Journal of Materials Chemistry B
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2022
·Vol. 10
·期 9
·1442-1452
·
IF 7.571
Xueying Sun,Haixiao Wang,Yi Ding,Yuanqing Yao,Yaqing Liu,Jun Tang
Flexible strain sensors are attracting enormous attention due to their high stretchability and sensitivity that are required for wearable devices and electronic skin. However, diverse application environments require materials whose hardness can be adjusted to satisfy different demands. Herein, we developed a synergistic dual network hydrogel PANI-P(AAm-co-AA)@Fe3+ composed of an iron-coordinated poly(acrylamide-co-acrylic acid) network and a conductive polyaniline network with adjustable mechanical properties and high sensitivity. Through controlling the degree of protonation, the cross-linking density will be changed and the mechanical properties of PANI-P(AAm-co-AA)@Fe3+ can be regulated in a wide range (ultimate tensile stress: 0.0710–0.3054 MPa) (fracture strain: 145–880%). Besides, the host–guest interaction between β-cyclodextrin (β-CD) and polyaniline improves the compatibility of polyaniline in a hydrogel substance and leads to the formation of homogenous interpenetrating networks, which provide PANI-P(AAm-co-AA)@Fe3+ with outstanding and steady conductivity (2.03–3.67 S m−1). Furthermore, PANI-P(AAm-co-AA)@Fe3+ exhibits highly linear sensitivity, a wide working region (gauge factor = 0.48 at 0–400% strain) and excellent durability (300 cycles). A strain sensor based on this hydrogel can detect not only large movements such as bending fingers and wrists but also delicate movements such as swallowing and a pulse, indicating its enormous potential in wearable devices, human health monitoring, electronic skin, human–machine interactions and so on.
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Nanomaterials
·
2022
·Vol. 12
·期 2
·213
·
IF 5.719
Hongli Ye,Lukai Zhao,Xinghui Ren,Youqiong Cai,Hai Chi
An approach to the detection of F−ions in food samples was developed based on a “switch-off-on” fluorescence probe of silicon nanoparticles (SiNPs). The fluorescence of the synthetic SiNPs was gradually quenched in the presence of Fe3+ion and slightly recovered with the addition of F−ion owing to the formation of a stable and colorless ferric fluoride. The fluorescence recovery exhibited a good linear relationship (R2= 0.9992) as the concentration of F−ion increased from 0 to 100 μmol·L−1. The detection limit of the established method of F−ion was 0.05 μmol·L−1. The recovery experiments confirmed the accuracy and reliability of the proposed method. The ultraviolet–visible spectra, fluorescence decays, and zeta potentials evidenced the fluorescence quenching mechanism involving the electron transfer between the SiNPs and Fe3+ion, while the fluorescence recovery resulted from the formation of ferric fluoride. Finally, SiNPs were successfully applied to detect F−ions in tap water, Antarctic krill, and Antarctic krill powder.Keywords:determination;Fe3+ion;F−ion;fluorescence switch-off-on;silicon nanoparticles;Antarctic krill
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Jiaqiang Liu,Xiandi Yu,Yan Xu,Yifang Zhao,Dan Li
Structural delamination of bulk layered metal–organic frameworks (MOFs) remains a great challenge, largely owing to a lack of general synthetic strategies. Here, we reported a simple solvent-free intercalation strategy for the delamination of rare-earth-based MOF (RE-MOF) with a topology structure of MIL-78 by tuning the chain length of quaternary ammonium salts. Four types of quaternary ammonium salts, involving tetraethylammonium bromide (TEAB), tetrapropylammonium bromide (TPAB), tetrabutylammonium bromide (TBAB), and hexadecyl trimethyl ammonium bromide (CTAB) were introduced to investigate their intercalation capabilities. It is evident in our case that the interruption/intercalation behavior of quaternary ammonium salts differs with their steric structures, and the chain-like CTAB can induce obvious delamination of MIL-78 crystals. Particularly, the CTAB-intercalated ultrathin Eu-based MIL-78 nanosheets exhibited unique selective photoelectrochemical sensing property toward trace amounts of Fe3+ ions in aqueous solution with a detection limit of 0.0899 μM at a signal-to-noise ratio of 3. These results demonstrated a green bottom-up strategy to obtain high-quality RE-MOF nanosheets for potential photocurrent response applications.
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ENERGY
·
2020
·
IF 6.082
Shuai Chen,Wei Zhou,Yani Ding,Guangbo Zhao,Jihui Gao
Fe 3+ -mediated coal-assisted water electrolysis (CAWE) for hydrogen production is an effective way to utilize coal resources. Low-rank coal, which has a high abundance, is rich in mineral matter and oxygen-containing functional groups (OGs). To promote the development of Fe 3+ -mediated CAWE of low-rank coal, the roles of mineral matter and OGs in Fe 3+ -mediated CAWE are investigated in this study. Besides, to understand the reaction mechanism of coal electrolysis and provide guidance for the effective use of electrolyzed coal, the microstructural, surface structure, and microcrystalline changes of the coal are analyzed via Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, respectively. The results show that minerals and OGs have a positive and negative influence on the Fe 3+ -mediated CAWE, respectively. The hydrogen yields of demineralized coal and oxidized coal are 33.15% and 68.47% lower than that of raw coal owing to the influence of minerals and OGs, respectively. After electrolysis, the degree of aromatic ring condensation increases whereas coal rank decreases; the content of –OH on the coal surface increases and the composition of organic sulfur on the coal surface is altered; and the crystallite diameter of the coal changes.
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FOOD CHEMISTRY
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2020
·
IF 6.306
Xianfeng Lin,Qianru Yu,Wei Yang,Chuxian He,You Zhou,Nuo Duan,Shijia Wu
Herein, a new double-enzymes-modulated fluorescent assay based on the quenching of upconversion nanoparticles (UCNPs) by Fe 3+ was constructed for sensitive determination of OPs. OPs can inhibit the activity of acetylcholinesterase to reduce the production of choline and further lead to the lack of H 2 O 2 in the presence of choline oxidase. Therefore, Fe 2+ cannot be converted into Fe 3+ , resulting in “turn-on” fluorescence of UCNPs. Under optimal conditions, an excellent linear correlation between the inhibition efficiency and the logarithm of the chlorpyrifos concentration was achieved with a detection limit (LOD) of 6.7 ng/mL in the range of 20–2000 ng/mL. The recovery for chlorpyrifos in apples and cucumbers was 89.5–97.1%. The results were consistent with those obtained by GC–MS. Overall, the integration of UCNPs into the double-enzymes-mediated Fe 3+ /Fe 2+ conversion endows this method with desirable rapidity, sensitivity, selectivity, stability, operational simplicity, and strong anti-interference capability, holding great potential in the application of food safety.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 33
·335501
·
IF 3.551
Quan Li,Zhiwei Guo,Xiaoyan Zhao,Taoyi Zhang,Jing Chen,Yun Wei
The novel nitrogen-doped carbon quantum dots (N-CQDs) with high fluorescence quantum yield of 23.2% were successfully prepared via a simple hydrothermal reaction with citric acid and 2,2'-dipicolylamine. The as-prepared blue fluorescent N-CQDs had excellent water dispersibility, and showed pH and excitation-dependent emission behaviors. Noticeably, owing to the strong interaction between the residual 2,2'-dipicolylamine group on the surface of N-CQDs and Fe3+, the N-CQDs could be used as a turn off fluorescence probe for Fe3+ sensing through an electron transfer process. Moreover, the photoluminescent N-CQDs/poly(vinyl alcohol) film was further applied for latent fingermark imaging.
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ENERGY & FUELS
·
2021
·
IF 3.605
Yunfei Yan,Jianbo Li,Tao Jia,Haojie Li,Kaiming Shen,Ziqiang He
TiO2-based photocatalysts are promising materials that show great potential in the field of catalysis due to their excellent properties including nontoxicity, high photocatalytic performance, and outstanding thermal and chemical stability. However, several challenges exist regarding TiO2 applications for catalytic hydrogen production. In this work, Fe- and graphene-comodified TiO2 (Fe–rGO/TiO2) was synthesized via a two-step solvothermal method. In addition, the effect of Fe3+ and graphene addition upon the catalytic performance of TiO2 was investigated based on the ammonia borane hydrogen production reaction, and the catalysts were characterized by SEM, XRD, XPS, UV–vis, FT-IR, and Raman methods. Batch experiments showed that the synthesized Fe–rGO/TiO2 composites exhibited high photocatalytic performance for hydrogen production from ammonia borane under visible-light irradiation. Moreover, the highest photocatalytic hydrogen production rate (1235.32 μmol·min–1·gcat–1) of 2%Fe–1%rGO/TiO2 was observed under visible-light irradiation at 25 °C, and the photocatalytic activity of the sample remained almost unchanged after the fifth cycle. The XRD, XPS, FT-IR, and Raman analyses showed that Fe and graphene successfully modified TiO2 and the presence of Ti4+. In addition, the extended visible-light absorption range and a reduction of the band gap of Fe–rGO/TiO2 were demonstrated by UV–vis diffuse reflectance spectra and calculation of the band gap. Also, the preparation of hydrogen from the hydrolysis of ammonia borane photocatalyzed by TiO2 composites was discussed. These findings are crucial for designing TiO2-based photocatalysts with high performance for photocatalytic hydrogen production.
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Polymers
·
2019
·Vol. 11
·期 11
·1832
·
IF 3.164
Weili Peng,Zeping Zhang,Minzhi Rong,Mingqiu Zhang
A kind of core-shell hybrid nanoparticle comprised of a hollow mesoporous silica nanoparticles (HMS) core and a copolymer shell bearing N-(3,4-dihydroxyphenethyl) methacrylamide (DMA) and N-isopropylacrylamide (NIPAM) as responsive moieties was prepared. Moreover, the factors that could impact the surface morphology and hierarchical porous structure were discussed. In the presence of Fe3+, catechol-Fe3+complexes were formed to achieve pH-responsive polymer shell, combining with thermal-sensitiveness of poly(N-isopropylacrylamide). Doxorubicin (DOX) was applied as a model drug and the behaviors of its loading/release behaviors were investigated to prove the idea. The results exhibited a significant drug loading capacity of 8.6% and embed efficiency of 94.6% under 1 mg ml–1DOX/PBS solution. In fact, the loading capacity of drug can be easily improved to as high as 28.0% by increasing the DOX concentration. The vitro cytotoxicity assay also indicated that the as-prepared nanoparticles have no significant cytotoxicity on RAW 264.7 cells. The in vitro experiment showed that the cumulative release of DOX was obviously dependent on the temperature and pH values. This pH/temperature-sensitive hollow mesoporous silica nanosphere is expected to have potential applications in controlled drug release.Keywords:hollow mesoporous silica microspheres;thermo-responsive;pH-responsive;catechol-Fe3+;controlled release
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APPLIED CATALYSIS A-GENERAL
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2018
·
IF 4.521
Wenjuan Shuai,Cun Liu,Yuheng Wang,Fengxiao Zhu,Dongmei Zhou,Juan Gao
Diethyl phthalate ester (DEP) can be degraded in Fe 3+ -UV- aliphatic/phenolic carboxyl acids systems, and the degradation can be significantly influenced by different physical chemical properties of the organic acids. In this study, a density function theory (DFT) approach combined with multilinear regression analysis demonstrates that the lowest unoccupied molecular orbital energy ( E LUMO ) significantly negatively influenced DEP degradation. The correlation coefficient of the regression is −19.3 mM L −1 h −1 . The standardized partial correlation coefficient is −0.674. The aliphatic acids group has higher catalytic ability than the phenolic carboxyl acids group, and by shifting the dominant LUMO configuration from C 3s3d to Fe 4s3d orbitals, Fe 3+ significantly accelerates the catalytic reactions of the aliphatic acids/UV systems. Further analysis demonstrates that electron withdrawing hydroxyl group on the aliphatic acids increases the photo catalytic effects of aliphatic acids/UV system. This study highlights the important role of E LUMO of organic acids on their photocatalytic ability towards degradation of organic pollutants .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Xiaoxia Ye,Yiwen Cui,Le Ke,Kaiyang Gao,Xin Huang,Bi Shi
A robust and 3D superhydrophobic composite sponge was facilely prepared by stable coating of multiple walled carbon nanotubes (MWCNTs) onto melamine sponge (MS) using polyphenol-Fe 3+ complexes as the low-cost and efficient adhesives. The as-prepared superhydrophobic composite sponges featured ultra-low density, large porosity, high robustness and elasticity, as well as flame resistance. The loading of MWCNTs influenced the superhydrophobicity of sponge, and the optimized loading of MWCNTs was determined to be 3.0%, with a water contact angle of 159.8°. The 3D superhydrophobic sponge exhibited high absorption capacity to a wide range of oils and organic solvents , up to 38–127 times of its own weight dependent on the variety of oil and organic solvent. After 10 recycles of repeative absorption, the loss of absorption capacity was as low as 0.9% per cycle. The 3D superhydrophobic sponge was also applied for continuous separation of spilled oil from water with a separation efficiency of 97%. Our approach could also be extended for coating other carbon materials on MS, including graphene and activated carbon. The resultant sponges were still superhydrophobic and exhibited high separation ability for immiscible oil/water mixture.
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ANALYTICAL BIOCHEMISTRY
·
2017
·
IF 2.334
Zhonghua Xue,Xiaofen Wang,Honghong Rao,Xiuhui Liu,Xiaoquan Lu
Many strategies have been explored for selectively and sensitively detecting cysteine in different samples. Here, a novel colorimetric sensor based on self-assembly nanostructures of Fe 3+ -H 2 O 2 /Tetramethylbenzidine system with dual-level logic gate function and colorimetric determination of cysteine were firstly explored. The proposed Fe 3+ -H 2 O 2 -TMB system provides a sensitive optical signal due to the selectively reductive ability of cysteine to the oxidized TMB and thus could be successfully applied to the construction of instant on-site visual detection method with a paper based test strip for cysteine determination in a sample solution as well as for a dual-level logic gate fabrication.
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JOURNAL OF FLUORESCENCE
·
2016
·Vol. 26
·期 3
·977-985
·
IF 1.601
Geng Tong-Mou,Wang Xie,Jiang Hui,Song Wan,Ni Ruo-Fan,Chen Jian,Wang Yu
An acrylic monomer bearing xanthene group, N-oxethyl acrylate-N′-rhodamine B hydrazide (ARBHE) was synthesized from N-hydroxyl ethyl-N′-rhodamine hydrazide (RBHE) and acryloyl chloride (Ac) in the presence of triethylamine in dry dichloromethane (CH 2 Cl 2 ) at room temperature. The synthesized ARBHE was identified by FTIR, 1 H NMR spectra and elementary analysis. Copolymer poly(AM-ARBHE) of ARBHE and AM was synthesized with thermal initiator by free radical precipitation polymerization and it was characterized by the method of FTIR and 1 H NMR. Its molecular weights (M η ) was 7.03 × 10 3 g mol −1 and the content of rhodamine units in the polymer chains was 1.44 % in mole fraction. The ability of the poly(AM-ARBHE) to detect different metal cations (Ag + , Ba 2+ , Cd 2+ Co 2+ , Cr 3+ , Cu 2+ , Co 2+ K + , La 3+ , Mg 2+ , Na + , Ni 2+ , Pb 2+ , Fe 2+ , Fe 3+ , Hg 2+ and Zn 2+ ) in water was investigated. Upon addition of Cr 3+ , Fe 3+ or Hg 2+ ions to the aqueous solution, visual color change and fluorescence enhancement were observed. Moreover, other metal ions did not induce obvious changes to the fluorescence spectra except to Fe 2+ . The detection limit of poly(AM-ARBHE) was less than 1 × 10 −11 M. The results suggest that this copolymer may offer potential as a polymeric sensor for Cr 3+ , Fe 3+ and Hg 2+ ions in water.
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