Materials
·
2017
·Vol. 10
·期 4
·411
·
IF 2.654
Jing Zhao,Ming Zeng,Kaiqiang Zheng,Xinhua He,Minqiang Xie,Xiaoyi Fu
Thermoresponsive P(NIPAM-AA)/Fe3O4/SiO2microspheres with surface holes serving as carriers were prepared using p-Fe3O4/SiO2microspheres with a thermoresponsive copolymer. The p-Fe3O4/SiO2microspheres was obtained using a modified Pickering method and chemical etching. The surface pore size of p-Fe3O4/SiO2microspheres was in the range of 18.3 nm~37.2 nm and the cavity size was approximately 60 nm, which are suitable for loading and transporting biological macromolecules. P(NIPAM-AA) was synthesized inside and outside of the p-Fe3O4/SiO2microspheres via atom transfer radical polymerization of NIPAM, MBA and AA. The volume phase transition temperature (VPTT) of the specifically designed P(NIPAM-AA)/Fe3O4/SiO2microspheres was 42.5 °C. The saturation magnetization of P(NIPAM-AA)/Fe3O4/SiO2microspheres was 72.7 emu/g. The P(NIPAM-AA)/Fe3O4/SiO2microspheres were used as carriers to study the loading and release behavior of BSA. This microsphere system shows potential for the loading of proteins as a drug delivery platform.Keywords:P(NIPAM-AA);Fe3O4/SiO2hollow microspheres;holes;drug release
研究领域:
材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
H. Zhang,J. Xu,S. Wang,Q. Liu,X. Kong
Iron-based nanostructured materials are desirable for various applications owing to their high magnetization. Herein, we presented a facile fabrication of free-standing γ-Fe 2 O 3 nanosheets by a molten salt method for microwave absorption. Furthermore, Al component was incorporated to serve as the template for hole production. The designed holey γ-Fe 2 O 3 nanosheets were effective to maximize the usage of nanomaterials, thereby providing larger surface area, richer defects, and more polarization centers. Both experimental measurements and electric field simulation showed an enhanced capability for microwave absorption using holey γ-Fe 2 O 3 when compared with its intact counterpart. Oxygen vacancy was generated during the hole evolution, which significantly improved the electrical conductivity and thus promoted the conductive loss mechanism. In addition, the holey configuration may extend the transmission path of microwave and confer it with multiple reflection and scattering within the absorbent matrix. Meantime, the polarization loss was strengthened owing to Al modulation associated with the induced defect sites. With the improvement in conductive loss, polarization, impedance matching, and attenuation constant, the as-synthesized holey γ-Fe 2 O 3 exhibited promising microwave absorbability, with a maximum reflection loss of 52.4 dB and an effective bandwidth of 5.12 GHz at a thickness of 2.2 mm, overperforming most pure Fe-based materials.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ying Wang,Zaiwen Lin,Jiahui Zhu,Jingyuan Liu,Jing Yu,Qi Liu,Rongrong Chen,Ying Li,Jun Wang
Efficiently capturing of uranium (VI) [U(VI)] from seawater elicits unparalleled attraction for sustaining the uplifted requirement for nuclear fuel. However, obtaining the abundant U(VI) resource from seawater has always seriously restricted by competitive adsorption from higher concentrations of competitors, especially vanadium (V) [V(V)]. Herein, based on amidoximized natural bamboo strips with hierarchical porous structure, the molecular-level uranyl-specific “nano-holes” was co-constructed by the intramolecular hydrogen bonds for specifically trapping U(VI) from seawater. Manipulating the branched degrees of amino groups enabled the creation of a series of the molecular-level uranyl-specific “nano-holes” that exhibit ultrahigh affinity and selective adsorption of U(VI) with a adsorption capacity 1.8 fold higher compared to that of V(V) after 30 days floating in the Yellow Sea basin, conquering the long-term challenge of the competitive adsorption of V(V) for amidoxime-based adsorbents applied to extract U(VI) from seawater. The diameter of the molecular-level uranyl-specific “nano-holes” is approximately 12.07 Å, significantly larger than (UO 2 ) 3 (OH) 3 + (10.37 Å) and smaller than HV 10 O 28 5- , thereby exhibiting specifically trapping of U(VI) in a series of adsorption experiments with different U(VI)-V(V) ratios. Besides, the adsorption model based on the combination of experimental and theoretical results is accompanied by "hydrogen bond breaking and coordination bond formation".
研究领域:
环境科学
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材料科学
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核能技术
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DOI
PubMed
高影响因子
Journal of the Korean Ceramic Society
·
2023
·Vol. 60
·期 5
·830-839
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IF 2.5
Li Xiaohong,Luo Xiaoyu,Li Jing,Li Jinxia,Yang Jiahao,Ahmad Zahoor,Bao Zhihao,Zhang Xiao,Chen Jianjun
An appropriate infusible method plays a vital role as one of the key processes of the fabrication of polymer-derived ceramic fibers. In this work, ozone curing, a novel room temperature controllable curing strategy was used to prepare SiCN ceramic fibers. Some circular pores were observed on the surface of the obtained SiCN ceramic fibers. The tensile strength of the fibers was also investigated. To reveal the ozone-curing mechanisms of the PSZ fibers and the formation process of the circular pores, the FT-IR, SEM, OM, XRD and TG were characterized. The results showed that the Si–H bonds and Si-CH 3 groups in the PSZ molecule were oxidized gradually to form oxygen-containing groups such as Si–OH, Si–O-Si and C = O in the ozone curing process, which contributed to the curing and weight gain of the PSZ fibers. Moreover, a hydrolysis reaction between Si-NH-Si and H 2 O might further accelerate the curing of the PSZ fibers. An unexpected result of the hydrolysis reaction is the formation of some circular pores on the surface layer of the PSZ fibers. This strategy provides a method to design, adjust and control the microstructure and composition of silicon-based ceramic fibers, and the obtained SiCN fibers may be used as catalyst support, bacterial culture and other fields.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuai Wang,Anzhe Wang,Pan Gao,Rui Bai,Junjie Liu,Peng Zhou,Dazhao Liu
Strength prediction under the action of pores is crucial for the safety of ceramics. Here, a quantitative prediction model of pore-strength response under mode-I loading was developed based on the new mapping relationship between stress intensity factor and tip radius. The new model was proved to have great application after comparison and analysis of the pore-strength test data of three typical ceramics as well as the pertinent data as-reported in the literature. Results indicated that when the tip radius of pore ( ρ ) exceeds the critical value ( ρ c = K Ic 2 /(π σ 0 2 )), the stress intensity factor increases as a power function with increasing ρ , at which point the strength decay is significantly weakened, and when the ρ is lower than the ρ c , the pore can be equated to a crack problem. This work can not only forecast and assess the failure strength of ceramics containing pores, but also provide guidance for the design of extremely dependable ceramics.
研究领域:
材料科学
·
力学工程
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DOI
高影响因子
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 16
·2300045
·
IF 5.4
Yimin Luo,Boran Hao,Jingbo Li,ZhiPeng Liu,Yujie Yang,Litao Chen,Shuaikang Liu,Zhuangzhu Luo
In this work, a simple anti-fingerprint strategy (reduced ≈40–60%) to rearrange fingerprint droplets by patterned micro/nano-pore/spoons texture, air cushion and low surface energy is reported. Superior to previous precise and complex preparation methods, the micro/nano-texture are fabricated through conventional process of spray and dip. The pore and spoon can be freely switched by changing the process. The number (N) and size (r) of pores and spoons are controlled intelligently by solvent volatilization and interfacial tension ( γ FP/PU − H 2 O ${{\bm{\gamma }}_{{\rm{FP/PU}}{\bm{ - }}{{\rm{H}}_2}{\rm{O}}}}$ and γ FP/PU − Solvent ), the key for pore/spoon's forming and expanding. A physical model of interface intelligent controlling the micro/nano-pore/spoon surface texture induced by “Vacancy-Capture” is proposed. The description is being reported, for the first time, to the knowledge, expecting to make it possible to prepare anti-fingerprint engineering materials with newly potential industrial applications on optical device for large-scale in the future.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
Nanoscale
·
2020
·Vol. 13
·期 1
·300-310
·
IF 6.895
Lei Yang,Lanqiong Yang,Kun Ma,Yu Wang,Tong Song,Liliang Gong,Jian Sun,Ling Zhao,Zhihong Yang,Jianmei Xu,Qing Wang,Guogang Li,Wei Zhou
A dielectric film with a trilayer structure is fabricated to obtain both a high dielectric constant and superior electrical breakdown strength simultaneously. The outer layers of the trilayered composite film are composed of barium titanate (BTO) particles dispersed in poly(vinylidene fluoride) (PVDF) to ensure a relatively high dielectric constant, while the central layer of the composite film consists of exfoliated hexagonal boron nitride nanosheets (BNNS) dispersed in PVDF to provide high electrical breakdown strength. Compared with pristine PVDF, the dielectric constant and breakdown strength are simultaneously enhanced due to the sandwich structure, and the dielectric loss is maintained at a low level. Most important of all, positron annihilation lifetime spectroscopy (PALS) is applied to study the atomic-scale free volume holes of PVDF composite films and the effect of free volume holes on the dielectric constant and breakdown strength. Results show that the size of free volume holes of PVDF increased with the addition of BTO, but it decreased firstly and then increased with the BNNS loading. The correlation between dielectric properties and the size of free volume holes of the PVDF matrix was discussed in each layer. It is illustrated that the experimental dielectric constant of the PVDF/BTO single-layered film is consistent with the theoretical value at a lower BTO loading but smaller than the theoretical value at a higher BTO loading, which is probably ascribed to the increased size of free volume holes. The breakdown strength of the PVDF/BNNS film increased with the introduction of BNNS and the reduced size of free volume holes, which is ascribed to the reduced partial discharge phenomenon. The atomic-scale microstructure analysis based on free volume holes provides valuable ideas and new understanding for the study of the mechanism of the dielectric behaviour of polymer composites.
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
BIOMATERIALS
·
2024
·
IF 12.8
Zhaodi Liu,Yihang Ding,Yuan Ding,Weilin Wang,Zhengwei Mao,Lisha Yu
Tissue adhesives have attracted significant interest in the field of hemostasis. However, challenges including weak tissue adhesion, inadequate biocompatibility, and instability limit their clinical applications. Here, we have developed a gelatin-DOPA-knob/fibrinogen hydrogel inspired by the fibrin polymerization and mussel adhesion, resulting in a biocompatible bioadhesive with outstanding adhesion performance and great storage stability. This strategy involves modifying gelatin with knob peptides and catechol groups inducing crosslinking with fibrinogen to form a hydrogel via knob-hole interactions, and enhancing interfacial adhesion performance by interacting with the blood-covered tissue through catechol groups and knob peptides. This hydrogel exhibits rapid gelation, enhanced mechanical strength and adhesion properties, compared to the commonly used fibrin glue in surgery. The hydrogel significantly reduces the time required to hemostasis and the amount of blood loss in severe hemorrhage models. It ensures superior hemostatic efficacy, excellent biocompatibility, and long-term storage stability, which holds significant promise in medical settings.
研究领域:
生物材料
·
组织工程
·
止血
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
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