Journal of Physical Chemistry C
·
2025
·
IF 3.2
Xiang Chen,Shaohua Chen,Pengxin Liu,Chaodan Pu
We report the efficient C–C coupling between benzyl alcohol and benzaldehyde to hydrobenzoin using CdSe/CdS quantum dots as visible-light photocatalysts and sodium oxide as a cocatalyst. The optimized conditions resulted in a reaction with a selectivity of hydrobenzoin >95%, an apparent quantum yield of 23.6% under the excitation by 520 nm LED, and a turnover frequency of 56.8 mmol g–1 h–1. Reactant concentration-dependent experiments demonstrated that benzaldehyde can process fast proton-coupled electron transfer, improving the utilization of photogenerated electrons. Photoluminescence quenching experiments and reactions with deuterated benzaldehyde confirmed that due to the in situ produced hydrogen ions, the hydroxymethyl radicals would process efficient reverse conversion from hydroxymethyl radicals to benzyl alcohol, resulting in noneffective charge transfer. Formation of sodium benzyloxide can eliminate the in situ produced hydrogen ions around the hydroxymethyl radical, suppressing this reverse conversion and improving the utilization efficiency of transferred holes and electrons.
研究领域:
化学
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材料科学
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DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 10
·4393
·
IF 2.679
Yongbo Wu,Linfeng Lan,Penghui He,Yilong Lin,Caihao Deng,Siting Chen,Junbiao Peng
Over the past decade, there have been many reports on solution-processed oxide thin-film transistors (TFTs) with high mobility (even >100 cm2V−1s−1). However, the capacitance uncertainty of the solution-processed oxide gate dielectrics leads to serious overestimation of the mobility. Here, solution-processed AlOxdielectrics are investigated systematically, and the effect of mobile ions on the frequency-dependent capacitance of the solution-processed AlOxdielectrics is also studied. It was found that the capacitance of the AlOxdepends on the frequency seriously when the annealing temperature is lower than 300 °C, and the water treatment causes more seriously frequency-dependent capacitance. The strong frequency-dependent capacitance of the AlOxannealed at 250 or 300 °C is attributed to relaxation polarization of the weakly bound ions in the incompletely decomposed AlOxfilms. The water treatment introduces a large number of protons (H+) that would migrate to the ITO/AlOxinterface under a certain electric field and form an electric double layer (EDL) that has ultrahigh capacitance at low frequency.Keywords:Aluminum oxide;dielectric;thin-film transistor;solution-processed;oxide semiconductor
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2022
·Vol. 33
·期 1
·91-101
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IF 2.525
Li Zhigang,Zhao Bing,Kan Wei,Bu Fanqiang,Qi Xin,Wang Liyan,Song Bo,Ding Limin
A reactive fluorescent “turn-on” probe ( di-PIP ) with imine-linked dual phenanthro[9,10- d ]imidazole luminophore have been conveniently prepared as an Al 3+ and H + dual functional receptor. di-PIP displayed high selectivity and sensitivity towards Al 3+ ion in DMF/HEPES accompanied by fluorescence blue-shift and a good linear relationship as well as a low detection limit of 30.5 nmol·L –1 , which can root from the synergetic functions of the decomposition reaction of di-PIP promoted by acidic Al 3+ and the coordination effect between decomposition product and Al 3+ . Intriguingly, it was found that hydrogen ion H + can be sufficient for simulating the fluorescence enhancing of di-PIP . 1 H NMR titration and MS analyses for elucidation of the intermediate structure further revealed that the acid-triggered decomposition reaction resulted in the rapid, and sensitive sensing to Al 3+ and H + . In addition, the probe di-PIP could be successfully applied to the detection of Al 3+ in real water samples, and also utilized to visualize Al 3+ and H + in the living cells.
研究领域:
分析化学
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生物医学
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DOI
PubMed
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2019
·Vol. 54
·期 3
·239-249
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IF 2.267
Hua-Ming Xiao,Xian Wang,Xing Yang,Feng Zheng,Yu-Qi Feng
Hydralazine has been widely employed in the development of drugs, derivatization reagents, and ligands. In the present work, we reported a new type of dehydrogenated ion [M − H] + that was produced from the hydralazine derivative of hexanal in electrospray ionization mass spectrometry (ESI-MS). The formation of [M − H] + ions in the ESI-MS was found to be independent on the mobile phase composition of the liquid chromatography and ESI source parameters. A series of hydralazine derivatives of aldehyde were investigated to confirm this phenomenon. The results showed that hydralazine derivatives of aldehydes that contained an sp 3 hybridization carbon with a hydrogen at the α-position of aldehydes could form the unexpected [M − H] + ions, whereas hydralazine derivative of acetone could only generate [M + H] + ion in the ESI-MS. We proposed the possible formation mechanism of [M − H] + ion for the hydralazine derivatives of aldehydes: the [M − H] + ion was possibly formed by the loss a hydrogen molecule (H 2 ) from the protonated ion [M + H] + . The results obtained from density functional theory (DFT) calculations supported this proposed formation mechanism of [M − H] + ion.
研究领域:
分析化学
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药物化学
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计算化学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2022
·
IF 4.331
Xiangli Wen,Pengpeng Bai,Yonggang Meng,Liran Ma,Yu Tian
Ceramic friction pairs lubricated with chlorinated-phenyl and methyl-terminated silicone oil (CPSO) systems have potential applications in the aerospace industry. In this study, the effects of the running-in process and temperature on the lubricating performance of CPSO were investigated. The superlubricity of Si3N4/sapphire lubricated with CPSO was realized at >190 °C after H+-ion running-in. The mechanism of this high-temperature superlubricity was investigated by determining the stable adsorption configurations and adsorption energies of CPSO on different surfaces using density functional theory calculations. Compared with that on the Si3N4 surface, the adsorption capacity of CPSO on the hydroxylated SiO2 surface generated by H+-ion running-in increased, whereas the steric hindrance decreased. The viscosity–temperature curve of CPSO was measured, wherein the viscosity and pressure–viscosity coefficient of CPSO considerably decreased with increasing temperature, leading to high-temperature superlubricity in a wide speed/load range. This is the first paper to report oil-based superlubricity at temperatures of 190 °C, or even higher-temperature conditions. Furthermore, it provides guidance for the use of ceramic–CPSO systems in high-temperature conditions, including in the aerospace industry.
研究领域:
材料科学
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摩擦学
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航空航天工程
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Wenjuan Han,Minhan Li,Yuanyuan Ma,Jianping Yang
Organic materials are promising materials for anode electrodes in aqueous hydronium-ion battery due to their flexible of structural, the abundant resources and the tunable electrochemical properties. However, the dissolution of the organic materials in the electrolytes is still inevitable. Polyimide (PI) possesses stable aromatic core, π–π stacking interaction, and increased conjugated system , which are favorable for fast charge transfer kinetics and stable cycling performance of aqueous hydronium-ion battery. Here, the synthesis PI by 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) and urea is reported. In this work, the capacity of full cell can retain about 67.9% at the current of 5 A•g −1 after charging-discharging over 5000 cycles. Therefore, our studies are suggesting a potential feasibility of these NTCDA-based carbonyl PI as promising organic anode materials for aqueous hydronium-ion battery.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Hui Kong,Wei Zhang,Jia Yao,Chao Li,Renfei Lu,Zhen Guo,Jinze Li,Chuanyu Li,Yingxue Li,Chiyu Zhang,Lianqun Zhou
Development of a simple, sensitive and specific method for HIV-1 assay is demanded. In some emergency situations, a portable reverse transcription loop-mediated isothermal amplification (RT-LAMP) platform is necessary. A novel hydrogen ion-selective RT-LAMP (H + -RT-LAMP) sensor was developed for highly sensitive HIV-1 using hydrogen ion concentration as a signal producing compound. The H + -RT-LAMP sensor was based on screen-printed with carbon-doped graphene conductive layer, carbon nanotubes (CNTs) solid electrolyte layer, and reference electrode KCl functional layer, which provided superior electrical signals, high sensitivity and stability for HIV-1 detection. The rate of hydrogen ion production was related to the viral load (VL) during the amplification of HIV-1. The sensitive HIV-1 RNA detection range was achieved from 0 copies/μL to 10 5 copies/μL. The proposed H + -RT-LAMP sensor was applied to detect HIV-1 RNA in real human serum. 57 samples were detected and satisfactory results were obtained. Compared with commercial instruments, the detection results of H + -RT-LAMP sensor demonstrated a perfect concordance rate of 96.5 %, and the limit of detection (LOD) for the clinical samples was 10 copies per tube. Time to get the result is from 10 min to 25 min. Therefore, the proposed H + -RT-LAMP sensor was particularly suitable as a point-of-care device for the on-site detection of HIV-1.
研究领域:
分子生物学
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医学检验
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生物传感器
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Shengnan Zhong,Lina Tian,Lixin Yi,Yifan Liu,Weiguo Cheng,Yibo Wang,Yunong Li
Among various strategies for CO 2 chemical fixation, the CO 2 cycloaddition with epoxides is one of the most promising and efficient approaches, in which ionic liquid (ILs) is a typical relatively environmentally friendly catalyst and medium. However, ILs decomposition and catalytic stability have not been in-depth investigated, and the structure-activity relationship of cations and anions has remained obscure, which would affect the understanding of catalytic behavior and catalyst loss, and limit the theoretical research and industrial application in CO 2 utilization. Therefore, based on a variety of phosphonium ILs we have designed and synthesized for CO 2 cycloaddition, the structure-activity relationship, steric hindrance and electronic effect of various anions and cations have been systematically studied in main and side reactions. Especially, a regulation strategy of cationic flexible steric hindrance and anionic electron effect have been developed to improve both ILs’ activity and stability. Remarkably, the synergistic action of electron-donating effect, hydrogen bond and decreased acidity from flexible steric alkyl groups result in the spatial shielding of cation center and enhancement of the Br's leaving. Consequently, the quaternary phosphonium ILs with asymmetric flexible steric hindrance exhibit the optimal performance, showing propylene oxide (PO) conversion of 99.15% and propylene carbonate (PC) yield of 98.86%, which can efficiently decrease the formation of phosphine oxide, avoiding the decomposition of ILs. This discovery provides a new idea for developing stable and efficient CO 2 fixation system in sustainable industry.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
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IF 7.2
Jiaxin Pan,Xiaowei Huang,Longsheng Zhao,Depeng Liu,Ting'an Zhang,Zongyu Feng
The investigation of the leaching mechanisms of ion adsorption rare earth ores (IAREO) using MgSO 4 is significantly hindered by the complex mineral composition. In this study, the direct analogue of the natural IAREO sample, Y-kaolinite, was prepared and used to investigate the leaching mechanisms of rare earths from kaolinite under varying initial MgSO 4 concentrations and pH. The results of X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray absorption fine structure (XAFS) data indicate that the Y-kaolinite prepared exhibits a similar composition, micromorphology and coordination structure with nature IAREO sample. The coordination number and bond length of Y–O are 9.2±1.4 and 0.23±0.010 nm, respectively. The results of batch desorption experiments and sequential chemical extractions show that lowering the initial pH from 5.00 to 2.00 significantly enhances the desorption of rare earths from Y-kaolinite. Specifically, the additional desorption amounts are 0.52 mmol/kg for inorganic hydroxy Y (Hy-Y) and 0.40 mmol/kg for ion-exchangeable Y (Ex-Y). The enhancement mechanism was revealed by density functional theory (DFT) and Visual MINTEQ. The desorption of Hy-Y and Ex-Y is directly and indirectly enhanced by hydrogen ions, respectively. The desorption of Hy-Y is consistent with the dissolution behavior of the Y hydroxyl compound at lower pH. The desorption of Ex-Y is promoted by [Al(H 2 O) 6 ] 3+ released from Hy-Al by hydrogen ions. Additionally, when the concentration of MgSO 4 is 100 mmol/L and initial pH is 2.00, the desorption rate of rare earths is 87.1%, while the adsorption rate of magnesium is 63.1% and the stoichiometry ratio of Y 3+ to Mg 2+ is 1.04, which indicates that adequate hydrogen ions reduce the consumption of MgSO 4 and enhance the leaching of rare earth. These finding provide valuable insights into optimizing the selective leaching of rare earths from IAREO.
研究领域:
地球科学
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矿物加工
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环境化学
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yongkang Zhang,Heyi Xia,Qiaochu Yang,Zhiyuan Xu,Wenbo Wang,Ziyu Yuan,Zesen Li,Shifang Cao,Bai-Ou Guan,Ling Qiu,Yang Ran
Hydrovoltaic is an emerging technology that aims to harvest energy from water flow and evaporation, in which the plasmonic hydrogen ions are generated by the interaction between water and hydrovoltaic device. However, the volume of the water sample for the interaction is usually ultra-small due to the compact size of hydrovoltaic device, making the quantification and characterization of the hydrogen ions in such water sample an elusive goal. To address this issue, a miniature fiber-optic pH probe is proposed using a unilaterally tapered-microfiber Bragg grating. The microfiber Bragg grating has an intrinsic Bragg reflection signal with a narrow linewidth. The fiber probe is functionalized by coating the sodium alginate, which can respond to the variation of pH mediated by the alteration of the hydrophilicity. The rigidity and robustness of microfiber Bragg grating facilitates the encapsulation of the sensor into a sampling capillary, allowing for the detection of trace aqueous sample less than 2 μL. The pH sensitivity of the tapered-μFBG-based sensor is 62.8 p.m./pH (R 2 = 0.995) with a limit resolution of 0.096 pH. The sensor performed a practical application in the monitoring and characterization of the hydrovoltaic microdevice, which can generate microcurrent as soaked in the water. This work demonstrates a promising technology in the fields of materials, energy, biology and medicine, in which the detection of the microsamples is inevitable.
研究领域:
材料科学
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能源技术
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生物学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2021
·Vol. 42
·期 3
·452-458
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IF 0.969
Dongbo Mi,Jinhaojie Cui,Siliang Kuang,Xiaofeng Dong,Haiyan Lu
Water radical cations, (H 2 O) n +• , have attracted considerable attention owing to their potential practical applications in analytical chemistry, structural chemistry, radiotherapy, and radiochemistry. Recently, atmospheric pressure chemical ionization has emerged as a versatile method for direct mass spectrometric analysis. Usually, H 3 O + is the major proton donor during ionization and only the pseudo molecular ion peaks, instead of molecular ions are detected. In this work, (H 2 O) 2 +• ions with high oxidizability and reactivity were generated using hydrothermally grown TiO 2 nanoneedle arrays in combination with a linear ion trap mass spectrometer under low operating voltage and applied to the direct mass spectrometric analysis of a mixture of volatile aromatic hydrocarbons. (H 2 O) 2 +• ions were generated with a high absolute ion current of up to 1.07 × 10 5 counts/s at atmospheric pressure. Using the generated (H 2 O) 2 +• as the primary ion permitted the tandem mass spectrometric analysis of a mixed vapor sample of aromatic hydrocarbons.
研究领域:
分析化学
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质谱学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2011
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IF 2.13
Xin Tian,Zhengping Dong,Yifan Huang,Jiantai Ma
In this work, molecular logic element modified multifunctional silica nanoparticles having high magnetization have been successfully prepared. These multifunctional nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), Elementary analysis, X-ray powder diffraction (XRD) and Vibrating sample magnetometer (VSM). The characterization datum indicated that the organic ligand was successfully grafted on the surface of the magnetic silica nanoparticles . The fluorescent changes of the hybrid material upon the addition of cations (H + , F − and their mixture) is utilized as an INHIBIT logic gate at the molecular level, using the fluorescence intensity signal as output.
研究领域:
纳米医学
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生物传感器
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分子诊断
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化学生物学
·
智能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）