JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Zelai Cheng,Xi Wang,Xingyu Huo,Yulan Jing,Hua Su
Ni 0.42-x/3 Nb x /3 Cu 0.18 Zn 0.4 Mn x Fe 1.98− x O 4− δ ( x = 0–0.1) materials, possessing a high saturation magnetization, high dielectric constant, and narrow ferromagnetic resonance linewidth, were prepared via the solid-phase reaction method. The cation distribution, as well as the dielectric and gyromagnetic properties, were studied in detail. Mn 2+ and Nb 5+ incorporated in the lattice occupy tetrahedral site, causing the redistribution of cation and the reduction of A–B superexchange interaction. This leads to an increase in saturation magnetization followed by a decrease. The introduction of appropriate amounts of Mn 2+ and Nb 5+ ions reduces the magnetocrystalline anisotropy constant | K 1 | and thus reduces the ferromagnetic resonance linewidth ( ΔH ). Furthermore, high polarisability of Mn 2+ and Nb 5+ causes the increase in the dielectric constant of the ferrites. At x = 0.08, excellent gyromagnetic and dielectric properties, including a high dielectric constant ( ε ’ = 15.4@100 MHz), high saturation magnetization (4π M s = 4577 G), and narrow ferromagnetic resonance linewidth (Δ H = 129 [email protected] GHz) for the NiCuZn ferrite, was achieved. Finally, a K-band microstrip circulator operating at 20.8 to 28 GHz was designed. The simulation showed that the isolation of the circulator in the working frequency band is greater than 20 dB, showing the potential of the prepared ferrites in microwave circulators.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Acta Biomaterialia
·
2025
·
IF 9.6
Haoyi Sun,Shan Sun,Henggang Wang,Ke Cheng,Yonghua Zhou,Xinxin Wang,Shang Gao,Jinhong Mo,Si Li,Hengwei Lin,Peng Wang
Nanohybrids combining phenylboronic acid-modified carbon dots (PCDs) and proteinase K have been engineered for addressing the formidable challenges of antimicrobial photodynamic therapy (aPDT) against bacterial biofilm infections, overcoming biofilm barrier obstruction, the limited diffusion of reactive oxygen species (ROS), and the inadequate ROS generation of traditional photosensitizers. PCDs are formulated for superior water solubility and robust singlet oxygen ( 1 O 2 ) production, mitigating issues related to dispersion and aggregation-induced quenching typical of conventional photosensitizers. The conjugation of phenylboronic acid to CDs not only enhanced 1 O 2 generation through increased electron-hole separation but also imparted strong bacterial binding capabilities to the PCDs, enabling broad-spectrum sterilization by maximizing the ROS-mediated bacterial destruction. Proteinase K, serving as a structural “glue”, actively breaks down biofilms and facilitates the deep penetration of functional PCDs, aiding effective treatment of biofilm infections. In vivo studies confirm that PCDs-proteinase K nanohybrids dramatically accelerate healing in biofilm-infected wounds by synergizing enhanced photosensitization, potent bacterial adherence, and efficient biofilm elimination and penetration. This approach highlights a straightforward strategy to significantly advance aPDT, promoting the clinical adoption of non-antibiotic methods for combating bacterial biofilm infections. Statement of Significance 1) Phenylboronic acid-modified carbon dots (PCDs) were designed for enhanced water solubility and efficient singlet oxygen generation through surface modulation, also suggesting that surface modification can improve the inherent photosensitizing activity of CDs by promoting electron-hole separation; 2) The conjugation of phenylboronic acid endowed PCDs with strong bacterial binding capabilities, enabling highly efficient and broad-spectrum sterilization by maximizing reactive oxygen species-mediated bacterial destruction; 3) Incorporation of proteinase K (PK) leveraged its specific extracellular polymeric substance degrading capability, along with the stimuli-responsive release of PCDs from the PCDs-PK nanohybrids, facilitating biofilm breakdown and enabling deeper penetration of PCDs, thereby improving the treatment of biofilm infections
研究领域:
医学
·
微生物学
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Lei Yu,Jing-qiu Hua,Hong-cheng Fan,Oduro George,Yan Lu
High cost is one of the limiting factors in the industrial production of bioflocculant. Simultaneous preparation of bioflocculant from the contaminants in wastewater was considered as a potential approach to reduce the production cost. In this study, butyronitrile and succinonitrile were verified as sole nitrogen sources for the growth of strain K. oxytoca GS-4-08 in batch experiments. Moreover, more than 90 % of the mixed nitriles could be degraded in a continuous flow reactor, and the bioflocculant could be prepared simultaneously in the effluent. All the as-prepared bioflocculants exhibited high flocculation efficiencies of over 90 % toward Kaolin solution. FTIR and XPS results further unveiled that, the bioflocculant samples with abundance of carboxyl, amine and hydroxyl groups may play an important role on adsorption of Pd 2+ . The adsorption process could be well simulated by Freundlich model, and the K f values were as high as 452.8 mg 1−1/n l 1/n g -1 . The results obtained in this study not only confirm the technical feasibility for preparation of bioflocculant from various single nitrile and/or mixed nitriles, but also promise its economic feasibility.
研究领域:
环境工程
·
微生物学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Wenlong Pang,Bin Li,Yufeng Wu,Shaonan Tian,Yu Zhang,Jun Yang
With global enforcement of plastic bans and restrictions, the biodegradable plastic, e.g., polylactic acid (PLA), has been extensively employed as a primary substitute for traditional petroleum-based plastics. However, the growing problem associated with PLA waste accumulation is posing grand environmental challenges. In addition, although PLA has the degrading property under natural conditions, the degradation process takes too long and the degradation products cannot be recycled. In this context, enzymatic degradation of PLA arouses great attention in scientific communities. This study aims at selecting the most cost-effective protease from various enzymes and optimizing the enzymolysis conditions towards the degradation of PLA. We will demonstrate that under an optimal temperature of 45 °C, a pH vale of 11, and an enzyme concentration of 0.6 mg mL −1 , the protease K would achieve a remarkable degradation efficiency (> 99 %) for PLA films within just 50 min. Finally, molecular dynamics (MD) simulation and molecular docking studies reveal the mechanism behind the protease-induced PLA degradation, providing a promising direction for waste treatment and resource utilization for future biodegradable plastics.
研究领域:
环境科学
·
生物技术
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Naien Zhang,Jie Zhang,Hong Yan,Xiaorong Guo,Qiang Sun,Ruijie Guo
To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked P O C/Si O Si/ Si O C/Si O P/P O Φ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Yingying Chen,Lifang Chen,Zhi Yang,Wenhao Wang,Pengcheng Lin,Bing Yao
The deterioration of climate exacerbates the freshwater crisis. Solar-thermal interfacial evaporation, using sunlight as a driving energy source, is a promising approach to provide an effective solution to freshwater shortages. However, the low energy conversion efficiency and expensive evaporator manufacturing are still to be resolved. Herein, a strategy of clean water harvesting by solar-absorbing germanium@k-carrageenan (Ge@CA) evaporator demonstrating superior energy conversion is proposed. The Ge nanoparticles exhibit a significant solar absorption of 92.33% to achieve efficient solar-thermal conversion. The CA hydrogel provides three-dimensional water transmission channels to the evaporating surface. Meanwhile, the Ge nanoparticles can be fabricated by a facile ball-milling method. The CA as a cheap biomass can be easily interacted with KCl to obtain the porous hydrogel. Taking the advantages of Ge nanoparticles and CA hydrogel, the Janus-type Ge@CA hydrogel evaporator can achieve an evaporation rate of 2.88 kg m −2 ·h −1 and a solar-vapor conversion efficiency of 82.65% under 1 sun irradiation. Furthermore, the evaporator can produce thermoelectricity with the output voltage of 140.95 mV and the short-circuit current of 13.32 mA, yielding a power of 1.17 W m −2 . This reported solar device has huge potential for cutting-edge solar harvesting and usage.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Wang Huan,Luo Yijia,Wang Shan,Chen Youning,Zhao Wei
Magnetized pitaya peel bio-based carbon aerogel (MCA) was prepared by hydrothermal and freeze-drying methods; then, magnetized bio-based carbon aerogel (MCKEA) was obtained by the surface functionalization of MCA with 3-amino-1, 2-propylene glycol and KH-550. MCA and MCKEA were characterized by SEM, FT-IR, and XRD. The adsorption properties of MCA and MCKEA for dyes were investigated. It showed that the adsorption capacity of MCKEA for dyes was greater than that of MCA, especially for acid chromium blue K. The adsorption of acid chromium blue K by MCKEA conforms to the pseudo-second-order kinetic model and Langmuir adsorption model. The reusability experimental results showed that MCKEA can be reused for nine times. So MCKEA is a kind of adsorbent with high efficiency, high reusability, and low cost, which has broad application prospect. Graphical Abstract
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 8
·1384-1392
·
IF 3.849
S. Ding,X. F. Yang,T. T. Deng,E. H. Song,Z. J. Ma,S. Ye,M. M. Wu,Q. Y. Zhang
Solid-solution phase K(Mn,Zn)F3 mesoporous microspheres have been successfully prepared via a simple one-pot hydrothermal method by using citrate ions as a chelating agent. Effects of the reaction time on the phase transformation and morphological evolution of the K(Mn,Zn)F3 microspheres have been carefully investigated. The results revealed that the hierarchical mesoporous spherical structures with a solid-solution phase were formed from a core–shell structure with mixed phases via the nanoscale Kirkendall effect. It is noted that Yb3+/Er3+-codoped K(Mn,Zn)F3 microspheres exhibit intense single-band red up-conversion emission with environmental responsivity upon excitation using a 980 nm laser diode, indicating a promising potential biomedical application for drug delivery.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Shi Feng,Jing Guo,Fucheng Guan,Jianbin Sun,Xuecui Song,Jiahao He,Qiang Yang
Advances in conductive hydrogels are responding to the emerging need for flexible strain sensors. However, achieving an excellent combination of injectability, conductivity, and sensing characteristics is challenging. For this purpose, suitable 3D printing inks are required to generate hydrogels with the desired morphological and functional characteristics. We composited thermosensitive kC with PVA using borax as a cross-linking agent and a source of conductive ions (Na + ) to obtain borax cross-linked PVA and kC conductive hydrogel inks. And then, the corresponding conductive hydrogels (B-PVA/kC) were successfully prepared using their thermal response behavior and freeze-thaw method. The results show that kC enables B-PVA/kC to undergo a rapid sol-gel transition when cooled from 70 °C to room temperature . The B-PVA/kC hydrogels show a fast, sensitive, and accurate response to movement. After a freeze-thaw cycle (1 F-T), the hydrogels still have good electrical conductivity and strain-sensing properties, with better strength and increased structural stability . More excitingly, this hydrogel can be printed in different shapes to fit the body better and also exhibits good sensing signals when compressed by external forces, which is expected to facilitate the personalization of flexible strain sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2018
·Vol. 9
·期 1
·1802739
·
IF 21.875
Ang Gao,Min Li,Nannan Guo,Daping Qiu,Yan Li,Senhao Wang,Xia Lu,Feng Wang,Ru Yang
Novel and low-cost rechargeable batteries are of considerable interest for application in large-scale energy storage systems. In this context, K-Birnessite is synthesized using a facile solid-state reaction as a promising cathode for potassium-ion batteries. During synthesis, an ion exchange protocol is applied to increase K content in the K-Birnessite electrode, which results in a reversible capacity as high as 125 mAh g −1 at 0.2 C. Upon K + exchange the reversible phase transitions are verified by in situ X-ray diffraction (XRD) characterization. The underlying mechanism is further revealed to be the concerted K + ion diffusion with quite low activation energies by first-principle simulations. These new findings provide new insights into electrode process kinetics, and lay a solid foundation for material design and optimization of potassium-ion batteries for large-scale energy storage.
研究领域:
材料科学
·
电化学
·
能量存储与转换
·
电池技术
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Luo Qi-Zhi,Huang Jin-Shu,Liu Teng-Yu,Yuan Ji-Li,Belousov Artem S.,Li Sheng-Kun,Yang Song,Li Hu
Photocatalytic selective synthesis of lactic acid (LA) from biomass sugars with a single heterogeneous catalyst is promising but challenging due to the multiple reaction steps involved. Herein, a K-doped C-rich red polymerized carbon nitride (RPCN) photocatalyst with uniform K/C dual sites was constructed by a molten salt template method, which was highly efficient for cascade isomerization dehydration of glucose to LA with > 90% selectivity under visible light and gentle conditions. Control experiments and theoretical calculations expounded that the introduced K/C dual sites could improve the light capture ability and photogenerated charge separation efficiency, while the K species provided sufficient Lewis acid sites (adsorption sites) for the isomerization of glucose to fructose. Meanwhile, the introduced C sites that substitute N atoms could promote electrons to be captured by adsorbed oxygen for selective generation of superoxide radicals, which was highly efficient for the scission of the C3–C4 bond in fructose, exclusively furnishing LA. Importantly, the RPCN photocatalyst was also suitable for the photocatalytic upgrading of various biomass saccharides into LA with high yields of 81.3%–95.3% and could be recycled for five consecutive cycles. The tailored construction of dual sites by localization of space charge lightens an avenue for multi-step conversion of biomass with pronounced selectivity. Graphical abstract
研究领域:
催化化学
·
可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2019
·
IF 0
Bao Li,Xinbo Wang,Yibo Gao,Bao Wang,Jinxu Qiu,Xu Cheng,Dongmei Dai
The specific capacities and power performances of conventional cathode materials are still needed to improve in order to meet the demand for electrical vehicles. Li-rich layered oxide delivers a high specific capacity, but poor rate performances. Chemical doping is an effective way to address this challenge due to the expanded crystal lattice. Unlike a single ion substitution in the literature, here Li-rich layered oxides were doped by Sn and K to achieve the favorite rate performance, where Sn and K were assumed to replace transition metal ion and Li ion, respectively. Results indicate the co-doped samples result in an increasing capacity retention by more than 40% from 107.9 (contrast sample) to 151.5 mAh g −1 (co-doped sample) at 10 C-rate. Electrochemical impedance spectroscopy (EIS) and calculated diffusion coefficient of Li + also confirmed the favorite rate performances for co-doped sample. Combining results of Rietveld structure refinement, we proposed that the reason for rate performances comes from the enlarged crystal lattices, which provides a smooth diffusion tunnel for Lithium ions during the charge/discharge processes. The as-adopted method provides a possibility to achieve the improved rate performances by co-doping big-size ions at the different crystal sites.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
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