HLaNb2O7/(Pt,TiO2)的制备和光催化性能研究

用固相合成法合成出KLaNb2O7,酸化得到HLaNb2O7;通过正己胺层间膨胀,氯铂酸铵、TiO2层间插入和紫外光分解等反应,合成出一种新的层状光催化纳米复合材料HLaNb2O7／(Pt,TiO2).采用XRD、DRS对所制备的材料进行了表征。以甲基橙为目标降解物,考察了所制备的材料的光催化性能,结果表明所制备的HLaNb2O7／(Pt,TiO2)纳米复合材料对甲基橙具有较高的光降解效率并且其光催化活性稳定、持久。     

界面区组分对层状水泥基材料力学行为的影响

研究了界面区组分的梯度分布对水泥基材料层状结构力学性能的影响，在非均匀应变模型的基础上，讨论了界面区组分梯度变化所表现的界面应力行为．结果表明，界面区组分梯度分布可以有效缓解界面残余应力，从而明显改善结构整体的力学行为．     

分层复杂网络的鲁棒性研究

文章针对述分层复杂网络的框架结构,阐述了物理层与逻辑层之间的关系;描述负载定义;分析了负载的重新分配问题及其在不同的路径重新选择对策下,对分层复杂网络鲁棒性的影响。通过对典型分层复杂网络舰艇编队作战系统的仿真发现：面对攻击,逻辑层的影响要大予物理层,路径重新选择对策和负载都对分层复杂网络的攻击效果产生重要影响。     

一种新型Ad Hoc网络分层路由协议及性能评价

分层结构已经被引入到有线网络.然而,由于在Ad Hoc网络中所有的终端都是移动的,所以引入分层结构很困难.为解决此问题,提出了一个基于自治分簇策略的新型分层路由协议:Layered-TORA.其能够将终端分成多个自治的簇,数据通过在簇间执行按需路由协议而簇内执行表路由协议达到目的结点.并通过实验对Layered-TORA和TORA进行了比较和分析.证明了,Layered-TORA可有效解决在AdHoc网络中引入分层结构的问题.     

Fabrication of superparamagnetic adsorbent based on layered double hydroxide as effective nanoadsorbent for removal of Sb (III) from water samples

In this study, the superparamagnetic adsorbent as Fe@Mg‐Al LDH was synthesised by different methods with two steps for the removal of heavy metal ions from water samples. An easy, practical, economical, and replicable method was introduced to remove water contaminants, including heavy ions from aquatic environments. Moreover, the structure of superparamagnetic adsorbent was investigated by various methods including Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and vibrating sample magnetometer. For better separation, ethylenediaminetetraacetic acid ligand was used, forming a complex with antimony ions to create suitable conditions for the removal of these ions. Cadmium and antimony ions were studied by floatation in aqueous environments with this superparamagnetic adsorbent owing to effective factors such as pH, amount of superparamagnetic adsorbent, contact time, sample temperature, volume, and ligand concentration. The model of Freundlich, Langmuir, and Temkin isotherms was studied to qualitatively evaluate the adsorption of antimony ions by the superparamagnetic adsorbent. The value of loaded antimony metal ions with Fe@Mg‐Al LDH was resulted at 160.15 mg/g. The standard deviation value in this procedure was found at 7.92%. The desorption volume of antimony metal ions by the adsorbent was found to be 25 ml. The thermodynamic parameters as well as the effect of interfering ions were investigated by graphite furnace atomic absorption spectrometry.     

近5年问世的聚合物/无机物纳米复合材料的阻燃性

综述了近5年问世的无机纳米填料包括碳纳米管(CNT)、层状氧化石墨(LGO)、层状双氢氧化合物(LDH)、多面低聚硅倍半氧烷(PO SS)及纳米碳纤维(CNF)等的复合材料研究进展,重点在于这些材料阻燃性能的特点及与聚合物/层状硅酸盐纳米复合材料(PLSN)的比较,并给予实例阐明。     

类石墨层状硼碳化合物的导电和抗氧化性能的研究

通过高温高压方法制备了一种晶化程度较高的类石墨层状BC3化合物.在5.5GPa压力条件下,温度越高,制得的硼碳样品晶化越好,电阻率越小.在1500℃、5.5GPa下制得的层状硼碳样品的电阻率ρ=1.2×10-4Ω·m,略大于同等条件下制备的纯碳样品的电阻率ρ=1.1×10-4Ω·m.这种层状硼碳化合物在620℃左右开始氧化,比纯碳样品的初始氧化温度高大约100℃,替代的硼明显的改善了碳的抗氧化性能.     

Reversible Flat to Rippling Phase Transition in Fe Containing Layered Battery Electrode Materials

Layered sodium transition metal oxides of NaTMO₂ (TM = 3d transition metal) show unique capability to mix different compositions of Fe to the TM layer, a phenomenon that does not exist in LiTMO₂. Here, a novel spontaneous TM layer rippling in the sodium ion battery cathode materials is reported, revealed by in situ X‐ray diffraction, Cs‐corrected scanning transmission electron microscopy, and density functional theory simulation, where the softening and distortion of FeO₆ octahedra collectively drives the flat TM planes into rippled ones with inhomogeneous interlayer distance at high voltage. In such a rippling phase, charge and discharge of Na ions take different evolution pathways, resulting in an unusual hysteresis voltage loop. Importantly, upon discharge beyond a certain Na composition, the rippling TM layer will go back to flat, giving the reversibility of such structural evolution in the following cycles.