液相脱氯技术现状与研究进展

介绍了用于液相(水相、有机相)的催化脱氯技术、电化学脱氯技术、无机氯脱氯技术及生物脱氯技术的特点、原理和相应脱氯剂的研究进展。     

非晶态合金催化剂的研究进展

非晶态合金是一种新型催化剂。介绍了非晶态合金催化剂的特性、制备方法及表征手段,简述了其在加氢反应、脱氢反应等方面的应用及前景。     

Optimal growth windows of multiferroic BiFeO3 films and characteristics of ferroelectric domain structures

Multiferroic BiFeO₃ films of smooth surface and fully-saturated ferroelectric hysteresis loops have been grown by RF magnetron sputtering. The (001)-oriented epitaxial films showed a large remanent polarisation of 61 µC/cm². A strategy to grow BiFeO₃ films of good ferroelectric property was demonstrated, that was using fast growth rate to achieve accurate stoichiometry for the BiFeO₃ phase and at the same time to avoid the formation of impurity phases associated with the fast growth by accurate control of thermodynamic parameters such as oxygen partial pressure and temperature, as well as proper selection of substrates. Piezoresponse force microscopy revealed fine spontaneous domains for highly resistive epitaxial films, which were switchable under DC biases. For the polycrystalline films of increased density of free carriers, single-domain grains of about 200 nm in diameter were observed due to effective compensation of depolarisation field by free carriers and therefore allowing larger domains.     

ROS‐Responsive Polyprodrug Nanoparticles for Triggered Drug Delivery and Effective Cancer Therapy

The application of nanoparticles (NPs) to drug delivery has led to the development of novel nanotherapeutics for the treatment of various diseases including cancer. However, clinical use of NP‐mediated drug delivery has not always translated into improved survival of cancer patients, in part due to the suboptimal properties of NP platforms, such as premature drug leakage during preparation, storage, or blood circulation, lack of active targeting to tumor tissue and cells, and poor tissue penetration. Herein, an innovative reactive oxygen species (ROS)‐responsive polyprodrug is reported that can self‐assemble into stable NPs with high drug loading. This new NP platform is composed of the following key components: (i) polyprodrug inner core that can respond to ROS for triggered release of intact therapeutic molecules, (ii) polyethylene glycol (PEG) outer shell to prolong blood circulation; and (iii) surface‐encoded internalizing RGD (iRGD) to enhance tumor targeting and tissue penetration. These targeted ROS‐responsive polyprodrug NPs show significant inhibition of tumor cell growth both in vitro and in vivo.     

不同添加剂对可食性花生分离蛋白膜性能的影响

为改善花生分离蛋白膜的性能,本文研究了不同添加剂对可食性花生分离蛋白膜色度、水溶性、透光率、阻氧性、阻水性以及机械性能的影响,并选取综合性能优良的膜应用在番茄保鲜中。研究结果表明:不同添加剂对花生分离蛋白膜性能都有不同的影响,其中添加0.4%月桂酸的花生分离蛋白膜综合性能最好,尤其是阻水性,水蒸气透过速率仅有4.90 g/(h.m2);其次是添加1%淀粉和添加0.2%葡萄糖的花生分离蛋白膜。将其应用在番茄保鲜中能抑制机体的呼吸作用,延缓贮藏过程中水分的散失以及硬度的降低,有效地延长了番茄的贮藏期。     

单颗粒催化剂上非理想体系的反应-扩散模型(I)非理想体系反应-扩散模型的建立

基于力平衡和通量的观点,建立了多孔催化剂上非理想体系的反应-扩散模型.该模型综合考虑了非理想气体反应体系的热力学特性和各组分通量之间的相互耦合作用;此外,该模型可根据实际情况依次简化为常规意义上的尘气模型、广义Stefan-Maxwell模型和费克扩散模型.作为单颗粒催化剂上反应-扩散过程通用模拟软件开发的基础,该模型明显优于其他常规模型.     

单颗粒催化剂上非理想体系的反应-扩散模型(Ⅰ)——非理想体系反应-扩散模型的建立

基于力平衡和通量的观点,建立了多孔催化剂上非理想体系的反应-扩散模型.该模型综合考虑了非理想气体反应体系的热力学特性和各组分通量之间的相互耦合作用;此外,该模型可根据实际情况依次简化为常规意义上的尘气模型、广义Stefan-Maxwell模型和费克扩散模型.作为单颗粒催化剂上反应-扩散过程通用模拟软件开发的基础,该模型明显优于其他常规模型.     

基于ARM的摩擦焊机压力闭环控制系统的设计

设计了基于ARM的摩擦焊机压力闭环控制系统,该控制系统以S3C44B0X处理器为控制系统核心器件,以电液比例溢流阀为执行系统关键部件,并引入增量式PID算法对摩擦焊机顶锻压力进行控制。实验结果表明:该系统快速、稳定、可靠,且具有较强的抗干扰性。     

The role of wettability of nonideal nozzle plate: From drop‐on‐demand droplet jetting to impact on solid substrate

The dynamics of drop‐on‐demand (DoD) droplet formation and subsequently impact on the solid substrate are investigated using a three‐dimensional (3‐D) multirelaxation‐time (MRT) pseudopotential lattice Boltzmann (LB) model. The wettability of nonideal nozzle plate and solid substrate is modeled by a geometric scheme within the LB framework. The dynamics of droplet formation are explored in a range of the inverse of Ohnesorge number , , and , and the Reynolds number , , and . For , no satellite droplet is observed and the wettability of nozzle plate greatly influences the velocity and length of jetting fluids. For , the filament breakup and recombination are observed. The moment of filament breakup is delayed with advancing contact angle increasing. For with , the primary and satellite droplets could not be recombined with and which agree with the literature. Whereas with , the recombination occurs. The dynamics of subsequent oscillating droplet impact on the substrate are similar to that of equilibrium droplet which could obtain high‐resolution printed features. Consequently, considering with large and numbers, the printable range could be extended which could help increase the printing frequency and boost the production outputs of inkjet printing. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2837–2850, 2018     

利用STM进行纳米加工的研究

本文对空气中应用扫描隧道显微镜（STM）进行的纳米级加工进行了研究。采用石墨（HOPG）和金薄膜作为样品．通过在STM探针和样品之间施加一定的电压脉冲制造出了具有纳米级尺度的结构。本文对形成的特征结构进行了分析．总结出部分实验规律．认为电场静电力作用使STM针尖或样品产生的机械变形是特征结构形成的主要原因。