POLYMER BULLETIN
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2020
·Vol. 78
·期 7
·3785-3801
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IF 2.014
Ma Yu,Wang Lulu,Feng Ruijiang,Wang Jilin,Cai Tianzhou
In this study, we prepared a novel composite membrane (QCS-IRMOF-3) by attaching IRMOF-3 (metal–organic framework materials, formed by coordination of metallic zinc and 2-aminoterephthalic acid) with a free amino group to a quaternized chitosan (QCS) by chemical cross-linking. The successful synthesis of IRMOF-3 was verified by SEM, XRD, and FT-IR. Then, the mechanical properties, swelling properties, ion exchange capacity, hydroxide conductivity and chemical stability of the composite membrane (QCS-IRMOF-3) were also investigated. It was found that the performance of the aforementioned composite membrane was affected obviously by the amount of IRMOF-3 crystals. The composite membrane doped with 15 wt% IRMOF-3 crystals exhibits better overall performance, which included that the tensile strength is 22.4 MPa, water uptake is 78.4%, hydroxide conductivity is 29.9 mS cm −1 at 80 °C, and after immersion in 6.0 mol L −1 KOH solutions at 60 °C for about 240 h, only the conductivity decreased by less than 10%. This result implies that the composite membrane synthesized in this research is promising for application in alkaline polymer electrolyte fuel cells.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
·
IF 7.305
Dongya Li,Hong Zhong
Solar driven steam generation is a typical application of solar energy harvesting for clean water production, which has undergone a long-term development. Up to now, a desirable evaporation efficiency has been achieved in lab-scale via advanced materials and structural design However, to maintain a stable performance for long-term practical application, the simplicity of fabrication process, the cost of the raw material and the salt accumulation issue have to be taken into consideration. Here, this research proposed an efficient solar evaporator based on laser induced graphene (LIG) and the commercialized nickel foam. The nickel foam was preferred as the skeleton of the evaporator coupling with hydrophilic polyvinyl alcohol (PVA) to provide sufficient water pathways with reduced water vaporization enthalpy in the bottom layer of the solar evaporator. In addition, plasmonic antimony doped tin oxide (ATO) nanoparticles were introduced into the porous graphene to further enhance the solar absorption and photothermal conversion. Thus, the 3D evaporator exhibits a high evaporation efficiency of 2.21 kg m −2 h −1 in salt water (20 wt% NaCl) under 1 solar irradiation (1 kw m −2 ). Moreover, the evaporator enables a stable evaporation performance upon the saline water during a 120 h test, with no salt crystals accumulated on the surface of evaporator. It is believed that this work presents a potential simple pathway to design and fabricate a portable and efficient evaporator equipped with efficient LIG nanocomposite as an efficient solar absorber .
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Juan Bi,Yuxin Liang,Yang Bai,Baoning Cui,Zhaopeng Lu,Bangsheng Li
A novel ternary medium-entropy perovskite oxide , (Sr 1/3 Ba 1/3 Ca 1/3 )TiO 3 , is reported for thermoelectric applications; it was synthesized via solid-state reaction and graphite burial sintering. The formation and stability of the single-phase structure were evaluated using thermodynamic calculations and the Goldschmidt’s tolerance factor. The material was found to have a single-phase cubic perovskite structure with a homogeneous distribution of all elements. The medium entropy generates moderate carrier mobility , while the band flattening yields high Seebeck coefficient, resulting in a high power factor of 378.8 μW·m −1 ·K −2 at 773 K. The enhanced multi-phonon scattering derived from the medium entropy, oxygen vacancies , and porous structure significantly reduced the lattice thermal conductivity , with a lowest value of 1.90 W·m −1 ·K −1 at 773 K. As a result, a ZT max of 0.13 was attained at 773 K, which outperforms that of high-entropy SrTiO 3 -based oxides. This work provides a new direction to obtain high-performance thermoelectric materials through medium-entropy composition design.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shangqing Qu,Jinhao Chen,Jikun Chen,Guohong Cai,Yonggang Wang,Zhongnan Guo,Jing Zhao,Quanlin Liu
Pavonite homologues are semiconductors that show potential for thermoelectric applications. Herein, we report the synthesis of a quaternary selenide, In 0.5 Mn 2 Bi 3.5 Se 8 , that exhibits good thermal stability below 1032 K. Whereas most pavonite compounds exhibit the metallic properties of degenerate semiconductors, In 0.45 Mn 2.17 Bi 3.38 Se 8 possesses a band gap of 0.85 eV. In addition, its electrical conductivity and Seebeck coefficient exceed 3 S/cm and 300 μV/K at 810 K, respectively, with the compound mainly displaying semiconductor properties . In 0.45 Mn 2.17 Bi 3.38 Se 8 exhibits paramagnetism at room temperature followed by a paramagnetic-to-antiferromagnetic transition at ∼10.2 K. Our findings enrich the current understanding of the pavonite homologous series, providing useful insight for future exploration in related fields.
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SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Maolu Wang,Xinjian Wang,Junyan Liu,Jiacheng Wei,Zhangwen Shen,Yang Wang
Surface texturing is an effective way for friction-reduction in hydrodynamic lubricating conditions. In this paper, an additive manufacturing method of selective laser melting of ink-printed copper nanoparticles (SLM-IP Cu NPs) was introduced. Concave squared textures, convex squared textures and fully sintered Cu film were fabricated. The tribological performances of the fabricated samples showed that the convex squared texture possesses a better friction-reducing ability than the concave textures and the full Cu film. Moreover, the relationship between the dimensional parameters of the convex textures and the friction-reducing ability was also experimentally studied. The lubricating condition was analyzed to show that the surface structures fabricated by SLM-IP Cu NPs can provide the surface with a friction-reducing ability in mixed lubrication .
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Chemistry of Heterocyclic Compounds
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2018
·Vol. 54
·期 2
·125-129
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IF 1.201
Gao Huiqin,Wu Xiangwen
A 3-hydroxyflavone derivative as fluorescence chemosensor for copper and zinc ions has been synthesized. Its recognition properties for copper and zinc ions in aqueous solution were investigated based on UV-vis absorption and fluorescence spectra change. The compound exhibits color change from colorless to yellow and quenching of green fluorescence in the presence of copper ions in aqueous solution due to coordination reaction. In turn, the addition of zinc ions induces the color change from colorless to green and fluorescence enhancement of the compound. The complex ratios between the sensor molecule and copper(zinc) ions are 1:1 and 1:2, respectively, based on the Job's plots and in situ mass spectra. Thus, this compound can selectively recognize copper and zinc ions, and the recognition also can be observed by naked eye.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Peng Wei,Yanxiang Liu,Zhihao Wang,Yangyang Huang,Yu Jin,Yi Liu,Shixiong Sun,Yuegang Qiu,Jian Peng,Yue Xu,Xueping Sun,Chun Fang,Jiantao Han,Yunhui Huang
NaTi2(PO4)3 (NTP) with a sodium superionic conductor three-dimensional (3D) framework is a promising anode material for sodium-ion batteries (SIBs) because of its suitable potential and stable structure. Although its 3D structure enables high Na-ion diffusivity, low electronic conductivity severely limits NTP’s practical application in SIBs. Herein, we report porous NTP/C nanofibers (NTP/C-NFs) obtained via an electrospinning method. The NTP/C-NFs exhibit a high reversible capacity (120 mA h g–1 at 0.2 C) and a long cycling stability (a capacity retention of ∼93% after 700 cycles at 2 C). Furthermore, sodium-ion full cells and hybrid sodium-ion capacitors have also been successfully assembled, both of which exhibit high-rate capabilities and remarkable cycling stabilities because of the high electronic/ionic conductivity and impressive structural stability of NTP/C-NFs. The results show that the nanoscale-tailored NTP/C-NFs could deliver new insights into the design of high-performing and highly stable anode materials for room-temperature SIBs.
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Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 21
·3246-3253
·
IF 3.692
Sanyin Qu,Qin Yao,Bingxue Yu,Kaiyang Zeng,Wei Shi,Yanling Chen,Lidong Chen
Graphical Weight problem : Poly(3-hexylthiophene) (P3HT) films with various molecular weights are successfully prepared, and both their molecular structures and thermoelectric (TE) properties are investigated. The molecular weight of P3HT is found to have an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also has an effect on the TE performance. Poly(3-hexylthiophene) (P3HT) films with various molecular weights (MWs) were successfully prepared, and both their molecular structures and thermoelectric (TE) properties were investigated. It was found that the molecular weight of P3HT had an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also had an effect on the TE performance. The electrical conductivity of the P3HT films first increased upon increasing the molecular weight and then decreased at high molecular weights, whereas the Seebeck coefficient remained at the same level. As a result, the P3HT-M 50k (MW≈50 000 g mol −1 ) film reached an electrical conductivity of (103.8±1.2) S cm, which is more than 20 times higher than the electrical conductivity of P3HT-M 10k (MW≈10 000 g mol −1 ) and almost 30 % higher than the electrical conductivity of P3HT-M 100k (MW≈100 000 g mol −1 ). Consequently, the maximum TE power factor of P3HT-M 50k at room temperature was as high as (22.6±0.6) μW mK −2 , which is much higher than that of either P3HT-M 10k or P3HT-M 100k . Microstructure analysis combined with C-AFM suggested that carrier transport between most of the ordered and amorphous regions was unconnected in films with low molecular weights, and this resulted in a high migration barrier and poor carrier mobility. Upon increasing the molecular weight, the long molecular chain provided enough connectivity for the charge to move through the ordered regions, which decreased the carrier barrier and increased carrier mobility. Therefore, both the conductivity and Seebeck coefficient were significantly improved. However, a too-high molecular weight could cause more folding of the polymer chain, which would deteriorate the electrical-transport properties. The experimental results not only reveal the intrinsic effect of molecular weight on the electric transporting properties of conducting polymers but also suggest that molecular-weight engineering is an effective way to design and screen high-performance polymer TE materials.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Xiaoyan Pei,Wangyue Song,Yunlei Shi,Yang Zhao,Zhiyong Li
Pickering emulsions with a stimulus response have been paid extensive concern due to their long-term stability and demulsification on-command. Metal-organic frameworks (MOFs) are expectable emulsifying agents to build Pickering emulsions based on their excellent properties such as high specific surface area, adjustable porosity and pore size. Herein, a novel kind of CO 2 -triggered Pickering emulsions formed by (3-aminopropyl)triethoxysilane (APTES)-functionalized M-MOF-74 (M-MOF-74-APTES, M = Zn, Cu or Mg) has been developed for the first time. It was found that even at the M-MOF-74-APTES amount of 0.5 wt%, the functionalized MOFs could still stabilize the n-hexane-water mixture to construct Pickering emulsions. The as-generated Pickering emulsions could be efficiently demulsified upon bubbling of CO 2 , resulting in complete separation of oil and water phases, but could be restored by subsequent N 2 bubbling under homogenization. Mechanism study indicated that the acid-base reaction of CO 2 with the amino group of M-MOF-74-APTES resulted in the creation of hydrophilic salts, which led to the lowering of particle wettability and broke the stability of the emulsion, causing demulsification of the Pickering emulsion. After removing CO 2 , the emulsion can be reconstructed by the reversible reaction. As an applied example, the Pickering emulsion has been availed as a micro-reaction system and M-MOF-74-APTES as a carrier of Pd(OAc) 2 catalyst to realize the efficient combination of Suzuki-Miyaura reaction, product isolation and reuse of catalysts via alternate bubbling or removing of CO 2 .
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Small Methods
·
2024
·Vol. 8
·期 12
·2400143
·
IF 10.7
Shouying Mu,Ye He,YueLi Wang,Wei Chen,Chunyan Lv,Xiaojuan Liang,Weidong Xiang,Zhaopin Chen
Perovskite quantum dots can form various forms such as nanowires, nanorods, and nanosheets through self-assembly. Nanoscale self-assembly can be used to fabricate materials with excellent device properties. This study introduces AuBr 3 into CsPb(Br/I) 3 quantum dots, causing them to assemble into nanowires. The nanowires form because part of Au 3+ is surface-doped to replace Pb 2+ , and the [PbX6] 4− octahedral structure is distorted. The symmetry of the structural surface is broken, and a dipole-moment-induced field is generated, thus promoting self-assembly. Moreover, the presence of Au nanoparticles (NPs) causes a localized surface plasmon resonance and generates strong van der Waals forces that promote self-assembly. Finally, to test other applications of perovskite nanowires, the solution method is used to prepare films by compounding the sample solution and polystyrene (PS) for backlighted displays.
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TETRAHEDRON
·
2017
·
IF 2.651
Ling-Ling Wu,Gao H. Yang,Zhi Guan,Yan-Hong He
The Rose Bengal sensitized intermolecular [2 + 2]-cycloaddition of 3-ylideneoxindoles for the synthesis of spirocyclic oxindoles was developed successfully under visible light irradiation conditions. The cycloaddition products were obtained in good yields (up to 93%) with excellent diastereoselectivity and regioselectivity by using a low loading of Rose Bengal (0.125 mol%) as a triplet sensitizer. This work demonstrates the potential benefits of Rose Bengal in visible light catalysis.
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JOURNAL OF MOLECULAR LIQUIDS
·
2015
·
IF 2.515
Airong Xu,Yajuan Zhang,Zhiyong Li,Jianji Wang
In the present work, seven 1-allyl-3-methylimizodalium carboxylate ionic liquids (ILs), including 1-allyl-3-methylimizodalium formate [Amim][HCOO], acetate [Amim][CH 3 COO], propionate [Amim][CH 3 CH 2 COO], butyrate [Amim][CH 3 (CH 2 ) 2 COO], glycollate [Amim][HOCH 2 COO], lactate [Amim][CH 3 CHOHCOO]) and benzoate [Amim][C 6 H 5 COO], have been synthesized and characterized. Density ( ρ ) and conductivity ( σ ) have been determined experimentally for these ILs at 298.15 K and atmospheric pressure. Then molar volume ( V m ), standard entropy ( S °), lattice energy ( U POT ) and molar conductivity ( Λ ) of the ILs have been derived from the density and conductivity data. Ionicity of the ILs has been estimated using the Walden plot. Meanwhile, how anionic structure of the ILs affects the volumetric and conductivity properties of 1-allyl-3-methylimidazolium carboxylate ILs has been discussed from the analysis of structure–property relationship.
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