Chinese Physics C
·
2023
·Vol. 47
·期 3
·034001
·
IF 3.6
Long He,Junhua Luo,Li Jiang
Measurement of the cross-sections of the 79Br(n, 2n)78Br, 81Br(n, p)81mSe, 81Br(n, α)78As, and 79Br(n, α)76As reactions was performed at specific neutron energies, precisely, 13.5±0.2, 14.1±0.2, 14.4±0.2, and 14.8±0.2 MeV, relative to the standard 93Nb(n, 2n)92mNb and 27Al(n, α)24Na reference reactions using offline γ-ray spectrometry and neutron activation. Monoenergetic neutrons were generated at the China Academy of Engineering Physics via a 3H(d, n)4He reaction using the K-400 Neutron Generator equipped with a solid 3H-Ti based target. The activity of the reaction produce was obtained using a high-purity germanium detector. The cross-sections of the (n, 2n), (n, p), and (n, α) reactions on the bromine isotopes were measured in the 13–15 MeV neutron energy range. The covariance analysis approach was employed for a thorough inspection of any uncertainties within the measured cross-section data. A discussion and comparison of the observed outcome were carried out with previously published data, especially with the results of the JENDL-4.0, JEFF-3.3, TENDL-2019, and ENDF/B-VIII.0 data libraries, along with the theoretical excitation function curve derived by employing the TALYS-1.95 program. Improved cross-section restrictions for the investigated processes in the 13–15 MeV neutron energy range will be obtained using the current findings, which will help to raise the caliber of associated databases. Furthermore, the parameters of relevant nuclear reaction models can be verified using this data.
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JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-11
·
IF 2.426
Du Chunhui,Zhang Xinyi,Ma Xumin
In order to obtain the tunable and charged surface of the membranes, polymerized ionic liquid(PIL) block copolymers poly (methyl methacrylate) (PMMA)-b-poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazoliumbromide) (PMEBIm-Br) with different poly(ionic liquid) brush lengths were synthesized by RAFT polymerization method and used in the fabrication of poly(vinylidene fluoride) blend membranes. Chemistry analysis confirmed the successful copolymerization of P(MMA-b-MEBIm-Br) with different chain lengths of PMEBIm-Br blocks, and the PIL groups was also detected on the surface of the blend membranes, which contributes to the hydrophilic and positively charged surface of the membrane. These properties were further enhanced by the chain length of PMEBIm-Br blocks in the copolymer. The surface wettability of the membranes can be regulated from hydrophilicity to hydrophobicity by anion exchange, and the water flux changes also confirmed these phenomena. In addition, the effects of PMEBIm-Br blocks on the separation properties of the membranes were investigated using two dyes, namely, orange G and rhodamine 6G. Results indicated that the blend membranes with long length of PMEBIm-Br blocks had high rejection and good antifouling property to rhodamine 6G. Furthermore, the adsorption experiment of the blend membranes to the two dyes also indicated that blend membranes with long length of PMEBIm-Br blocks would have good dye adsorption-separation property.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yan Sang,Xi Cao,Guangdong Dai,Lvxuan Wang,Yin Peng,Baoyou Geng
The construction of heterojunction system can promote the separation and transfer of photogenerated electron-hole pairs, which is conducive to the degradation of sewage. In this paper, heterostructured Bi 2 O 3 /Bi 2 S 3 nanoflowers are fabricated by a one-step hydrothermal method. The microstructure and optical absorption properties are studied through the detailed characterization of this heterojunction. The visible light photocatalytic ability of as-prepared Bi 2 O 3 /Bi 2 S 3 heterojunctions are investigated by photocatalytic removals of RhB and Cr(VI). The results of photocatalysis indicate that removal efficiencies of RhB and Cr(VI) over Bi 2 O 3 /Bi 2 S 3 heterojunction are higher than those of pure Bi 2 O 3 and Bi 2 S 3 . The improved photocatalytic performance of the Bi 2 O 3 /Bi 2 S 3 heterojunctions could be attributed to a combination of the p-n junction between the p-type Bi 2 S 3 and n-type Bi 2 O 3 , and large specific surface areas (46.31 m 2 g −1 ). Moreover, the probable photocatalytic mechanism of composite photocatalysts is explored in detail by active species trapping experiments, N 2 adsorption–desorption, the transient photovoltage electrochemical impedance spectroscopy and photoluminescence measurements. This work provides new insights into building of the efficient and novel heterogeneous photocatalysts and other energy-related devices.
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Small
·
2018
·Vol. 14
·期 12
·1703453
·
IF 9.598
Caiyan Gao,Guangming Chen
Although composites of organic polymers or n-type small molecule/carbon nanotube (CNT) have achieved significant advances in thermoelectric (TE) applications, p-type TE composites of small organic molecules as thick surface coating layers on the surfaces of inorganic nanoparticles still remain a great challenge. Taking advantage of in situ oxidation reaction of thieno[3,4-b]pyrazine (TP) into TP di- N -oxide (TPNO) on single-walled CNT (SWCNT) surface, a novel synthesis strategy is proposed to achieve flexible films of TE composites with narrow-bandgap (1.19 eV) small molecule coating on SWCNT surface. The TE performance can be effectively enhanced and conveniently tuned by poly(sodium- p -styrenesulfonate) content, TPNO/SWCNT mass ratio, and posttreatment by various polar solvents. The maximum of the composite power factor at room temperature is 29.4 ± 1.0 µW m −1 K −2 . The work presents a way to achieve flexible films of p-type small organic molecule/inorganic composites with clear surface coating morphology for TE application.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 14
·4476-4490
·
IF 4.174
Keyu Tao,Lian Wang,Yang Hai,Yun Gong
P–TiOn–VOm nanowires were grown on nickel foam (NF) via a one-pot hydrothermal method and by further vapor deposition/phosphorization method. It was found that low valence states of titanium oxide and deficient-oxygen coexist in P–TiOn–VOm/NF. Furthermore, (TiO1.25)3.07 (denoted as TiOn) and VO (denoted as VOm) possess similar structures and matched facets, and their epitaxial growth leads to the formation of TiOn/VOm heterostructure with a formation energy of −1.59 eV. P–TiOn–VOm/NF possesses good electron conductivity and electrons can be transferred from Ti to V centers, as evidenced by the DFT calculations and the XPS spectra. As a result, the specific capacity of P–TiOn–VOm/NF can reach 785 C g−1 at 1 A g−1 in the potential range of 0–0.55 V vs. Hg/HgO, which is much larger than those of VOm/NF, P–VOm/NF, and P–TiO2–VOm/NF. On the other hand, the TiOn/VOm heterostructure also favors the separation and transfer of photoinduced electrons and holes, and P–TiOn–VOm/NF exhibits visible-light-driven photoresponse. Under visible light illumination, the specific capacity of P–TiOn–VOm/NF is increased by 6.2% relative to that in the dark. Furthermore, the P–TiOn–VOm/NF//activated carbon (AC) asymmetric supercapacitor (ASC) shows an energy density of 37.2 W h kg−1 at a power density of 1 kW kg−1 and excellent cycling performance with 93.6% capacity retention after 10 000 cycles at 5 A g−1, which is comparable to and even superior to those of titanium oxides and vanadium oxides. A promising achievement has been proposed to improve the energy storage performance of P–TiOn–VOm through P-functionalization and O-deficiency in this work.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 28
·14254-14264
·
IF 11.301
Qipeng Cai,Jie Mao,Yuntong Li,Jun Liu,Hong Zhang,Junwen Huang,Tong Wu,Yuxin Yang,Conghui Yuan,Lizong Dai
In this work, utilizing a dynamic imine exchange, we develop a selective etching strategy to construct porous polymer nanosphere precursors, which can be subsequently carbonized into hierarchical porous carbon nanospheres (PCNPs) co-doped with both N and P elements. Our strategy to construct polymer precursors is simple, suitable to various aldehyde and amino building blocks and easy to incorporate heteroatoms into the carbon matrix. Importantly, by simply adjusting the concentration of the etching agent, PCNPs with micro- and meso-pores or even hollow structures can be controllably fabricated. The as-prepared PCNPs exhibit excellent electrochemical performance with the highest specific capacitances of 359.5 F g−1 at 0.5 A g−1 and 224.0 F g−1 at 20 A g−1 under acidic conditions (1 M H2SO4). The cycling stability of the PCNPs is also attractive, with a capacitance retention of ∼95% after 5000 cycles. Semi-solid-state supercapacitors assembled using PCNPs as electrodes and H2SO4/PVA as a gel electrolyte exhibit specific capacitances up to 226.7 F g−1 at 0.2 A g−1 and 126.0 F g−1 at 20 A g−1.
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Frontiers in Microbiology
·
2025
·
IF 4.5
Yuanyang Yi,Yuxian Wang,Wanqin Liu,Jing Zhu,Meiying Gu,Qiong Jia,Xue Li,Munire Mutalifu,Ling Jiang,Wei Zhang,Zhidong Zhang
Introduction: Di-n-butyl phthalate (DBP) is one of the most widely used phthalate esters (PAEs) and is considered an emerging global pollutant. It may pose a significant threat to ecosystem and human health due to its residual hazards and accumulation in the environment. Bacteria-driven PAE biodegradation is considered an economical and effective strategy for remediating such polluted environments.Methods: A DBP-degrading bacterium (P-7), was isolated from long-term film mulched cotton field soil. Its identity was confirmed via physiological, biochemical, and 16S rRNA gene analyses. The degradation conditions were optimized through single-factor experiments and response surface methodology (RSM).Furthermore, the whole-genome sequencing coupled with metabolomics was employed to elucidate metabolic mechanisms.Results: Priestia megaterium P-7 (P. megaterium P-7) achieved 100% DBP removal within 20 h under optimal conditions and exhibited broad substrate specificity for other PAEs. Genomic analysis identified key genes (lip, aes, ybfF, estA, and yvaK) encoding esterases/hydrolases that initiate DBP catabolism, converting it to phthalic acid (PA). Subsequent decarboxylation (pdc, bsdCD, mdcACDH, and lysA) and dioxygenase-mediated steps integrated PA into the TCA cycle. Metabolomics revealed three degradation pathways: decarboxylation (DBP → MBP → BB → BA→Catechol), hydrolysis (DBP → MBP → PA → PCA → Catechol) and direct β-oxidation (DBP → DEP → MEP → PA → Catechol).Conclusion: P. megaterium P-7 demonstrates exceptional degradation efficiency, substrate versatility, and environmental stress tolerance, making it a promising candidate for bioremediation of organic pollutants in contaminated soil.
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Nanoscale
·
2019
·Vol. 11
·期 18
·8967-8977
·
IF 6.97
Li Li,Rui Zhao,Tinghua Xu,Dandan Wang,Du Pan,Kun Zhang,Caiyan Yu,Xia Lu,Guanjie He,Ying Bai
LiNi0.5Mn1.5O4 (LNMO) spinel has drawn increasing attention due to its high voltage, stabilized electrochemical performance and safety features as a cathode for lithium-ion batteries. However, the main challenge lies in its unstable surface structure, especially at elevated temperatures. In this paper, we decorate the LNMO precursor with a solid electrolyte of Li1.4Al0.4Ti1.6(PO4)3 (LATP) via a facile sol–gel method, followed by a co-crystallization process at 820 °C, to successfully generate a LATP modification shell at the surface of LNMO. The LATP modification shell could not only optimize the morphology of LNMO including the limitation of particle growth and control of crystalline orientation, but also realize ion doping during the co-crystallization process. By tuning the LATP contents, the 2 wt% LATP modification is found to be the most effective at balancing the interfacial stability and Li+ diffusion kinetics of LNMO, as well as enhancing its rate capability and capacity retention at high temperatures. As a result, the 2 wt% LATP-modified LNMO cathode exhibits a high reversible capacity of 84.8 mA h g−1 after 500 cycles with a capacity retention of 68.9%, and a superior rate capability (102.0 mA h g−1 at 20 C) at room temperature. Moreover, this electrode also delivers a good capacity retention of 85.7% after 100 cycles at 55 °C, which is ascribed to the stabilized interface with a LATP protective layer.
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RSC Advances
·
2017
·Vol. 7
·期 35
·21758-21767
·
IF 3.108
Yali Bai,Zhenhuan Li,Bowen Cheng,Maliang Zhang,Kunmei Su
U–TiO2 is successfully coated with SiO2 and subsequently well modified by APTES, and the core–shell structure exists on TiO2@SiO2 and TiO2@SiO2/APTES, which greatly reduces aggregation of the TiO2 nanoparticles. The photocatalytic activities of U–TiO2, TiO2@SiO2, and TiO2@SiO2/APTES are evaluated using MB decomposition. Nearly 50% of the MB is degraded after 15 min in the presence of the U–TiO2 under UV radiation (300 W), and only 17.44% and 4.18% of the MB is degraded in the presence of the TiO2@SiO2-0.6 and TiO2@SiO2/APTES-1. However, TiO2@SiO2/APTES-0.6 and TiO2@SiO2-0.2 exhibit excellent UV absorbance capacities, and the TiO2@SiO2/APTES-0.6 achieves 80% of the UV-shielding ability of U–TiO2. Poly(p-phenylene sulfide) (PPS) is an easily photodegraded material and TiO2/PPS is more seriously photodegraded than PPS, however, the TiO2@SiO2/APTES nanoparticles can effectively protect the PPS from UV degradation, owing to their lower photocatalytic activities, higher UV-shielding abilities and easy dispersion in the PPS matrix. The breaking strength retention rate of the 1 wt% TiO2@SiO2/APTES/PPS film shows a maximum increase of 38.26%, and the breaking elongation retention rate increased by 41.64% at 2 wt% TiO2@SiO2/APTES loading. These results reveal that the incorporation of the TiO2@SiO2/APTES nanoparticles into the PPS matrix imparts excellent anti-UV properties to the PPS matrix, leading to a mechanical performance improvement.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2013
·
IF 2.487
Ting Yang,Feifei Xu,Jinhui Xu,Danjun Fang,Ying Yu,Yun Chen
P-glycoprotein (P-gp) is the most frequently proposed factor for multi-drug resistance. It is traditionally measured using antibody-based methods. While these techniques can provide relative quantification values for P-gp levels, the important information that is usually missing is its amount in the biological system. In this study, a novel and advanced liquid chromatography–tandem mass spectrometry (LC/MS/MS)-based targeted proteomics assay was developed and validated for the determination of P-gp in the breast cancer drug sensitive cell line MCF-7/WT and the drug resistant cell line MCF-7/ADR. Three tryptic peptides (434STTVQLMQR442, 674GSQAQDR680 and 368IIDNKPSIDSYSK380) can specifically represent P-gp. Among these peptides, 434STTVQLMQR442 was selected as the surrogate analyte for quantification, and a stable isotope-labeled synthetic peptide with the same sequence was used as an internal standard. The calibration range was validated from 10 to 1000 ng/mL. The intra- and inter-day precisions were within 5.9% and 3.7%, respectively. The accuracy for the quality control (QC) samples was within 8.0%. Using this assay, the amounts of P-gp were accurately quantified as 3.53 fg/cell (∼2.08 × 10 −2 amol/cell) in the MCF-7/WT cells and 34.5 fg/cell (∼2.02 × 10 −1 amol/cell) in the MCF-7/ADR cells. This outcome was then compared with those obtained by conventional analytical methods including confocal microscopy, western blotting and flow cytometry. The comparative results show that not only is the LC/MS/MS-based targeted proteomics assay able to monitor the protein levels in a more accurate manner, but the large discrepancy observed between the other methods was most likely due to the lack of specificity and the semi-quantitative nature of the conventional assays
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 36
·12213-12223
·
IF 7.393
Xuefeng Xia,Dan Zhang,Xiaofeng Wang,Zonghu Xiao,Fan Li
In recent years, the nickel oxide (NiOx)-based planar p–i–n perovskite solar cell (PSC) has progressed rapidly. Nevertheless, poor electrical properties of NiOx, unoptimized band alignment between NiOx and perovskites, as well as pervasive defects and unwanted chemical redox reactions at NiOx/perovskite interfaces have severely limited the device efficiency and stability. It is of particular interest to explore a facile approach to address these issues simultaneously. Herein, an effective carbon-quantum-dot-hybridized NiOx (CQD-hybridized NiOx) hole transport layer (HTL) is fabricated via hybridizing a kind of environmentally friendly CQD with NiOx. By virtue of the rich surface polar groups of CQDs, hybridization of such CQDs with NiOx can efficaciously upgrade the electrical properties of NiOx HTLs, thereby reducing ohmic loss and energy level offset at NiOx/perovskite interfaces. Meanwhile, the application of CQD-hybridized NiOx HTLs can boost the nucleation and growth of perovskite layers, thus suppressing the formation of interfacial defects/traps and reducing interface-mediated nonradiative recombination losses. Moreover, such CQD-hybridized NiOx HTL can also diminish redox reactions at the NiOx/perovskite interface, improving interface stability. Based on this CQD-hybridized NiOx HTL, a champion PCE of 20.53% with enhanced stability has been achieved. More strikingly, the optimized device delivers a Voc as high as 1.16 V, the highest Voc for CH3NH3PbI3 PSCs based on NiOx HTLs as far as we know. These results demonstrate that CQD-hybridized NiOx HTLs will be a promising candidate for efficient and stable planar p–i–n PSCs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xu Yang,Yuandong Zhang,Changpeng Wang,Bingyao Wang,Xiaoxu Liang,Hui Li,Hongyao Ding,Si Yu Zheng
Conductive hydrogels are ideal candidates for flexible electronics owing to their excellent biocompatibility and flexibility. However, achieving excellent mechanical strength and conductivity simultaneously remains a significant challenge. Herein, we report a mechanically robust and ionically conductive hydrogel that can be readily fabricated via a two-step strategy involving polymerization of a hybrid network composed of poly(acrylamide- co ‑sodium acrylate), gelatin and carboxymethyl chitosan followed by immersion in a mixed solution of phytic acid and magnesium sulfate. Phytic acid reinforced hydrogen bonding interactions and acted as dynamic crosslinkers. Sulfate ions promoted the hydrophobic aggregation and triple helices formation via the Hofmeister effect, and magnesium ions coordinated with carboxy groups among the polymer network. These newly formed interactions synergistically strengthened the hydrogel network. The resulting hydrogel exhibited exceptional tensile strength, high stretchability, and remarkable toughness, yet low modulus. Additionally, the incorporation of free ions endowed the hydrogels with high conductivity, making them suitable for flexible strain sensors. These hydrogel-based sensors demonstrated excellent linear responsiveness over a wide strain range with satisfactory sensitivity, thus enabling accurate monitoring of diverse human motions from large joint bending to subtle vocal vibrations. This work presents an effective strategy to design conductive and tough hydrogels for flexible electronics.
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