CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiangling Tian,Zhijun Ma,Jianrong Qiu,Rongfei Wei
Optical fibers have been formed by replacing precursor glass core with precursor ceramic core, in which drawing process, the precursor ceramic melted to fill the space of the core region while the clad glass was softened. Nd 3+ doped LaNbO 4 nanocrystals were precipitated in the core after heat treatment. X-ray diffraction, Raman spectra, high-resolution transmission electron microscopy, electron paramagnetic resonance, optical microscope, and photoluminescence were used to characterize the obtained fiber. No crystallization, cracking, bubble, or undissolved substance is observed in the core region of precursor fiber. Nd 3+ doped LaNbO 4 nanocrystals are precipitated in the core region after thermal treatment. Under the pumping source of 808 nm, three emission bands located at ∼887 nm, ∼1064 nm, and ∼1337 nm are observed, which makes this GC fiber a promising material for the NIR fiber amplifier.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2020
·
IF 3.356
Juanjuan Zhao,Yujiao Sun,Yang Zhang,Bo-Tao Zhang,Meng Yin,Long Chen
Activated carbon supported iron (Fe-AC) was prepared as an efficient catalyst for activating persulfate (PS) to degrade amoxicillin (AMO). The complete degradation of AMO in Fe-AC/PS system was attained within 10 min. The AMO degradation efficiency increased as the initial catalyst dosage and PS concentration increased but was not affected by the initial pH. AMO degradation fitted the pseudo-first-order kinetic model, and the apparent activation energy was calculated to be 28.11 kJ ⋅ mol −1 using the Arrhenius Equation. Both hydroxyl radical and sulfate radical were identified during AMO degradation by electron paramagnetic resonance spectroscopy and radical scavenger tests. The surface-adsorbed hydroxyl radicals played significant roles in AMO degradation. In addition, tests using ADP1_recA_lux bioreporter were performed to assess the degrees to which the solutions containing degraded AMO were toxic. The Fe-AC/PS system markedly decreased microorganism growth inhibition and genotoxicity caused by the solution containing degraded AMO, providing important information for applying Fe-AC/PS technology to application.
研究领域:
环境科学
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化学工程
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水处理
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催化
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2026-2038
·
IF 9.6
Xu Bin,Jia Lu,Yang Hui,Wang Yue,Fan Si-Yu,Yuan Sai-Sai,Zhang Qi-Tao,Zhang Ming,Ohno Teruhisa
In this study, the truncated octahedral CeO 2 (CeO 2 -to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO 2 -to exposes composite {100} and {111} facets, while CeO 2 cubic (CeO 2 -c) and CeO 2 octahedral (CeO 2 -o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO 2 -to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH 3 CHO) degradation, in which CO 2 generation value reaches 1.78 and 7.97-times greater than that of CeO 2 -c and CeO 2 -o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O 2 − ) and holes (h + ) are the main reactive substances during the CH 3 CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO 2 -to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH 3 CHO degradation on CeO 2 -to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract
研究领域:
材料科学
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环境科学
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纳米技术
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物理化学
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催化
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Long Sun,Ting Du,Chao Hu,Juanni Chen,Jian Lu,Zhicheng Lu,Heyou Han
Carbon-based nanomaterials have been widely developed into innovative antimicrobial agents due to their advantages of high surface-to-volume ratio, extremely high mechanical strength, and distinct physicochemical properties. Here, the nanocomposite of graphene oxide/graphitic carbon nitride (GO/g-C3N4), a free-metal photocatalyst, was fabricated through sonication at room temperature and its antibacterial activity against Escherichia coli (E. coli) was investigated. The 100 μg/mL GO/g-C3N4 composite was found to kill 97.9% of E. coli after 120 min visible light irradiation, which was further confirmed by fluorescent-based cell membrane integrity assay. Additionally, the holes produced by photocatalysis were confirmed by electron spin resonance (ESR) spectra and trapping experiments to participate in photocatalytic sterilization as principal active species and were further verified by transmission electron microscopy (TEM) and scanning electron microscope (SEM) to lead to the distortion and rupture of cell membrane and finally cell death. Further photoluminescence (PL) spectra, cyclic voltammetry, photocurrent generation, and impedance spectroscopy (EIS) characterization revealed that the introduction of GO contributed to separate photogenerated electrons and prevents the electron–hole pairs of g-C3N4 from recombing to generate more h+, thus directly improving the bactericidal ability of GO/g-C3N4. Reusability assays indicated that the GO/g-C3N4 retained more than 90% of activity after four cycles of use. This study facilitates an in-depth understanding of the mechanism of visible light-driven disinfection and provides an ideal candidate sterilizing agent for treating microbial-contaminated water.
研究领域:
材料科学
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环境科学
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生物技术
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纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 27
·9440-9448
·
IF 7.059
Jiachen Wang,Kuikui Zhang,Jing Wang,Menghu Zhang,Yunlei Zhou,Jing Cheng,Desheng Kong
An intrinsically stretchable conductor with a natural deformability is a fundamental building component for stretchable and wearable electronics. The large variations of conductance upon mechanical deformations often lead to electronic instability at the system level. Here, an elastomeric nanocomposite mesh conductor is introduced, which exhibits a series of desirable properties including strain-invariant conductance, mechanical compliance, and excellent breathability. Selective laser ablation enables the facile procedure to create the mesh from a silver nanowire/thermoplastic polyurethane nanocomposite. The hollow mesh design effectively accommodates the strains to achieve stable conductance during tensile deformations. Demonstrations of wearable heaters and electromyogram sensors show the practical suitability of the nanocomposite mesh conductor for uses in epidermal electronic devices. The structural design and engineering strategy reported in this study represent a generic approach for the deterministic and versatile manipulation of intrinsically stretchable conductors.
研究领域:
材料科学
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纳米技术
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电子学
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可穿戴技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 2
·1-16
·
IF 2.6
Guo Liyun,Zhang Haichang,Hua Jing,Liu Jinhui
Cis-1,4 - polyisoprene latex (IRL) is the best alternative to natural rubber latex (NRL) because it is free from proteins and can avoid allergic reactions in the human body. Poor mechanical properties of IRL film are a major obstacle to replacing NRL. To address this issue, a novel strategy was developed by a simple one-pot method to prepare a composite latex introducing hexadecyltrimethylammonium bromide (CTAB) modified sodium montmorillonite (org-Mnt) into the IRL preparation process. The microstructures and morphology of the resulting org-Mnt were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and Energy Dispersive Spectrometer (EDS). In addition, the dispersion state of the org-Mnt in the composite latex and the morphology of the composite films were determined by transmission electron microscopy (TEM) and SEM. The properties of the composite latex were investigated. Crosslink density, thermogravimetric analysis (TGA), mechanical properties, and thermal oxygen aging properties of the composite latex films were also studied. Finally, the mechanism of org-Mnt reinforcement of IRL was described comprehensively. The results showed that the org-Mnt/IRL (1phr and 2phr) composite latexes had a stable state, excellent film-formation performance, and excellent mechanical properties. Compared with pure IRL films, the tensile strength of org-Mnt/IRL (2phr) composite films increased by 74%, and after thermal oxygen aging, property change rates of the tensile strength and elongation at break increased by 37.2% and 32.1%, respectively, which exceeded those of NRL. The current research provides an effective method for preparing high-performance composite films suitable for high-end medical applications.
研究领域:
高分子科学
·
材料工程
·
纳米复合材料
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胶体与界面科学
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生物医用材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Shitao Feng,An Zhang,Fengshou Wu,Xiaogang Luo,Juan Zhang
In this study, a novel core-shell structured magnetic metal-organic framework nanospheres (Fe 3 O 4 @PD@BA-Zr-MOF) were fabricated by in-situ growth of boronic acid-decorated porphyrin-based metal-organic frameworks on polydopamine (PD) functionalized Fe 3 O 4 nanospheres for highly efficient enrichment of cis -diol containing nucleosides by magnetic solid phase extraction (MSPE). PD as a molecular linker promotes the nucleation and crystal growth of boronic acid-decorated porphyrin-based metal-organic framework (BA-Zr-MOF), which was synthesized via a dual-ligand strategy by using Zr 4+ as a metal unit as well as meso-tetra (4-carboxylphenyl) porphyrin (TCPP) and 1, 4-phenylenebisboronic acid (BA) as dual organic ligands. It is worth noting that the nitrogen-rich skeleton of TCPP and abundant boric acid groups in MOF allows for effective and selective enrichment of cis -diol containing compounds by hydrophilic interaction and boron affinity. Also, Zr 4+ well assembled into the MOF is beneficial to extraction via metal oxide affinity interaction due to reversible covalent complex formation/dissociation between Zr and cis -diol compounds. The morphology, structure and saturation magnetization of Fe 3 O 4 @PD@BA-Zr-MOF were systematically characterized. The as-prepared adsorbent coupled with high performance liquid chromatography was used for analysis of four nucleosides including cytidine , uridine , guanosine , and adenosine in urine sample with the detection limits in range of 0.002–0.005 μg mL −1 and the quantitative limits in range of 0.008–0.018 μg mL −1 . The as-fabricated Fe 3 O 4 @PD@BA-Zr-MOF nanospheres shows high selectivity , low detection limit, excellent reusability and reproducibility for nucleosides enrichment. The large specific surface area and quick magnetic response performance endow the affinity magnetic nanospheres with outstanding enrichment capability for rapid extraction. The adsorbent of Fe 3 O 4 @PD@BA-Zr-MOF nanospheres has great potential for identification and analysis of trace cis -diol containing nucleosides in biological samples.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Haiyan Zheng,Ming Chen,Yusheng Sun,Baoqi Zuo
Wearable strain sensors based on conductive hydrogels have attracted much attention due to their great application potential in fields such as human motion and health monitoring. Under the guidance of application, the design of conductive hydrogels with multiple functions has been developed. However, due to the weakening or elimination of some properties of hydrogels by water molecules, the design of wearable sensors suitable for use in wet or underwater environments and with biosafety is still a challenge. In this paper, the conductive polymer polypyrrole (PPy) combined with silk fibroin (SF) and tannic acid (TA) were introduced into the same gel network by in situ polymerization, and the SF/TA@PPy conductive hydrogel was successfully constructed. The hydrogel has stretchability, skin compliance, antibacterial and biocompatibility properties. In air or underwater, SF/TA@PPy can perform self-healing of mechanical properties, electrical properties, and sensing properties without external stimulation. At the same time, the SF/TA@PPy showed excellent wet adhesion to various materials. It has a wide working range, high strain sensitivity and fast resistance response. It still has stable electrical performance after multiple stretching cycles. As a wearable strain sensor, the SF/TA@PPy can directly adhere to the surface of the human body without the aid of external objects. In addition, it can quickly perceive large strain body movements such as finger joints, wrist joints, elbow joints and knee joints. Changes in small-strain physiological signals such as smile, frown, cough and respiration can also be accurately captured. Body motion detection can be carried out not only in air but also in water. Based on stable electrical properties, SF/TA@PPy can achieve effective underwater information transmission by controlling body movement changes to express the Morse code.
研究领域:
材料科学
·
生物材料
·
可穿戴技术
·
生物医学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）