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Nanoparticle separation based on size-dependent aggregation of nanoparticles due to the critical Casimir effect†
Soft Matter ( IF 3.4 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7sm01971h
Hongyu Guo 1, 2, 3, 4, 5 , Gheorghe Stan 2, 3, 4, 6 , Yun Liu 1, 2, 3, 4, 5
Affiliation  

Nanoparticles typically have an inherent wide size distribution that may affect the performance and reliability of many nanomaterials. Because the synthesis and purification of nanoparticles with desirable sizes are crucial to the applications of nanoparticles in various fields including medicine, biology, health care, and energy, there is a great need to search for more efficient and generic methods for size-selective nanoparticle purification/separation. Here we propose and conclusively demonstrate the effectiveness of a size-selective particle purification/separation method based on the critical Casimir force. The critical Casimir force is a generic interaction between colloidal particles near the solvent critical point and has been extensively studied in the past several decades due to its importance in reversibly controlling the aggregation and stability of colloidal particles. Combining multiple experimental techniques, we found that the critical Casimir force-induced aggregation depends on relative particle sizes in a system with larger ones aggregating first and the smaller ones remaining in solution. Based on this observation, a new size-dependent nanoparticle purification/separation method is proposed and demonstrated to be very efficient in purifying commercial silica nanoparticles in the lutidine/water binary solvent. Due to the ubiquity of the critical Casimir force for many colloidal particles in binary solvents, this method might be applicable to many types of colloidal particles.

中文翻译:

由于关键的卡西米尔效应,基于纳米颗粒的尺寸依赖性聚集的纳米颗粒分离

纳米粒子通常具有固有的宽尺寸分布,这可能会影响许多纳米材料的性能和可靠性。由于具有所需尺寸的纳米颗粒的合成和纯化对于纳米颗粒在包括医学,生物学,保健和能源在内的各个领域的应用至关重要,因此迫切需要寻找更有效和通用的尺寸选择性纳米颗粒纯化方法/分隔。在这里,我们提出并最终证明了基于临界卡西米尔力的尺寸选择性颗粒纯化/分离方法的有效性。卡西米尔临界力是溶剂临界点附近胶体颗粒之间的一般相互作用,由于其在可逆地控制胶体颗粒的聚集和稳定性方面的重要性,在过去的几十年中进行了广泛的研究。结合多种实验技术,我们发现关键的卡西米尔力诱导的聚集取决于系统中的相对粒径,其中较大的首先聚集,而较小的则保留在溶液中。基于此观察结果,提出了一种新的尺寸依赖性纳米颗粒纯化/分离方法,并证明了在二甲基吡啶/水二元溶剂中纯化商业二氧化硅纳米颗粒非常有效。由于二元溶剂中许多胶体颗粒的临界卡西米尔力无处不在,
更新日期:2018-01-02
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