NdCl3—FeCl3—石墨层间化合物的结构表征及稳定性研究

采用熔盐交换法成功地合成了ＮｄＣｌ３－ＦｅＣｌ３－石墨层间化合物,采用ＸＲＤ技术对其层间结构进行了表征,结果表明所得产物为２,３,４ 阶共存的阶结构,其中３ 阶ＮｄＣｌ３－ＧＩＣ的特征层间距为１６５３．６±２．４ｐｍ 。通过扫描电镜（ＳＥＭ） 观察了其形貌的变化, 同时利用Ｘ射线能谱仪（ＥＤＳ） 测定了各元素的相对含量。分析其插入机制认为, ＦｅＣｌ３ 的存在对ＮｄＣｌ３的插入过程有所影响。同时对其在空气中的稳定性和热稳定性进行了研究。     

插层法制备膨润土-有机复合高性能吸水材料的试验研究

研究了膨润土插层聚合制备吸水材料的过程中各因素对膨润土-有机复合高性能吸水材料吸水性能的影响，探索低成本、工艺简单的方法制备出高性能吸水材料，通过XRD、SEM对材料进行了表征，该高性能吸水材料的推广将使有助于新疆优势矿产资源得以利用，可以推动当地的经济发展。     

Intercalation of n-ankylmonoamine and n-alkyldiamine in VOC1

The organic derivatives of vanadium oxychloride (VOC1) have been prepared by the reaction of VOC1 and corresponding amines. The reaction products with dark-brown crystals of flake shape have been characterized by scanning electron micrograph, X-ray diffraction, thermal analysis, elemental analysis and infrared spectroscopy. The n-alkylmonoamine molecules form bilyers at room temperature with the chemical composition of VOC1-0.54 (±0.03) C_XH_2x+1NH₂ (62C_xH_2xNH₂ (6相似文献   

环氧树脂与蒙脱土的插层复合研究

报导了一种新型的环氧树脂／蒙脱土插层复合材料。通过阳离子交换的方法将蒙脱土进行有机化处理,使蒙脱土的片层间距从原来的１．３１ｎｍ增加到２．０１ｎｍ。分别用熔融法、溶剂超声法制备了环氧树脂／蒙脱土的插层复合材料,并用ＳＲＤ方法及ＳＥＭ、ＴＥＭ对体系进行了表征。结果表明,环氧树脂／蒙脱土插层体系具有一定的触变性。７．５份蒙脱土插层改性的环氧树脂体系其屈服应力为６３Ｐａ,在高温固化时不会流淌。     

三元层状正极材料的制备与电化学性能研究

采用机械活化-高温固相法制备了锂离子电池正极材料LiCo1/3Mn1/3Ni1/3O2,研究了烧结时间与球磨时间对合成产物结构与性能的影响。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和电化学性能测试对所得样品的结构、形貌及电化学性能进行了表征。研究结果表明,优化实验条件下制得的材料具有良好的循环性能,在2.7～4.6V电压范围内,充放电电流值为20mA/g时,初始放电比容量为210.76mAh/g,30次循环后容量保持率为91.98%。     

Effects of Yttrium Addition on Microstructure, Hardness and Resistance to Wear and Corrosive Wear of TiNi Alloy

TiNi alloy has a high resistance to wear and could be an excellent candidate for various tribological applications. In this paper, it was demonstrated that by addition of yttrium, hardness properties and resistance to wear and corrosive wear of TiNi alloy were improved. New yttrium rich regions were formed in microstructure of TiNi alloy. The improved properties of this alloy by the yttrium addition could be attributed to the formation of these regions. The results showed that there was an optimum content for addition of yttrium between 2% and 5% (in wt%), and above this content the improvement in properties of TiNi became minor.     

Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures

The marriage between a 2D layered material (2DLM) and a complex transition metal oxide (TMO) results in a variety of physical and chemical phenomena that cannot be achieved in either material alone. Interesting recent discoveries in systems such as graphene/SrTiO₃, graphene/LaAlO₃/SrTiO₃, graphene/ferroelectric oxide, MoS₂/SrTiO₃, and FeSe/SrTiO₃ heterostructures include voltage scaling in field‐effect transistors, charge state coupling across an interface, quantum conductance probing of the electrochemical activity, novel memory functions based on charge traps, and greatly enhanced superconductivity. In this context, various properties and functionalities appearing in numerous different 2DLM/TMO heterostructure systems are reviewed. The results imply that the multidimensional heterostructure approach based on the disparate material systems leads to an entirely new platform for the study of condensed matter physics and materials science. The heterostructures are also highly relevant technologically as each constituent material is a promising candidate for next‐generation optoelectronic devices.     

Intercalation vortices and related microstructural features in the friction-stir welding of dissimilar metals

 Dissimilar plates (0.6 cm thick) of copper and 6061 aluminum alloy; and 2024 aluminum alloy and 6061 aluminum alloy were friction-stir welded at various rotation speeds (400–1200 rpm) and traverse speeds of 1 to 3 mm/s, and produced variations of vortex and other swirl-like intercalations, especially near the weld-zone/work-piece interface. These vortex-like structures are composed of dynamically recrystallized, fine-grained intercalation microstructures which have been observed by optical metallography, scanning electron microscopy and transmission electron microscopy. They are similar to those characterizing mechanical alloying. Such microstructures are especially fascinating because although they resemble vortex instabilities which occur in turbulent fluids, they are formed by extreme deformation in the solid state since centerline temperatures through the weld zone are about 420°C, or ∼0.7 T_M in the 6061 aluminum system. Received: 21 July 1998 / Accepted: 28 August 1998     

Construction of an Unusual Two-Dimensional Layered Structure for Fused-Ring Energetic Materials with High Energy and Good Stability

The creation of high-performance energetic materials with good mechanical sensitivities has been a great challenge over the past decades, since such materials have huge amounts of energy and are thus essentially unstable. Here, we report on a promising fused-ring energetic material with an unusual two-dimensional (2D) structure, 4-nitro-7-azido-pyrazol-[3,4-d]-1,2,3-triazine-2-oxide (NAPTO), whose unique 2D structure has been confirmed by single-crystal X-ray diffraction. Experimental studies show that this novel energetic compound has remarkably high energy (detonation velocity D = 9.12 km·s⁻¹; detonation pressure P = 35.1 GPa), excellent sensitivities toward external stimuli (impact sensitivity IS = 18 J; friction sensitivity FS = 325 N; electrostatic discharge sensitivity EDS = 0.32 J) and a high thermal decomposition temperature (203.2 °C), thus possessing the dual advantages of high energy and low mechanical sensitivities. To our knowledge, NAPTO is the first fused-ring energetic material with 2D layered crystal stacking. The stabilization mechanism toward external stimuli were investigated using molecular simulations, and the theoretical calculation results demonstrate that the ultraflat 2D layered structure can buffer external mechanical stimuli more effectively than other structures by converting the mechanical energy acting on the material into layer sliding and compression. Our study reveals the great promise of the fused-ring 2D layered structure for creating advanced energetic materials.     

电流冲击和接枝对CB/HDPE PTC材料导电稳定性的影响

尝试了利用电流冲击和化学接枝两种方法来改善炭黑填充高密度聚乙烯 (CB HDPE)PTC材料的导电稳定性。发现对化学接枝后的PTC材料再进行电流冲击 ,能大幅度改善其导电稳定性 ,试样经多次热循环后 ,PTC曲线位移非常小     

线状卡宾碳的研究进展和稳定性讨论

综合评述了所有存在的太空星际空间、地球和多种生物体中的线状卡宾碳以及在实验室合成的各种线状卡宾碳，重点评述了线状卡宾碳的稳定性和存在性。分析认为线状卡宾碳的稳定性与其类型、所处气氛、环境有关，提出可以通过插层化合物和端部基团连接等方法获得稳定的线状卡宾碳。     

Synthesis,Al~(3+)/Mg~(2+) Intercalation and Structure Study of Graphite-like Carbon Nitride

Graphite-like carbon nitride(g-C3N4) was synthesized in large quantities at 300 C under nitrogen by a solidstate reaction route.Furthermore,Al3+ and Mg2+ intercalation of g-C3N4 was performed by an electrochemical method.The starting C3N4 materials and intercalation compounds were characterized by X-ray powder diffraction,Fourier transform infrared spectra,thermogravimetry,transmission electron microscopy,and X-ray photoelectron spectroscopy.The possible structure model of intercalation compounds was proposed.The cation-π interactions and electrostatic interactions were used to explain the changes of microstructure and chemical bonds before and after intercalation.     

A New Transient Hot-Wire Instrument for Measuring the Thermal Conductivity of Electrically Conducting and Highly Corrosive Liquids using Small Samples

The transient hot-wire technique is widely used for measurements of the thermal conductivity of most fluids. However, for some particular liquids such as concentrated nitric acid solutions or similar nitric mixtures, for which the thermal properties are important for industrial or security applications, this technique can be difficult to use, which is essentially due to incompatibility between measurement probe materials and highly electrically conducting and corrosive liquids. Moreover, the possible highly energetic (explosive) character of these liquids requires minimum volume liquid samples, and safety measurement devices and processes. It is the purpose of this paper to report on a new patented instrument, based on tantalum short-hot-wire probe technology, which responds to the above requirements and allows safe automated thermal-conductivity measurements of concentrated acid nitric solutions and similar nitric mixtures for liquid samples less than 2 cm³, with uncertainties better than 5%.     

有机酸阴离子/LDH复合材料的插层组装条件及热稳定性研究

以Mg/Al-CO_3-LDH为前体,采用离子交换法制备了脂肪酸(丁二酸、己二酸、癸二酸、酒石酸)和芳香酸(笨甲酸、水杨酸)柱撑水滑石复合材料,并利用XRD、FT-IR、TG和DTA技术对样品进行了结构表征和性能测试.结果表明,通过控制离子交换条件,6种有机酸根离子可以插入水滑石的层间完全取代CO_3~(2-),形成具有超分子结构稳定的有机酸阴离子/LDHs复合材料.     

Intercalation of polyethylene oxide PEO in layered MPS3 (M = Ni, Fe) materials

The intercalation compounds Li_0.96(H₂O)_0.77(PEO)_0.63Ni_0.48PS₃ and Li_0.94(H₂O)_0.92(PEO)_0.94Fe_0.48PS₃ obtained by the insertion of PEO in MPS₃ form lithium-polyethylene oxide complexes containing Li⁺ exchangeable cation in the interlayer space. Polyethylene oxide (PEO) is able to associate interlayer cation increasing the ionic conductivity of NiPS₃ and FePS_3. These compounds constitute a new family of intercalates MPS₃ (M = Ni, Fe) host-layer materials.The new materials were characterized by powder X-Ray diffraction (XRD), Fourier-transformed infrared (FT-IR), differential thermal and thermogravimetric analyses (DTA/TG), energy dispersive X-Ray (EDX), inductively coupled plasma (ICP) and electrochemical impedance measurements. The intercalation compound Li_0.96(H₂O)_0.77(PEO)_0.63Ni_0.48PS₃ shows an ionic conductivity of 0.13 μS/cm, and dc electronic conductivity of ca. 0.1 μS/cm which is twice that of NiPS₃.     

协同环境中3D替身交互行为动态控制的实现

协同环境中用户之间的协同感知程度和实时交互性直接影响到协同工作的质量。目前,部分CSCW 应用系统通过向虚拟协同环境CVEs 中添加3D 替身来提高用户之间的协同感和交互感。但经研究发现,其场景中所有的替身只是在用户的控制下机械地使用VRML 中提供的行为机制进行运动,替身之间也不存在交互行为,用户交互程度仍然不足。为了进一步解决这个问题,笔者着重研究了CVEs 中3D 替身之间交互行为的实现,通过替身行为机制的建立,利用VRML 和Java 实现了替身之间交互行为的动态控制,从而增强了用户的协同感和交互感,提高了协同工作的效率。