APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shijie Sun,Baijin Li,Wei Xiong,Boyu Fu,Yong Zhang,Zilin Ruan,Lei Gao,Xiaoqing Zuo,Jianchen Lu,Jinming Cai
Supramolecular self-assembly offers a feasible route for nanopatterning and functionality. The construction and precise control of selective adsorption at the molecular scale play essential roles in fundamental sciences and practical applications. Molecular tiling such as trihexagonal tiling Kagome networks has potential promising chemical and physical properties. Distorted Kagome-like networks controllable fabrication is possible by coupling molecular functional groups and substrate atoms. A chiral Kagome-like network was constructed using IFDO ([1,2-b]fluorene-6,12-dione) as precursor molecules complemented with molecular beam epitaxy and annealing strategies. Revealing arrangements of the assembled network of O-Cu metal coordination linked Kagome-like networks on the Cu(1 1 1) surface and their assembly mechanisms and cavity characteristics were explored in detail through scanning tunneling microscopy combined with density functional theory. Based on the electronic state difference between the hole center of the network and the molecular backbone, the host–guest network was successfully prepared by co-depositing C 60 molecules. Kagome-like networks could as an efficient template for regulating the adsorption configuration of C 60 . Our results demonstrate a controllable and efficient method to design atomically precise ordered host–guest assemblies on solid surfaces, advancing the approach is yet another step toward the fabrication of molecular devices.
研究领域:
表面科学
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纳米材料学
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超分子化学
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凝聚态物理
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分子自组装
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扫描探针显微学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 37
·15546-15552
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IF 0
Yitan Li,Lin Wei,Cuncun Wu,Chang Liu,Yanxue Chen,Hong Liu,Jun Jiao,Liangmo Mei
Uniform zinc oxide (ZnO) nanosheet arrays were grown on woven titanium wires using a low temperature hydrothermal method. Photoanodes were prepared by depositing CdS and CdSe quantum dots onto the ZnO nanosheet arrays by a successive ionic layer adsorption and reaction (SILAR) method. Solar cells were assembled using these nanostructured photoanodes and their photovoltaic performance was characterized. The effect of using SILAR cycles for the deposition of quantum dots on the performance of these nanostructured solar cells was investigated systematically. The overall light-to-electricity conversion efficiency of 0.98% was achieved under 100 mW cm−2 illumination for flexible CdS/CdSe co-sensitized solar cells using conventional Pt foils as counter electrodes. To further improve the performance of the flexible solar cells, PbS and Cu2S counter electrodes based on Pb and Cu foils were fabricated. The best conversion efficiencies of flexible CdS/CdSe co-sensitized solar cells using Cu2S and PbS counter electrodes were 3.4% and 2.5%, which demonstrated a significant enhancement in values for short circuit current, open circuit voltage, and fill factor compared to those obtained with the commonly used Pt and Au electrodes.
研究领域:
材料科学
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纳米科技
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能源材料
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光电化学
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半导体器件
✓ 已验证
DOI
CHROMATOGRAPHIA
·
2018
·Vol. 82
·期 3
·683-693
·
IF 1.401
Shen Chen,Wu Tong,Zang Xiaohuan
In this work, a zeolitic imidazolate framework-based graphene oxide composite (ZIF-8@GO) was prepared and used as the adsorbent in hollow fiber stir bar sorptive extraction. The stir bar was constructed of a small section of hollow fiber filled with 5 mg ZIF-8@GO and a thin stainless wire of 1.5 cm long in its lumen, and used to extract the trace levels of phthalate esters from children’s food samples prior to gas chromatography–mass spectrometric detection. The ZIF-8@GO showed a high adsorption efficiency for the compounds containing aromatic rings. The main experimental parameters that can impact the extraction efficiency including extraction temperature, extraction time, stirring rate, sample salinity, and desorption conditions were investigated. Under the optimized conditions, the limits of detection (LODs) for the five phthalate esters (diethyl phthalate, dipropyl phthalate, diisobutyl phthalate, butylbenzyl phthalate, and di(2-ethylhexyl) phthalate) were 0.15–0.6 µg L −1 for CiCi beverage and pear juice samples, and 0.75–2.2 µg kg −1 for jam samples. The limits of quantitation (LOQs) were 0.5–2.0 µg L −1 for CiCi beverage and pear juice samples, and 2.5–7.5 µg kg −1 for jam samples. Wide linear ranges of 0.5–500.0 µg L −1 and 2.5–2000 µg kg −1 were obtained for CiCi beverage, pear juice samples and jam samples, respectively, with good repeatability (RSD < 11%) and high method recoveries (72%–100%). The lifetime test results showed that the ZIF-8@GO-based hollow fiber stir bar can be reused for 120 extraction cycles without a significant loss of extraction efficiency, indicating its high durability and stability. The established method was applied successfully for the determination of the phthalate esters (PAEs) in children’s food samples. Graphical abstract
研究领域:
分析化学
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食品安全
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环境毒理学
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暴露科学
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食品化学
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污染物检测
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Yang-he Mo,Hui Wang,Shao-hua Jin,Ke-lin Peng,Zi-ming Yang,Pu-wang Li,Yu Chen
Fast curing hydrogels are highly valuable in the skin care industry. Multi-arm polyethylene glycol (PEG) is a commonly used crosslinking agent for the preparation of fast curing hydrogels. However, the hydrogel preparation using multi-arm PEG crosslinking agents usually requires the end group modifications of reactants, which makes the preparation process complicated and produces hydrogels with low curing rates. In the present study, a fast in situ curing hydrogel, 4-arm-PEG-succinimidyl carbonate/carboxymethyl chitosan (PEG-SC/CMCS), was prepared using 4-arm-PEG-SC as the crosslinking agent and carboxymethyl chitosan (CMCS), a derivative of natural polysaccharide with excellent comprehensive properties, as the framework without any end groups modified. The structure and properties of the prepared hydrogel were characterized by FTIR, XRD, SEM, rheology and swelling kinetics. The effects of reaction conditions on the structure and properties of hydrogel were investigated. The PEG-SC/CMCS hydrogel exhibited pH-sensitive swelling behaviors. Its application potential in skin care products is demonstrated with its excellent sustained-release performance of Vitamin C, a model drug for skin treatment, and high adsorption capacity of heavy metal ions that are easily deposited on skin surface. Our work has provided a new strategy for building multifunctional gel materials for skin care and offered a PEG-SC/CMCS hydrogel with great application potentials.
研究领域:
生物材料
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高分子化学
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药剂学
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皮肤科学
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组织工程
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药物递送系统
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环境毒理学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 8
·3864-3872
·
IF 2.562
Hao Liu,Chaoyang Wang
Chitosan scaffolds with hierarchical macroporous structures for recyclable adsorption of Cu(II) ions are prepared by templating from Pickering high internal phase emulsions (HIPEs) for the first time. The liquid paraffin-in-water HIPEs are stabilized by chitosan nanoparticles (CNPs). The internal phase fraction can be up to 90.0%; meanwhile, the chitosan concentration only needs to be 1.0 wt%. The chitosan scaffolds were obtained by crosslinking the dispersed CNPs, followed by removing the internal phase. The resulting scaffold exhibits the average pore size of around 15 μm and interconnecting channel size of several micrometers. The adsorption capacities of the chitosan–glutaraldehyde (chitosan–GLA) scaffolds for Cu(II) ions increase with increasing the molar ratio of –NH2 of CNPs to –CHO of GLA. At the optimized ratio of 2 : 1, the adsorption capacity is 60.2 mg g−1 at room temperature and pH 5.0. The adsorption capacity can be greatly improved by addition of carboxymethylated chitosan or adopting an imprinting method, and the adsorption capacities are 100.2 and 90.3 mg g−1, respectively. The adsorption isotherm of the chitosan scaffold closely follows Freundlich model. Furthermore, the adsorption capacity of the scaffold after undergoing 10 consecutive desorption–adsorption cycles still remains at a high level of 90.3%, suggesting the chitosan scaffold is a green and recyclable biosorbent for practical wastewater treatment.
研究领域:
环境科学
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材料科学
·
化学工程
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水处理技术
·
吸附
✓ 已验证
DOI
高影响因子
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