Fabrication of branch-like Aph@LDH-MgO material through organic-inorganic hybrid conjugation for excellent anti-corrosion performance

Layered double hydroxides(LDH)frameworks have shown significant enhancement in stability and reusability,and their tailorable architecture brings new insight into the development of the next generation of hybrid materials,which attracted considerable attention in many fields over the years.One of the factors contributing to the widespread applicability of layered double hydroxides is their adaptable composition,which can accommodate a wide spectrum of potential anionic guests.This exceptional property makes the LDH system simple to adjust for various applications.However,most LDH systems are synthesized in situ in an autoclave at high temperatures and pressures that severely restrict the industrial use of such coating systems.In this study,LDH was directly synthesized on a magnesium alloy that had undergone plasma electrolytic oxidation(PEO)treatment in the presence of ethylenediaminetetraacetic acid,thereby avoiding the use of hydrothermal autoclave conditions.This LDH system was compared with a hybrid architecture consisting of organic-inorganic self-assembly.An organic layer was fabricated on top of the LDH film using 4-Aminophenol(Aph)compound,resulting in a smart hierarchical structure that can provide a robust Aph@LDH film with excellent anti-corrosion performance.At the molecular level,the conjugation characteristics and adsorption mechanism of Aph molecule were studied using two levels of theory as follows.First,Localized orbit locator(LOL)-πisosurface,electrostatic potential(ESP)distribution,and average local ionization energy(ALIE)on the molecular surface were used to highlight localization region,reveal the favorable electrophilic and nucleophilic attacks,and clearly explore the type of interactions that occurred around interesting regions.Second,first-principles based on density functional theory(DFT)was applied to study the hybrid mechanism of Aph on LDH system and elucidate their mutual interactions.The experimental and computational analyses suggest that the highπ-electron density and delocalization characteristics of the functional groups and benzene ring in the Aph molecule played a leading role in the synergistic effects arising from the combination of organic and inorganic coatings.This work provides a promising approach to design advanced hybrid materials with exceptional electrochemical performance.

Synthesis and characterization of hybrid organic-inorganic materials based on EA-MAn-APTES and silica

Poly (EA-MAn-APTES)/silica hybrid materials were successfully prepared fromEthyl acrylate (EA), maleic anhydride (MAn) and tetraethoxysilane (TEOS) in the presence of acoupling agent 3-aminopropyltriethoxysilane (APTES),by free-radical solution polymerization and insitu sol-gel process. The mass fraction of TEOS varied from 0 to 25%. The hybrid materials werecharacterized by the methods of FT-IR spectra, solvent extraction, scanning electron microscope (SEM), transmission electron microscope (TEM), differential scanning calorimetry (DSC) andthermogravimetric analysis (TGA) measuring apparatus to get their structures, gel contents,morphologies, particle sizes and thermal performances. The results show that the covalent bonds arebetween organic and inorganic phases, gel contents in the hybrid materials are much higher, theSiO_2 phase is well dispersed in the polymer matrix, silicon dioxide exist at nanoscale in thecomposites and have excellent thermal stability.

Fabrication of micro-nano patterned materials mimicking the topological structure of extracellular matrix for biomedical applications

With the advent of tissue engineering and biomedicine,the creation of extracellular matrix(ECM)biomaterials for in vitro applications has become a prominent and promising strategy.These ECM materials provide physical,biochemical,and mechanical properties that guide cellular behaviors,such as proliferation,differentiation,migration,and apoptosis.Because micro-and nano-patterned materials have a unique surface topology and low energy replication process that directly affect cellular biological behaviors at the interface,the fabrication of micro-nano pattern biomaterials and the regulation of surface physical and chemical properties are of great significance in the fields of cell regulation,tissue engineering,and regenerative medicine.Herein,we provide a comprehensive review of the progress in the fabrication and application of patterned materials based on the coupling of mechanical action at the micro-and nano-meter scale,including photolithography,micro-contact printing,electron beam lithography,electrospinning,and 3D printing technology.Furthermore,a summary of the fabrication process,underlying principles,as well as the advantages and disadvantages of various technologies are reviewed.We also discuss the influence of material properties on the fabrication of micro-and nano-patterns.

Thermal Studies and Analytical Applications of a Newly Synthesized Composite Material “Polyaniline Stannic Molybdate”

Polyaniline stannic molybdate—an organic-inorganic composite material, was prepared via sol-gel mixing of organic polymer polyaniline into matrices of inorganic precipitate of stannicmolybdate. The composite material synthesized at pH 1.2 showed an ion exchange capacity 1.8 meq/g for Na+?ions. Ion exchange capacity, pH titration and distribution studies were carried out to determine the preliminary ion exchange properties of the material. The distribution studies showed the selectivity of Hg(II) ions by this material. The effect of temperature on the ion exchange capacity of the material at different temperatures had been studied. The sorption behavior of metal ions was also explored in different surfactant media.

Enhancement of superconductivity in organic-inorganic hybrid topological materials

Inducing or enhancing superconductivity in topological materials is an important route toward topological superconductivity.Reducing the thickness of transition metal dichalcogenides(e.g.WTe2 and MoTe2)has provided an important pathway to engineer superconductivity in topological matters.However,such monolayer sample is difficult to obtain,unstable in air,and with extremely low Tc.Here we report an experimentally convenient approach to control the interlayer coupling to achieve tailored topological properties,enhanced superconductivity and good sample stability through organic-cation intercalation of the Weyl semimetals MoTe2 and WTe2.The as-formed organic-inorganic hybrid crystals are weak topological insulators with enhanced Tc of 7.0 K for intercalated MoTe2(0.25 K for pristine crystal)and2.3 K for intercalated WTe2(2.8 times compared to monolayer WTe2).Such organic-cation intercalation method can be readily applied to many other layered crystals,providing a new pathway for manipulating their electronic,topological and superconducting properties.

Organic-inorganic Hybrid Materials Based on Molybdophosphate and Organic Polyammonium

A new organic-inorganic hybrid compound （dienHs）2（P2Mo5O23） （1） [dien=NH（CH2CH2NH2）2] has been hydrothermally synthesized and characterized by elemental analyses, IR spectrum, thermogravimetric analysis, and the single crystal X-ray diffraction technique. Compound 1 crystallizes in the triclinic system with space group P1 and a=0.9790（2） nm, b=0.9922（2） nm, c= 1.4644（3） nm, α=95.510（10）°, β=98.860（10）°, γ=95.700（10）°, V=1.3895（5） nm^3, Z=2, R=0.0465. The results show that the compound consists of dienH3^3＋＋ and P2Mo5O23^6-, and the heteropoly anion P2Mo5O23^6- is connected to a 1-D chain structure with the protonated dien by hydrogen bonds.

Functional-template directed self-assembly(FTDSA) of mesostructured organic-inorganic hybrid materials

Since the discovery of a surfactant directed self-assembly approach for the fabrication of mesoporous silica in 1992,increasing attention has been focused on the design and synthesis of mesostructured functional materials.Organic functionalization is becoming a major topic in this research field,since highly ordered mesostructured organic-inorganic hybrids offer novel functionalities and enhanced performance over their individual components.We begin with a brief overview of the three fundamental methods(post-synthetic grafting technique,co-condensation method,and preparation of periodic mesoporous organosilicas) for the preparation of organically functionalized mesostructured silica,and focus on one of the most promising approaches,which herein was named as functional-template directed self-assembly(FTDSA) approach,and in the eyes of the authors it has a special position in the preparation of this class of hybrid materials.A comprehensive overview of the state of research in the area of FTDSA and its potential applications will be given.

Enhanced photocatalytic hydrogen production under visible light of an organic-inorganic hybrid material based on enzo[1,2-b:4,5-b']dithiophene polymer and TiO_(2)

Titanium dioxide(TiO_(2))has been limited in photocatalysis due to its wide band gap(3.2 eV)and limited absorption in the ultraviolet range.Therefore,organic components have been introduced to hybrid with TiO_(2) for enhanced photocatalytic efficiency under visible light.Here,we report that benzo[1,2-b:4,5-b']dithiophene polymer was an ideal organic material for the preparation of a hybrid material with TiO_(2).The energy band gap of the resulting hybrid material decreased to 2.9 eV and the photocatalytic hydrogen production performance reached 745.0μmol g^(-1) h^(-1) under visible light irradiation.Meanwhile,the material still maintained the stability of hydrogen production performance after 40 h of photocatalytic cycles.The analysis of the transient current response and electrochemical impedance revealed that the main reasons for the enhanced water splitting of the hybrid materials were the faster separation of electron hole pairs and the lower recombination of photocarrier ions.Our findings suggest that polythiophene is a promising organic material for exploring hybrid materials with enhanced photocatalytic hydrogen production.

Fabrication of 2×2 Thermo-Optic Switches with Organic-Inorganic Hybrid Materials Prepared by Sol-Gel Technique

2×2 Mach-Zehnder interferometric thermo-optic switch was fabricated with organic/inorganic hybrid materials by sol-gel technique and direct UV patterning. The switching time of device was measured to be 4.2 ms and switching power 9.3 mW.

原位溶胶-凝胶法制备光固化3D打印大豆油基杂化材料及其性能分析

以2.7官能度大豆油多元醇(SBOP)与甲基丙烯酸乙酯二异氰酸酯(MOI)为原料,成功制备了2.7官能度可自由基光固化的大豆油基光敏树脂SBO-2.7A。将SBO-2.7A作为基体树脂,通过添加一定比例活性稀释剂丙烯酸羟乙酯(HEA),制备出了3D打印大豆油基光敏树脂。通过原位溶胶-凝胶法,将不同正硅酸乙酯(TEOS)添加量的大豆油基打印树脂配方进行3D打印成型,优选出最佳的酸性蒸汽后处理条件后,最终制备出具有机械性能提高的打印大豆油基材料。通过红外光谱仪、电子显微镜、哈克旋转流变仪、拉伸试验机等对3D打印树脂的黏度、光固化行为及其对3D打印样品的热力学性能、机械性能等的影响进行分析,结果表明,原位溶胶-凝胶法生成纳米SiO2使得3D打印制品拉伸性能、储能模量均得到提高,其中拉伸强度由起始的9.96 MPa增加到了14.14 MPa,提高了42%;储能模量由293 MPa提高至567 MPa,提高了93.5%。

Lateral organic-inorganic hybrid Vis-NIR photodetectors based on GaN nanowires promoting photogenerated carriers transfer

The narrow bandgap of the low-energy near-infrared(NIR)polymer would lead to overlap between adjacent energy levels,which is a major barrier to the preparation of Vis-NIR polymer bulk hetero-junction(BHJ)photodetectors with small responsivity and photocurrent.In this study,a high-performance lateral inorganic-organic hybrid photodetector was constructed to eliminate this barrier by combining GaN nanowires(GaN-NWs)with PDPP3T:PC61BM-based BHJ.In stage one,high-quality GaN-NWs were synthesized by the catalyst-free CVD method.The mechanism for controlling GaN-NWs morphology by adjusting the NH3 flow rate was revealed.In stage two,the GaN-NWs with large electron mobility were used to accelerate the transfer of photogenerated carriers in the BHJ layer.Finally,compared with the BHJ device,the BHJ/GaN device demonstrated obvious improvements in responsivity and photocurrent at the wavelength between 400 and 1000 nm.The responsivity and photocurrent increased over 20-fold at the NIR band of 800e900 nm.Besides,owing to the energy level gradient effect,the BHJ/GaN device has a response speed of 7.8/<5.0 ms,which increases over three orders of magnitude than that of the GaN-NWs-based device(tr/tf:7.1/10.9 s).Therefore,the novel device structure proposed in this work holds great potential for preparing high-performance Vis-NIR photodetectors.

Organic-inorganic Polymer Nano-hybrids Based on Sol-gel Reaction

1 Results Nano-ordered composite materials consisting of organic polymers and inorganic materials have been attracting attention for the purpose of the creation of high-performance or high-functional polymeric materials. Especially,the word of "polymer hybrid" claims the blends of organic and inorganic components at nano-level dispersion. By using this idea,an enhancement of mechanical strength of organic polymers with silica particles is possible.High transparency of this material is another important ...

聚酰亚胺/TiO_(2)纳米杂化膜的制备及表征

将间苯二胺,2,2’-双三氟甲基-4,4’-联苯二胺和2,3,3’,4’-联苯四甲酸二酐反应得到可溶性聚酰亚胺(KPI),再把KPI与TiO_(2)溶胶共混,经流延制膜并热亚胺化后得到PI/TiO_(2)纳米杂化膜。通过红外光谱、扫描电镜、透射电镜和能谱仪对PI/TiO_(2)纳米杂化膜的成分、结构和形态进行表征。结果表明,TiO_(2)已成功引入PI基体中,并以纳米尺寸均匀分布。热重分析和拉伸实验表明,TiO_(2)的引入提高了PI/TiO_(2)纳米杂化膜热的稳定性和力学性能。紫外-可见光谱表明,TiO_(2)的掺入并不影响PI/TiO_(2)纳米杂化膜的光学透过率。分别研究了PI/TiO_(2)纳米杂化膜对亚甲基蓝和刃天青的光催化活性。24h内,PI/TiO_(2)(5%)纳米杂化膜对亚甲基蓝的降解率高达96.40%,说明PI/TiO_(2)纳米杂化膜具有极强的光催化活性,能起到光催化效果的主要原因是杂化体系内含有光催化活性的TiO_(2)纳米粒子。PI/TiO_(2)杂化膜具有有效的光催化活性及潜在的抗污染自清洁能力。

纳米有机杂化材料(NOHMs)用于CO_(2)捕集的研究进展

近年来,纳米有机杂化材料(NOHMs)引起了广泛的研究。不同于捕集CO_(2)的传统胺基溶剂,NOHMs可以在不含任何溶剂的条件下保持类液性,具有可忽略蒸汽压和高热稳定性的特点,因此可以减少溶剂挥发带来的损失以及环保问题,同时减少了对设备的腐蚀,是一种有潜力的替代传统胺基溶剂的吸收剂。同时NOHMs可直接作为吸附剂吸附CO_(2),也可作为添加剂和其他材料产生协同作用,比如作为分离膜中的掺杂剂加入到聚合物基质中制备混合基质膜,可以显著强化CO_(2)在膜内的传质速率,实现CO_(2)的高效捕集。本文概括了NOHMs在碳捕集领域的研究进展,分别针对共价键和离子键连接的两类NOHMs阐述其核心、内冠、外冠三部分对CO_(2)吸附性能的影响,探讨和归纳了核心的尺寸、孔隙率、含量以及冠层的密度、链长和结构等对NOHMs碳捕集能力的影响机制,总结了以上因素与焓效应和熵效应的对应关系,以及对碳捕集性能的作用。本文将为拓宽NOHMs在CO_(2)捕集领域的应用提供参考与新的研究思路。

Facile fabrication of superior antibacterial cotton fabric based on ZnO nanoparticles/quaternary ammonium salts hybrid composites and mechanism study

In the research for the safe and efficiently antibacterial cotton fabrics to minimize risk for human health,an organic–inorganic hybrid material of ZnO nanoparticles(NPs)and quaternary ammonium salt(QAS)was employed to modify cotton fabrics by a dipping–padding–drying method.The synergistic effects of ZnO NPs and QAS on the structure and antibacterial properties of cotton fabrics were studied in detail.Results displayed that the QAS and ZnO NPs were immobilized firmly in cotton fabric by the formation of chemical covalent bonds and silica gel structure.ZnO/QAS/cotton had a good inhibitory effect on the growth of E.coli and S.aureus,with superior antibacterial efficiency of>99.99%.ZnO/QAS/cotton preserved good mechanical property,water absorbability,and limpness.We also provided a detailed analysis of antibacterial mechanism for the hybrid materials.The contact mechanism and the Zn2+release were considered as the main mechanisms for the ZnO/QAS/cotton,while the reactive oxygen species(ROS)generation only had a little contribution to the antibacterial activity.In short,the excellent integrated properties endowed the hybrid cotton fabrics as potential application in many fields,like healthcare,food packaging.

An Organic–Inorganic Hybrid Material Based on Benzo[ghi]perylenetri-imide and Cyclic Titanium-Oxo Cluster for Efficient Perovskite and Organic Solar Cells

Perovskite and organic solar cells usually require electron-transport interlayers to efficiently transport electrons from the photoactive layer to the metal electrode.In general,pure organic or inorganic materials are applied into the interlayers,but organic–inorganic hybrid materials have been rarely reported for this application.In this work,we report using the first titanium-oxo cluster-based organic–inorganic hybrid as the interlayer material by introducing largeπ-conjugated benzo[ghi]perylenetriimides as an organic part via a simple ligand-exchange reaction.This new hybrid material showed excellent solubility,well-aligned energy levels,and excellent electron mobilities,enabling its great potential application as an interlayer in solar cells such as perovskite and organic solar cells,providing high power conversion efficiencies of>20%and 16%,respectively.Therefore,we claim that our present work introduces a new class of cluster-based organic–inorganic hybrid interlayer materials that exhibit promising application in organic electronics.

混合纳米流体余热回收装置强化换热机理综述研究

随着科学技术的进步,能源短缺问题日益严峻,传统的换热工质已经不能满足工业的需要,纳米流体作为一种新兴的换热工质受到越来越多的关注。而混合纳米流体作为单纳米流体的延伸,具有更全面更优越的性能。但是各颗粒之间的相互作用导致混合纳米流体的传热机制更加复杂,为了在实际中更好地应用混合纳米流体,所以研究影响混合纳米流体热导率的因素是必要的。介绍了混合纳米流体的制备方法以及影响混合纳米流体热导率的相关因素。

杂化材料的制备、性能及应用

较详细地介绍了杂化材料的概念及其制备方法、性能和应用。重点是有机高分子 -无机杂化材料的制备、性能及应用。

溶胶凝胶法在聚合物/无机纳米复合材料中的应用

本文对溶胶凝胶法在聚合物 无机纳米复合材料中的应用进行了综述。并对溶胶凝胶法在橡胶增强、光学仪器、功能化涂层以及其它领域中的应用进行了具体的讨论。指出溶胶凝胶过程工艺条件的优化以及分散介质范围的扩大将是溶胶凝胶法在聚合物 无机纳米复合材料中应用的发展方向。

聚丙烯酸酯/TiO_2-SiO_2纳米杂化材料的制备与表征

用原位复合、溶胶-凝胶法制取热固性聚丙烯酸酯基纳米SiO2包覆TiO2的有机-无机纳米杂化材料,通过红外光谱(FT-IR)、透射电镜(TEM)、扫描电镜(SEM)、X射线能量色散谱仪(EDAX)、紫外-可见光谱(UV-Vis)等对材料的结构和性能进行了表征,通过实验证明了纳米TiO2-SiO2复合物对紫外线有很好的吸收性能,应用到丙烯酸树脂材料中具有很好的紫外线屏蔽效果。