POLYMER BULLETIN
·
2024
·Vol. 81
·期 11
·10351-10367
·
IF 3.1
Wang Guoqiang,Wu Yifan
Polylactic acid (PLA), which is widely used in degradable packaging and medicine, has attracted much attention in recent years. However, PLA's ductility and processability still need to be improved. Previous literature indicated that poly(butylene diglycolate-co-butylene terephthalate) (PBDT) had good ductility, and degradability due to the introduction of diglycolic acid's ether group. Based on the above advantages of PBDT, the PLA/PBDT blends were prepared to improve the ductility of PLA. The blends' thermal, crystallinity, mechanical, and rheological properties and compatibility were characterized. The blends all showed greater elongation at break compared to PLA. The WAXD results showed that the tensile specimens of PBDT were semi-crystalline, and the tensile specimens of PLA and the blends were almost amorphous. The incorporation of PBDT caused the fracture behaviour of the blends to change from brittle to ductile behaviour. It is concluded that PBDT can effectively improve the ductility of PLA and the blend with 20 wt.% PBDT has high elongation at break (135%).
研究领域:
材料科学
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高分子科学
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生物降解材料
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大分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 7
·5584-5594
·
IF 3.442
Lv Tingjian,Guan Li,Xiao Peng,Zhang Dongyun,Chang Chengkang
In this work, we report the preparation and the enhanced electrochemical performance of P2-type Na 0.67 Li x (Mn 0.5 Fe 0.25 Co 0.25 ) 1− x O 2 layered cathode materials with different Li substitutions via a nanomilling-assisted solid-state method. The experimental results show that the introduced lithium ions can greatly improve the performance of the material after entering the transition metal layer. Among these synthesized samples, the Na 0.67 Li 0.03 (Mn 0.5 Fe 0.25 Co 0.25 ) 0.97 O 2 electrode exhibits an exceptionally high specific capacity of 190.6 mAh g −1 at 0.1 C rate and a capacity retention of 89.5% after 30 cycles. Obviously, the specific capacity retention is improved by 15.3% compared with the pristine Na 0.67 (Mn 0.5 Fe 0.25 Co 0.25 )O 2 without Li incorporation (the specific capacity retention is only 74.2% after 30 cycles). Simultaneously, the sample also shows a large increase in rate performance compared to the pristine material. All of the enhancement can be explained by the fact that the introduced Li ions suppress the phase transition during the charge–discharge process and avoid the volume expansion of the electrode, which significantly reduce the occurrence of micro-cracks within the electrode. The reduced polarization, the decreased internal resistance of the prepared electrodes and the increased sodium ion diffusion coefficient, as confirmed from the CV and EIS measurements, can be regarded as the three major reasons for the enhanced electrochemical performance of the Li ion-substituted materials.
研究领域:
材料科学
·
电化学
·
储能技术
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固态化学
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纳米技术
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 2
·599-605
·
IF 2.817
Zhang Lei
The high energy density of lithium metal batteries (LMBs) causes great attention of researchers. However, side effects of liquid electrolytes and dendrite growth problem limit the development of LMBs. Solid electrolytes with high ionic conductivity, good film-forming ability, and compatible interface with electrodes are highly desired yet remain to be explored. Herein, we design and fabricate a thiol-branched all-solid-state polymer electrolyte (SPE) with high ionic conductivity (1.09 × 10 −4 S cm −1 , 40 °C) and good film-forming ability for the first time. The SPE is prepared via covalently cross-linking hyperbranched poly(glycidol) (chemical decorated by –SH, named as HPG-SH) and trimethylolpropane propoxylate triacrylate through multiple –C–S–C bonds. Specifically, the HPG is synthesized by anionic polymerization, followed by esterification reaction of HPG with mercaptoacetic acid to obtain HPG-SH. The SPE also exhibits an impressive lithium-ion transference number (0.31). Such design and prepare strategy makes the Li/SPE/LiFePO 4 cell successfully cycle and the capacity reaches 145 mAh g −1 with average coulombic efficiency close to 100% over 70 cycles at low temperature. This work offers a new perspective to design high-performance SPEs at the molecular level.
研究领域:
材料科学
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电化学
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储能技术
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高分子化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 12
·3993-4004
·
IF 8.8
Ma Yan,Fang Hui-Xue,Chen Rong,Chen Qian,Liu Sheng-Jun,Zhang Kui,Li Hai-Jin
Metal organic framework (MOF) shows great potential in the research field of photocatalysis, and it is a big challenge to achieve efficient photocatalytic activity. In this work, we have successfully grown two-dimensional MOF (2D-MOF) nanosheets on 2D-MOF nanosheets for the first time using a homometallic nodal strategy, and successfully prepared ultrathin nanosheets with tightly bound 2D/2D heterojunctions. 2D Ni-BDC nanosheets were used as carriers to grow 2D Ni-TCPP nanosheets on top of them. Ni-TCPP has a high light absorption capacity, thus extending the light absorption range of 2D/2D heterojunctions. The tight coupling of the heterojunction effectively shortens the electron transfer distance, promotes the separation of interfacial charges, and improves the photocatalytic activity. Particularly, Ni-BDC/Ni-TCPP-3 can achieve to a hydrogen production rate of 428.0 μmol·g −1 , approximately 5.75 times higher than Ni-BDC and 5.24 times higher than Ni-TCPP, respectively. Thus, 2D-MOF/2D-MOF heterojunctions provide a promising strategy for enhancing photocatalytic performance through rational heterostructure design with homometallic node strategy. Graphical abstract
研究领域:
材料科学
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纳米技术
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催化
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能量转换
✓ 已验证
DOI
高影响因子
Carbon Neutrality
·
2024
·Vol. 3
·期 1
·1-16
·
IF 0
Liu Xinghui,Naraginti Saraschandra,Zhang Fuchun,Sathishkumar Kuppusamy,Saxena Kuldeep K.,Guo Xiang
Environmental contamination by hexavalent chromium (Cr(VI)) and antibiotic drug residues pose significant challenges to public health and ecosystems. This study investigates the application of CoTiO 3 /BiVO 4 @MIL-Fe(53) (CT/BV@Fe-MOF) for the reduction of Cr(VI) and degradation of tetracycline (TCL) under visible light. After grafting an iron-based metal–organic framework MIL-Fe(53) on a modified CoTiO 3 /BiVO 4 composite, the photogenerated electrons could easily be transferred from CoTiO 3 to BiVO 4 /Fe-MOF species via interfacial charge transfer. UV–vis diffuse reflectance spectroscopy showed that charge carriers were formed in response to visible light absorption. The effect of different operating parameters, including catalyst load, pH, initial Cr(VI), and TCL concentration, was systematically evaluated during the photocatalytic process. The CT/BV@Fe-MOF composite exhibited 98.7% reduction efficiency in Cr(VI) (50 ppm) and 97.5% degradation efficiency towards TCL (30 ppm) within 90 min, resulting in a greater efficiency than the pristine CoTiO 3 , BiVO 4 , and Fe-MOF materials. The CT/BV@Fe-MOF composite displayed excellent stability over six cycles, highlighting its potential for practical applications. In addition, the plausible degradation pathway of TCL was evaluated using LC-ESI/MS analysis, while the TEST program was utilized to investigate the toxicity of the products generated during the degradation process.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
Nanomanufacturing and Metrology
·
2023
·Vol. 6
·期 1
·1-11
·
IF 0
Chao Jiaqi,Chen Faze,Xia Lei,Cai Zexin,Wang Fujun,Tian Yanling,Zhang Dawei
Generally, re-entrant structures are a key part of fabricating superoleophobic surfaces, and this structure appears in almost all kinds of published research articles regarding superoleophobicity. However, the application of related fabrication methods is usually too complex and costly in real practice. In this paper, we present a simple method to generate micro-cauliflower structures, which work as re-entrant structures in microcone arrays, to promote the formation of superoleophobic surfaces. The heating process after alkali-assisted surface oxidation is the main reason for the appearance of a micro-ball structure, and the oxidation time can influence the size of the micro-ball. To the best of our knowledge, the influence of the heating process after alkali-assisted surface oxidation on the birth of the micro-ball structure is seldom researched. A low-surface-energy treatment was also analyzed in influencing the size of the re-entrant structure and its relative wettability. Droplets of 5 μl of n -decane show contact angles of 155 ± 1°on the as-prepared superoleophobic surface, and air pockets can be clearly seen underneath, indicating a stable Cassie contacting state and a promising application value in the near future.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
Animal Diseases
·
2021
·Vol. 1
·期 1
·1-13
·
IF 0
Yang Xiaoqi,Fu Yang,Wu Lianfeng,Li Antong,Ji Luyao,Li Hao,Peng Yuxuan,Zhang Jiabin,Zhou Donghai,Zhou Huiping
The major cause of pulmonary vascular remodeling in broilers is abnormal proliferation of vascular smooth muscle cells (VSMCs), and one of the main causes of pulmonary hypertension syndrome (PHS) in broilers is pulmonary artery vascular remodeling. Forty Arbor Acres (AA) broilers were randomly divided into four groups ( n = 10): a control group (deionized water, 0 g/L NaCl), a freshwater group (FW, deionized water + 1 g/L NaCl), highly salinized freshwater group 1 (H-SFW-1, deionized water + 2.5 g/L NaCl) and highly salinized freshwater group 2 (H-SFW-2, deionized water + 5 g/L NaCl). The results of in vivo experiments showed that vascular smooth muscle of the broilers could be significantly proliferated by intake of high-salinity fresh water (H-SFW-1 & H-SFW-2), which significantly increased the content of angiotensin II (Ang II) and the expression of angiotensin II type 1 (AT1) receptor protein. Meanwhile, it significantly decreased the expression of dopamine receptor D4 (DRD4) protein. The results of in vitro experiments showed that exogenous Ang II induced the proliferation of primary VSMCs in broilers, which could be significantly inhibited by DRD4 agonists (D4A, HY-101384A) and enhanced by DRD4 inhibitors (D4I, HY-B0965). In addition, the results of immunoblotting and fluorescence quantitative PCR showed that AT1 receptors could be negatively regulated by DRD4 in VSMCs of broilers, either at the transcriptional or translational level. At the same time, the expression of AT1 receptor could be increased by DRD4 inhibition by D4I and decreased by DRD4 activation by D4A. The negative regulatory effect of DRD4 on AT1 receptor occurred in a dose-dependent manner. These results indicate that long-term intake of highly salinized fresh water can cause PHS in broilers, accompanied by varying degrees of proliferation of pulmonary artery smooth muscle. This mechanism may involve response of its receptor being induced by increased Ang II, while DRD4 can negatively regulate it.
研究领域:
兽医学
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生理学
·
分子生物学
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药理学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 36
·期 1
·1-14
·
IF 2.8
Han Xinghai,Song Guihong,Luo Di,Wu Yusheng,You Junhua
Mg 3 Bi 2 /Mg/Mg 2 Sn multilayer films with varying modulation periods were deposited on single crystalline Si substrate by alternating sputtering using high pure metal Mg, Mg 3 Bi 2 and Mg 2 Sn targets. The chemical and phase composition, surface and cross section image and thermoelectric performance of deposited films were observed, measured and studied. The results revealed that the deposited films were comprised of an evident layered structure containing the metal Mg, the Mg 2 Sn and the Mg 3 Bi 2 layer. The modulation period affected the carrier transport and thermoelectric properties of multilayer films. Carrier concentration, mobility, electrical conductivity and thermal conductivity of the multilayer films decreased with increasing heterogeneous interface, which severely scatter the carriers and phonon, reducing mobility and thermal conductivity. An increase in the Seebeck coefficient, power factor ( PF ), and thermoelectric figure of merit ( ZT ) was obtained by reducing modulation period. At room temperature, the film, which possessed the shortest modulation period of 677 nm, had a maximum ZT value of about 0.26. The carrier and phonon scattering processes were significantly strengthened by the more layer interface, enhancing the deposited film’s thermoelectric figure of merit.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 9
·1-13
·
IF 2.8
Gong Zonggui,Wang Nanlan,Guo Haoxuan,Zhu Peishu,Wang Qijing,Yu Hang,Zhang Yu,Gao Min,Zheng Xinghua
Due to the increasingly urgent safety and energy density concerns of lithium-ion batteries, more and more attention has been attracted by the Li 7 La 3 Zr 2 O 12 (LLZO)-based solid electrolytes with high ion conductivity and chemical stability against Li-metal. However, to prepare the high-quality LLZO ceramic electrolyte with high-ion conductivity and density, there is still a big challenge of the serious “Li-loss” and the abnormal grain growth during the long-time high-temperature sintering process. A novel covered sintering method is put forward to prepare the high-quality Mo-doped LLZO (LLZMO) ceramic electrolyte. The sintering strategy effectively suppresses the Li-loss to obtain the LLZMO dense ceramics with cubic garnet phase and tight grain boundaries. The LLZMO ceramics sintered at lower temperature of 1050 °C for 2 h via the novel covered sintering exhibit high density ( ρ r = 92.3%) and high-ionic conductivity of 6.08 × 10 –4 S cm −1 at 25 °C, which are close to those of LLZO-based ceramics prepared by hot pressing sintering, ultrafast high-temperature sintering (UHS). The novel covered sintering provides an energy-saving, low-cost and high-efficient strategy to prepare the high-quality LLZO-based ceramics electrolyte.
研究领域:
材料科学
·
固态电解质研究
✓ 已验证
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-13
·
IF 3.9
Liu Shuai,Quan Lin,Yang Mei,Wang Dan,Wang Yong-Zhong
In this study, the effect of polyethylene glycol 8000 (PEG8000) stress on cellulase biosynthesis in Trichoderma reesei CICC2626 via calcium signaling was investigated, and a plausible mechanism by which intracellular Ca 2+ regulates the transcription of cellulase genes was proposed. The results indicated that the total cellulase (filter paper-hydrolyzing activity [FPase]), endoglucanase (carboxymethyl cellulase activity [CMCase]), and β-glucosidase activities of the strain were 1.3-, 1.2-, and 1.3-fold higher than those of the control (no PEG8000 addition) at a final concentration of 1.5% (w/v) PEG8000. Moreover, the transcriptional levels of cellulase genes, protein concentrations, and biomass increased. With the synergistic use of commercial cellulase and T. reesei CICC2626 cellulase to hydrolyze alkali-pretreated rice straw, the released reducing sugar concentration reached 372.7 mg/g, and the cellulose content (22.7%, 0.32 g) was significantly lower than the initial content (62.5%, 1.88 g). Transcriptome data showed that 12 lignocellulose degradation–related genes were significantly upregulated in the presence of 1.5% PEG8000. Furthermore, the addition of Ca 2+ inhibitors and deletion of crz1 (calcineurin-responsive zinc finger 1-encoding gene, which is related to the calcium signaling pathway) demonstrated that calcium signaling plays a dominant role in PEG8000-induced cellulase genes overexpression. These results revealed a link between PEG8000 induction and calcium signaling transduction in T. reesei CICC2626. Moreover, this study also provides a novel inducer for enhanced cellulase production. Key points • Cellulase biosynthesis in Trichoderma reesei could be enhanced by PEG8000 • PEG8000 could induce a cytosolic Ca 2+ burst in Trichoderma reesei • The activated calcium signaling was involved in cellulase biosynthesis Graphical abstract
研究领域:
微生物学
·
生物化学
✓ 已验证
DOI
高影响因子
APOPTOSIS
·
2024
·Vol. 29
·期 9
·1679-1695
·
IF 6.1
Fan Aoyu,Li Yunpeng,Zhang Yunyan,Meng Wei,Pan Wei,Chen Meixi,Ma Zhongliang,Chen Wei
Prostate cancer (PCa) is one of the most common cancers affecting the health of men worldwide. Castration-resistant prostate cancer (CRPC), the advanced and refractory phase of prostate cancer, has multiple mechanisms of resistance to androgen deprivation therapy (ADT) such as AR mutations, aberrant androgen synthase, and abnormal expression of AR-related genes. Based on the research of the AR pathway, new drugs for the treatment of CRPC have been developed in clinical practice, such as Abiraterone and enzalutamide. However, many areas in this pathway are still worth exploring. In this study, single-cell sequencing analysis was utilized to scrutinize significant genes in the androgen receptor (AR) pathway related to CRPC. Our analysis of single-cell sequencing combined with bulk-cell sequencing revealed a substantial downregulation of AR-regulated AFF3 in CRPC. Overexpression of AFF3 restricted the proliferation and migration of prostate cancer cells whilst also increasing their sensitivity towards enzalutamide, while knockdown of AFF3 had the opposite effect. To elucidate the mechanism of tumor inhibition by AFF3, we applied GSVA and GSEA to investigate the metabolic pathways related to AFF3 and revealed that AFF3 had an impact on fatty acids metabolism and ferroptosis through the regulation of ACSL4 protein expression. Based on correlation analysis and flow cytometry, we can speculate that AFF3 can impact the sensitivity of the CRPC cell lines to the ferroptosis inducer (RSL3) by regulating ACSL4. Therefore, our findings may provide new insights into the mechanisms of drug resistance in CRPC, and AFF3 may serve as a novel prognostic biomarker in prostate cancer.
研究领域:
肿瘤学
·
分子生物学
·
基因组学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 2
·812-824
·
IF 4.705
Tian Haizhou,Cheng Sha,Zhen Jianghong,Lei Ziqiang
In arid areas, the rapid evaporation of water leads to severe water shortage for plant growth. Superabsorbent polymers have the prospect of preventing water evaporation because of its excellent water absorbency. However, insufficient in salt resistance, water retention, and swelling rate limit its application. Herein, we fabricated Hydroxyethyl cellulose-g-(Acrylic acid-co-2-Acrylamido-2-methyl-1-propane sulfonic acid)/laterite (HEC-g-P (AA-co-AMPS)/laterite) with exceptional abovementioned performances by aqueous solution polymerization. Under optimal synthesis conditions, the water absorbency of the superabsorbent polymer were 1294 g/g, 177 g/g, and 119 g/g in distilled water, tap water, and 0.9 wt% NaCl solution, respectively. The water retention of the superabsorbent polymer was still as high as 97.7% after 16 h at 25 ℃, the water absorbency was up to 832 g/g after re-swelling for 5 times at 40 ℃, and the water absorption reached swelling equilibrium was only 5 min. We investigated the effect of the mount of swollen hydrogel on the water evaporation rate in soil, and the results showed that hydrogels were effective in inhibiting soil water evaporation. Our study provides a new horizon for the application of superabsorbent polymer.
研究领域:
材料科学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）