有机共轭自组装材料及应用

超分子化学自组装的重要研究内容是组装体的分子设计、合成及其组装过程。为了构筑和调控某些具有特殊功能的超分子自组装体,针对不同的应用要求,可引入具有独特光电性质及刚性的有机π-共轭分子作为基本组装单元,通过超分子弱相互作用组装成功能性纳米/微米材料。总结了近年来国内外有机共轭分子的自组装行为,并介绍了其在纳米/微米光波导材料、有机小分子光电器件、分子机器及超分子传感器中的相关应用。     

Ferroelectric Thin-Film Capacitors and Piezoelectric Switches for Mobile Communication Applications

Thin-film ferroelectric capacitors have been integrated with resistors and active functions such as ESD protection into small, miniaturized modules, which enable a board space saving of up to 80%. With the optimum materials and processes, integrated capacitors with capacitance densities of up to 100 nF/mm>² for stacked capacitors combined with breakdown voltages of 90 V have been achieved. The integration of these high-density capacitors with extremely high breakdown voltage is a major accomplishment in the world of passive components and has not yet been reported for any other passive integration technology. Furthermore, thin-film tunable capacitors based on barium strontium titanate with high tuning range and high quality factor at 1 GHz have been demonstrated. Finally, piezoelectric thin films for piezoelectric switches with high switching speed have been realized.     

共轭聚合物的电学性质及其应用

共轭聚合物的显著特点是随着掺杂或去掺发生金属－绝缘体的可逆转变，本文评述和介绍了共轭合物结构和这些独特的电学性质及其讨论了多种的可能应用，如作为导电体，电子元件，电磁屏蔽，电容器，二次电池及传感器等。     

A Highly Emissive Conjugated Polyelectrolyte Vector for Gene Delivery and Transfection

An intrinsically fluorescent cationic polyfluorene ( CCP ) has been designed, synthesized, characterized, and examined as a plasmid DNA (pDNA) delivery vector. This material facilitates nucleic acid binding, encapsulation and efficient cellular uptake. CCP can effectively protect pDNA against nuclease degradation, which is necessary for gene carriers. Green fluorescent protein (GFP) expression experiments reveal that CCP can achieve efficient delivery and transfection of pDNA encoding GFP gene with 92% efficiency, which surpasses that of commercial transfection agents, lipofectamine 2000 (Lipo) and polyethylenimine (PEI). CCP is also highly fluorescent, with 43% quantum yield in water, and exhibits excellent photostability, which allows for real‐time tracking the location of gene delivery and transfection. These features and capabilities represent a major step toward designing and applying conjugated polymers that function in both imaging and therapeutic applications.     

离子交换膜金属复合材料的特性及应用

离子交换膜金属复合材料以其良好的致动性和传感性引起了广泛的关注,结合近年来的研究成果,介绍IPMC在静电压作用下的机械特性,在交变电压作用下挠曲变形饱和状态与驱动电压和频率的关系,描述材料的制备方法和关键技术,分析它的致动机理.介绍了IPMC作为人工智能材料在不同领域的应用情况,并对由它制作的致动器在当前研究中存在的问题进行了分析阐述,指出未来研究的工作重点.     

Highly Scalable and Robust Mesa-Island-Structure Metal-Oxide Thin-Film Transistors and Integrated Circuits Enabled by Stress-Diffusive Manipulation

The increasing interest in flexible and wearable electronics has demanded a dramatic improvement of mechanical robustness in electronic devices along with high-resolution implemented architectures. In this study, a site-specific stress-diffusive manipulation is demonstrated to fulfill highly robust and ultraflexible amorphous indium–gallium–zinc oxide (a-IGZO) thin-film transistors (TFTs) and integrated circuits. The photochemically activated combustion sol–gel a-IGZO TFTs on a mesa-structured polyimide show an average saturation mobility of 6.06 cm² V⁻¹ s⁻¹ and a threshold voltage of −0.99 V with less than 9% variation, followed by 10 000 bending cycles with a radius of 125 μm. More importantly, the site-specific monolithic formation of mesa pillar-structured devices can provide fully integrated logic circuits such as seven-stage ring-oscillators, meeting the industrially needed device density and scalability. To exploit the underlying stress-diffusive mechanism, a physical model is provided by using a variety of chemical, structural, and electrical characterizations along with multidomain finite-element analysis simulation. The physical models reveal that a highly scalable and robust device can be achieved via the site-specific mesa architecture, by enabling generation of multineutral layers and fine-tuning the accumulated stresses on specific element of devices with their diffusion out into the boundary of the mesa regions.     

Ultrasensitive and Highly Stretchable Multiple-Crosslinked Ionic Hydrogel Sensors with Long-Term Stability

Flexible hydrogels are receiving significant attention for their application in wearable sensors. However, most hydrogel materials exhibit weak and one-time adhesion, low sensitivity, ice crystallization, water evaporation, and poor self-recovery, thereby limiting their application as sensors. These issues are only partly addressed in previous studies. Herein, a multiplecrosslinked poly(2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide-co-acrylamide)(P(SBMA-co-AAm)) multifuncti...     

高速切削加工的特点及应用

随着 NC 和 CNC 技术的迅速发展和日益普及,HSM 即使用高速切削机械的加工技术已越来越受到人们的重视。HSM 不仅可以提高加工效率,降低成本,而且可以提高加工精度,改善加工质量。同时,HSM 的发展又对主轴系统、进给系统、CNC 控制系统、刀具、刀具夹持系统等各方面提出了新的要求。本文对高速切削的特点及实现高速切削加工的要求做一些具体的分析。     

有机-无机离子纳米粒子的合成及在聚合物中的应用研究进展

有机-无机离子纳米粒子在无溶剂的条件下具备类似于液体的流动性、导电性能和耐热性能好、粒子自组装有序排列、呈现单分散核-壳粒子、结构稳定及具有绿色环保性等优点,能在纳米材料领域广泛应用。重点介绍了有机-无机离子纳米粒子的制备方法、分类、原理及在高分子复合材料领域的应用前景,并指出其在实际应用中遇到的瓶颈。     

声子晶体的能带结构和潜在应用

声子晶体是近10年来提出的一种具有声子能带和带隙的新型声学功能材料,它具有奇特的调节声子传播状态的特性.综述了声子晶体的能带结构和潜在的应用.     

Stimulated Polariton Scattering in Semiconductor Microcavities: New Physics and Potential Applications

Stimulated polariton scattering in semiconductor microcavities is reported. The phenomena arise from the bosonic character of the coupled exciton–photon modes of the system. The ability to manipulate and control the polariton dispersions in microcavities is shown to be a key factor underlying the new observations. The potential of such phenomena to form the basis of a new type of coherent light source (“polariton” lasers) and highly efficient optical parametric oscillators is discussed.