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首页> 外文期刊>International Journal of Electrochemical Science >Colloidal Properties and Stability of 2D Ti3C2 and Ti2C MXenes in Water
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Colloidal Properties and Stability of 2D Ti3C2 and Ti2C MXenes in Water

机译：水中2D Ti 3 C 2 和Ti 2 C MXene的胶体性质和稳定性

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While MXenes have been utilized in many applications, their surface properties in water systems arestill unexplored, especially in the aspect of colloidal properties, which highly limits their practical use.In this study, the colloidal properties and stabilities of 2D Ti3C2 and Ti2C MXenes were investigatedusing time-resolved dynamic light scattering and zeta potential over a wide range of waters (deionizedwater, tap water and physiological NaCl solution of 0.9%) relevant to natural and engineered systems.Our results indicate that pH has a significant influence on Ti3C2 and Ti2C stabilities from pH 4 to 10.The type of water environment also affects the stability of Ti3C2 and Ti2C due to electrical double layercompression. The aggregation and stabilities of Ti3C2 and Ti2C in the aquatic systems followedcolloidal theories, even though Ti3C2 and Ti2C flakes shape is not spherical. The presence of NaClstabilized more the 2D Ti3C2 than the 2D Ti2C. Dispersions prepared when using tap water were morestable in the case of Ti2C compared to the NaCl solution. The opposite effect was found for Ti3C2. Thismay be due to the binding capacity of Ca2+ ions with hydroxyl and carbonyl functional groups whoseamounts vary on the surface of Ti3C2 and Ti2C. In general, our study demonstrates that the 2D flakesof Ti3C2 MXenes are highly stable in NaCl, although they settle more quickly in tap water. The 2Dflakes of Ti2C MXenes are more stable in distilled water and less stable in the physiological NaClsolution.
机译：虽然MXenes已在许多应用中得到利用，但它们在水系统中的表面性能仍未得到探索，特别是在胶体性能方面，这严重限制了它们的实际应用。与自然和工程系统相关的各种水（去离子水，自来水和生理NaCl溶液的0.9％）中的时间分辨动态光散射和Zeta电位。 pH值为4至10。由于双电层压缩，水环境的类型也会影响Ti3C2和Ti2C的稳定性。即使Ti3C2和Ti2C的薄片形状不是球形，在水生系统中Ti3C2和Ti2C的聚集和稳定性也遵循胶体理论。 NaCl的存在使2D Ti3C2比2D Ti2C更稳定。与NaCl溶液相比，使用Ti2C时使用自来水制备的分散液更稳定。对于Ti3C2发现了相反的效果。这可能是由于Ca2 +离子与羟基和羰基官能团（在Ti3C2和Ti2C的表面上含量有所变化）的结合能力所致。通常，我们的研究表明，Ti3C2 MXene的二维薄片在NaCl中是高度稳定的，尽管它们在自来水中的沉降速度更快。 Ti2C MXenes的2D薄片在蒸馏水中更稳定，在生理NaCl溶液中更不稳定。

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