POLYMER BULLETIN
·
2019
·Vol. 77
·期 8
·4401-4416
·
IF 1.858
Zhao Junchai,Li Shichao,Zhao Yujing,Peng Zheng
In this work, composite hydrogels composed of sodium alginate (SA) and two crystal structures of cellulose nanocrystals (CNCs) I and II were prepared, respectively. Impacts of CNC polymorphs and initial state of the hydrogels on the swelling kinetics were analyzed on the basis of power law and Schott’s second-order kinetic equation. It was found that the swelling ratio of SA/1 CNC II was the largest, and it showed the non-Fickian diffusion behavior, while SA and SA/1 CNC I exhibited the Fickian diffusion behavior. And the swelling ratio of soaked hydrogels was great larger than that of the rinsed ones, but the swelling mechanism of the two situations was almost the same, that is, the Fickian diffusion behavior. In addition, drug release tests were performed in deionized water using chloramphenicol as a model drug. The results indicated that for the soaked hydrogels, the drug loading was high, while the release rate was slow. The reason for the higher loading but slower release rate was also discussed based on the morphology of hydrogels. On the other hand, the addition of CNC II into SA brought the high drug loading and slow release rate. It resulted from the strong hydrophilicity of CNC II and the strong interaction between drug and SA/CNC II hydrogels. This work could give a new promise for tuning the swelling and drug release behavior of hydrogels by varying the initial state of hydrogels or the crystal form of CNCs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 16
·12320-12325
·
IF 2.019
Li Gang
Bi 2 WO 6 nanofibers were synthesized by an electrospinning process. The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The XRD patterns and FTIR spectrum suggest that Bi 2 WO 6 nanofibers have the orthorhombic phase. The SEM and TEM images show that Bi 2 WO 6 nanofibers have a rough surface and a large number of hollow caves. The Bi 2 WO 6 hierarchical nanofibers show a high decomposition efficiency of MO under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 nanofibers results from the large specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 11
·2146-2152
·
IF 1.113
Xu Jinku,Zhang Yongchun
Aligned fibers in micro-/nano-scale have attracted more attention especially in tissue engineering field because cells can orientation growth along the fiber. However, it is still a huge technological challenge in achieving it as a result of the inherent bending instability of an electrospinning jet. Herein, we report a novel and simple spinning approach, in which low dielectric constant of dioxane was judiciously used as solvent for spinning dope, to obtain electrospinning jet with low induced charge, therefore eliminating electrically and aerodynamically driven bending instability, and forming a stable and low forward-moving velocity jet longer than 100 cm. This consequently allows for readily collecting and fabricating individual fibers, well-aligned ultrafine fiber arrays over large areas. Our approach has proved to be effective in preparing well-aligned ultrafine fibers from biodegradable poly(D, L-lactic acid) with different molecular mass, natural polymer acetyl cellulose and synthesized non-biodegradable polymer polystyrene.
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MEDICINAL CHEMISTRY RESEARCH
·
2021
·Vol. 30
·期 10
·1856-1867
·
IF 1.965
Yin Yu-dong,Liu Jing-jing,Liao Wen-fei,Guo Xian-kun,Zhang Li-shan,Mo Wei-bin,Cheng Ke-guang
As 17 β -estradiol and its derivatives have good affinity with estrogen receptors and have unique antitumor properties, O 1 -propargyl- N 4 , N 4 -bis(2-chloroethyl)-4-aminophenol and N 4 , N 4 -dipropargyl- N 1 , N 1 -bis(2-chloroethyl)-1,4-phenylenediamine were respectively combined with 17 β -estradiol through linkers of different lengths. These targeted novel nitrogen mustard 17 β -estradiol derivatives were tested antiproliferative activity using the MTT assay. The results illustrated that these compounds were less toxicity to HL-7702 (human liver cells) and SKOV-3, though all their activity potency was moderate or weak aganist the MDA-MB-231, MCF-7 and BEL-7404 cell lines. The inhibitory activity of the O 1 -propargyl- N 4 , N 4 -bis (2-chloroethyl)-4-aminophenol derivatives (compounds III-1~6 and VII-1~4 ) were obviously better than the N 4 -dipropargyl- N 1 , N 1 -bis (2-chloroethyl) -1,4-phenylenediamine derivatives (compounds IV-1~6 and VIII-1~4 ) against tested tumor cell lines. And three hybrids (compounds III-2 , III-6 , and VII-3 ) exhibited good inhibitory activity against BEL-7404 cell line (IC 50 = 13.5, 15.3 and 13.9 μM, respectively). After that, we performed KEGG pathway analysis on compound III-6 , and the results showed that III-6 mainly induced breast cancer cell apoptosis by regulating the expression of the proteins in NF-κ B pathway.
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ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Liu Zhili,Yan Yumei,Li Jing,Zhou Wenfeng,Gao Haixiang,Lu Runhua
Heavy metal pollution has always been a great threat to human health and safety. Compared with other heavy metals, although zirconium ion (Zr(IV)) is equally harmful, due to the lack of research on Zr(IV) in the biological systems and environment, its detection does not seem to have received the attention it deserves. Herein, a rapid visual dual-mode detection (colorimetric and chrominance method) of Zr(IV) based on l -histidine functionalized gold nanoparticles (HIS-AuNPs) has been reported. AuNPs and HIS-AuNPs before and after adding Zr(IV) were characterized by UV–Vis, TEM, DLS, Zeta potential, EDS and FT-IR, etc. These results showed that l -histidine was successfully modified on the surface of AuNPs by forming a stable Au–N bond, and its modification had little effect on the dispersion degree of AuNPs. After the addition of Zr(IV), interaction of this metal ion with the imidazolyl group on l -histidine can obviously cause the aggregation of HIS-AuNPs within 12 min, and the dispersion state and particle size of HIS-AuNPs can be significantly changed. These two detection modes were established by means of absorbance and color change of solution, and being used in addition and recovery experiments of Zr(IV) in natural water. Under the optimal conditions, these two modes exhibited good linearity within 15–70 and 20–100 μmol L −1 , and limit of detection of 2.62 and 6.25 μmol L −1 . The proposed method was highly sensitive and selective, which provided a new convenient way to realize the detection of Zr(IV). Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zheng Ziming,Li Jingjing,Dong Xiaofei,Zeng Zifeng,Lin Kunhong,Li Jingling
The development of a simple and efficient method for preparing porous tungsten trioxide (WO 3 ) electrochromic films using structure-directing agents is highly urgent for their industrialization. To this end, this work presents an efficient approach using rapid co-pyrolysis of polyethylene glycol 400 (PEG-400) and ammonium metatungstate (AMT) to produce mesoporous WO 3 thin films. The findings indicate that the concentration of PEG influences both the wettability of the precursor solution on the FTO substrate and the state of the PEG micelle solution, ultimately leading to WO 3 films with diverse morphologies after the co-pyrolysis of AMT and PEG. The porous structure significantly enhances hydrogen ion intercalation/deintercalation, and thus improves electrochromic properties. The optimized electrochromic films demonstrate a 54.5% optical modulation range at 633 nm, fast switching times (2.8 s for coloration and 1.5 s for bleaching), and a coloration efficiency of 83.2 cm 2 C⁻ 1 . In pursuit of broader optical modulation capabilities, we further innovated by developing a multilayer porous film strategy, enabling precise control over thickness through repeated spin-coating/heating cycles. Remarkably, a three-layer configuration achieved an extraordinary optical modulation of up to 87.2%, ranking among the best performances reported in the electrochromic field. This novel methodology paves the way for expedited manufacturing of porous amorphous metal oxide films and positions the enhanced WO 3 film as a highly promising candidate for advanced electrochromic technologies. Graphical abstract
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Xia Hongyang,Zheng Boyuan,Zhao Xu,Huang Yanting,Wang Hongqiang,Hu Eming,Lei Zhiwu,Hu Fang,Wang Qingliang
Uranium (U) and beryllium (Be) are strategic critical metals. It is imperative to realize the comprehensive utilization of U or Be poly-metallic resources. This study employed solvent extraction to separate and recover U and Be from a simulated acidic sulphate leachate from a U-Be associated ore. The results indicated that the mixture extractant system containing bis-(2-ethylhexyl) phosphoric acid (D2EHPA) and tributyl phosphate (TBP) had affinity for U, and the selectivity of U towards Be was dependent on the hydrogen ion concentration of the solution. 99.74% U and 6.98% Be were extracted with a two-stage counter-current extraction at sulfuric acid concentration of 1.58 mol/L. By using 2 mol/L Na 2 CO 3 solution as the stripping solution, 94.79% U was stripped from the U-loaded organic phase with a one-stage stripping process. After adjusting the pH of the raffinate to 2, with D2EHPA as extractant, 99.76% Be was recovered by performing a two-stage counter-current extraction. Besides, Be could be well stripped from the Be-loaded organic phase with 3 mol/L NaOH solution. And the stripping rate of Be reached 98.85% with a one-stage stripping process. The established method to separate U and Be from sulphate solutions with high acidity has several advantages, including recyclable, reliable, and environmentally friendliness, providing a promising new pathway for the green recovery of U and Be from poly-metallic resources.
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ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Yuan Chao,Ge Hongwei,Cao Benmei,Wang Suhua
The ability to sensitively and quantitatively detect uranyl in complex samples plays a vital role in environmental monitoring. In this work, an MOF-coated gold (Au) nanohybrid was synthesized for uranyl detection by surface-enhanced Raman scattering (SERS) technology. The MOF shell not only prevents the Au nanoparticles from rapid aggregation, but also effectively enhances the Raman signal of uranyl. A detection limit of as low as 0.5 μM could be achieved in solution, which could be comparable to the previously reported ones from SERS-based approaches. Moreover, the prepared SERS-active substrate was also applied to uranyl detection in real samples. Graphical Abstract
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npj Science of Food
·
2024
·Vol. 8
·期 1
·1-12
·
IF 6.3
Zhang Meng,Du Pengfei,Xiao Yirong,Liu Hao,Wang Meixue,Zhang Yumei,Chen Xin
Sodium dehydroacetate (DHA-Na), a widely used preservative, can induce sex-differentiated coagulation disorders primarily resulting from its metabolism. However, the underlying mechanisms remain poorly understood. Here, we identified several Cytochrome P450 (CYP450) sub-enzymes involved in sex differences related to DHA-Na metabolism, along with two related DHA-Na metabolites. CYP1A2, CYP3A2, and CYP2D1 were primarily responsible for DHA-Na metabolism, which was stronger in male rats than in female rats. Inhibition of these isoforms separately resulted in the DHA-Na metabolic capacity in male rats becoming equal to, or even weaker than, that in female rats. Furthermore, Cyp1a2, Cyp3a2, Cyp2d1 , and Cyp2c11 expression was higher in male rats than in female rats, suggesting these enzymes are related to exhibited sex differences in DHA-Na metabolism. Moreover, 3-glycoloyl-6-methy-2,3-dihydropyran-2,4-dione (C 8 H 8 O 5 ) and 3-imino-6-methyl-2,3-dihydropran-2,4dione (C 6 H 5 O 3 N) were identified as the two main DHA-Na metabolites. These findings provide crucial insights into potential mechanisms underlying sex differences in DHA-Na metabolism and its metabolites in rats.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-9
·
IF 3.9
Yang Chunlei,Xu Guiju,Hou Chenghao,Zhang Hongwei
Heavy metal ions pollution in environmental waters has an increasing impact on human health. As two common metal ions, copper ions (Cu 2+ ) and ferric ions (Fe 3+ ) widely exist in nature and play a vital role in life process. Therefore, it is significant to design sensitive and simple detection approaches for Cu 2+ and Fe 3+ . In our work, the ratiometric fluorescence analysis method (denoted as N-CDs/OPD) was established for Cu 2+ and Fe 3+ detection. The N-CDs exhibited a Cu 2+ and Fe 3+ fluorescence quenching response properties. The o-phenylenediamine (OPD) may be oxidized to 2,3-diaminophenazine (DAP) by Cu 2+ and Fe 3+ . With addition of Cu 2+ or Fe 3+ , the fluorescence of N-CDs (436 nm) was quenched and a new peak at 556 nm (DAP) appeared, which realized fluorescent ratiometric detection of Cu 2+ and Fe 3+ . The Cu 2+ concentration shows a good linear correlation versus fluorescence ratio (F 436 /F 556 ) in the range of 10 to 30 µM (R 2 = 0.9981) with detection limit (LOD) of 0.86 µM. In addition, a good linear relationship between fluorescence ratio (F 436 /F 556 ) and Fe 3+ concentration in the range of 20 to 80 µM (R 2 = 0.9880) with LOD of 7.12 µM. This nanoprobe realizes the detection of authentic samples successfully, which is expected to serve as a testing kit for analysis in water samples.
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RARE METALS
·
2024
·Vol. 44
·期 1
·503-514
·
IF 9.6
Wu Peng,Wang Jun,Li Jian-Yu,Feng Jing,He Wen-Ting,Guo Hong-Bo
In this work, a novel microwave absorbing material (MAM) made of a pseudo-binary of Sr 2 TiMoO 6 –Al 2 O 3 (STM) is proposed first. The MAMs labeled as STM X ( X = 60, 70, 80 and 100, respectively), in which X is the initial weight percent of Sr 2 TiMoO 6 , were synthesized using the solid-state reaction method. Compared with STM100, some equilibrium phases, including SrTiO 3 , Mo, Sr 8 (Al 12 O 24 )(MoO 4 ) 2 and a few undefined ones, are presented in the composites as evidenced by X-ray diffraction results and scanning electron microscopy due to the chemical reaction between Sr 2 TiMoO 6 and Al 2 O 3 component. Besides conductance loss, heterogeneous interfaces between various equilibrium phases introduce interfacial polarization, which causes an enhancement of dissipation for the incident electromagnetic wave. Among the synthesized samples, STM80 presents the best microwave absorbing properties. It has a minimum reflection loss (RL min ) of − 26 dB and an effective absorbing bandwidth up to 2.7 GHz when the thickness is only 1 mm. This indicates that STM80 is a new type of microwave absorbing material with strong absorption and ultrathin thickness.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Liu Wei,Yu Jiage,Li Tianshui,Li Shihang,Ding Boyu,Guo Xinlong,Cao Aiqing,Sha Qihao,Zhou Daojin,Kuang Yun,Sun Xiaoming
Low-energy consumption seawater electrolysis at high current density is an effective way for hydrogen production, however the continuous feeding of seawater may result in the accumulation of Cl − , leading to severe anode poisoning and corrosion, thereby compromising the activity and stability. Herein, CoFeAl layered double hydroxide anodes with excellent oxygen evolution reaction activity are synthesized and delivered stable catalytic performance for 350 hours at 2 A cm −2 in the presence of 6-fold concentrated seawater. Comprehensive analysis reveals that the Al 3+ ions in electrode are etched off by OH − during oxygen evolution reaction process, resulting in M 3+ vacancies that boost oxygen evolution reaction activity. Additionally, the self-originated Al(OH) n − is found to adsorb on the anode surface to improve stability. An electrode assembly based on a micropore membrane and CoFeAl layered double hydroxide electrodes operates continuously for 500 hours at 1 A cm −2 , demonstrating their feasibility in brine electrolysis.
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