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RISS 인기검색어
- 검색키워드
- 저자 : Chenwei Guo (검색결과 2 건)
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Effect of Water Absorption and Loss Characteristics of Fine Aggregates on Aggregate-Asphalt Adhesion
Jie Ji,Yang Dong,Ran Zhang,Zhi Suo,Chenwei Guo,Xu Yang,Zhanping You 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.6
This study aims to investigate the effect of aggregate water absorption and loss characteristics on aggregate-asphalt adhesion. Lab tests were designed to analyze the water absorption and loss characteristics of limestone, basalt. and steel slag fine aggregates with different particle sizes under various temperatures and humidity conditions. Meanwhile, the low temperature nitrogen adsorption test, combined with the Brunauer, Emmett and Teller (BET) theory and Barret, Joyner and Halend (BJH) model, were used to calculate the specific surface area and pore size distribution of aggregate. Moreover, the asphalt-aggregate adhesion was evaluated by the net adsorption test. The results indicated that the change trends of water absorption and loss for the aggregates exhibited two stages. In the first stage, the amounts of water absorption and loss of aggregates were large and their change rates were high, while in the second stage, an opposite trend was observed. Humidity had the greatest influence on the water absorption and loss of aggregates, followed by aggregate particle size, contact time, temperature, and aggregate type. The smaller-sized aggregates had greater specific surface area, which led to a higher sensitivity to temperature and humidity changes. In comparison, the 0.3 mm-sized aggregate had a large capillary energy inside the pores, and it was the most sensitive to moisture. The steel slag aggregate had the strongest adhesion with asphalt, followed by the limestone aggregate, and the worst was basalt aggregate.
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Room temperature pH-dependent ammonia gas sensors using graphene quantum dots
Chen, Wei,Li, Fushan,Ooi, Poh Choon,Ye, Yun,Kim, Tae Whan,Guo, Tailiang Elsevier 2016 Sensors and actuators. B, Chemical Vol.222 No.-
<P><B>Abstract</B></P> <P>We report a simple solution-process route to realize ammonia (NH<SUB>3</SUB>) gas sensor based on graphene quantum dots (GQDs). Transmission electron microscopy analysis confirmed that the 8–10nm GQDs were formed from multi-walled carbon nanotubes by using ultrasonication treatment. The as-fabricated gas sensor showed promising selectivity response when expose to NH<SUB>3</SUB> ambient at room temperature. It is indicated that by adjusting the pH value of the aqueous GQDs in acidic and neutral, two types of gas sensors with contrary current responses could be obtained, which might be resulted from quantum confinement, edge effects and presence of functional groups on GQDs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report an NH<SUB>3</SUB> gas sensor at room temperature based on graphene quantum dots. </LI> <LI> GQDs were formed from multi-walled carbon nanotubes by ultrasonication treatment. </LI> <LI> Adjusting the pH value of the GQDs can lead to gas sensors with different behavior. </LI> <LI> Sensing mechanism might be resulted from the unique properties of GQDs. </LI> </UL> </P>
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