Methods and systems for monitoring and controlling surfactant concentration in liquid crystal colloidal dispersions
US8308977B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2009 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Oct 6, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2019/521
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There are provided methods and systems for precisely controlling the surfactant concentration and character of ferroelectric nanoparticles in a ferroelectric liquid crystal dispersion. In an aspect, the invention provides an efficient FTIR technique to characterize the status and measure the distribution of the surfactant in ferroelectric particle dispersion. This allows for establishing a reproducible fabrication process for ferroelectric nanoparticle liquid crystal dispersions. The methods also maintain the nanoparticles ferroelectricity, which is provided by the addition of surfactant during a comminution process. The invention therefore optimizes both the milling time (to achieve small particle size and narrow size distribution) and surfactant concentration (to maintain the ferroelectricity during milling).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.