Understanding the adsorption behavior of oxygen on the 3C–SiC(1 1 0) surface: A first-principles study

The adsorption behavior of atomic oxygen and molecular O₂ on the 3C–SiC(1 1 0) surface is investigated by first-principles calculations. The atomic O prefers to be adsorbed at the C top site (C–O) with adsorption energy of −1.95 eV after zero-point energy correction, followed by the C–O–Si bridge site, Si–O–Si bridge site, and the Si top site (Si–O) with adsorption energies of −1.46, −1.36, and −1.13 eV, respectively. The molecular O₂ separately trapped by the second nearest neighboring C and Si atoms (C–O–O–Si, M4 type) is the most stable configuration with the adsorption energy of −2.46 eV, which is followed by the Si–O–O–Si (M5 type), C–O–O–Si (M3 type), O–Si–O (M2 type), and Si–O=O (M1 type) configurations with the adsorption energies of −2.24, −1.87, −1.07, and −0.75 eV, respectively. All these molecular O₂ adsorption configurations exhibit high tendency to dissociate with the dissociation barriers range of 0.09–0.19 eV. The adsorbed atomic O seems to be easily trapped at the C–O site due to the extremely low diffusion barrier. In addition, the infrared spectra of all the atomic O and molecular O₂ adsorption configurations are predicted and compared with available experimental observations.     

表面活性剂对无烟煤煤尘的抑尘效果研究北大核心

研究了脂肪醇聚氧乙烯醚(AEO_(9))、十二烷基硫酸钠(SDS)和十二烷基三甲基溴化胺(DTAB)3种表面活性剂溶液对晋城无烟煤呼吸性粉尘的抑尘效果。在临界胶束质量分数(CMC)下,利用悬滴法和座滴法分别测定了表面活性剂溶液的动态表面张力和在无烟煤表面的动态接触角;利用分子动力学模拟研究了表面活性剂与无烟煤的吸附强度、胶束的稳定性以及单分子在水中的扩散系数。实验结果表明:AEO_(9)溶液对煤尘的降尘效果最好,SDS次之,DTAB最差;在临界胶束质量分数(CMC)以上,悬滴平衡态表面张力值依次是AEO_(9)相似文献   

肌球蛋白的解离研究进展

肌球蛋白是肌肉中含量最高的蛋白质，占肌原纤维总蛋白质的60%。肌球蛋白能提高肉制品的保水性和嫩度、增强脂肪乳化稳定性、改善凝胶肉制品品质，对肉制品的加工具有重要意义。然而，肌球蛋白通常被束缚在肌原纤维粗肌丝中，若要充分发挥其作用，需将其从肌原纤维中解离出来。该研究综述了肌动球蛋白的解离对加工肉制品品质的影响，并在此基础上进一步讨论了肌动球蛋白的解离机制，同时对加工过程中温度、pH值、食盐与焦磷酸盐等影响肌动球蛋白解离的因子进行研究和总结，为肉制品加工提供新思路，为提高加工肉制品品质奠定基础。     

Realizing efficient exciton dissociation in an all-organic heterojunction photocatalyst for highly improved photocatalytic H2 evolution

Although graphitic carbon nitride is a promising photocatalyst in the field of energy conversion and environmental purification, the intrinsic properties like excitonic effects and sluggish charge transfer restrict further photocatalytic applications. To circumvent these limitations, the novel all-organic heterojunction photocatalysts were constructed by anchoring organic carbon dots (O-dots) on porous graphitic carbon nitride nanosheets (O-dots/CNS). Results demonstrated that excitons can be e?ectively dissociated into electrons and holes at the interface of O-dots/CNS heterojunction, followed by holes injected to O-dots and electrons accumulated in CNS to realize efficient charge separation. Consequently, the O-dots/CNS with the optimized hydrogen (H₂) evolution performance could be reached 1564.5 μmol h^?1g^?1 under the visible light irradiation. This work not only presents new ideas for rational design photocatalytic reaction system from exciton and charge carrier, but also broaden the applications of this new kind of organic dots in the field of energy conversion.     

铜冶炼炉渣工艺矿物学探讨

采用化学分析、化学物相分析、显微镜观察及扫描电镜考察等工艺矿物学研究手段，分析了不同铜冶炼渣的化学组成及矿物物相组成，对铜冶炼渣中重要矿物的嵌布特征和嵌布粒度进行了系统的研究，对其利用中存在的问题进行了分析，为铜冶炼渣的综合回收利用提供了理论依据。     

不同粒度下微山稀土矿物颗粒赋存研究

采用工艺矿物学自动分析仪(BPMA)、扫描电子显微镜等先进设备对山东微山稀土矿物中稀土的赋存状态进行了研究.结果表明,矿物中的稀土矿物主要赋存于氟碳酸岩中,极少数赋存于独居石、铈磷灰石中.同时稀土矿物与方解石、天青石、萤石、石英等嵌布十分密切.通过对不同研磨时间的矿物颗粒进行分析,发现稀土矿物颗粒中方解石呈微细胞颗粒分...