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Synthesis of lanthanum tris (mono-i-octyl phthalate) and its thermal stability for polyvinyl chloride

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Journal of Central South University 2001年第3期13卷 161-163页

作者： you-nian liu Yan liu Dong-ming Zeng Wan-gen Shu Cent S Univ Coll Chem & Chem Engn Changsha 410083 Peoples R China

A novel type of thermal stabilizer-lanthanum tris (mono- i -octyl phthalate) (LTMP) was synthesized by double-decomposition reaction o f sodium mono- i -octyl phthalate with lanthanum chloride at 60 ℃. Sodium m ono- i -octyl phthalate was prepared by sodium hydrate and mono- i -octy l phthalate prepared by reaction of isooctyl alcohol and phthalic anhydride in th e presence of sulfuric acid catalyst at 110 ℃. The yield of lanthanum tris (mon o- i -octyl phthalate) is about 84.5%. Its thermal stabilities were measured by heat-ageing oven test when incorporated into PVC. The experimental results show that the heat stability time is about 40min at 190 ℃ when adding 3phr (pe r hundred resin) to PVC. The thermal stability of this product is better than th at of Ca-Zn complex and basic lead salt stabilizers, and equal to that of dibut yltin dilaurate.

关键词： thermal stabilizer lanthanum salt synthesis polyvinyl ch loride

Shedding light on the reversible deactivation of carbon-supported single-atom catalysts in hydrogenation reaction

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Nano Research 2024年第6期17卷 4807-4814页

作者： Runze Chen Xiaoying Wang Jianfei Dang Songjie Yun Liqiang Wang Fangong Kong you-nian liu State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyJinan 250353China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Carbon-supported single-atom catalysts were found to suffer reversible deactivation in catalytic hydrogenation,but the mechanism is still ***,nitro compounds hydrogenation catalyzed by N-doped carbon-supported Co single atom(Co1/NC)was taken as a model to uncover the mechanism of the reversible deactivation ***1/NC exhibited moderate adsorption towards the substrate molecules(i.e.,nitro compounds or related intermediates),which could be strengthened by the confinement effect from the porous ***,substrate molecules tend to accumulate within the pore channel,especially micropores that host Co1,making it difficult for the reactants to access the active sites and finally leading to their *** situation could be even worse when the substrate molecules possess a large ***,the catalytic activity of Co1/NC could be restored via a simple thermal treatment,which could remove the adsorbates within the pore channel,hence releasing active sites that were originally inaccessible to reactants.

关键词： single-atom catalysts porous carbon support reversible deactivation mechanistic study hydrogenation reaction

Nanotandem-rocket releases messenger to disrupt metabolic communication for antitumor immunotherapy

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Nano Research 2023年第5期16卷 7095-7107页

作者： Henan Zhao Yuyan Zou Wei Wang Yihong liu Yuqing Li Bowen Jin Jianghua Li Wansong Chen you-nian liu Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Metabolic communication between intracellular metabolism and extracellular microenvironment is responsible for celluar metabolism balance and cell *** cells adaptively regulate metabolic communication to promote hyperproliferation and ***,nanotandem-rockets(hyaluronic acid modified Mg_(5)(CO_(3))_(4)(OH)_(2)(H-MCH))are developed for stepwisely disrupting metabolic communication to activate antitumor *** from the nanotandem-rocket structure,H-MCH nanoplates successively disrupt the extracellular metabolite transport and intracellular carbohydrate *** simulation together with metabolomic analysis discloses the underlying mechanism of H-MCH *** extra-/intra-celluar interruption of metabolic communication provides H-MCH nanotandem-rockets with high efficiency in tumor ***,the interference of metabolic communication reverses immunosuppression to facilitate the intratumoral infiltration of immune *** H-MCH nanotandem-rockets as an in situ vaccine,systemic antitumor immunity and immune memory effect are fabricated to eliminate tumor metastasis and *** from traditional metabolic poisons(e.g.,arsenic or cyanide),the structure of nanotandem-rockets endows chemical messengers with selective regulation to tumor metabolic communication,but with minimal influence to normal *** nanotandem-rockets provide a powerful paltform to augment the regulating actitiy of chemical messengers in metabolic *** expect our discovery of disrupting tumor metabolic communication with chemical messengers will be a powerful strategy for tumor therapy with vast practical applications.

关键词： nanotandem-rockets metabolic communication messenger carbohydrate metabolism antitumor immunotherapy

In-situ regeneration of Bi^(0) active site to renew surface activation for long-term stable and efficient CO_(2)-to-formate electrosynthesis

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Journal of Energy Chemistry 2024年第12期99卷 703-711页

作者： Haichuan He Congcheng Yang liu Deng Li Luo Yahui Jiang Liqiang Wang Yi Zhang Minghui Yang you-nian liu Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121ZhejiangChina Henan Province Industrial Technology Research Institute of Resources and Materials School of Material Science and EngineeringZhengzhou UniversityZhengzhou UniversityZhengzhou 450001HenanChina

CO_(2)-to-formate electrosynthesis with high selectivity and stability has been a long-sought ***,most catalysts undergo structural and valence state changes due to surface oxidation during operation or storage,resulting in decreased catalytic ***,we report a efficient and stable BiIn@Cu-foam electrode through the in-situ regeneration of Bi^(0) active sites to renew the surface *** electronic structure of Bi site can be regulated by introducing In,thereby enhancing the adsorption strength of**** optimized electrode exhibits over 90%FE_(formate)at a wide potential window(-0.9–-2.2 V),and formation rate for 3.15 mM cm^(-1)h^(-1).Especially,the electrode can maintain the high performance at continuously electrolysis for more than 300 h,or for more than 50 cycles,even repeated operation and storage for more than 2 *** work provides a promising candidate and new insight to construct industrially viable stable Bi-based catalyst for formate electrosynthesis.

关键词： In-situ regeneration Stability Formate Bismuth eCO_(2)RR

Cryogenic Exfoliation of 2D Stanene Nanosheets for Cancer Theranostics

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Nano-Micro Letters 2021年第6期13卷 108-125页

作者： Jiang Ouyang Ling Zhang Leijiao Li Wei Chen Zhongmin Tang Xiaoyuan Ji Chan Feng Na Tao Na Kong Tianfeng Chen you-nian liu Wei Tao The First Affiliated Hospital Department of ChemistryJinan UniversityGuangzhou 510632GuangdongPeople’s Republic of China Center for Nanomedicine and Department of Anesthesiology Brigham and Women’s HospitalHarvard Medical SchoolBostonMA 02115USA College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanPeople’s Republic of China School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun 130022Jilin ProvincePeople’s Republic of China

Stanene(Sn)-based materials have been extensively applied in industrial production and daily life,but their potential biomedical application remains largely unexplored,which is due to the absence of the appropriate and effective methods for fabricating Sn-based ***,we explored a new approach combining cryogenic exfoliation and liquid-phase exfoliation to successfully manufacture two-dimensional(2D)Sn nanosheets(SnNSs).The obtained SnNSs exhibited a typical sheet-like structure with an average size of~100 nm and a thickness of~5.1 *** PEGylation,the resulting PEGylated SnNSs(SnNSs@PEG)exhibited good stability,superior biocompatibility,and excellent photothermal performance,which could serve as robust photothermal agents for multi-modal imaging(fluorescence/photoacoustic/photothermal imaging)-guided photothermal elimination of ***,we also used first-principles density functional theory calculations to investigate the photothermal mechanism of SnNSs,revealing that the free electrons in upper and lower layers of SnNSs contribute to the conversion of the photo to *** work not only introduces a new approach to fabricate 2D SnNSs but also establishes the SnNSs-based nanomedicines for photonic cancer *** new type of SnNSs with great potential in the field of nanomedicines may spur a wave of developing Sn-based biological materials to benefit biomedical applications.

关键词： Stanene Two-dimensional Cryogenic exfoliation Cancer theranostics Nanomedicine

Artificial Macrophage with Hierarchical Nanostructure for Biomimetic Reconstruction of Antitumor Immunity

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Nano-Micro Letters 2023年第12期15卷 1-20页

作者： Henan Zhao Renyu liu Liqiang Wang Feiying Tang Wansong Chen you‑nian liu Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanPeople’s Republic of China Xiangya Hospital Central South UniversityChangsha 410008HunanPeople’s Republic of China Henan Province Industrial Technology Research Institute of Resources and Materials School of Material Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanPeople’s Republic of China College of Chemical Engineering Xiangtan UniversityXiangtan 411105HunanPeople’s Republic of China

Artificial cells are constructed from synthetic materials to imitate the biological functions of natural *** virtue of nanoengineering techniques,artificial cells with designed biomimetic functions provide alternatives to natural cells,showing vast potential for biomedical *** in cancer treatment,the deficiency of immunoactive macrophages results in tumor progression and immune *** overcome the limitation,a BaSO_(4)@ZIF-8/transferrin(TRF)nanomacrophage(NMΦ)is herein constructed as an alternative to immunoactive *** to natural immunoactive macrophages,NMΦis stably retained in tumors through the specific affinity of TRF to tumor ***^(2+)as an“artificial cytokine”is then released from the ZIF-8 layer of NMΦunder tumor *** as proinflammatory cytokines,Zn^(2+)can trigger cell anoikis to expose tumor antigens,which are selectively captured by the BaSO_(4)***,the hierarchical nanostructure of NMΦs allows them to mediate immunogenic death of tumor cells and subsequent antigen capture for T cell activation to fabricate long-term antitumor *** a proof-of-concept,the NMΦmimics the biological functions of macrophage,including tumor residence,cytokine release,antigen capture and immune activation,which is hopeful to provide a paradigm for the design and biomedical applications of artificial cells.

关键词： Artificial macrophage Chemical messenger Hierarchical nanostructure Anoikis Antitumor immunotherap

Facile synthesis of Nitrogen/Sulfur Co-Doped Three-Dimensional Graphene Aerogels as Efficient Metal-Free Electrocatalyst for Oxygen Reduction Reaction

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Facile synthesis of Nitrogen/Sulfur Co-Doped Three-Dimension...

Effect of the porogens on the structure and adsorption for the polar-modified post-cross-linked resin

第九届全国环境催化与环境材料学术会议——助力两型社会快速发展的环境催化与环境材料

作者： Johnny Muya Chabu liu Deng you-nian liu College of Chemistry and Chemical Engineering Central South University Department of Chemistry Faculty of Science University of Lubumbashi

Three-dimensional(3D)sulfur and nitrogen substituted graphene aerogel(SNGAs)as efficient metal-free cathode catalysts for the oxygen reduction reaction(ORR)are *** dual doped graphene aerogel exhibit an interconnected macroporous framework of graphene sheets and tunable SN *** optimal material shows excellent catalytic activity including a highly positive onset potential,very high kinetic limiting current and four-electron transfer pathway with

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Effect of the porogens on the structure and adsorption for t...

Grinding sol gel synthesis and electrochemical performance of mesoporous Li_3V_2(PO_4)_3 cathode materials

第九届全国环境催化与环境材料学术会议——助力两型社会快速发展的环境催化与环境材料

作者： Xiaomei Wang Jianhan Huang you-nian liu Department of Bioengineering and Environmental Science Changsha University College of Chemistry and Chemical Engineering Central South University

The porogens used in the polymerization play important roles in the chemical structure, pore structure and adsorption performance for the polar-modified post-cross-linked resins. A series of novel polar-modified post-cross-linked resins were prepared using different mass percentage of toluene and 3-methyl-1-butanol as the mixed porogens(Scheme 1), and the results indicated that the resins using a higher mass percentage of toluene in the mixed porogens possessed a higher content of pendent vinyl groups, the greater Brunauer-Emmett-Teller(BET) surface area and t-plot micropore surface area. What’s more, the Friedel-Crafts alkylation reaction induced a higher increment of the BET surface area and t-plot micropore surface area. The resin using 50%(w/w) of toluene and 50%(w/w) of 3-methyl-1-butanol in the mixed porogens held the largest equilibrium capacity to phenol among the four considered resins. The equilibrium data was well characterized by the Freundlich model and the isosteric enthalpy decreased strongly with increasing of the fractional loading. The resin using a lower mass percentage of toluene in the mixed porogens required less time to reach equilibrium because of its less micropores and the minor diffusion resistance in the pores. p(GMA-co-DVB)-22-pc exhibited a dynamic saturated capacity of 55.4 mg/m L wet resin at an initial concentration of 1250 mg/L and a flow rate of 1.4 m L/min, and it could be completely regenerated by 0.001 mol/L of sodium hydroxide(w/v) and 80% of ethanol(v/v).

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Transactions of Nonferrous Metals Society of China 2013年第2期23卷 439-444页

作者：刘国聪刘又年刘素琴中南大学化学化工学院长沙410083 惠州学院化学工程系惠州516007

Li3V2（PO4）3 precursor was obtained with ***2O , LiOH＇H2O, NH4H2PO4 and sucrose as starting materials by grinding-sol-gel method, and then the monoclinic-typed Li3Vz（PO4）3 cathode material was prepared by sintering the amorphous Li3V2（PO4）3. The as-sintered samples were investigated by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, N2 adsorption-desorption and electrochemical measurement. It is found that Li3Vz（PO4）3 sintered at 700 ℃ possesses good wormhole-like mesoporous structure with the largest specific surface area of 188 cmZ/g, and the smallest pore size of 9.3 nm. Electrochemical test reveals that the initial discharge capacity of the 700 ℃ sintered sample is 155.9 mA.h/g at the rate of 0.2C, and the capacity retains 154 mA.h/g after 50 cycles, exhibiting a stable discharge capacity at room temperature.

关键词： Li3Vz(PO4)3 cathode material mesoporous structure grinding-sol-gel method electrochemical performance