APPLIED ORGANOMETALLIC CHEMISTRY
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2024
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IF 3.7
Safdar Ali Amur,Bharat Prasad Sharma,Najaf Ali Soomro,Quratulain Khuhro,Muhammad Tariq,Hao Liang,Mohsin Kazi,Mohammad Nur-e-Alam
In this study, Zeolitic Imidazolate Framework-8 (ZIF-8) nanomaterials were synthesized using a co-precipitation one-pot method that uses ethanol, methanol, and water as solvents for the precursors (2-methylimidazole and Zinc nitrate hexahydrate), resulting in yields of 66.77%, 73.14%, and 68.12%, respectively. The as-synthesized ZIF-8 nanomaterials were thoroughly characterized by X-ray diffraction analysis, transmission electron microscopy, ultraviolet–visible spectroscopy, and Fourier-transform infrared spectroscopy. The X-ray diffraction analysis showed that the crystallite size of ethanol-based ZIF-8 (24.76 ± 1.67 nm) was smaller than those synthesized in water (26.92 ± 1.89 nm) and methanol (31.39 ± 1.03 nm). However, methanol-based ZIF-8 exhibited lower crystallinity (85.93%) than water-based ZIF-8 (91.48%) and ethanol-based ZIF-8 (92.71%). Zeta potential studies revealed that ethanol-based ZIF-8 had a larger surface charge (+37 mV) than water-based ZIF-8 (+35 mV) or methanol-based ZIF-8 (+24 mV). Transmission electron microscopy analysis confirmed particle sizes of 54.35 ± 2.11 nm for ethanol-based ZIF-8, 57.91 ± 2.26 nm for water-based ZIF-8, and 63.25 ± 4.12 nm for methanol-based ZIF-8. Thermogravimetric analysis indicated thermal stability up to 800 °C, with mass losses of 55.98% for ethanol-ZIF-8, 50.12% for water-based ZIF-8, and 65.36% for methanol-based ZIF-8 by 600 °C. In antibacterial studies, water-based ZIF-8 exhibited the largest zone of growth inhibition (17.30 ± 0.26 mm) against Escherichia coli compared to ethanol-based ZIF-8 (15.57 ± 0.32 mm) and methanol-based ZIF-8 (14.70 ± 0.20 mm). Pearson's correlation study revealed that zeta potential, crystallinity, and antibacterial activity are positively related. Furthermore, water-based ZIF-8, with a minimum inhibitory concentration of 50 μg/100 μL, confirmed evident cell membrane disruption. Molecular docking experiments revealed ZIF-8's significant binding affinity for the E. coli protein 5AZC, supporting its robust antibacterial activity.
研究领域:
材料科学
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生物学
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药物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2018
·Vol. 47
·期 9
·5509-5517
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IF 1.566
Wang Wenzhao,Chen Xiaoxiao,Zeng Xiangbin,Wu Shaoxiong,Zeng Yang,Hu Yishuo,Xu Sue,Zhou Guangtong,Cui Hongxing
Recently, great efforts have been devoted to study of molybdenum disulfide (MoS 2 ), particularly monolayer MoS 2 semiconductor thin films, due to its excellent electrical and optical properties. Direct growth of continuous monolayer MoS 2 films by ambient-pressure chemical vapor deposition is reported herein. Optical microscopy, Raman spectroscopy, photoluminescence spectra (PL), atomic force microscopy, x-ray photoelectron spectroscopy (XPS), and high-resolution transmission electronic microscopy were used to characterize the electronic and structural properties of the films, demonstrating that the MoS 2 films grown on silicon dioxide/silicon (SiO 2 /Si) substrate with spatial size on micron scale were high quality, single crystal, continuous, and monolayer. Raman and PL mapping were performed to confirm the uniformity of the monolayer MoS 2 films. The morphological variation of the MoS 2 films after different reaction times was observed by optical microscopy and scanning electron microscopy, revealing the growth process and thus helping to understand that the growth mechanism during synthesis of continuous large-area films depends on the distribution of the reactive intermediate molybdenum oxide (MoO 3− x ) due to its lower saturation vapor density. Back-gated transistors based on MoS 2 films were fabricated, exhibiting current on/off ratio of ∼ 10 4 and subthreshold swing (SS) of 0.44 V dec −1 . This work contributes to synthesis of large-area continuous films, thus paving the way for future scaled-up fabrication of MoS 2 electronic devices.
研究领域:
材料科学
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纳米技术
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表面科学
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半导体物理
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薄膜生长
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2013
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IF 2.562
Lei Xue,Dengxu Wang,Zhizhou Yang,Yan Liang,Jie Zhang,Shengyu Feng
Polysiloxanes are unique hybrid inorganic and semi-inorganic polymers that have a wide range of applications in industries. In this study, we report a facile and efficient approach to prepare functional polysiloxanes via thiol–ene reaction. The functional polysiloxanes were characterized and confirmed by 1 H NMR, 13 C NMR, FT-IR, GPC, TGA and DSC. Influence of thiol and vinyl structure over reaction rate was analyzed. The proportion of α- and β-addition product was also determined by 1 H NMR. GPC analysis showed that the molecular-weight distribution of polysiloxanes cannot be disturbed in thiol–ene reaction.
研究领域:
材料科学
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有机化学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2014
·Vol. 11
·期 9
·1767-1777
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IF 4.151
Shangyang Li,Lin Zhang,Bo Wang,Mingfang Ma,Pengyao Xing,Xiaoxiao Chu,Yimeng Zhang,Aiyou Hao
Vesicles were formed in aqueous solution using β-cyclodextrin (β-CD) complexes with a series of ultra-small aromatic molecules. The vesicles are easy to prepare without a complicated synthesis procedure and their structure was identified and characterized using various techniques, including transmission electron microscopy, atomic force microscopy and dynamic laser light scattering. Using the β-CD/L-phenylalanine system as a representative example, the structural factors that caused the self-assembly were revealed using proton nuclear magnetic resonance, Fourier transform infrared spectroscopy and X-ray diffraction. In addition, the vesicular architecture could be endowed with a diverse range of stimuli-responses, as a consequence of the selective addition of various guest molecules. It is anticipated that this novel assembly strategy could be further extended, and that it presents new opportunities for the development of nanocarriers and soft materials.
研究领域:
纳米医学
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药剂学
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软物质材料
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分子自组装
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药物递送系统
✓ 已验证
DOI
高影响因子
CARBON
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2012
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IF 5.378
Qi Ma,Jinping Song,Chun Jin,Zuopeng Li,Jianhong Liu,Shuangming Meng,Jianguo Zhao,Yong Guo
A rapid and easy approach for synthesizing chemically reduced graphene oxide (CRGO) by using formamidinesulfinic acid (FAS) as a reducing agent is reported. The obtained CRGO nanosheets were characterized with Fourier transform infrared spectroscopy, UV–Vis absorption spectroscopy , Raman spectroscopy , X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy , atomic force microscopy and electrical conductivity . The possible reduction mechanism was proposed. The stronger reduction capacity of FAS was attributed to the synergistic effect of its hydrolysis products ( HSO 3 - and urea) in alkaline aqueous media .
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2015
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IF 2.467
Jun Qu,Xiaoman He,Bentao Wang,Lihua Zhong,Lei Wan,Xuewei Li,Shaoxian Song,Qiwu Zhang
In this study, we introduced a solvent-free mechanochemical route to synthesize Li–Al layered double hydroxide through a two-step grinding of LiOH and Al(OH) 3 , in which the mixture powder with Li/Al molar ratio at 1/2 was first dry ground for 2 h and then wet ground for another 1 h with water addition without any heating operation. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The products possessed highly crystalline of Li–Al LDH phase with no evident impure phases, presenting an easy and effective preparation of Li–Al LDH by using solvent-free mechanochemical approach.
研究领域:
材料科学
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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）