Sonochemical coating method
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Solution Overview
Problem
Current methods for preparing antibacterial, antimicrobial, or antifungal surfaces are inefficient, require additional binding agents, and involve high-energy radiation or thermal curing, limiting their versatility and stability.
Innovation Solution
A sonochemical coating method using ultrasonic waves to embed or deposit metal oxide nanoparticles onto substrates without binding agents, allowing for in-situ formation or pre-existing nanoparticle use, providing a fast, cost-effective, and versatile coating process that anchors nanoparticles firmly onto surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high energy radiation and thermal curing are used to deposit metal oxide nanoparticles on substrates, then antimicrobial activity is achieved, but process complexity and energy consumption increase
Solution Approach 1:
The patent replaces high energy radiation (electromagnetic field) and thermal curing (thermal field) with ultrasonic waves (acoustic field) to deposit metal oxide nanoparticles. The ultrasonic cavitation effect creates localized high energy zones that enable nanoparticle embedding without requiring complex radiation equipment or thermal curing processes, thus simplifying the overall system while maintaining antimicrobial effectiveness
Solution Approach 2:
The patent changes the energy delivery parameters from high energy radiation and high temperature to ultrasonic frequency vibrations. By controlling ultrasonic power (typically 20-100 W/cm²) and exposure time (minutes to hours), the process achieves nanoparticle deposition at ambient or mild temperatures, reducing energy consumption and process complexity while maintaining reliable antimicrobial activity
2Stability of the object's composition
If binding agents and dispersing agents are added to achieve nanoparticle deposition, then coating stability improves, but additional chemical substances and process steps are required
Solution Approach 1:
The patent extracts and eliminates binding agents and dispersing agents from the nanoparticle deposition process. Instead of using chemical additives to stabilize the coating, the method relies on ultrasonic cavitation to create mechanical embedding of nanoparticles directly into the substrate surface, achieving stable coating without any additional chemical substances
Solution Approach 2:
The substrate surface itself serves as the anchoring mechanism for nanoparticles through ultrasonic cavitation. The cavitation bubbles collapse near the substrate surface, creating microjets and shockwaves that drive nanoparticles into the substrate pores or onto the surface, where they become mechanically anchored. This self-anchoring mechanism eliminates the need for external binding agents
3Duration of action of stationary object
If multiple process steps including thermal curing are used for nanoparticle fixation, then coating durability improves, but preparation time increases
Solution Approach 1:
The patent skips the thermal curing step entirely by using ultrasonic cavitation for direct nanoparticle embedding. The ultrasonic energy creates immediate mechanical anchoring of nanoparticles through cavitation bubble collapse, eliminating the need for subsequent thermal treatment. This rushes through the process by achieving fixation in a single step, reducing preparation time while maintaining coating durability
Solution Approach 2:
The patent merges nanoparticle deposition and fixation into a single ultrasonic treatment step. The ultrasonic cavitation simultaneously deposits nanoparticles from the suspension and anchors them to the substrate surface through mechanical embedding, combining what were previously separate steps (deposition followed by thermal curing) into one integrated process, thereby reducing total preparation time
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 method achieves stable and homogeneous nanoparticle distribution on various substrates, demonstrating outstanding antimicrobial activity with high stability through 50-65 washing cycles, suitable for diverse materials and applications.
Implementation Method 1
According to the predominant explanation the embedding and/or the depositing of the nanoparticles is a result of acoustic bubbles being formed in the mixture by the ultrasonic waves in the sonochemical coating method. The acoustic bubbles tend to collapse preferentially near the surface, in particular near a solid surface, of a substrate.
Implementation Method 2
The present invention relates to a sonochemical coating method, in particular for preparing antibacterial, antimicrobial or antifungal surfaces.
Implementation Method 3
The collapse of the acoustic bubbles provides the energy for forming the metal oxide nanoparticles.
Data Source
AI summary
In order to provide an efficient, fast, versatile and reliable method for preparing antibacterial, antimicrobial or antifungal surfaces a sonochemical coating method, in particular for preparing antibacterial, antimicrobial or antifungal surfaces, is proposed, comprising the steps of - providing a mixture comprising water, - immersing a substrate in the mixture, - Embedding metal oxide nanoparticles contained/or formed in the mixture in a surface of the substrate and/or depositing metal oxide nanoparticles contained and/or formed in the mixture on a surface of the substrate by irradiating the mixture with ultrasonic waves.