贮存容器顶空率对氧化大豆油电导率的影响

试验探究大豆油(SO)贮存容器顶空率(HSR)对其氧化程度的影响。采用加速模拟试验,在温度50℃、初始氧分压21kPa(大气氧分压)、室内相对湿度(40%)和光照度(840lx)条件下,依次设定HSR为20%、35%、50%、65%和80%,分别连续3W氧化大豆压榨油(SSO)、大豆浸出油(ESO)和大豆调和油(BSO),每周测定一次试样电导率(κ)并用其表征氧化程度。结果表明,κ与氧化时间(t)符合二项式关系,κ~HSR关系依SSO、ESO和BSO顺序分别为κ=8×10^-5HSR^2+0.0094HSR+1.8929、κ=3×10^-4HSR^2-0.0116HSR+0.5041和κ=-3×10^-5HSR^2+0.0205HSR+0.2043,氧化程度按PSO、ESO和BSO顺次增大。SO销售与食用过程中HSR不断增大,氧不断得到补充,导致其不断地氧化。在控制好贮存环境条件的同时,采取有效措施消除HSR影响,有利于SO的保质。

顶空率对大豆浸出油氧化的影响

研究顶空率(HSR)对大豆浸出油(ESO)氧化的影响规律,用多元表征参数(CP)综合描述ESO的氧化过程。在温度50℃、相对湿度40%、大气氧分压、光照度800 lx的固定条件下,调控HSR分别为20%、35%、50%、65%和80%,试样连续氧化11~21 d,期间多次测定其电导率、过氧化值、酸值、热值和折光率。结果表明,ESO氧化速率随HSR增大而升高,其氧化反应的速率常数随CP变化很大;热值可作为大豆油氧化的新CP。降低HSR可延长大豆油保质期,用多元CP综合描述大豆油氧化能全面反映其本质,应用价值更大。

Investigation of top-emitting OLEDs using molybdenum oxide as anode buffer layer

A high-effective bottom anode is essential for high-performance top-emitting organic light-emitting devices (OLEDs). In this paper, Ag-based top-emitting OLEDs are investigated. Ag has the highest reflectivity for visible light among all metals, yet its hole-injection properties are not ideal for anodes of top-emitting OLED. The performance of the devices is significantly improved using the molybdenum oxide as anode buffer layer at the surface of Ag. By introducing the molybdenum oxide, the hole injection from Ag anodes into top-emitting OLED is largely enhanced with rather high reflectivity retained.