Nanoscale
·
2017
·Vol. 9
·期 43
·16645-16651
·
IF 7.367
Guangchao Zheng,Zhuwen Chen,Kadir Sentosun,Ignacio Pérez-Juste,Sara Bals,Luis M. Liz-Marzán,Isabel Pastoriza-Santos,Jorge Pérez-Juste,Mei Hong
Shape control in metal–organic frameworks still remains a challenge. We propose a strategy based on the capping agent modulator method to control the shape of ZIF-8 nanocrystals. This approach requires the use of a surfactant, cetyltrimethylammonium bromide (CTAB), and a second capping agent, tris(hydroxymethyl)aminomethane (TRIS), to obtain ZIF-8 nanocrystals with morphology control in aqueous media. Semiempirical computational simulations suggest that both shape-inducing agents adsorb onto different surface facets of ZIF-8, thereby slowing down their crystal growth rates. While CTAB molecules preferentially adsorb onto the {100} facets, leading to ZIF-8 particles with cubic morphology, TRIS preferentially stabilizes the {111} facets, inducing the formation of octahedral crystals. Interestingly, the presence of both capping agents leads to nanocrystals with irregular shapes and higher index facets, such as hexapods and burr puzzles. Additionally, the combination of ZIF-8 nanocrystals with other materials is expected to impart additional properties due to the hybrid nature of the resulting nanocomposites. In the present case, the presence of CTAB and TRIS molecules as capping agents facilitates the synthesis of metal nanoparticle@ZIF-8 nanocomposites, due to synergistic effects which could be of use in a number of applications such as catalysis, gas sensing and storage.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
FREE RADICAL BIOLOGY AND MEDICINE
·
2020
·
IF 6.17
Yao-Dan Liang,Qian Liu,Ming-Hui Du,Zhen Liu,Si-Min Yao,Pei-Pei Zheng,Yu-Hao Wan,Ning Sun,Ying-Ying Li,Jun-Peng Liu,Yao Luo,Jian-Ping Cai,Jie-Fu Yang,Hua Wang
The diagnosis of frailty is usually subjective, which calls for objective biomarkers in clinical medicine . 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxodGsn) and 8-oxo-7, 8-dihydroguanosine (8-oxoGsn) in urine are two aging biomarkers that have not been explored deeply in cases of frailty. A total of 508 elderly patients with cardiovascular disease (mean age 75.0 ± 6.5 years, 50.8% males) were enrolled consecutively. Frailty was assessed by the Fried phenotype (robust: 0 score; pre-frail: 1–2 scores; frail: 3–5 scores). The concentrations of 8-oxoGsn and 8-oxodGsn in urine were measured by improved ultra-high-performance liquid chromatography-mass spectrometry (UPLC-MS/MS). Urinary creatinine (Cre) was tested to correct the 8-oxoGsn and 8-oxodGsn levels. According to the Fried phenotype score, the proportions of robust, pre-frail, and frail subjects were 20.5% (104/508), 53.9% (274/508), and 25.6% (130/508), respectively. The urinary 8-oxoGsn/Cre (P < 0.001) differed significantly among these 3 groups, but the urinary 8-oxodGsn/Cre (P = 0.600) showed no marked difference. Univariate and multivariate logistic regression showed that the age (odds ratio [OR] = 1.090, P < 0.001), systolic blood pressure (OR = 0.981, P = 0.008), 8-oxoGsn/Cre (OR = 1.203, P = 0.007), hemoglobin (OR = 0.980, P = 0.007), and sodium (OR = 0.915, P = 0.044) were independently associated with frailty. The sensitivity and specificity to identify frailty were 53.08% and 71.96%, respectively, for 8-oxoGsn/Cre at the optimal cut-off value of 3.879 μmol/mol according to the maximal Youden index . Urinary 8-oxoGsn, as a recognized biomarker of RNA oxidation , is independently associated with frailty in elderly patients with cardiovascular disease. However, the urinary 8-oxodGsn shows no obvious correlation with frailty. To obtain a better diagnostic performance for frailty, more biomarkers from different pathophysiological pathways should be explored in the future.
研究领域:
老年医学
·
临床医学
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xinning Yu,Dejun Xu,Xintong Jiang,Jun Zhang,Zhangsong Ni,Mao Wang
The development of photocatalysts with broad-spectrum response and efficient electron transfer yet remains a great challenge. Herein, we report a systematic research on the thermal oxidation mechanism of ZIF-8 and its promotion effects on photocatalytic performance. The activation energy E of organic ligands decomposition during ZIF-8 thermal oxidation was calculated to be 103.7 kJ/mol by Kissinger-Akahira-Sunose (KAS) model. The wurtzite ZnO crystal and oxidizing functional groups (H N C O, C O, etc.) formed in oxidized ZIF-8 were crucial to the superior photocatalytic performance. In particular, O350/ZIF-8 had the broadest optical absorption band (∼750 nm) and largest photocurrent density, which exhibited the highest photocatalytic activity of methylene blue (MB) with rate constant k of 0.0374 min −1 . The photogenerated ·O 2 − and ·OH radicals were found to react as main oxygen species in photocatalytic reaction. Taken together, this study not only offered a simple method to prepare ZIF-8 based photocatalyst with high activity and stability, but also provided guidance for the efficient photocatalytic degradation of organic compounds in wastewater.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Lulu Shi,Zhu Shu,Kai Wang,Jun Zhou,Tiantian Li
Herein, we report a solvent-free self-templating strategy for rapid synthesis of nanoscale hierarchically porous zeolitic imidazolate framework-8 (HP-ZIF-8) with micro-, meso-, and macropores. ZIF-8 crystals were produced in situ on ZnO nanoparticles via vapor deposition of 2-methylimidazole, and hierarchical nanopores were obtained after selectively etching ZnO. ZnO nanoparticles acted as both a Zn source and a meso-/macropore template for HP-ZIF-8. Systematic arsenic adsorption experiments showed that the presence of meso-/macropores can effectively enhance and accelerate arsenic removal via chemisorption. As a result, HP-ZIF-8 exhibited an As(III) adsorption capacity of 104.9 mg/g, nearly double that of traditional ZIF-8 nanoparticles, despite having remarkably more micropores. This study provides a highly adsorbable strategy to fabricate hierarchical porous metal–organic frameworks for pollutant removal.
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Jian-Lei Qi,Dan Zhou,Qin-Qin Xu,Jian-Zhong Yin,Kun-Peng Yu,Hai-Xin Sun
In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac) 2 as the precursor using the supercritical CO 2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO 2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene.
研究领域:
催化化学
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材料科学
·
纳米技术
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DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Li Zhao,Guiming Niu,Fucheng Gao,Kaida Lu,Zhiwei Sun,Hui Li,Martina Stenzel,Chao Liu,Yanyan Jiang
The development of novel electrode materials for rapid and sensitive detection of neurotransmitters in the human body is of great significance for early disease diagnosis and personalized therapy. Herein, gold nanorod@zeolitic imidazolate framework-8 (AuNR@ZIF-8) core–shell nanostructures were prepared by controlled encapsulation of gold nanorods within a ZIF-8 assembly. The designed AuNR@ZIF-8 nanostructures have uniform morphology, good dispersion, a large specific surface area, and an average size of roughly 175 nm. Compared with individual ZIF-8 and AuNR-modified electrodes, the obtained core–shell-structured AuNR@ZIF-8 nanocomposite structure-modified electrode shows excellent electrocatalytic performance in the determination of dopamine (DA) and serotonin (ST). The designed AuNR@ZIF-8 exhibited a wide linear range of 0.1–50 μM and low detection limit (LOD, 0.03 μM, S/N = 3) for the determination of DA, as well as a linear range of 0.1–25 μM and low LOD (0.007 μM, S/N = 3) for monitoring ST. The improved performance is attributed to the synergistic effect of the high conductivity of AuNRs and multiple catalytic sites of ZIF-8. The good electroanalytical ability of AuNR@ZIF-8 for detection of DA and ST can provide a guide to efficiently and rapidly monitor other neurotransmitters and construct novel electrochemical sensors.
研究领域:
材料科学
·
生物医学工程
·
分析化学
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DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 16
·5425
·
IF 3.4
Shuo Xiao,Zheng Jiao,Xuechun Yang
Triethylamine (TEA) is a typical volatile organic compound (VOC) widely present in air and water, produced in industrial production activities, with high toxicity and great harm. Fluorescence detection and resistive sensing are effective methods for detecting pollutants. Here, In-doped interpenetrating twin ZIF-8 and its annealed derivatives have been successfully designed and prepared as a multifunctional TEA sensor. On the one hand, ZIF-8-In exhibits excellent fluorescence emission enhancement at 450 nm in a dose-dependent manner to TEA in water within the concentration range of 1–100 ppm, with a detection limit as low as 1 ppm. On the other hand, the annealed ZIF-8-In derivative is ZnO/In2O3with a porous hierarchical structure, which is a perfect sensitive material for manufacturing gas sensors. Within the concentration range of 1–100 ppm, the ZnO/In2O3gas sensor has a high response for 100 ppm TEA, reaching 107.7 (Ra/Rg), and can detect TEA gas as low as 1 ppm. Furthermore, the response of ZnO/In2O3sensors to TEA is at least 10 times that of the other four VOC gases, demonstrating excellent gas selectivity. This multifunctional sensor can adapt to complex detection situations, demonstrating good application prospects.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yunshi Liu,Rui Wang,Tong Zhang,Sen Liu,Teng Fei
The development of NO 2 gas sensors is of great importance for air quality monitoring and human health. In this work, In 2 O 3 and zeolitic imidazolate framework-8 (ZIF-8) heterostructures were synthesized and designed as efficient sensing materials for NO 2 detection. The ZIF-8 nanocrystals were uniformly deposited on In 2 O 3 nanofibers (NFs) by using a self-template strategy, where In 2 O 3 /ZnO NFs act as the source of Zn 2+ for the formation of ZIF-8 and as the template. By tuning the amount of Zn 2+ in the composite NFs, different morphologies from In 2 O 3 NFs with minimal ZIF-8 loading to an In 2 O 3 /ZIF-8 core-shell complex were obtained. The optimized In 2 O 3 /ZIF-8 NFs show a remarkably high response to 1 ppm NO 2 (R g /R a = 16.4) and enhanced humidity resistance due to the hydrophobicity of ZIF-8 in comparison with those of the pristine In 2 O 3 NF sensor (R g /R a = 4.9) at 140 °C. The gas sensing mechanism of In 2 O 3 /ZIF-8, which is based on electron transduction, surface chemistry, and the functional interface between the loaded ZIF-8 and In 2 O 3 matrix, was proposed. Additionally, the large number of pores, which were formed by the in situ conversion of ZnO grains in the matrix, ensures that all parts of the In 2 O 3 NFs are accessible to gases. This facile strategy paves the way for the design of metal oxide/MOF complex architectures with tunable metal centers for various applications, including gas sensing.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 46
·期 2
·554-563
·
IF 4.177
Erbin Shi,Huiming Lin,Qian Wang,Feng Zhang,Shaoxuan Shi,Tingting Zhang,Xin Li,Hao Niu,Fengyu Qu
A novel ZIF-Ni composite film has been successfully prepared by a facile method involving the in situ deposition of ZIF-8 on a nickel porous film which is fabricated by selectively etching copper from a dense Ni/Cu alloy film. The nanostructures of the resulting ZIF-Ni composite films are carefully examined by a combination of scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray (EDX), and nitrogen adsorption–desorption. Cyclic voltammetric and amperometric studies show the enhanced electrocatalytic properties of the ZIF-Ni composite film electrodes toward hydrazine oxidation relative to the synergistic effect of ZIF-8 and porous Ni films. The application potential of the composite films as amperometric detectors is explored for the determination of hydrazine. A high sensitivity of 805.5 μA mM−1 for hydrazine detection with a low detection limit of 0.021 μM (S/N = 3) and a wide linear range from 2.5 μM to 28 mM are revealed for this new type of composite film as the detecting electrode. Moreover, the composite films exhibit excellent selectivity and remarkable stability for the oxidation of hydrazine. This can offer new opportunities for the fast and selective detection of hydrazine and provide a promising platform for sensor designs for hydrazine detection.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruimin Zhu,Lucy Wang,Huayu Zhang,Chunjie Liu,Zhengbao Wang
ZIF-8 membranes have attracted extensive research attention due to their ease of synthesis, stable properties, and wide applicability. Compared to expensive inorganic supports, organic polymer supports are more flexible and inexpensive. However, addressing the issue of weak adhesion between the surface of the organic support and the ZIF-8 membrane layer poses a significant challenge. In this study, we present a strategy for preparation of ZIF-8 membrane by the fabrication of an asymmetric dual-layer polymeric hollow fiber support using polyvinylidene fluoride (PVDF) as the material. The outer layer of the support is composed of PVDF embedded with ZIF-8 seeds, while the inner layer consists of pure PVDF. This approach addresses the weak adhesion between the support and the ZIF-8 membrane layer formed through a one-step solvothermal crystallization process. The effects of ZIF-8 seed size, content, and crystallization conditions on the membrane structure and performance are investigated. Under the synergistic molecular sieving effects of ZIF-8 continuous membrane layer and ZIF-8 crystals within the outer layer of the support, larger gas molecules are difficult to penetrate the membrane layer, making the resulting membrane highly selective for the gas separation. Under the optimal fabrication conditions, the H 2 permeability of the ZIF-8 membrane is determined to be 1.52 ± 0.1 × 10 −7 mol·Pa −1 ·s −1 ·m −2 , with a H 2 /N 2 ideal separation selectivity of 69.5 ± 4. This method demonstrates simplicity and high reproducibility for preparation of ZIF-8 membranes on dual-layer hollow fibers, and it is expected to be extended to the growth and fabrication of other MOF membranes.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ChemNanoMat
·
2021
·Vol. 7
·期 12
·1348-1354
·
IF 3.154
Jidong Bu,Chenxue Yao,Fengting Li,Shifeng Hou
Graphical A seeded growth synthetic strategy has been developed to synthesize ZIF-8 nanostructures in the form of multipods. Systematic studies were carried out to reveal the effect of several reaction parameters on the growth pattern and thus product morphology. We report a facile method to fabricate ZIF-8 nanostructures in the form of multipods. The success of this work relies on the use of seeded growth as the synthetic strategy, where uniform polyhedral ZIF-8 nanocrystals were prepared initially and served as seeds, followed by the addition of Zn precursor and imidazole to allow preferable growth to specific facets of the seeds and thus the formation of multipod structure. In particular, we were able to rationally synthesize ZIF-8 nanostructures in the form of hexapod and dendrite, respectively, using the similar seeded growth procedure, when the seed morphology was cube and truncated rhombic dodecahedron, respectively. Systematic studies were carried out to reveal the effect of several reaction parameters (e. g., seed amount and CTAB concentration) on growth pattern and thus product morphology. The current work demonstrates the feasibility and versatility of seeded growth for synthesis of colloidal metal-organic frameworks (CMOFs) with multipod structure and could find important use in fabrication of CMOFs with controlled sizes and shapes.
研究领域:
材料科学
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Daixiong Zhang,Qing Xiang
As one of most studied MOFs , extensive efforts have been devoted on the novel strategy for tailoring the size of zeolitic imidazolate framework (ZIF-8). We report here a facile and general method that enables the size-controllable engineering of zeolitic imidazolate framework (ZIF-8) by changing the addition order of Zn(NO 3 ) 2 ·6H 2 O (A) and 2-methylimidazole (B), which is very different from the all reported methods. Significant size difference for ZIF-8 s was observed between adding A-methanol solution to B-methanol solution and adding B-methanol solution to A-methanol solution under room temperature magnetic stirring. The influence of addition order on the crystal size was also applicable for preparing ZIF-8 encapsulating metal precursor (M-ZIF-8). We believe that this work not only pave a new way for efficient and general size-controllable design of ZIF-8 and M-ZIF-8, but can be also bridged with other size engineering methods (such as solvothermal method).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）