Nano Photocatalytic Sol Adhesion via Particle Shape
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Solution Overview
Problem
Current nano-photocatalytic sols face issues with adhesion to substrates, leading to peeling off of the coating layer, which reduces the service life and photocatalytic effectiveness, and the use of binders can compromise photocatalytic activity.
Innovation Solution
A nano-photocatalytic sol comprising a mixture of substantially spherical and non-spherical nano-photocatalysts with a partially non-crystalline photocatalytic material, forming a crisscross-linking and stacking structure that enhances adhesion and hardness without the need for binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nano-photocatalyst particles are immobilized on substrate to enable functionality, then photocatalytic activity is achieved, but adhesion between particles and substrate deteriorates causing coating peeling
Solution Approach 1:
The patent combines spherical and non-spherical nano-photocatalyst particles to form a composite coating structure. The non-spherical particles interlock with the substrate surface while spherical particles fill gaps, creating a mechanically interlocked composite structure that simultaneously achieves strong adhesion and maintains photocatalytic functionality without requiring organic binders.
Solution Approach 2:
The patent changes the shape parameter of nano-photocatalyst particles from purely spherical to include non-spherical forms with specific aspect ratios. This geometric parameter change enables mechanical interlocking with the substrate, transforming the adhesion mechanism from chemical bonding to physical interlocking, thereby improving both adhesion strength and photocatalytic activity.
2Strength
If organic additives are added to improve adhesion, then adhesion performance is enhanced, but chemical/physical incompatibility affects stability and functionality
Solution Approach 1:
The patent extracts and eliminates organic additives from the nano-photocatalytic sol formulation. By removing these problematic organic components, the patent avoids chemical incompatibility issues while maintaining adhesion performance through the physical interlocking mechanism of non-spherical particles, thereby preserving both adhesion and sol stability.
Solution Approach 2:
The non-spherical nano-photocatalyst particles serve as intermediaries between the substrate and the coating system. Instead of using organic additives as mediators for adhesion, the particle geometry itself acts as the mediating element, providing mechanical interlocking while maintaining chemical compatibility and sol stability.
3Strength
If adhesive agent layer is coated on substrate before nano-photocatalyst sol, then adhesion is increased, but manufacturing complexity increases and substrate material selection is limited
Solution Approach 1:
The patent merges the adhesion function and photocatalytic function into a single integrated coating layer. The non-spherical nano-photocatalyst particles simultaneously provide mechanical interlocking for adhesion and photocatalytic activity, eliminating the need for separate adhesive layers and simplifying the manufacturing process while expanding substrate compatibility.
Solution Approach 2:
The non-spherical nano-photocatalyst particles perform multiple functions: they provide mechanical interlocking for adhesion, fill gaps for uniform coverage, and maintain photocatalytic activity. This multi-functionality eliminates the need for specialized adhesive layers, reducing process complexity and expanding substrate material options.
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 solution results in a highly adhesive, hard, and effective photocatalytic coating with improved service life and photocatalytic activity, as demonstrated by enhanced adhesion, hardness, and hydrophilicity, while avoiding the limitations of binder use.
Implementation Method 1
the non-spherical nano-photocatalytic sol contains a non-spherical nano-photocatalyst and a partially non-crystalline photocatalyst material... forming a crisscross-linking and stacking structure that enhances adhesion
Implementation Method 2
The adhesion between the nano-photocatalytic particles and substrate after immobilization is the primary factor determining the service life of photocatalyst
Data Source
AI summary
The present invention relates to a nano-sized photocatalytic sol and application thereof. The invention utilizes spherical nano-photocatalyst and non-spherical photocatalytic sol for coating a photocatalyst layer on a substrate. Because of the stereo, interlaced and composite structure between spherical photocatalyst and non-spherical photocatalyst, a hard and well adhesion coated layer of photocatalyst with good photocatalytic activity can be obtained without using binder.