Harbin Engineering University

About: Harbin Engineering University is a education organization based out in Harbin, Heilongjiang, China. It is known for research contribution in the topics: Control theory & Microstructure. The organization has 31149 authors who have published 27940 publications receiving 276787 citations. The organization is also known as: HEU.

Self-healing mechanisms of water triggered smart coating in seawater

Abstract: Scratched alkyd varnish coating (AVC), with isophorone diisocyanate (IPDI) microcapsules as functional additives, display self-healing properties. Here we investigated the mechanism of the self-healing process using a water trigger in seawater. Electrochemical impedance spectroscopy was used to monitor the self-healing efficiency. A detailed examination of the penetration of seawater into the crevice, the self-healing process along the crevice, the self-healing process of seawater penetrating into the coating and failure process of the coating was carried out. The self-healing time of IPDI-AVC was influenced by different metal substrates and self-healing could be inhibited by active metals such as Q235 steel. Due to the formation of a thin metal-oxide layer on the metal surface, other metals, such as 5083 aluminum alloy, titanium and copper, had much less influence on the self-healing time of IPDI-AVC. This study enhances the comprehension of the mechanism of self-healing AVC functionalized by the addition of microcapsules.

MXene-Derived Defect-Rich TiO 2 @rGO as High-Rate Anodes for Full Na Ion Batteries and Capacitors

Abstract: Sodium ion batteries and capacitors have demonstrated their potential applications for next-generation low-cost energy storage devices. These devices's rate ability is determined by the fast sodium ion storage behavior in electrode materials. Herein, a defective TiO2@reduced graphene oxide (M-TiO2@rGO) self-supporting foam electrode is constructed via a facile MXene decomposition and graphene oxide self-assembling process. The employment of the MXene parent phase exhibits distinctive advantages, enabling defect engineering, nanoengineering, and fluorine-doped metal oxides. As a result, the M-TiO2@rGO electrode shows a pseudocapacitance-dominated hybrid sodium storage mechanism. The pseudocapacitance-dominated process leads to high capacity, remarkable rate ability, and superior cycling performance. Significantly, an M-TiO2@rGO//Na3V2(PO4)3 sodium full cell and an M-TiO2@rGO//HPAC sodium ion capacitor are fabricated to demonstrate the promising application of M-TiO2@rGO. The sodium ion battery presents a capacity of 177.1 mAh g−1 at 500 mA g−1 and capacity retention of 74% after 200 cycles. The sodium ion capacitor delivers a maximum energy density of 101.2 Wh kg−1 and a maximum power density of 10,103.7 W kg−1. At 1.0 A g−1, it displays an energy retention of 84.7% after 10,000 cycles.

Au25 cluster functionalized metal–organic nanostructures for magnetically targeted photodynamic/photothermal therapy triggered by single wavelength 808 nm near-infrared light

Abstract: Near-infrared (NIR) light-induced cancer therapy has gained considerable interest, but pure inorganic anti-cancer platforms usually suffer from degradation issues. Here, we designed metal–organic frameworks (MOFs) of Fe3O4/ZIF-8-Au25 (IZA) nanospheres through a green and economic procedure. The encapsulated Fe3O4 nanocrystals not only produce hyperthemal effects upon NIR light irradiation to effectively kill tumor cells, but also present targeting and MRI imaging capability. More importantly, the attached ultrasmall Au25(SR)18− clusters (about 2.5 nm) produce highly reactive singlet oxygen (1O2) to cause photodynamic effects through direct sensitization under NIR light irradiation. Furthermore, the Au25(SR)18− clusters also give a hand to the hyperthemal effect as photothermal fortifiers. This nanoplatform exhibits high biocompatibility and an enhanced synergistic therapeutic effect superior to any single therapy, as verified by in vitro and in vivo assay. This image-guided therapy based on a metal–organic framework may stimulate interest in developing other kinds of metal–organic materials with multifunctionality for tumor diagnosis and therapy.

Facile synthesis and enhanced H2S sensing performances of Fe-doped α-MoO3 micro-structures

Abstract: Fe-doped α-MoO3 micro-structures were fabricated by a hydrothermal method, in which the Fe doping amount was easily adjusted to be 0.3, 0.6, 0.7 and 0.9 wt.% by only increasing the reaction time. X-ray diffraction and the energy dispersive spectroscopy analyses as well as the difference in the color between the doped and undoped samples provided the evidences for the Fe doping. It was also found that an appropriate Fe doping amount was beneficial to the improvement of H2S sensing performances. The enhanced gas sensing properties of the Fe-doped α-MoO3 sensors were attributed to the small size effect, catalytic effect of Fe dopants, surface reaction dynamics, and the increase in the resistance of the doped samples.