POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 4
·563-570
·
IF 2.247
Yi-Ling Huang,Jing Cao,Wei Hu,Sai Liang
Novel optically
active anionic initiators bearing a chiral oxazole substituent on the fluorene ring, ( S )-1-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-1-FIDH) and ( S )-2-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-2-FIDH), were prepared. Anionic homopolymerizations of achiral N -substituted maleimide (RMI) with the chiral initiators were investigated. The optically active polymers obtained were attributed to asymmetric induction of the chiral initiators. The very crowded chiral initiator Li-( S )-1-FIDH was found to play a better asymmetric induction role in the polymers than Li-( S )-2-FIDH. Anionic copolymerization of ( R )-(+)- N -1-phenylethyl maleimide and optically inactive RMI with Li-( S )-1-FIDH were also studied. © 2014 Society of Chemical Industry
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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
·
2023
·Vol. 41
·期 1
·55-61
·
IF 1.9
Feng Hua,Xin Du,Zhenyu Huang,Yiting Gu,Jianfeng Wen,Fuchi Liu,Junxue Chen,Tao Tang
Self-powered photodetectors (SPPDs) are attracting considerable publicity due to their superiority over conventional photodetectors (PDs) in terms of high sensitivity, fast response, and no need for an external power supply. Halide perovskites are much anticipated in SPPDs for their unusual photoelectronic properties. This work developed a Schottky junction ${{\rm CsPbBr}_3}/{\rm n} \text{-} {\rm Si}$ SPPD by growing stable all-inorganic ${{\rm CsPbBr}_3}$ microcrystals on an n-Si substrate using a solution method. At zero bias, such Schottky SPPD has a very weak dark current (0.3 pA), a wide linear dynamic range (LDR, 110 dB), a sizeable on–off ratio (${\gt}{{10}^3}$), and high detectivity (${1.05} \times {{10}^{11}}\;{\rm Jones}$). Through the research of this project, it is expected to obtain a way to prepare Schottky photodiodes with high stability and self-driving capability.
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ENERGY & FUELS
·
2014
·
IF 2.733
Zhenjian Jia,Hongyan Huang,Weixing Zhou,Fei Qi,Meirong Zeng
The pyrolysis mechanism of fuel under supercritical conditions is an important concern for developing regenerative cooling technology of advanced aircraft using hydrocarbon fuel as the primary coolant. n-Decane as a component of some jet fuels was studied at the temperature range from 773 to 943 K in a flow reactor under the pressure of 3, 4, and 5 MPa. Gas chromatograph/mass spectrometry was used to analyze the pyrolysis products, which were mainly alkanes from C1–C9 and alkenes from C2–C9. A kinetic model containing 164 species and 842 reactions has been developed and validated by the experimental results including the distributions of products and the chemical heat sink of fuel. The decomposition pathways of n-decane were illustrated through the reaction flux analysis. It is concluded that the C4–C9 alkanes are mainly generated by the recombinations of alkyls, while the small alkanes (C1–C3) are formed by H-abstraction reactions by C1–C3 alkyl radicals. The applicability at supercritical pressure and high fuel concentration condition of previous models was discussed, and the performance of the present model in reproducing the experimental data is reasonably good.
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ELECTROCHEMISTRY
·
2016
·Vol. 84
·期 12
·948-952
·
IF 0.791
Xiyun YANG,Ling RAN,Shenghai YANG
Anodic dissolution of zirconium in Bun4NBr-containing n-butanol solutions was investigated using cyclic voltammetry, linear sweep voltammetry and potentiostatic current–time transient and scanning electron microscopy (SEM). Zirconium did not exhibit active dissolution due to passivation in the potential region of 0.2 to 1.2 V vs. SCE. The zirconium dissolution in passive state was under mass transfer control. Pitting corrosion took place as a result of passivity breakdown by Br− anions and the typical steady-state pitting potential was between 1.55–1.60 V vs. SCE in n-butanol solutions containing 0.08 M Bun4NBr. SEM images confirmed the occurrence and the intensification of pits with an increase of potential. Increasing Bun4NBr concentration accelerated the pit nucleation and growth. The reaction order leading to pit nucleation process was 1.0 with respect to bromide anions. The dissolution of zirconium in n-butanol solution produced Zr(OC4H9)4.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Song Wei,Caichao Wan,Luyu Zhang,Xinyi Liu,Wenyan Tian,Jiahui Su,Wenjie Cheng,Yiqiang Wu
Transition-metal oxides are a class of promising pseudo-capacitive materials for high energy density supercapacitors, while their low intrinsic conductivity, limited electrochemical sites and remarkable volume expansion deteriorate the electrochemical properties. Herein, we develop a facile synchronization strategy to prepare a N-doped and oxygen vacancy-rich NiCo 2 O 4 microporous nanograss (N–Ov–NCO MiNG), with adjustable superficial nanoporous architecture and electronic structure. Because of the instructive synergy of doping, defect, and surface-engineering achieved by one-step plasma activation, the optimum electrode (N–Ov–NCO MiNG–15) for supercapacitors exhibits significantly enhanced electrochemical properties, like an ultra-high specific capacitance of 2986.25F g −1 at 1 mA cm −2 and outstanding cyclic stability with a capacitance retention of 96.5% after cycling for 12,000 times. In addition, an aqueous asymmetric supercapacitor (ASC) device, assembled with the N–Ov–NCO MiNG–15 as the cathode and commercial activated carbon (AC) as the anode, shows an extremely high energy density of 103.2 Wh kg −1 at the power density of 748.3 W kg −1 , superior to most state-of-the-art supercapacitors and thus exhibiting a great potential in practical applications.
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CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Jia Kong,Jiaxing Zhang,Yirui Zhang,Huanxin Xue,Xin Guo,Nan Wang,Ziyi Gao,Menghuan Sun,Yinqiang Xia,Yuefei Wang,Hao Ren,Peng Yang,Man Shing Wong
Amyloid β (Aβ) aggregates are a neuropathological hallmark of Alzheimer’s disease (AD). Despite being a prime therapeutic target, past Aβ-targeted trials have primarily focused on its hydrophobic core, yielding unsatisfactory results. In this study, we aligned the structural features of Aβ42 filaments and found that the hydrophobic core and C-terminal region show notable similarities, and the N-terminal region exhibits considerable disorder. Through residue substitution studies, we identified the His13-His14 motif at the disorder–order boundary as particularly effective in mitigating Aβ42’s fibrillation pathway and neurotoxicity, alongside the Phe19-Phe20 hydrophobic core, presenting a promising target for therapeutic intervention. We then designed a series of peptide mimetics based on these Aβ features. Among them, peptide mimetic III, with the sequence of Phe-His-His, exhibited an assembly of antiparallel β-sheet structures primarily driven by hydrogen bonding, showcasing favorable rheological properties and biosafety. Interestingly, mimetic III predominantly patches the N-terminal region of Aβ42 fibrils through hydrogen bond-dominated interactions, effectively modulating aggregation and neurotoxicity in a “like-interacts-with-like” manner. Furthermore, mimetic III eliminates the risk of Aβ42 aggregating into neurotoxic intermediates, rescuing both human and mouse-derived neuronal cells from Aβ42-induced toxicity. Our study demonstrated that peptide mimetics targeting the N-terminal region of Aβ42 is a promising alternative for modulating amyloidosis-related neurotoxicity.
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PubMed
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LANGMUIR
·
2025
·
IF 3.9
Junsheng Wang,Gege He,Jinke Shen,Xiaozhen Lv,Hongyu Mi,Shun Lu
Transition metal and nitrogen codoped graphitic carbon materials with Co–N bonds serve as key non-noble-metal catalysts for the oxygen evolution reaction (OER). To enhance catalytic efficiency, we explore the anchoring of Co–N bonds on nitrogen-doped graphitic carbon (NC) substrates with varied phosphorus content. The catalyst is synthesized through a straightforward sintering and phosphating process of ZIF@DCA in a tube furnace. X-ray photoelectron spectroscopy (XPS) demonstrated that the Co–N bonds effectively formed an efficient charge transfer channel, removing the barrier that separated the Co–N active site from the work electrode surface. Phosphorus is uniformly distributed across the Co–N substrate, ensuring the exposure of most Co–N active sites during the electrochemical reaction. With favorable structural and electronic attributes, P/Co–N-2 showcases the lowest overpotentials at 10 and 300 mA cm–2, which are 200 and 300 mV, respectively. Additionally, it demonstrates stable performance over 100 h in 1 M KOH, outperforming other similar materials and RuO2. This study offers critical insights for the rational design of Co–N structures, exploring the interplay between structure, composition, and activity in electrochemical reactions.
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Chem
·
2024
·
IF 19.1
Xiaoran Zhang,Xiaorong Zhu,Shuowen Bo,Chen Chen,Qingfeng Zhai,Shuang Li,Xiaojin Tu,Jianyun Zheng,Dongdong Wang,Xiaoxiao Wei,Wei Chen,Tehua Wang,Yafei Li,Qinghua Liu,San Ping Jiang,Liming Dai,Shuangyin Wang
Electrocatalysis offers a sustainable approach to artificial nitrogen fixation yet faces numerous challenges. Selective synthesis of nitrogen-containing compounds shows promise but needs significant improvement. Herein, we demonstrate selective ammonia and urea synthesis via co-electrolysis with CO 2 . High CO binding energy on Re-Mn catalysts leads to the formation of ∗C species, which serve as electron reservoirs to enhance N 2 activation for C-N coupling (N 2 + ∗C → ∗CN 2 ), followed by C-N dissociation. This results in ammonia production with a yield rate of 48.9 ± 2.4 mg g −1 h −1 and an N-selectivity of 98.4%. In contrast, Zn-Mn sites, characterized by low CO binding, facilitate the migration of CO and its coupling with adsorbed N 2 (CO + ∗N=N∗ → ∗NCON∗). Subsequent hydrogenations of ∗NCON∗ promote urea synthesis with an N-selectivity of 89.1%. Utilizing Janus coupling with two C-N pathways aims to meet energy, agriculture, and chemical industry demands. We realized the selective synthesis of ammonia and urea, respectively, in one electrocatalytic system for the first time by Janus coupling with two distinguishable C-N coupling paths from N 2 and CO 2 .
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Boyu Wang,Yani Huo,Cheng Chen,Xiao-Ye Wang,Chuancheng Jia,Jinying Wang,Xuefeng Guo
Achieving dynamic control over stereostructures and electronic properties of rigid molecules remains a significant challenge due to the delicate balance between stability and flexibility. Here, the construction of butterfly-shaped molecular junctions stabilized by moderate-strength boron-nitrogen (B←N) coordination between boraacenes and pyridines is reported. By leveraging the pivot-like flexibility of B←N bonds, molecular conductance switching with on/off ratios exceeding 100 is achieved through force-driven dynamic transitions between distinct stacking conformations. Single-molecule electrical measurements combined with first-principle calculations identify distinct charge transport mechanisms—through-space and through-bond—associated with the butterfly-wing open and closed configurations. Furthermore, external factors like electric fields and substituent effects modulate π – π interactions and charge transport properties. The introduction of destructive quantum interference effects can be achieved by replacing molecular units. The findings demonstrate that B←N coordination serves as a dynamically tunable linkage, offering a pathway to design molecular platforms with multifunctional units, customized stereo-conformations, and quantum effects.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fenghao Yu,Chaoxin Qiu,Cong Xiao,Yanxin Du,Lin Lai,Wei Ren,Wei Li,Liting Jiang,Xiaohua Luo,Shengcan Ma
At present, Ag-based thermoelectric materials have received extensive attention and have demonstrated excellent performance in related device application. Among them, AgBiSe 2 is a lead-free thermoelectric material that exhibits significant n -type doping characteristics. It has been previously reported that R Cl 3 -doping ( R denotes the rare earth elements) has achieved excellent results in some n -type thermoelectric materials. However, there is still a lack of systematic research on the effect of R Cl 3 doping on AgBiSe 2 based materials. In this work, n -type AgBiSe 1.98 polycrystalline materials doped with CeCl 3 (0.5–2 mol%) are successfully synthesized by the melting method in combination with spark plasma sintering (SPS) technique. Compared with AgBiSe 2 , the CeCl 3 -doped AgBiSe 1.98 samples have achieved a significant increase in thermoelectric figure of merit ( ZT ) value, which should be attributed to the higher power factor ( PF = S 2 σ ) and inherently low thermal conductivity. Specifically, a large ZT max of ∼ 0.65 is achieved at 733 K in the 2 mol% CeCl 3 -doped AgBiSe 1.98 sample, which shows an increase of 41 %. This study demonstrates that CeCl 3 -doping, as a novel strategy that can improve simultaneously n H and m *, reveals excellent optimization effects in the thermoelectric performance regulation of AgBiSe 2 -based materials.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Rui Liu,Jin-le Lan,Xing Tan,Yao-chun Liu,Guang-kun Ren,Chan Liu,Zhi-fang Zhou,Ce-wen Nan,Yuan-hua Lin
The Bi 2 O 2 Se-based compounds with an intrinsically low thermal conductivity and relatively high Seebeck coefficient are good candidates for thermoelectric application. However, the low electrical conductivity resulted from carrier concentration of only 10 15 cm −3 for pristine material, which is too low for optimized thermoelectrics. As a result, the carrier concentration optimization of Bi 2 O 2 Se is important and useful to achieve higher power factor. In this work, the effect of Ge-doping at the Bi site has been investigated systematically, with expectations of carrier concentration optimization. It is found that Ge doping is an efficient method to increase carrier concentration. Due to the largely increased carrier concentration via Ge doping, the room temperature electrical conductivity rises rapidly from 0.03 S/cm in pristine sample to 133 S/cm in x = 0.08 sample. Combined with the intrinsically low thermal conductivity , a maximum ZT value of 0.30 has been achieved at 823 K for Bi 1.92 Ge 0.08 O 2 Se, which is the highest ZT value for Bi 2 O 2 Se-based thermoelectric materials .
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ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Tian Xu,Guangjin Wang,Cong Liang,Mu Pan
Nitrogen shows a positive influence on the ORR activity of certain catalysts, such as N-doped carbon and N-doped ZrO 2 . In this paper, we report a method to dope nitrogen into La 2 Zr 2 O 7 nanoparticles by the sol-gel process combined with ammonolysis. XPS results indicate that the nitrogen content in La 2 Zr 2 O 7 is approximately 0.92 at.%. Compared to the ORR activity of La 2 Zr 2 O 7 , ORR activity of the N-doped La 2 Zr 2 O 7 is considerably enhanced. Density functional theory (DFT) calculations indicate that the band gap is reduced in N-doped La 2 Zr 2 O 7 , which may be one of the factors that contribute to the improvement.
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