CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·275-282
·
IF 1.835
Liu Xiaonan,Zhang Youkui,Bian Liang,Li Jinshan
The adsorption of bovine serum albumin (BSA) protein is important for protein research but remains a great challenge. Here, the hydrothermal method and calcination in a hydrogen-argon mixed atmosphere were used to obtain ordered mono-crystalline magnetic Fe 3 O 4 nanorings with controllable size and uniform structure, which were applied to the adsorption of BSA protein. The results showed that the magnetic Fe 3 O 4 nanorings prepared have the advantages of good crystallinity, controllable morphology, and excellent magnetic response. The Fe 3 O 4 nanorings had an outer diameter of ~160–180 nm, inner diameter of ~80–110 nm, and height of 70 to ~110 nm. The amount of BSA adsorbed by magnetic Fe 3 O 4 nanorings increased with increasing protein concentration; when the concentration of BSA was ~2.75 mg·mL -1 the adsorption amount approached saturation. When the pH value of the solution was ~5, the Fe 3 O 4 nanorings absorption of BSA was greatest. With increasing adsorption time, the amount adsorbed increased gradually. Adsorption equilibrium was reached after 3 h. According to the formula, the saturated adsorption capacity of BSA per gram of magnetic Fe 3 O 4 nanorings was 325.2 mg.
.
研究领域:
生物化学
·
材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 20
·期 5
·679-688
·
IF 3.474
Huihui Chen,Mei Yang,Sha Tao,Guangwen Chen
A facile, template-free and easily scalable approach has been developed for the preparation of Co3O4 nanorings, which can be divided into two stages: (1) formation of CoOOH nanorings and (2) high-temperature calcination of CoOOH nanorings in air. The key step for the synthesis of Co3O4 nanorings is the formation of CoOOH nanorings, prepared by the oxidation of β-Co(OH)2 nanoplates with H2O2 under strong basic conditions. The plausible growth mechanism governing the formation of CoOOH nanorings was correlated with Ostwald ripening. It was found that the dosage of H2O2 played a vital role in the formation of CoOOH nanorings. To a large extent, other experimental variables including the H2O2 concentration, Co2+ concentration, the molar ratio of Co2+ to OH− and the reaction temperature did not affect the preparation of the CoOOH nanorings. Furthermore, the as-prepared Co3O4 nanorings exhibited superior activity in comparison with Co3O4 nanoplates and commercial Co3O4 towards the catalytic decomposition of H2O2. The apparent rate constant of the as-prepared Co3O4 nanorings was 0.38 min−1, which is 2.2 times the value of Co3O4 nanoplates.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaoqing Liu,Guangshe Li,Jinjiang Wu,Dan Zhang,Liping Li
Vanadium monoxide (VO) is a promising candidate as an anode for lithium-ion batteries due to its high theoretical capacity, low cost, and considerable electronic conductivity. Unfortunately, a large volume change during electrochemical processes obstructs its practical application. In this work, a composite of VO nanorings grown on a porous carbon architecture is prepared via a topochemical self-reduction approach. When used as an anode for lithium-ion batteries, improved redox kinetics from enhanced electronic conduction and the corresponding fast lithium-ion diffusion is observed to greatly promote the electrochemical performance of lithium-ion batteries. The resulting composite delivered a reversible capacity of 336 mA h g–1 after 400 cycles at 10 A g–1 with a capacity retention of 85%, owing to the synergistic effect of VO nanorings and porous carbon in alleviating volume changes that result in a long-term cycling ability at a high current density. At 20 A g–1, the composite anode exhibited a rate capability of 235 mA h g–1, superior to all VO-based electrodes reported in the literature. Furthermore, a full cell was first fabricated by employing VO@C-2 as the anode and LiFePO4 as the cathode, which exhibited a capacity of 213 mA h g–1 after 100 cycles at 0.1 A g–1, indicating the potential of VO as an anode for practical application.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 44
·6588-6593
·
IF 3.474
Yu Han,Wenxing Wang,Penglin Jiang,Yucong Yan,Hui Zhang,Deren Yang
Au nanorings are of particular interest in catalysis owing to their fascinating properties, however, it still remains a tremendous challenge to generate such hollow nanostructures with small size. Here, we report the synthesis of Au nanorings with an outer diameter of less than 20 nm by a seed-mediated approach with Pd nanoplates as seeds in the presence of Ag+ ions. The incorporation of Ag+ ions substantially slows down the reduction rate of the Au precursor through an underpotential deposition (UPD) process, leading to the formation of small Au nanoparticles. These small Au nanoparticles then coalesced into nanorings on small Pd nanoplates. The outer diameter of the Au nanorings is tuned by varying the size of the Pd nanoplates. The smallest Au nanorings are evaluated as catalysts towards the hydrogenation of 4-nitrophenol, showing substantially enhanced catalytic activity relative to the Au nanoparticles with the same size. This enhancement in the catalytic activity can be attributed to the unique structural features including the large specific surface areas, convenient accessibility of both interior and exterior surfaces for the reactants, and existence of highly active sites in the interior part.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Wenluan Gao,Qingli Xu,Zheyuan Wang,Miao Wang,Xiaona Ren,Gang Yuan,Qingfa Wang
To develop robust and highly active bifunctional electrocatalysts for electrochemical water splitting in acidic media is still a great challenge for proton exchange membrane (PEM) electrolyzer. Herein, a self-assembled IrCo x nanorings (NRs) with bracelet-like architecture is fabricated as a bifunctional high-efficient overall water splitting electrocatalyst by a facile, controllable and surfactant-free strategy. The unique nanoring architecture enriches in abundant homointerface and strong synergistic electronic interaction between Ir and Co. The optimized IrCo 0.14 NRs exhibits remarkable electrocatalytic performance with a low overpotential of 16 mV for hydrogen evolution reaction (HER) and 278 mV for oxygen evolution reaction (OER) at 10 mA cm −2 in 0.1 M HClO 4 , respectively, significantly outperforming the commercial Pt/C, Ir/C and reported Ir-based catalysts. As both anode and cathode, a cell voltage of only 1.53 V to reach 10 mA cm −2 is obtained for overall water splitting and no obvious activity loses after a long-term electrolysis for 14 h. Combined with a PV cell, this catalyst also shows excellent water splitting performance with a solar-to-hydrogen conversion efficiency of 12.8%. This work provides further insights on designing promising and efficient bifunctional electrocatalysts for clean energy electrochemical conversion in the future.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yiqian Lv,Yueqing Zheng,Honglin Zhu,Yinghao Wu
As a semiconductor material with a 2D-laminate structure, g-C 3 N 4 (bandwidth 2.7 eV) has a similar structure and excellent performance to graphene. However, high surface energy and photogenerated e–h recombination of g-C 3 N 4 seriously hinder its application in the field of marine anticorrosion and antifouling. To solve these problems, we synthesized the g-C 3 N 4 nanosheets decorated with ZnO nanoring via chemical etching technology. Whether the NR ZnO-CNNs have surface protection performance among the pure EP on the corrosion protection for metal substrate were investigated. The antifouling properties NR ZnO-CNNs hybrid were also estimated through photocatalytic bacterial and algae resistance tests. Combined with the electrochemical results, it was found that the impedance modulus of NR ZnO-CNNs/EP within 45 days showed two orders of magnitude higher than that of pure EP in the 3.5 wt% NaCl solution. Besides, Local electrochemical impedance spectroscopy (LEIS) further explored the anticorrosion behavior of NR ZnO-CNNs/EP coating, which indicated that the NR ZnO-CNNs/EP coating with a scratch maintained an excellent corrosion resistance between 0–24 h. Under the visible light conditions, the lifetime of photogenerated e–h was prolonged due to the formation of NR ZnO-CNNs heterojunction structure, it was observed that the antibacterial rate against Bacillus subtilis reached 100% within 8 h. An Antialgae test was performed on chlorella seawater solution, which indicated that 5 mg/mL of NR ZnO-CNNs hybrid could make chlorella sharply reduce within 4 days. Simultaneously, the corrosion protection and photocatalytic antifouling mechanisms of NR ZnO-CNNs were proposed, thus it provided a broader platform for the design of versatile marine protection materials.
研究领域:
材料科学
·
海洋工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Hui Zhang,Yiming Wang,Hua Zhong,Jie Li,Caifeng Ding
Gold-based nanomaterials are widely used in the field of photothermal therapy (PTT) of cancer cells because of the low cytotoxicity and excellent photothermal conversion efficiency upon near-infrared (NIR) light irradiation. Hollow gold nanoparticles exhibited enhanced interaction with light and surrounding media due to larger exposed surface than solid nanoparticles and can be used to develop sensitive NIR sensors in biomedicine. Here we designed an NIR light-controlled biosensing strategy that employs dual Pt@Au nanoring@DNA (PAD) probes for fluorescence imaging and targeted PTT of cancer cells. The probes had Au nanoring with Pt framework (Pt@AuNR) as a photosensitizer and functionalized double-stranded DNA (dsDNA) hybrids as a sensor. The cell-subtype-specific recognition and fluorescence imaging were controlled by NIR light irradiation through the dehybridization of dsDNA as a result of temperature elevation localized on the PAD probe. The targeted PTT of cancer cells was excellent under the control of NIR light due to the strong absorption of Pt@AuNRs in the NIR region. The majority of target tumor cells were killed under the photothermal effect after incubating with the dual PAD probes and receiving artificial laser irradiation. The dual PAD probe system successfully described NIR light-activated cancer cell diagnosis and therapy, including the activation of specific recognition, fluorescence imaging, and targeted PTT. This work has provided a promising platform on which NIR light-controlled targeted theranostic may be developed.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
DOI
Small
·
2015
·Vol. 11
·期 36
·4745-4752
·
IF 8.368
Yi Li,Wenxing Wang,Kaiyang Xia,Wenjun Zhang,Yingying Jiang,Yuewu Zeng,Hui Zhang,Chuanhong Jin,Ze Zhang,Deren Yang
Despite a few reports on the synthesis of ultrathin 2D nanosheets made of noble metals, it still remains a tremendous challenge to generate their ultrathin hollowed nanostructures, which are of particular interest in highly active catalysis due to their unique structural features. Here, the synthesis of ultrathin 2D Pd nanorings is reported with a hollow interior by selective epitaxial growth of Pd atoms on the periphery of the as-preformed Pd nanosheets in combination with oxidative etching. This approach can be extended to fabricate Pd-based bimetallic ultrathin nanorings such as Pd–Pt. The Pd nanorings exhibit substantially enhanced activity toward the hydrogenation of p -nitrophenol, which is 2.2 and 33.4 times higher than that of the Pd nanosheets and commercial Pd black, respectively. Significantly, the Pd nanorings are highly stable with only less than 11% loss in activity compared to 45.7% loss of the Pd nanosheets and 72.2% loss of the Pd black after ten cycles.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 24
·
IF 1.866
Sara Riaz,Wang Feng,Ather Farooq Khan,Mian Hasnain Nawaz
In this article, we detail the sonication-induced self-assembly of polymeric porphyrin and fullerenes into distinct nanorings in solution form. The formation of these trenchant superstructures was the result of the delicate choice of different assembly protocols, solvents, and polymeric tails associated with porphyrin and fullerene. In this study, the sonication supposedly directed the lateral aggregation into uniform ring formation. The sonication time was found to be the key parameter in ring formation. Furthermore, the flexibility of polymeric arms and electronic interactions of porphyrin–fullerene gave rise to synergistically enhanced molecular interactions, and this resulted in discrete morphologies. Key optical data, including the absorption maxima of the complexes, and microscopic studies attested to the nature and morphology of the self-assembled complexes. This introduction of polymeric arms and sonication protocols in the porphyrin self-assembly was expected to allow the easy formation of diverse morphologies. Because of the facile fabrication process and uniform morphology, the resulting composite architectures might show promising applications in drug-delivery and advance materials. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43537.
研究领域:
材料科学
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化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 106
·87132-87138
·
IF 3.84
Chao Li,Ying Lin,Feng Li,Linghui Zhu,Fanxu Meng,Dongming Sun,Jingran Zhou,Shengping Ruan
Hexagonal ZnO nanorings were synthesized using a one-step hydrothermal method and Au nanoparticles were decorated on the surface of the ZnO nanorings through a facile deposition process. The as-prepared ZnO nanorings showed a well-defined hexagonal shape with a width of 0.75–1.4 μm, a thickness of 0.17–0.33 μm and a hollow size of 0.2–1 μm. For the Au nanoparticle-decorated hexagonal ZnO nanorings (Au–ZnO nanorings), Au nanoparticles with a size of 3–10 nm were distributed discretely on the surface of the ZnO nanorings. The acetylene sensing performance was tested for the ZnO nanorings and Au–ZnO nanorings. The results indicated that the Au–ZnO nanorings showed a higher response (28 to 100 ppm acetylene), lower operating temperature (255 °C), faster response/recovery speed (less than 9 s and 5 s, respectively), and lower minimum detectable acetylene concentration (about 1 ppm). In addition, the mechanism for the enhanced acetylene-sensing performance of the Au–ZnO nanorings was discussed.
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Shuang Fu,Aimin Pang,Xiang Guo,Youling He,Shanliang Song,Jinyin Ge,Jiangao Li,Wei Li,Yu Xiong,Lei Wang,Dong Wang,Ben Zhong Tang
Supramolecular toroids have attracted continuous attention because of their fascinating topological structure and important role in biological systems. However, it still remains a great challenge to construct supramolecular functional toroids and clarify the formation mechanism. Herein, we develop a strategy to prepare supramolecular helical fluorescent nanotoroids by cooperative self-assembly of an amino acid and a dendritic amphiphile (AIE-den-1) with aggregation-induced emission characteristics. Mechanistic investigation on the basis of fluorescence and circular dichroism analyses suggests that the toroid formation can be driven by the interactions of AIE-den-1 with amino acid and goes through a topological morphology transformation from nanofibers to left-handed nanotoroids by means of a twist-fused-loop process.
研究领域:
超分子化学
·
生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
TALANTA
·
2025
·
IF 6.1
Rongjing Hu,Shilan Fu,Yongcong Zhou,Zhenyu Lin,Fengfu Fu,Yongqiang Dong
The current surface-enhanced Raman scattering (SERS) substrates typically feature a single energy level, posing challenges in coordinating electromagnetic enhancement (EM) and chemical enhancement (CM), thereby limiting the sensitive detection of numerous crucial target molecules. In this study, novel aggregated nanorings (a-NRs) hybridizing Ag, Au and AgCl are constructed as SERS substrates. On one hand, the obtained a-NRs exhibit robust localized surface plasmon resonance absorption, whose wavelength can be tuned to match three commonly used laser wavelengths (532, 633 and 785 nm) to gain strong EM effect. On the other hand, these materials possess the Fermi levels of Au nanoparticles and Au/Ag alloy, in addition to the valence band and conduction band of AgCl. The abundant energy levels of the obtained a-NRs facilitate increased charge transfer opportunities for molecules, leading to a strong CM effect. Therefore, the obtained a-NRs show ultra-high SERS sensitivity towards numerous molecules. Moreover, the unique chemical composition makes the obtained a-NRs have good long-term stability in terms of SERS activity. Besides providing high-performance SERS substrates, the valuable experience for coordinating EM and CM to construct highly active SERS substrate demonstrated in this work are expected to significantly advance the application of SERS.
研究领域:
材料科学
·
光谱学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）