Sandwich-type composited solid polymer electrolytes to strengthen the interfacial ionic transportation and bulk conductivity for all-solid-state lithium batteries from room temperature to 120℃

The insurmountable charge transfer impedance at the Li metal/solid polymer electrolytes(SPEs)interface at room temperature as well as the ascending risk of short circuits at the operating temperature higher than the melting point,dominantly limits their applications in solid-state batteries(SSBs).Although the inorganic filler such as CeO_(2)nanoparticle content of composite solid polymer electrolytes(CSPEs)can significantly reduce the enormous charge transfer impedance at the Li metal/SPEs interface,we found that the required content of CeO_(2)nanoparticles in SPEs varies for achieving a decent interfacial charge transfer impedance and the bulk ionic conductivity in CSPEs.In this regard,a sandwich-type composited solid polymer electrolyte with a 10%CeO_(2)CSPEs interlayer sandwiched between two 50%CeO_(2)CSPEs thin layers(sandwiched CSPEs)is constructed to simultaneously achieve low charge transfer impedance and superior ionic conductivity at 30℃.The sandwiched CSPEs allow for stable cycling of Li plating and stripping for 1000 h with 129 mV polarized voltage at 0.1 mA cm^(-2)and 30℃.In addition,the LiFePO_(4)/Sandwiched CSPEs/Li cell also exhibits exceptional cycle performance at 30℃and even elevated120℃without short circuits.Constructing multi-layered CSPEs with optimized contents of the inorganic fillers can be an efficient method for developing all solid-state PEO-based batteries with high performance at a wide range of temperatures.

Deep oxidative desulfurization of gas oil based on sandwich-type polysilicotungstate supported β-cyclodextrin composite as an efficient heterogeneous catalyst

In this work,in order to obtain deep clean gas oil,a novel organic–inorganic hybrid(n-C4H9)4N)7H5Si2W18Cd4O68@β-cyclodextrin(abbreviated as TBA-Si WCd@β-CD)composite was synthesized by supporting quaternary ammonium salt of sandwich-type polysilicotungstate onβ-cyclodextrin(TBA-SiWCd@β-CD)as an efficient catalyst for oxidative desulfurization(ODS)of gas oil.The successful composition of the materials explained by the formation of host–guest inclusion complex,which confirmed through FTIR,UV–vis,XRD,SEM,and EDX characterization analyses.Experimental results revealed that the levels of sulfur content and mercaptan compounds of gas oil lowered with 97%removal efficiency.Compared with the ODS treatment of gas oil,the TBA-Si WCd@β-CD composite showed an outstanding catalytic performance for the oxidation of dibenzothiophene(DBT)in the prepared model fuel.The main factors that influence the desulfurization efficiency and the kinetic study of the ODS process were investigated.The prepared heterogeneous catalyst was found to give remarkable reusability for five runs without a discernible decrease in its activity.This study suggested the potential application of the TBA-Si WCd@β-CD catalyst for removal of hazardous sulfur compounds from gas oil fuel.

An Organic-inorganic Hybrid Sandwich-type Arsenotungstate [H_2dap]_2H_2[Ni(dap)_2][Ni(dap)_2(H_2O)_2]- [Ni_4(H_2O)_2(B-α-As^VW_9O_(34))_2]·8H_2O

A new organic-inorganic hybrid sandwich-type arsenotungstate[H2dap]2H2[Ni（dap）2] [Ni（dap）2（H2O）2][Ni4（H2O）2（B-α-AsVW9O34）2]·8H2O 1 （dap = 1,2-diaminopropane） has been synthesized by the reaction of Na6[AsIII2W21O69（H2O）]·nH2O, NiCl2·6H2O and dap under hydrothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction. 1 crystallizes in the monoclinic space group P21/n with a = 13.5133（19）, b = 19.043（3）, c = 17.647（2）, β = 102.585（2）°, V = 4432.0（11） 3, T = 296（2） K, Z = 2, μ = 25.350 mm–1, GOOF = 1.058, R = 0.0353 and wR = 0.0838. The molecular unit of 1 consists of two diprotonated [H2dap]2＋ cations, two protons, one four-coordinate [Ni（dap）2]2＋ cation, one six-coordinate [Ni（dap）2（H2O）2]2＋ cation, one classic tetra-NiII substituted sandwich-type [Ni4（H2O）2（B-α-AsVW9O34）2]10– polyoxoanion and eight lattice water molecules. Furthermore, some reported different types of transition-metal substituted sandwich-type polyoxoanions are summarized and compared.

Synthesis and Crystal Structure of an Infinite Sandwich-type Cu(I) Coordination Polymer: {[Cu(abpy)_2](H_3bptc)·(H_2O)}_n Constructed by a Tetracarboxylic Acid

The title compound {[Cu（abpy）2]（H3bptc）·（H2O）}n, an ion-pair complex of [Cu（abpy）2]＋ with [（H3bptc）]- （abpy = 3,3＇-dimethyl-2,2＇-bipyridine and H4bptc = 1,1＇-biphenyl-2,2＇,3,3＇-tetracarboxylic acid）, has been synthesized by a hydrothermal reaction, and its structure was deter- mined by X-ray diffraction and characterized by elemental analysis and IR spectrum. The crystal is of triclinic, space group P1 with a = 8.4955（12）, b = 15.164（2）, c = 15.303（2）, α = 105.704（3）, β = 97.374（3）, γ = 96.764（3）o, CuC40H35N4O9, Mr = 779.26, V = 1857.9（4）3, Dc = 1.393 g/cm3, F（000） = 808, μ = 0.649 mm-1, S = 1.026 and Z = 2. The final R = 0.0493 and wR = 0.1034 for 4026 observed reflections with I 2σ（I）. The copper（I） coordination polymer demonstrates a 3-D sandwich-type structure containing 2-D double H3bptc-chain layers intercalated with the [Cu（abpy）2]＋ layers by extensive hydrogen bonding interactions.

SANDWICH-TYPE THEOREMS FOR MEROMORPHIC MULTIVALENT FUNCTIONS ASSOCIATED WITH THE LIU-SRIVASTAVA OPERATOR

The purpose of this article is to obtain some subordination and superordi- nation preserving properties of meromorphic multivalent functions in the punctured open unit disk associated with the Liu-Srivastava operator. The sandwich-type results for these meromorphic multivalent functions are also considered.

Hydrothermal Synthesis and Crystal Structure of a New Sandwich-type Molybdenum Phosphate

The crystal structure of the title compound, [enH2][Fe{MoⅤ6O12(OH)3(HPO4)- (H2PO4)3}2]6en6H2O (en = H2NCH2CH2NH2), hydrothermally synthesized from a mixture of Na2MoO42H2O, Fe2(SO4)3, H3PO4, H2N(CH2)2NH2 and water, has been determined by single- crystal X-ray diffraction. The crystal is of triclinic, space group P?with a = 11.9014(1), b = 13.4246(2), c = 13.8719(2) , a = 87.465(1), b = 69.981(1), g = 64.960(1)? V = 1873.46(4) 3, Z = 1, Mr = 2997.89, F(000) = 1466, m = 2.427 mm-1 and Dc = 2.657 g/cm3. The final R = 0.0404 for 5570 observed reflections (I > 2s(I)). The structural analysis reveals that each cluster anion contains two coplanar {Mo6} rings of six edge-sharing Mo(O5OH) octahedra, and the two {Mo6} rings are linked together through one octahedral FeⅡ ion to generate a sandwich-type cluster with rigorous () symmetry. Moreover, these clusters are further linked into a three-dimensional frame- work by hydrogen bonds.

Poly(N-isopropylacrylamide)-based Vertically Sandwich-typed Hydrogel with Fast Temperature-response Speed and Its Controlled-release Characteristics

A novel poly（N-isopropylacrylamide）-based sandwich-typed hydrogel, which was featured with both ends of linear poly（N-isopropylaerylamide） （PNIPAM） chains being grafted onto cross-linked PNIPAM chains, was successfully prepared in a three-step process by a method of sequential synthesis. The proposed hydrogel displays faster and hydration/dehydration dynamic response to temperature cycling owing to linear PNIPAM chains to form big-pore structure. This work may lead to high attraction for targeting drug delivery systems, polymeric pump, sensors and so on.

Laterally Sandwich-typed Hydrogel Columns with Liner Poly(N-isopropylacrylamide) Layer:Preparation, Swelling/deswelling Kinetics and Drug Delivery Characteristics

A novel thermo-responsive hydrogel column, featured with both ends of linear poly（N- isopropylacrylarnide） （PNIPAM） chains being grafted onto cross-linked PNIPAM chains, was reported. The laterally sandwich-typed hydrogel columns were fabricated by radical polymerization in a three-step process using a method of ice-melting synthesis. The initiating path, morphology and thermoresponsive characteristics of the prepared hydrogel columns were experimentally studied. The results show that the hydrogel column obtained by the initiator inside part has more quick swelling and deswelling rates responsing to temperature cycling than other hydrogels owing to linear PNIPAM chains to form supermacroporous structure. The proposed hydrogel structure provide a new mode of the phase transition behavior for thermo-sensitive ＂smart＂ or ＂intelligent＂ monodisperse micro-actuators, which is highly attractive for targeting drug delivery systems, chemical separations, and sensors and so on.

Sandwich-Type Single-Molecule Magnets Complexes of Er(Ⅲ)with Ansa-Cyclooctatetraenyl Ligands

Many sandwich-type lanthanide complexes show extremely high energy barriers(Ueff)for the reversal of magnetization and high blocking temperatures,being the star molecules in the research area of single-molecule magnets.Herein,the preparation,structural determination,and magnetic property studies of two ansa-bridged Er-COT(COT=cyclooctatetraenyl dianion)complexes[KDME_(2)][Er((η^(8)-COT-Si^(Me2))_(2)O)](1)and[KDME_(2)][Er((η^(8)-COT-Si^(iPr2))_(2)O)]K[Er((η^(8)-COT-Si^(iPr2))_(2)O)](2)were reported.The Er(Ⅲ)ions in both complexes are sandwiched by two COT rings which are ansa-bridged by a[Si-O-Si]group.Magnetic studies reveal both complexes display slow magnetic relaxations with comparable energy barriers(228(5)K for 1,and 196(4)K for 2)and blocking temperatures(10.5 K for both complexes).The difference in the relaxation times(τ)for the two complexes was studied in details:different molecular vibrations induced by the substituents are the main reason forτfor 1 being about 10 times longer than for 2 at the same temperature above 10 K,while the quantum tunnelling of magnetization relaxation time(τQTM)for 2 is about 10 times longer than for 1 below 8 K,probably owing to the different dipolar interactions.Further rearrangement of molecular network with such ansa-bridged SMMs is promising to design molecular magnetic materials with enhanced properties or new properties.

A Sandwich-type Lateral Flow Strip Using a Split, Single Aptamer for Point-of-Care Detection of Cocaine

The sandwich-type lateral fl ow assays relying on dual aptamers with high sensitivity and specifi city have been broadly explored.However,it is unlikely to match a pair of specifi c aptamers that can bind a small molecular target(e.g.,cocaine)simultaneously due to the steric hindrance.In response,we herein introduced the strategy of“one divides into two”into the construction of sandwich-type lateral fl ow strip assay(LFSA).Specifi cally,we split a single cocaine-recognizing aptamer into two segments,either of which was conjugated with gold nanoparticles(AuNPs)or labeled with biotin,serving as signal probe and capture probe,respectively.Upon the presence of the target molecule,a ternary sandwich complex comprised of the two halves of the aptamer and the target formed.Such sandwich-type LFSA exhibited an excellent nonlinear logarithmic response in the range from 10μmol/L to 5 mmol/L with R^(2)=0.9994.The sensitive on-site detection of cocaine in artifi cial biological samples including urine and sweat was achieved within 15 min,with the visual limit of detection as low as 50μmol/L for urine and 200μmol/L for sweat,and the recovery rates of 83.6-107.4%.

Sandwich-type composite multilayer films of strontium titanate and barium strontium titanate and their controllable dielectric properties

It is a challenge to reduce the dielectric loss and increase the tunability of pure barium strontium titanate(BST)films for microwave tunable application because these two properties change simultaneously.Herein,a novel composite of strontium titanate(ST)and potassium-doped BST(KBST)has been designed as ST/KBST/ST sandwich-type film with various ST and KBST layers.X-ray diffraction patterns show that the film exhibits cubic perovskite polycrystalline structure composed of BST and ST phase,mainly grow along(110)crystal plane with average grain size of less than 20 nm and decreasing BST phase/ST phase ratio with increasing film thickness.Scanning electron microscope shows that no interfacial layer can be observed,indicating that ST and KBST are fully compounded.Low dielectric loss and high tunability at-10-10 V and stable and excellent dielectric properties at 1 GHz are achieved,meeting the needs of microwave tunable application at high frequency.The surface structures are also studied by other analysis methods,and ST/MgBST/ST sandwich-type film is compared.

Electronic characteristics of sandwich-type lanthanide octaethylporphyrins

The electronic behavior of sandwich-type rare earth octaethylporphyrinates Ln(oep)2 and Ln2(oep)3 (Ln=Ce, Pr and Eu) was characterized by measurements of the UV-vis or near infrared spectra and D.C. conductivity. However, the conductivity values measured at room temperature were distributed in an order of 10-7 to 10-8 S.cm-1 even after the partial oxidation of complex with the complexes with iodine and no remarkable change was observed among the complexes such as LnIV(Por2-)2 (Ln=Ce) and LnIV(Por2-)(Por.-) (Ln=Ce) or Ln2III(Por2-)3 and LnIII2(Por2-)2(Por-).

Advances in gas sensors of tetrapyrrolato-rare earth sandwich-type complexes——Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

In recent years,sandwich-type rare earth tetrapyrrole derivatives,have attracted more and more attention as material for conductimetric sensors.They have not only great chemical stability and processability,but also flexible molecular structure,which is a key to adjustable semiconductor properties.In this mini review,we focus mainly on the development of tetrapyrrolato-rare earth sandwich-type complexes as the semiconducting active layer in the gas sensors published in the last ten years(2010-2020).The main part includes two sections.In the single component gas sensing of sandwich rare earth tetrapyrrole complexes,we describe the influence factors of the single-component semiconducting active layer on the sensing performance of tetrapyrrolato-rare earth sandwich-type complexes,including substituents,central metals and π-conjugate systems.In the multi-component gas sensors,the synergistic effect between tetrapyrrolato-rare earth sandwich-type complex and other materials on improving sensitivity and conductivity has been discussed briefly.

面内驱动旋转超声电机的研究进展

超声电机利用压电陶瓷的逆压电效应和机械共振来获得其运动和力矩,具有响应快速、定位精度好、可直接驱动等诸多优点,在精密驱动、航空航天、生物医学等领域具有独特的应用优势和成功应用,已有成熟产品实现产业化。基于面内振动模态的微小型超声电机是目前相关研究最易于微小型化的一类,在微机电系统领域具有很好的应用潜力和空间。首先,介绍了超声电机的工作原理;其次,针对夹心式换能器定子结构和贴片式定子结构两种类型面内驱动旋转超声电机,从不同的结构形式、输出性能、应用研究方面归纳总结相关研究的新进展和新成果,比较分析了几种电机样机的主要性能;最后,指出需要深入研究和技术突破的几个问题。

船用C型夹层板隔声性能研究

夹层板作为一种新型结构,具有设计性强、重量轻、比刚度高、减振隔声性能好等优点,已被应用于各种工程结构。然而,其夹层结构形式种类繁多,对复杂夹层结构的隔声性能进行理论分析比较困难,亟需开展新的近似分析方法。本文针对船用C型夹层板,基于弹簧、扭簧与集中质量的等效方法,建立C型夹层板的声振耦合控制方程,利用空间谐波展开法,推导C型夹层结构的传声损失表达式,讨论夹层板系统参数对结构隔声性能的影响规律。结果表明,材料属性与夹层板结构面板的厚度对C型夹层板结构隔声性能的影响较大。同时,通过有限元仿真,验证了理论分析的有效性。

帽型加筋结构和X型夹层结构耐撞性分析

提高船体结构的耐撞性能是开展船舶碰撞研究的主要目之一。一般来说,改善船舶结构耐撞性能主要对传统的船舶加筋板结构进行耐撞性优化设计和采用全新的耐撞结构形式2个途径。为对比耐撞性有效性,采用缩尺模型准静态试验和有限元仿真分析方法,探讨了传统的船舶加筋板结构与帽型加筋结构的在球形撞头作用下的变形模式和吸能能力。结果表明,帽型加筋结构因其破裂前有较好的撞深,可以提供更好的变形吸能能力。进一步针对舷侧结构采用传统的加筋板结构、帽型加筋结构和X型夹层结构等不同设计方案,开展了有限元仿真分析,对比了不同设计方案下的舷侧结构吸能能力。结果表明,帽型加筋结构和X型夹层结构都具有良好的吸能能力,是理想的吸能单元。采用帽型加筋结构对提高舷侧结构的耐撞性是最经济和有效的,采用X型夹层结构可以使得舷侧结构得到更大的耐撞性提升,分别适用于不同船舶的舷侧结构的耐撞性能改进。

GFRP板式热阻断拉结件抗拔及双剪试验研究

为研究GFRP板式热阻断拉结件在夹芯保温墙板中的最佳锚固深度和受力方向,设计GFRP板式热阻断拉结件抗拔和双剪试验,分析其破坏形态和位移变化规律。试验结果表明:抗拔试验破坏形式为拉结件侧板断裂,锚固深度为35 mm较锚固深度为30 mm的抗拔承载力提高了9.0%,表明锚固深度越大抗拔承载力越高。双剪试验拉结件沿板面受剪的单元板极限承载力是沿板厚度方向的2.13倍,表明拉结件沿板面方向抗剪性能较好。通过抗拔及双剪试验,优化拉结件的锚固深度和受力方向,为夹芯保温墙板设计提供理论依据。

钢制金属I型夹芯板界面疲劳脱粘特性分析

[目的]针对金属I型夹芯板界面的脱粘失效破坏,开展金属夹芯板界面疲劳脱粘特性分析。[方法]基于内聚力模型理论,考虑时间历程、三维结构节点多自由度的损伤演化方程与收敛判定准则,开发适用于三维复杂结构的界面疲劳脱粘模拟程序;与焊接接头脱粘实验结果进行对比,验证所开发程序的准确性,并进一步对钢制金属I型夹芯板的界面疲劳脱粘行为进行数值模拟。[结果]结果显示,所开发的三维界面疲劳脱粘数值模拟程序与焊接接头脱粘实验间最大的模拟误差仅为14.05%;I型夹芯板承受面外载荷时,夹芯板界面处的脱粘破坏主要表现为沿焊缝方向的表面裂纹扩展,当裂纹扩展至夹芯板长度的70%左右时,裂纹开始贯穿腹板形成贯穿裂纹。[结论]所开发的三维复杂结构界面疲劳脱粘程序可以实现对金属夹芯板界面疲劳脱粘寿命的有效评估,对实际工程应用具有一定的指导意义。

M型皱褶芯材夹层板隔声性能研究

作为先进复合材料夹层结构,皱褶芯材构型多样,先前研究大多围绕V型皱褶芯材展开,鲜有对其他构型的隔声性能研究。建立垂直入射声压激励下的四边简支M型皱褶芯材夹层板数值模型,基于有限元软件对其隔声性能进行数值仿真,并将理论预测的蜂窝夹层板隔声曲线与仿真结果进行对比;基于仿真模型,研究M型皱褶芯材夹层板结构的隔声性能,讨论皱褶芯材胞元几何参数对隔声性能的定性影响规律;研究双层芯材的M型皱褶芯材夹层板上下两层芯材的相对铺设错位、铺设角度对隔声性能的影响。结果表明:上下两层芯材在胞元Z形线步长方向错位叠放时隔声效果提高,且优于同面密度的单层皱褶芯材夹层板;在上下两层芯材相对铺设角度变化时,上下层芯材轴线垂直铺设时计权隔声量最大。

{Co_(6)}簇加成的夹心型锗钨酸盐的合成、结构及电化学性质

通过水热反应合成了一个{Co_(6)}簇加成的夹心型锗钨酸盐:[Co(dien)_(2)]{[Co(dien)(H_(2)O)]_(2)[Co(dien)]_(2)[Co_(6)(en)_(2)(μ_(3)-OH)_(2)(H_(2)O)_(6)(GeW_(8)O_(31))_(2)]}·5.5H_(2)O(1),其中dien=diethylenetriamine,en=ethylenediamine。该化合物的阴离子是一个带状{Co_(6)}簇夹心的三明治型{Co_(6)}@{GeW8}2结构。通过单晶X射线衍射、元素分析、红外光谱、粉末X射线衍射和热重实验对该化合物进行了系统性地表征。通过循环伏安测试研究了该化合物的电化学性质,同时其在电催化还原亚硝酸盐实验中展现出良好的催化活性。