Nanoscale
·
2016
·Vol. 8
·期 40
·17489-17495
·
IF 7.76
Zhixiang Lu,Mingjiang Wu,Shuang Wu,Shaoxiong Yang,Yuan Li,Xiaolan Liu,Liyan Zheng,Qiue Cao,Zhongtao Ding
Transformation of aggregation induced emission (AIE) molecules into functional materials can greatly tune their fluorescence properties and expand their related potential applications. Here, we demonstrate a facile strategy to modulate the fluorescence properties of AIE molecules by confining them within the nanochannels of metal–organic frameworks (MOFs). AIE molecules (4,4′-(hydrazine-1,2-diylidene bis(methanylylidene)) bis(3-hydroxybenzoic acid), HDBB) with pH-dependent emission were successfully integrated into UiO-66 resulting in a UiO-66⊃HDBB complex while maintaining the crystal structure by the host–guest process. The fluorescence properties of HDBB can be modulated by virtue of the unique nanospace confining effect. Furthermore, UiO-66⊃HDBB was used as a sensitive and selective fluorescent probe for Cu2+ detection in aqueous solution. This study provides a facile strategy for the construction of high performance AIE based luminescent materials with adjustable properties for potential applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Jiaqi Xu,Qilang Lin,Yan Yu,Dongyang Chen,Zhuoliang Ye
Linear fluorinated poly(arylene ether)s with and without pendent allyl groups (CFPAE and FPAE) were successfully polymerized from decafluorobiphenyl at room temperature . The subsequent SN 2 nucleophilic substitution of the remaining F atom on CFPAE and FPAE with sodium 4-hydroxybenzenesulfonate yielded SCFPAE and SFPAEs in one simple step under mild conditions. The chemical structures of the polymers were confirmed by 1 H NMR and FT-IR. The ion exchange capacity (IEC), inherent viscosity, water uptake, swelling ratio, proton conductivity , mechanical property, thermal stability, and oxidative stability of the SFPAEs were characterized. The experimental results revealed that the IEC of the SFPAEs can be facilely controlled by the loading amount of sodium 4-hydroxybenzenesulfonate in the reaction mixture. The SFPAE-20 with an IEC of 2.0 mmol g −1 exhibited an in-plane proton conductivity of 106 mS cm −1 at 30 °C, higher than that of Nafion N212. More importantly, the SFPAEs showed significantly enhanced oxidative stabilities compared to sulfonated non-fluorinated analogs in literature. While there was still a trade-off between proton conductivity and mechanical strength as often seen for homogeneous systems, the SFPAEs were demonstrated to be promising candidates for proton exchange membranes .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhuang Zhuang,Duo Qi,Chunyu Ru,Jing Pan,Chengji Zhao,Hui Na
This study presented a novel polymeric humidity sensor based on CaCl 2 -doped sulfonated poly (ether ether ketone) (SPEEK). For the first time, we developed a crosslinking procedure to modify SPEEK for humidity sensors application. SPEEKs with fixed value of sulfonation degree were synthesized by a direct aromatic nucleophilic substitution polymerization of sulfonated monomers. The obtained polymer was used to prepare humidity sensitive composites by doping CaCl 2 , and then they were fabricated by spin coating on a ceramic substrate to use as a novel polymeric humidity sensor. Humidity-sensing performances were investigated by varying both CaCl 2 concentration and relative humidity. Comparing with the pristine polymer, CaCl 2 -doped SPEEK showed improved humidity sensing properties and the 10 wt%- CaCl 2 /SPEEK sensor showed the best sensing properties for high sensitivity, little hysteresis (1.14%), fast response (2 s)/recovery time (65 s) and outstanding stability. Additionally, the morphology and thermal properties of composites and the humidity sensing mechanism of the sensors were discussed in detail. Most importantly, CaCl 2 was employed not only as dopant to significantly improve the sensitivity, but also as cross-linker to reduce the sorption hysteresis. This study demonstrated that these humidity sensors could offer a great potential for applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Pengfei Huo,Shuling Zhang,Xingrui Zhang,Zhi Geng,Jiashuang Luan,Guibin Wang
A series of poly(aryl ether sulfone) copolymers containing quaternary ammonium moieties were obtained by polymerization of methylated copolymers, followed by bromination and derivatization with quaternary-ammonium groups. The copolymer membranes exhibited excellent thermal stability and mechanical properties . Symmetric supercapacitor single cells based on activated carbon and quaternary ammonium functionalized poly(aryl ether sulfone) membranes were fabricated into a three-layer structure: activated carbon electrode//quaternary ammonium functionalized poly(aryl ether sulfone) separator//activated carbon electrode and characterized by cyclic voltammetry , galvanostatic charge–discharge and electrochemical impedance spectroscopy in 6 M KOH aqueous solution. The coulombic efficiency of the supercapacitor was as high as 95% over 5000 cycles. The effect of different degree of quaternization of PAES copolymer separators on thermal and mechanical properties of separators and performance of the symmetric supercapacitor single cells were investigated.
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NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 38
·期 1
·448-454
·
IF 2.966
Lai-Jun Zhang,Xing-Can Shen,Hong Liang,Fa-Yun Chen,Hai-Jin Huang
ZnSe:Mn and core–shell ZnSe:Mn/ZnS doped quantum dots (d-dots) have been synthesized by using the alkylamine–H2Se complex and thiourea as new phosphine-free Se and S precursors, respectively. Absorption spectroscopy, steady-state (solution and solid-state) and time-resolved photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy were used to characterize the resulting d-dots. Results showed that Mn2+ was successfully doped and mainly distributed in the middle layer of the actual ZnSe/ZnSe:Mn/ZnSe d-dots and ZnSe/ZnSeS:Mn/ZnS d-dots which were simply referred to as ZnSe:Mn and core–shell ZnSe:Mn/ZnS d-dots with ZnSe and ZnS outmost shells, respectively. The increase in the intensity of phosphorescence from the dopant Mn2+ was obtained by the corresponding injection of Zn precursor or Zn/S precursors for ZnSe or ZnS shell growth. As compared to the ZnSe shell, the ZnS shell was grown more significantly on the surface of the ZnSe:Mn core, which led to larger d-dots due to a thicker ZnS shell and thus deeper doping of Mn2+ in the larger host. Outstanding improvement has been achieved in both phosphorescence intensity and stability after growth of the ZnS shell relative to the ZnSe shell. The corresponding phosphorescence efficiency of the resulting d-dot cyclohexane solution was enhanced from about 8% for the ZnSe:Mn d-dots to 35% for the ZnSe:Mn/ZnS d-dots.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 47
·20763-20768
·
IF 4.197
Lan Wang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
We reported temperature-dependent photoluminescence (PL) studies on Cu–Zn–In–S quantum dot (QD) thin films. In this paper, cadmium-free and luminescent Cu–Zn–In–S quantum dot thin films were in situ formed by thermal decomposition of molecular-based precursors in the open air, without need of the complicated quantum dot synthesis. Molecular-based precursor solutions were prepared by dissolving Cu2O, ZnO, and In(OH)3 in the ethanol solution of butylamine and carbon disulfide. The effects of sintering temperature, sintering time, and the concentration of capping agents on the photoluminescence properties of Cu–Zn–In–S QD thin films have been systematically investigated. It was found that alkali metal ions play an important role in enhancing the PL quantum yield of quantum dot thin films. The as-prepared QD thin films show composition-tunable emission in the range of 535 nm to 677 nm, and the absolute PL quantum yields can reach as high as 22.1%. All of the as-deposited QD thin films show a single-exponential decay to temperature, indicating that these cadmium-free QD thin films have high potential as temperature probes.
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POLYMER
·
2015
·
IF 3.562
Jiangtao Liu,Guofei Chen,Junchao Guo,Nafeesa Mushtaq,Xingzhong Fang
A series of cardo poly(ether ketone imide)s (PEKI-C) containing large-volume bulky phthalide groups were prepared by aromatic nucleophilic substitution reaction of commercially available phenolphthalein and 4,4′-bis(4-fluorophthalimido)diphenyl ether/4,4′-difluorobenzophenone. The glass transition temperatures ( T g s) increased from 221 to 278 °C with increasing the content of 4,4′-bis(4-fluorophthalimido)diphenyl ether moiety in the copolymerization . The 5% weight loss temperatures ( T 5% ) of PEKI-C ( a–e ) reached up to 472–495 °C in nitrogen and 466–481 °C in air. Flexible films, which could be easily cast from the polymer solutions , exhibited good mechanical properties with tensile strengths of 73–124 MPa, elongations at break of 9.7–12.8%, and tensile moduli of 2.2–2.8 GPa. Their films with cut-off wavelengths from 336 to 368 nm were transparent and essentially colorless. It is noted that the T g , T 5% , tensile strengths, elongations at break, and tensile moduli of PEKI-C ( a–e ) increased with increasing the content of 4,4′-bis(4-fluorophthalimido)diphenyl ether in the copolymerization.
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POLYMER
·
2015
·
IF 3.562
Jiuduo Xu,Weihai Zhang,Qiyang Jiang,Jianxin Mu,Zhenhua Jiang
A series of novel copoly(aryl ether sulfone)s with polydimethyl (PDMS) and double-decker-shaped silsesquioxane (DDSQ) in the main chain were synthesized by nucleophilic substitution polymerization approach. Dihydroxy terminated eugenosiloxanes (2OH-PDMS-n) and 3,13-di(2-methoxy-4-propylphenol)octaphenyl DDSQ (2OH-DDSQ) were synthesized. These two difunctional oligomers were used to copolymerize with 4-fluorophenyl sulfone to obtain poly(aryl ether sulfone) containing cage and linear organosiloxane (Si-PES) through one-step high-temperature solution method. Si-PES with multiple PDMS and DDSQ contents in the main chains were obtained by adjusting the molecular weight of 2OH-PDMS-n and controlling the molar ratio of 2OH-DDSQ to 2OH-PDMS-n. The dielectric constants sharply decreased as organosiloxane was introduced compared with traditional PES which the lowest value was achieved at 5% DDSQSi–PES (2.36 at 1 MHz). In addition, enhanced hydrophobic capacity peaks were obtained at 50% DDSQSi-PES surface hydrophobicity (113°) as the synergies of both linear organosiloxane and DDSQ. Furthermore, thermal and crystallization behaviors , as well as surface properties, were investigated.
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POLYMER BULLETIN
·
2017
·Vol. 74
·期 10
·4329-4348
·
IF 1.43
Zhou Jinfang,Chen Pei,Shi Qian,Wang Ruiqiang,Chen Xinbing,An Zhongwei
New poly(arylene ether sulfone) (PAES)-based anion-exchange membranes with side-chain aromatic benzyltrimethyl ammonium are synthesized, and their cross-linked membranes are prepared using tetramethyl alkylene diamine as a cross-linking agent. The new side-chain-type PAES-based membrane (Q) has acceptable hydroxide conductivity ( σ ) of 34 mS cm −1 (80 °C) and high chemical stability in hot alkali solution. Compared with Q, the corresponding series of cross-linked membranes exhibit much higher performance, such as higher dimensional stability and chemical stability, better oxidative stability, and lower methanol permeability ( P
M ). Among them, N , N , N ′, N ′-tetramethyl-1,6-diaminohexane-based cross-linked membrane (6CQ20) with IEC of 1.29 meq g −1 shows reasonably high σ of 35 mS cm −1 (80 °C) and low P
M of 0.20 × 10 −6 cm 2 s −1 , and displays high alkaline stability against alkali treatment at 60 °C for 216 h with small reduction in hydroxide conductivity by only 14%.
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Small
·
2024
·
IF 13
Ning Li,Yong Ma,Jiafeng Ma,Qing Chang,Xiangqian Fan,Lei Liu,Chaorui Xue,Caihong Hao,Huayang Zhang,Shengliang Hu,Shaobin Wang
MoS 2 /ZnIn 2 S 4 flower-like heterostructures into porous carbon (PC@MoS 2 /ZIS) are embedded. This ternary heterostructure demonstrates enhanced light absorption across a broad spectral range from 200 to 2500 nm. It features both Type-II and S-scheme dual heterojunction interfaces, which facilitate the generation, separation, and transfer of photoinduced carriers. The PC enveloped by MoS 2 /ZIS composite microspheres serves as a photothermal source, providing additional energy to the carriers. This process accelerates charge separation and migration, enhancing photothermal-assisted photocatalytic H 2 evolution. The optimal H 2 evolution rate for PC@MoS 2 /ZIS reaches an impressive 18.79 mmol g −1 h −1 , with an apparent quantum efficiency of 14.1% at 400 nm. This work presents a promising approach for effectively integrating multicomponent heterostructures with photothermal effects, offering innovative strategies for efficient solar energy utilization and conversion.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiao-Ming Zou,Tiao Zhang,Yu-Hua Dong,Cui Hu,Li Yin,Yu-Ling Zheng,Mi Li,Xiao-Yu Xiao,Wei Hui
Sulfonamide antibiotics (SAs) are widely used in the biomedical field but pose an environmental risk as ecotoxic pollutants. Developing eco-friendly methods to degrade SAs into harmless compounds is crucial. In this work, biochar (BC) was prepared from rice straw via pyrolysis and used to support S-nZVI, thereby forming the S-nZVI/BC composites. The results show high SAs removal efficiency (up to 98.3%) at optimal Fe/C and Fe/S molar ratios of 3:1 and 50:1, respectively, with strong tolerance to coexisting ions. Furthermore, the effectiveness of S-nZVI/BC(Fe 3 /C 1 , Fe 50 /S 1 ) sample was validated using five real wastewaters, and the results showed consistent performance, stability and reusability. Mechanistic studies revealed that S-nZVI/BC synergized with persulfate to enhance the reactivity of sulfate-free radical (SO 4− ·) and Fe 2+ . The degradation pathways of SAs, involving electrophilic substitution and nucleophilic attack, were elucidated by density functional theory (DFT) calculations. These insights were instrumental in comprehending the degradation mechanism of SAs. Additionally, the degradation dynamics of ten SAs were further analyzed using quantitative structure-activity relationship (QSAR) models and principal component analysis (PCA). Hence, this work highlights the potential of S-nZVI/BC for industrial wastewater treatment, providing insights into the degradation mechanisms and pathways of SAs.
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Crystals
·
2024
·Vol. 14
·期 8
·728
·
IF 2.4
Boyu Wang,Zhiyuan Jiang
Recently, there has been a growing interest in skutterudite (SKD) compounds containing electronegative elements such as Br, Cl, S, Se, and Te, owing to their increased diversity and the versatility of filler atoms. This study focused on the thermoelectric performance of a series of (Ni, Te) co-doped SKDs filled with the electronegative element S, denoted as SxNi0.4Co3.6Sb11.2Te0.8(x= 0, 0.1, 0.2, and 0.3). These compounds were prepared using a combination of a solid-state reaction and spark plasma sintering techniques. The results showed that (Ni, Te) co-doping introduced excess electrons in the SKD lattice, while the incorporation of the element S into the SKD voids optimized carrier concentration. This led to a considerable increase in the absolute Seebeck coefficient to 110.6 μV K−1at ambient temperatures. The presence of S fillers induced phonon resonance scattering and point scattering, which reduced lattice thermal conductivity and ultimately improved the thermoelectric figure of meritzT, which reached 0.93 for S0.3Ni0.4Co3.6Sb11.2Te0.8at 823 K.
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