Slip flow through colloidal crystals of varying particle diameter.
Slip flow through colloidal crystals of varying particle diameter.
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DOI：
10.1021/nn305028f
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发表时间：
2013-01-22
期刊：
影响因子：
17.1
通讯作者：
Wirth, Mary J.
中科院分区：
文献类型：
--
作者：
Rogers, Benjamin J.;Wirth, Mary J.
实验研究了8种不同粒径的二氧化硅胶体晶体中水的滑移流动，其水力通道半径从15 nm到800 nm不等。将颗粒表面甲硅烷基化为低能量，水接触角为83°，如针对甲硅烷基化的平坦表面所测定的。使用商业液相色谱仪测量通过厘米长度的胶体晶体的流速，以使用高达1010 Pa/m的压力梯度精确比较水和甲苯流速。对于所有液压通道半径，甲苯均表现出无滑移哈根-普瓦勒流动。对于水，作为水力通道半径的函数的滑移流增强通过Hagen-Poietille流的预期滑移流校正被很好地描述，并且数据显示恒定的滑移长度为63±3 nm。对于15 nm的最小水力通道半径，观察到20±2的流动增强。滑移流的量被认为是独立的剪切速率在流体速度从0.7至5.8毫米/秒的范围内。结果支持的适用性的滑移流校正的通道半径小至15 nm。这项工作表明，填充床的亚微米颗粒使滑流被用于高体积流量。
Slip flow of water through silica colloidal crystals was investigated experimentally for 8 different particle diameters, which have hydraulic channel radii ranging from 15 nm to 800 nm. The particle surfaces were silylated to be low in energy, with a water contact angle of 83°, as determined for a silylated flat surface. Flow rates through centimeter lengths of colloidal crystal were measured using a commercial liquid chromatograph for accurate comparisons of water and toluene flow rates using pressure gradients as high as 1010 Pa/m. Toluene exhibited no-slip Hagen-Poiseuille flow for all hydraulic channel radii. For water, the slip flow enhancement as a function of hydraulic channel radius was described well by the expected slip flow correction for Hagen-Poiseuille flow, and the data revealed a constant slip length of 63±3 nm. A flow enhancement of 20±2 was observed for the smallest hydraulic channel radius of 15 nm. The amount of slip flow was found to be independent of shear rate over a range of fluid velocities from 0.7 to 5.8 mm/s. The results support the applicability of the slip flow correction for channel radii as small as 15 nm. The work demonstrates that packed beds of submicrometer particles enable slip flow to be employed for high volume flow rates.
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