites using poly(ionic liquid) involves combining zinc oxide with poly(ionic liquid) solutions, adjusting pH, and heating to form stable zinc oxide nanoparticles, which are then polymerized and cured to create a zinc oxide polymer nanocomposite with improved stability and photocatalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zinc oxide is used as a photocatalyst in water treatment processes, then it can remove toxic dyes and pigments, but photo-generated electron-hole pairs recombine rapidly reducing effectiveness
Solution Approach 1:
The patent creates a composite material by combining zinc oxide nanoparticles with poly(ionic liquid) to form a stabilized nanocomposite. The poly(ionic liquid) acts as a capping agent that coats the ZnO nanoparticle surface, preventing aggregation and providing a functional layer that reduces electron-hole recombination, thereby maintaining photocatalytic activity while improving stability and effectiveness in water treatment applications
Solution Approach 2:
The poly(ionic liquid) serves as an intermediary substance between the zinc oxide nanoparticles and the aqueous environment. It coordinates with the ZnO surface and provides a protective interface that slows down electron-hole recombination while allowing the photocatalytic function to operate effectively in water treatment processes
2Reliability
If ionic liquids are used as capping agents for nanomaterials, then they provide stabilization and controlled particle sizes, but literature usage as reducing agents for metal oxide preparation is limited
Solution Approach 1:
The patent changes the functional parameters of the ionic liquid by polymerizing it to form poly(ionic liquid). This transformation enables the material to simultaneously act as both a capping agent for stabilization and a reducing agent for ZnO nanoparticle formation, overcoming the limitation of conventional ionic liquids that are primarily used only as capping agents
Solution Approach 2:
The poly(ionic liquid) achieves multi-functionality by combining the properties of ionic liquids (stabilization, low toxicity, high water dispersion) with polymer characteristics (reducing capability, structural stability). This universal material can now serve multiple roles in the synthesis and stabilization of ZnO nanocomposites, expanding the ease of manufacture for such materials
Data Source
AI summary
The method of synthesizing zinc oxide polymer nanocomposite comprises: dissolving equal molar ratios of a sulfonic acid acrylic monomer and a co-monomer with a cross linking agent to form a solution; dispersing the zinc-oxide nanoparticles into the solution; polymerizing the sulfonic acid acrylic monomer with the co-monomer by adding a free radical initiator followed by heating up the solution to a temperature up to 50° C.; raising the temperature up to 60° C. until a zinc oxide polymer nanocomposite is formed; and curing the nanocomposite by heating to at least 105° C. for about 24 hours to form the zinc oxide polymer nanocomposite, wherein the ionic liquid monomer is 2-ccrylamido-2-methyl-1-propanesulfonic acid or a salt thereof and wherein the co-monomer is selected from the group consisting of vinyl pyrrolidone, acrylic acid and N-isopropyl acrylamide monomers.