CHEMOSPHERE
·
2024
·
IF 8.1
Hao Sun,Xiaobing Li
In the alkaline-surfactant-polymer flooding emulsion, oil droplets with various sizes exhibited different interfacial properties , resulting in different stabilization and destabilization behaviors. In view of this, it is expected to achieve outstanding oil-water separation efficiency by screening targeted demulsifier for oil droplets with different size ranges (0–1, 1–5 and 5–10 μm). Based on the size effect of oil droplets, a series of multibranched polyether-polyquaternium demulsifiers that integrated different charge neutralization and interfacial displacement functionalities were designed by regulating the cationicity and EO:PO ratios. As a result, the most effective polyether-polyquaternium variant for each size range of oil droplet was screened out. By employing these three selected polyether-polyquaternium variants in a sequential batch demulsification test, the maximum demulsification efficiency of 95.1% was obtained, which was much higher than that using a single polyether-polyquaternium variant (82.5%, 80.5% and 83.8%). The adsorption behaviors of polyether-polyquaternium variants on the oil/water interface were investigated by the molecular dynamics simulation. Moreover, the interfacial properties and oil droplet size variations during the demulsification process were monitored, so as explore the demulsification mechanism. This demulsification protocol based on the size effect of oil droplets with its excellent oil-water separation performance offered significant technical promise for the emulsified oil wastewater disposal.
研究领域:
石油工程
·
化学工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Wanyi Zhang,Chenyu Zhou,Junshu Wang,Hanbo Wang,Xingguang Su
To ensure a sensitive and accurate assessment of potential health hazards posed by tertiary butylhydroquinone (TBHQ) in food products, we developed a novel ratiometric fluorescence-colorimetric dual-mode sensing system for TBHQ monitoring, which integrated copper‑cerium oxide nanocubes (Cu-CeO 2 NCs) with nitrogen-doped carbon dots (N-CDs). The Cu-CeO 2 NCs with excellent peroxidase-like activity could catalyze the H 2 O 2 -mediated oxidation of o -phenylenediamine (OPD) to fluorescent 2,3-diaminophenothiazine (DAP). The DAP exhibited ultraviolet absorption at 415 nm with fluorescence emission at 565 nm, that could quench the fluorescence of N-CDs at 469 nm via inner filter effect. TBHQ with strong antioxidant capacity inhibited the oxidation of OPD, thus restoring the fluorescence of N-CDs. Therefore, a dual-mode sensing platform was established for TBHQ analysis with the limits of detection of 0.64 and 0.81 μg/mL, respectively. This platform demonstrated good practicability through its successful implementation in detecting TBHQ in edible oils.
研究领域:
食品科学
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分析化学
·
纳米生物学
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 13
·2100070
·
IF 2.527
Hongyang Wang,Shuai Lan,Yu Zhang,Lu Zhang,Dandan Jia,Weiguo Zhang,Chun Liu,Lei Cao,Dongjun Wang
For the unusual phenomenon of nontraditional intrinsic luminescence, a systematic fluorescence study is conducted in the phase transformation from solution through hydrogel to solid states. In this process, significant differences are found in fluorescence intensity, peak position, lifetime, and excitation-dependent emission. In particular, the samples in the hydrogel state show two fluorescent peaks at 480 and 516 nm, respectively, while only one fluorescent peak is detected in the cases of solution (at 516 nm) or solid (at around 450 nm). More interestingly, the longer wavelength peak presents excitation-dependent fluorescence, and the shorter one is excitation-independent. These unique fluorescent observations can be ascribed to the fact that the aggregates of amine groups act as the actual fluorescent centers, which are quite sensitive to their surrounding microenvironments. Based on these results, some simulation tests of sensors and intelligent hydrogels in response to water are also studied.
研究领域:
材料科学
·
光学
·
化学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 72
·41432-41438
·
IF 2.936
Min Chen,Wen Wu,Yuyuan Chen,Qingqing Pan,Yongzhong Chen,Zongfu Zheng,Yanjie Zheng,Liying Huang,Shaohuang Weng
Blue luminescent nitrogen-doped carbon nanodots (N-CDs) with pH-dependent properties were prepared from citric acid (CA), glutathione (GSH), and polyethylene polyamine (PEPA) using a two-step pyrolytic route. The N-CDs showed stable and strong emission bands at approximately 455 nm under 350 nm excitation. Moreover, the fluorescence of N-CDs can be gradually decreased by gradually increasing the pH value. A good linear relationship between the fluorescence intensity of N-CDs and the pH range of 3.0–9.0 was obtained. Thus, the response mechanism of N-CDs to pH was systematically investigated. N-CDs possessed –NH2, –COOH, and –CONH– as active functional groups, which allowed the variable protonation/deprotonation of N-CDs to regulate the fluorescence emission intensities under changed pH values. Furthermore, upon combining urease-catalyzed hydrolysis of urea with increased pH values, a simple but effective fluorescence assay for urea was developed. The analytical performance for urea detection was the linear range of 0 to 10 mM with a detection limit of 0.072 mM. Additionally, the fluorescent sensor based on N-CDs was successfully applied for pH detection in synovial fluid and urea determination in serum.
研究领域:
生物化学
·
医学诊断
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Nano
·
2024
·
IF 8.2
Jiangyong Li,Qin Li,Qian Yang,Qi Tang,Xiaoyi Hu,Qing Liu,Liangke Zhang
Reactive oxygen species (ROS)-based antitumor strategies, particularly chemodynamic therapy, have garnered considerable attention. However, challenges such as difficulties in achieving deep penetration, relatively low H 2 O 2 levels in the tumor microenvironment, the requirement for low pH by the Fenton reaction, and their short lifespan have impeded satisfactory therapeutic outcomes. Hence, we have developed a nanoplatform with enhanced permeability that not only generates significant amounts of ROS but also converts them into longer-lasting reactive nitrogen species (RNS), thereby improving tumor therapy efficacy. In our study, carbon dots were functionalized by doping with gold atoms and grafting nitrosoglutathione (GSNO) to form ACN, which exhibits glucose oxidase-like properties and enables laser-responsive NO release. ACN and indocyanine green (ICG) were then loaded onto MnO 2 nanoflowers to form MnO 2 @AI. Upon arrival at the tumor site, MnO 2 reacts with H 2 O 2 and GSH, leading to its degradation and the subsequent release of ACN, which is characterized by three permeation-promoting properties: ultra-small size, positive charge, and NO content. In addition, ACN promotes H 2 O 2 production through glucose metabolism and reduces pH, both of which enhance the Fenton-like reaction of MnO 2 , thereby amplifying ROS generation. The ICG in MnO 2 @AI enhances its photothermal properties, leading to the responsive release of NO from GSNO grafted onto ACN, which then reacts with the increased ROS to generate more toxic RNS. Collectively, the approach described herein offers substantial potential for advancing the treatment of malignant tumors.
研究领域:
纳米技术
·
癌症治疗
·
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 35
·20029-20034
·
IF 3.049
Jianzhong Zhang,Yuyuan Chen,Zongfu Zheng,Zhenzhen Wang,Yanjie Zheng,Xinhua Lin,Shaohuang Weng
As a vital, copper-containing oxidase, tyrosinase (TYR) is useful as a biomarker for the screening of skin diseases. In this paper, a convenient and sensitive homogeneous fluorescence detection platform for the assay of TYR activity without any modified steps is described. Inspired by the fact that carbon dots (CDs) with excellent properties can be obtained through some surface modification, amine rich carbon dots (N-CDs) using a nitrogen doping process were developed as the fluorescent probe for this assay. The effect and the response mechanism of the degree of nitrogen doping in relation to the response of different CDs to the sensing of TYR activity using dopamine (DA) as a substrate were investigated. The DA was oxidized to o-dopaquinone with the catalyzation of TYR and quenched the fluorescence of the N-CDs by direct interaction. By using a set concentration of DA and other optimized reaction conditions, the fluorescence intensity of the N-CDs was directly applied to monitor the TYR activity. This assay for TYR activity showed a broad linear range from 0.05 to 6.0 U mL−1 with a detection limit of 0.039 U mL−1. The satisfactory recovery of the sensor for TYR activity in diluted human serum illustrated a potential clinical application.
研究领域:
生物化学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yuyuan Chen,Zhenzhen Wang,Xiaoli Hao,Fenglan Li,Yanjie Zheng,Jianzhong Zhang,Xinhua Lin,Shaohuang Weng
Detection of acid phosphatase (ACP), a universal and important enzyme, is crucial in monitoring several diseases. However, the selectivity of ACP detection under neutral conditions is poor. Herein, ACP was found to catalyze dopamine as a new substrate to polydopamine in acidic or neutral conditions, whereas alkaline phosphatase (ALP) failed to serve such function. The catalytic mechanism underlying the formation of polydopamine was investigated. A simple assay for ACP was developed using fluorescent carbon dots as a signal indicator. In the presence of ACP, dopamine polymerization was conducted in situ and carbon dots were quenched through the inner filter effect. This fluorescent bioassay illustrated a good analytical performance with a wide linear range and a detection limit of 0.45 U/L. In particular, ACP showed high selectivity from the interference of ALP under neutral conditions. Furthermore, excellent test recovery in human serum samples demonstrated the predictable applications of this method in clinical and biomedical areas.
研究领域:
生物化学
·
医学检测
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 46
·27050-27059
·
IF 3.049
Xia Wang,Wulan Zeng,Hongyan Zhang,Dan Li,Hongjing Tian,Xiude Hu,Qian Wu,Chunling Xin,Xiaoyu Cao,Wenjing Liu
To reduce the cost of CO2 capture, polyethylene polyamine (PEPA), with a high amino density and relatively low price, was loaded into MCM-41 to prepare solid sorbents for CO2 capture from flue gases. In addition, methoxypolyethylene glycol (MPEG) was codispersed and coimpregnated with PEPA to prepare composite sorbents. The pore structures, surface functional groups, adsorption and regeneration properties for the sorbents were measured and characterized. When CO2 concentration is 15%, for 30, 40 and 50 wt% PEPA-loaded MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.15, 1.47 and 1.66 mmol g−1 at 60 °C; for 30 wt% PEPA and 20 wt% MPEG, 40 wt% PEPA and 10 wt% MPEG, and 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.97, 2.22 and 2.25 mmol g−1 at 60 °C; the breakthrough and equilibrium adsorption capacities for 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41 respectively reached 2.01 and 2.39 mmol g−1 at 50 °C, all values showed a significant increase compared to PEPA-modified MCM-41. After 10 regenerations, the equilibrium adsorption capacity for codispersed MCM-41 was reduced by 5.0%, with the regeneration performance being better than that of PEPA-loaded MCM-41, which was reduced by 7.8%. The CO2-TPD results indicated that the mutual interactions between PEPA and MPEG might change basic sites in MCM-41, thereby facilitating active site exposure and CO2 adsorption.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yanchao Xu,Dongxue Guo,Tong Li,Yirong Xiao,Liguo Shen,Renjie Li,Yang Jiao,Hongjun Lin
Nanofiltration (NF) membranes with tannic acid (TA) based selective layers have been intensively studied in recent years, but they still suffer from poor inorganic salt rejection. This study provided a first report on mussel-inspired co-deposition of TA and amine to obtain high-performance NF membranes. The inorganic salt separation performance of the as-prepared NF membrane was significantly improved by optimising the amine molecular weight. The membranes prepared by TA and various amines were characterised by X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared (ATR-FTIR), scanning electron microscopy (SEM), zeta potential, and water contact angle measurement. It was found that amines with low molecular weight, such as ethylenediamine (EDA) and diethylenetriamine (DETA) facilitated the co-deposition onto the membrane surface, while polyethylene polyamine (PEPA) and branched polyethylenimine 600 (PEI600) enhanced the precipitation in solution. The TA/DETA co-deposited membrane showed an MgCl 2 rejection of 83.5% and a pure water permeance of 4.5 L m −2 h −1 bar −1 . The rejection was higher than the reported TA based NF membranes in the literature. In addition to demonstrating a TA based NF membrane with the improved inorganic salt rejection, this study provided new insights into the mussel-inspired co-deposition for material surface engineering towards various applications.
研究领域:
材料科学
·
环境工程
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2452-2464
·
IF 3.665
Binglin Wang,Jiaxin Li,Xuejun Lai,Hongqiang Li,Yishen Chen,Xingrong Zeng
Endowing intumescent flame retardant (IFR) with free-radical quenching capability is a promising method to improve its efficiency. Herein, a novel N -alkoxyamine containing macromolecular intumescent flame retardant (RQMIFR) was synthesized via nucleophilic substitution reaction and combined with ammonium polyphosphate (APP) to improve the thermostability and fire resistance of polypropylene (PP). The results showed that there was a good synergism between RQMIFR and APP, which effectively enhanced the thermostability and flame retardancy of PP. When the content of RQMIFR was 8.33 wt% and APP was 16.67 wt%, the limiting oxygen index of PP increased from 19.0% to 39.5% and achieved a UL-94 V-0 rating. Besides, the peak heat release rate, total heat release, carbon monoxide production, and carbon dioxide production were remarkably reduced. It was revealed that during combustion, RQMIFR generated nitroxyl free-radicals and quenched the active free radicals produced by PP both in gas and condensed phase. Simultaneously, RQMIFR and APP worked synergistically to form a compact intumescent char layer through the esterification, cross-linking, cyclization, and foaming reactions, thus effectively improved the thermostability and flame retardancy of PP.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Li Lao,Kuo Liu,Li Ren,Jinhong Yu,Jingzhen Cheng,Yuqi Li,Shaorong Lu
Developing waterborne epoxy (WEP) coatings with excellent corrosion resistance and tribological properties is a key aspect to solve the damage of Q235 steel. In this work, perylene bisimide (PBI) derivatives dispersion graphene (GR) were prepared by a π–π stacking, the highly orientated PBI0.5%/GR0.5%/WEP coating will be prepared by the rotating coating method. Especially, the impedance value reached about 109 Ω·cm2 when the PBI and GR ratio is 1:1. The impedance value of PBI0.5%/GR0.5%/WEP coating increased by 3 orders of magnitude compared with that of pure WEP coating (106 Ω·cm2). Additionally, the coefficient of friction of the coatings was 0.33; compared with that of WEP, the coefficient of friction decreased by 48%, and the wear resistance increased by 87.6%. The results show that the PBI0.5%/GR0.5%/WEP coatings exhibited excellent corrosion resistance and wear resistance properties due to the good dispersion and high orientation of PBI/GR in WEP. It is anticipated that our current work would guide the ongoing efforts to develop a more efficient method to overcome the poor dispersion of GR in waterborne epoxy resin and provide a green coating with excellent corrosion resistance and wear resistance properties.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2012
·Vol. 90
·期 2
·265-272
·
IF 1.773
Chengsheng Gui,Xiaoqing Liu,Di Wu,Tuo Zhou,Guyue Wang,Jin Zhu
The most commonly used curing agents for soy-based adhesives are polyamines, which have the problem of low solid content and/or high viscosity. To overcome this problem, a new type of polyamidoamine (PADA) resin was synthesized and applied to soy flour-based adhesives to improve their water resistance. The PADA solution obtained had a high solid content of 50 wt% and low viscosity of 270 cP. The optimum weight ratio of soy flour/PADA/maleic anhydride to prepare adhesive was 40/7/1.68. The wet strength of plywood prepared at the optimum weight ratio was 0.82 MPa, which meant the plywood could be used as type II plywood according to the Chinese National Standard GB/T 9846.7-2004. The results of water-insoluble solid content measurement and SEM observation demonstrated that cured soy flour–PADA–maleic anhydride adhesive had a 16 % greater water-insoluble solid content than soy flour–NaOH adhesive. The cross-linking network formed by the reactions of PADA and MA would increase the water-insoluble solid contents and improve water resistance of cured soy flour-based adhesives.
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）