Chromium-Substituted Copper Ferrite Nanoparticles for Surface Antimicrobials
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Solution Overview
Problem
There is a lack of effective methods for preventing or reducing microbial growth on surfaces using spinel ferrite nanoparticles, particularly for chromium-substituted copper ferrite, which are not well-documented in existing literature.
Innovation Solution
A method involving the synthesis of spinel ferrite nanoparticles with a chromium-substituted copper ferrite formula (CuCrxFe2-xO4) is developed, where x is greater than 0 and smaller than 2, by mixing copper(II) salt, chromium(III) salt, iron(III) salt, and an inorganic base, followed by heating and drying to produce nanoparticles with specific properties for application on surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromium-substituted copper ferrite nanoparticles are synthesized and applied to surfaces, then antimicrobial activity is improved, but manufacturing complexity increases due to multi-step synthesis process
Solution Approach 1:
The synthesis process is divided into distinct stages: co-precipitation of metal hydroxides, formation of spinel ferrite precursor, and final nanoparticle formation. This segmentation allows optimization of each step independently while maintaining overall process control and reproducibility
Solution Approach 2:
The patent systematically varies synthesis parameters including metal salt ratios (Cu:Cr:Fe), pH values (9-12), temperatures (40-180°C), and reaction times to optimize nanoparticle properties. Chromium substitution level (x in CuCrxFe2-xO4) is controlled within 0<x<2 to achieve desired antimicrobial activity while managing manufacturing complexity
2Reliability
If chromium substitution is increased in copper ferrite nanoparticles, then antimicrobial effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
Metal salts are pre-mixed in precise molar ratios before precipitation to ensure uniform chromium distribution. The precursor solution is prepared with controlled pH and composition, and the precipitation process is initiated under predetermined conditions to achieve consistent nanoparticle composition
Solution Approach 2:
The patent controls chromium substitution level (x) within specific ranges (0<x<2) and optimizes related parameters including pH (9-12), temperature (40-180°C), and metal salt concentrations to achieve desired compositional precision while maintaining antimicrobial effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The synthesized nanoparticles effectively inhibit microbial growth on surfaces, demonstrating antimicrobial activity against gram-negative bacteria like Escherichia coli, with reduced minimum inhibitory and bactericidal concentrations compared to similar nanoparticles lacking chromium substitution.
Implementation Method 1
mixing a copper(II) salt, a chromium(III) salt, an iron(III) salt, an inorganic base, and water to form a mixture, heating the mixture to form a precipitate
Implementation Method 2
heating the mixture to form a precipitate, and drying the precipitate, thereby producing the spinel ferrite nanoparticles
Data Source
AI summary
Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.