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White, James L .,Kim, Kwang Jea 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.1
Treated silica particles with four different silane coupling agents with different silane chain length were compounded in EPDM using an internal mixer, and their agglomerate sizes, viscosity, and extrudate swell were investigated. The treated silica compounds showed a smaller agglomerate size, lower viscosity, and lower swell reduction than the untreated silica compound after equivalent mixing times. The bis(triethoxysilyl-propyl)tetrasulfane (TESPT) treated silica compound exhibited a lower viscosity than the other treated compounds, however exhibited a large agglomerate size, whereas the short chain silane (SN203) treated compounds exhibited a smaller agglomerate size with a higher viscosity. The long chain silane (SN116) treated compound exhibited a lower viscosity with a better dispersion than the TESPT treated compound. TESPT acted as a processing aid in the silica/EPDM compounds. The extrudate swell reduction of the TESPT, SA2T, SN203, SN208, and SN116 treated silica compounds was less than that of the untreated silica compounds.
White, James L .,Kim, Kwang Jea 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.4
The breakdown rates of filler agglomerates, compounded in ethylene-propylene-diene terpolymer (EPDM) matrix, were compared using silica, carbon black, calcite, talc and zinc oxide in an internal mixer (Int). The shear viscosity and the extrudate character were used for investigation. Small sized, silica agglomerates were the most difficult particle to disperse. The small silica particle filled EPDM system exhibited the highest viscosity level. The quality of the extrudate smoothness improved, but the magnitude of the swell d/D decreased with small size particles. Among the fillers used, the zinc oxide exhibited the poorest character in the extrudate quality.
Silica Agglomerate Breakdown in Three - Stage Mix Including a Continuous Ultrasonic Extruder
White, James L .,Kim, Kwang Jea 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.6
The dispersive mixing of premixed nano-size untreated and treated silica particles, and compounds in ethylene-propylene-diene terpolymer (EPDM) were studied using an ultrasonic extruder (Ultra) and compared with an internal mixer (Int) processing. The rheological properties and extrudate swell of the compounds were investigated and compared with carbon black filled compounds. The Ultra processing broke down the silica agglomerate sizes effectively, which became smaller than after an Int processing. The silane treated silica exhibited a considerable reduction in the agglomerate sizes compared to the untreated silica in an Int. These results were then compared with carbon black filled compounds. The viscosity of the compounds with untreated and treated silica was higher than the compounds with carbon black. This may be due to the rough surface of the silica particles. The silane treated compounds exhibited a lower viscosity than the untreated compounds. The effect of extrudate swell reduction was minimal on the treated compounds.
Nanostructured Metal Hydrides for Hydrogen Storage
Schneemann, Andreas,White, James L.,Kang, ShinYoung,Jeong, Sohee,Wan, Liwen F.,Cho, Eun Seon,Heo, Tae Wook,Prendergast, David,Urban, Jeffrey J.,Wood, Brandon C.,Allendorf, Mark D.,Stavila, Vitalie American Chemical Society 2018 Chemical reviews Vol.118 No.22
<P>Knowledge and foundational understanding of phenomena associated with the behavior of materials at the nanoscale is one of the key scientific challenges toward a sustainable energy future. Size reduction from bulk to the nanoscale leads to a variety of exciting and anomalous phenomena due to enhanced surface-to-volume ratio, reduced transport length, and tunable nanointerfaces. Nanostructured metal hydrides are an important class of materials with significant potential for energy storage applications. Hydrogen storage in nanoscale metal hydrides has been recognized as a potentially transformative technology, and the field is now growing steadily due to the ability to tune the material properties more independently and drastically compared to those of their bulk counterparts. The numerous advantages of nanostructured metal hydrides compared to bulk include improved reversibility, altered heats of hydrogen absorption/desorption, nanointerfacial reaction pathways with faster rates, and new surface states capable of activating chemical bonds. This review aims to summarize the progress to date in the area of nanostructured metal hydrides and intends to understand and explain the underpinnings of the innovative concepts and strategies developed over the past decade to tune the thermodynamics and kinetics of hydrogen storage reactions. These recent achievements have the potential to propel further the prospects of tuning the hydride properties at nanoscale, with several promising directions and strategies that could lead to the next generation of solid-state materials for hydrogen storage applications.</P> [FIG OMISSION]</BR>