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首页> 外文期刊>RSC Advances >Thermal properties and surface chemistry of cotton varieties mineralized with calcium carbonate polymorphs by cyclic dipping
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Thermal properties and surface chemistry of cotton varieties mineralized with calcium carbonate polymorphs by cyclic dipping

机译：棉花品种的热性能和表面化学用循环浸渍用碳酸钙多晶型物矿化

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In this study, hydroentangled cotton nonwovens were identified as effective hosts for mineralization of calcium carbonate (CaCO _(3) ) polymorphs to modify and improve their properties. All cotton varieties studied, including raw white cotton, scoured white cotton, and raw brown cotton, readily crystallized CaCO _(3) via a simple cyclic dipping process. A combination of analyses agreed that the surface chemistry of cotton fibers influenced the formation of different CaCO _(3) polymorphs. Scoured white cotton that consisted of almost pure cellulose predominantly produced the most stable calcite, whereas raw white and raw brown cottons that contain proteins facilitated the production of partial metastable vaterite. The morphology of calcite was better defined on the scoured cotton. The mineralization altered the hydrophobic surface of raw cottons to be hydrophilic, i.e. , two-fold increase in moisture regain and decrease in water contact angle from 130 to 0 degrees. The mineralized cottons also exhibited improved thermal resistance, i.e. , slower thermal decomposition with decreased activation energies and reduction in heat release capacity by up to 40%.
机译：在本研究中，将水性棉花非织造织物鉴定为碳酸钙矿化的有效宿主（CaCO _（3））多晶型物，以改变和改善其性质。所有棉花品种都研究过，包括原料白色棉花，洗涤的白色棉花和原棕色棉，通过简单的循环浸渍过程易于结晶的Caco _（3）。分析的结合同意棉纤维的表面化学影响不同的CaCO _（3）多晶型物的形成。由几乎纯的纤维素组成的冲洗白棉主要产生最稳定的方解石，而含有蛋白质的原始白色和生棕色棉花促进了部分亚稳态的Vaterite的生产。在洗脱的棉花上更好地定义了方解石的形态。矿化改变了原始棉顿的疏水表面，以亲水，即水分增加，从130至0度的水接触角度降低。矿化棉花也表现出改善的热阻，即热分解较慢，随着活化能量降低，热释放能力降低至多40％。

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