We studied the effect of titanium dioxide (TiO₂) nanoparticles (NPs) on dielectric behavior of Na+ ion-conducting salt-complexed polymer nanocomposite system formed from a binary polymer blend of poly(ethylene oxide) (PEO) and polyvinyl pyrrolidone (PVP), with the addition of both sodium metaperiodate (NaIO₄) at concentration 10wt.% and TiO₂ NPs of size ∼10nm, at concentrations 1, 2, 3, 4 and 5wt.%. Free standing nanocomposite PEO/PVP/NaIO₄/TiO₂ films (150μm) were characterized at room-temperature by analyzing their complex electrical impedance and dielectric spectra in the range 1Hz–1MHz. At the concentration of 3wt.% of TiO₂ NPs, both ion conductivity and dielectric permittivity of the PEO/PVP/NaIO₄/TiO₂ ion-conducting dielectrics reach an enhancement by more than one order of magnitude as compared to nanoadditive-free case.

载流子在等离激元金属纳米粒子上的快速复合, 导致传统的光电催化剂效率显著降低, 通过金属和半导体的复合可实现热电子和空穴的分离以提升光电催化效率。 采用Ag纳米粒子与半导体TiO2纳米粒子复合提高其光电催化活性, 并探索了催化活性提升的机理, 研究了TiO2-Ag纳米复合材料之间空间电荷区能带弯曲以及内置电场的作用, 为设计高性能SPR光电催化剂提供理论和实验依据。 以对氨基苯硫酚(PATP)及对硝基苯硫酚(PNTP)的光电催化偶联反应为探针, 研究了TiO2-Ag纳米复合材料的催化性能。 结果表明TiO2的引入提高了Ag的SPR催化活性, 其主要原因是TiO2的引入可提高TiO2-Ag间电子和空穴的分离效率。

纳米水化硅酸钙(CSH)是硅酸盐水泥的高效早强晶核剂。以柠檬酸为分散稳定剂，采用成核晶化隔离法合成CSH/柠檬酸纳米复合物，研究了柠檬酸用量对CSH/柠檬酸纳米复合物(CCNs)结构、粒度分布的影响以及CCNs对水泥水化硬化的作用机理。结果表明：柠檬酸可插层进入纳米CSH层间，CCNs的平均粒径在90~160 nm之间，且CCNs中柠檬酸含量越高，其粒径越小，在pH=13的碱性溶液中释放出的柠檬酸越多。CCNs由于自身晶核及柠檬酸的协同作用影响水泥水化，改善了孔结构并提高了12 h、1 d、3 d、7 d及28 d抗压强度。

Dielectric properties and structure of pure and carbon-modified nanocomposites on the base of porous glasses with an average pore diameter of 6 nm (PG6) with embedded KNO₃ have been studied at the temperature diapason of 300–430 K and at frequencies of 0.1–3 × 10⁶ Hz on cooling. X-ray diffraction studies of these samples have shown, that in modified and unmodified composites there is a mixture of the low-temperature paraelectric phase (α-phase) and the ferroelectric γ-phase. In modified composites, a decrease in permittivity and conductivity is observed. Dielectric response has been analyzed in the framework of modern theoretical models. Two relaxation processes have been identified and their origin has been determined. It has been found that the main contribution to the dielectric response of nanocomposite material PG6+KNO₃ is provided by charge polarization on interfaces, which can be governed by modifying the inner pore surfaces. DC-conductivity of both composites has been estimated and the activation energies have been determined. Activation energy change observed in a vicinity of 360 K is attributed to the phase transformation and the appearance of KNO₃α-phase.Dielectric properties and structure of pure and carbon-modified nanocomposites on the base of porous glasses with an average pore diameter of 6 nm (PG6) with embedded KNO₃ have been studied at the temperature diapason of 300–430 K and at frequencies of 0.1–3 × 10⁶ Hz on cooling. X-ray diffraction studies of these samples have shown, that in modified and unmodified composites there is a mixture of the low-temperature paraelectric phase (α-phase) and the ferroelectric γ-phase. In modified composites, a decrease in permittivity and conductivity is observed. Dielectric response has been analyzed in the framework of modern theoretical models. Two relaxation processes have been identified and their origin has been determined. It has been found that the main contribution to the dielectric response of nanocomposite material PG6+KNO₃ is provided by charge polarization on interfaces, which can be governed by modifying the inner pore surfaces. DC-conductivity of both composites has been estimated and the activation energies have been determined. Activation energy change observed in a vicinity of 360 K is attributed to the phase transformation and the appearance of KNO₃α-phase.

Nanoparticles succeeded to enhance the dielectric properties of industrial insulation but the presence of voids inside the power cable insulation still leads to formation high electrical stress inside power cable insulation material and collapse. In this paper, the dielectric strength of new design nanocomposites has been deduced as experimental work done to clarify the benefit of filling nanoparticles with different patterns inside dielectrics. Also, it has been studied the effect of electrical stress distribution in presence of air, water and copper impurities with different shapes (cylinder, sphere and ellipse) inside insulation of single core. In simulation model, it has been used finite element method (FEM) for estimating the electrostatic field distribution in power cable insulation. It has been applied new strategies of nanotechnology techniques for designing innovative polyvinyl chloride insula-tion materials by using nanocomposites and multi-nanocomposites. Finally, this research succeeded to remedy different partial discharges (PD) patterns according to using certain types and concentrations of nanoparticles.

This paper presents the modification occurred to the dielectric strength feature of low density polyethylene compounded with nano magnesia (LDPE/MgO). MgO nanoparticles were prepared using sol–gel technique, MgO filler surface was functionalized to improve the interfacial bonding. Specimen’s groups of composites with different filler concentrations were fabricated by mix blend method. Samples exposed to various salinity media by immersion, dielectric strength test was applied on each set according .material. Tests results utilized to learn Artificial Neural Network in order to acquire the value of dielectric strength of compounds having similar composition but containing different doping amounts or influenced with various salinity level media. The dielectric strength is enhanced by the addition of MgO nanofiller. From the investigation of the obtained results, it is concluded that additives of 1.4% filler concentration by weight is the optimum MgO content for LDPE/MgO nanofiller material. We think that this paper may promote a good researching methodology that gather both empirical work and numerical tools in this field.