新型复合药剂的开发

为解决锌盐稳定性、避免聚磷酸盐因水解而形成磷酸钙垢,采用正交试验法得出新型复合配方XG-01,并对其进行了动态模拟试验评价及应用效果考察。     

有机硅氧烷 -丙烯酸酯乳液聚合研究进展

介绍了有机硅-丙烯酸酯乳液聚合物的3种制备方法及各种乳液的特点,对各种乳液的近期研究成果进行了总结。     

磷酸活化粘胶基活性炭纤维的研究Ⅱ.磷酸活化粘胶基活性炭纤维的结构研究

采用吸附仪、元素分析仪、X-射线光电子能谱仪对所制备的磷酸活化粘胶基活性炭纤维( V ACF-P)的孔结构及化学结构进行表征 ,结果表明 :V ACF -P的孔结构是以微孔为主 ,大多数孔的孔径小于 2 nm ,碳化活化温度和活化剂磷酸的浓度变化时 ,孔径分布有所改变 ,产品的含碳量较低 ,约68%～ 84% ,纤维含大量表面含氧基团 ,且碳化活化温度越低的纤维含氧基团越多 ,磷原子主要以多聚磷氧化合物的形式存在。     

户内热转印粉末涂料用混合型聚酯树脂的合成研究

通过分析热转印性能的影响因素合成了不同结构的聚酯树脂,研究了树脂酸值对热转印性能的影响,同时研究了部分单体对聚酯树脂热转印性能的影响。采用DSC热分析法研究了固化促进剂对粉末涂料固化行为的影响,结果表明:选择合适的固化促进剂对涂层转印性能的提高有至关重要的作用。     

Transition-Metal-Catalyzed 1,2-Carboboration of Alkenes: Strategies,Mechanisms, and Stereocontrol

During the past decade, many research groups have described catalytic methods for 1,2-carboboration, allowing access to structurally complex organoboronates from alkenes. Various transition metals, especially copper, palladium, and nickel, have been widely used in these reactions. This review summarizes advances in this field, with a special focus on the catalytic cycles involved in different metal-catalyzed carboboration reactions, as well as the regio- and stereochemical consequences of the underlying mechanisms. 1,2-Carboboration of other unsaturated systems, such as alkynes and allenes, is outside of the scope of this review.     

Co-doping effects of (Al,Ti, Mg) on the microstructure and electrical behavior of ZnO-based ceramics

Co-doped ZnO-based ceramics using Al, Ti, and Mg ions in different ratios were synthesized with the objective to investigate the doping effects on the crystalline features, microstructure and the electrical behavior. For Al and Ti doping, a coexistence of crystalline phases was shown with a major wurtzite ZnO structure and secondary spinel phases (ZnAl₂O₄, Zn₂TiO₄, or Zn_aTi_bAl_cO_d), while Mg doping did not alter significantly the structural features of the wurtzite ZnO phase. The electrical behavior induced by Al, Ti, and Mg co-doping in different ratios was investigated using Raman, electron paramagnetic resonance (EPR) and ²⁷Al and ⁶⁷Zn solid-state nuclear magnetic resonance (NMR). Al doping induces a high electrical conductivity compared to other doping elements. In particular, shallow donors from Zn_i-Al_Zn defect structures are inferred from the characteristic NMR signal at about 185 ppm; that is, quite far from the usual oxygen coordinated Al. The Knight shift effect emanating from a highly conducting Al-doped ZnO ceramics was considered as the origin of this observation. Oppositely, as Ti doping leads to the formation of secondary spinel phases, EPR analysis shows a high concentration of Ti³⁺ ions which limit the electrical conductivity. The correlation between the structural features at the local order, the involved defects and the electrical behavior as function of the doping process are discussed.     

Improved thermal conductivity of β-Si3N4 ceramics by lowering SiO2/Y2O3 ratio using YH2 as sintering additive

A two-step sintering process was conducted to produce β-Si₃N₄ ceramics with high thermal conductivity. During the first step, native SiO₂ was eliminated, and Y₂O₃ was in situ generated by a metal hydride reduction process, resulting in a high Y₂O₃/SiO₂ ratio. The substitution YH₂ for Y₂O₃ endow Si₃N₄ ceramics with an increase of 29% in thermal conductivity from 95.3 to 123 W m⁻¹ K⁻¹ after sintered at 1900°C for 12 hours despite an inferior sinterability. This was primarily attributed to the purified enlarged grains, devitrified grain boundary phase, and reduced lattice oxygen content in the YH₂-MgO-doped material.     

Challenges and Opportunities of Modeling Biomass Gasification in Aspen Plus: A Review

Aspen Plus has become one of the most common process simulation tools for both academia and industrial applications. In the last decade, the number of the papers on Aspen Plus modeling of biomass gasification has significantly increased. This review focuses on recent developments and studies on modeling biomass gasification in Aspen Plus including key aspects such as tar formation and model validation. Accordingly, challenges in modeling due to specific assumptions and limitations will be highlighted to provide a useful basis for researchers and end-users for further process modeling of biomass gasification in Aspen Plus.     

给矿粒度对棒磨产品粒度分布和能耗的影响

使用装有扭矩测试系统的半工业规模棒磨机,研究了磨机给矿粒度和分批作业磨矿机时间对棒磨产品粒度分布及能量消耗的影响;讨论了棒磨机中的粒度选择性磨矿现象.