ACS Applied Materials & Interfaces
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2014
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IF 5.9
Wangen Zhao,Gang Wang,Qingwen Tian,Yanchun Yang,Lijian Huang,Daocheng Pan
Cu2ZnSn(S,Se)4 semiconductor is a promising absorber layer material in thin film solar cells due to its own virtues. In this work, high quality Cu2ZnSn(S,Se)4 thin films have been successfully fabricated by an ethanol-based sol–gel approach. Different from those conventional sol–gel approaches, SnS2 was used as the tin source to replace the most commonly used SnCl2 in order to avoid the possible chlorine contamination. In addition, sodium was found to improve the short-circuit current and fill factor rather than the open-circuit voltage due to the decrease of the thickness of small-grained layer. The selenized Cu2ZnSn(S,Se)4 thin films showed large densely packed grains and smooth surface morphology, and a power conversion efficiency of 6.52% has been realized for Cu2ZnSn(S,Se)4 thin film solar cell without antireflective coating.
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HIGH PERFORMANCE POLYMERS
·
2014
·
IF 1.09
Jiangtao Liu,Guofei Chen,Xingzhong Fang
A series of isomeric poly(thioether ether imide)s (PTEIs) containing both thioether and ether linkages were prepared by aromatic nucleophilic substitution reaction of isomeric bis(chlorophthalimide)s (BCPIs) with bis(4-mercaptophenyl) ether (BMPE). The inherent viscosities of synthesized polymers were found in the range of 0.41–0.86 dL g−1 in N-methyl-2-pyrrolidone at 30°C. The glass transition temperature (Tg) of the isomeric PTEIs were 210–242°C and increased by increasing the content of 3-substituted phthalimide unit in the polymer backbone. The 5% weight loss temperature values reached up to 525–539°C under nitrogen and 523–534°C in air atmospheres, respectively, which indicated this kind of polyimide possessed excellent thermal stability. Flexible films could be cast from the polymer solution. The PTEI films exhibited moderate mechanical properties with tensile strengths of 106–127 MPa, elongations at break of 8.6–11.5%, and tensile moduli of 2.2–2.8 GPa, respectively. Dynamic mechanical thermal analysis results illustrated that the storage moduli (E′) of PTEI (a–e) almost completely maintained at about 2.3 GPa before reaching the corresponding Tg. It is noted that the minimum melt viscosity of isomeric PTEIs (a′–e′) decreased by increasing the content of unsymmetrical 3,4′-substituted phthalimide unit in the polymer main chain.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Ruiyong Wang,Xiaogai Wang,Zhigang Li,Yuanzhe Xie,Lingling Yang,Jie Shi,Junbiao Chang
The binding of 4′-azido-2′-deoxyfluoroarabinocytidine (FNC) or analogs (cytidine and 5′-cytidylate monophosphate) to bovine serum albumin (BSA) was investigated by fluorescence, UV–vis absorption spectroscopy and molecular modeling. The three compounds quenched the intrinsic fluorescence of BSA and the results revealed the presence of static quenching mechanism. The positive Δ H and positive Δ S for the systems suggested that the hydrophobic forces stabilized the interaction between the compounds and protein. Results also showed that FNC was the weakest quencher.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Xin Xiao,Chunlan Xing,Guangping He,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A facile solvothermal route is successfully developed to synthesize Bi 4 O 5 I 2 , a novel I-poor bismuth oxyiodide, with hierarchical nanoflake structure. The composition, structure, morphology, formation mechanism, photoabsorption, energy band, and photocatalytic properties of this material are systematically investigated. The results reveal that highly pure Bi 4 O 5 I 2 can be easily obtained by reacting Bi 3+ , I − , and OH − at pH values of 6 to 10 under solvothermal conditions, and the formation of such hierarchical structure can be explained by a dissolution–recrystallization mechanism. The as-synthesized Bi 4 O 5 I 2 nanoflakes show a favorable energy band structure (bandgap energy 2.17 eV, conduction band edge potential is more negative than the reduction potential of superoxide radicals), a high specific surface area (38.6 m 2 g −1 ), and a hierarchical micro/nano structures. Thus, they exhibit superior photocatalytic and mineralization efficiency for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) under visible light irradiation, with a reaction rate is 6.8 and 57 times faster than that of BiOI microspheres and N-doped TiO 2 , respectively. The photogenerated reactive species and degradation intermediates are identified, and possible photocatalytic mechanism is proposed. What's more, the as-synthesized Bi 4 O 5 I 2 nanoflakes remain stable during the photocatalytic reaction and can be used repeatedly, revealing their promising applications in the treatment of organic wastewaters.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
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2015
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IF 2.96
Junhui Pan,Langhong Wang,Guowen Zhang,Deming Gong
The characteristics of binding of 2-tert-butyl-4-methylphenol (TBMP), a synthetic phenolic antioxidant with hydroxypropyl-β-cyclodextrin (Hp-βCD) and calf thymus DNA (ctDNA) were investigated by multi-spectroscopic techniques and molecular simulation. The results indicated that TBMP preferred to form a 1:1 inclusion complex with Hp-βCD, with an inclusion constant of determined to be 7.15 × 10 3 L mol −1 . The intercalative mode of TBMP to ctDNA was supported by ctDNA melting temperature and relative viscosity studies, salt quenching effect, competitive binding with methylene blue and molecular modeling. The changes in Fourier transformed infrared (FT-IR) and circular dichroism (CD) spectra suggested that TBMP mainly bound to the G–C rich region with inducing a significant perturbation in B-like DNA structure. It was also found that Hp-βCD decreased the binding ability of TBMP with ctDNA, but did not affect the interactive mode between TBMP and ctDNA, and the formed inclusion complex of TBMP–Hp-βCD decomposed in the presence of ctDNA. This study may provide insights into the mechanism of binding of TBMP with ctDNA and the role of Hp-βCD in the TBMP–ctDNA interaction.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shengqian Wang,Junqiang Gu,Jinying Liu,Feiyan Xie,Chaochao Tao,Shuo Wang,Hualan Xu,Shengliang Zhong
Phosphors with high luminescence efficiency, tunable emission and high color rendering index (CRI) are vital importance for the quality of white light emitting diodes (w-LEDs) in real application. In this work, a new single phase color-tunable Na 5 Lu(WO 4 ) 4 :Tb 3+ ,Eu 3+ phosphor with outstanding luminescent properties was designed and synthesized. Its crystal structure, electronic structure, and luminescence features were studied in detail. The band gap of the host was calculated to be about 4.68 eV. The differential charge distribution after Tb, Eu doping through density functional theory simulation theoretically proved the electron redistribution in the W-O bond upon substitution of Tb 3+ /Eu 3+ . The energy transfer of Tb 3+ →Eu 3+ enabled tunable emission of luminescent colors from green to orange-red due to the quadrupole-quadrupole interaction. The optimal Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor exhibited excellent photoluminescence quantum yield of 84.19 % and good luminescent thermal stability (I 423K/298K = 75.90%) with an activation energy of 0.1976 eV. Finally, a white LED device with color coordinates of (0.3371, 0.3636), color rendering index of 89.4 and correlated color temperature of 5334 K was fabricated. These findings demonstrated that Na 5 Lu(WO 4 ) 4 :60%Tb 3+ ,20%Eu 3+ phosphor could be a potential orange-red-emitting color converter for white LEDs. This work not only assisted in the understanding of experimental observations but also provided a theoretical basis for the rational design of phosphors.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-13
·
IF 5.3
Guo Wenjie,Yu Zhiyong,Li Tianxu,Lu Lingfei,Lin Huiqi,Liao Ying,Zheng Yanghao,Liu Yuntao,Alevtinovna Glaskovich Maria,Barysavets Dzmitry S.,Chen Jinping,Zan Jie,Lu Jiandong
Urine retinol-binding protein 4 (RBP4) has recently been reported as a novel earlier biomarker of chronic kidney disease (CKD) which is a global public health problem with high morbidity and mortality. Accurate and rapid detection of urine RBP4 is essential for early monitor of impaired kidney function and prevention of CKD progression. In the present study, we developed a time-resolved fluorescence immunochromatographic test strip (TRFIS) for the quantitative and rapid detection of urine RBP4. This TRFIS possessed excellent linearity ranging from 0.024 to 12.50 ng/mL for the detection of urine RBP4, and displayed a good linearity ( Y = 239,581 × X + 617,238, R 2 = 0.9902), with the lowest visual detection limit of 0.049 ng/mL. This TRFIS allows for quantitative detection of urine RBP4 within 15 min and shows high specificity. The intra-batch coefficient of variation (CV) and the inter-batch CV were both < 8%, respectively. Additionally, this TRFIS was applied to detect RBP4 in the urine samples from healthy donors and patients with CKD, and the results of TRFIS could efficiently discern the patients with CKD from the healthy donors. The developed TRFIS has the characteristics of high sensitivity, high accuracy, and a wide linear range, and is suitable for rapid and quantitative determination of urine RBP4.
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JOURNAL OF PHARMACOLOGICAL AND TOXICOLOGICAL METHODS
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2024
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IF 1.3
Lingjiao Wang,Mengqiang Zhao,Jiao Li,Hongtao Xu,Yang Song,Yuanyuan Zhao,Jing Yu,Chunhua Zhou
Background Therapeutic drug monitoring for antidepressants (ADs) is vital due to the potentially serious consequences and disputes related to medical events. Therefore, we created a quick and convenient analysis way for separation and quantification of ADs. Methods To ensure quantitative stability, we divided the 16 ADs or their metabolites into 4 pools (AD1-AD4), considering the hospital frequency that the clinician prescribed, the physicochemical properties of medicines, and the calibration range of selected ADs. After precipitation with methanol, the analytes were eluted for at least 3.5 min on a BEH C 18 analytical column by different gradient elution methods. Results: The LLOQ and LOD were 1.25–10 ng/mL and 0.42–5 ng/mL, respectively. High precision (<12 %) and accuracy (87.07–111.47 %) were demonstrated by quality control samples both within and between days. All the compounds were stable at room temperature and within −80 °C. Conclusion The method is of wide clinical and laboratory interest due to simpler sample cleanup, shorter chromatographic run times, and wider calibration range compared to other methods.
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CARBOHYDRATE RESEARCH
·
2025
·
IF 2.5
Wei Wang,Jiarong Zhu,Yizhou Wang,Liangkun Long,Qunying Lin,Jing Wang,Shaojun Ding
Two new ɑ -galactosidases PpAgl27B and PpAgl27C from Penicillium parvum 4–14 were functionally investigated in this study. Based on the analysis of catalytic domain and phylogenetic tree, PpAgl27B (435 aa) and PpAgl27C (543 aa) belong to glycoside hydrolase (GH) 27 family. After expression in Pichia pastoris , the recombinant PpAgl27B and PpAgl27C showed the highest activities at pH 3.5 and 65 °C, or 4.0 and 45 °C, respectively. Using p -nitrophenyl- α - d -galactopyranoside ( p NPGal) as substrate, the Michaelis constant were 0.90 mM for PpAgl27B and 2.54 mM for PpAgl27C. PpAgl27C had a low catalytic activity toward p NPGal and negligible activities on various natural substrates. Differently, PpAgl27B efficiently released galactose from the artificial substrate, raffinose family oligosaccharides, or galactomannans. Hydrolysis of corn bran arabinoxylan (CBAX) 1 or 2 were conducted by PpAgl27B alone or in combination with the enzyme blend E_CBAX1. PpAgl27B released a small amount of galactose (1.7–3.0 mg/g) from the both substrates. Compared with the individual enzymes, the liberations of galactose, xylose and arabinose from the substrates were significantly enhanced by combing PpAgl27B and E_CBAX1. The degrees of synergy of the enzyme combination for the saccharification of CBAX1 or CBAX2 were 1.20 and 1.13, respectively. PpAgl27B showed promising potential for the valorization of galactose-rich feedstocks as well as CBAX.
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Journal of Energy Chemistry
·
2024
·
IF 14
Shicheng Deng,Songfan Wang,Yuanyuan Wang,Qian Xiao,Yuena Meng,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Zhi Zheng,Sixin Wu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from severe carrier recombination, limiting the photovoltaic performance. Unfavorable energy band alignment at the p-n junction and defective front interface are two main causes. Herein, oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the defects. With optimized oxygen incorporation conditions, the carrier separation and collection behavior at the front interface of the device is improved. In particular, it is found that oxygen incorporated absorber exhibits increased band bending, larger depletion region width, and suppressed absorber defects. These indicate the dynamic factors for carrier separation become stronger. Meanwhile, the increased potential difference between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier transport. As a consequence, the champion efficiency of CZTSSe solar cells has been improved from 9.74% to 12.04% with significantly improved open-circuit voltage after optimized air-annealing condition. This work provides a new insight for interface engineering to improve the photoelectric conversion efficiency of CZTSSe devices.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ning Wang,Xiaole Qi,Fengyan Xiao
Covalent organic frameworks (COFs), due to their unique structure and morphology, manifest great potential as active substrates to support noble metals for sustainable catalytic applications. However, it is still a challenge for efficient and effective catalysis using these kinds of COFs-based catalysts. Here, black phosphorus (BP) nanosheets modified spherical COFs (SCOFs) were synthesized, followed by the immobilization of Au nanoparticles (Au NPs) to fabricate Au NPs/BP/SCOFs microspheres . The as-prepared Au NPs/BP/SCOFs microspheres were then filled in a column for the continuous catalytic reduction of 4-nitrophenol. A fast and highly efficient flow-through catalysis of 4-nitrophenol with a reduction efficiency of 99 % under the flux of 2500 L m −2 h −1 was obtained. Furthermore, a stable catalytic performance under flow-through process was exhibited with only 0.13 wt% of total Au NPs releasing after testing for 24 h. The strategy for designing COFs-based substrates with enhanced electron transfer and controllable morphology would develop a new route to promote the application of these kinds of COFs-based catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaxi Zhang,Fen Wei,Sicen Wang
4-nitrophenol (4-NP) and 2,4-dichlorophenol (2,4-DCP) contaminated wastewater have attracted attention for their genotoxic and carcinogenic hazards. The magnetic MIL-101/CFO was constructed by synergistically integrating porous/hydrophilic/π-conjugated MIL-101(Cr) and CoFe 2 O 4 . The nanocomposites markedly accelerated the catalytic reaction activity. The BET characterizations reveal the nanocomposites had a larger specific surface area and pore volume in comparison to the individual CoFe 2 O 4 . The composite was employed to evaluate the adsorption and peroxymonosulfate (PMS)-activated ability of 4-NP and 2,4-DCP elimination. The adsorption equilibrium could be achieved within 60 min, following the pseudo-second-order kinetic model and the Langmuir isotherm model. The nanocomposites (0.2 g·L −1 ) achieved exceeding 96 % decomposition efficiencies toward 4-NP and 2,4-DCP (0.1 g·L −1 ) after 15 min by PMS (5.29 mM) activation. Notably, the reaction system displayed effective catalytic performance across pH 5 − 11 and resistance to the existence of saline ions and humic acid. According to the free radical quenching experiments and electron paramagnetic resonance, the non-radical route dominant by 1 O 2 and few HO • and SO 4 •− were affirmed to participate the reaction. The recyclable MIL-101/CFO/PMS system approached high adsorption and catalysis ability for phenolics remediation in the environmental application.
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