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Preparation and properties of a new porous ceramic material used in clean energy field
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作者 Shuming Wang Xiaofang Zhang +6 位作者 Fenghua Kuang Jiangshan Li Yanxin Wang Ruiping Wang Yanru Wang Xin Lin Jianming Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第7期1255-1260,共6页
At high tem perature, the oxide redox reactions of ceria can split H2O and CO2 to produce H2 and CO, so porous ceria with high temperature resistance and high specific surface area has an important foreground in clean... At high tem perature, the oxide redox reactions of ceria can split H2O and CO2 to produce H2 and CO, so porous ceria with high temperature resistance and high specific surface area has an important foreground in clean energy applications. In this work, a reticulated porous ceria ceramic material with interconnected porous structure was prepared by the impregnation technique using organic polyurethane sponges as template. The influences of pretreated sponge, dipping time length, pore size and sintering temperature on the porosity and strength of the porous ceria ceramics were system atically studied. With the increasing sintering temperature, the glass phase occurred and led to an increase in strength, but an decrease in porosity. Eventually, we analyzed the relationships betw een porosity and strength of these porous materials, aiming to provide theoretical and practical references for its application in clean-energy field. 展开更多
关键词 POROUS CERAMICS POROUS CERIA IMPREGNATION Clean-energy
Impregnated Sulfur in Carbonized Nitrogen-containing Porous Organic Frameworks as Cathode with High Rate Performance and Long Cycle Life for Lithium-sulfur Batteries
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作者 DONG Yan BEN Teng 《高等学校化学研究:英文版》 SCIE CAS CSCD 2019年第4期654-661,共8页
The undesirable cycling performance caused by soluble poly sulfides shuttling between anode and cathode has been considered as the main challenge that has hindered its practical applications for lithium-sulfiir(Li-S) ... The undesirable cycling performance caused by soluble poly sulfides shuttling between anode and cathode has been considered as the main challenge that has hindered its practical applications for lithium-sulfiir(Li-S) batteries. To solve tliis issue effectively, a nitrogen-containing porous carbon, namely JUC-Z2-900,developed from a porous organic framework, namely JUC-Z2, bearing a high surface area(805 m^2/g),small pore size(0.5 mil) and nitrogen doping(2.15%, mass fraction), has been used as a host material for Li-S batteries. The micropores of JUC-Z2-900 can confine the smaller sulfur molecules S2-4, which can essentially alleviate the critical problem of poly sulfide dissolution.Furthermore, nitrogen-containing JUC-Z2-900 can promote chemical adsorption of sulfur. The above two factors can improve the electrochemical performance of Li-S batteries effectively. To compare the eftects of sulfur contents and melt-difiusion strategy in JUC-Z2-900/S composites, a series of JUC-Z2-900/S composites was synthesized and tlieir electrochemical perfbnnances were explored, indicating good rate performance and excellent cycling stability of the composites contributed by both appropriate mass percentage of sulfiir and its confinement in the micropores. 展开更多
关键词 Li-S battery Nitrogen-containing POROUS carbon POROUS organic framework
Laser additive manufacturing of Zn porous scaffolds;Shielding gas flow, surface quality and densification
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作者 Peng Wen Yu Qin +4 位作者 Yanzhe Chen Maximilian Voshage Lucas Jauer Reinhart Poprawe Johannes Henrich Schleifenbaum 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第2期368-376,共9页
Zn based metals have exhibited promising prospects as a structural material for biodegradable applications. Pure Zn porous scaffolds were produced by laser powder bed fusion(LPBF) based on data files of designing and ... Zn based metals have exhibited promising prospects as a structural material for biodegradable applications. Pure Zn porous scaffolds were produced by laser powder bed fusion(LPBF) based on data files of designing and CT scanning. Massive Zn evaporation during laser melting largely influenced the formation quality during LPBF of Zn metal. The metal vapor in processing chamber was blown off and suctioned out efficiently by an optimized gas circulation system. Numerical analysis was used to design and testify the performance of gas flow. The surface of scaffolds was covered with numerous particles in different sizes. Processing pores occurred near the outline contour of struts. The average grain size in width was8.5m, and the hardness was 43.8 HV. Chemical plus electrochemical polishing obtained uniform and smooth surface without processing pores, but the diameter of struts reduced to 250 αm from the design value 300 m. The poor surface quality and processing pores were resulted by the splashing particles included spatters and powders due to the recoil force of evaporation, and the horizontal movement of liquid metal due to overheating and wetting. The insufficient melting at the outline contour combined with good wetting of Zn liquid metal further increased the surface roughness and processing pores. 展开更多
关键词 ADDITIVE manufacturing Powder bed fusion LASER Porous SCAFFOLD ZN
166 dtex/288 f+44 dtex涤氨空包纱一步法生产工艺
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作者 张国平 沈建峰 +3 位作者 费东龙 王海英 费建丰 张小磊 《合成纤维》 CAS 2019年第7期15-16,52共3页
探讨了采用一体机一步法生产多孔166 dtex/288 f+44 dtex涤氨空包纱的主要工艺。结果表明:在一体机上生产时,涤纶的拉伸比选择1.62,上热箱温度控制在185℃,D/Y为1.70,氨纶的牵伸比为3.5,网络喷嘴采用1.6 mm带涡流腔椭圆孔,网络压力控制... 探讨了采用一体机一步法生产多孔166 dtex/288 f+44 dtex涤氨空包纱的主要工艺。结果表明:在一体机上生产时,涤纶的拉伸比选择1.62,上热箱温度控制在185℃,D/Y为1.70,氨纶的牵伸比为3.5,网络喷嘴采用1.6 mm带涡流腔椭圆孔,网络压力控制在0.3 MPa,机台速度为680 m/mim,可使多孔166 dtex/288 f+44 dtex涤氨空包纱生产过程稳定,产品品质可控,性能指标满足客户需求。 展开更多
关键词 涤氨空包纱 一步法 多孔 生产工艺
Adsorption of single and mixed haloacetonitriles on silica-based porous materials: Mechanisms and effects of porous structures
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作者 Panida Prarat Chawalit Ngamcharussrivichai +1 位作者 Sutha Khaodhiar Patiparn Punyapalakul 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第5期346-360,共15页
Adsorption mechanisms and the role of different porous and crystalline structures on the removal of five haloacetonitriles(HANs) over hexagonal mesoporous silica(HMS), titanium substituted mesoporous silica(Ti-HMS), r... Adsorption mechanisms and the role of different porous and crystalline structures on the removal of five haloacetonitriles(HANs) over hexagonal mesoporous silica(HMS), titanium substituted mesoporous silica(Ti-HMS), rod-shaped SBA-15 and microporous zeolite Na Y were investigated. In addition, the effect of p H on adsorption mechanism and selective adsorption of five HANs individually and in an equimolar mixed solution were evaluated.The results indicated that the intraparticle diffusion rate constants of the mesoporous adsorbents were higher than that of the microporous Na Y. In single solute, the order of adsorption preference(highest to lowest) was mono-HANs > di-HANs > tri-HAN. However,in mixed solute, the large molecular weight of the tri-HAN and di-HANs are more easily adsorbed than the smaller molecular weight mono-HANs. Except for SBA-15, the order of adsorption capacities in mixed HANs solute was not different compared to that observed for the single HAN solute, which might be caused by the higher accessibility to the active sites due to larger pore size. The ion-dipole electrostatic interaction was likely to be the main adsorption mechanism, and was favored at high p H values due to the high negative surface charge density of the adsorbent. The molecular structure of the HANs and hydrophilic/hydrophobic nature affected the adsorption capacities and their selective adsorption from mixed solutes. 展开更多
关键词 Haloacetonitrile ADSORPTION mechanism POROUS structure Ion-dipole ELECTROSTATIC interaction HYDROPHILICITY
Numerical Analysis on Thermal Function of Clothing with PCM Microcapsules 预览
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作者 LIU Wenyi LI Fengzhi LIU Weihua 《南京航空航天大学学报:英文版》 EI CSCD 2019年第2期320-329,共10页
To study the influences of phase change material(PCM)microcapsules in clothing on human thermal responses,a mathematical model is developed.The improved Stolwijk’s model is used to simulate human thermo-regulatory pr... To study the influences of phase change material(PCM)microcapsules in clothing on human thermal responses,a mathematical model is developed.The improved Stolwijk’s model is used to simulate human thermo-regulatory process,and the coupled heat and moisture transfer including the moisture sorption/desorption of fibers and effects of phase transition temperature range on the phase change processes of the PCM is considered in clothing model.Meanwhile,the theoretical predictions are validated by experimental data.Then,the interactions between human body thermal responses and the heat and moisture transfer in clothing are discussed by comparing the prediction results with PCMs and without PCMs.Also the effects of fiber hygroscopicity on clothing and human thermal responses are compared.The conclusion shows that the clothing with PCMs microcapsules can delay the human temperature variations and decrease the sweat accumulation rate on the skin surface and heat loss during changing of ambient conditions,and fiber hygroscopicity reduces the effect of PCM microcapsules on delaying garment temperature variations very significantly. 展开更多
关键词 PCM MICROCAPSULE porous textiles heat and MOISTURE transfer numerical simulation human thermoregulatory model
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Relationship on the Head Deviation Rate and LayingLength of Porous Tubes 预览
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作者 Yameng Wang Huanfang Liu 《哈尔滨工业大学学报:英文版》 EI CAS 2019年第5期88-96,共9页
To improve the utilization efficiency of water the laying length of porous tubes was analyzed. Considering long porous tubes the irrigation uniformity of porous tubes was studied by analyzing the deviation rate of the... To improve the utilization efficiency of water the laying length of porous tubes was analyzed. Considering long porous tubes the irrigation uniformity of porous tubes was studied by analyzing the deviation rate of the working head of porous tubes and through an impact analysis of the deviation ratio of flow rate based on laying length slope pressure head and perforation spacing. Results showed that the deviation ratio of the flow rate could be reduced by decreasing the length of tubes and increasing the slope. The deviation ratio of flow rate was less influenced by pressure head and perforation spacing. A best laid slope resulted in a longer laying length of the porous tubes and they were not constant. 展开更多
关键词 flow deviation RATE POROUS TUBES deviation RATE of working HEAD LAYING length HEAD LOSS
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单孔与多孔腹腔镜在卵巢囊肿剔除术中的疗效比较 预览
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作者 熊敏 《医药前沿》 2019年第21期28-29,共2页
目的:在腹腔镜卵巢囊肿剔除术分别应用单孔腹腔镜与多孔腹腔镜,观察比较疗效.方法:48例接受腹腔镜卵巢囊肿剔除术治疗的卵巢囊患者均为本院2016年1月-2019年1月收治.其中24例接受单孔腹腔镜治疗(单孔组),24例接受多孔腹腔镜(多孔组).结... 目的:在腹腔镜卵巢囊肿剔除术分别应用单孔腹腔镜与多孔腹腔镜,观察比较疗效.方法:48例接受腹腔镜卵巢囊肿剔除术治疗的卵巢囊患者均为本院2016年1月-2019年1月收治.其中24例接受单孔腹腔镜治疗(单孔组),24例接受多孔腹腔镜(多孔组).结果:组间对比显示单孔组的术中出血量少,住院时间短,并发症发生率低,较多孔组优势明显,差异显著(P<0.05).结论:单孔腹腔镜应用于腹腔镜卵巢囊肿剔除术疗效更为显著. 展开更多
关键词 卵巢囊肿 腹腔镜 剔除术 单孔 多孔 疗效
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氢氧化钾活化制备可再生多孔碳及其电催化氧还原性能研究 预览
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作者 何王涛 马汝广 +2 位作者 朱钰方 杨明杰 王家成 《无机材料学报》 CSCD 北大核心 2019年第10期1115-1122,共8页
氧还原反应缓慢的动力学过程严重限制了燃料电池的能量转换效率,而商用Pt/C催化剂成本太高、资源稀缺、稳定性差,需要寻找合适的材料来取代商用的Pt/C催化剂。近年来,氮掺杂多孔碳材料因其独特的物理和化学特性吸引了大量的关注。本文... 氧还原反应缓慢的动力学过程严重限制了燃料电池的能量转换效率,而商用Pt/C催化剂成本太高、资源稀缺、稳定性差,需要寻找合适的材料来取代商用的Pt/C催化剂。近年来,氮掺杂多孔碳材料因其独特的物理和化学特性吸引了大量的关注。本文使用富含氮元素的可再生土豆作为生物质前驱体,通过简单的一步热解过程和KOH活化方法相结合制备出了一系列氮掺杂多孔碳电催化剂;并系统研究了KOH用量和活化温度对碳基体孔结构和电催化性能的影响。结果表明,当活化温度为750℃、KOH与碳的质量比为3/1时,所制备的催化剂(NPC-750)的氧还原活性最高,起始电位和半波电位分别达到0.89和0.79V(vs.RHE),极限电流密度达到5.53mA·cm^–2。NPC-750优异的氧还原催化活性主要归因于其发达的孔结构、高的比表面积(1134.2m^2·g^–1)和合适的氮含量(1.57at%)。同时,优异的循环稳定性和抗甲醇中毒性能进一步说明这些生物多孔碳材料是潜在的低成本氧还原电催化剂。此外,这些高比表面积多孔碳在超级电容、吸附/分离、催化以及电池等领域也具有潜在的应用前景。 展开更多
关键词 生物质 多孔 氮掺杂碳 氢氧化钾活化 氧还原反应
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Preparation of Polysulfonamide Porous Paper and Its Adsorption Properties 预览
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作者 Sufeng Zhang Nan Zhang +1 位作者 Liwei Qian Min Du 《造纸与生物质材料:英文版》 2019年第3期23-29,共7页
Three-dimensional porous paper was prepared by using polysulfonamide (PSA) fiber and pulp as the raw materials. The effect of PSA fiber to pulp ratios on the mechanical strength and adsorption properties (using methyl... Three-dimensional porous paper was prepared by using polysulfonamide (PSA) fiber and pulp as the raw materials. The effect of PSA fiber to pulp ratios on the mechanical strength and adsorption properties (using methyl orange and rhodamine B dyes in their aqueous phase) of the paper were studied. The results showed that the tensile strength and elongation characteristics decreased as the PSA fiber to pulp ratio increased, while the tear strength increased. PSA paper showed good adsorption performance for both methyl orange and rhodamine B, with the adsorption process conforming to the pseudo-second-order and Langmuir isotherm models, indicating monolayer chemical adsorption. The study has provided an improved theoretical and scientific basis for the further development and application of PSA paper. 展开更多
关键词 POLYSULFONAMIDE PAPER mechanical STRENGTH ADSORPTION PROPERTY POROUS
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Controlled Synthesis of Core-Shell Nickel Microspheres with Solid Core and Porous Shell by Precipitation and Thermal Decomposition Method
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作者 李涛 MA Guohua +1 位作者 CHEN Jian GONG Yong 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第4期824-829,共6页
Nickel oxalate micro-spheres with core-shell structure of solid core and radiate shell were synthesized by precipitation method in a mixed water solution, with oxalic acid and nickel acetate as raw materials, through ... Nickel oxalate micro-spheres with core-shell structure of solid core and radiate shell were synthesized by precipitation method in a mixed water solution, with oxalic acid and nickel acetate as raw materials, through dropping ammonium hydroxide to adjust the solution pH value to about 8.0. Nickel microspheres with core-shell structure of solid core and porous shell were prepared by decomposing of nickel oxalate microspheres precursor at about 340 ℃ in argon atmosphere. The analyses of infrared spectroscopy(IR)indicates that the composition of the powders is nickel oxalate. The analyses of atomic absorption spectrometry(AAS) and organic elemental analysis(OEA) indicate that the molar ratio of(C2O4)^2-/Ni^2+ is about 1.02, close to the theoretical value of 1.0. The results of the thermo-gravimetric and differential thermal gravity analyses(TG-DTG) indicate that the molar ratio of(C2O4)^2-/Ni^2+ is about 1.06, also close to the theoretical value of 1.0.The analysis of X-ray diffraction(XRD) indicates that the composition of black powders as-prepared is nickel,which has a face-centered cubic crystal structure with average crystal grain size about 16.87 nm. The images of scanning electron microscopy(SEM) indicate that the morphology of nickel oxalate microspheres is a coreshell structure with solid core and radiate shell. The diameter of nickel oxalate microspheres is about 3 μm, and the shell consists of a large number of thin nanorods. The images of SEM also indicate that the morphology of nickel microspheres is a core-shell structure with solid core and porous shell. The diameter of nickel microspheres is about 2 μm, and the shell consists of a large number of nickel grains, surface holes and through holes. The diameter of nickel grains is about 50-100 nm, and the diameter of holes is about 50-200 nm. 展开更多
关键词 NICKEL OXALATE NICKEL CORE-SHELL POROUS PRECIPITATION THERMAL-DECOMPOSITION
Boosting the rate capability of multichannel porous TiCh nanofibers with well-dispersed Cu nanodots and Cu^2+-doping derived oxygen vacancies for sodium-ion batteries
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作者 Ying Wu Zengxi Wei +4 位作者 Rui Xu Yue Gong Lin Gu Jianmin Ma Yan Yu 《纳米研究:英文版》 CSCD 2019年第9期2211-2217,共7页
The use of TiO2 as an anode in rechargeable sodium-ion batteries(NIBs)is hampered by intrinsic low electronic conductivity of TiO2 and in ferior electrode kinetics.Here,a high-performa nee T1O2 electrode for NIBs is p... The use of TiO2 as an anode in rechargeable sodium-ion batteries(NIBs)is hampered by intrinsic low electronic conductivity of TiO2 and in ferior electrode kinetics.Here,a high-performa nee T1O2 electrode for NIBs is prese nted by desig ning a multicha rinel porous T1O2 nano fibers with well-dispersed Cu nan odots and Cu^2+-doping derived oxyge n vaca ncies(Cu-MPTO).The in-situ grow n well-dispersed copper nano dots of about 3 nm on TiO2 surface could significantly enhance electronic conductivity of the TiO2 fibers.The one-dimensional multichannel porous structure could facilitate the electrolyte to soak in,leadi ng to short tran sport path of Na^+through carb on toward the TiO2 nano particle.The Cu^2+-doping induced oxygen vacancies could decrease the bandgap of T1O2,resulting in easy electron trapping.With this strategy,the Cu-MPTO electrodes render an outstanding rate performance for NIBs(120 mAh·g^-1 at 20 C)and a superior cycling stability for ultralong cycle life(120 mAh·g^-1 at 20 C and 96.5%retention over 2,000 cycles).Density functional theory(DFT)calculations also suggest that Cu^2+doping can enhance the conductivity and electron transfer of T1O2 and lower the sodiation energy barrier.This strategy is confirmed to be a general process and could be extended to improve the performanee of other materials with low electronic conductivity applied in energy storage systems. 展开更多
关键词 multicha nnel POROUS T1O2 NANO fibers CU NANO dots Cu^2+dopi ng SODIUM ion batteries density functional theory(DFT)calculati ons
Flexible,Porous,and Metal–Heteroatom?Doped Carbon Nanofibers as Efficient ORR Electrocatalysts for Zn–Air Battery
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作者 Qijian Niu Binling Chen +3 位作者 Junxia Guo Jun Nie Xindong Guo Guiping Ma 《纳微快报:英文版》 CAS CSCD 2019年第1期147-163,共17页
Developing an e cient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparatio... Developing an e cient and durable oxygen reduction electrocatalyst is critical for clean-energy technology, such as fuel cells and metal–air batteries. In this study, we developed a facile strategy for the preparation of flexible, porous, and well-dispersed metal–heteroatom-doped carbon nanofibers by direct carbonization of electrospun Zn/Co-ZIFs/PAN nanofibers(Zn/Co-ZIFs/PAN). The obtained Zn/Co and N co-doped porous carbon nanofibers carbonized at 800 °C(Zn/Co–N@PCNFs-800) presented a good flexibility, a continuous porous structure, and a superior oxygen reduction reaction(ORR) catalytic activity to that of commercial 20 wt% Pt/C, in terms of its onset potential(0.98 V vs. RHE), half-wave potential(0.89 V vs. RHE), and limiting current density(-5.26 mA cm-2). In addition, we tested the suitability and durability of Zn/Co–N@PCNFs-800 as the oxygen cathode for a rechargeable Zn–air battery. The prepared Zn–air batteries exhibited a higher power density(83.5 mW cm-2), a higher specific capacity(640.3 mAh g-1), an excellent reversibility, and a better cycling life than the commercial 20 wt% Pt/C + RuO2 catalysts. This design strategy of flexible porous non-precious metal-doped ORR electrocatalysts obtained from electrospun ZIFs/polymer nanofibers could be extended to fabricate other novel, stable, and easy-to-use multi-functional electrocatalysts for clean-energy technology. 展开更多
关键词 Electrospinning Zn/Co-ZIFs Carbon nanofibers FLEXIBLE POROUS structure ORR Zn–air battery
Efficient catalytic hydrogen generation by intermetallic platinum-lead nanostructures with highly tunable porous feature
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作者 Bin E Lingzheng Bu +2 位作者 Qi Shao Yujing Li Xiaoqing Huang 《科学通报:英文版》 SCIE EI CSCD 2019年第1期36-43,共8页
The water-gas shift (WGS)reaction is an essential industrial reaction for upgrading hydrogen (H2)by removing carbon monoxide (CO),while highly efficient platinum (Pt)-based catalysts for WGS with simultaneously high a... The water-gas shift (WGS)reaction is an essential industrial reaction for upgrading hydrogen (H2)by removing carbon monoxide (CO),while highly efficient platinum (Pt)-based catalysts for WGS with simultaneously high activity and stability are still yet to be developed due to the poisoning issue during the reaction.Herein,we report on the porous PtPb peanut nanocrystals (porous PtPb PNCs)and porous PtPb octahedron nanocrystals (porous PtPb ONCs)with controllable ratios of Pt/Pb as extremely active and stable catalysts towards WGS reaction.It exhibits the composition-dependent activity with porous PtPb PNCs-40/ZnO being the most active for WGS to H2,16.9 times higher than that of the commercial Pt/C.The porous PtPb PNCs-40/ZnO also display outstanding durability with barely activity decay and negligible structure and composition changes after ten successive reaction cycles.X-ray photoelectron spectroscopy (XPS)results reveal that the suitable binding energy of Pt 4f7/12 and the high ratio of Pt(0) to Pt(Ⅱ)in porous PtPb PNCs/Zn0 and porous PtPb ONCs/ZnO are crucial for the enhanced WGS activity. The CO stripping results indicate the optimized CO adsorption strength on the Pt surface ensure the excellent WGS activity and the outstanding durability.The present work demonstrates an important advance in tuning the porous metal nanomaterials as highly efficient and durable catalysts for catalysis, energy conversion and beyond. 展开更多
关键词 POROUS Selective ETCHING Hydrogen Pt-Pb Water-gas shift
Humidity-responsive Bilayer Actuators Comprised of Porous and Nonporous Poly(acrylic acid)/Poly(aIlylamine hydrochloride)Films
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作者 Miao Zhen Tang-Jie Long +1 位作者 Xiao-Ling Chen Jun-Qi Sun 《高分子科学:英文版》 SCIE CAS CSCD 2019年第1期52-58,共7页
Bilayer humidity-responsive actuators are generally composed of actuating and supporting layers of different materials with largely different wettability.Such kinds of bilayer actuators suffer from low adhesive force ... Bilayer humidity-responsive actuators are generally composed of actuating and supporting layers of different materials with largely different wettability.Such kinds of bilayer actuators suffer from low adhesive force between the two layers during usage.This study demonstrates the preparation of humidity-responsive bilayer actuators that have the same materials in the actuating and supporting layers to avoid the adhesive issue.The bilayer actuators consist of a porous poly(acrylic acid)σAA)/poly(allylamine hydrochloride)(P AH)layer and a nonporous PAA/PAH layer that are fabricated by exponentially layer-by-layer assembly method.At a high/low relative humidity(RH),the nonporous PAAIP AH layer can efficiently expand/shrink by absorbing/desorbing water while the volume expansion/shrinkage of the porous PAA/PAH layer in an environment with changed humidity is significantly suppressed by the micrometer-sized pores.The largely different expansion/shrinkage of the nonporous and porous PAA/PAH layers when subjected to humidity changes enables rapid and reversible rolling/unrolling motions of the bilayer actuator.The bilayer actuator shows a faster rolling speed and a larger bending curvature when subjected to a larger humidity increase. 展开更多
关键词 Layer-by-layer assembly Materials science POROUS FILMS Surface chemistry
Porous graphene decorated silica as a new stationary phase for separation of sulfanilamide compounds in hydrophilic interaction chromatography
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作者 Lijun Song Haijuan Zhang +4 位作者 Tianpei Cai Jia Chen Zhan Li Ming Guan Hongdeng Qiu 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第4期863-866,共4页
Porous graphene (PG) has potential applications in numerous fields because of the existence of nanopores in the plane. In this study, porous graphene decorated silica microspheres (Sil-PG) were successfully fabricated... Porous graphene (PG) has potential applications in numerous fields because of the existence of nanopores in the plane. In this study, porous graphene decorated silica microspheres (Sil-PG) were successfully fabricated by assembling PG onto the silica particles surface in deep eutectic solvents (DESs). Experimental results demonstrate that this new stationary phase can facilitate the separation of six sulfonamides compounds in hydrophilic chromatographic conditions. The successful synthesis of the SilPG stationary phase provides a basis for the application of porous graphene-modified materials as the stationary phase for liquid chromatography, and offers the possibility to broaden the application of PG in the field of chromatography. 展开更多
关键词 POROUS GRAPHENE HYDROPHILIC interaction chromatography STATIONARY phase SULFONAMIDES Human serum samples
MoS2 decorated lignin-derived hierarchical mesoporous carbon hybrid nanospheres with exceptional Li-ion battery cycle stability
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作者 Feng Chen Long Wu +4 位作者 Zeping Zhou Jiajun Ju Zhengping Zhao Mingqiang Zhong Tairong Kuang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第1期197-202,共6页
Lignin is the most abundant and important macromolecule in organic matter and its yield is second only to cellulose. Lignin is abundant in source, low in price, and has a large number of active groups such as methoxy ... Lignin is the most abundant and important macromolecule in organic matter and its yield is second only to cellulose. Lignin is abundant in source, low in price, and has a large number of active groups such as methoxy group and carboxyl group, so it has great utilization value. We used lignin as a carbon source to prepare porous carbon nanosphere(PCN) materials, and in-situ synthesized the MoS2 on its surface. The high specific surface area(462.8 m^2/g), large pore volume and good electron conductivity of the porous carbon scaffold facilitated the reversible electro-chemical reaction of S towards metallic Li, and thus the nano-hybrid showed a high specific energy and excellent cycle stability which still remained 520m Ah/g after 50 cycles. 展开更多
关键词 LIGNIN MOS2 Porous carbon NANOSPHERE Electrochemical performance EXCELLENT cycle stability
Porous LiF layer fabricated by a facile chemical method toward dendrite-free lithium metal anode 预览
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作者 Yanxia Yuan Feng Wu +2 位作者 Guanghai Chen Ying Bai Chuan Wu 《能源化学:英文版》 CSCD 2019年第10期197-203,共7页
Lithium metal is supposed to be critical material for constructing next-generation batteries due to extremely high capacity and ultralow redox potential. However, the perplexing issue of lithium dendrite growth impede... Lithium metal is supposed to be critical material for constructing next-generation batteries due to extremely high capacity and ultralow redox potential. However, the perplexing issue of lithium dendrite growth impedes the commercial application. The initial nucleation and low Li ions diffusion rate in the electrolyte/electrode interface dominate the deposition behavior. Therefore, a uniform and flexible interface is urgently needed. Here, a facile method is proposed to prepare a thin and porous LiF-rich layer (TPL) by the in-situ reaction of small amount of ammonium hydrogen difluoride (NH4HF2) and Li metal. The deposition morphology on Li metal anode with LiF layer is significantly flat and homogeneous owning to low lateral diffusion barrier on LiF crystals and the porous structure of TPL film. Additionally, the symmetrical cells made with such TPL Li anodes show significantly stable cycling over 100 cycles at high current density of 6 mA/cm^2. The TPL Li|LiFePO4 full cells keep over 99% capacity retention after 100 cycles at 2.0 C. This approach serves as a facile and controllable way of adjusting the protective layer on Li metal. 展开更多
关键词 LITHIUM metal anode POROUS LIF LAYER LITHIUM DENDRITE Artificial SEI
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声频工程中空间吸声体特性及应用 预览
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作者 丁雷 《电声技术》 2019年第6期1-4,共4页
空间吸声体是一种用途广泛的吸声结构,具有非常高的吸声性能。对空间吸声体的形式与构造进行了详细论述,阐述了空间吸声体的吸声性能,分析影响空间吸声体吸声性能的最主要因素,对其应用场合及特点作了说明。
关键词 声频工程 多孔 吸声体 材料 构造
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Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al2O3/Au nanoparticles
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作者 张欣 邵丽萍 +3 位作者 彭嫚 白忠臣 张正平 秦水介 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第6期429-432,共4页
We present a self-assembly method to prepare array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al2 O3 film modified by gold nanoparticles. The photoluminescence(PL) spectra of nanowires are in s... We present a self-assembly method to prepare array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al2 O3 film modified by gold nanoparticles. The photoluminescence(PL) spectra of nanowires are in situ measured by using a scanning near-field optical microscopy(SNOM) probe tip with 100-nm aperture on the scanning near-field optical microscope. The results show that the binding sites from the edge of porous Al2 O3 nanopores are combined with the carboxyl of CdSe quantum dots’ surface to form an array of CdSe nanowires in the process of losing background solvent because of the gold nanoparticles filling the nano-holes of porous Al2 O3 film. Compared with the area of nonself-assembled nano-wire, the fluorescence on the Al2 O3/Au/CdSe interface is significantly enhanced in the self-assembly nano-wire regions due to the electron transfer conductor effect of the gold nanoparticles’ surface. In addition, its full width at half maximum(FWHM) is also obviously widened. The method of enhancing fluorescence and energy transfer can widely be applied to photodetector, photocatalysis, optical display, optical sensing, and biomedical imaging, and so on. 展开更多
关键词 enhanced PHOTOLUMINESCENCE Cd Se NANO-WIRE COLLOIDAL SELF-ASSEMBLED method porous Al2O3 film
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