Novel modification method of yellow pigment and its potential application in e-ink

摘要

Yellow SiO2/Hansa pigment composite particles were fabricated in an aqueous solution bynelectrostatic self-assembly method, in which cetyltrimethylammonium bromide was used as ancoupling agent to give the yellow pigment particles a positive charge. Then, a thin shell of SiO2nwas coated during the process of hydrolysis of Na2SiO3 to enhance the optical and mechanicalnproperties as well as the charge load of the pigment particles. The product was characterised byntransmission electron microscopy and thermogravimetric analysis, which showed that the SiO2nwalls of the composite particles were compact. Fourier transform infrared spectroscopy showednthe component of the composite particles. Zeta potential measurement proved that the SiO2pigment particles had a higher charge load, and ultraviolet–visible spectra showed that the SiO2pigment particles had a better optical property. Therefore, this type of composite particle had thenmerits of low density and strong durability in environments. The response behaviour of thenmicroencapsulated electronic ink of the composite particles has been measured. This novelnmethod is expected to produce various inorganic/organic nanocomposite particles with potentialnapplication in the fields of electronic paper and other material sciences.