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Science and Technology of Dyes and Pigments for Imaging Applications - various colors arising from polymorphs in organic pigments -

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Dyes and pigments play a crucial role as the colorants in the imaging areas. In the period of black & white copies, organic pigments have extensively been studied as photoconductors for electrophotographic photoreceptors. However, nowadays, pigments have more and more attracted attention as colorants, not only for color copies based upon the electrophotographic process, but also for inkjet printers. The color of the dyestuff is mostly determined by its molecular structure; whereas that of pigments arises from the molecular structure as well as intermolecular interactions in the solid states. Therefore, the color of pigments can be influenced by molecular arrangement, i.e., crystal structure. In present keynote, I begin with a brief introduction about the difference between dyes and pigments in general and then talk about the intermolecular interactions in the solid state from the standpoint of the crystal structure. I will also introduce you a variety of polymorphs in pigments that are isolated as single crystals and discuss some representative factors which induce phase transition, leading to different colors.
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Document Type: Research Article

Publication date: 01 January 2007

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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