The preparation of high performance carbon electrode in electrochemical oxygen generator

The electrochemical oxygen generator has been popularized for its virtues, such as high oxygen concentration output, electricity saving, easy operation and maintenance. The key part of electrochemical oxygen generator is carbon electrode used as the cathode. The preparation of high performance carbon electrode was introduced in this paper. The properties of carbon electrode was tested. The electrochemical oxygen generator using carbon electrode as the cathode was prepared. The oxygen concentration and flow of this machine is hi,yher thnn ｜hal of others in china.

Economical operation of Baosteel's oxygen generating system

Baosteel＇s 60000 m^3/h air separation unit （ASU） is the largest oxygen generating system in China. The operational cost of such a giant system is very high. How to reduce the operational cost is a critical issue. This paper discusses the system＇s characteristics,the current operational status and the difficulties in reducing the cost,and analyzes relevant indicators, such as the technical and economical indicators of individual units and systems as well as the indicators concerning the costs. The relationship between the cost and each economical indicator and measures to optimize an economical operation of the oxygen generating system are also discussed in this paper.

O_(2)-generating multifunctional polymeric micelles for highly efficient and selective photodynamic-photothermal therapy in melanoma

Photothermal therapy(PTT)and photodynamic therapy(PDT)have received tremendous attention owing to their great potential for tumor treatment.However,two main issues hamper the antitumor performance of PDT:overexpression of glutathione(GSH)in tumors,which consumes PDT-induced reactive oxygen species(ROS),and hypoxia within the tumor microenvironment.The drawbacks of PTT include uneven temperature distribution and the upregulation of the heat-shock proteins in tumors,both of which result in ineffective treatment.To address these issues,a MnO_(2)doped nano-delivery system(HTIM-PMs)was synthesized by one-step self-assembly of disulfide bond bridged copolymers for indocyanine green(ICG)and MnO_(2)loading.The surface of polymeric micelles was layered with hyaluronan(HA)and transactivator(TAT)peptides to improve active targeting and increase cell penetration.After internalization,HTIM-PMs showed responsiveness to the tumor microenvironment(acid pH,high glutathione,high H_(2)O_(2)).Breaking the disulfide bond reduced the intratumoral GSH level and simultaneously released the MnO_(2)and ICG.The released MnO_(2)further reduced the GSH level and promoted O_(2)generation,thus enhancing the PDT effect.The PTT-mediated hyperthermia accelerated blood flow,which is beneficial for O_(2)distribution,and promotes ROS diffusion.These PTT-mediated adjuvant effects further overcame the limitations of PDT and the robust PDT effect in turn compensated for the deficiency of PTT.This promising platform exhibited a significant improvement in the PTT-PDT cancer treatment strategy compared to previously reported nanostructures.