JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51418
·
IF 3.125
Lan Hao,Xulin Cui,Xiaoli Wu,Jingtao Wang,Yifan Li,Wenpeng Li,Xingzhong Cao,Haoqin Zhang
Efficient separation of aromatic-aliphatic hydrocarbon mixtures has long been an important topic in chemical industries. Organic nanofiltration (OSN) has been revealing great promise in separating solvent mixtures that has not been effectively resolved by the state-of-the-art technologies. Herein, novel OSN membranes are designed for the separation of toluene and n -heptane. Polyamide active layer with diaminonaphthalene as the aqueous phase monomer is prepared by interfacial polymerization for the first time. The addition of polydimethylsiloxane gutter layer, as well as the combination of spin coating technique and macroporous substrate, renders the membranes with loose and defect-free architectures. The as-designed membranes achieve a rather high selectivity of toluene over n -heptane (>4) together with ultra-high toluene permeance (>180 L m −2 h −1 bar −1 ). These membranes also present excellent stability in the long-term operation.
研究领域:
材料科学
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膜分离技术
·
化学工程
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纳米技术
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高分子化学
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工业催化
·
绿色化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Haitao Zhuo,Zhankui Mei,Heng Chen,Shaojun Chen
In this contribution, shape memory polymers (SMPs) of chemically-crosslinked zwitterionic polyurethanes (CZPUs) were fabricated by crosslinking of the N,N-bis(2-hydroxyethyl) isonicotinamide (BINA)/hexamethylene diisocyanate (HDI) polyurethanes system by using pentaerythritol (PER), followed by zwitterionization with 1, 3-propanesultone (PS). As the zwitterionic units increased, it was found that the glass transition of hard phase in CZPUs remains constant while that of soft phase shifted at lower temperature, and a broad glass transition was obtained. The broad glass transition enables CZPUs to display triple, quadruple, and quintuple shape memory behaviours. Meanwhile, due to the chemically-crosslinked structure, the CZPUs exhibited an excellent shape fixation and recovery. Furthermore, the CZPU also exhibited good moisture-induced shape memory effect (SME) with a fast and high shape recovery observed below 70% RH and at 37 °C. The excellent thermally-induced multi-shape memory effect and moisture-induced shape memory effect enable CZPUs to be applied as smart materials for many applications among them the biomedical fields .
研究领域:
生物材料学
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高分子科学
·
智能响应材料
·
组织工程
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药物递送系统
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再生医学
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生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 40
·21426-21433
·
IF 5.968
Peng Zhang,Jia Guo,Changchun Wang
A novel multifunctional conjugated nanoporous polymer colloid (CNPC) combined with metal nanocrystals has been synthesized using the Sonogashira coupling reaction in a toluene-in-water miniemulsion. It is composed of a poly(phenylene ethynylene) (PPE) network that is covalently inlaid with the locked-in Fe3O4 nanocrystals. The Fe3O4@CNPC has a narrowly distributed size and uniform morphology, preserves the advanced porosity and fluorescence emission of the conjugated polymer network, and shows rapid magnetic response and high catalytic activity. The magnetic content can be controlled during the synthesis. This is accompanied by a corresponding enhancement of the size and surface area of the mesopores. In view of those characteristics, Fe3O4@CNPC is able to behave as fluorescence sensor for the detection of phenolic compounds. Acetaminophen (APAP) has been used as a model compound and the test results demonstrate that the Fe3O4-catalyzed oxidation of APAP takes place within the pores of the PPE network in the presence of H2O2. The oxidized intermediates are reactive radicals and can remove electrons from the π-conjugated PPE network, eventually leading to a decrease or even quenching of its fluorescence. Since the multiple functions of Fe3O4@CNPC fully cooperate, it produces a rapid optical response and superior sensitivity for the detection of APAP at micromolar concentrations.
研究领域:
分析化学
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纳米医学
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生物传感
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药物代谢
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材料科学
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分子探针
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环境毒理学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2011
·
IF 3.37
Tao Liu,Haichao Su,Xiangjin Qu,Peng Ju,Lin Cui,Shiyun Ai
A novel amperometric biosensor based on immobilizing acetylcholinesterase on 3-carboxyphenylboronic/reduced graphene oxide–gold nanocomposites modified electrode was developed for the detection of organophosphorus and carbamate pesticides . Acetylcholinesterase was successfully immobilized on the electrode with relatively high activity by the specific binding between the boronic acid group of 3-carboxyphenylboronic and the glycosyl of acetylcholinesterase. The biosensor enjoyed good sensitivity owing to the excellent properties of gold nanoparticles and reduced graphene oxide , which promoted electron transfer reaction and enhanced the electrochemical response. Parameters affecting the biosensor response such as pH, applied potential, enzyme loading and inhibition time were optimized. Based on the inhibition of an organophosphorus insecticide on the enzymatic activity of AChE, organophosphorus and carbamate pesticides were determined with satisfactory results in the presence of acetylthiocholine chloride as a substrate. Moreover, the fabricated biosensor had good repeatability and high stability.
研究领域:
分析化学
·
环境毒理学
·
生物传感器
·
农药残留检测
·
纳米生物技术
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电化学传感
·
食品安全
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Yucan Che,Hongyu Pang,Huiyu Li,Lei Yang,Xinyao Fu,Shiqi Liu,Lan Ding,Juan Hou
Fluorescent carbon quantum dots are emerging as a new class of fluorescent probes due to their unique optical properties . Herein, we presented a simple, one-pot and effective preparation strategy for copper-functionalized carbon quantum dots (Cu-CDs). The Cu-CDs demonstrated excitation-independent emissions, high fluorescent quantum yield (~ 24.4%) and excellent fluorescent stability. The fluorescence of Cu-CDs could be quenched efficiently in the presence of histidine (His) due to the coordination occurring between surface Cu and imidazole side chains of His. Thus, the Cu-CDs could be used as an efficient fluorescent probe for His detection. Under optimal conditions, the fluorescent signals of Cu-CDs decreased linearly with the concentrations of His over a range of 0.1–15 µM. The detection limit was 30 nM. The proposed method provided obvious advantages of rapid response, convenience, simplicity, high selectivity and sensitivity. Moreover, good results also have been obtained for His detection in real biological fluid samples.
研究领域:
材料科学
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2015
·
IF 2.002
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng,Zhenwei Wu
A MnO x –NbO x –CeO 2 catalyst for low temperature selective catalytic reduction (SCR) of NO x with NH 3 was prepared by a sol–gel method, and characterized by NH 3 –NO/NO 2 SCR catalytic activity , NO/NH 3 oxidation activity, NO x /NH 3 TPD , XRD , BET, H 2 -TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicate that the MnO x –NbO x –CeO 2 catalyst shows excellent low temperature NH 3 -SCR activity in the temperature range of 150–300°C. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NO x adsorption. As the NO 2 content increases in the feed, water vapor does not affect the activity in NO 2 SCR. Meanwhile, water vapor significantly enhances the N 2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH 4 NO 3 into N 2 O.
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
表面科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jiawei Li,Xiaofeng Guan,Wenming Huang,Xiaoxia Zhong,Huiting Sun,Minghao Song,Wenjie Tang
Anaerobic fermentation of potato leaves and stems for organic acid synthesis, serving as food additives , faces impediments due to misconceptions about the effects of moisture stress on the acid-synthesizing microbiome . An ingenious method, avoiding interference from microbiome and nutrient integrations, was employed in the present study. Results showed that increasing the moisture level from 60 % to 75 % significantly improved lactic acid (182.64 %), acetic acid (163.55 %), propionic acid (1960.43 %), nonprotein nitrogen , free amino acid and ammonia levels but reduced pH value and water-soluble carbohydrate and hemicellulose levels. Microbiologically, the high-moisture groups enriched Lactiplantibacillus , Levilactobacillus and Enterobacter , upregulated glycolysis, nitrogen, pyruvate and propanoate metabolisms, and activated genes for acid-producing and ammonia-forming enzymes . Notably, Lactiplantibacillus and Enterobacter prevailed in glycolysis and nitrogen metabolism , respectively, and Levilactobacillus was more prominent in pyruvate and propanoate metabolism under high-moisture conditions. Collectively, a moisture level of 75 % benefited organic acid synthesis from potato waste via anaerobic fermentation.
研究领域:
微生物学
·
发酵技术
·
废弃物资源化
·
生物资源技术
·
食品添加剂
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）