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Nano Research 2019年第1期12卷 85-90页

作者： Hao Wu Pengju Ren Peng Zhao zhongmiao gong Xiaodong Wen Yi Cui Qiang Fu Xinhe Bao Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China State Key Lab of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China National Energy Center for Coal to Clean Fuels Synfuels China Co.LtdBeijing 101400China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Fun dame ntal un derstandi ng of chemistry confined to nano space remains a challe nge since molecules en capsulated in confined microe nviron merits are difficult to be ***,we show that CO adsorptio n on Pt(111)8nfined un der mono layer hexago nal boron nitride(h-BN)can be dynamically imaged using near ambient pressure seanning tunneling microscope(NAP-STM)and thanks to tunneling transparency of the top h-BN *** observed CO superstructures on Pt(111)in different CO atmospheres allow to derive surface coverages of CO adlayers,which are higher in the 8nfined nano space between h-BN and Pt(111)than those on the ope n Pt surface un der the same *** NAP-STM imaging data together with theoretical calculations confirm confinement-induced molecule enrichment effect within the 2D nano space,which reveals new chemistry aroused by the confined nano reactor.

关键词： two-dimensional materials confinement effect near ambient pressure scanning tunneling microscope(NAP-STM) molecule enrichment

Exploring the phase transformation in ZnO/Cu(111) model catalysts in CO_(2) hydrogenation

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Journal of Energy Chemistry 2021年第9期30卷 150-155页

作者： Rui Wang Hengwei Wang Xuefei Weng Jiuxiang Dai zhongmiao gong Changbao Zhao Junling Lu Yi Cui Xinhe Bao School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Sustainable methanol production via CO_(2) hydrogenation leads to increased interest in the understanding of active phase of Cu/ZnO/Al_(2)O_(3)(CZA) catalyst. Model catalysts of ZnO/Cu(111) with structures varied from two-dimensional planar to three-dimensional nanoparticles were prepared by atomic layer deposition(ALD) method. By combing scanning tunneling microscopy(STM) and X-ray photoelectron spectroscopy(XPS) at near-ambient pressure of CO_(2) hydrogenation, we reveal that the submonolayer ZnO/Cu(111) transformed into Cu-Zn alloy under 10 mbar CO_(2)/H_(2) at 493 K, and underwent a partial reoxidation during evacuation. The dynamic phase transformation of ZnO/Cu(111) may partly explain the existence of differences and apparently contradictory theories to account for the origin of active phase in CZA catalysts.

关键词： ZnO/Cu(111) Methanol synthesis NAP-STM NAP-XPS ALD

Palladium single atoms from melting nanoparticles on WO_(3-x) for boosted hydrogen evolution reaction

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Journal of Energy Chemistry 2024年第4期91卷 637-644页

作者： zhongmiao gong Zhigang Chen Hao Li Guang Yang Min Yuan Zhiyun Li Xueying Wan Yi Cui School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina i-lab Vacuum Interconnected Nanotech WorkstationSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina School of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials ScienceHefei National Research Center for Physical Sciences at the MicroscaleNational Synchrotron Radiation LaboratorySchool of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Surface-supported isolated atoms in single-atom catalysts(SACs)grant maximum utilization of metals in heterogeneous ***,we report a feasible pyrolysis strategy to synthesize Pd single atoms by thermally melting Pd nanoparticles on an oxygen-vacancy-rich tungsten-oxide matrix at reduction *** ambient pressure X-ray photoelectron spectroscopy was used to monitor the formation of zero-valence Pd single atoms and the increased metallic feature of WO_(3-x)***,the as-obtained zero-valence Pd single-atom catalyst exhibits a markedly boosted HER activity with a low overpotential(η_(10)=70 mV)at the current density of 10 mA/cm2and a small Tafel slope(b=68 mV/dec),nearly 150 mV and a 3,0-fold enhancement than those of Pd nanoparticles(η_(10)=220 mV,b=133 mV/dec)under the same *** addition,quasi in situ XPS results suggest the hydrogen spillover effect is more likely to occur on Pd single atoms during the electrochemical *** work may pave an interesting route for the rational design of highly-efficient single-atom catalysts,and the elucidation of corresponding enhanced reaction mechanisms by the utilization of advanced characterization techniques.

关键词： Pd WO_(3-x) Single-atom catalysts NAP-XPS HER

In-situ reconstruction of single-atom Pt on Co_(3)O_(4)for hydrogenation

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Nano Research 2023年第5期16卷 6507-6511页

作者： Sai Zhang Zhaoming Xia Wenbin Li You Wang Yong Zou Mingkai Zhang zhongmiao gong Yi Cui Yongquan Qu Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Department of Chemistry Tsinghua UniversityBeijing 100084China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Actual chemical states of single-atom metal on reducible supports remain a fiercely debated topic under reactive ***,we demonstrate that the single-atom Pt on Co_(3)O_(4)surface undergoes an in-situ reconstruction to form isolated Pt-Co bimetallic sites via reducing coordination number of Pt–O in the presence of hydrogen from both simulations and in-situ X-ray photoelectron *** modified chemical states of Pt greatly promoted H_(2)activation,thus delivering a significantly high turnover frequency of 7,448 h−1(19.5 times over Pt nanoparticles on Co_(3)O_(4))for hydrogenation of *** satisfactory selectivity of 95.2%towards cinnamyl alcohol was ascribed to a tilted adsorption configuration of reactant on the catalyst surface via aldehyde *** anticipate that the recognitions on in-situ reconstruction of single-atom catalysts(SACs)under the reducing conditions benefit the design of highly-performed hydrogenation catalysts.

关键词： single-atom catalysis(SACs) coordination environment Pt-Co bimetallic sites hydrogenation

Methane combustion over palladium catalyst within the confined space of MFI zeolite

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Chinese Journal of Catalysis 2021年第10期42卷 1689-1699页

作者： Mingyang Gao zhongmiao gong Xuefei Weng Weixiang Shang Yuchao Chai Weili Dai Guangjun Wu Naijia Guan Landong Li School of Materials Science and Engineering Nankai UniversityTianjin 300350China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina

Isolated cationic Pd species encapsulated in MFI zeolite,i.e.,Pd@MFI,have been successfully prepared via in situ hydrothermal route followed by oxidative *** as-prepared Pd@MFI samples are investigated as promising catalysts in the reaction of methane ***,Pd@H-ZSM-5 shows remarkable activity in methane catalytic combustion with a low apparent activation energy value of 70.7 kj/mol as well as good catalytic stability even in excess water *** characterization results demonstrate the strong interaction between Pd sites and zeolite framework in Pd@ZSM-5 and the efficient stabilization of isolated Pd sites by zeolite *** analyses reveal that the presence of BrΦnsted acid sites is beneficial to methane adsorption and its subsequent activation on adjacent Pd sites,constructing cooperation between Bronsted acid sites and Pd sites within the confined space of MFI zeolite toward high-efficiency methane catalytic *** reaction mechanism of methane combustion catalyzed by Pd@H-ZSM-5 model catalyst is finally discussed.

关键词： Methane combustion Palladium catalyst Zeolite Encapsulation BrΦnsted acid sites

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锆合金初始氧化行为的原位近常压XPS研究

物理化学学报 2022年第3期38卷 66-73页

作者：戴久翔龚忠苗徐诗彤崔义姚美意上海大学材料研究所上海200072 中国科学院苏州纳米技术与纳米仿生研究所纳米真空互联实验站江苏苏州215123

锆基合金由于具有低的热中子吸收截面、良好的耐腐蚀性能和力学性能等优点,通常被用于水冷核反应堆中的核燃料包壳和其他结构材料。通过在合金中添加适量的Nb元素可以有效地降低锆合金的氧化速率和吸氢分数,从而改善锆合金的耐腐蚀性能... 详细信息

锆基合金由于具有低的热中子吸收截面、良好的耐腐蚀性能和力学性能等优点,通常被用于水冷核反应堆中的核燃料包壳和其他结构材料。通过在合金中添加适量的Nb元素可以有效地降低锆合金的氧化速率和吸氢分数,从而改善锆合金的耐腐蚀性能。尽管对锆合金的耐腐蚀性能得到了广泛的认识,但关于其在接近真实氧化腐蚀条件下的原位研究一直是具有挑战性的课题。本工作中利用近常压X射线光电子能谱(NAP-XPS)原位研究了1.3×10^(−8)–1.3×10^(−1)mbar(1 mbar=100 Pa)连续分压下室温到623 K温度时两种锆基合金表面在水,氧中的初始氧化腐蚀行为。结果表明,未添加Nb和添加1%Nb的锆合金表面在初始氧化过程中锆元素都会由金属态向多种氧化态过渡。水蒸气环境下两种合金的氧化速率都要低于氧气环境。室温下无论水蒸气还是氧气环境两种合金的氧化速率都要比623 K高温情况下的慢。在623 K的氧气气氛下,未添加Nb的锆合金相较于添加1%Nb的锆合金更容易被氧化,Nb的添加一定程度上会降低氧物种的吸附能力。在室温下和623 K低水蒸气压力下,1%Nb锆合金氧化速率更快,Nb促进OH−在表面生成。而在623 K高水蒸气压力下,未添加Nb的锆合金有更易于被氧化的倾向,Nb在高温下向表面扩散并抑制OH−键的断裂,但两种样品表面短时间内都无法被完全氧化。

关键词：锆合金 Nb 初始氧化原位近常压X射线光电子能谱

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Potassium and calcium channels in different nerve cells act as therapeutic targets in neurological disorders

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Neural Regeneration Research 2025年第5期20卷 1258-1276页

作者： Qing Qiu Mengting Yang Danfeng gong Haiying Liang Tingting Chen Department of Pharmacology School of PharmacyNantong UniversityNantongJiangsu ProvinceChina Jiangsu Province Key Laboratory of Inflammation and Molecular Drug Target NantongJiangsu ProvinceChina Department of Pharmacy Longyan First Affiliated Hospital of Fujian Medical UniversityLongyanFujian ProvinceChina

The central nervous system, information integration center of the body, is mainly composed of neurons and glial cells. The neuron is one of the most basic and important structural and functional units of the central nervous system, with sensory stimulation and excitation conduction functions. Astrocytes and microglia belong to the glial cell family, which is the main source of cytokines and represents the main defense system of the central nervous system. Nerve cells undergo neurotransmission or gliotransmission, which regulates neuronal activity via the ion channels, receptors, or transporters expressed on nerve cell membranes. Ion channels, composed of large transmembrane proteins, play crucial roles in maintaining nerve cell homeostasis. These channels are also important for control of the membrane potential and in the secretion of neurotransmitters. A variety of cellular functions and life activities, including functional regulation of the central nervous system, the generation and conduction of nerve excitation, the occurrence of receptor potential, heart pulsation, smooth muscle peristalsis, skeletal muscle contraction, and hormone secretion, are closely related to ion channels associated with passive transmembrane transport. Two types of ion channels in the central nervous system, potassium channels and calcium channels, are closely related to various neurological disorders, including Alzheimer's disease, Parkinson's disease, and epilepsy. Accordingly, various drugs that can affect these ion channels have been explored deeply to provide new directions for the treatment of these neurological disorders. In this review, we focus on the functions of potassium and calcium ion channels in different nerve cells and their involvement in neurological disorders such as Parkinson's disease, Alzheimer's disease, depression, epilepsy, autism, and rare disorders. We also describe several clinical drugs that target potassium or calcium channels in nerve cells and could be u

关键词： astrocytes calcium channels central nervous system extracellular ion concentration microglia neurological disorders neurons potassium channels

Correlation analyse between thyroid hormone levels and severity of schizophrenia symptoms

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World Journal of Psychiatry 2025年第1期15卷 63-71页

作者： Qi-Hui Jiang Wei-Dong gong Department of Endocrinology and Metabolism Hengyang Central HospitalHengyang 421000Hunan ProvinceChina Breast Tumor Surgical Outpatient Hengyang Central HospitalHengyang 421000Hunan ProvinceChina

BACKGROUND The imbalance of hormone levels in the body is closely related to the occurrence and progression of schizophrenia,especially thyroid *** To study the relationship between triiodothyronine(T3),thyroxine(T4),free T3(FT3),free T4(FT4),thyroid stimulating hormone(TSH)and *** In this study,100 schizophrenia patients were selected from our hospital between April 2022 and April *** clinical data were analyzed *** on the Positive and Negative Syndrome Scale(PANSS)score,patients were divided into mild(1-3 points,n=39),moderate(4 points,n=45),and severe groups(5-7 points,n=16).Additionally,55 healthy individuals served as a control *** blood samples were collected to measure T3,T4,FT3,FT4,TSH,and cortisol concentrations,analyzing their relationship with PANSS *** The serum levels of T3,FT3,FT4,TSH and cortisol in the schizophrenia group were lower than those in the control group(P<0.05).With the increase of the severity of the disease,the concentrations of T3 and T4 decreased,while the con-centrations of TSH and cortisol increased(P<0.05).The concentrations of TSH and cortisol were positively correlated with the PANSS score,while T3 and T4 were negatively correlated with the PANSS score(P<0.05).The receiver ope-rating characteristic curve results showed that T3,T4,TSH,and cortisol had good efficacy in the diagnosis of *** results showed that decreased T3 level,decreased T4 level,decreased TSH level and increased cortisol level may be independent risk factors for *** Thyroid hormone levels are associated with the severity of schizophrenia symptoms,which can provide new solutions for the diagnosis and treatment of schizophrenia.

关键词： Thyroid hormone Schizophrenia Symptom severity Positive and Negative Syndrome Scale score Cortisol

Characteristic changes in astrocyte properties during astrocyte-to-neuron conversion induced by NeuroD1/Ascl1/Dlx2

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Neural Regeneration Research 2025年第6期20卷 1801-1815页

作者： Qing He Zhen Wang Yuchen Wang Mengjie Zhu Zhile Liang Kanghong Zhang Yuge Xu gong Chen GHM Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina

Direct in vivo conversion of astrocytes into functional new neurons induced by neural transcription factors has been recognized as a potential new therapeutic intervention for neural injury and degenerative disorders. However, a few recent studies have claimed that neural transcription factors cannot convert astrocytes into neurons, attributing the converted neurons to pre-existing neurons mis-expressing transgenes. In this study, we overexpressed three distinct neural transcription factors––NeuroD1, Ascl1, and Dlx2––in reactive astrocytes in mouse cortices subjected to stab injury, resulting in a series of significant changes in astrocyte properties. Initially, the three neural transcription factors were exclusively expressed in the nuclei of astrocytes. Over time, however, these astrocytes gradually adopted neuronal morphology, and the neural transcription factors was gradually observed in the nuclei of neuron-like cells instead of astrocytes. Furthermore,we noted that transcription factor-infected astrocytes showed a progressive decrease in the expression of astrocytic markers AQP4(astrocyte endfeet signal), CX43(gap junction signal), and S100β. Importantly, none of these changes could be attributed to transgene leakage into preexisting neurons. Therefore, our findings suggest that neural transcription factors such as NeuroD1, Ascl1, and Dlx2 can effectively convert reactive astrocytes into neurons in the adult mammalian brain.

关键词： aquaporin-4 Ascl1 astrocyte cortex Dlx2 gap junction glia-to-neuron conversion neural regeneration NeuroD1 reprogramming

黄土高原森林林下植被物种多样性及其影响因素

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东北林业大学学报 2025年第2期53卷 66-74页

作者：宫正黄河文明与可持续发展研究中心(河南大学) 开封475001

以黄土高原不同密度刺槐(Robinia pseudoacacia)林为研究对象,通过调查样地的地形及土壤理化性质,利用方差分析、线性拟合、冗余分析等方法,分析林下植被物种多样性特征,探究影响林下植被物种多样性的因素。结果表明:不同林分密度的刺... 详细信息

以黄土高原不同密度刺槐(Robinia pseudoacacia)林为研究对象,通过调查样地的地形及土壤理化性质,利用方差分析、线性拟合、冗余分析等方法,分析林下植被物种多样性特征,探究影响林下植被物种多样性的因素。结果表明:不同林分密度的刺槐林林下植被物种多样性存在显著差异(P<0.05)。刺槐林下灌木Margalef丰富度指数随坡向的增大而减小,林下草本植物Margalef丰富度指数随坡度的增加而减小。刺槐林下灌木植物物种多样性的主要影响因素是密度、坡向、土壤全氮质量分数、土壤铵态氮质量分数,草本植物物种多样性的主要影响因素是土壤速效磷质量分数。

关键词：刺槐林物种多样性影响因素冗余分析黄土高原