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Nanoparticle‐Reinforced Silica Gels with Enhanced Mechanical Properties and Excellent pH‐Sensing Performance
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-01-28 , DOI: 10.1002/ppsc.201900404 Xinyuan Xie 1, 2 , Yingshi Deng 1 , Jiehui Peng 1 , Shiqi Zheng 2 , Chezheng Cao 2 , Weiguo Xie 3 , Xiaochun Li 2
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-01-28 , DOI: 10.1002/ppsc.201900404 Xinyuan Xie 1, 2 , Yingshi Deng 1 , Jiehui Peng 1 , Shiqi Zheng 2 , Chezheng Cao 2 , Weiguo Xie 3 , Xiaochun Li 2
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Silica gels offer excellent wear resistance, high chemical stability, good insulation, and light transmittance, are therefore promising to engineer 2D sensing films. However, their practical applications are greatly hampered by their poor structural stability, low sensitivity, reliability, and repeatability. Incorporation of nanoelements into glasses and ceramics is a promising new pathway to tackle these challenges. Unfortunately, it is difficult to disperse nanoparticles uniformly in any glass and ceramics. Herein, a facile sol–gel approach is applied to synthesize novel silica gel nanocomposites with dispersed nanoparticles (NPs) as additives and thymol blue as an indicator. Titanium dioxide (TiO2) NPs with a diameter of 5 nm can be dispersed uniformly in the silica gel, with enhanced modulus and hardness (up to 230% and 138%, respectively) and good alkaline resistance. The addition of nanoparticles improves the film's stability, sensitivity, and repeatability of spectral responses (in pH 1–12), and reduces the indicator leakage. The interaction of indicator with silica gel substrate, nanoparticles, and H+ is analyzed to elucidate the principle of reversible color change. This novel simplified method to produce glass‐like functional materials under much lower temperatures is groundbreaking in materials science and engineering.
中文翻译：
具有增强的机械性能和出色的pH敏感性能的纳米颗粒增强硅胶
硅胶具有出色的耐磨性，高化学稳定性，良好的绝缘性和透光率，因此有望用于2D传感膜的工程设计。然而，它们的实际应用因其差的结构稳定性，低灵敏度，可靠性和可重复性而受到很大阻碍。将纳米元素掺入玻璃和陶瓷中是解决这些挑战的有希望的新途径。不幸的是，难以将纳米颗粒均匀地分散在任何玻璃和陶瓷中。本文中，一种简便的溶胶-凝胶方法被用于合成新型硅胶纳米复合材料，其中分散的纳米颗粒（NPs）作为添加剂，百里酚蓝作为指示剂。二氧化钛（TiO 2直径为5 nm的NP可以均匀地分散在硅胶中，具有增强的模量和硬度（分别高达230％和138％）和良好的耐碱性。纳米粒子的添加提高了薄膜的稳定性，灵敏度和光谱响应的重复性（在pH 1-12中），并减少了指示剂泄漏。分析了指示剂与硅胶基质，纳米颗粒和H +的相互作用，以阐明可逆颜色变化的原理。这种在低温下生产类似玻璃的功能材料的新颖简化方法在材料科学和工程领域是开创性的。
更新日期：2020-01-28
中文翻译：
具有增强的机械性能和出色的pH敏感性能的纳米颗粒增强硅胶
硅胶具有出色的耐磨性，高化学稳定性，良好的绝缘性和透光率，因此有望用于2D传感膜的工程设计。然而，它们的实际应用因其差的结构稳定性，低灵敏度，可靠性和可重复性而受到很大阻碍。将纳米元素掺入玻璃和陶瓷中是解决这些挑战的有希望的新途径。不幸的是，难以将纳米颗粒均匀地分散在任何玻璃和陶瓷中。本文中，一种简便的溶胶-凝胶方法被用于合成新型硅胶纳米复合材料，其中分散的纳米颗粒（NPs）作为添加剂，百里酚蓝作为指示剂。二氧化钛（TiO 2直径为5 nm的NP可以均匀地分散在硅胶中，具有增强的模量和硬度（分别高达230％和138％）和良好的耐碱性。纳米粒子的添加提高了薄膜的稳定性，灵敏度和光谱响应的重复性（在pH 1-12中），并减少了指示剂泄漏。分析了指示剂与硅胶基质，纳米颗粒和H +的相互作用，以阐明可逆颜色变化的原理。这种在低温下生产类似玻璃的功能材料的新颖简化方法在材料科学和工程领域是开创性的。
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