作者： Liu, Li;Deng, Xiangyuan;Liao, Yun;Xiao, Detao;Wang, Meng*

期刊： Materials Letters,2021年285:129177 ISSN：0167-577X

通讯作者： Wang, Meng

作者机构： [Liu, Li; Xiao, Detao; Deng, Xiangyuan; Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, Meng] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

关键词： Adsorption;Microporosity;Radon;Adsorption capacities;Adsorption coefficients;Adsorption-desorption cycles;Hierarchical porous;Macropores;Meso-pores;Nano-attapulgite;Regeneration performance;Activated carbon

摘要： In order to improve the radon adsorption capacity of activated carbon (AC), one-dimensional nano attapulgite (AT) was filled into the macropores and mesopores of activated carbon, and sintered to prepare activated carbon/attapulgite (AC/AT) composites with more abundant micropores. The effect of AT on the structure and radon adsorption capacity of activated carbon was studied in detail. The results show that AT can easily diffuse into the macropores and mesopores of activated carbon to form a new hierarchical porous network, which significantly increases the specific surface area and proportion of micropores of activated carbon. The as-prepared AC/AT composites exhibit excellent radon adsorption and regeneration performance. With the filling content of AT ranging from 0 to 3%, the radon adsorption coefficient increases from 4.28 L/g to 5.35 L/g, and maintains 92.7% of its initial value after 5 adsorption-desorption cycles. © 2020 Elsevier B.V.

语种： 英文

作者： Liao, Yun;Liu, Li;Wang, Meng*;Li, Li-Xia*;Cao, Bing;...

期刊： Polymer Composites,2021年42(5):2293-2304 ISSN：0272-8397

通讯作者： Wang, Meng;Li, Li-Xia

作者机构： [Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang, Peoples R China.;[Liu, Li; Wang, Hai; Wang, Meng; Liao, Yun; Huang, Wei-Qiang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Cao, Bing; Li, Li-Xia] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China.

通讯机构： [Wang, Meng] U;[Li, Li-Xia] B;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China.

关键词： controlled‐release fertilizer;montmorillonite;polyurethane;starch

摘要： <jats:title>Abstract</jats:title><jats:p>In order to enhance the controlled‐release property of starch‐based polyurethane (SPU) coating, polyurethane/montmorillonite (SPU/MMT) composite coatings for controlled‐release urea were prepared by in‐situ polymerization with a rotating drum. The effect of MMT on morphology, structure, physico‐chemical properties, especially controlled‐release property of the as‐prepared composite coatings were studied in detail. The results showed that MMT particles dispersed well in SPU matrix, and the obtained SPU/MMT composite coatings possessed more tough and compact morphology with less‐visible holes compared with SPU coating. With the content of MMT rising to 3%, the time needed for 75% nitrogen release increased to 49 days, much longer than 14 days of SPU coating. Further, the nitrogen release mechanism underlying the structure and properties of SPU/MMT composite coatings were discussed and elucidated. According to the analysis, the superior controlled‐release property of SPU/MMT coatings originated from the impermeablity to water molecules of layered MMT acting as mechanical barriers to increase the diffusion path and resistance, the enhanced crosslinking density and hydrophobicity of composite system due to the introduction of MMT, as well as the improved mechanical properties hindering the formation of cracks and enlargement of the holes on the surface of composite coatings.</jats:p>

语种： 英文

作者： Wang, Mingyue;Huang, Liping;Zhang, Qian;Seidl, Marcus;Liu, Zijing;...

期刊： International Journal of Energy Research,2021年45(8):11807-11821 ISSN：0363-907X

通讯作者： Wang, Xiang

作者机构： [Huang, Liping; Wang, Mingyue; Wang, Xiang; Zhang, Qian] Harbin Engn Univ, Coll Nucl Sci & Technol, Harbin 150001, Heilongjiang, Peoples R China.;[Seidl, Marcus] Tech Univ Munich, Dept Nucl Engn, Garching, Germany.;[Liu, Zijing] Univ South China, Dept Nucl Sci & Technol, Hengyang, Peoples R China.

通讯机构： [Wang, Xiang] H;Harbin Engn Univ, Coll Nucl Sci & Technol, Harbin 150001, Heilongjiang, Peoples R China.

关键词： Assembly;Cladding (coating);Coolants;Cooling water;Neutron spectrometers;Nuclear fuels;Oxide minerals;Reactor cores;Sensitivity analysis;Thoria;Uranium dioxide;Water cooling systems;Cladding material;Fast neutron spectrums;Fuel compositions;Fundamental research;Physical characteristics;Power distributions;Pressurized water;System characteristics;Pressurized water reactors

摘要： The super-critical water-cooled reactor (SCWR) is one of six types of Gen-IV reactors. Based on the current mature pressurized water reactor technology, it has several advantages, including high conversion ratio, high breeding of nuclear fuel, high thermal efficiency, and a simplified system. However, due to the combination of water coolant and fast neutron spectrum, there is a need to address safety problems caused by the positive void coefficient. The purpose of this paper is to give a study on physical characteristics for the reactor core. Herein, the core modeling of an SCWR with a single-pass flow is that seed assemblies and blanket assemblies are arranged in a tornado manner, in which MCNP and SERPENT are used for critical calculation. The assembly design is discussed from the aspects of the thickness of the solid moderator layer and cladding material. Based on the optimized assembly design, UO2, PuO2-ThO2, and PuO2-UO2 are selected for the sensitivity analysis of fuel composition. In addition, sensitivity analysis for axial coolant density distribution, water-to-fuel volume ratio, reflector thickness and fuel arrangement are carried out. Several fundamental system characteristics are discussed in this paper, including keff, void coefficient, Doppler coefficient, neutron spectrum, power distribution, one-cycle burnup and conversion ratio. The results help in understanding the design of the SCWR better and provide fundamental research data for further study. © 2020 John Wiley & Sons Ltd

语种： 英文

作者： Liao, Yun;Cao, Bing;Liu, Li;Wu, Xiandong;Guo, Sheng;...

期刊： Journal of Applied Polymer Science,2021年138(15):50179- ISSN：0021-8995

通讯作者： Wang, Meng

作者机构： [Guo, Sheng; Mi, Changhui; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang, Peoples R China.;[Cao, Bing] Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resource, Beijing, Peoples R China.;[Li, Kaiwen; Liu, Li; Wang, Meng; Wu, Xiandong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, Meng] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

关键词： applications;biopolymers and renewable polymers;surfaces and interfaces;structure-property relationships;polyurethane

摘要： Two kinds of bio-based polyurethane coatings for controlled-release urea were prepared by in-situ polymerization used castor oil and liquefied starch as raw materials, respectively. Scanning electron microscopy (SEM) showed that the section morphology of castor oil based polyurethane (Castor-PU) coating was uniform and dense, and that of liquefied starch based polyurethane (Starch-PU) coating had certain proportion of microporous. Infrared spectroscopy (IR) showed that the two coatings had typical urethane characteristic structure, but the difference was that the Starch-PU had obvious unreacted isocyanate structure. Differential scanning calorimetry (DSC) showed that the glass transition temperature of the two coatings was around 58°C, but the Castor-PU had a crystallization domain with obvious crystallization melting peak at 130°C. Thermogravimetric analysis (TG) showed that the thermal stability of Castor-PU was significantly higher than that of Starch-PU. The controlled-release property test showed that when the coating ratio was 2.8%, the nutrient release longevity of urea coated with Castor-PU was 49 days and that of urea coated with Starch-PU was 14 days. The reasons for the poor controlled-release performance of Starch-PU were analyzed, which probably caused by concentrated sulfuric acid and hydrophilic dispersant added in the liquefied starch. © 2020 Wiley Periodicals LLC.

语种： 英文

作者： 曹兵;王孟;杨凯劲;倪小会;王学霞;...

期刊： 农业工程学报,2020年36(14):167-173 ISSN：1002-6819

通讯作者： Chen, Yanhua(yhchen55@126.com)

作者机构： [曹兵; 倪小会; 王学霞; 邹国元; 陈延华] Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forestry Science, Beijing;100097, China;Beijing Engineering Technology Research Center for Slow/Controlled-Release Fertilizer, Beijing;[王孟; 杨凯劲] School of Nuclear Science and Technology, Nanhua University, Hengyang;421001, China

通讯机构： Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forestry Science, Beijing, China

关键词： 肥料;吸水率;保水材料;保水缓释肥;释放期

摘要： 开发具有保水缓释双重功能的新型肥料,对于提高水肥利用效率和保障农业可持续发展具有重要意义。该研究探索了纳米二氧化硅(SiO_2)对提升保水材料吸水率及改善保水缓释肥性能的效果,采用丙烯酸(AA)和丙烯酰胺(AM)为原料,首先通过水溶液原位聚合法制备了P(AA-AM)/SiO_2复合保水材料,然后采用双层包膜工艺制备了保水缓释肥,在合成保水材料时,丙烯酸和丙烯酰胺的质量比为3.5∶1,引发剂(过硫酸钾和亚硫酸钠)、交联剂(N,N-亚甲基双丙烯酰胺)、增塑剂(丙三醇)和纳米SiO_2分别为单体质量的1%、0.04%、15%和2%。保水缓释肥采用转鼓包膜工艺制备,内包膜层为聚氨酯,占肥料核芯的3%,外包膜层为P(AA-AM)/SiO_2复合保水材料,占肥料核芯的24%。保水材料的形貌结构和热稳定性用傅里叶红外光谱(Fourier transform infrared spectroscopy,FTIR)、扫描电镜(Scanning electron microscopy,SEM)和热重(Thermogravimetry,TG)表征,保水材料的吸水率用过滤法测定;采用土壤培养研究保水缓释肥的保水和持水性能,保水缓释肥的缓释性能用水浸泡法研究。结果发现:纳米SiO_2能较好地分散于基体P(AA-AM)保水材料中,与P(AA-AM)保水材料相比,添加纳米SiO_2的复合保水材料在去离子水和0.9% NaCl水溶液中的吸水率分别提高152%和87%,而且热稳定性显著提高;SEM和FTIR结果表明,纳米SiO_2能较好地分散于P(AA-AM)保水材料中,SiO_2表面含有的硅羟基增加了保水材料的交联密度。相比没有保水层的缓释肥,复合保水缓释肥的土壤持水率和保水率(培养25 d后)分别提高了25.5%和47.2%,肥料释放期由60 d增加到72 d。综上所述,纳米SiO_2显著提高了保水材料的吸水率,以此制备的复合保水缓释肥具有优异的保水和缓释能力,该研究为研发高效肥料、提高水肥利用效率提供了新思路。

语种： 中文

作者： 刘敏;夏艳芳;丁晓彤;胡盛礼;彭安国;...

期刊： 广东化工,2020年47(03):222+252 ISSN：1007-1865

作者机构： 南华大学核科学技术学院,湖南衡阳421001;[彭安国; 夏艳芳; 王孟; 丁晓彤; 胡盛礼; 刘敏] 南华大学

关键词： 开放性实验;创新

摘要： XRD是一种应用广泛的分析晶体结构的方法。将XRD用于开放性实验教学,对模式的建立、实施和可行性进行分析,与时俱进,培养创新型人才。实验过程中可提高老师的综合素质,增加学生对X射线衍射仪学习和使用的机会,培养学生的综合能力,养成良好的科研习惯,满足时代需求。

语种： 中文

作者： Wang, Mengdie;Zhang, Jian;Sun, Yunkai*;Wei, Jing*;Tan, Chunhong;...

期刊： CrystEngComm,2020年22(23):3965-3974 ISSN：1466-8033

通讯作者： Sun, Yunkai;Wang, Xiao-Feng;Wei, Jing

作者机构： [Wang, Mengdie; Sun, Yunkai; Wang, Xiao-Feng; Zhang, Jian; Tan, Chunhong] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Sun, Yunkai; Wang, Xiao-Feng] Univ South China, Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Peoples R China.;[Wei, Jing] Chinese Acad Sci, Fujian Inst Res Struct Matter, Fuzhou 350002, Peoples R China.

通讯机构： [Sun, YK; Wang, XF] U;[Wei, Jing] C;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;Univ South China, Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Peoples R China.;Chinese Acad Sci, Fujian Inst Res Struct Matter, Fuzhou 350002, Peoples R China.

摘要： Four layered coordination polymers, namely, [Cd2(fuma)2(phen)2] (1), [Cd2(BDC)2(phen)2]·2DMF (2), [Cd2(NDC)2(phen)2]·0.5H2O (3), and [Cd2(NDC)2(bipy)2]·2DMF (4) have been synthesized under solvo-thermal conditions (fuma = fumaric acid, H2BDC = 1,4-benzenedicarboxylic acid, H2NDC = 1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine), which are composed of asymmetric/symmetric binuclear Cd2(RCOO)4(phen)2or Cd2(RCOO)4(bipy)2clusters as secondary building units (SBUs) linked by fuma2−, BDC2−, and NDC2−. Owing to the different steric hindrances of the di-carboxylates, the variation in Cd2(RCOO)4(phen)2SBUs showed an intriguing structural modulation, which was due to the carboxylates adopting dissimilar coordination fashions, while both the terminal phen co-ligands changed fromcis- totrans-position. Thus, this further induced twist angles (three neighbouring SBUs connected by the di-carboxylic acid) in the single layer of1-3varying from 109.7°, 132.3° to 180° (viewed along thea-axis) and correspondingly, three Cd2-SBU-based CPs exhibited structural evolution from an undulating to a lamellar layer. When the co-ligand bipy replaced phen,4also formed a lamellar layer framework based on the paddle-wheel Cd2(RCOO)4(bipy)2SBUs with bipy perpendicular to the layer rather than the slanted phen in3. The luminescence properties of1-4have also been explored, and their fluorescence emission mechanism of ligand-to-ligand charge transfer (LLCT) are confirmed by the time-dependent density functional theory (TDDFT) calculations. © The Royal Society of Chemistry 2020.

语种： 英文

作者： Liao, Yun;Wang, Meng;Chen, Dajun*

期刊： Applied Surface Science,2019年484:83-96 ISSN：0169-4332

通讯作者： Chen, Dajun

作者机构： [Liao, Yun; Chen, Dajun] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 Renmin Rd N, Shanghai 201620, Peoples R China.;[Wang, Meng; Liao, Yun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Chen, Dajun] D;Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 Renmin Rd N, Shanghai 201620, Peoples R China.

关键词： Electrosorption;Graphene;Phosphate-functionalized;Uranium(VI)

摘要： In the present work, we reported the preparation of a highly porous phosphate-functionalized graphene (HGP) hydrogel electrode material by a two-step process for uranium (U(VI)) electrosorption. The extra pores were pre-created on graphene nanosheets by a simple H 2 O 2 etching reaction, and then the as-formed holy graphene nanosheets (HG) were assembled into a 3D macrostructure using phytic acid as both gelator and modifier. The interconnected 3D network structure with the hierarchical pores, as well as the abundant phosphate groups, endowed the HGP hydrogel with superior wettability and electrochemical properties compared to pristine graphene. From the results of electrosorption experiments towards U(VI), the kinetics equilibrium of HGP electrode could be reached within 21 min, and its maximum adsorption capacity was up to 545.7 mg g −1 at 1.2 V and pH 5.0. Furthermore, the HGP electrode showed high selectivity towards U(VI) in the presence of other competitive metal ions. Meanwhile, it also exhibited the feasibility of regeneration with an acceptable reduce of 7.5% in removal ratio after six cycles. © 2019 Elsevier B.V.

语种： 英文

作者： 王孟;王清良;邓话;黄永春;于涛

期刊： 核化学与放射化学,2019年41(3):260-263 ISSN：0253-9950

作者机构： [于涛] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[邓话; 黄永春] China National Nuclear Corporation Jianzhong Nuclear Fuel Co. Ltd., Yibin, 644000, China;[王清良] School of Nuclear Resource Engineering, University of South China, Hengyang, 421001, China;[王孟] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China<&wdkj&>China National Nuclear Corporation Jianzhong Nuclear Fuel Co. Ltd., Yibin, 644000, China

关键词： 含铀灰渣;浸出;工艺技术;超声

摘要： 在铀产品及核燃料元件制造过程中,各种可燃性废物经裂解焚烧减容处理而产生大量含铀灰渣。通过对含铀灰渣进行多级逆流浸出,考察灰渣预处理方式、灰渣粒度、浸出级数以及超声作用对溶解浸出效率的影响,结果表明:(1)含铀灰渣的预处理方式对溶解浸出过程有明显的影响,120 ℃烘干预处理灰渣比800 ℃煅烧预处理灰渣更易于浸出;(2)灰渣粒度对浸出过程无明显影响;(3)含铀灰渣经一级浸出后,铀质量分数从20%左右降至1.5%以下,二级浸出渣铀质量分数降至0.8%左右,三级浸出灰渣铀质量分数变化不大;(4)超声能明显强化含铀灰渣的溶解浸出过程,使一级浸出渣铀质量分数从1.26%降至0.34%,超声强化二级浸出渣铀质量分数可降至0.12%。

语种： 中文

作者： Wu Hongmei*;Li Huiting;Li Yongcheng;Wang Hongqing;Wang Meng

期刊： 高等学校化学学报,2019年40(1):180-186 ISSN：0251-0790

通讯作者： Wu Hongmei

作者机构： [Wu Hongmei; Wang Meng; Li Huiting; Li Yongcheng; Wang Hongqing] Univ South China, Coll Chem & Chem Engn, Dept Polymer Sci & Engn, Hengyang 421001, Peoples R China.

通讯机构： [Wu Hongmei] U;Univ South China, Coll Chem & Chem Engn, Dept Polymer Sci & Engn, Hengyang 421001, Peoples R China.

关键词： 基团贡献法;分子动力学模拟;玻璃化转变温度;聚间苯二甲酰对苯二胺

摘要： 采用基团贡献法(GC)和分子动力学法(MD)模拟了聚间苯二甲酰间苯二胺纤维(MPDI)和聚对苯二甲酰对苯二胺(PPTA)的玻璃化转变温度,并与实验值进行了对比.结果表明,使用基团贡献法和分子动力学法测得的MPDI和PPTA的玻璃化转变温度与实验值接近,说明基团贡献法和分子动力学法可以用来预测芳香族聚酰胺的玻璃化转变温度.在此基础上,采用GC和MD预测了聚间苯二甲酰对苯二胺(PPIA)的玻璃化转变温度.在MD模拟中,对密度、比体积、回转半径和非键相互作用随温度的变化规律进行了分析.结果表明,自由体积理论能较好地解释PPIA的玻璃化转变现象,其中非键相互作用随温度的变化是玻璃化转变的本质原因.PPIA的玻璃化转变温度介于MPDI和PPTA之间,有望成为综合性能介于两者之间的另一种高性能聚酰胺.

语种： 中文

作者： 伍贤东;王孟;钱嘉帆;杨绍丁;刘力;...

期刊： 植物营养与肥料学报,2019年25(12):2053-2060 ISSN：1008-505X

作者机构： [伍贤东; 王孟; 刘力; 肖静水] School of Nuclear Science and Technology, University of South China, Hengyang, Hunan, 421001, China;[钱嘉帆; 杨绍丁; 廖云] School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China

关键词： 聚氨酯;蒙脱土;复合材料;制备;性能;控释肥

摘要： [目的]蒙脱土(MMT)是一种由纳米硅酸盐片层堆积的粘土矿物,具有优良的力学、热学及气体阻隔性能.本研究尝试了不同离子交换剂,以使其能在聚氨酯(PU)基体中充分剥层分散,制成力学性能与控释性能优良的复合控释肥膜材.[方法]试验选用3种有机离子交换剂十八烷基三甲基氯化铵(SA1)、十二烷基双羟乙基甲基氯化铵(SA2)、二甲基双十八烷基氯化铵(SA3)对MMT进行插层改性,然后通过原位聚合制备蓖麻油基聚氨酯/蒙脱土(PU/MMT)复合缓释肥膜材.纳米粒子及复合膜材的形态与结构用电镜扫描、傅里叶红外光谱、X射线衍射等方法进行了表征.采用吸水法和浸泡法测试了PU/MMT复合膜材的动态力学性能和热稳定性能及缓释性能.[结果]3种有机插层改性的MMT纳米粒子在PU基质中具有良好的分散性和相容性,纳米粒子的加入也明显改进了PU基质的动态力学性能、热稳定性能以及缓释性能,其中SA2改性MMT对复合膜材的动态力学性能和热稳定性影响最为明显,使基质PU的玻璃化转变温度(Tg)从30℃ 增加到80℃,热分解温度从300℃增加到330℃,因为SA2结构中的双羟乙基能使MMT与PU结合更加紧密;而SA3改性MMT制备的复合膜材缓释性能最佳,使尿素释放时间从30天增加到75天,因为SA3含有双长链有机结构.[结论]采用十二烷基双羟乙基甲基氯化铵或者二甲基双十八烷基氯化铵对MMT进行插层改性,可制备结构疏松、在聚合物中分散性良好的纳米粒子.添加改性蒙脱石纳米粒子可大大提高聚合物包膜材料的吸水性和稳定性,从而制备出阻隔性能优良、释放期理想且价廉质高的PU/MMT复合控释肥膜材.

语种： 中文

作者： Wu, Xiandong;Li, Kaiwen;Ying, Sujunheng;Liu, Li;Wang, Meng*;...

期刊： Journal of Radioanalytical and Nuclear Chemistry,2019年321(3):977-984 ISSN：0236-5731

通讯作者： Wang, Meng;Liao, Yun

作者机构： [Li, Kaiwen; Liu, Li; Wang, Meng; Ying, Sujunheng; Liao, Yun; Wu, Xiandong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, M; Liao, Y] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

关键词： graphene;uranium dioxide;adsorption;Article;chemical phenomena;chemical structure;controlled study;electrochemistry;electrosorption;infrared spectroscopy;material state;scanning electron microscopy;surface area;X ray diffraction

摘要： In this paper, three-dimensional graphene (3DG) electrode material was prepared by hydrothermal reduction using graphene oxide as precursor. Its morphology and structure were characterized by SEM, BET, XRD, Raman, FTIR and TG, and its electrochemical performance was also measured. The results showed that 3DG possessed hierarchical pore structure, large specific surface area, high specific capacitance and low impedance. Using 3DG as electrode material for electrosorption of UO2 2+, it showed that the saturated adsorption capacity can reach up to 113.80mgg−1 and the adsorption rate is 0.32mgg−1min−1 at a given optimal applied voltage of 1.8V. © 2019, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： Weng, Zhe;Wu, Yueshen;Wang, Maoyu;Jiang, Jianbing;Yang, Ke;...

期刊： Nature Communications,2018年9(1):415 ISSN：2041-1723

通讯作者： Liang, Yongye;Wang, Hailiang;Feng, Zhenxing

作者机构： [Liang, Yongye; Weng, Zhe] South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;[Wang, Hailiang; Jiang, Jianbing; Brudvig, Gary W.; Huo, Shengjuan; Yang, Ke; Batista, Victor S.; Weng, Zhe; Wu, Yueshen] Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA.;[Wang, Hailiang; Jiang, Jianbing; Brudvig, Gary W.; Huo, Shengjuan; Yang, Ke; Batista, Victor S.; Weng, Zhe; Wu, Yueshen] Yale Univ, Energy Sci Inst, West Haven, CT 06516 USA.;[Feng, Zhenxing; Wang, Maoyu] Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA.;[Huo, Shengjuan] Shanghai Univ, Sci Coll, Dept Chem, Shanghai 200444, Peoples R China.

通讯机构： [Liang, Yongye] S;[Wang, Hailiang] Y;[Feng, Zhenxing] O;South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA.

摘要： Restructuring-induced catalytic activity is an intriguing phenomenon of fundamental importance to rational design of high-performance catalyst materials. We study three copper-complex materials for electrocatalytic carbon dioxide reduction. Among them, the copper(II) phthalocyanine exhibits by far the highest activity for yielding methane with a Faradaic efficiency of 66% and a partial current density of 13 mA cm−2 at the potential of – 1.06 V versusthe reversible hydrogen electrode. Utilizing in-situ and operando X-ray absorption spectroscopy, we find that under the working conditions copper(II) phthalocyanine undergoes reversible structural and oxidation state changes to form ~ 2 nm metallic copper clusters, which catalyzes the carbon dioxide-to-methane conversion. Density functional calculations rationalize the restructuring behavior and attribute the reversibility to the strong divalent metal ion–ligand coordination in the copper(II) phthalocyanine molecular structure and the small size of the generated copper clusters under the reaction conditions. The catalytic conversion of carbon dioxide into value-added products requires an understanding of the active species present under working conditions. Here, the authors discover copper-containing complexes to reversibly transform during electrocatalysis into methane-producing copper nanoclusters.

语种： 英文

作者： Wang, M.*;Shan, D. C.;Liao, Y.

期刊： IOP Conference Series: Materials Science and Engineering,2018年283:012010 ISSN：1757-8981

通讯作者： Wang, M.

作者机构： [Wang, M.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Shan, D. C.; Liao, Y.] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, M.] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

会议名称： 6th Global Conference on Materials Science and Engineering (CMSE)

会议时间： OCT 24-27, 2017

会议地点： Beijing, PEOPLES R CHINA

会议主办单位： [Wang, M.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.^[Shan, D. C.;Liao, Y.] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

会议论文集名称： IOP Conference Series-Materials Science and Engineering

摘要： In this paper, several mechanical responses of thermoplastic polyurethane (TPU) filled with nano-scale attapulgite (AT) particles, including cyclic loading-unloading behavior, dynamic mechanical behavior and stress relaxation have been investigated. With the addition of AT, it is noticed that the strength, modulus and stress relaxation time of TPU increased significantly compared to that of unfilled materials. It is also observed that, whether filled or unfilled TPU, pronounced inelastic mechanical features such as Mullins effect, residual strain and hysteresis, occurred mainly during the first load loop, but became more notable with AT increase.

语种： 英文

作者： 吴红枚;梁振辉;丁勇;王榆元;单德才;...

期刊： 塑料工业,2018年46(7):18-21 ISSN：1005-5770

作者机构： [吴红枚; 梁振辉; 丁勇; 王榆元; 单德才; 王孟] 南华大学化学化工学院高分子材料与工程系, 湖南, 衡阳, 421001

关键词： 聚间苯二甲酰对苯二胺;界面缩聚;比浓对数黏度;合成

摘要： 采用界面缩聚法合成了聚间苯二甲酰对苯二胺(PPIA),研究了各反应条件对聚合物比浓对数黏度的影响,并通过红外、热重分析使聚合物的结构与热性能进行了表征和分析,同时对聚合物进行了溶解性实验。结果表明,聚合反应的温度对聚合物比浓对数黏度存在峰值,较佳的反应温度为15 ℃ ,提高搅拌速率有利于获得高黏度的产物,缚酸剂2-甲基吡啶的用量与单体对苯二胺用量的物质的量比应略超过2 : 1为佳,单体物质的量比的变化对聚合物的比浓对数黏度影响较小。当温度高于200 ℃时,PPIA才开始分解,在586 ℃时热失重率为48%,PPIA有望成为一种耐高温纤维。聚合物在常见的极性溶剂中溶解性较差,当极性溶剂中溶有无机盐时,增强了PPIA的溶解性。

语种： 中文

作者： Liao, Yun;Wang, Meng;Chen, Dajun*

期刊： Industrial & Engineering Chemistry Research,2018年57(25):8472-8483 ISSN：0888-5885

通讯作者： Chen, Dajun

作者机构： [Liao, Yun; Chen, Dajun] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.;[Wang, Meng; Liao, Yun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Chen, Dajun] D;Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.

摘要： The relatively low density of functional groups of graphene oxide (GO) and the difficulty to completely recover after adsorption limit its application in uranium (U(VI)) removal from aqueous solution. Inspired by a special chemical property, polydopamine (PDA) was first used as a surface modifying agent for GO, and then the as-formed GO@PDA cross-linked with chitosan (CS) to assemble a three-dimensional (3D) porous GO@PDA/CS aerogel for U(VI) adsorption. Morphology and structure of the aerogel were characterized by TEM, SEM, FTIR, XPS, XRD, Raman, and TGA. The results show that compared to GO/CS, the GO@PDA/CS aerogel possesses a more homogeneous and well-organized 3D porous structure as well as the enhanced active sites, which are beneficial for U(VI) removal. According to batch experiments, the adsorption rate of the GO@PDA/CS aerogel was very fast, and the adsorption equilibrium could be reached in 15 min at pH = 6.0. Its maximum adsorption capacity for U(VI) is as high as 415.9 mg g-1 at 298 K calculated from the Langmuir model. In addition, the as-prepared GO@PDA/CS aerogel exhibits satisfactory thermal and mechanical stability and could be recycled six times without an apparent decrease in removal efficiency. © Copyright 2018 American Chemical Society.

语种： 英文

作者： Liao, Yun;Wang, Meng;Chen, Dajun*

期刊： Journal of Radioanalytical and Nuclear Chemistry,2018年316(2):635-647 ISSN：0236-5731

通讯作者： Chen, Dajun

作者机构： [Liao, Yun; Chen, Dajun] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 Renmin Rd N, Shanghai 201620, Peoples R China.;[Wang, Meng; Liao, Yun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Chen, Dajun] D;Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 Renmin Rd N, Shanghai 201620, Peoples R China.

关键词： adsorbent;porous polydopamine functionalized attapulgite chitosan aerogel;unclassified drug;uranium;adsorption;Article;chemical structure;desorption;energy dispersive X ray spectroscopy;infrared spectroscopy;isotherm;molecular weight;pH;physical chemistry;Raman spectrometry;scanning electron microscopy;thermodynamics;transmission electron microscopy;X ray diffraction;X ray photoelectron spectroscopy

摘要： A novel three-dimensional porous polydopamine-functionalized attapulgite/chitosan (AT@PDA/CS) aerogel was designed and prepared for uranium(VI) adsorption, and its morphology and structure were characterized by TEM, SEM-EDS, XRD, FT-IR, Raman and XPS techniques. According to batch experiments, its adsorption equilibrium was reached within 40min at pH 5.0. The adsorption isotherms was fitted well for Langmuir isotherm model and maximum adsorption capacity was 175.1mgg−1 at 328K. The thermodynamic analysis indicated that the adsorption was an endothermic and spontaneous process. Furthermore, the aerogel has superior absorption reusability and the removal efficiency was maintained at 78% after five adsorption–desorption cycles. © 2018, Akadémiai Kiadó, Budapest, Hungary.

语种： 英文

作者： 王孟;单德才;廖云;刘芝芳

期刊： 高分子材料科学与工程,2018年34(1):50-53 ISSN：1000-7555

通讯作者： Wang, Meng(wmeng020321@163.com)

作者机构： [王孟] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[Shan, Decai; 廖云; 刘芝芳] School of Chemistry and Chemical Engineering, University of South China, Hengyang;[王孟; Shan, Decai; 廖云; 刘芝芳] 421001, China

通讯机构： [Wang, M.] S;School of Nuclear Science and Technology, China

关键词： 红外热成像仪;超高分子量聚乙烯;均匀塑性形变;热行为

摘要： 采用红外热成像仪同步跟踪超高分子量聚乙烯（UHMWPE）均匀塑性形变过程,可观察到几种特殊的热行为特征:（1）在初始弹性阶段样条有明显温度下降;（2）接着的塑性形变阶段温度逐渐升高;（3）在塑性大形变时,温升只与拉伸比有关,与拉伸速率无关。热行为特征能反映形变分子聚集结构的变化,分析结果表明,UHMWPE起始拉伸温度降低与材料正的热膨胀系数有关,而大形变时的温升则主要是由强迫高弹形变引起的构象熵热所致。

语种： 中文

作者： Wang, Meng*;Shan, Decai;Liao, Yun;Xia, Liangshu

期刊： Polymer Bulletin,2018年75(2):561-568 ISSN：0170-0839

通讯作者： Wang, Meng

作者机构： [Wang, Meng; Xia, Liangshu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Shan, Decai; Liao, Yun] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, Meng] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

关键词： Inelastic response;Polyurethane;Elastomeric composite;Loading-unloading cycle

摘要： The inelastic responses of thermoplastic polyurethane/attapulgite (AT) elastomeric composites were studied by an elastic-testing machine combining with an infrared camera during loading–unloading cycles, in which the former detected the mechanical properties while the latter reflected the thermal effects of deformation. For both unfilled and filled polyurethanes, some significant inelastic features were noticed that in the first cycle hysteresis and most stress softening occurred, and the corresponding temperature variation was partly reversible. However, in the following cycles, the specimen approached a steady state, therefore, stress–strain curve and the corresponding temperature variation was totally reversible. It was also showed that in filled materials the inelastic effects were becoming more obvious with the increase of AT concentration. The results can be explained by chain slippage of the hard micro-domain existing in soft segments of polyurethane, which produces irreversible friction dissipation during the initial loading process. © 2017, Springer-Verlag Berlin Heidelberg.

语种： 英文

作者： Xiao, Weiwei*;Li, Li;Wang, Meng

期刊： APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2017年123(6):1-9 ISSN：0947-8396

通讯作者： Xiao, Weiwei

作者机构： [Xiao, Weiwei] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;[Li, Li] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol, Sch Mech Sci & Engn, Wuhan 430074, Hubei, Peoples R China.;[Wang, Meng] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Xiao, Weiwei] U;Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Phase Velocity;Graphene Sheet;Nonlocal Parameter;Strain Gradient Theory;Nonlocal Elasticity Theory

摘要： The behaviors of monolayer graphene sheet have attracted increasing attention of many scientists and researchers. In this study, the propagation behaviors of in-plane wave in viscoelastic monolayer graphene are investigated. The constitutive equation and governing equation for in-plane wave propagation is developed by employing Hamilton’s principle and nonlocal strain gradient theory. By solving the governing equation of motion, the closed-form dispersion relation between phase velocity and wave number is derived and an asymptotic phase velocity can be acquired. The effects of wave number, material length scale parameter, nonlocal parameter and damping coefficient on in-plane wave propagation behaviors are discussed in the numerical studies. It is found that, when exciting wavelengths or structural dimensions become comparable to the material length scale parameters and nonlocal parameters, the scaling effects on wave propagation behaviors are significant. For nanoscaled graphene sheet, the effects of nonlocal parameter, material length scale parameter and damping coefficient on phase velocity are tiny at low wave numbers while significant at high wave numbers. The phase velocity would increase with the increase of material length scale parameter or the decrease of nonlocal parameter and damping coefficient. Furthermore, results indicate that the asymptotic phase velocity can be increase by increasing material length scale parameter or decreasing nonlocal parameter. © 2017, Springer-Verlag Berlin Heidelberg.

语种： 英文