Small Methods
·
2022
·Vol. 7
·期 1
·2201266
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IF 15.367
Mingjun Nan,Min Wu,Yuqin Liu,Lin Qiao,Huamin Zhang,Xiangkun Ma
Aqueous manganese-based flow batteries (AMFBs) have attracted great attention due to the advantages of low cost and environmental friendliness. Extending the cycle life of AMFBs has long been a challenging theme. The titanium-manganese single-flow batteries (TMSFB) are promising due to their special structure and electrolyte composition. However, TMSFB with high areal capacity faces capacity decay for unknown reasons. In this work, the capacity decay mechanism (accumulation and growth of MnO 2 ) is clarified by a homemade in situ microscope system. Given that, a redox mediator of Fe 2+ /Fe 3+ is specially designed to boost the areal capacity of TMSFB without side reaction. The directional promoting principle of the Fe 2+ /Fe 3+ is elaborated in detail. Fe 2+ chemically reacts with the residual MnO 2 to form Fe 3+ , which is reduced to Fe 2+ by the electrochemical reaction. And then Fe 2+ continues reacting with MnO 2 until MnO 2 is consumed completely. As a result, the TMSFB with the areal capacity of ≈55 mA h cm −2 can stably operate at a current density of 40 mA cm −2 , which is the highest areal capacity reported in aqueous manganese-based batteries. This work provides a new strategy for boosting the capacity of manganese-based batteries, shedding light on the improvement of other deposition-type batteries.
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Nanomaterials
·
2022
·Vol. 12
·期 11
·1826
·
IF 5.719
Jiahui Zhang,Yan Jing,Peng Zhang,Benhua Xu
Herein, oxygen-doped g-C3N4quantum dots (OCNQDs) were fabricated through sintering and ultrasonic-assisted liquid-phase exfoliation methods. The obtained OCNQDs with uniform size show high crystalline quality, and the average diameter is 6.7 ± 0.5 nm. Furthermore, the OCNQDs display excellent fluorescence properties, good water solubility, and excellent photo stability. The OCNQDs as fluorescence probe show high sensitivity and selectivity to Fe3+ions. Furthermore, the fluorescent OCNQDs are applied for live cell imaging and Fe3+ions detecting in living cells with low cytotoxicity, good biocompatibility, and high permeability. Overall, the fluorescent OCNQDs fabricated in this work can be promising candidates for a range of chemical sensors and bioimaging applications.Keywords:oxygen-doped g-C3N4quantum dots;fluorescence;metal ion detection;bioimaging
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Polymers
·
2022
·Vol. 14
·期 10
·2025
·
IF 4.967
Tao Li,Yu-Jing Sheng,Xiao-Li Sun,Wen-Ming Wan,Yanru Liu,Qingrong Qian,Qinghua Chen
The isosteric replacement of C═C by B–N units in conjugated organic systems has recently attracted tremendous interest due to its desirable optical, electronic and sensory properties. Compared with BN-, NBN- and BNB-doped polycyclic aromatic hydrocarbons, NBN-embedded polymers are poised to expand the diversity and functionality of olefin polymers, but this new class of materials remain underexplored. Herein, a series of polymers with BNB-doped π-system as a pendant group were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization from NBN-containing vinyl monomers, which was prepared via intermolecular dehydration reaction between boronic acid and diamine moieties in one pot. Poly{2-(4-Vinylphenyl)-2,3-dihydro-1H-naphtho[1,8-de][1,3,2]diazaborinine} (P1), poly{N-(4-(1H-naphtho[1,8-de][1,3,2]diazaborinin-2(3H)-yl)phenyl)acrylamide} (P2) and poly{N-(4-(1H-benzo[d][1,3,2]diazaborol-2(3H)-yl)phenyl)acrylamide} (P3) were successfully synthesized. Their structure, photophysical properties and application in metal ion detection were investigated. Three polymers exhibit obvious solvatochromic fluorescence. As fluorescent sensors for the detection of Fe3+and Cr3+, P1 and P2 show excellent selectivity and sensitivity. The limit of detection (LOD) achieved by Fe3+is 7.30 nM, and the LOD achieved by Cr3+is 14.69 nM, which indicates the great potential of these NBN-embedded polymers as metal fluorescence sensors.Keywords:NBN-embedded polymers;boron-containing polymers;solvatochromic fluorescence;metal ion detection
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Long Wu,Wei Zeng,Bing Hu,Ting Wu,Min Zhou,Weihong Xie
Since pesticide residues in food have attracted increasing concern worldwide, it is crucial to develop rapid and sensitive analytical methods to detect pesticide residues and ensure food safety. In this work, via the biotin-streptavidin (SA) recognition system, we constructed a magnetic relaxation switching (MRS) immunosensor for sensitive detection of chlorpyrifos (CPF). With a competitive immunoassay mode, H 2 O 2 and Fe 2+ were firstly optimized as the reaction substrates. Wherein, horseradish peroxidase (HRP) acted as enzyme label to catalyze H 2 O 2 and mediated the conversion of Fe 2+ /Fe 3+ . By introducing Fe 2+ /Fe 3+ interconversion as MRS signal output, CPF was detected by the immunoreaction induced variations of the transverse relaxation time (ΔT 2 ). The proposed MRS immunosensor exhibited a detection linear range from 0.01 to 1000 ng mL −1 (R 2 = 0.9916), with the limit of detection (LOD) of 6 pg mL −1 (3S/M, n = 3). As a proof-of-concept, CPF was easily detected among five different pesticides at a low concentration level (0.1 ng mL −1 ), as well as in real samples (apple, tea, and lettuce) with recoveries of 80.70–115.30%. Besides, the sensor can realize one step of “separation and detection” towards CPF with the aid of magnetic nanoparticles , which demonstrate its promising potential for pesticide residue detection in food samples and environment.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Yangmei Wu,Zhiyuan Meng,Fei Zhao,Shifa Wang,Zhonglong Wang,Yiqin Yang
Fe 3+ is the most abundant essential transition metal ion in the human body, plays a vital role in biological and environmental systems. Ethyl cellulose is one of the derivatives of cellulose. Herein, a novel ethylcellulose fluorescent probe EC-HPCB for detecting Fe 3+ was prepared by grafting a flavonol derivative as both fluorophore and selective recognition group. The probe exhibited a highly specific “turn-off” fluorescence response to Fe 3+ , and the fluorescence color changed from yellow to colorless in the presence of Fe 3+ . The detection limit of EC-HPCB for Fe 3+ was 2.65 × 10 −7 mol/L, and the response time was as quick as 2 min. The detection mechanism was confirmed by 1 H NMR and DFT calculations. Based on the good solubility and processability in organic solvent, EC-HPCB was made into coating and film with favorable fluorescent performances. Furthermore, EC-HPCB probe was successfully applied to monitor Fe 3+ in real water samples, and the EC-HPCB -loaded filter paper provided a solid-state platform for detecting Fe 3+ by naked eye and fluorescence method.
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RSC Advances
·
2022
·Vol. 12
·期 36
·23215-23220
·
IF 4.036
Mingxin Luo,Bo Sun,Chen Zhou,Qingqing Pan,Yue Hou,Huan Zhang,Jing Sun,Chenyang Zou
In this research, a novel selective and sensitive fluorescent sensor for detecting Fe3+ was designed and synthesized; it revealed an obvious fluorescence quenching effect upon addition of Fe3+, and possessed the quantitative analysis ability on account of the formation of a 1 : 1 metal–ligand complex. Furthermore, the density functional theory calculations were utilized to study the molecular orbitals as well as the spatial structure. Simultaneously, the cell experiments and zebra fish experiments verified the application value of the sensor in the biological field.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yajun Chen,Di Wang,Alfred Mensaha,Qingqing Wang,Yibing Cai,Qufu Wei
Multifunctional hydrogels with transparency, ultraviolet (UV)-blocking, stretchable, self-healing, adhesive, antioxidant and antibacterial properties are promising materials for biomedical and relevant applications. However, preparation of these hydrogels at ambient environment without stimuli is still a challenge. Here, a series of hydrogels possessing ultrashort gelation time (~30 s) at room or cold temperature were fabricated based on self-catalytic Fe 3+ /Tannic acid-cellulose nanofiber (Fe 3+ /TA-CNF). Fe 3+ /TA-CNF formed stable redox pairs to activate ammonium persulfate (initiator), generating abundant free radicals to trigger the ultrafast polymerization of acrylic acid (AA). To improve the antibacterial ability of hydrogel, a bilayer hydrogel composite (NF@HG) composed of tetracycline hydrochloride (TH)-loaded electrospun nanofibers and hydrogel layer was fabricated via a mild casting method. The NF@HG exhibited enhanced antibacterial ability and the sustained release of TH can provide long-term antibacterial activity . Besides, cell viability results demonstrated that NF@HG was non-cytotoxic. Taken together, this strategy based on self-catalytic Fe 3+ /TA-CNF system may inspire new aspects on fast and economical preparation of multifunctional hydrogels or composites, which have attractive industrial applications for biomedical materials .
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Analytical Methods
·
2021
·Vol. 13
·期 37
·4246-4255
·
IF 2.896
Xiaofeng Li,Yuejing Bao,Xiaorui Dong,Lihong Shi,Shaomin Shuang
Dual-excitation and dual-emission carbon dots (CDs) have been prepared by simple one-step hydrothermal treatment of p-phenylenediamine and 5-aminosalicylic acid. The as-prepared CDs emit bright green fluorescence under excitation at 320–400 nm and bright orange fluorescence under excitation at 490–560 nm. Interestingly, the CDs can be employed as a dual-excitation and dual-emission fluorescent probe for Fe3+ detection in aqueous solution and living cells. Furthermore, the obtained CDs can function as a promising dual-excitation and dual-emission temperature sensor. Additionally, the CDs can be utilized for lysosomal targeting.
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Weisai Liu,Dapeng Li,Fei Wang,Xiaoyi Chen,Xuquan Wang,Yang Tian
A lanthanide metal-organic framework, {[Tb(FDA) 1.5 (DMF)]·DMF} n (Tb-FDA) was designed and prepared by mixing Tb 3+ and 2,5-furandicarboxylic acid (H 2 FDA) under solvothermal condition. The crystal structure of the complex was determined by single-crystal X-ray diffraction. The thermal stability and the luminescence properties of Tb-FDA were studied. The detection of organic molecules and cations and the interference of other analytes were considered and investigated in detail, revealing the excellent performance of Tb-FDA for sensing nitrobenzene (NB) and Fe 3+ with high efficiency, sensitivity and chemical stability. In addition, the sensing function possesses selectivity even with the existence of other analogous interfering substances. The mechanism of fluorescence quenching with NB and Fe 3+ was also given in this work.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xin Zhang,Lishan Chen,Chao Zhang,Liqiong Liao
Light-driven hydrogel actuators show potential applications because their spatiotemporal precision and contact-free manner, especially for near-infrared light (NIR), can be focused on a specific area, which possesses tunable intensity and strong penetrability. Herein, we propose a novel NIR-responsive hydrogel actuator incorporating Fe3+/tannic acid (Fe3+/TA) as a photothermal transducer into the poly(N-isopropylacrylamide) (PNIPAAm) hydrogel via photo-cross-linking and subsequent immersion in FeCl3 solution. TA contains abundant pyrogallol and catechol groups, which can be linked to PNIPAAm through hydrogen bonds during in situ polymerization; moreover, as a mediator, TA can form metal-phenolic networks with Fe3+ via the coordination between catechol and metal ions, endowing the PNIPAAm gel with enhanced mechanical properties as well as NIR-responsive photothermal effect. We demonstrated that introduction of Fe3+/TA maintained the volume phase transition temperature of the hydrogel around 32 °C and guaranteed its deformation behaviors upon NIR irradiation. Furthermore, a higher concentration level of BIS and Fe3+ were verified to facilitate a stronger photothermal capacity of the hydrogels. Therefore, under NIR irradiation, Fe3+/TA within the hydrogel converted NIR light into heat, and the local high temperature in the irradiated region would cause the petals of the “snowflake”-shaped hydrogel to bend upward perpendicular to the horizontal plane within 1 min, possessing excellent repeatability. This study puts forward a new idea of preparing NIR-responsive hydrogel actuators based on Fe3+/TA, which show promising application in the fields of biomimetic devices, flowing control, and soft robotics.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·19-29
·
IF 0
Liu Zhong-gang,Xiao Meng,Yang Rong-zhe,Zhou Qiao-qiao,Ye Hui-fen,Yi Chang-qing
This work reports on a smartphone-based quantitative POCT system which consists of a paper-based microarray chip, a homemade LEGO dark-box, and a smartphone installed with custom-designed FChip-APP, for on-site quantitation of Fe 3+ , Vitamin 12 (VB 12 ), and folic acid (FA). Collection and automatic analysis of fluorescence turn-off response of three kinds of fluorescent nanoprobes which are coated onto filter papers by a smartphone-based device is the principle behind this study. The POCT system exhibits good analytical performance for multiplexed analysis of Fe 3+ , VB 12 and FA with a wide linear range (Fe 3+ , 1.0–14.0 μg mL −1 ( R 2 = 0.983); VB 12 , 1.35–40.0 μg mL −1 ( R 2 = 0.991); FA, 2.0–26.0 μg mL −1 ( R 2 = 0.994)) and low detection limit (Fe 3+ , 0.35 μg mL −1 ; VB 12 , 0.47 μg mL −1 ; FA, 0.56 μg mL −1 ). The cost and weight of the whole system are ~ $220 and ~ 600 g per set, highlighting its cost-effectiveness and portability. The simple operation procedures and user-friendly interface of the FChip-APP validate the ease-of-use feature of the reported system. This versatile smartphone-based quantitative POCT system provides a cost-effective and easy-of-use method for screening the context-specific causes of anemia and thus its effective interventions in the future, especially in resource-limited areas.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Yan-Qin Wang,Yu Zhu,Jing-Hui Wang,Xiao-Na Li,Xiao-Gang Wu,Yi-Xian Qin,Wei-Yi Chen
Recently, artificial intelligence has driven the development of shape memory hydrogels (SMHs) with complicated environmental sensitive abilities. However, current SMHs possess fundamental limitations in terms of their responsive performance and mechanical properties , which severely limits their practical applications. Herein, a triple-network composite hydrogel with Fe 3+ , NIR light, and thermal responsive abilities is fabricated and developed as multi-SMHs, named as PDA/CMC-Fe 3+ /PVA hydrogel. In this hydrogel system, the interpenetrating triple network are formed by chemically-physically co-crosslinked polyvinyl alcohol (PVA) networks, and physically crosslinked carboxymethyl cellulose (CMC)-Fe 3+ network. In addition, polydopamine (PDA), which is introduced into the hydrogel system by in-situ polymerization way, could not only serve as an energy converter to endow the hydrogel with NIR-based responsive ability, but also enhance its mechanical strength . Remarkably, the as-prepared PDA/CMC-Fe 3+ /PVA hydrogels with the optimized compositions exhibit relatively excellent mechanical properties (tensile strength = 163.48 ± 10.42 kPa, elastic modulus = 45.42 ± 3.96 kPa, toughness = 165.02 ± 7.01 kJ/m 3 ) due to the synergistic effect of the triple-network and PDA doping. Moreover, the composition of the hydrogel is optimized to realize a stable temporary shape and rapid recovery to the permanent shape, which is controlled by Fe 3+ , NIR irradiation, and thermal stimulus. The resultant hydrogels exhibit not only multi-stimulus responsive abilities, but also programmable multi-shape memory properties. The versatile shape memory properties endow potential for the materials to be used in the field of artificial intelligence.
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