ChemPlusChem
·
2023
·Vol. 88
·期 7
·e202300238
·
IF 3.4
Xingkai Peng,Xiaowei Zhao,Yuekun Hu,Lingli Guo,Yan Liu,Xiaofei Yu,Xiaojing Yang,Xinghua Zhang,Zunming Lu,Lanlan Li
Graphical By adding Zn(OAc) 2 into an amino-enriched reactant system , simultaneous optimization of both porous structure and N-doping process was achieved during the synthesis of porous carbon by the hard template method. The fabricated Zn(OAc) 2 -DCD/HPC catalysts showed excellent ORR activity in alkaline electrolytes. Nitrogen-doped carbon is considered one of the most promising oxygen reduction catalysts due to its low cost and high activity, however, it still falls short of Pt/C. In this study, we report a strategy for the preparation of highly reactive N-doped hierarchical porous carbon by primary pyrolysis using zinc acetate as a stand-alone zinc source and amino-rich reactants as carbon and nitrogen sources to introduce Zn-N x structures into mesoporous structures generated by the hard template method using the strong coordination of zinc and amino groups. Benefited from the simultaneous optimization of the hierarchical porous structure and nitrogen-doping, the half-wave potential of Zn(OAc) 2 –DCD/HPC is as high as 0.909 V vs. RHE, much better than that of commercial Pt/C catalysts (0.872 V vs. RHE). In addition, zinc-air batteries assembled with Zn(OAc) 2 –DCD/HPC (P max =198 mW cm −2 ) as the cathode exhibit higher peak power density compared to Pt/C (P max =168 mW cm −2 ). This strategy might open up new opportunities for designing and developing highly active metal-free catalysts.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 5
·248
·
IF 4.8
Ching-Wen Lou,Chun-Yu Hung,Mengdan Wei,Tingting Li,Bing-Chiuan Shiu,Jia-Horng Lin
A significant amount of research has been conducted on applying functional materials as surgical sutures. Therefore, research on how to solve the shortcomings of surgical sutures through available materials has been given increasing attention. In this study, hydroxypropyl cellulose (HPC)/PVP/zinc acetate nanofibers were coated on absorbable collagen sutures using an electrostatic yarn winding technique. The metal disk of an electrostatic yarn spinning machine gathers nanofibers between two needles with positive and negative charges. By adjusting the positive and negative voltage, the liquid in the spinneret is stretched into fibers. The selected materials are toxicity free and have high biocompatibility. Test results indicate that the nanofiber membrane comprises evenly formed nanofibers despite the presence of zinc acetate. In addition, zinc acetate can effectively kill 99.9% ofE. coliandS. aureus.Cell assay results indicate that HPC/PVP/Zn nanofiber membranes are not toxic; moreover, they improve cell adhesion, suggesting that the absorbable collagen surgical suture is profoundly wrapped in a nanofiber membrane that exerts antibacterial efficacy and reduces inflammation, thus providing a suitable environment for cell growth. The employment of electrostatic yarn wrapping technology is proven effective in providing surgical sutures with antibacterial efficacy and a more flexible range of functions.Keywords:HPC;zinc acetate;electrostatic wrapping yarns;surgical sutures
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2020
·
IF 2.717
Wentao Hu,Xi'an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Jian Wang
In this work, Fe/ZnO soft magnetic composite (SMC) is prepared successfully by sol-gel method combined with a pyrolysis process. Formation mechanism and effect of annealing on magnetic properties for the Fe/ZnO SMCs are studied in detail. The results show that Fe/zinc acetate hydrogel mixture will be decomposed into the Fe/ZnO composites by heating above 340 °C. And ZnO is well coated on the surfaces of Fe particles. The Fe/ZnO composite compact has lower total core loss and better frequency stability of magnetic permeability compared with pure Fe compact. In addition, annealing treatment shows an enhanced effect on the magnetic properties for the Fe/ZnO composite compact such as reduced coercivity and increased permeability. The annealed Fe/ZnO SMCs can keep stable magnetic permeability (26) from 50 Hz to 10 kHz, high magnetic induction (1.65 T) and a relatively low core loss of 91.11 kW/m 3 measured under a magnetic flux density of 30 mT at 10 kHz. Therefore, the Fe/ZnO soft magnetic composites prepared by the above-mentioned method provide a great potential application in electromagnetic conversion equipment.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Wenqi Yin,Ruyu Yan,Xiaoyi Zhou,Xiaojing Li,Shangyuan Sang,David Julian McClements,Long Chen,Jie Long,Aiquan Jiao,Jinpeng Wang,Zhengyu Jin,Chao Qiu
Chitosan (CS) films have poor mechanical property, low water-resistance and limited antimicrobial activity, which hinder their application in food preservation industry. Cinnamaldehyde-tannic acid-zinc acetate nanoparticles (CTZA NPs) assembled from edible medicinal plant extracts were successfully incorporated into CS films to solve these issues. The tensile strength and water contact angle of the composite films increased about 5.25-fold and 17.55°. The addition of CTZA NPs reduced the water sensitivity of CS films, which could undergo appreciable stretching in water without breaking. Furthermore, CTZA NPs significantly enhanced the UV adsorption, antibacterial, and antioxidant properties of the films, while reduced their water vapor permeability. Moreover, it was possible to print inks onto the films because the presence of the hydrophobic CTZA NPs facilitated the deposition of carbon powder onto their surfaces. The films with great antibacterial and antioxidant activities can be applied for food packaging application.
研究领域:
食品科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Chao Qiu,Baicun Chen,Wenqi Yin,David Julian McClements,Zhengyu Jin,Hangyan Ji
Pure chitosan films are relatively fragile and tend to dissolve when they come into contact with water, which limits their application in food preservation. In this study, cinnamaldehyde-tannic acid-zinc acetate (CTZA) nanoparticles and aldehyde crosslinking were used to enhance the mechanical and water barrier properties of chitosan films. Fourier transform infrared spectroscopy and X-ray diffraction analyses showed that cinnamaldehyde had been successfully grafted on the surfaces of chitosan films. The thermal stability and mechanical property of the chitosan films were greatly improved after these modifications. Compared to non-modified films, the tensile strength of modified films increased by about 1.5- and 8.2-fold under dry and wet conditions, respectively. In addition, the moisture content, swelling degree, water solubility, and water vapor permeability of the modified films were all significantly decreased after the aldehyde modification. Interestingly, the modified film showed no significant changes in dimensions after being immersed in water for 24 h. Moreover, the UV-blocking properties and antioxidant activity of the modified films were significantly enhanced. Finally, the modified films extended the shelf life of packaged beef by 5 d. These findings suggest that the modified chitosan films can be used as active packaging materials for food preservation.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-16
·
IF 2.8
Wei Lijun,Zhang Furu,Shen Yongqian,Zhang Guibin,Zhou Xuan,Xu Yingge,Ma Jiqiang
Magnetic metal/porous carbon nanofibers (CNFs) have emerged as a focal point in the study of electromagnetic wave absorbing materials because of their combined electromagnetic losses, multiple scattering, and long attenuation paths. In this work, we prepared porous Co/CNFs using electrospinning integrated with the thermal carbonization process and controlled the porous structure and fiber microwave absorption characteristics by varying the amount of zinc acetate added to the spinning solution. High temperatures led to the volatilization of Zn, creating pores and defects. This process not only increased dipole and interface polarization but also contributed to the reduction of electromagnetic waves (EMWs). When the additive amount of zinc acetate was 0.15 g, the porous Co/carbon nanofibers achieved a smallest reflection loss (RL) of −42.7 dB and an effectively bandwidth (EBW) of 4.48 GHz at a thickness of 2.5 mm. This work provides a new approach for obtaining efficient and lightweight microwave absorbing materials.
研究领域:
材料科学
·
纳米技术
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电磁学
·
微波吸收
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Meng Cao,Wen Bin Hong,Xiao Dong Yang,Xiao Jian Yan,Lei Li,Shu Ya Wu,Xiao Long Zhang,Xiang Ming Chen
The transportation of Zn 2+ in acetic acid (HOAc) or Zn(OAc) 2 water solution was considered crucial for the successful cold sintering of ZnO ceramics. However, our work shows that ZnO ceramics can even be densified by cold sintering with the aid of solid Zn(OAc) 2 ·2 H 2 O without introducing extra free water. DSC-TG analysis reveals that pure Zn(OAc) 2 ·2 H 2 O is dehydrated completely into solid Zn(OAc) 2 during heating in an open environment, while it melts in ZnO-Zn(OAc) 2 ·2 H 2 O mixture or a high-pressure and semi-closed circumstance due to the strongly suppressed dehydration. Consequently, molten Zn(OAc) 2 ·2 H 2 O acts as the transient liquid medium for the dissolution-precipitation process at over 100 °C, and plays a dominant role in the densification, microstructural evolution , and mechanical robustness of the cold-sintered ZnO ceramics. The densification mechanism is confirmed by the pressure-time curves, and reveals a novel strategy for cold sintering of water-insoluble ceramics by introducing molten hydrated salt or alkali as the transient liquid medium.
研究领域:
材料科学
·
陶瓷
·
烧结技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Ruhao Zan,Yanjun Li,Shuqiang Tao,Guowei Li,Ronghui Wu,Dingjun Liu,Donggen Peng,Yong Liu,Linfeng Fei
High-performance de/anti-icing overlayers which can be deposited on diverse surfaces offer great potential in many industrial settings and daily life, yet a versatile overlayer applicable to all-weather conditions (high humidity, low temperature, raining, snowing, etc.) is in high demand for practical applications. This study presents the fabrication and application of a superhydrophobic overlayer with a bioinspired hierarchical surface which additionally possesses photothermal and electrothermal functionalities, so it can operate as a de/anti-icing layer in extreme environments. The overlayer, with a papilla-like microstructure similar to that of a lotus leaf, features polydopamine-decorated layered basic zinc acetate microparticles distributed in the framework of multiwalled carbon nanotubes. Specifically, the overlayer is superhydrophobic, and its capability of suppressing the condensation of water droplets and growth of ice crystals is verified by both in situ environmental scanning electron microscopy observations and freezing experiments. Moreover, the overlayer can be warmed up to 74 and 105 °C under the excitation of sunlight and direct current bias, respectively, which is sufficiently high for deicing in severe weather. It is worth mentioning that the overlayer is produced by a spray-coating technique; therefore, it is suitable for large-scale deployment on arbitrary substrate materials. The findings provide insights into a new strategy for engineering multifunctional overlayers and can lead to expanding applications of composite coatings.
研究领域:
材料科学
·
表面工程
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纳米技术
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 7
·1319-1325
·
IF 2.598
Xiang Di,Lin Huiming,Ma Jie,Chen Xiang,Jiang Jingjie,Qu Fengyu
In order to enrich the variety of zinc oxide (ZnO), well-defined porous ZnO hollow microspheres (PZHM) by a mass of nanoparticles were successfully synthesized through a simple solvothermal method. Zinc acetate and 1,2-propylene glycol was used as zinc source and solvent respectively
to fabricate PZHM without the assistance of any surfactant. Upon changing the amount of zinc acetate and 1,2-propylene glycol, the morphology of the samples could be adjusted. PZHM, with 1–2 μm in diameter and 200–300 nm in wall thickness, were found to be composed of
nanoparticles that assembles to form the large surface area and highly porous samples. Gas sensing performances of the ZnO hollow spheres have been investigated, showing high sensitivity (S = 180 at 1000 ppm), low detection limit (1 ppm), fast response/recovery (8/9 s), and very good
selectivity.
研究领域:
材料科学
·
纳米技术
·
化学传感器
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Chenhong Fang,Zhi Xu,Le Li,Huijun Ouyang,Guyu Xiao
The hierarchical pore structures of carbons are significant for their properties. The template strategy is a typical pore-making approach of carbons. However, few reports on the micropore templates of porous carbons have been found. Herein, a micropore template is incorporated into a carbon precursor by adopting a post-impregnation approach for the first time, thus preparing hierarchically porous carbons. Polystyrene-b-poly(ethylene oxide) (PS-b-PEO) micelles are used as a soft template. Poly(3-aminophenyl) boronic acid-encapsulated PS-b-PEO composite micelles are assembled on the surface of graphene oxide, forming sandwich aggregations. They are immersed in a zinc acetate solution and then directly pyrolyzed into porous carbons. During pyrolysis, the PS cores of micelles are decomposed to generate abundant mesopores, while the coordinated zinc ions are reduced to zero-valent zinc and then evaporated above its boiling temperature, creating numerous micropores. This in situ-reduced metallic zinc functions as a micropore template. The resulting carbons achieve hierarchical pore structures and a high specific surface area. As an application demonstration, they show one of the best catalytic performances for the oxygen reduction reaction among metal-free doped carbons. This post-impregnation approach can be extended to apply to numerous polar carbon precursors, thus preparing many hierarchically porous carbons with abundant micropores.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BACTERIOLOGY
·
2022
·
IF 3.476
Greater Kayode Oyejobi,Dongyan Xiong,Mengjuan Shi,Xiaoxu Zhang,Hang Yang,Heng Xue,Faith Ogolla,Hongping Wei
With the increasing morbidity and mortality rates associated with multidrug-resistant bacteria, interest in bacteriophage therapy has been revived. However, bacterial resistance to phage infection threatens the usefulness of phage therapy, especially its inclusion in modern medicine. Multidrug-resistant Acinetobacter baumannii is a top-priority pathogen requiring urgent intervention and new therapeutic approaches, such as phage therapy. Here, we experimentally adapted A. baumannii WHG40004 to its lytic phage P21 and thereafter isolated a phage-resistant bacterial mutant, named Ev5-WHG. We then aimed to identify potential agents to aid phage killing of Ev5-WHG by analyzing its genome and that of the wild-type strain. The enriched Gene Ontology (GO) analysis based on genetic alterations in minor alleles and mutations showed that pathways such as zinc ion transport and cell membrane synthesis could play certain roles in phage resistance. Remarkably, the combination of zinc acetate and P21 showed increased bactericidal effect on Ev5-WHG. Significantly also, we showed that P21 completely prevented the growth of wild-type WHG40004 in the presence of antibiotics (meropenem and imipenem). The results from this study indicate that the analysis of phage resistance signatures during adaptation of bacteria to a lytic phage can inform the choice of agents to work cooperatively with phage to limit and/or reverse resistance. This approach could be important for guiding future successful phage therapy.IMPORTANCE Bacteriophages have proven very useful as alternative therapeutic agents in combating multidrug-resistant bacterial infections; however, bacterial resistance to phages threatens their use. In this study, we showed a new strategy of leveraging genetic signatures that accompany phage resistance in bacteria to predict agents that can be used with lytic phages to combat multidrug-resistant Acinetobacter baumannii. Significantly, this approach was helpful in suggesting the use of zinc acetate to reduce resistance in phage-resistant bacteria, as well as the use of phage with antibiotics meropenem and imipenem to prevent resistance in a wild-type strain of multidrug-resistant A. baumannii. The approach of this study will be helpful for improving the outcome of phage therapy and in overcoming antimicrobial resistance.
研究领域:
微生物学
·
基因组学
·
抗菌素耐药性
·
噬菌体疗法
·
细菌遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）