REACTIVE & FUNCTIONAL POLYMERS
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2018
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IF 2.975
Haiyang Wu,Yuntong Li,Birong Zeng,Guorong Chen,Yuzhe Wu,Ting Chen,Lizong Dai
In order to improve thermal and flame-retardant as well as mechanical properties of epoxy resins efficiently, a new P/N/Si-containing nano-filler called 2,4-(bis-polyhedral-oligomeric-silsesquioxane)-6-[(bis-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl)amine]-(p-4-hydroxyphenyl)-1,3,5-triazine (abbrev. PDT) was synthesized by nucleophilic aromatic substitution reaction and was combined with curing-agent to prepare epoxy resin composites, incorporating both nanocaged framework of Si O and rigid phenyl-rings from triazine and DOPO into the epoxy matrix at molecular level. The prepared EP-PDT composites were characterized by means of techniques such as TGA-IR, Raman, SEM, EDX analysis, Py-GC/MS and XPS etc. It showed that all samples had a single T g , indicating that these epoxy composites were homogeneous phase for long-term use. Both the LOI value and char yield increased with the increasing of PDT content, while the corresponding PHRR and THR data of EP composites dropped. SEM revealed that PDT in EP composites self-assembled into nano-sized particles, resulting in an enhanced mechanical property. Py-GC/MS and XPS characterizations showed that PDT could release free radicals and promote the char formation deriving from the synergic effect of phosphorus, nitrogen and silicon during combustion, which resulted in the formation of quenching and barrier effects to endow the EP composites with excellent thermal stability and flame retardancy for potential applications in many fields.
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高影响因子
JOURNAL OF POLYMER RESEARCH
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2018
·Vol. 26
·期 1
·1-6
·
IF 1.434
Liang HuaQing,Li Sihan,Liu Dong,Liu Yijun,Long YongJiang,Liang GuoDong,Zhu FangMing
Herein, we demonstrated the synthesis and characterization of a well-defined diblock copolymer consisting of isotactic poly( p -hydroxystyrene) ( i P( p -HOS)) and 1,4- trans -polybutadiene (1,4- trans -PBD), i P( p -HOS)- b -1, 4- trans -PBD, by the combination of sequential monomer addition and deprotection. Isospecific living polymerization of p - tert - butyldimethylsilyloxystyrene and living trans -1,4-polymerization of 1,3-butadiene were catalyzed by 1, 4-dithiabutandiyl-2, 2ʹ-bis(6-cumenyl-4-methylphenoxy) titanium dichloride (complex 1) activated by methylaluminoxane (MAO) at room temperature to provide highly stereospecific isotactic poly( p - tert -butyldimethylsilyloxystyrene) ( i P( p -TBDMSOS)) and 1,4- trans -polybutadiene (1,4- trans -PBD) with narrow molecular weight distribution. Furthermore, the i P( p -TBDMSOS)- b -1, 4- trans -PBD was prepared via sequential monomer addition in the presence of complex 1 and MAO. The deprotection of the i P( p -TBDMSOS) block was promoted by concentrated hydrochloric acid to produce i P( p -HOS)- b -1, 4- trans -PBD. In addition, the resultant diblock copolymer and intermediate polymers were characterized by gel permeation chromatography, nuclear magnetic resonance and differential scanning calorimeter.
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高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
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2015
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IF 3.444
Lan-mei Chen,Fa Peng,Guo-dong Li,Xin-ming Jie,Kang-rong Cai,Chun Cai,Yu Zhong,Hua Zeng,Wu Li,Zhen Zhang,Jin-can Chen
A new ruthenium methylimidazole complex [Ru(MeIm) 4 ( p -cpip)] 2 + ( Ru1 , p -cpip = 2-(4-chlorophenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline, MeIm = 1-methylimidazole) has been synthesized and characterized. The cellular uptake, in vitro cytotoxicities, cell cycle arrest and apoptosis-inducing mechanism of this Ru(II) complex have been extensively explored by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometry , Comet assay , inverted fluorescence microscope as well as Western blotting experimental techniques. Notably, Ru1 displayed relatively high cytotoxic activity against lung cancer A549 cells and had high selectivity between tumor and normal cells in comparison with cisplatin . Further studies showed that Ru1 caused cell cycle arrest at G0/G1 phase and induced apoptosis via the mitochondrial pathway, which involved reactive oxygen species (ROS) accumulation, mitochondrial dysfunction and Bcl-2 and caspase correlative family member activation. For providing more information about the possible antitumor mechanism, the in vitro DNA binding studies have been also investigated by different spectrophotometric methods, thermal denaturation and viscosity measurements.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Ruowen Liang,Fenfen Jing,Guiyang Yan,Ling Wu
Visible-light-initiated organic transformations have received much attention because of low cost, relative safety, and environmental friendliness. In this work, a series of CdS-decorated MIL-68(Fe) nanocomposites (CdS-M68 NCs) have been prepared via a facile room-temperature photodeposition technique in a controlled manner. Importantly, the CdS-M68 NCs exhibit remarkably enhanced photoactivity toward selective reduction of 4-nitroaniline (4-NA) to p -phenylenediamine (PPD) in water under visible light irradiation (λ ≥ 420 nm) as compared to bare CdS and MIL-68(Fe), giving a 4-NA conversion of ∼100% after irradiation for 8 min. The significantly enhanced photoactivity is attributed to the integrated factors of the effective transportation of the photogenerated electron-hole pairs and the enhanced visible light absorption intensity. Combining with trapping experiments and ESR analysis, it could be revealed that the photoexcited electrons and CO 2− radicals should be the main active species in the present system. In addition, a possible photocatalytic reduction mechanism has been investigated.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2024
·Vol. 171
·期 8
·083508
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IF 3.1
Xuan Dinh Ngo,Ngoc Huyen Nguyen,Thi Lan Huong Phung,Tuan Anh Nguyen,Nguyen Thanh Vinh,Quy Nguyen Van,Vinh Hoang Tran,Nhung Pham Tuyet,Anh-Tuan Le
In this study, we describe experimental efforts to decipher the role of ZnCo2O4 nanoflakes (ZCO-NFs) for selective enhancement of voltammetric responses of screen-printed electrode (SPE) toward redox species system. The ZCO-NFs sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV–vis spectroscopy. The electrochemical characterization of bare SPE and modified SPE electrodes was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott−Schottky analysis. A series of redox systems including paracetamol (PA), dopamine (DA), chloramphenicol (CAP), furazolidone (FZD), p-nitrophenol (p-NP), carbaryl (CBR), ofloxacin (OXF), and erythromycin (ERY) were selected to investigate for (i) reversible redox process, (ii) irreversible electrochemical oxidation process, and (iii) irreversible electrochemical reduction process on both bare-SPE and ZCO-NFs/SPE electrodes. The obtained results showed that ZCO-NFs possess the selective enhancement of electrochemical response for redox systems with an increase of 24%–90% for PAR, DA, FZD, CAP, and CBR and a decrease of 13%–49% for p-NP, ERY, and OFX. The different electrochemical response of redox species at nanostructured semiconductor electrodes is attributed to the contribution of both the adsorption capacity of redox species and the interfacial electron transfer process between electrode and redox species. An insight into the interfacial electron transfer kinetics and its contribution to the enhancement of electrochemical response on p-type semiconductor electrode is helpful in designing high-performance sensing platforms based on spinel oxide nanostructures.
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高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 48
·16885-16894
·
IF 4.029
Yan-Ru Chen,Qin Wang,Xue Bai,Zhen Yan,Yunkun Ning,Feng He,Zhijian Wu,Jun Zhang
The rational design of non-noble materials as low-cost, highly efficient, and durable catalysts to improve the oxygen reduction reaction is extremely urgent and challenging. The oxygen reduction reaction is a kinetically sluggish process that greatly affects the energy conversion efficiency. In this paper, novel hierarchical heteroatoms-co-doped Fe2M/graphene (M = P, N) nanocomposites were developed by a facile strategy, including hydrothermal and subsequent calcination methods. The thermal treatment of an ionic liquid and thiourea not only supplied heteroatom sources but also promoted the formation of iron phosphide and iron nitride and enhanced their catalytic performances. The electrochemical results indicated that the as-obtained hybrid catalysts manifested enhanced electrocatalytic activity toward the oxygen reduction reaction owing to the strong synergistic effects. The high content of heteroatoms distributed on the surface and interface of the hybrids and the density functional theory calculations suggested that Fe–N–C, Fe–P–C, and Fe–S–C multiple active surface sites were formed at the hybrids interfaces. Moreover, these results demonstrated that heteroatom-doped catalysts could effectively form a charge-transfer channel and thus modify the charge distribution in the hybrids interfaces. The as-prepared heteroatoms-doped Fe2M/graphene hybrids would be developed into highly efficient catalysts as ideal alternatives for noble metal catalysts in practical applications.
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PubMed
高影响因子
Nano Energy
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2018
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IF 13.12
Junjie He,Yuren Xiang,Fan Zhang,Jiarong Lian,Rui Hu,Pengju Zeng,Jun Song,Junle Qu
Inorganic NiO is a promising hole extracting material for p-i-n planar perovskite solar cells due to its low cost, ultra-high photo and thermal-stability, and high energy level of conduction band blocking photoelectron from perovskite to cathode to prevent charge recombination at the interface. However, the power conversion efficiency (PCE) of NiO-based p-i-n devices is still lower than TiO 2 based n-i-p devices because of relatively low light harvesting ability in the red light region and the low work function of NiO limited the improvement of open circuit voltage. In this study, a novel surface modification method was developed for NiO-based p-i-n planar devices, which enhanced red light harvesting ability and device open voltage. It proved that all three functional groups of surface modifier played key role to boost the device performance. Detailed investigations show an increased interface contact between perovskite and hole transport layer improving charge extraction, preferential orientation of perovskite crystal that insures external quantum efficiency higher than 90% in the whole visible light range and even up to 95% in short wavelength region. The surface treatment improves the short circuit current density from 20 to 23.6 mA cm -2 and open voltage from 1.06 to 1.12 V.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Weiyuan Yao,Yue Liu,Zhongbiao Wu
A series of CeO 2 @Ce-O-P “multi-core@shell” catalysts were synthesized in this paper for selective catalytic reduction (SCR) of NO with NH 3 . The experimental results had showed that CeO 2 @Ce-O-P-30:3 yielded best SO 2 tolerance of an over 70% deNO x efficiency at 250 °C in the presence of 100 ppm SO 2 for 20 h, which was much higher compared to pure Ce-O-P and CeO 2 samples. Further characterization results indicated that Ce-O-P coating layer could somewhat inhibit sulfur depositing on the catalysts during SCR reaction in the presence of SO 2 , thereby protecting the active sites from SO 2 poisoning. Especially, O 2 -TPD results illustrated that a great amount of active oxygen species were retained on used CeO 2 @Ce-O-P catalyst after a long term reaction. The synergetic effect of “multi-core@shell” structure could be attributed to such enhanced performances. The “core” CeO 2 devoted abundant active oxygen sites to fulfill the SCR reaction. And the “shell” Ce-O-P could not only provide acid sites, but also protect the active oxygen species by avoiding the over-adsorption of SO 2 on the catalyst. This work could provide a new way to increase the sulfur resistance for low temperature SCR catalysts.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Chunyu Liu,Xingchen Zhao,Liqiong Guo,Qilin Yu,Weifei Zhang,Zijuan Peng,Yan Gao,Xiaoyun Gong,Penghui Li,Hui Jiao,Tao Zhou,Qinghe Zhang,Shanjun Song,Guibin Jiang
With increasing concerns about N-(1,3-Dimethylbutyl)-N′-phenyl-p-phenylenediamine (6PPD) and 6PPD-quinone (6PPD-Q), relevant environmental investigations and toxicological research have sprung up in recent years. However, limited information could be found for human body burden assessment. This work collected and analyzed 200 samples consisting of paired urine and plasma samples from participants (50 male and 50 female) in Tianjin, China. Low detection frequencies (DF, <15 %) were found except for urinary 6PPD-Q (86 %), which suggested the poor residue tendency of 6PPD and 6PPD-Q in blood. The low DFs also lead to no substantial association between two chemicals. Data analysis based on urinary 6PPD-Q showed a significant difference between males and females ( p < 0.05). No significant correlation was found for other demographic factors (Body Mass Index (BMI), age, drinking, and smoking). The mean values of daily excretion (ng/kg bw/day) calculated using urinary 6PPD-Q for females and males were 7.381 ng/kg bw/day (female) and 3.360 ng/kg bw/day (male), and apparently female suffered higher daily exposure. Further analysis with daily excretion and ALT (alanine aminotransferase)/TSH (thyroid stimulating hormone)/ blood cell analysis indicators found a potential correlation with 6PPD-Q daily excretion and liver/immune functions. Considering this preliminary assessment, systematic research targeting the potential organs at relevant concentrations is required.
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高影响因子
TALANTA
·
2024
·
IF 5.6
Zhiquan An,Xiaoyu Jian,Wenjun Hong,Xilong Zhang,Jiateng Ma,Minjie Li,Bihong Zhang,Liang-Hong Guo
Dibutyl phthalate (DBP), a common and outstanding plasticizer, exhibits estrogenic, mutagenic, carcinogenic, and teratogenic properties. It is easily liberated from plastic materials and pollutes aquatic ecosystems, endangering human health. Therefore, highly sensitive and selective DBP detection methods are necessary. In this work, a free-of-electronic sacrificial agent photoelectrochemical (PEC) aptasensor for DBP detection was constructed using a novel Z-scheme Bi-doped BiOI/Bi 2 S 3 (Bi-BIS) p-n heterojunction. The Bi-BIS composites had higher visible-light absorption, charge transfer, and separation efficiency. This is attributed to the synergistic effect of the formation of Z-scheme p-n heterojunction between BiOI and Bi 2 S 3 , the plasma resonance effect of metallic Bi and photosensitization of Bi 2 S 3 , thus exhibiting large and stable photocurrent response in the absence of electron sacrificial agent, that was 10.4 and 6.4 times higher than that of BiOI and Bi 2 S 3 , respectively. Then, a DBP PEC aptasensor was constructed by modifying the DBP aptamer on the surface of the ITO/Bi-BIS electrode. The aptasensor demonstrated a broad linear range (2–500 pM) and a low detection limit (0.184 pM). What's more, because there is no interference from electronic sacrificial agent, the aptasensor exhibited excellent selectivity in real water samples. Therefore, the proposed PEC has considerable potential for DBP monitoring.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yancheng Yan,Zeyu Xue,Lianci Wu,Yumei Luo,Xiaodong Bai
In the process of oil and gas production, the failure of drilling fluid caused it to invade the formation, leading to wellbore instability. N-isopropylacrylamide (NIPAM), acrylamide (AM), and sodium p-styrene sulfonate (SSS) were used as raw materials, and the P(NIPAM/AM/SSS) (abbreviated as NAS) temperature-sensitive plugging agent was synthesized by inverse emulsion polymerization. The optimum synthesis conditions were obtained using a redox initiation system. Infrared measurements and UV–visible analysis showed that the target product was successfully prepared, and NAS exhibited a lower critical solution temperature (LCST) of 55°C, with sensitive temperature-responsive behavior. Rheological and filtration tests, along with high-temperature and high-pressure (HTHP) sand tray tests, demonstrated that the temperature-sensitive plugging agent effectively plugged the formation. Particle size analysis and Zeta potential analysis indicated that the addition of the temperature-sensitive plugging agent increased the electrostatic stability of bentonite-based slurry and polymer. Contact angle measurements and micro-morphology of the mud cake revealed that a hydrophilic-hydrophobic transition occurred at high temperatures in NAS, forming a dense hydrophobic film on the surface of the mud cake. This film effectively sealed cracks and micropores, reduced the invasion of free water, and improved wellbore stability.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Liangdi Jiang,Zhouyang Huang,Jiacan Xu,Liqiu Zhang,Ziwen Du
Selectivity is the key for adsorption or recovery of per- and polyfluoroalkyl substances (PFAS) from aqueous environments. In this study, the fluorinated metal–organic frameworks (MOFs) with different fluorine contents were prepared and investigated to evaluate the selective adsorption of an emerging PFAS, sodium p‑perfluorous nonenoxybenzenesulfonate (OBS). Adsorption of OBS increased with the increasing fluorine content of MOFs, and the best fluorinated MOFs showed an excellent selective adsorption capacity. The influence of various co-existing hydrocarbon substances on OBS adsorption was slight. The adsorption amount of OBS was 15-fold to that of the hydrocarbon surfactants (n-caprylic acid). The selectivity was attributed to the fluorinated structures of MOFs whose oil contact angle was up to 101°, and thus the oleophobicity of fluorinated structures made MOFs repel hydrocarbon compounds. Molecular dynamics simulations and density functional theory calculations indicated that the fluorinated structures were able to capture OBS molecules from the long distances (roughly 1–100 nm) via hydrophobic interaction, and then formed a F–F non-covalent interaction which was highly probable to be driven by a dispersion force to further attract OBS fluorinated tails within shorter distances (less than 3.5 Å). The combination of oleophobic and fluorophilic effects contribute to the exclusive selectivity of fluorinated MOFs for OBS molecule.
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高影响因子
危险品化学品经营许可证（带存储）