CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jaures Syntyche Ndzila,Zhengmao Ye,Guojian Jing,Xiaolei Lu,Jiaming Wu,Jinpu Zhang,Shuxian Wang,Xin Cheng
Sr 4 Al 6 SO 16 is a kind of anhydrous sulfoaluminate that belongs to the sodalite family. In this paper, we demonstrate the effect of Fe 3+ ions addition on the hydration properties of two polymorphs of Sr 4 Al 6 SO 16 (namely pure orthorhombic and cubic). In solid-state reaction of orthorhombic Sr 4 Al 6 SO 16 , excessive 5 wt% SrSO 4 was used to compensate for the loss of sulfur. Results indicate that the hydration rate of cubic phase is faster than that of orthorhombic phase at early stage, but the heat release of the latter is more concentrated. The reason why the cubic phase has a faster earlier hydration kinetics may be due to the incorporation of Fe 3+ ions and the formation of SrFe 12 O 19 impurity phase, which introduce the defects in the structure, activate the crystal lattice , and increase the hydration activity. Both polymorphs react with water to form the reaction products first, and then no crystalline phase hydration product was precipitated after 72 h. In contrary to the XRD , amorphous AH 3 was clearly detected in TGA analysis in hydrated samples, probably due to poor crystallinity which cannot be detected by XRD. In addition, both polymorphs contain a lot of impurity phases, and their amounts are calculated using the Rietveld refinement method. Moreover, the addition of Fe 3+ ions is not only beneficial to adjust the cubic phase content, but also facilitates the relative particle growth. This work provides a useful platform for employing the Fe 3+ ions to regulate the hydration properties of Sr 4 Al 6 SO 16 .
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Haiyang Zhang,Hongyan Zhang,Jianping Man,Chu Chen
A humidity sensor with high performance based on Fe 3+ ions doped with SnO 2 (Fe/SnO 2 ) was synthesized by hydrothermal method and its mechanism was studied by the first principle based on density functional theory . Experimental results show that doping Fe 3+ ions can effectively improve the performance of SnO 2 humidity sensor. Compared with SnO 2 , the resistance of Fe/SnO 2 humidity sensor increases from 4.5 to 5.5 orders of magnitude, the humidity hysteresis error decreases from 42.4% to 3.8% and the response/recovery time changes from 11 s/48 s–10 s/8 s. Calculations show that Fe 3+ ions can enhance the chemical and physical adsorption energy , improving the sensitivity and linearity and reducing the hysteresis error and recovery time of SnO 2 , respectively. Moreover, a simple circuit for respiratory detection was designed based on Fe/SnO 2 , and the number of LED lights can distinguish different breathing states through resistance changes of the Fe/SnO 2 humidity sensor. This study indicate Fe / SnO 2 humidity sensor can be used in non-contact and visual breath detection, which has potential applications in preventing respiratory disease.
研究领域:
材料科学
·
传感器技术
·
医学应用
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 48
·51601
·
IF 3.125
Qianru Xu,Yaqi Zhang,Ruquan Zhang,Yongzhen Tao
Polyelectrolyte hydrogels with spinnability and electroresponsive were prepared from xanthan gum (XG) and gelatin. Oscillatory rheological measurements were utilized to explore mechanical properties and thermal stability of the resultant XG-Gelatin5 hydrogels. The XG-Gelatin5 hydrogels possessed higher strength and larger critical strain than these of the XG hydrogels, demonstrating existence of synergistic interactions. The XG-Gelatin5 hydrogels were stable in temperature range of 20–60°C, and gradually release drug with controlled manner in neutral and acid medium at 37°C. The self-recoverable and thixotropic XG-Gelatin5 hydrogels were extruded to form hydrogel fibers, and the dried hydrogel fibers rapidly bend towards cathode under applied voltage. Long hydrogel fibers were harvested with enhancement by Fe 3+ ions, and were weaved and braided to obtain hydrogel fiber constructs. The XG-Gelatin5 hydrogel fibers with electroresponsive and controlled drug release possess potential applications in biomaterials, tissue engineering, and drug carrier fields.
研究领域:
生物材料
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组织工程
·
药剂学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Wenlong Pan,Lin Xu,Samuel C. Lamont,Yifan Zhang,Jianning Ding,Franck J. Vernerey
We developed a multifunctional wearable sensor that can monitor temperature and take anisotropic strain measurements in real time. The material used in this study consisted of covalently cross-linked N-isopropylacrylamide (NIPAM), Ti3C2Tx MXene nanosheets, and Nanoclay particles. The conductivity of the material was then significantly improved (up to 4.762 S/m) by the addition of Fe3+ ions, which interact with the surface of MXene nanosheets. Moreover, the secondary physical networks created by the nanoclay particles, MXene, and Fe3+ ions provided energy dissipation and improved the critical strain and toughness by 75 and 250%, respectively. After incorporating the hydrogel into a flexible sensor, we discovered and characterized a unique anisotropic resistance when taking measurements at different angles with respect to loading. The developed sensor has great strain sensitivity (gauge factor of 1.28), a fast response time (120 ms), and a broad working strain range (≈ 400%), thus, illustrating promise as a versatile sensor for human signal monitoring.
研究领域:
材料科学
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生物医学工程
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xin Mao,Nuanyuan Xu,Xinyu Shi,Hui Wen,Changkun Liu
Nanofiltration (NF) is commonly recognized as one of the effective technologies for the separation of magnesium (Mg 2+ ) and lithium (Li + ) from salt-lake brines. Charge repulsion and size exclusion effects often play an important role, whose functions primarily occur at the top surface and the matrix, respectively, of the skin layer. In this study, a novel nanofiltration (NF) membrane is prepared that integrates both size exclusion and charge repulsion effects into the matrix of the skin layer for enhanced Mg 2+ /Li + separation. With the surface-modified hydrophilic polyethylene (PE) membrane as the supporting layer, the prepared NF membrane successfully incorporated Fe 3+ ions into the matrix of the skin layer during the interfacial polymerization (IP). Fe 3+ ions which chelate with amine groups of PEI (aqueous-phase monomers during IP) ensure abundant positive charges within the matrix of the skin layer, providing good hydrophilicity and sustained electrostatic repulsive force against the transmembrane transport of Mg 2+ , and thus the enhanced rejection. Results exhibited a remarkable 92.6 % rejection rate for MgCl 2 and a higher water permeance of 22 LMH/bar, which is 1.57 times greater than that of the traditional PEI-TMC membranes. The nanofiltration process effectively reduced the Mg 2+ /Li + ratio from 50 in the feed to 5.4 in the permeate solution. It is also interesting to find that although the pore size of the skin layer (0.53 nm in radius) exceeds both the hydrated radii of Mg 2+ and Li + , the positive charges within the matrix of the skin layer still provide good selective separation performance, thus effectively breaking the trade-off of permeability and selectivity. This study offers a fresh perspective on the preparation of nanofiltration membranes by systematically exploring the potential of integration of charge repulsion and size exclusion effects into one location, i.e., the matrix of the skin layer for enhanced Mg 2+ /Li + separation performance.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1031-1034
·
IF 3.925
Hao Guo,Yinsheng Liu,Ning Wu,Liping Peng,Xiaoqin Wei,Zongyan Lu,Zhiguo Yu,Wu Yang
A triazine-based fluorescent COF (MaTa-COF) was synthesized from inexpensive reactants. The obtained MaTa-COF has a large BET-specific surface area of 621.15 m2 g−1 and can be used as a highly sensitive Fe3+ fluorescent probe with a wide linear range of 0–250 μM and a low detection limit of 6.18 × 10−2 μM (Ksv = 2.34 × 108 M−1). Furthermore, the probe presented a good recyclability performance.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ping Chen,Nengli Dai
Detection of Fe 3+ ions is of paramount importance for environmental protection and human health. Herein, we reported a highly selective and sensitive fluorescence probe for the quantification of Fe 3+ ions in aqueous solution with Eu 3+ /SnO 2 nanocrystals co-doped silica glasses as the sensing unit. Due to the high stability of silica glasses and their efficient protection for emitting centers, the probe has good recyclability and can be applied in real water environment, indicating its potential for on-site sensing. The detection limit of Fe 3+ ions is 7.54 nmol/L. Experiments were carried out to verify that the probe shows excellent cross interference with other metal ions. The detecting mechanism can be ascribed to the excitation/emission absorption and energy transfer of Fe 3+ ions. Our work paves a novel way of semiconductor oxide nanocrystals for applications in optoelectronics .
研究领域:
环境科学
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 24
·3582-3591
·
IF 5.582
Liulong Guo,Hongxia Yan,Lirong Yan,Lihua Bai,Song Niu,Yan Zhao
Hyperbranched polysiloxanes (HBPSi) have received widespread attention as emerging non-traditional fluorescent polymers. However, they have some drawbacks such as inadequate emission intensity and poor water solubility, which limit their further application in medicine and optoelectronic devices. In this study, a kind of novel HBPSi containing carbon dots (HBPSi-CDs) was prepared by a facile “one step” hydrothermal treatment method. Surprisingly, the synthesized HBPSi-CDs could emit near white light with the CIE coordinates of (0.301, 0.333) via mixing dual emission at 414 and 532 nm when the excitation wavelength was 340 nm. The experimental results show that the 414 nm emission originates from the HBPSi skeleton structure, and the 532 nm emission comes from the carbon dot structure excited with 414 nm light. In addition, HBPSi-CDs shows good water solubility and highly selective quenching to Fe3+ ions. Therefore, HBPSi-CDs shows promising applications in white organic light-emitting diodes (OLEDs) and fluorescent probes.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jun-jie Li,Xian-feng Wang,Dan-qun Huo,Chang-jun Hou,Huan-bao Fa,Mei Yang,Liang Zhang
Direct detection of Fe 3+ ions is of significant importance in view of both clinical and environmental applications. In the present study, we presented the construction of a paper-based colorimetric sensor by alternative modification of commercial cellulose paper with TiO 2 membrane as intermediate layer, hydrophobic/hydrophilic coating to obtain uniform diffusion, and decoration of –NH 2 and –SH groups for gold nanoparticles (AuNPs) immobilization. After optimization of fabrication and detection conditions, the colorimetric sensor showed a linear concentration-dependent colorimetric response (ΔG) in the presence of Fe 3+ concentrations ranging from 1.0 to 37 μM (R 2 > 0.98). The detection limit was calculated to be 0.85 μM (3δ) with good selectivity. Besides, the sensor also showed high resistance to AuNPs leaking in aqueous solutions, and demonstrated consistent measurement of Fe 3+ in serum samples. Those results suggested that as-prepared sensor strip is potential useful for Fe 3+ ion determination in clinical and environmental samples.
研究领域:
分析化学
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环境科学
·
医学诊断
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Pei Shuchen,Cai Shaoyu,Yan Kangli,Zhou Jinjing,Luo Kang,Chen Xinan
In this study, a simple and efficient method for synthesizing nitrogen-doped carbon quantum dots (N-CQDs) has been developed through a one-step hydrothermal process using hedyotis diffusa willd. The morphology, chemical composition, and optical properties of the resulting N-CQDs were thoroughly characterized. The synthesized N-CQDs exhibited a spherical shape with an average particle size of 4.32 nm, and the crystal lattice spacing was determined to be 0.17 nm. Notably, the N-CQDs demonstrated a significant fluorescence quenching effect in the presence of Fe 3 ⁺ ions, exhibiting high selectivity and sensitivity. The detection limit for Fe 3 ⁺ ions was found to be 6.62 × 10⁻ 3 μmol/L within a linear range of 0.01–0.1 μmol/L. Furthermore, the N-CQDs displayed significant antimicrobial activity against both Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) bacteria, with minimum inhibitory concentration (MIC) values of 0.055 mg/mL and 0.038 mg/mL, respectively. These findings suggest that the N-CQDs can serve as an effective fluorescent sensor and a promising antibacterial agent. This work provides a new strategy for the preparation of N-CQDs from natural plant sources, highlighting their potential applications as both fluorescent sensors and antimicrobial agents.
研究领域:
材料科学
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生物医学
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环境科学
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产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2020
·Vol. 35
·期 6
·870-876
·
IF 1.855
Yong Ran,Shaoyu Wang,Qianye Yin,Aoli Wen,Xiaoxiao Peng,Yunfei Long,Shu Chen
Water-soluble carbon dots (CDs) were synthesized using a one-step hydrothermal treatment of chloroplast dispersions extracted from fresh leaves as a green carbon source. The CD solution showed an emission peak centred at 445 nm when excited at 300 nm. The synthesized CDs were uniform and monodispersed with an average size of 5.6 nm. When adding ferric(III) ions (Fe 3+ ) to the solution of the original CDs, the fluorescence intensity decreased significantly. Based on the linear relationship between fluorescence intensity and concentration of Fe 3+ ions, an effective method for rapid, sensitive and selective Fe 3+ sensing in aqueous solution could be established. Under optimum conditions, the extent of the fluorescence quenching of prepared CDs strongly depended on the Fe 3+ ions over a wide concentration range 1.0–100.0 μM with a detection limit (3σ/k) of 0.3 μM. Furthermore, the quantitative determination of Fe 3+ ions in environmental water samples was realized.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 25
·期 6
·1587-1595
·
IF 1.858
Shen Yu,Wang Fumin,Liu Wei,Zhang Xubin
A series of Fe 3+ containing catalysts were synthesized using ion-exchange technique over hierarchically porous ZSM-5 (M-ZSM-5) and micro-mesoporous composite ZSM-5/MCM-41 (ZSM-5/MCM-41), respectively. The prepared catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, N 2 adsorption–desorption, UV–Vis spectroscopy, temperature programmed reduction and inductively coupled plasma-optical emission spectroscopy. The characterization results exhibit that the hierarchically porous ZSM-5 was synthesized with intracrystalline mesopores, while the micro-mesoporous composite ZSM-5/MCM-41 was prepared with the well-ordered mesopores. Furthermore, the results also prove that the existence of iron in the catalysts was mainly presented in the form of Fe 3+ ions. Catalytic performances of the samples for phenol hydroxylation were compared by using H 2 O 2 as oxidant. Under the optimized conditions, Fe 3+ ion-exchanged M-ZSM-5 (Fe-M-ZSM-5) shows that a phenol conversion of 42.3% obtained with 92.5% selectivity to dihydroxybenzenes, whereas Fe 3+ ion-exchanged ZSM-5/MCM-41 (Fe-ZSM-5/MCM-41) give 46.2% phenol conversion and 90.1% dihydroxybenzenes selectivity, which are all better than most reported results. The recyclability tests show that Fe-ZSM-5/MCM-41 with ordered mesoporous structure and bigger surface area has better anti-deactivation performance than Fe-M-ZSM-5. The excellent catalytic performances were due to the improved diffusion performance with newly created mesopores and the highly active Fe 3+ species obtained by ion-exchange technique.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）