INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Longxiang Zhan,Huan Chen,Xichen Yu,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
High-performance polymer-based dielectric materials have attracted much attention in the field of energy storage due to high breakdown field strength and low cost. However, partial polymer-based materials are derived from traditional fossil energy derivatives, which are characterized by non-renewable and low dielectric constants, which are not conducive to the improvement of energy storage. In this paper, dissolved chitin through alkali/urea system is composited with SiO 2 prepared by electrostatic spinning. The maximum discharge energy density of the fiber composite film reaches 4.34 J cm −3 , which is 1.6 times higher than that of the micron particle composite film (2.8 J cm −3 ) and 1.9 times higher than that of the pure chitin film. The high aspect ratio and low concentration of silica filler effectively improved the breakdown field strength. In addition, the thermal stability was improved. This study paves the way for the application of bio-based materials in high-performance dielectrics.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Dandan Jia,Jie Zhao,Rui Yan,Hongyi Gao,Zhaolin Fu,Zhongpeng Zhu,Zhiping Tao
The catalytic stability has always been a bottleneck of many reactions in industrial production. The preparation of long-life hydrogenation catalysts has been a hot research topic. Herein, Ni-ZIF was first grown in situ on the surface of SiO2. N-doped Ni/C nanoparticles were uniformly distributed on the SiO2 support after the subsequent annealing process. The uniform dispersion of Ni-ZIF contributed to the high dispersion of the active metal, and the highly dispersed Ni nanoparticles were free from thick carbon layers. The highly dispersed and fully exposed Ni determined its excellent low-temperature hydrogenation activity, which was critical for the extension of the catalyst lifetime. The presence of carbon and nitrogen was also beneficial to improve the stability of the catalyst. The N-doped SiO2@Ni/C catalyst exhibited excellent stability toward the hydrogenation of DCPD under mild condition. 100% DCPD conversion and >90% THDCPD selectivity were maintained after 144 h of continuous fixed-bed operation under GHSV of 2 h–1 at 60–90 °C.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng Tang,Xueying Zhao,Jiawei Du,Mang Li,Haining Qian,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In this study, hollow Co@SiO 2 @PPy composites with excellent electromagnetic wave (EMW) absorption performance were successfully synthesized. The monodisperse hollow Co microspheres were prepared using a solvent-thermal method. The microspheres were then coated with an SiO 2 layer by a modified Stöber method. Finally, the SiO 2 layer was surface-coated by polypyrrole (PPy) through in-situ polymerization to obtain Co@SiO 2 @PPy composite materials with hollow core–shell structures. The prepared CSP2 composite achieved a minimum reflection loss (RL min ) of −65.83 dB at 1.86 mm, demonstrating an effective absorption bandwidth (EAB) of 4.84 GHz. The CSP3 composite achieved a widest EAB (EAB max ) of 5.4 GHz at a thickness of 1.83 mm, while simultaneously maintaining the RL level at −50.70 dB. Additionally, it demonstrated an RL min value of −61.66 dB with a thickness as thin as 1.66 mm. The observed shift of FTIR absorption peaks by 20 cm −1 in the PPy ring provides compelling evidence for the involvement of multilayered structures in polarization loss. The SiO 2 layer not only enhances the interface polarization but also prevents corrosion of the Co core by acidic solutions. The exceptional EMW absorption characteristics can be attributed to the effective impedance matching and the combined effect of magnetic and dielectric losses.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2024
·
IF 2.3
Hangyu Yue,Feilong Han,Ya Zhang,Chenghao Wang,Lishuai Zong,Jinyan Wang,Xigao Jian
The aramid fiber reinforced polyurethane composites (AF@PU), which exhibit high strength and lightweight characteristics, have attracted widespread concerns for advanced personal protective systems. However, the interface is essential to influence the stress transfer efficiency but frequently overlooked. In this work, polydopamine and γ-aminopropyltriethoxysilane modified SiO2 (m-SiO2) were utilized to strengthen the interface. Attributing to the strong bonding strength between fibers and polymer resins improved by m-SiO2 at the interface, the tensile, flexural, and compressive strength of m-SiO2/AF@PU are maximally increased. The deposition of abundant m-SiO2 enhances the interface roughness, the interfacial peeling strength of the m-SiO2/AF@PU is increased by 490.4%, and the interlaminar shear strength is increased by 51.1%. In addition, m-SiO2/AF@PU demonstrates the maximal energy absorption value; the ballistic limit velocity is improved from 449.8 m s−1 of AF@PU to 508.5 m s−1 of m-SiO2/AF@PU. This work highlights the interface strengthening and ballistic performance, thus providing an efficient guideline for the design of next-generation fiber reinforced polymer resin composites.
研究领域:
材料科学
·
防护工程
✓ 已验证
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-8
·
IF 12.121
Sun Yong,Sun Bo,He Jingbo,Yang Guowei,Wang Chengxin
Providing high performance electrical nano-interconnects for micro-nano electronics that are robust in harsh environments is highly demanded. Today, electrical nano-interconnects based on metallic nanowires, e.g. Ag and Cu, are limited by their positive physicochemical reactivity and ductility under large strain (i.e. irreversible dislocations and local necking-down elongation) at high temperatures or in strong oxidizing and acidic environments. Herein, to overcome these limitations, high-quality millimetre-sized soft manganese-based silicide (Mn 5 Si 3 @SiO 2 ) nanowire nanocables are designed via a glassy Si–Mn–O matrix assisted growth. The proposed nanocables exhibit good electrical performance (resistivity of 1.28 to 3.84×10 -6 Ωm and maximum current density 1.22 to 3.54×10 7 A cm −2 ) at temperatures higher than 317°C in air atmosphere, strongly acidic (HCl, PH=1.0) and oxidizing (H 2 O 2 , 10%) ambient, and under complex electric field. The proposed Mn 5 Si 3 @SiO 2 nanocables, which withstand a strain of 16.7% free of failure, could be exploited for diverse applications in flexible electronics and complex wiring configurations.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
高影响因子
IET Nanobiotechnology
·
2018
·Vol. 13
·期 3
·257-261
·
IF 2.059
Xiaoshuang Zhao,Zhenghu Ma,Honghao Sun
With the rising threat of cancers, gold nanorods (GNRs) based photothermal–chemotherapy is becoming an increasingly important strategy to cure cancers. There are some challenges faced by GNRs system including complicated synthesis process and low drug loading capacity. In this study, GNRs assisted mesoporous silica nanoparticles (GNR@SiO 2 NPs) are fabricated by a simple method. The mesoporous SiO 2 can not only prevent the aggregation of GNRs but also provide large hollow mesoporous structure to enhance drug loading capacity. Moreover, GNRs absorb near-infrared (NIR) light and convert it into heat. The temperature of the GNR@SiO 2 solution was increased to ∼60 (2 W) and 90°C (3 W) after NIR radiation. The photothermal conversion efficiency was 32.60% of GNR@SiO 2 under NIR light irradiation at 2 W, while 39.01% under NIR light irradiation at 3 W. The drug loading content of GNR@SiO 2 was 22.3 ± 2.5%, which was higher than that of most reported GNR drug delivery systems. The authors also found that the GNR@SiO 2 @ doxorubicin may have a higher drug release rate under the conditions of the tumour microenvironment. The in vitro cytotoxity of GNR@SiO 2 was demonstrated on HeLa cells. The experimental results indicate that GNR@SiO 2 has great potential for synergistic treatment to kill cancer cells.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Xue-Fen Zhang,Yi-Qing Chen,Ji-Ming Hu
One of the biggest obstacles for superhydrophobic films in applications is their poor mechanical resistance. In this research, robust superhydrophobic SiO 2 films were constructed on mild steel (MS) for corrosion protection by the combination of rough electrodeposited SiO 2 (E-SiO 2 ) films and durable polydimethylsiloxane (PDMS) polymer with low surface energy. Results show that the PDMS content has a great effect on the microtopography, wettability , roughness, and wear-resistance of the final films. EIS measurements indicate that as-prepared robust superhydrophobic E-SiO 2 /PDMS films exhibit good corrosion inhibition efficiency of up to 99.99 % for MS substrates in 3.5 wt.% NaCl solution.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2014
·
IF 1.991
Lina Liu,Hongyu Xiao,Xiuyun An,Yongsheng Zhang,Ruifei Qin,Lishuang Liu,Dongmei Zhang,Ruirui Sun,Linfeng Chen
Well-dispersed YVO 4 :Eu 3+ nanoparticles (NPs) of about 8 nm were synthesized by a precipitation reaction and they were coated with SiO 2 by a reverse microemulsion method. The thickness of SiO 2 shells was altered by changing the molar ratio of tetraethoxysilane (TEOS)/YVO 4 :Eu 3+ . The influence of SiO 2 coating on the photoluminescence properties of the YVO 4 :Eu 3+ NPs was studied in detail. With the increase of the SiO 2 shell thickness, the intensity ratio of 5 D 0 - 7 F 2 / 5 D 0 - 7 F 1 becomes lower. It was interesting to observe that the quantum yield of naked YVO 4 :Eu 3+ is higher than that of YVO 4 :Eu 3+ @SiO 2 nanocomposites, and the result is opposite to a previous reference.
研究领域:
材料科学
·
纳米技术
·
发光材料
·
光学性能
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Yong Wang,Lifang Nie,Juncheng Liu
In order to obtain the SiO 2 film with concave-convex structures by sol-gel and dip-coating, the sol mixing method was used. The effects of the sol mixing ratio on the microstructure, contact angle and transmittance of films were studied. The results show that the sol mixing significantly improved the roughness, contact angle and transmittance of SiO 2 films. As the ratio of the large-sized nano-SiO 2 particles increased, the contact angle and the transmittance of the film first increased and then decreased. Finally, the hydrophobic SiO 2 film with the contact angle of 141.38° and the transmittance of 97.55% within 380–1100 nm was prepared.
研究领域:
材料科学
·
薄膜技术
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Song Tongyang,Zhang Jianxu,Eyoka Bouma Annas Benit,Ye Linjing
Driven by renewable solar energy, biomass reforming under mild conditions for synergistic hydrogen production has emerged as a rapidly developing and promising approach, enabling not only high-purity hydrogen generation but also offering new avenues for biomass reutilization. In this work, a spherical ZCS/SiO 2 composite catalyst was fabricated by anchoring ZnCdS (ZCS) nanoparticles onto SiO 2 nanospheres via a water bath technique coupled with in situ growth. The physicochemical properties of the resulting catalyst were systematically investigated through comprehensive characterization methods, and the behavior of photogenerated charges was analyzed using photoelectrochemical measurements. Among the prepared samples, the ZCS/SiO 2 -100% catalyst exhibited the highest hydrogen evolution activity, achieving a hydrogen evolution rate of 109.16 μmol g −1 h −1 when sodium lignosulfonate, derived from the bamboo pulping process, was used as the substrate. This enhanced photocatalytic hydrogen evolution performance is primarily attributed to the introduction of SiO 2 , which increases the number of active sites and expands the contact area between the catalyst and reactants. Furthermore, a plausible photocatalytic reaction mechanism is proposed. It is anticipated that this study will provide a promising strategy for green hydrogen production, high-value conversion of organic waste, and the advancement of efficient photocatalytic materials.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhiwei Wang,Hongfeng Yin,Yun Tang,Qin Hou,Chen He,Hudie Yuan
Herein, we constructed an ordered nanoporous embedding nanoparticles composite by anodic oxidation of Ti 3 SiC 2 in fluorine containing organic electrolyte. Compared to anodized Ti which resulted in TiO 2 nanotubes , the anodized Ti 3 SiC 2 (ATSC) led to the formation of nanostructured TiO 2 /C/SiO 2 composite. The morphologies of oxides in the composite also varied with different anodization parameters. The ATSC could be directly used as an electrode without further processes, which possessed a superior structure and composition with a visible-light photocurrent density of 7.56 μA cm −2 , initial reversible area capacity of 6.18 F cm −2 , which were respectively 1.32 and 6.87 times higher than those of the anodized Ti (AT), respectively. The ATSC synthesized by such a feasible fabricating strategy shows favorable photoelectrochemical properties and remarkable stability, and may broaden the bifunctional material prospects of anodized MAX phases.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2011
·
IF 1.795
Yanjie Liang,Jun Ouyang,Hongyou Wang,Weili Wang,Pengfei Chui,Kangning Sun
In this paper, the core–shell structured SiO 2 @YVO 4 :Yb 3+ ,Er 3+ microspheres have been successfully prepared via a facile sol–gel process followed by a heat treatment. X-ray diffraction, field emission scanning electron microscopy, energy disperse X-ray spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and photoluminescence spectra were used to characterize the samples. The results reveal that the SiO 2 spheres have been successfully coated by YVO 4 :Yb 3+ ,Er 3+ phosphors to form core–shell structures and the size of obtained microspheres has a uniform distribution. Additionally, the samples exhibit bright green luminescence under the excitation of a 980 nm laser diode. The photoluminescence intensity increases with the number of coatings. These core–shell structured SiO 2 @YVO 4 :Yb 3+ ,Er 3+ microspheres may have great potential in the fields of infrared detection and display devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）