Improving Powder Characteristics by Surface Modification Using Atomic Layer Deposition,Organic Process Research & Development

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Improving Powder Characteristics by Surface Modification Using Atomic Layer Deposition
Organic Process Research & Development ( IF 3.1 ) Pub Date : 2019-11-07 , DOI: 10.1021/acs.oprd.9b00247
Cosima Hirschberg ₁ , Nikolaj Sølvkær Jensen ₁ , Johan Boetker ₁ , Anders Østergaard Madsen ₁ , Tommi O. Kääriäinen _{2,

3} , Marja-Leena Kääriäinen ₂ , Pekka Hoppu ₂ , Steven M. George ₃ , Matti Murtomaa ₄ , Changquan Calvin Sun ₅ , Jens Risbo ₆ , Jukka Rantanen ₁

Affiliation

The particulate properties of a material after primary manufacturing have a large impact on the secondary manufacturing processes. Especially, powder characteristics leading to poor flowability are critical and need to be controlled at the late steps of primary operations. The surface properties of the primary particles are hereby one of the determining factors for the behavior of particulate systems. Materials with different particulate properties were coated using atomic layer deposition (ALD) to apply an ultrathin film of TiO₂ on the primary particles. The presence of TiO₂ coating was confirmed using X-ray photoelectron spectroscopy. Five TiO₂ ALD layers on the particle surface were enough to quadruple the flowability of a partially crystalline material and to triple the flowability of an amorphous material. The coating process did not change the solid form of the materials and did not affect other critical characteristics related to the functionality of the materials. Altogether, the ALD coating of powders provides new possibilities as a scalable and potentially continuously operating process that can solve problems related to powder flowability during handling of bulk powders.

中文翻译：

通过使用原子层沉积进行表面改性来改善粉末特性

一次制造后材料的颗粒性质对二次制造过程有很大的影响。尤其是，导致流动性差的粉末特性至关重要，需要在初级操作的后期进行控制。因此，初级颗粒的表面性质是决定颗粒体系行为的因素之一。使用原子层沉积（ALD）涂覆具有不同颗粒特性的材料，以在原始颗粒上涂覆TiO ₂超薄膜。使用X射线光电子能谱确认了TiO ₂涂层的存在。五氧化钛₂颗粒表面上的ALD层足以使部分结晶的材料的流动性增加四倍，并使无定形材料的流动性增加三倍。涂覆过程不会改变材料的固态形式，也不会影响与材料功能相关的其他关键特性。总之，粉末的ALD涂层作为可扩展且可能连续运行的过程提供了新的可能性，可以解决与散装粉末处理过程中的粉末流动性相关的问题。

更新日期：2019-11-08

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