Exfoliated Clay Surfactant Complex Inhibits Microorganisms
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Solution Overview
Problem
Existing materials for inhibiting microorganisms and viruses, such as nanosilicate platelets, are prone to aggregation due to electrical properties that vary with pH, making them unsuitable for effective use.
Innovation Solution
A complex of exfoliated clay and surfactants, specifically nanosilicate platelets combined with cationic, nonionic, or anionic surfactants, is developed to inhibit microorganisms and plant pests, with a weight ratio of exfoliated clay to surfactant ranging from 99/1 to 1/99, preventing self-aggregation and maintaining effectiveness across different pH levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanosilicate platelets are used to inhibit microorganisms and viruses, then high surface area and strong charges provide effective inhibition, but aggregation occurs below the isoelectric point due to positive electrical properties
Solution Approach 1:
The patent introduces a surfactant as an intermediary substance between nanosilicate platelets and the environment. The surfactant adsorbs onto the platelet surfaces, forming a protective layer that prevents direct interaction between positively charged plates below the isoelectric point, thereby preventing aggregation while maintaining inhibition effectiveness.
Solution Approach 2:
The patent creates a composite material system combining nanosilicate platelets with surfactants. This composite structure leverages the high surface area and charge properties of nanosilicate for microbial inhibition while the surfactant component provides steric and electrostatic stabilization to prevent aggregation across different pH conditions.
2Reliability
If exfoliated clay is used alone, then high aspect ratio provides good inhibition properties, but pH-dependent electrical properties cause aggregation below isoelectric point
Solution Approach 1:
The patent modifies the surface properties of exfoliated clay by introducing surfactants, which changes the electrical and steric parameters of the platelets. This modification allows the material to maintain stable dispersion and effectiveness across a broader pH range, including conditions below the isoelectric point where unmodified clay would aggregate.
3Reliability
If conventional pesticides and preservatives are used to inhibit microorganisms, then effective inhibition is achieved, but toxicity to human bodies and environmental damage occur
Solution Approach 1:
The patent changes the fundamental parameters of the inhibitory material from conventional chemical pesticides to nanosilicate platelets with dimensions in the range of 100×100×1 nm³. These nanoscale physical properties provide microbial inhibition through mechanisms such as physical disruption and charge interaction, avoiding the toxic chemical effects of conventional pesticides while maintaining 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 exfoliated clay/surfactant complex effectively inhibits the growth of microorganisms and plant pests without aggregation, promoting environmental safety and agricultural benefits, while also balancing soil pH and enhancing plant growth.
Implementation Method 1
nanosilicate platelets (NSPs) achieved by exfoliating clay are also considered due to their high aspect ratio (averagely, 100×100×1 nm3), high surface areas (700 to 800 m2/g) and strong charges (ca. 20,000 ions per platelet)
Data Source
AI summary
The present invention provides a method for inhibiting microorganisms or plant pests using exfoliated clay/surfactant complex. The weight ratio of the exfoliated clay to the surfactant can range from 99/1 to 1/99. Preferably, the exfoliated clay is an inorganic layered clay on a nano scale and the surfactant is cationic, nonionic, anionic or amphoteric.