4.6 Article

Alumina nanocoating assisted dispersion stability of permanent violet pigments via atomic layer deposition

期刊

MATERIALS CHEMISTRY AND PHYSICS
卷 282, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.125937

关键词

Permanent violet; Coating; Surface modification; Dispersion stability; Atomic layer deposition

资金

  1. National Key R&D Program of China [2020YFB2010400]
  2. National Natural Science Foundation of China [51835005, 51911540476, 51801067]
  3. Fundamental Research Funds for the Central Universities, HUST [2018KFYYXJJ031, 2020kfyXJJS100]
  4. Tencent Foundation

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In this study, a few-nanometres-thick inorganic film coating layer was prepared using atomic layer deposition (ALD) method to improve the dispersion stability of permanent violet pigments. The results showed that this surface modification method can enhance the dispersion of the pigments and promote their applications in the electronic colouration industry.
Permanent violet is an organic pigment that is extensively applied in the colourant industry, wherein excellent dispersion ability and stability of organic pigments in a solution is required. Therefore, surface modification of organic pigments significantly impacts their application performance. Herein, a few-nanometres-thick inorganic film coating layer via atomic layer deposition (ALD) method has been prepared for surface modification of permanent violet pigments, which enhances the pigments' dispersion stability. Uniform coatings comprising individual particles (rather than agglomerates) are confirmed by morphology, specific surface area and particle size distribution characterizations. The UV-Vis absorbance results indicate 20 cycles of Al2O3 coated permanent violet pigments exhibit excellent stability when dispersed in ethanol solvent, which is attributed to the electrostatic stabilization of Al2O3 coatings. The ultrathin film coating provides an effective method of improving the dispersion stability of organic pigments, which can promote the applications in electronic colouration industry.

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