Colloidal Antimicrobial Coating for Long-Term Biofouling Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current antimicrobial and anti-biofouling coatings lack long-term activity and are not suitable for both solid and porous surfaces, particularly in water-exposed applications such as filtration membranes, pipes, and textiles, where biofilm formation and fouling remain significant challenges.
Innovation Solution
Development of colloidal antimicrobial and anti-biofouling coatings comprising hollow round particles with an active polymer shell and an active or inert core, utilizing polymers like polyethylenimine, polyquaternium, and polyhexamethylene biguanide, stabilized with polyvinyl alcohol and polyethylene glycol derivatives, which provide wide-spectrum antimicrobial properties and prevent biofouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional antimicrobial coatings are applied to surfaces, then initial antimicrobial activity is achieved, but long-term activity and stability are insufficient
Solution Approach 1:
The patent embeds antimicrobial polymer shells within colloidal particle structures, creating a nested configuration where the active antimicrobial agents are contained within a stable colloidal matrix. This nesting provides both prolonged release (duration) and structural stability (reliability) simultaneously
Solution Approach 2:
The invention uses composite colloidal particles combining polymer shells with antimicrobial agents and stabilizing matrices. This composite structure integrates multiple functions: the polymer provides antimicrobial activity, the colloidal structure provides stability, and the composite nature enables both long-term activity and reliability
2Adaptability or versatility
If coatings are applied to porous surfaces like filtration membranes, then anti-biofouling protection is needed, but existing coatings are not suitable for both solid and porous surfaces
Solution Approach 1:
The colloidal particle formulation is designed to function universally on both solid and porous surfaces. The particles can be applied to filtration membranes, solid substrates, and textile fabrics, providing consistent anti-biofouling performance across different surface types through their adaptable colloidal structure
Solution Approach 2:
The patent specifically addresses porous surfaces by formulating colloidal particles that can penetrate and coat porous structures like filtration membranes effectively. The colloidal nature allows the particles to access and protect the porous internal structure, maintaining anti-biofouling reliability on porous substrates
3Reliability
If filtration membranes are used for water purification, then water purification is achieved, but biofouling and microbial colonization reduce performance and operational lifetime
Solution Approach 1:
The patent applies antimicrobial colloidal coatings to filtration membranes before they are exposed to contaminated water. This preliminary application of protective agents prevents microbial colonization from occurring in the first place, maintaining performance and extending operational lifetime by addressing the biofouling problem proactively
Solution Approach 2:
The antimicrobial coating provides preliminary anti-action against biofouling by creating a protective barrier that actively prevents microbial attachment and growth on the membrane surface. This preliminary protection counteracts the biofouling tendency before it can degrade membrane performance
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 coatings demonstrate sustained bactericidal activity and anti-biofouling performance, maintaining over 99.99% reduction in viable bacteria and preventing biofilm formation on various surfaces, including water filtration membranes and textiles, with stability for extended periods and resistance to water exposure.
Implementation Method 1
the active polymer shell comprises two and more polymers with antimicrobial and anti-biofouling activities selected from the group consisting of polyethylenimine (PEI), polyquaternium, poly(diallyldimethylammonium chloride) (PDDA) and polyhexamethylene biguanide (PHMB)
Implementation Method 2
the active polymer shell comprises two and more polymers with antimicrobial and anti-biofouling activities
Implementation Method 3
wherein the hollow round colloidal structure further comprises stabilizers and is stable for at least 3 months, and wherein the stabilizers are present in concentrations of 0.01-20% (w/v) of polyvinyl alcohol (PVA)
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
Methods and formulations for antimicrobial and anti-biofouling coating comprising: a hollow round colloidal structure, comprising: an active polymer shell; and an active or inert core; wherein the active polymer shell comprises one and more polymers with antimicrobial and anti-biofouling activities selected from the group consisting of polyethylenimine (PEI), functionalized chitosan (CHI), polyquatemium, poly(diallyldimethylammonium chloride) (PDDA) and polyhexamethylene biguanide (PHMD); wherein the active or inert core contains one and more disinfectants, biocides, fragrances or inert solvent; and wherein the hollow round colloidal structure is stable for at least 3 months.