Nature Communications
·
2018
·Vol. 9
·期 1
·1-8
·
IF 12.353
Pan Xiao-Feng,Gao Huai-Ling,Lu Yang,Wu Chun-Yan,Wu Ya-Dong,Wang Xiang-Ying,Pan Zhi-Qiang,Dong Liang,Song Yong-Hong,Cong Huai-Ping,Yu Shu-Hong
Biomimetic assembly of high-quality nanosheets into nacre-like structures can produce macroscopic films with favorable mechanical and optical performances due to the intrinsic properties and high level of ordering of the nanoscale building blocks. Natural ground mica is abundant and exhibits great application potential. However, large size and low aspect ratio greatly limit its biomimetic assembly. Moreover, exfoliation of ground mica into high-quality nanosheets remains a significant challenge. Here, we report that large-scale exfoliation of ground mica into mono- or few-layered mica nanosheets with a production rate of ~1.0 g h − 1 can be successfully achieved. The mica nanosheets are then assembled into strong biomimetic polymeric mica film that inherits the high electric insulation, excellent visible transmittance, and unique ultraviolet-shielding properties of natural mica. Its overall performance is superior to that of natural sheet mica and other biomimetic films, making the polymeric mica film a suitable substrate for flexible and transparent devices.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 1
·98
·
IF 3.236
Yaling Da,Jianxing Liu,Zixian Gao,Xiangxin Xue
In this work, a series of epoxy acrylate (EA)/mica composite coatings were synthesized through introducing mica powders of different particle size into epoxy acrylate coatings and using an ultraviolet (UV) curing technique to investigate the influence of mica particle size on the coatings. Mica powders of different particle sizes were obtained by ball-milling for 4, 8, 12, 16, and 20 h with a planetary high-energy ball mill. The particle size and morphologies of ball-milled mica powders were characterized by laser particle size analyzer and scanning electron microscopy (SEM). The results indicated that planetary ball-milling reduced the particle size of mica powders effectively. Mica powders that were un-ball-milled and ball-milled were added into the epoxy acrylate matrix by a blending method to synthesize the organic-inorganic UV curable coatings. The optical photographs of the coatings showed greater stability of liquid mixtures with smaller particle size fillers. The chemical structures of EA/mica composite coatings were investigated by Fourier transform infrared spectroscopy (FTIR), and the conversion rate of C=C bonds was calculated. The results indicated that the C=C conversion of coatings with mica powders of smaller particle sizes was higher. Tests of mechanical properties and tests using electrochemical impedance spectroscopy (EIS) showed that pencil hardness, impact resistance, and coating resistance were improved due to the reduction of mica powders particle size.Keywords:mica;ball-milled;particle size;UV curable coatings
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chitengfei Zhang,Liuyi Cai,Rong Tu,Yingqiu Zheng,Bao-Wen Li,Song Zhang
Due to its nontoxicity, suitable bandgap, high defect tolerance and high electron mobility, layered BiI 3 has been gaining attention in photoelectric device and nonlinear optics field. However, the growth of large-size single crystal 2D BiI 3 has not been achieved. Herein, the synthesis of single crystal 2D BiI 3 on mica substrate via a cooling-induced growth method is reported, with the thickness of 8 ∼ 1000 nm and a lateral dimension of 110 ∼ 1000 μm. X-ray diffraction and selected area electron diffraction demonstrate the single crystal nature of 2D BiI 3 flakes. The high temperature during heat preservation step prevents the deposition of BiI 3 vapor, and then, when proceeding to cooling-induced growth step, single crystal 2D BiI 3 flakes start to nucleate on colder mica substrate and grow up to ∼ 1000 μm (lateral dimension) rapidly. The stability test indicates the 2D BiI 3 flake decomposes with the present of both O 2 and water. Finally, the cooling rate, height of crucible, holding temperature and type of substrate have also been investigated to show the structural evolution of 2D BiI 3 flakes.
研究领域:
材料科学
·
凝聚态物理
·
纳米材料
·
晶体生长
·
光电器件
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Da Yaling,Xue Xiangxin
Ultraviolet curable composite coatings are an eco-friendly option with the absence of volatile organic compound emissions. Achieving a better interface between epoxy acrylate (EA) and mica is essential for the enhanced mechanical and barrier properties of composite coatings. This paper presents a strategy for modifying mica through in situ grafting with various silane coupling agents (KH550, KH560, and KH570) and preparing composite coatings of EA/mica using a blending method. The results indicate that the silane-modified mica exhibited enhanced compatibility with EA coatings. The mechanical properties, thermal stability, and corrosion resistance of epoxy acrylate/silane-modified mica coatings were improved compared to epoxy acrylate/unmodified mica composite coatings. KH570 was found to be the most effective modifier for enhancing these properties of the coatings. Relative to EA/unmodified mica composite coating, the impact resistance of EA/KH570-modified mica composite coatings doubled, with increases in T 5 and T 10 by 49.7°C and 9.7°C, respectively. During the 9 day monitoring period using electrochemical impedance spectroscopy, the total impedance modulus | Z | f =0.01 Hz of EA/KH570-modified mica composite coatings was discovered to be 6–9 times higher than that of unmodified mica coatings, with the R t value higher by two orders of magnitude.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2010
·
IF 1.901
Chao Yang,Peng Liu
Polypyrrole/conductive mica (PPy/CM) composites were prepared by coating polypyrrole (PPy) onto the surfaces of the conductive mica (CM) via the in situ chemical oxidative polymerization method . The encapsulating morphologies were revealed with the scanning electron microscopy (SEM) technique. The PPy/CM composites were characterized with Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The composites possess high electrical conductivity at room temperature, the weak temperature dependence of the conductivity. Based on the cyclic voltammetry and the charge/discharge behavior of the PPy/CM composites, it was found that the composites performed typical electrochemical supercapacitor behavior.
研究领域:
材料科学
·
电化学
·
聚合物复合材料
·
储能
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 11
·5860-5867
·
IF 9.6
Zhao Yu-Qing,Liu Qian,Zhou Bo-Jian,Yang Guang,Jiang Shao-Long
Two-dimensional (2D) metallic 1T-CoTe 2 has attracted considerable attention due to its fascinating physical properties and promising applications in electronics and catalysis. However, the production of high-quality 2D 1T-CoTe 2 still remains challenging. Herein, we demonstrate a methodology to realize the facile synthesis of ultrathin, high-quality CoTe 2 flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition (CVD) technique. The atomic arrangement is verified by scanning transmission electron microscopy. The theoretical calculations uncover the metallic characteristic of 1T-CoTe 2 in the 2D limit. Remarkably, the CVD-derived 2D metallic CoTe 2 flakes for the hydrogen evolution reaction (HER) catalyst exhibit admirable performance, such as an overpotential of 186 mV at 10 mA·cm −2 , a Tafel slope of 78 mV·dec −1 , an exchange current density of 69 μA·cm −2 , and negligible performance degradation after 1000 cycles. These results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe 2 . Graphical abstract
研究领域:
材料科学
·
催化化学
·
纳米科技
·
表面科学
·
能源材料
✓ 已验证
DOI
高影响因子
EMBO JOURNAL
·
2021
·Vol. 41
·期 2
·e107739
·
IF 11.598
Juan Fan,Jiawei Shi,Yong Zhang,Junwei Liu,Chenyi An,Huaying Zhu,Peng Wu,Wei Hu,Rui Qin,Danmei Yao,Xin Shou,Yibing Xu,Zhou Tong,Xue Wen,Jianpo Xu,Jin Zhang,Weijia Fang,Jizhong Lou,Weiwei Yin,Wei Chen
Stimulatory immune receptor NKG2D binds diverse ligands to elicit differential anti-tumor and anti-virus immune responses. Two conflicting degeneracy recognition models based on static crystal structures and in-solution binding affinities have been considered for almost two decades. Whether and how NKG2D recognizes and discriminates diverse ligands still remain unclear. Using live-cell-based single-molecule biomechanical assay, we characterized the in situ binding kinetics of NKG2D interacting with different ligands in the absence or presence of mechanical force. We found that mechanical force application selectively prolonged NKG2D interaction lifetimes with the ligands MICA and MICB, but not with ULBPs, and that force-strengthened binding is much more pronounced for MICA than for other ligands. We also integrated steered molecular dynamics simulations and mutagenesis to reveal force-induced rotational conformational changes of MICA, involving formation of additional hydrogen bonds on its binding interface with NKG2D, impeding MICA dissociation under force. We further provided a kinetic triggering model to reveal that force-dependent affinity determines NKG2D ligand discrimination and its downstream NK cell activation. Together, our results demonstrate that NKG2D has a discrimination power to recognize different ligands, which depends on selective mechanical force-induced ligand conformational changes.
研究领域:
免疫学
·
生物物理学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Crystals
·
2023
·Vol. 13
·期 6
·855
·
IF 2.7
Miao Jia,Qianqian Xu,Di Zhai,Mingyang Yan,Shumiao Jiang,Minxuan Tang,Dou Zhang,Wei Zhu,Yan Zhang
Pipeline leakage causes enormous safety and economic concerns; therefore, sensors which are high-performance and durable are in high demand for improving monitoring accuracy and for avoiding economic loss. In this work, mica-based flexible PZT sensors showed high sensitivity, with 140 mV N−1and 467 mV N−1for the output voltage, with regard to the tapping and bending modes, respectively. They can monitor airflow in normal conditions with high sensitivity and a linearity of 424 mV MPa−1and 0.99, respectively. In the event of a pipeline leak, the mica-based sensors exhibited a rapid response time as short as 0.578 s. Furthermore, they generated distinct voltage levels at different distances from the leakage point, thus providing valuable information for accurately locating the source of the leakage.
研究领域:
传感器与仪器
·
结构健康监测
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压电材料
·
工业安全
·
智能传感器
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 17
·2895
·
IF 5.719
Yan Bao,Bin Wang,Conghui Du,Qiuhui Shi,Wenlong Xu,Zhining Wang
Oil-polluted water has become one of the most important environmental concerns nowadays due to the increasing industrial oily wastewater and frequent oil spill accidents. Herein, a novel two-dimensional (2D) nano-mica sheets assembled composite membrane with underwater super-oleophobic properties was developed for effective oil/water separation. A 2D nano-mica sheet was synthesized by a facile solvent-assisted ultrasonic exfoliation and then the obtained 2D nano-mica sheets were co-deposited with dopamine on polyvinylidene fluoride substrate to prepare nano-mica composite membranes (NCM). The NCM is hydrophilic in air and super-oleophobic underwater (the water contact angle in the air is 37.6°, and the oil contact angle in water is 151.4°). Furthermore, the prepared NCM provided outstanding stability in different acid–base environments (pH = 1–11). Noteworthily, the oil removal rate is higher than 99.5% as the sodium dodecyl sulfate SDS-stabilized oil (soya-bean oil, mineral oil and pump oil) -in-water emulsions. Meanwhile, the NCM showed excellent reusability, as the oil removal efficiency kept at 99.0% after ten soya-bean oil-in-water or mineral oil-in-water emulsion filtration cycles. The present work paved a new way for developing a low-cost and environmentally friendly strategy for oily wastewater treatment and developed a high-increment utilization application field for natural minerals.Keywords:oil/water separation;emulsions;nano-mica sheets;2D nanomaterial composite membranes;super-oleophobicity
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Xiaoya Ding,Yi Wang,Shuiquan Han,Dun Zhang,Peng Zhang
In moist environments, indoor building materials serve as significant substrates for microbial growth. A novel ternary composite pigment of mica/TiO 2 /Cu 2 O has been developed for the coating of a photocatalyst with antibacterial and thermal insulation properties. Spectroscopic analysis and light absorption studies were employed to confirm the stable synthesis of heterojunction structures. Compared to TiO 2 and Cu 2 O, the mica-heterojunction nanosheet demonstrates exceptional antibacterial efficacy, achieving 99.99% bacterial reduction against S. aureus and E. coli within 1 h. Furthermore, real-world irradiation experiments showcase the superior cooling capabilities of the coating. Photoluminescence spectroscopy indicates that the inclusion of mica effectively suppresses electron-hole pair recombination in the heterojunction, resulting in robust photocatalytic disinfection. This study presents a structured methodology for developing a promising antibacterial thermal insulation coating.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 5
·期 3
·693-700
·
IF 5.598
Hailin Yang,An Wu,Huaxin Yi,Weiwei Cao,Jiandong Yao,Guowei Yang,Yi-Chao Zou
Two-dimensional (2D) magnetic materials are of wide research interest owing to their promising applications in spintronic devices. Among them, chromium chalcogenide compounds are some of the limited available systems that present both high stability in air and high Curie temperatures. Epitaxial growth techniques based on chemical vapour deposition (CVD) have been demonstrated to be a robust method for growing 2D non-layered chromium chalcogenides. However, the growth mechanism is not well-understood. Here, we demonstrate the epitaxial growth of Cr3Te4 nanoplates with high quality on mica. Atomic-resolution scanning transmission electron microscopy (STEM) imaging reveals that the epitaxial growth is based on nanosized chromium oxide seed particles at the interface of Cr3Te4 and mica. The chromium oxide nanoparticle exhibits a coherent interface with both mica and Cr3Te4 with a lattice mismatch within 3%, suggesting that, as a buffer layer, chromium oxide can release the interfacial strain, and induce the growth of Cr3Te4 although there is a distinct oxygen-content difference between mica and Cr3Te4. This work provides an experimental understanding behind the epitaxial growth of 2D magnetic materials at the atomic scale and facilitates the improvement of their growth procedures for devices with high crystalline quality.
研究领域:
材料科学
·
凝聚态物理
·
纳米科技
·
表面科学
·
电子显微学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 9
·2210901
·
IF 19.924
Xiao-Feng Pan,Zhiwei Bao,WenLong Xu,Huai-Ling Gao,Bao Wu,YinBo Zhu,Guan-Hua Yu,Jungen Chen,Si-Chao Zhang,Liangbin Li,Heng-An Wu,Xiaoguang Li,Shu-Hong Yu
The emerging aramid-mica nanopapers, composed of aramid nanofibers (ANFs) and mica nanosheets (Mica), exhibit superiority in the field of electrical insulation compared with commercial aramid-mica micropapers. Unfortunately, their mechanical and electrical insulating properties are still less than ideal due to insufficient control of their microstructures. Herein, it is presented that by integrating ANFs and Mica into nacre-like aramid-mica nanopapers with improved structural orderliness, densification, and interlayer interaction, simultaneously improved mechanical and electrical insulating properties are achieved. Their maximum tensile strength and breakdown strength reach ≈292 MPa and ≈176 kV mm −1 , respectively, which are superior to those of the state-of-the-art ANFs-based nanopapers. Particularly, the aramid-mica nanopapers show high resistance to high-temperature (250–300 °C) and oil-bath (100 °C) environments commonly involved in practical applications, and can be recycled many times, demonstrating their great potential as high-performance sustainable electrical insulating papers to be applied in advanced electrical equipment.
研究领域:
材料科学
·
电气工程
✓ 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）