Charge-induced gelation of microparticles
Charge-induced gelation of microparticles
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电荷诱导的微粒凝胶化
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Roth
中科院分区：
文献类型：
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作者：
U. Konopka;F. Mokler;A. Ivlev;M. Kretschmer;G. Morfill;H. Thomas;H. Rothermel;V. Fortov;A. Lipaev;V. Molotkov;A. Nefedov;Y. Baturin;Y. Budarin;A. Ivanov;M. Roth
在国际空间站进行的实验中发现了一种高效的微粒凝结过程。带电微球注入到低压中性气体环境中形成毫米大小的聚集体，提供了足够高的初始数密度。凝结发生的速度比通常观察到的不带电颗粒快104-105倍。理论估计表明，这一过程是如此之快，它甚至不能被解释的凝聚过程与电荷增强的横截面。然而，观察结果可以用“凝胶化相变”来描述。我们总结了显着的测量，概述了理论描述，并显示其兼容性。
A highly efficient coagulation process of microparticles was discovered during experiments that were carried out on the International Space Station. Charged microspheres injected into a low pressure neutral gas environment form mm-sized aggregates, provided the initial number density is high enough. The coagulation occurred at a rate ∼104–105 times faster than that usually observed with uncharged grains. Theoretical estimates show that this process is so fast that it cannot even be explained by a coagulation process with charge enhanced cross-section. The observations can, however, be described by a ‘gelation phase transition’. We summarize the salient measurements, outline the theoretical description and show their compatibility.