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Intelligent deformation of biomedical polyurethane

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Frontiers of Materials Science 2021年第1期15卷 1-9页

作者： maolan ZHANG Huan WANG junjie mao Da SUN Xiaoling LIAO Institute of Biomedical Engineering Chongaing Engineering Laboratory of NanoMicro Biological Medicine Detection TechnologyChongqing University of Science and TechnologyChongqing 401331China Institute of Life Sciences&Biomedicine Collaborative Innovation Center Wenzhou UniversityWenzhou 325035Chinal

Polyurethane is a general term for a class of polymerscontaining a carbamate group(-NHCOO-)in its mainchain structure,including thermoplastic elastomers,flexi-ble and rigid foams,and other species[1-2].The existenceof thermodynamically incompatible soft segments and hardsegments in the structure of polyurethane can causemicrophase separation,which gives polyurethane somesuperior *** performance can be adjusted byredesigning the proportion and the structure of soft andhard segments[3-5].

关键词： polyurethane structure separation

Theoretical screening of cooperative N-bridged dual-atom sites for efficient electrocatalytic nitrogen reduction with remolding insight

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Nano Research 2024年第4期17卷 3413-3422页

作者： Huimei Chen Yan Yang Chi Jiao Zhiwen Zhuo junjie mao Yan Liu Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

The electrocatalytic nitrogen reduction reaction(e-NRR)is a promising alternative method for the Haber–Bosch ***,it still faces many challenges in searching for high activity,stability,and selectivity catalysts and ascertaining the catalytic mechanism with complete ***,a series of graphene-based N-bridged dual-atom catalysts(M1-N-M2/NC)are systematically investigated via first-principle calculation and a high-throughput screening *** result unveils that N_(2) adsorption on M1-N-M2/NC in bridge-on adsorption mode can effectively break the scaling relationship on single-atom catalysts(SACs).Moreover,V-N-Ru/NC and V-N-Os/NC are systematically screened out as promising e-NRR catalysts,with extremely low limiting potentials of-0.20 and-0.18 V,***,the adsorption site competition between*N_(2) and*H,as well as the competitive twin reactions of hydrogen evolution reaction(HER)on intermediates(N_(n)H_(m))during the e-NRR process,is systematically evaluated to form a remodeling insight for the reactions in mechanism,and the e-NRR of new proposed dual-atom catalysts(DACs)is strategically optimized for its high-efficiency performance potential via our remolding insight in e-NRR *** work provides new ideas and insights for the design and mechanism of e-NRR catalysts and an effective strategy for rapidly screening highly efficient e-NRR catalysts.

关键词： nitrogen reduction dual-atom catalysts high-throughput screening hydrogen evolution reaction density functional theory calculations

Precorrected-FFT method for EM scattering from composite metallic-dielectric objects

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Chinese Science Bulletin 2010年第7期55卷 656-663页

作者： CHEN ZhongKuan CHAI ShunLian YANG Hu mao junjie College of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

The volume-surface integral equation(VSIE) ,the surface integral equation(SIE) and the volume integral equation(VIE) of EM scattering problem are converted into linear equations with the method of moment,then the precorrected-FFT method is used to solve the linear *** overcome the drawback of conventional stencil topology,two kinds of improved stencil topology,stencil topology B and stencil topology C,are presented,and the construction and actual performance of the three kinds of stencil topology are *** results show that good agreement is observed between the P-FFT solutions combined with each of the three kinds of stencil topology and the standard *** B can significantly reduce the number of near-zone *** C potentially holds for parallel multilevel P-FFT since grid overlapping never occurs between any stencils.

关键词：预修正快速傅里叶变换方法电磁散射表面积分方程拓扑结构线性方程组复合问题转换结构拓扑

Single-atom electrocatalysis: a new approach to in vivo electrochemical biosensing

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Science China Chemistry 2019年第12期62卷 1720-1724页

作者： Hanfeng Hou junjie mao Yunhu Han Fei Wu Meining Zhang Dingsheng Wang Lanqun mao Yadong Li Department of Chemistry Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Department of Chemistry Tsinghua UniversityBeijing 100084China Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Key Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China

Modulation of interfacial electron transfer has been proven to pave a new approach to in vivo electrochemical monitoring of brain chemistry;however,designing and establishing highly efficient electrocatalytic scheme towards neurochemicals remain a longstanding ***,we find that recently established single-atom catalyst(SAC)can be used for catalyzing the electrochemical process of physiologically relevant chemicals and thus offers a new avenue to in vivo electrochemical *** prove this new concept,we used Co single-atom catalyst(Co-SAC),in which the atomic active sites are dispersed in ordered porous N-doping carbon matrix at atomic level,as an example of SACs for analyzing glucose as the physiologically relevant model *** found that Co-SAC catalyzes the electrochemical oxidation of hydrogen peroxide(H2O2)at a low potential of ca.+0.05 V(***/AgCl).This property was further used for developing an oxidase-based glucose biosensor that was used subsequently as a selective detector of an online electrochemical system(OECS)for continuous monitoring of microdialysate glucose in rat *** OECS with Co-SAC-based glucose biosensor as the online detector was well responsive to glucose without interference from other electroactive species in brain *** study essentially offers a new approach to in vivo electrochemical analysis with SACs as electrocatalysts to modulate interfacial electron transfer.

关键词： single-atom catalyst in vivo analysis electrocatalysis biosensor

PtAu bimetallic nanocatalyst for selective hydrogenation of alkenes over aryl halides

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Nano Research 2019年第7期12卷 1659-1662页

作者： Le Guo junjie mao Shuangxi Guo Qi Zhang Shuangfei Cai Wei He School of Pharmaceutical Sciences Tsinghua UniversityBeijing 100084China CAS Key Lab for Biomedical Effects of Nanomaterials and Nanosafety Center of Materials Science and Optoelectronics EngineeringCAS center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyUniversity of Chinese Academy of SciencesBeijing 100190China Center of Single-Atom Clusters and Nanomaterials (CAN)Key Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Key Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

Herein,we present a new strategy that for the first time achieved chemo- and enantio-selective hydrogenation of alkenes over *** to the success is that instead of using external poisons,we use the composition of the bimetallic nanocrystal catalysts to control chemoselectivity (hydrogenation of C=C bonds without cleavage of Ar-X bonds).We further show that this system combined with surface modifying chiral ligands can control the ***,after synthesizing and screening a series of easily accessible MxAuy (M = Pd,Pt;x,y= 1,3,5) bimetallic nanocrystals (9-10 nm) supported on activated carbon,we identified that PtiAui/C is a recyclable and generally applicable catalyst for the chemoselective hydrogenation of alkenes without cleaving aryl halogen ***,cinchonidine modified Pt,Aui/C is shown to be capable of enantioselective hydrogenation,as illustrated by the rapid and enantio-enriched synthesis of RIP1 inhibitor analogue 7-Br-O-Necl.

关键词： hydrogenation chemoselectivity enantioselectivity PtAu bimetallic

Large-scale production of holey carbon nanosheets implanted with atomically dispersed Fe sites for boosting oxygen reduction electrocatalysis

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Nano Research 2022年第3期15卷 1926-1933页

作者： Xuanni Lin Lei Shi Feng Liu Changcheng Jiang junjie mao Chuangang Hu Dong Liu State Key Laboratory of Organic-Inorganic Composites Center for Soft Matter Science and EngineeringCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Normal UniversityWuhu 241002China

Atomically dispersed metals stabilized by nitrogen elements in carbon skeleton hold great promise as alternatives for Pt-based catalysts towards oxygen reduction reaction in proton exchange membrane fuel ***,their widespread commercial applications are limited by complicated synthetic procedures for mass ***,we are proposing a simple,green mechanochemical approach to synthesize zeolitic imidazolate frameworks precursors for the production of atomically dispersed“Fe-N_(4)”sites in holey carbon nanosheets on a large *** thin porous carbon nanosheets(PCNs)with atomically dispersed“Fe-N_(4)”moieties can be prepared in hectogram scale by directly pyrolysis of salt-sealed Fe-based zeolitic imidazolate framework-8(Fe-ZIF-8@NaCl)*** PCNs possess large specific surface area,abundant lamellar edges and rich“Fe-N_(4)”active sites,and show superior catalytic activity towards oxygen reduction reaction in an acid *** work provides a promising approach to cost-effective production of atomically dispersed transition metal catalysts on large scale for practical applications.

关键词： mechanochemical approach scalable synthesis atomically dispersed Fe sites oxygen reduction reaction fuel cells

A study on singlet oxygen generation for tetracycline degradation via modulating the size ofα-Fe_(2)O_(3)nanoparticle anchored on g-C_(3)N_(4) nanotube photocatalyst

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Nano Research 2023年第2期16卷 2236-2244页

作者： Hongjie Zhu Minghui Li Luning Zou Youyou Hu Hongguo Hao Jianmin Dou junjie mao Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Gaotang liguo chemical plant Liaocheng 252059China

Photocatalysis is considered as an effective technique for mitigating ecological risks posed by residual tetracycline(TC).To improve the efficiency of this technique,it is necessary to enable photocatalysts to produce highly reactive species,such as singlet oxygen(1O2).However,due to the high activation energy of 1O2,photocatalysts can hardly produce 1O2 without assistance from external ***,we find that the size-reducedα-Fe_(2)O_(3)nanoparticles(~4 nm)that anchored on g-C_(3)N_(4)nanotube(α-Fe_(2)O_(3)@CNNT)can spontaneously generate ^(1)O_(2) for degradation of *** comparison,only hydroxyl radical(·OH)can be produced by g-C_(3)N_(4)nanotube loaded with~14 nmα-Fe_(2)O_(3)nanoparticles(α-Fe_(2)O_(3)/CNNT).Owing to the high reactivity of the ^(1)O_(2) species,the photocatalytic degradation rate(Kapp)of TC withα-Fe_(2)O_(3)@CNNT(0.056 min^(−1))was 1.8 times higher than that ofα-Fe_(2)O_(3)/*** experimental results and theoretical calculations suggested that reducing the size ofα-Fe_(2)O_(3)nanoparticles anchored on g-C_(3)N_(4)nanotube decreased the surface electron density ofα-Fe_(2)O_(3),which induces the generation of high-valent Fe(IV)active sites overα-Fe_(2)O_(3)@CNNT and turns the degradation pathway into a unique ^(1)O_(2) dominated *** study provides a new insight on the generation of ^(1)O_(2) for effective degradation of environmental pollutant.

关键词： singlet oxygen degradation pathway high-valent Fe(IV) tetracycline degradation

Kinetics process for structure-engineered integrated gradient porous paper-based supercapacitors with boosted electrochemical performance

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Nano Research 2023年第7期16卷 9471-9479页

作者： Chuanyin Xiong Yongkang Zhang Jiayu Xu Weihua Dang Xuhui Sun Meng An Yonghao Ni junjie mao College of Bioresources Chemical&Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021China University of New Brunswick Limerick Pulp&Paper CtrFrederictonNB E3B 5A3Canada College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000China

Due to their rich and adjustable porous network structure,paper-based functional materials have become a research hotspot in the field of energy ***,reasonably designing and making full use of the rich pore structure of paper-based materials to improve the electrochemical performance of paper-based energy storage devices still faces many ***,we propose a structure engineering technique to develop a conductive integrated gradient porous paper-based(CIGPP)supercapacitor,and the kinetics process for the influence of gradient holes on the electrochemical performance of the CIGPP is investigated through experimental tests and COMSOL *** results indicate that the gradient holes endow the CIGPP with an enhanced electrochemical ***,the CIGPP shows a significant improvement in the specific capacitance,displays rich frequency response characteristics for electrolyte ions,and exhibits a good rate ***,the CIGPP supercapacitor exhibits a low self-discharge and maintains a stable electrochemical performance in different electrolyte environments because of gradient *** importantly,when the CIGPP is used as a substrate to fabricate a CIGPP-PANI hybrid,it still maintains good electrochemical *** addition,the CIGPP supercapacitor also shows excellent stability and sensitivity for monitoring human motion and deaf-mute voicing,showing potential application *** study provides a reference and feasible way for the design of structure-engineered integrated paper-based energy storage devices with outstanding comprehensive electrochemical performance.

关键词： conductive gradient porous paper electrochemical performance COMSOL simulations supercapacitor sensor

Progress of photocatalytic CO_(2)reduction toward multi-carbon products

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Science China Chemistry 2024年第12期67卷 3994-4013页

作者： Jiaojiao Fang Chengyang Zhu Huiling Hu Jiaqi Li Licheng Li Haiyan Zhu junjie mao Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

The photocatalytic CO_(2)reduction reaction(CO_(2)RR)represents a promising solution to alleviate environmental and energy issues stemming from CO_(2)emissions while simultaneously enabling the production of high-value multi-carbon ***,the efficient generation of multi-carbon products remains challenging due to high kinetic barriers,sluggish C–C coupling processes,and intricate reaction *** review provides a comprehensive overview of the latest advancements in synthesizing C_(2+)products through CO_(2)photoreduction,highlighting the crucial role of active site design and the C–C coupling ***,we emphasize the correlation between the structure of active sites and the key intermediates of C–C coupling,which is fundamental for achieving deep photoconversion of CO_(2).Finally,we offer a glimpse into future challenges and prospects,outlining potential directions for the development of CO_(2)-to-multicarbon photoconversion,aiming to contribute novel insights to this exciting field.

关键词： CO_(2)reduction photocatalysis multi-carbon products C-C coupling active sites