Influence of indigo-hydroxyl interactions on the properties of sepiolite-based Maya blue pigment
Influence of indigo-hydroxyl interactions on the properties of sepiolite-based Maya blue pigment
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DOI：
10.1016/j.dyepig.2022.110138
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发表时间：
2022-02-03
影响因子：
4.5
通讯作者：
Guo, Haozhe
中科院分区：
文献类型：
--
作者：
Li, Li;Zhuang, Guanzheng;Guo, Haozhe
玛雅蓝是一种蓝绿色的稳定颜料，由靛蓝和坡缕石或海泡石组成。以前的研究表明，玛雅蓝的性质受到粘土结构中不同羟基的影响，例如，沸石水、配位水和结构羟基。因此，本论文对靛蓝-海泡石杂化颜料的结构和性能进行了深入的研究。将海泡石材料在160、360、610和880 ° C下加热以除去沸石水、第一配位水、第二配位水和结构羟基。通过将靛蓝和海泡石材料的混合物在180 ℃下加热制备了一系列玛雅蓝模拟物。采用反射光谱法和CIE 1976颜色空间对混合颜料的颜色特性和色差进行了表征。评价了对浓HNO 3和二甲基亚砜（DMSO）的耐化学性以及在可见光下的光稳定性。采用微孔分析和傅里叶变换红外光谱研究了靛蓝-海泡石的相互作用。配位水对玛雅蓝的蓝绿色和优异的稳定性至关重要，而沸石水和结构羟基不影响颜料的性质。证实了靛蓝分子插入到海泡石孔道中，并在一侧与配位水形成氢键。结构羟基对于玛雅蓝的形成是无关紧要的。该研究为制备稳定的粘土-染料杂化颜料提供了指导。
Maya blue is a greenish-blue and stable pigment composed of indigo and palygorskite or sepiolite. Previous studies implied that the properties of Maya blue were influenced by different hydroxyl groups in the clay structure, e.g., zeolitic water, coordinated water, and structural hydroxyls. Therefore, an in-depth investigation was planned to analyze the structures and properties of indigo-sepiolite hybrid pigments in this work. Sepiolite materials were heated at 160, 360, 610, and 880 degrees C to remove zeolitic water, the first coordinated water, the second coordinated water, and structural hydroxyls. A series of Maya blue simulants were prepared by heating the mixture of indigo and sepiolite materials at 180 degrees C. Reflectance spectroscopy and CIE 1976 color space were employed to characterize color properties and color differences of hybrid pigments. Chemical resistance to concentrated HNO3 and dimethyl sulfoxide (DMSO), and photostability under visible light were evaluated. Microporous analysis and Fourier transform infrared spectroscopy were applied to study the indigo-sepiolite interaction. Coordinated water was essential for the greenish-blue color and outstanding stability of Maya blue, while zeolitic water and structural hydroxyls did not affect pigments' properties. Indigo molecules were confirmed to be inserted into sepiolite channels and formed hydrogen bonds with coordinated water at one side. Structural hydroxyls were insignificant for the formation of Maya blue. This work provides a guideline for preparing stable clay-dye hybrid pigments.