JOURNAL OF MOLECULAR STRUCTURE
·
2017
·
IF 1.753
Wenlu Pan,Yuming Zhou,Man He,Xiaohai Bu,Binbin Ding,Tingyuan Huang,Shuang Huang,Shiwei Li
Novel chiral N -propargylamide based on stigmasterol (M1, HC CCH 2 NHCOCH 2 CH 2 COO-R, R = stigmasteryl) and achiral N -propargylamide based on pivalic acid (M2) were prepared and (co)polymerized with rhodium zwitterions catalyst in CHCl 3 to afford helical polyacetylenes with moderate molecular weights (8997–26777) in good yields. The polymers were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC). Ultraviolet–visible spectroscopy (UV–Vis) and circular dichroism (CD) absorption spectra demonstrated that the as-prepared polymers could form helical structures with a preferential helicity. The formation of hydrogen bonds of poly(M1) in CHCl 3 was investigated according to the solution sate IR spectroscopic data . The single-handed helical conformation and polymerization degree of the new-typed poly( N -propargylamide)s could be controlled by the changing the feed ratio of chiral and achiral monomers . Furthermore, the infrared emissivity values (0.536–0.798) of copolymers were investigated at 8–14 μ m by the Infrared Emissometer.
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RSC Advances
·
2016
·Vol. 6
·期 51
·45791-45801
·
IF 3.289
Yingying Ren,Zhiyong Wei,Tong Wu,Yufei Bian,Xuefei Leng,Cheng Zhou,Yang Li
A large diversity of tailor-made linear-comb and star-comb poly(δ-valerolactone)s (PVL) have been obtained with hydroxylated polybutadiene (HPB) as a macroinitiator and 1,5,7-triazabicyclo-[4.4.0]dec-5-ene (TBD) as a catalyst by a simple “one-step” method. The critical content of this research was to explore systematically the differences in the physicochemistry properties between highly branched PVLs and linear PVLs, including the intrinsic viscosity, rheological properties, and crystallization and melting behavior. Studies of solution behavior and melting behavior elucidated that intrinsic viscosities in solution and complex viscosities in the bulk for comb branched PVLs were much lower compared with their linear and star counterparts. Both WAXD and DSC analysis of PVLs with different topological structures indicated that the comb branched architectures do not alter the structures of the PVL crystallites, but markedly improve the crystallization behavior, e.g. higher crystallinities. Moreover, the influence of the molecular weight of a single arm on the thermal properties and crystallization properties of the obtained linear-comb PVLs was explored. The results demonstrated that the crystallization temperatures (Tcs), melting temperatures (Tms) and crystallinities increased with the increase of molecular weight of a single arm. As such, a structure–property correlation is expected to be constructed which is of great practical importance in the syntheses and applications of highly branched polymers (HBPs).
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Nanoscale
·
2016
·Vol. 8
·期 19
·10160-10165
·
IF 7.76
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Cu2ZnSn(S,Se)4 (CZTSSe) semiconductors have been a focus of extensive research effort owing to low-toxicity, high abundance and low material cost. Yet, the CZTSSe thin film solar cell has a low open-circuit voltage value that presents challenges. Herein, using GeSe2 as a new Ge source material, we have achieved a wider band gap CZTSSe-based semiconductor absorber layer with its band-gap controlled by adjusting the ratio of SnS2 : GeSe2 used. In addition, the Cu2Zn(Sn,Ge)(S,Se)4 thin films were prepared with optimal Ge doping (30%) and solar cells were fabricated to attain a respectable power conversion efficiency of 4.8% under 1.5 AM with an active area of 0.19 cm2 without an anti-reflection layer.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Chang Liu,Peipei Hou,Wenxiang Chai,Jiawei Tian,Xuerong Zheng,Yaying Shen,Mingjia Zhi,Chunmei Zhou,Yi Liu
Two isostructural quaternary chalcogenidoantimonates(III) BaCuSbQ 3 (Q = S, Se): BaCuSbS 3 ( 1 ) and BaCuSbSe 3 ( 2 ) have been successfully synthesized through a facile hydrazine-hydrothermal method. Both two compounds crystallize in the orthorhombic space group and feature a three-dimensional (3D) channeled [Cu 2 Sb 2 Q 6 ] 4- framework, which is constructed by the distorted tetrahedral CuQ 4 and pyramid SbQ 3 units via vertex sharing. Both optical properties and theoretical studies show 1 and 2 are semiconductors with narrow band gaps. In addition, their photoelectrochemical properties have been investigated.
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RSC Advances
·
2016
·Vol. 6
·期 21
·17269-17279
·
IF 3.289
Chen Xiao Lin,Yi Zhi Zhuo,Ao Nan Lai,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A series of novel comb-shaped phenolphthalein-based poly(ether sulfone)s was synthesized for preparing anion exchange membranes (AEMs). Hexadecyldimethylamine with a long alkyl chain was used as the quaternization reagent to form a comb-shaped architecture of the copolymers. Due to the presence of a long alkyl side chain with hydrophobicity, the as-synthesized comb-shaped AEMs possess a self-anti-swelling property resulting in a low water uptake and swelling ratio. The PES-B100-C16 membrane exhibits excellent alkaline stability due to the presence of large volumetric β-alkyl chains linking to the cationic group that resist the attack of OH−, and retain available ionic conductivity in a 2 M KOH solution at 60 °C for 360 h. An open circuit voltage of the single cell reached 0.67 V, and the maximum power density was 43 mW cm2 at a current density of 125 mA cm−2 without optimization in a single H2/O2 alkaline fuel cell at 50 °C.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yafang Qi,Qingwen Tian,Yuena Meng,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Sixin Wu
The partial substitution of Cu+ with Ag+ into the host lattice of Cu2ZnSn(S,Se)4 thin films can reduce the open-circuit voltage deficit (Voc,deficit) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this paper, elemental Cu, Ag, Zn, Sn, S, and Se powders were dissolved in solvent mixture of 1,2-ethanedithiol (edtH2) and 1,2-ethylenediamine (en) and used for the formation of (Cu1–xAgx)2ZnSn(S,Se)4 (CAZTSSe) thin films with different Ag/(Ag + Cu) ratios. The key feature of this approach is that the impurity atoms can be absolutely excluded. Further results indicate that the variations of grain size, band gap, and depletion width of the CAZTSSe layer are generally determined by Ag substitution content. Benefiting from the Voc enhancement (∼50 mV), the power conversion efficiency is successfully increased from 7.39% (x = 0) to 10.36% (x = 3%), which is the highest efficiency of Ag substituted devices so far.
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RSC Advances
·
2016
·Vol. 6
·期 87
·84133-84138
·
IF 3.289
Feng Li,Jiashuang Luan,Shuling Zhang,Yuchao Luo,Yinlong Du,Cong Gao,Guibin Wang
A novel monomer containing tetraphenylethylene-(2,6-difluorophenyl)(4-(3-(4-1,2,2-triphenyl vinyl)phenoxy)propyl)phenyl)methanone (2F-TPE) was designed and synthesized by reaction of (4-(3-bromopropyl)phenyl)(2,6-difluorophenyl)methanone and 1-(4-hydroxyphenyl)-1,2,2-triphenylethene. A series of high fluorescence intensity poly(aryl ether ketone) copolymers containing tetraphenylethylene (TPE–PAEK) were prepared, which is the first report of preparing PAEK featuring tetraphenylethylene groups by polycondensation. The fluorescence and thermal properties of TPE–PAEK were characterized using fluorescence spectrophotometer, differential scanning calorimetry and thermogravimetric analysis respectively. The results indicated that tetraphenylethylene-based copolymers possessed high fluorescence intensity at a low concentration both in solids and in water/THF mixtures. TPE–PAEK still presented strong fluorescence intensity at elevated temperature up to 90 °C. In addition, TPE–PAEK possess excellent thermal stability.
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ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 18
·2923-2928
·
IF 6.453
Peiyuan Yao,Yunfeng Cui,Shanshan Yu,Yuncheng Du,Jinhui Feng,Qiaqing Wu,Dunming Zhu
An efficient multi-enzyme cascade reaction for the synthesis of ( R )- or ( S )-2-hydroxybutyric acid [( R )- or ( S )-2-HB] from l -threonine was developed by using recombinant Escherichia coli cells expressing separately or co-expressing l -threonine deaminase from Escherichia coli K-12 ( ilvA ), formate dehydrogenase (FDH) from Candida boidinii and l -lactate dehydrogenase ( l -LDH) from Oryctolagus cuniculus or d -lactate dehydrogenase ( d -LDH) from Staphylococcus epidermidis ATCC 12228. Up to 750 mM of l -threonine were completely transformed to ( R )- or ( S )-2-HB in optically pure form (>99% ee ) with high isolated yields. This one-pot multi-enzyme transformation provides a new practical method for the synthesis of these important optically pure compounds.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Mai Luo,Yifan Hua,Yiran Liang,Jiajun Han,Donghui Liu,Wenting Zhao,Peng Wang
A novel functionalized carbon dot has been synthesized by covalently linking β-cyclodextrin to the surface of N, S codoped carbon dots (β-CD-CDs). The characterization was confirmed by transmission electron microscopy , X-ray photoelectron spectroscopy, infrared spectra, ultraviolet-visible, and fluorescence emission spectra. On the basis of this carbon dot and (ferrocenylmethyl) trimethylammonium iodide (Fc + ), a photo-induced electron transfer (PET) fluorescent probe system was developed to determine the concentration of testosterone in water and identify testosterone in cell by fluorescence imaging as a visible biomarker. Under the optimum condition, the fluorescent intensity of the probe system linearly responded to the concentration of testosterone from 0 μM to 280 μM and the limit of detection was 0.51 μM. This probe system also performed well at determining testosterone in groundwater with average recoveries of testosterone ranging from 96% to 107% at spiking levels of 0.5–100 μM, and the relative standard deviation remained below 13%, which provided a reliable, rapid and easy method to determine testosterone in environmental water. Furthermore, the low cytotoxicity, high anti-interference ability, and excellent biocompatibility of β-CD-CDs made this probe system successfully used in cell fluorescence imaging to monitor levels of testosterone in the cytoplasm of cells with a promising application value in medical research.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shiying Zou,Changjun Hou,Huanbao Fa,Liang Zhang,Yi Ma,Liang Dong,Dan Li,Danqun Huo,Mei Yang
Carbon dots doped with nitrogen and sulfur (NSCDs) was prepared from l -cysteine with a hydrothermal method and applied to develop a fluorescent sensor to determine fluazinam . Characterizations of the NSCDs suggest that it provides abundant affinitive sites for recognizing fluazinam through molecular interactions including electrostatic, π-π stacking and hydrogen bonding interactions. Strong inner filter effect (IFE) leads fluazinam to quench the fluorescence of the NSCDs with high efficiency. Under optimized conditions, the fluorescent probe shows very good sensitivity and selectivity in a linear range from 0.05 μM to 4 μM, and the detection limit is calculated down to 10 nM. The proposed fluazinam sensor is demonstrated to be feasible for application in detecting this fungicide in soil and apple samples with satisfactory accuracy. Besides, NSCDs could also be used to fabricate visual paper-based testing stripes under a portable UV lamp with a detection limit as lower as 50 μM. The fluorescent material presented here provides a functional platform for simple yet facile in-field detection of fluazinam in related samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ning Li,Jiafeng Ma,Wenlong Wang,Qing Chang,Lei Liu,Caihong Hao,Huinian Zhang,Huayang Zhang,Shengliang Hu,Shaobin Wang
The layered chalcogenide ZnIn 2 S 4 (ZIS) exhibits photo-stability and a tunable band gap but is limited in photocatalytic applications, such as hydrogen (H 2 ) production, due to rapid carrier recombination and slow charge separation. To overcome these limitations, we have synthesized a ternary MoS 2 /ZIS/graphene quantum dots (GQDs) heterojunction, wherein MoS 2 and GQDs are strategically attached to ZIS interlaced nanoflakes, enhancing light absorption across the 500–1500 nm range. This heterojunction benefits from dual S-scheme interfaces between MoS 2 -ZIS and ZIS-GQDs, establishing directed internal electric fields (IEFs). These IEFs accelerate the transfer of photoinduced electrons from the conduction bands of MoS 2 and GQDs to the valence band of ZIS, promoting rapid recombination with holes and facilitating efficient catalytic reactions with plentiful photoinduced electrons stemmed from the conduction band of ZIS. As a result, the photocatalytic H 2 production rate of the MoS 2 /ZIS/GQDs heterojunction is measured at 21.63 mmol h −1 g −1 , marking an increase of 36.7 times over pure ZIS. This research provides valuable insights into designing novel heterojunctions for improved charge separation and transfer for solar energy conversion applications.
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npj Science of Food
·
2025
·Vol. 9
·期 1
·1-9
·
IF 7.8
Liu Kai,Lian Yinyin,Xie Xingyun,Gao Yuyang,Song Jiajia,Suo Huayi,Zhang Yu
This study investigates the impact of O. oeni on the quality of blueberry wine, employing various analytical methods to determine parameters such as alcohol content, antioxidant capacity, organic acids, amino acids, and volatile components. The results demonstrated that co-inoculation with O. oeni significantly decreased the titratable acidity of blueberry wine. Among the organic acids, the malic acid content of ST and SE groups decreased by (26.24 ± 1.24)% and (35.75 ± 4.02)%, respectively. The main consumed amino acids were aspartate, lysine, and arginine after co-inoculation with O. oeni . Additionally, co-inoculation with O. oeni significantly increased the content of medium-chain fatty acid ethyl esters, especially isoamyl acetate content. The antioxidant capacity of blueberry wine was significantly enhanced by co-inoculation with O. oeni , particularly in terms of measurement of 1,1-diphenyl-2-picryl-hydrazyl (DPPH) clearance. The findings of this study provide a solid basis for improving the quality of blueberry wine and promoting the growth of blueberry wine industry.
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