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연속식 반응기내에서 열수작용에 의한 Zirconium Dioxide 의 제조
김병조,Stambaugh,Edgel P 한국화학공학회 1975 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.13 No.4
A small continuous tubular reactor unit was constructed to study hydrothermal reactions. The unit was used in an experimental research program to study the kinetics of pressure precipitation of zirconium dioxide from aqueous solutions of zirconium tetrachloride. Experimental parameters investigated in the precipitation reaction included the temperature, the reactor residence time, and the feed composition. The significant findings of the study are related to the effect of reaction temperature on the overall rate of precipitation and the effect of feed composition on the precipitation process, which under certain reaction conditions was found to involve an initially slow induction period followed by rapid precipitation. Based on the experimental results, a preliminary design concept was developed for a production-scale unit for manufacturing zirconia having a narrow particle-size distribution.
Dynamic and static measurement of interfacial capillary forces by a hybrid nanomechanical system.
Kwon, Soyoung,Stambaugh, Corey,Kim, Bongsu,An, Sangmin,Jhe, Wonho RSC Pub 2014 Nanoscale Vol.6 No.10
<P>The forces resulting from the presence of interfacial liquids have mechanical importance under ambient conditions. For holistic understanding of the liquid-mediated interactions, we combine the force-gradient sensitivity of an atomic force microscope (AFM) with the force measuring capability of a micro-electromechanical force sensor. Simultaneous measurement of the viscoelasticity of the water nanomeniscus and the absolute capillary force shows excellent agreement in its entire length, which justifies the validity of the widely used AFM results. We apply the hybrid system to measure the stress and strain, whose hysteretic response provides the intrinsic quantities of the liquid nanocluster.</P>
An, Sangmin,Stambaugh, Corey,Kim, Gunn,Lee, Manhee,Kim, Yonghee,Lee, Kunyoung,Jhe, Wonho RSC Pub 2012 Nanoscale Vol.4 No.20
<P>Electric-field-induced low-volume liquid ejection under ambient conditions was realized at a low bias potential of 12 V via a nanopipette (aperture diameter of 30 nm) combined with a non-contact, distance-regulated (within 10 nm) quartz tuning fork-atomic force microscope. A capillary-condensed water meniscus, spontaneously formed in the tip-substrate nanogap, reduces the ejection barrier by four orders of magnitude, facilitating nanoliquid ejection and subsequent liquid transport/dispersion onto the substrate without contact damage from the pipette. A study of nanofluidics through a free-standing liquid nanochannel and nanolithography was performed with this technique. This is an important breakthrough for various applications in controlled nanomaterial-delivery and selective deposition, such as multicolor nanopatterning and nano-inkjet devices.</P>