JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 12
·8191-8205
·
IF 3.5
Haozhang Liang,Xiangtao Lin,Nanshan Ma,Longqing He,Juxia Tong,Zhiwei Luo,Lingying Ye,Anxian Lu
The Er 3+ /Yb 3+ co-doped tellurite glasses and glass-ceramics (GCs) containing the Gd 2 Te 6 O 15 phase were successfully fabricated via the conventional melting-quenching technique followed by a crystallization regime. The Er 3+ /Yb 3+ co-doped tellurite glasses generated intense up-conversion green (524 and 546 nm) and red (658 nm) emissions when stimulated by a 980 nm laser. The up-conversion green emission intensity increased by 68 and 46 times with the increase of the Yb 3+ /Er 3+ ratio, and the optimal Yb 3+ /Er 3+ ratio was found to be 8:1. The surface crystallization process of the Gd 2 Te 6 O 15 GCs was confirmed through analysis of crystallization kinetics and microscopic morphology. The up-conversion luminescence and lifetime of Er 3+ ions were enhanced by the precipitation of low-phonon-energy Gd 2 Te 6 O 15 crystals. The GC sample crystallized at 480°C for 4 h showed the highest luminescence intensity. The optical thermometry properties of Er 3+ ions at thermally coupled energy levels ( 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ) were explored. The Gd 2 Te 6 O 15 GCs co-doped with 0.25 mol% Er 2 O 3 and 2.0 mol% Yb 2 O 3 exhibited an excellent temperature relative sensitivity ( S r ) of 1.22% K −1 at 293 K and a great repeatability of 98.07%. These results suggest that the Er 3+ /Yb 3+ co-doped Gd 2 Te 6 O 15 GCs show promise for optical thermometry.
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Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Zifei Yan,Grace Dai Zhen Lee,Jian Deng,Guangsheng Luo
The synthesis of terminal epoxides, which are vital components in pharmaceuticals and resins, often involves dehydrochlorination of β-chlorohydrins. Although intrinsic kinetics indicate that the dehydrochlorination reaction in the presence of sodium hydroxide could be very rapid, the practical implementation could always be hindered by long reaction time and low conversion rate. Extended contact between the product and the alkaline solution can lead to hydrolysis of the epoxy group, thus necessitating the process intensification to realize higher production efficiency and selectivity. Here, by characterizing thermodynamic equilibrium data and in-situ recording of the reaction that proceeded in a constant interphase reactor, the heterogeneous dehydrochlorination is demonstrated to occur primarily in the organic phase, and the overall reaction rate depends on the equilibrium concentration of sodium alkoxides. This finding, which is fundamentally different from the traditional view that chlorohydrin is first dissolved in the aqueous phase and then reacts with NaOH, leads us to use inert alcohols to assist in the extraction of NaOH. Based on this method, the reaction time can be reduced over 80 % both in batch and continuous reactors. Besides, the method is demonstrated to be effective in the dehydrochlorination of five different long-chain β-chlorohydrins.
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TRIBOLOGY INTERNATIONAL
·
2022
·
IF 5.62
Shangtao Huang,Binbin Wang,Xueyang Zhao,Shuangjian Li,Xiangchao Liang,Rong Zeng,Wei Li,Xiaojian Wang
With a similar structure as natural cartilage, hydrogels show great potential in repairing cartilage defect. However, achieving high strength and excellent lubrication is still a significant challenge for hydrogels. Herein, we synthesized a series of P(AAm-co-AAc)/Fe 3+ /hydrogenated soy phosphatidylcholine (HSPC) composite hydrogels with high strength and low friction coefficient. By tuning the concentration of Fe 3+ and HSPC, the compressive strength of the composite hydrogels can reach 59.09 MPa, which is higher than that of most current existing hydrogels. Owing to the boundary lubrication and strengthening effect of HSPC, the friction coefficient of the composite hydrogel can be reduced from 0.48 to 0.06. The combination of high compressive strength and low friction under high load makes the hydrogels promising candidates for cartilage defect treatment.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Penghua Qin,Zhen Wu,Pengyu Li,Dian Niu,Minghua Liu,Meizhen Yin
The construction of chiroptical materials with controllable chirality is of special importance in biology and chemistry. Although tunable chirality can be realized in various systems, it remains a fundamental challenge to realize multimodulated chiral inversion. Herein, we report that chiral alanine derivative and fluorescent cyanostilbene derivative co-assemble to prepare supramolecular chiral systems, where twist nanofibers with totally inverted supramolecular chirality and circularly polarized luminescence are obtained through stoichiometric modulation. The supramolecular handedness can be inverted by means of altering the cooling rate and incorporating metal ions. The mechanism study reveals that the synergistic effect among hydrogen bonds, coordination interactions, and π–π stacking interactions contributes to the chirality inversion. This work establishes an effective strategy to precisely modulate supramolecular chirality in multiple ways, which shows great potential in developing smart chiroptical materials capable of achieving complex functionalities.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 14
·19686-19696
·
IF 4.672
Feng Wang,Yinrong Lv,Xueli Bai,Shengjian Zhang,Huifang Wang,Baoyi Li,Aifang Liu,Xiaoping Zhang
Summary Polyhydride electrocatalysts integrated directly into metal substrates have attracted attention because they can provide high electrochemical specific surface area and excellent mechanical properties. In this work, through the classical hydrothermal method and subsequent phosphating procedure, we synthesized for the first time an electrocatalyst with a pyramid-shaped MnCO 3 as the main structure, P and Co as co-doping elements, named Co, P-MnCO 3 , and used it as hydrogen evolution reaction (HER). The experimental results show that the excellent catalytic activity in alkaline media, with current densities of 10 and 200 mA∙cm −2 at 61 mV and 158 mV and low overpotentials, which are better than P-Co (108/234 mV) and P-MnCO 3 (175 mV/340 mV), etc. it has more electrochemically active sites, faster charge transfer rate and lower resistance. The excellent electrochemical properties benefit from the unique highly active binary Co, P-MnCO 3 pyramid brick sites shortened the ion transfer distance and optimized synergistic effect between the doped metal elements (Co,P between MnCO 3 ), the porous connection between Co, P-MnCO 3 and the high conductivity substrate, increased the electron-transfer efficiency between the substrate and material, accelerating the conversion of H + to H 2 ; facilitated the release of bubbles and provided excellent mechanical properties for improved catalyst stability. This work provides a new idea for the synthesis of multi-element electrocatalysts.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-9
·
IF 5.479
Walekar Laxman S.,Zheng Mingda,Zheng Longhui,Long Mingce
Highly fluorescent carbon quantum dots co-doped with selenium and nitrogen (SeN-CQDs) were fabricated via a one-pot hydrothermal route using selenomethionine as the sole precursor. The SeN-CQDs aggregates have sizes between 30 and 45 nm and display blue fluorescence with a quantum yield of 8% at excitation/emission wavelengths of 350/445 nm. The fluorescence is pH dependent and decreases under acidic conditions. The doping of the CQDs with selenium and nitrogen was proven by X-ray photoelectron spectroscopy (XPS). Fluorescence is selectively quenched by perfluorooctanoic acid (PFOA), and this is accompanied by a decreased fluorescence lifetime. Quenching is not due to aggregation in view of the unaltered sizes of nanoparticles as revealed by TEM and DLS analyses. UV-vis absorption titration suggested the formation of an excited state complex between SeN-CQDs and PFOA, and quenching originates from the internal electron transfer in the excited state complex. The method was used to detect PFOA quantitatively in the linear range of 10–70 μM with a 1.8 μM detection limit. The nanoprobe has a high selectivity for PFOA over potentially interfering molecules. The practicability of the method was ascertained by accurate detection of PFOA in real samples by the standard addition method. The method may be further improved by tuning the interaction between PFOA and SeN-CQDs through optimizing the doping and the surface composition of the SeN-CQDs.
Schematic presentation of a fluorometric method for perfluorooctanoic acid detection by using a selenium and nitrogen co-doped carbon quantum dots as the fluorescent probe.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Minling Xie,Liqun Zhu,Weiping Li,Huicong Liu,Tianli Zhang
Sm-Co alloys as permanent magnetic materials have attracted considerable interest for their application in the miniaturization of electronic devices. However, a facile method for depositing Sm- Co alloy films is still urgently needed. In this work, we exploited a simple aqueous electrodeposition approach to prepare Sm-Co films. Electrodeposition was realized by galvanostatic electrolysis from a stable sulfamate aqueous solution. The influence of the applied current density on the composition, morphology, structure and magnetic properties of the Sm-Co films was studied. Samarium was successfully incorporated into the films by the induced effect of Co(II) ions. Manipulating the current density varied the samarium content from 5.8 to 25.3 at%. Sm-Co nanosheets were discovered and were determined to have a mixed nanocrystalline/amorphous character. Furthermore, the electrodeposited Sm-Co films exhibited an obviously enhanced coercivity compared with that of other reported films.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 647
·期 9
·1025-1030
·
IF 1.24
Yihan Wang,Hu Zhou,Jinghao Xiao,Aihua Yuan
Metal selenides as anode materials of lithium-ion batteries (LIBs) has received considerable attention recently. In order to boost the electronic conductivity and alleviate the volume change of electrode materials upon the cycles, a facile strategy is employed in this work, where Prussian blue analogue (PBA) nanocubes are encapsulated into three-dimensional (3D) network of graphene aerogel (GA), followed by a high-temperature selenization treatment to isolate the composite of FeCoSe 2 @GA. The composite can be directly employed as free-standing anode materials of LIBs. Studies reveal that the FeCoSe 2 @GA electrode demonstrates an intriguing cycle stability and rate capability with a specific capacity of ∼500 mAh g −1 at 100 mA g −1 after 100 cycles. The outstanding lithium-storage properties can be attributed to the 3D porous feature as well as the strong confinement effect of GA for FeCoSe 2 particles, which provides a large number of ion-exchange channels, and prevents the severe agglomeration and large volume expansion of active particles during the charge/discharge process.
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Green Energy & Environment
·
2019
·
IF 0
Zhiwei Lu,Xiaochao Xu,Yujuan Chen,Xiaohui Wang,Li Sun,Kelei Zhuo
Supercapacitors with unique performance have been widely utilized in many fields. Herein, we report a nitrogen and sulfur co-doped graphene aerogel (N/S-GA-2) prepared using a low toxic precursor for high-performance supercapacitors. The as-obtained material possesses a hierarchically porous structure and a large number of electrochemical active sites. At a current density of 1 A g −1 , the specific capacitance of the N/S-GA-2 for supercapacitors with the ionic liquid as the electrolyte is 169.4 F g −1 , and the corresponding energy density is 84.5 Wh kg −1 . At a power density of 8.9 kW kg −1 , the energy density can reach up to 75.7 Wh kg −1 , showing that the N/S-GA-2 has an excellent electrochemical performance. Consequently, the N/S-GA-2 can be used as a promising candidate of electrode materials for supercapacitors with high power density and high energy density.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenkai Zhang,Yi Jin,Jiayu Wang,Muge Gu,Yue Wang,Xiangqi Zhang,Yihui Zhang,Wei Yu,Yao Liu,Wei-En Yuan,Jing Su
Targeted elimination of damaged or overexpressed proteins within the tumor serves a pivotal role in regulating cellular function and restraining tumor cell growth. Researchers have been striving to identify safer and more effective methods for protein removal. Here, we propose the synergistic employment of a small molecule degrading agent (PROTAC) and siRNA to attain enhanced protein clearance efficiency and tumor therapeutic effects. Co-delivery liposomes were prepared to facilitate the efficient encapsulation of PROTAC and siRNA. Specifically, the cationic liposome significantly improved the solubility of the insoluble PROTAC (DT2216). The cationic polymer (F-PEI) achieved efficient encapsulation of the nucleic acid drug, thereby promoting endocytosis and enhancing the therapeutic impact of the drug. Both in vivo and in vitro experiments demonstrated remarkable degradation of target proteins and inhibition of tumor cells by the co-delivery system. In conclusion, the co-delivery liposomes furnished a nano-delivery system proficient in effectively encapsulating both hydrophilic and hydrophobic drugs, thereby presenting a novel strategy for targeted combination therapy in treating tumors.
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Materials Research Express
·
2020
·Vol. 7
·期 3
·036201
·
IF 1.929
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
A series of Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films were prepared by a facile solution method, and they were annealed at 550 °C for 2 h. The luminescent properties of the thin films were studied, which involve the energy transfer from Tb3+ to Eu3+. The emission color can be changed from green to red, with increasing Eu3+ doping concentration in Tb3+-doped CaMoO4/SrMoO4 thin films. In addition, it was observed that the PL intensity of Eu3+ will enhance when Tb3+ ions are incorporated into Eu3+-doped CaMoO4/SrMoO4 thin films. The optical band gaps of the luminescent thin films are found to be in the range of 4.49 to 4.72 eV. These results revealed that Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films have a significantly potential application in electroluminescent devices.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 12
·A2654
·
IF 3.12
Lei Zhang,Dandan Zhu,Hongyu Wang
Solvent dramatically affects the behavior of anion intercalation into graphite electrode in dual-ion batteries (DIBs). Our previous studies have confirmed that the intercalation of ethylene carbonate (EC) solvated PF6− is considerably suppressed. However, in this letter, we show that EC can apparently co-intercalate with PF6− into graphite electrode once ethyl methyl carbonate (EMC) is involved inside. In situ X-ray diffraction (in situ XRD), ex situ XRD, fourier transform infrared (FTIR) spectroscopy and electrochemical impedance spectroscopy (EIS) have been carried out to clarify the underlying reason.
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危险品化学品经营许可证（带存储）