JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2024
·
IF 2
Xiaodong Shen,Yinde Zhang,Yanxia Li,Long Shen,Jialin Shi,Yang Li
Phase equilibria of carbon dioxide (CO2) hydrate in aqueous solutions of N-methyldiethanolamine (MDEA) at four different mass fractions (5, 10, 15, and 25 wt %) in the temperature range of 274.01 to 281.93 K and pressure range of 1.79 to 4.34 MPa were experimentally investigated by adopting an isochoric pressure search method. The reliability and accuracy of our experimental apparatus and method were examined by comparing the measured data with published ones. The enthalpy of CO2 hydrate dissociation was calculated by the Clausius–Clapeyron equation. The experimental results showed that MDEA acted as a thermodynamic inhibitor which could suppress the equilibrium line of CO2 hydrate to lower temperatures or higher pressures. The thermodynamic inhibition effect was enhanced after increasing the mass fraction. However, it was weaker than the conventional thermodynamic inhibitors of ethylene glycol (EG) and sodium chloride (NaCl). MDEA had synergistic inhibition effects with EG and NaCl, as their mixtures had stronger thermodynamic inhibition performance. The average enthalpies of CO2 hydrate dissociation in the presence of MDEA (5 to 25 wt %) were found to be in the range of 67.562 to 80.776 kJ·mol–1, which were very close to that of pure water. The research results have theoretical guidance for the flow assurance of natural gases.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Tingting Xiang,Qingchao Zhu,Tanyu Zhou,Chenglong Chen,Ruibo Wang,Tieyu Hu,Bing Li,Ziwei Xu,Juan Yang
Graphical Fe−N−C catalysts, doped with phosphorus, show improved ORR activity. Fe-NPC catalyst exhibits high metal loading, excellent ORR performance (onset potential of 1.00 V, half-wave potential of 0.864 V), and promising application in Zn-air batteries (758.8 mAh g −1 Zn ). DFT calculations reveal that phosphorus enhances O 2 activation and reduces the energy barrier for the rate-determining step. Atomically dispersed iron and nitrogen co-doped carbon materials (Fe−N−C) represent promising non-precious metal catalysts for the oxygen reduction reaction (ORR), offering potential alternatives to noble metal-based benchmarks. In our study, we investigated the influence of phosphorus doping on the catalytic activity of Fe−N−C. The experimental research demonstrate that the doping of phosphorus significantly enhances the ORR activity. Specifically, the resulting Fe-NPC exhibits high metal loading and excellent ORR activity in 0.1 M KOH with an onset potential of 1.00 V and a half-wave potential of 0.864 V. Density functional theory (DFT) simulations reveal that phosphorus improves the electrocatalytic activity by activating O2 molecules and reducing the energy barrier (the hydrogenation reaction *OH→H2O) of the rate-determining step. Furthermore, Fe-NPC exhibits promising application prospects as an air cathode in Zn-air batteries, delivering a high maximum discharge power density of 180.3 mW cm −2 and outstanding discharge specific capacity (758.8 mAh g −1 Zn ) at a discharge current density of 10 mA cm −2 .
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PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiaoqiang Xue,Yangjing Chen,Xuepei Miao,Jian Liu,Yi Ding,Yuheng Zhang,Yunkai Sun,Wenyan Huang,Qimin Jiang,Hongting Pu
Environmentally sensitive polymer materials exhibit diverse properties due to their ability to respond to external environmental changes such as light, temperature, pH, and et al. These responses lead to corresponding alterations in their structure or state, resulting in unexpected performance. In this study, azo pyridine groups were introduced into the end groups and side chains of PNIPAM to synthesize two distinct polymer structures (PNIPAM-AZO and P (NIPAM- co -PAZO- co -OEGMA). This integration enables the polymers to respond to multiple stimuli, including temperature, light, pH, and gas (CO 2 ). A comprehensive investigation of the properties of these multi-responsive polymer materials was conducted. The findings reveal that the presence of azo pyridine units enables both polymers to modulate the (lower critical solution temperature) LCST of PNIPAM through UV, pH, and CO 2 , with a maximum temperature adjustment of 13 °C when CO 2 is introduced. This modulation range is influenced by the azo pyridine content in the polymer. Notably, when azo pyridine is present only at the polymer end group, the maximum LCST regulation range is limited to 3 °C. Moreover, the LCST of the two polymers can also be adjusted by pH. In the presence of carbonate ions, the protonation of azo pyridine by carbonic acid increases the solubility of the polymer and enhances the LCST. Introducing argon gas removes CO 2 , thereby restoring the polymer's solubility and LCST to their neutral condition levels. By alternately introducing CO 2 and argon gas, the LCST of the polymer exhibits cyclic changes.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Chen Wang,Haobo Yan,Songlin Li,Yuesen Shi,Mingluo Du,Pengfei Cheng
Morphology-engineered ternary metal oxides have gained increasing attention for their potential in precise and sensitive gas detection. In this work, different Zn₂SnO₄ (ZTO) nanostructures were synthesized via a simple alkali-assisted hydrothermal route. The ZTO microcrystals with a polyhedral shape exhibited the largest specific surface area and content of surface-active oxygen species than cubic and plate-like counterparts. Additionally, the gas sensor based on the ZTO-polyhedron demonstrated outstanding n-butanol sensitivity, along with rapid response and recovery times, good repeatability and long-term stability. Furthermore, density functional theory (DFT) simulations were conducted to investigate the adsorption behavior of n-butanol on different crystallographic facets of ZTO to further elucidate the mechanism of ZTO-Polyhedron for the enhanced performance toward n-butanol. The results highlight the significant potential of this type of sensor for industrial and environmental detection applications and emphasize the critical role of nanostructural design in optimizing sensor performance.
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CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Bangjian Liu,Hong Yang,Limin Ren,Zhaoyang Song,Quanjie Liu,Shuandi Hou,Anfeng Zhang,Xinwen Guo
In this study, a rapid synthesis of ZSM-50 zeolites is achieved by a two-step aging–crystallization hydrothermal method. By optimizing the temperature/time for aging (393 K/48 h) and crystallization (423 K/72 h), the synthesis time for obtaining pure-phase ZSM-50 zeolites has been significantly shortened to 4 days from typically weeks. The gel compositions to form pure-phase ZSM-50 have also been mapped out in the ternary composition diagram of 5Al2O3/SiO2–OSDA/SiO2–OH–/SiO2 under the optimized aging–crystallization conditions. Furthermore, three ZSM-50 samples are synthesized using different gel compositions and/or crystallization conditions. The samples have different acidity characteristics and average crystal sizes from 5 to 17 μm. As catalysts for n-heptane hydroisomerization, the three Pt-loaded ZSM-50 catalysts deliver the maximum iso-heptane yield directly correlated to their surface weak Brönsted acid sites on the external surface. The ZSM-50 (5 μm) catalyst has a superior catalytic activity, achieving a maximum iso-heptane yield of 71.4% at 543 K, along with a high fraction of multibranched isomers of 29.1%. This study highlights the pivotal role of particle size in modulating acid properties and pore accessibility in ZSM-50 and offers a facile strategy for designing effective bifunctional catalysts for n-alkane isomerization.
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高影响因子
Results in Chemistry
·
2025
·
IF 4.2
Zhengyue Zhu,Jiancong Ye,Tao Ye,Jialong Zou,Junjie Ye,Qi Li,Yan Liu
The effects of different additions of dimethyl sulfoxide (DMSO) to poly(N-isopropyl acrylamide)/sodium alginate hydrogels(D-PNIPAM/SA) on the desalination of saline soil were investigated in this study. The effects of liquid absorption rate(LAR) of the D-PNIPAM/SA by temperature, NaCl concentration, and DMSO addition amount were studied. And the deswelling rate(DR) tests of different DMSO addition amounts were also investigated. The LAR decreased significantly with the temperature increase from 20 °C to 35 °C and with the increase of NaCl concentration from 0.597 g/L to 7.714 g/L. The LAR increased while the DR decreased with the DMSO addition increased from 0 ml to 3.5 ml. The results indicated that the optimal addition of the DMSO was 3.5 ml. In this addition, the D-PNIPAM/SA was observed in its best form by an Ultra-depth of field 3D microscope, and the phase transition temperature was reduced to −2.95 °C. In NaCl solution, DMSO was added from 0 ml to 3.5 ml, and the D-PNIPAM/SA absorption rate increased from 6.60 g/g to 12.41 g/g.In the desalination of saline soil study, the desalination rate of the D-PNIPAM/SA was reached 88.609 % in the saline soil solution test, and the desalination rate reached 94.765 % in the dry saline soil test.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Guoliang Lv,Zihang Huang,Li Qin,Pengwei Tan,Yuanyuan Luo,Guotao Duan
The exceptional specificity of biological olfactory sensing has motivated efforts to tackle the persistent challenge of low selectivity in chemiresistive-type gas sensors. In this paper, we draw inspiration from biological recognition mechanisms for organophosphonates and develop n-type hydroxylated reduced graphene oxide (HRGO) as a molecular olfactory sensor for the sarin surrogate, methyl dimethylphosphonate (DMMP). HRGO is synthesized through a controlled selective reduction of graphene oxide, converting most of the oxygen-containing groups into hydroxyl groups. The corresponding sensor demonstrates ultrahigh selectivity for DMMP at room temperature, with a fast response time of approximately 5 seconds and a detection limit as low as 5 ppm. Furthermore, we grafted calix[6]arene onto HRGO via van der Waals forces, significantly enhancing the Schottky contact between HRGO and the Au electrode, which in turn improved the sensor's stability. Additionally, the introduction of the hydrophobic aromatic rings in calix[6]arene boosted the sensor's humidity resistance of low-concentration detection resolution. A possible bionic sensing mechanism was then proposed, in which DMMP was first adsorbed by the electron-rich conjugated benzene rings of n-type HRGO, followed by phosphonylation at the hydroxyl sites. This work offers valuable insights into the field of molecular olfactory sensing as well as artificial olfaction.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 11
·2565
·
IF 3.426
Yiting Li,Lihui Zhang,Youhong Shi,Jialing Huang,Yaqiong Yang,Dengming Ming
Silicon nanocrystals (Si NCs) have received surging interest as a type of quantum dot (QD) due to the availability of silicon in nature, tunable fluorescence emission properties and excellent biocompatibility. More importantly, compared with many group II–VI and III–V based QDs, they have low toxicity. Here, thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm)-functional Si NCs were firstly prepared for thermoresponsive detection of cancer cells. Si NCs were prepared under normal pressure with excellent water solubility. Then folic acid was bonded to the silicon nanocrystals through the reaction of amino and carboxyl groups for specific recognition of cancer cells. The folic-acid-modified silicon crystals (Si NCs-FA) could be modified by a one-pot copolymerization process into PNIPAAm nanospheres during the monomer polymerization process (i.e., Si NCs-FA-PNIPAAm) just by controlling the temperature below the lower critical solution temperature (LCST) and above the LCST. The results showed that the Si-FA-PNIAAm nanospheres exhibited not only reversible temperature-responsive on-off fluorescence properties, but also can be used as temperature indicators in cancer cells.Keywords:silicon nanocrystals;PNIPAAm;fluorescent imaging;thermoresponsive
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhiguo Yang,Xingtai Chen,Qiuying Chen,Jiayi Qu,Yujun Guo,Kaiwen Zhou,Tianren Wang,Davoud Dastan,Xiaoning Wang,Feifei Wang,Xiaoming Tan,Xi-Tao Yin,Xiaoguang Ma
In this work, In 2 O 3 nanospheres were synthesized using urea as a carbon template and modified with Co ions. The synthesized materials were characterized using various instruments to obtain information about the elemental composition and morphology of the materials. The results showed that Co ions replaced the lattice position of In ions and synthesized nanospheres aggregated from 20 nm particles. The results of gas sensitivity tests on all the samples showed that the response to 50 ppm n-butanol at 250 °C reached 540 when Co was doped up to 5 at%. In comparison, the sensor showed very low response to benzene gas with good selectivity. The high response of the sensor to n-butanol is due to the increase in vacancy oxygen content and redox reactions due to the multivalent nature of Co ions. The article concludes with a detailed analysis of the sensing mechanism.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Lang Wang,Yonghang Zhang,Linxiang Zhou,Guangtao Luo,Zhiwei Meng,Haodong Jin,Enze Zhu,Mingli Xu
The cathode's oxygen reduction reaction (ORR) plays a crucial role in a variety of fuel cells. Developing affordable and efficient non-precious electrocatalysts for the ORR poses a major hurdle in the realm of electrochemical energy technologies. This work presents a transition metal-based catalyst, Fe-ONC, in which Fe is loaded in an oxygen-enriched nitrogen-doped carbon (NC) material. Oxygen enrichment of the catalyst was achieved by a pre-oxidation strategy. The XPS analysis reveals that Fe-ONC exhibits a higher abundance of oxidized species. The Fe of Fe-ONC exists in the form of Fe 3 O 4 particles and Fe-N x , respectively, which are uniformly distributed in the NC. The even spread of iron sites and the plentiful presence of oxygen-rich species are key factors in the superior ORR efficiency of Fe-ONC. Fe-ONC's half-wave potential (E 1/2 ) in an alkaline environment (0.1 M KOH) stands at 0.891 V, markedly surpassing the standard commercial Pt/C value (0.840 V). Additionally, Fe-ONC demonstrated enhanced longevity and resistance to ethanol in comparison to commercially available Pt/C. Fe-ONC's outstanding efficacy highlights its potential as an alternative to precious metal catalysts. The document outlines a plan for creating ORR catalytic materials that are sustainable, economical, and efficient.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Rizhao Ou,Zexin Zeng,Xutao Ning,Bin Zeng,Chaofu Wu
Sandwich-type hybrid consisting of N-doped ZnO/N-doped graphene/ N-doped ZnO (NZ/NG/NZ) is fabricated via solution reaction and subsequent carbonization using oligoaniline and graphene oxide (GO) as precursors mixed with zinc acetate solution. Oligoaniline serves as a spacer material by participating in the π-π interaction with GO nanosheets and prevents their restacking. The oligoaniline coordinates with Zn 2+ ions and along with carbonization, it results in a sandwich-type structure of N-doped ZnO/graphene/ZnO composite. The obtained N-doped ZnO/graphene/ZnO composite showed an excellent photocatalytic performance. Remarkably, the sandwich-type structure provides plenty of active sites in which N-doped ZnO has the narrowed bandgap with a visible light response and the N-doped carbon matrix facilitates effective photoinduced electron-hole separation. The strategy presented here offers an effective method to prepare such sandwich-structured N-doped metal oxide/graphene composites for photocatalysis or energy storage.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Lei Wang,Cunzhi Zhang,Hui He,Hongxiang Zhu,Wei Guo,Shile Zhou,Shuangfei Wang,Joe R. Zhao,Jian Zhang
A novel cellulose-based colorimetric sensor (DAC-Tu) with N, S sites for Ag + was prepared. The DAC-Tu exhibited excellent selectivity and sensitivity for Ag + with a naked eyes color change from white to black in mixed metal ions aqueous solutions. The naked-eye in-situ detection limit of DAC-Tu for Ag + was 10 −6 mol/L within 10 min. The cellulose matrix and the grafted functional groups ( C S, NH 2 ) of DAC-Tu all contributed to the low naked-eye in-situ detection limit. The mechanism of the visual recognition of DAC-Tu sensor for Ag + was proposed, the N and S atoms of DAC-Tu preferentially coordination chelated with Ag + to form N Ag, S Ag, and Ag 2 S, and enriched on the cellulose matrix, thus the DAC-Tu presented different color change in response to different concentrations of Ag + . The as-prepared DAC-Tu colorimetric sensor showed a great application prospect for in-situ naked eyes detection of Ag + .
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