Fibrillar Porous Material for High Opacity
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Solution Overview
Problem
Existing materials used for opacity and whiteness, such as titanium dioxide, have negative health and environmental impacts, and achieve opacity through thick layers or brittle inorganic aerogels, which are not suitable for edible or dermatological applications.
Innovation Solution
A highly scattering material based on fibrillar, elongated, or disk-like particles, such as cellulose nanofibrils, is created with an optimized particle size, refractive index, and spatial arrangement to achieve maximal scattering and opacity in thin layers, using a process that maintains porosity and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium dioxide or zinc oxide particles are used to achieve opacity and whiteness, then the optical property is improved, but health and environmental safety deteriorates
Solution Approach 1:
The patent replaces harmful inorganic particles (titanium dioxide, zinc oxide) with biodegradable organic particles made from plant or animal materials. These organic particles achieve the same opacity function without the toxic health effects, effectively substituting a harmful short-living inorganic material with a safe biodegradable alternative.
Solution Approach 2:
The patent changes the fundamental parameter of particle material composition from inorganic (titanium dioxide, zinc oxide) to organic (plant or animal-based particles). This parameter change maintains the optical scattering function while eliminating the harmful health effects associated with inorganic particles.
2Illumination intensity
If inorganic aerogels are used to achieve opacity in thin layers, then the optical property is improved, but mechanical strength and brittleness worsen
Solution Approach 1:
The patent changes the material composition parameter from inorganic aerogel to organic particles derived from plant or animal materials. This transformation maintains the ability to achieve opacity in thin layers while fundamentally improving mechanical properties by eliminating the inherent brittleness of inorganic aerogels.
3Illumination intensity
If thick layers of material are used to achieve opacity, then the optical property is improved, but material quantity and processing complexity increase
Solution Approach 1:
The patent changes the particle composition parameter to organic materials with optimized optical scattering properties, enabling achieving the same opacity effect in thinner layers compared to conventional inorganic particle systems, thereby reducing overall material quantity required.
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 material achieves strong light scattering and opacity in thin layers, reducing the need for thick materials or harmful additives, and is suitable for applications in paper, cosmetics, and edible products due to its non-toxic and biocompatible nature.
Implementation Method 1
Propagation of light through a medium with a varying refractive index leads to scattering, and this scattering becomes most efficient when these variations in refractive index occur in structures with sizes comparable to the wavelength of light.
Data Source
AI summary
The present invention concerns a material, based on fibrillar, elongated, or disk-like colloidal particles, that has a high scattering efficiency, a method that is suitable for preparing such a material, and the use of such a material. The material can be used as, or as a part of, a pigment, paint or protective coating in various industries, but due to its high scattering, and due to the fact that the material appears white even as a thin membrane, it is an interesting option also in the paper and pulp, cosmetic and medical industries.