Ultralight Magnetic and Dielectric Aerogels Achieved by Metal-Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption

The development of a convenient methodology for synthesizing the hierarchically porous aerogels comprising metal–organic frameworks(MOFs)and graphene oxide(GO)building blocks that exhibit an ultralow density and uniformly distributed MOFs on GO sheets is important for various applications.Herein,we report a facile route for synthesizing MOF/reduced GO(rGO)aerogels based on the gelation of GO,which is directly initiated using MOF crystals.Free metal ions exposed on the surface of MIL-88A nanorods act as linkers that bind GO nanosheets to a three-dimensional porous network via metal–oxygen covalent or electrostatic interactions.The MOF/rGOderived magnetic and dielectric aerogels Fe_(3)O_(4)@C/rGO and Ni-doped Fe_(3)O_(4)@C/rGO show notable microwave absorption(MA)performance,simultaneously achieving strong absorption and broad bandwidth at low thickness of 2.5(-58.1 dB and 6.48 GHz)and 2.8 mm(-46.2 dB and 7.92 GHz)with ultralow filling contents of 0.7 and 0.6 wt%,respectively.The microwave attenuation ability of the prepared aerogels is further confirmed via a radar cross-sectional simulation,which is attributed to the synergistic effects of their hierarchically porous structures and heterointerface engineering.This work provides an effective pathway for fabricating hierarchically porous MOF/rGO hybrid aerogels and offers magnetic and dielectric aerogels for ultralight MA.

Preparation and Performance of Ternesite-Ye’Elimite Clinker Produced from Steel Slag at Lower Temperature

Ternesite(4CaO·2SiO_(2)·CaSO_(4))-Ye’elimite(3CaO·3Al_(2)O_(3)·CaSO_(4))(simplified as TY)cement clinker was successfully prepared from steel slag at 1200℃in this study.XRD,TG/DSC and SEM were used to analyze the mineral composition and hydration products of the TY clinker.The sintering process and hydration mechanism of the TY clinker were investigated.Results show that a large amount of ternesite and ye’elimite have been formed at 1200℃,while ternesite has not been decomposed.Clinker minerals include ternesite,ye’elimite,gypsum and a small amount of iron phase.Iron phase from steel slag can promote the formation of liquid phase with the presence of gypsum at 1200℃and thus lead to the coexistence of ternesite and ye’elimite.The compressive strength of TY cement cured at 28 d is 59.5 MPa,which is higher than that of P.II 42.5 cement.This research provides a sustainable and energy-effective way for the reutilization of steel slag,an otherwise valueless waste.

An in vitro study to explore the role of prolylcarboxypeptidase in non-small cell lung cancer

Prolylcarboxypeptidase(PRCP)belongs to the S28 family of proteases,which is also a dipeptidyl peptidase.In this study,we demonstrate the expression pattern of PRCP in Non-small cell lung cancer(NSCLC).We found that the repression of PRCP expression by small interfering RNA successfully inhibited cell proliferation,migration,and invasion.Further,we explored the involvement of PRCP in the regulation of epithelial-mesenchymal transition(EMT).The epithelial marker E-cadherin was significantly increased,meanwhile mesenchymal markers MUC1,vimentin,and SNAIL were markedly decreased in PRCP knockdown cells.Moreover,the downregulation of PRCP in the NSCLC cells induced the expression of apoptosis-related proteins in vitro.We performed RT-PCR in 30 pairs of clinical NSCLC tissues and adjacent non-cancerous tissues,which revealed significantly higher PRCP expression levels in cancer tissues than in adjacent non-cancerous tissues.Collectively the results from our study suggest a possible cancer promotion role of PRCP in NSCLC.

多孔配位聚合物:发展历程及研究进展

多孔配位聚合物(PCP)(包括金属有机框架)是一类由金属节点和配体通过配位键连接形成的晶态多孔材料.作为一类新兴的无机-有机杂化材料, PCP具有丰富且可调节的结构和功能,因此其在气体吸附分离、催化、传感等诸多领域展现出巨大的应用潜力,是多学科交叉的研究热点.本文依据PCP的结构及性质特点,总结了第一至第四代多孔配位聚合物PCP研究的发展历程,介绍了该领域的主要研究内容和典型研究进展,进而基于该领域未来面临的挑战和发展趋势分析了材料的实用化前景.