Advanced Composites and Hybrid Materials
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2025
·Vol. 8
·期 1
·1-13
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IF 21.8
Tang Yubo,Huang Sheng,Chen Wei-chih,A Garu,Linghu Xitao,Wa Qingde,Huang Shuai,Chen Jian
Zn-Mn alloys are particularly promising biodegradable implant materials, but they are plagued by poor mechanical performance. In this work, a Zn-Mn alloy with ultrahigh strength and excellent ductility was achieved through addition of trace Mg (0.1 wt%) and equal channel angular pressing (ECAP). Specifically, the ECAP processed Zn-0.5Mn-0.1 Mg alloy exhibits an ultimate tensile strength (UTS) of 428 MPa, which is highest ever achieved in Zn-Mn-based alloys, along with a good elongation (EL) of 39%. In addition, the alloy exhibits excellent antibacterial performance against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Trace Mg addition results in the formation of Mg 2 Zn 11 and MgZn 2 nano-precipitates in the alloy, which effectively pins grain growth during dynamic recrystallization (DRX) and postpones the inverse Hall–Petch relation. Consequently, the alloy possesses quite fine grains of an average grain size (AGS) of 0.71 μm, much smaller than that of its counterpart without Mg (AGS = 2.54 μm). The ultrahigh strength of the alloy is mainly ascribed to grain boundary strengthening and precipitation strengthening. The remarkable ductility of the alloy is related to deformation twinning suppression, pyramidal < c + a > slip activation, and low dislocation density.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2024
·
IF 4.1
Wu Shan-Song,Lu Hui-Juan,Li Yi-Dong,Zhang Shui-Dong,Zeng Jian-Bing
Poly(butylene succinate) (PBS) exhibits many advantages, such as renewability, biodegradability, and impressive thermal and mechanical properties, but is limited by the low melt viscosity and strength resulted from the linear structure. To address this, vitrimeric network was introduced to synthesize PBS vitrimers (PBSVs) based on dynamic imine bonds through melt polymerization of hydroxyl-terminated PBS with vanillin derived imine containing compound and hexamethylene diisocyanate using trimethylolpropane as a crosslinking monomer. PBSVs with different crosslinking degrees were synthesized through changing the content of the crosslinking monomer. The effect of crosslinking degree on the thermal, theological, mechanical properties, and stress relaxation behavior of the PBSVs was studied in detail. The results demonstrated that the melt viscosity, melt strength, and heat resistance were enhanced substantially without obvious depression in crystallizability, thermal stability, and mechanical properties through increasing crosslinking degree. In addition, the PBSVs exhibit thermal reprocessability with mechanical properties recovered by more than 90% even after processing for three times. Furthermore, PBSV with improved melt properties shows significantly improved foamability compared to commercial PBS. This research contributes to the advancement of polymer technology by successfully developing PBS vitrimers with improved properties, showcasing their potential applications in sustainable and biodegradable materials.
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Nano Research
·
2024
·
IF 9.5
Yang Yafei,Xu Yihao,Liu Haiquan,Zhang Qi,Liu Boling,Yang Menghua,Dai Huan,Ke Zunjian,He Dong,Feng Xiaobo,Xiao Xiangheng
The oxygen evolution reaction (OER) electrocatalysts, which can keep active for a long time in acidic media, are of great significance to proton exchange membrane water electrolyzers. Here, Ru-Co 3 O 4 electrocatalysts with transition metal oxide Co 3 O 4 as matrix and the noble metal Ru as doping element have been prepared through an ion exchange–pyrolysis process mediated by metal-organic framework, in which Ru atoms occupy the octahedral sites of Co 3 O 4 . Experimental and theoretical studies show that introduced Ru atoms have a passivation effect on lattice oxygen. The strong coupling between Ru and O causes a negative shift in the energy position of the O p-band centers. Therefore, the bonding activity of oxygen in the adsorbed state to the lattice oxygen is greatly passivated during the OER process, thus improving the stability of matrix material. In addition, benefiting from the modulating effect of the introduced Ru atoms on the metal active sites, the thermodynamic and kinetic barriers have been significantly reduced, which greatly enhances both the catalytic stability and reaction efficiency of Co 3 O 4 .
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ONCOGENE
·
2024
·
IF 6.9
Meng Hui,Li Ling,Nan Manman,Ding Yi,Li Yizhen,Zhang Mingzhi
Dendritic cells (DCs) are critical mediators of antigen priming and T-cell activation. Zymogen granule protein 16 (ZG16) is demonstrated as an anti-oncogene in T-cell mediated antitumor immunity, but its effect on DCs is largely unknown. Herein, we wonder whether ZG16 affects the activation of DCs in pancreatic cancer. Firstly, the increased ZG16 expression was observed during the maturation of DCs derived from mouse bone marrow or human peripheral blood. Then, overexpression of ZG16 or exogenous introduction of recombinant ZG16 protein induced the expression of MHC II, CD86, CD84, and CCR7 on the surface of DCs, thereby facilitating the secretion of proinflammatory mediators IL-1β, IL-6, TNF-α, and IL-12/p70, supporting the promoting effect of ZG16 on DC maturation. By establishing the subcutaneous and orthotopic mouse models of pancreatic cancer, we confirmed that intraperitoneal injection of recombinant ZG16 protein (Re-mZG16) could induce tumor regression by stimulating DC maturation and enhancing antitumor responses of CD4 + , CD8 + , PD-1 + , and Ctla4+ cells. Besides, Re-mZG16 in combination with gemcitabine showed a synergistic effect in the treatment of pancreatic cancer. Mechanistically, we demonstrated that ZG16 inhibited the ubiquitination and degradation of CD40, which depended on the lectin domain of ZG16. In conclusion, this study provided a novel insight into the role of ZG16-CD40 axis in DC-based immunotherapy for pancreatic cancer.
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International Journal of Oral Science
·
2025
·Vol. 17
·期 1
·1-15
·
IF 12.2
Liu Jianing,He Junxi,Zhang Ziqi,Liu Lu,Cao Yuan,Zhang Xiaohui,Cai Xinyue,Luo Xinyan,Lei Xiao,Zhang Nan,Wang Hao,Chen Ji,Liu Peisheng,Tian Jiongyi,Liu Jiexi,Gao Yuru,Xu Haokun,Ma Chao,Bai Shengfeng,Zhang Yubohan,Jin Yan,Zheng Chenxi,Sui Bingdong,Jin Fang
Periodontal bone defects, primarily caused by periodontitis, are highly prevalent in clinical settings and manifest as bone fenestration, dehiscence, or attachment loss, presenting a significant challenge to oral health. In regenerative medicine, harnessing developmental principles for tissue repair offers promising therapeutic potential. Of particular interest is the condensation of progenitor cells, an essential event in organogenesis that has inspired clinically effective cell aggregation approaches in dental regeneration. However, the precise cellular coordination mechanisms during condensation and regeneration remain elusive. Here, taking the tooth as a model organ, we employed single-cell RNA sequencing to dissect the cellular composition and heterogeneity of human dental follicle and dental papilla, revealing a distinct Platelet-derived growth factor receptor alpha (PDGFRA) mesenchymal stem/stromal cell (MSC) population with remarkable odontogenic potential. Interestingly, a reciprocal paracrine interaction between PDGFRA + dental follicle stem cells (DFSCs) and CD31 + Endomucin + endothelial cells (ECs) was mediated by Vascular endothelial growth factor A (VEGFA) and Platelet-derived growth factor subunit BB (PDGFBB). This crosstalk not only maintains the functionality of PDGFRA + DFSCs but also drives specialized angiogenesis. In vivo periodontal bone regeneration experiments further reveal that communication between PDGFRA + DFSC aggregates and recipient ECs is essential for effective angiogenic-osteogenic coupling and rapid tissue repair. Collectively, our results unravel the importance of MSC-EC crosstalk mediated by the VEGFA and PDGFBB-PDGFRA reciprocal signaling in orchestrating angiogenesis and osteogenesis. These findings not only establish a framework for deciphering and promoting periodontal bone regeneration in potential clinical applications but also offer insights for future therapeutic strategies in dental or broader regenerative medicine.
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RARE METALS
·
2024
·
IF 9.6
Guo Qing,Wang Xiu-Jun,Wang Lin,Ye Xin,Li A-Lei,Pan Xiao-Hang,Zhong Yun-Lei,Zhang Yong,Kang Li-Xing
Crystallization, while a common process in nature, remains one of the most mysterious phenomena. Understanding its physical mechanisms is essential for obtaining high-quality crystals. Typically, crystals grown by thermal evaporation or sublimation nucleate the substrate facing the evaporation source. Here, a novel vapor micro-turbulence mass transport mechanism in the growth process of ultrathin BiOCl single crystals has been revealed. In this mechanism, the precursor vapor bypasses the solid substrate, forming micro-turbulent vaporizing flows to nucleate on the surface of the substrate facing away from the evaporation source. Considering nucleation kinetics, fast shear flows are known to cause secondary nucleation, increasing nucleation quantity while decreasing the final size of the crystals. Thus, the nucleation and growth process of BiOCl crystals are controlled by adjusting the micro-turbulence intensity to reduce shear flow energy and dilate phase distribution, resulting in BiOCl crystals with uniform distribution and regular shape. Subsequent structural and morphological characterization confirms the high crystallization quality of the obtained crystals, and the performance of the constructed solar-blind photodetectors is comparable to that of similar devices. These findings contribute to a deeper understanding of vapor mass transport and crystal growth techniques and may be useful for applications related to metal oxide crystals. Graphical abstract
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JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Wang Fangyu,Wen Yijie,Guo Xin,Zhang Xuanhao,Hu Shuai,Yuan Maohui,Han Kai
Upconversion nanomaterials have been extensively applied in many fields owing to their unique optical and electronic properties. In this work, β-NaYF 4 :Yb 3+ /Ho 3+ microcrystals were synthesized by an improved hydrothermal method. The morphology and the composition of the prepared microcrystals were experimentally investigated in detail by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Under the excitation of a 980 nm continuous-wave (CW) laser, the green (541 nm) and red (644 nm) upconversion luminescence (UCL) of Ho 3+ through the energy transfer upconversion processes assisted by the Yb 3+ ions were experimentally studied at the single-particle level. With the gradual increase of excitation intensity in the highly doped Yb 3+ microcrystals, the red UCL was enhanced significantly more than the green UCL and was dominant, resulting in the UCL color finally tuning to pure red. Comparatively, for the lightly doped Yb 3+ microcrystals, the green UCL exhibited a relatively similar increase to the red UCL. The populations of the Yb 3+ and Ho 3+ ions and transitions of the UCL were systematically demonstrated through calculation of the energy levels. Notably, a new UCL at 580 nm was observed, which was ascribed to the transition of 5 F 1 , 5 G 6 → 5 I 7 .
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Science China-Chemistry
·
2025
·
IF 9.7
Qian Zhen,Wu Hongping,Hu Zhanggui,Wang Jiyang,Wu Yicheng,Yu Hongwei
Nonlinear optical (NLO) crystals capable of controlling and manipulating light to generate coherent radiation at a variety of difficult-to-access wavelengths are essentially crucial for many high-tech applications, yet the rational design of NLO crystals with high-performance remains a great challenge. Herein, inspired by two facts, namely, hetero-anionic structures can effectively integrate the diverse property superiorities of single-anions, and T2-type supertetrahedra can exhibit enhanced polarizability compared to simple tetrahedra. We assembled multiple different [TS 4 ] (T = Zn, Sn) tetrahedra to form the hybrid T2-type supertetrahedra and successfully synthesized new hybrid T2-type supertetrahedral IR NLO crystals, Ae 5 Zn 3 Ga 2 Sn 2 S 15 (Ae = Sr and Ba), both of which exhibit intriguing NLO properties, including strong second harmonic generation responses (2.8 × AgGaS 2 –3.0 × AgGaS 2 ), wide band-gaps (2.81–2.89 eV), high laser-induced damage thresholds (∼15 × AgGaS 2 ), a broad IR transmission range (up to 14 µm), and suitable birefringence (0.048–0.051@1064 nm). More significantly, both exhibit congruent melting behavior, and a high-quality single crystal of Ba 5 Zn 3 Ga 2 Sn 2 S 15 with centimeter-level has been successfully grown using the Bridgman method. These findings strongly suggest that Ba 5 Zn 3 Ga 2 Sn 2 S 15 holds great promise as an IR NLO crystal, and the strategy for constructing hybrid T2-type supertetrahedra is effective for designing novel high-performance NLO crystals.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Li Mengqi,Li Rui,Wu Longjia,Lin Xiongfeng,Xia Xueqing,Ao Zitong,Sun Xiaojuan,Chen Xingtong,Chen Song
Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, and non-negligible viewing-angle dependence because, for QLEDs with non-red emission, the electrically optimum device structure is incompatible with single-mode optical microcavity. Here, we demonstrate that by improving the way of determining reflection penetration depths and creating refractive-index-lowering processes, the issues faced by green QLEDs can be overcome. This leads to advanced device performance, including a luminance exceeding 1.6 million nits, a current efficiency of 204.2 cd A −1 , and a T 95 operational lifetime of 15,600 hours at 1000 nits. Meanwhile, our design does not compromise light outcoupling as it offers an external quantum efficiency of 29.2% without implementing light extraction methods. Lastly, an angular color shift of Δ u’v’ = 0.0052 from 0° to 60° is achieved by narrowing the emission linewidth of quantum dots.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Yuan Ziliang,Han Bo,Liu Bing,Sun Jie,Zhou Peng,Mu Rentao,Zhang Zehui
Reductive-coupling of nitro compounds and alcohols is a sustainable route for constructing C = N bonds in organonitrogen chemicals, yet challenging due to the inertness of α-C sp3 -H bond in alcohols and the vulnerability of C = N bonds towards hydrogenation. Here, we report the surprising catalytic activity of ultrafine alkaline-earth metal oxide MgO nanoclusters (0.9 ± 0.3 nm) that efficiently activate α-C sp3 -H bonds, facilitating the transfer hydrogenation and synthesis of value-added chemicals bearing C = N bonds with high to excellent yields (86–99%). Controlled experiments and characterizations showed the crucial role of oxygen vacancies (O v ) and local Mg environment (Mg-O bond) in MgO for substrate adsorption and activation via electronic interactions between substrate’s negatively charged oxygen atoms and O v sites in MgO nanoclusters. Theoretical calculation further confirmed that O v significantly lowered the energy barrier of the hydrogen atom transfer from α-C sp3 -H in ethanol to the nitro group in nitrobenzene (29.3 vs . 52.9 kcal/mol), which is the rate-determining step with the highest energy barrier in reductive-coupling reactions. Our method not only provides an efficient and sustainable pathway for synthesizing organonitrogen chemicals with C = N bonds but also inspires the exploration of main group element catalysts as alternatives to transition metal and noble metal catalysts for organic transformations.
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Journal of Central South University
·
2024
·Vol. 31
·期 10
·3447-3462
·
IF 3.7
Kang Qian-qian,Mao Zhi-peng,Peng Li-ming,Myronyuk Oleksiy,Li Wei-hua,Wang Wei
Herein, a novel composite coating with excellent self-healing and corrosion resistance activated by photothermal responsive hollow core-shell nanofillers was developed. A photothermal nanofiller (Co 9 S 8 @Bi 2 S 3 ) with a hollow core-shell structure was synthesized and then added to polyurethane (PU) to prepare PU-Co 9 S 8 @Bi 2 S 3 composite coating. Applying 808 nm near-infrared irradiation induces a photothermal effect in Co 9 S 8 @Bi 2 S 3 , which subsequently initiates the reconstruction of reversible hydrogen bonds, facilitating the self-healing of coating scratches. The excellent photothermal self-healing performance of PU-Co 9 S 8 @Bi 2 S 3 coating was demonstrated by scratch tests and molecular dynamics simulations. The electrochemical impedance spectroscopy test results showed that the PU-Co 9 S 8 @Bi 2 S 3 coating has good self-healing and anti-corrosion properties. The low-frequency impedance modulus of the coating after three self-healing sessions was still close to 10 9 Ω·cm 2 after 30 d of immersion in seawater. This study provides a new strategy for developing multi-cycle self-healing coatings triggered by photothermal effects.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·
IF 2.3
Shang Zhihang,Li Zhiqiang,Zhou Xiang,Zhanwang Xingzhou,Nie Lifang,Liu Juncheng
High-hardness hydrophobic anti-reflection thin films were prepared by a mixture of acid-catalyzed and alkali-catalyzed sols using tetraethyl silicate (TEOS) and methyltriethoxysilane (MTES) bisilicon sources as precursors. The alkali-catalyzed SiO 2 sol and the acid-catalyzed SiO 2 sol modified with aliphatic alcohol ethoxylated ether (AEO) were synthesized firstly, and then the acid-catalyzed SiO 2 sol was doped into the alkali-catalyzed SiO 2 sol in a certain ratio to prepare the anti-reflection thin films. The effects of the doping ratio of acid-catalyzed SiO 2 sol on the microstructures and properties of thin films were investigated. The experimental results show that both the transmittance and the contact angle increase and then decrease with the increasing of the doping ratio of acid-catalyzed SiO 2 sol, and the surface hardness and adhesion are gradually enhanced. When the doping ratio of acid-catalyzed SiO 2 sol is 30%, the average transmittance of the reflectance-reducing film is 92.51% in the wavelength range of 400–1100 nm, which is 5.17% higher than that of the blank glass. The water contact angle of the reflectance-reducing film is up to 92°, and the adhesion of the film is the highest level 0. After 100 h of UV exposure, the transmittance of the film was reduced by 1.1%. Graphical
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