JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53573
·
IF 3.057
Hongying Hou,Baoxiang Huang,Xiaohua Yu,Jian Lan,Fangshu Chen
High thermal stability, mechanical property and electrochemical stability of polyvinylidene fluorid (PVDF) make it a promising solid electrolyte polymer matrix. However, it also faces some challenges such as low ionic conductivity, high crystallinity degree and the absence of reactive groups. Herein, PVDF powder was modified by chemical grafting amphiprotic sulfonate betaine (SB) for solid electrolyte (SB-PVDF) with high ionic conductivity and chemical stability. Furthermore, to improve the mechanical property and reduce the crystallinity degree of SB-PVDF, 3%, 6% and 9% SiO 2 nanospheres were also incorporated into SB-PVDF, and the resultant composite polymer solid electrolytes were marked as 3% SiO 2 /SB-PVDF, 6% SiO 2 /SB-PVDF, 9% SiO 2 /SB-PVDF. The results showed that 6% SiO 2 /SB-PVDF membrane exhibited the best overall performances, possibly due to the synergistic effect of amphiprotic SB modification and uniform dispersion of SiO 2 filler in PVDF matrix. For example, the solid-state battery Li//6%SiO 2 /SB-PVDF//LiFePO 4 delivered the initial discharge capacity of 153.0 mAh/g at 0.2 C and the reversible discharge capacity of 124.4 mAh/g at 1.0 C with the capacity retention rate of 93.8%, indicating high feasibility for solid-state lithium ion battery.
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Polymers
·
2023
·Vol. 15
·期 2
·466
·
IF 5
Lei Zhang,Haiqi Gao,Lixiang Guan,Yuchao Li,Qian Wang
The key to developing high-performance polymer electrolytes (PEs) is to achieve their high strength and high ionic conductivity, but this is still challenging. Herein, we designed a new double-network PE based on the nonhydrolytic sol–gel reaction of tetraethyl orthosilicate and in situ polymerization of zwitterions. The as-prepared PE possesses high strength (0.75 Mpa) and high stretchability (560%) due to the efficient dissipation energy of the inorganic network and elastic characteristics of the polymer network. In addition, the highest ionic conductivity of the PE reaches 0.44 mS cm−1at 30 °C owning to the construction of dynamic ion channels between the polyzwitterion segments and between the polyzwitterion segments and ionic liquids. Furthermore, the inorganic network can act as Lewis acid to adsorb trace impurities, resulting in a prepared electrolyte with a high electrochemical window over 5 V. The excellent interface compatibility of the as-prepared PE with a Li metal electrode is also confirmed. Our work provides new insights into the design and preparation of high-performance polymer-based electrolytes for solid-state energy storage devices.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-15
·
IF 2.8
Xiao Lijuan,Zhou Jingkai,Yu Zhixuan,Dong Huihao,Chen Yan
In the research of flexible smart electronics, obtaining particular structure electrodes to provide excellent electrochemical performance remains challenging. Here we report the synthesis and characterization of nanocomposite by a two-step method of polypyrrole (PPy) with Co 3 O 4 @SiO 2 in the presence of an oxidizing agent. Co 3 O 4 @SiO 2 was prepared by firing SiO 2 -coated zeolitic imidazolate framework-67 (ZIF-67/SiO 2 ) in a tubular furnace at a high temperature. Subsequently, PPy was coated and dispersed on Co 3 O 4 @SiO 2 by chemical methods at room temperature. In addition, we also explored the optimal ratio experiment of Co 3 O 4 @SiO 2 and PPy. The results show that the specific capacitance of Co 3 O 4 @SiO 2 and Co 3 O 4 @SiO 2 /PPy (2 mL) is 33.36 A/g and 107.7 A/g, at 0.6 A/g current density, indicating that the addition of PPy greatly improves the electrochemical performance of Co 3 O 4 @SiO 2 . This may be due to synergies between Co 3 O 4 @SiO 2 and PPy polymers, and the addition of PPy may help Co 3 O 4 @SiO 2 to construct more ion channels to enhance ion transport. This report will contribute to the development and application of cobalt oxide and silicon-shell electrode materials in the field of energy storage. It is helpful for the development and application of cobalt oxide and silicon-shell structures as electrode materials in the field of energy storage.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanyan He,Lulu Zhang,Guantong Chen,Yuanhong Liu,Shuangshuang Shi,Panpan Jiang,Jie Ding,Shu Xu,Chong Geng
Achieving long-term stable lead halide perovskite nanocrystals (PNCs) in light-emitting devices remains a significant challenge because of their fast degradation upon exposure to light, moisture, and oxygen. Here, we report a facile one-pot strategy to realize the growth of crystalline ZnO/SiO 2 dual-layer encapsulation on CsPbBr 3 PNCs. The encapsulation provides the PNCs with robust surface passivation to withstand the harsh condition in hybrid light-emitting diodes (LEDs) with an on-chip packaging structure. The PNCs/ZnO/SiO 2 could preserve 100 % of their initial photoluminescence intensity after 500 h of continuous irradiation under a 9.6 W cm −2 blue laser. The fabricated green- and white-LEDs displayed constant light intensity at 80 % of their initial value with continuous driving at 10 mA for 500 h. We believe the excellent stability of the ZnO/SiO 2 encapsulated PNCs could strongly promote the development and application of perovskite-based light-emitting and other optoelectronic devices.
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Polymers
·
2022
·Vol. 14
·期 20
·4413
·
IF 4.967
Xi Chen,Lijiaqi Zhang,Min Wu,Yong Huang
Green and sustainable cellulose-based hydrophobic coatings are increasingly the subject of scientific and industrial research. However, few researchers pay attention to preparing it by a one-step method. Therefore, a superhydrophobic coating composed of hydrophobic SiO2and cellulose nanofiber modified by 3,4-dichlorophenyl isocyanate was manufactured through one-step ball milling. It was found that the ball milling can promote SiO2dispersion and achieve the preparation of modified nanocellulose, which further disperse SiO2nanoparticles to form film or coating. Compared with the ultrasonic dispersion method, the composite coating prepared by ball milling method can obtain higher water contact angle and more stable hydrophobic properties. The hydrophobic cellulose nanofiber can load 1.5 equivalents of SiO2nanoparticles to form a uniform film with the water contact angle of 158.0° and low moisture absorption. When this nanocomposite is used as a coating material, it can impart super-hydrophobicity to paper surface with water contact angle of 155.8°. This work provides a facile way to prepare superhydrophobic nanocellulose/nanoparticles composite coatings and films, thereby broadening the ways of dispersing nanoparticles and constructing superhydrophobic coatings.Keywords:cellulose nanofiber;hydrophobic SiO2nanoparticle;composite;hydrophobic coating;optical tunable film
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 33
·25383-25391
·
IF 2.779
Zhang Cong,Liu Xiansong,Kan Xucai,Feng Shuangjiu,Zhu Yong,Yang Yujie,Zhang Zongyang
Soft magnetic composites serve in electrical applications and sustainable energy supply, the magnetic flux changes in response to changes of the applied magnetic field, with energy loss. To reduce the loss, in this paper, the soft magnetic composite Fe 50 Ni 50 powder coated with nano-SiO 2 was prepared by tetraethoxysilane sol–gel method, and the microstructure of the coating was characterized. Then, soft magnetic Fe 50 Ni 50 powder cores have been prepared, and annealed with different atmospheres. The power loss is lower when the magnetic cores were annealed in a reducing hydrogen atmosphere. The lowest power loss (1390.7 mW/cm 3 , f = 1000 kHz, B = 50 mT, 120 °C) was obtained when the cores annealed at 730 °C in H 2 atmosphere. The results show that the eddy current loss is significantly reduced by coating SiO 2 , and the power loss is reduced about 33% in high-frequency (1 MHz and 50 mT, 25 °C). From 25 to 120 °C, the power loss at 1 MHz decreases by about 33% due to the reduction of hysteresis loss and eddy current loss. The excellent properties are very applicable for the inductors of 5G technology.
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COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Yinsong Si,Jintao Sun,Fujian Liu,Huazhang Shen,Xiaoming Qi,Qiao Xu,Chengliang Zhou,Yu Liu,Yaqin Fu
Flexible composite membrane with strong strength and good thermal performances simultaneously are highly desired in broad fields. Herein, rabbit-hair-like silica/polyimide (SiO 2 /PI) composite nanofibers with super durability are prepared by a simple electrospinning and impregnating process. The embedded hollow SiO 2 microspheres and the bamboo-shaped hollow structure of the composite nanofibers endow the membrane with excellent thermal insulation , while the externally coated thin PI layer provides quite high strength without significantly reducing its thermal stability. The obtained SiO 2 /PI composite membrane demonstrates high tensile strength (19.7 MPa), good flexibility (withstanding dynamic bending at least 20000 cycles), low thermal conductivity (18.7–42.8 mW m −1 K −1 ), multi-cycle friction resistance (500 cycles) and abrupt hot/cold alternation stability (near 400 °C). These excellent properties are mainly attributed to the 3D bonding network of the composite membrane and the impregnating-reinforcing effect on single SiO 2 nanofiber. This composite membrane not only overcomes the low tensile strength and poor durability of pure SiO 2 membrane, but also possesses lightweight and fireproof properties, demonstrating broad prospects in thermal insulation, anti-shock of fire/cold and wearable protective fabrics.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yue Li,Huan Ren,Daolai Sun,Xinqiang Zhao,Satoshi Sato
Liquid-phase catalytic hydrodeoxygenation of 1,2-decanediol (1,2-DDO) to form 1-decanol was performed over various non-noble metal-loaded acidic catalysts, and Cu loaded on amorphous SiO 2 -Al 2 O 3 exhibited a high catalytic activity for the formation of 1-decanol. A high 1-decanol selectivity of 84.7% with a complete 1,2-DDO conversion was obtained within only 15 min over the Cu/SiO 2 -Al 2 O 3 at 250 °C under 10 MPa H 2 pressure. The temperature at 250 °C and the H 2 pressure higher than 3 MPa were conducive to the efficient production of 1-decanol from 1,2-DDO. In contrast to the previously reported noble metal catalysts, Cu/SiO 2 -Al 2 O 3 required a relatively high reaction temperature, while an extremely high 1-decanol productivity of 78 mmol g cat −1 h −1 could be achieved. Meanwhile, the hydrodeoxygenation of 1,2-decanediol over Cu/SiO 2 -Al 2 O 3 proceeded via a reaction mechanism in which decanal was formed as the intermediate. In addition, the Cu/SiO 2 -Al 2 O 3 catalyst was reusable at least five times without serious deactivation.
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Materials
·
2022
·Vol. 16
·期 1
·201
·
IF 3.748
Luping Tang,Chen Liao,Yingqing Guo,Yangyang Zhang
Metal nanoparticles have attracted a great deal of interest due to their unique properties of surface plasmon resonance. Metal nanoparticles can enhance the fluorescence emission intensity of quantum dots (QDs) through the local surface plasmon resonance effect, which is mainly determined by the distance between them. Therefore, it is very important to achieve controllable distance between metal and QDs, and study fluorescence enhancement. In this work, the controllable adjustment of the distance between metal nanoparticles and QDs was successfully realized by controlling the thickness of the SiO2shell of Ag@SiO2nanoparticles. Firstly, Ag nanoparticles with uniform size distribution and relatively high concentration were prepared, and then the thickness of the SiO2shell was controlled by controlling the amount of tetra-ethyl orthosilicate (TEOS) in the hydrolysis of TEOS reaction. (3-aminopropyl) triethoxysilane (APS) was used to connect CdS/ZnS QDs with Ag@SiO2nanoparticles to form Ag@SiO2@CdS/ZnS QD composite nanoparticles. The fluorescence spectra shows that the fluorescence intensity of the Ag@SiO2@CdS/ZnS QD composite nanoparticles is significantly enhanced. Photoexcitation spectra and fluorescence spectra of CdS/ZnS QD and Ag@SiO2@CdS/ZnS QD composite nanoparticles, measured under different energy excitation conditions, indicate that the existence of Ag nanoparticles can enhance the fluorescence intensity of CdS/ZnS QDs. Finally, a further physical mechanism of fluorescence enhancement is revealed.Keywords:Ag-SiO2;fluorescence enhancement;transmission electron microscope;quantum dots;photoexcitation spectra
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Small
·
2022
·Vol. 18
·期 14
·2106533
·
IF 15.153
Xin Zhang,Yumei Ran,Qianqian Fu,Jianping Ge
Traditional thermochromic photonic crystal (PC) usually has a slow and reversible thermal response, which limits its application in thermal printing. Here, the authors develop a thermochromic “SiO 2 -PC/PEG” double layer structure with a responding time of milliseconds for fast thermal printing. Controlled by the print-head, the polyethylene glycol (PEG) melts, infiltrates, and solidifies within the interparticle voids, which instantly and irreversibly changes the refractive index and produces the PC pattern. Multicolor printing can be realized by tuning the size and type of colloidal particles. Resolution as high as 300 DPI is achieved to print the high-resolution patterns and then the grayscale patterns based on the control of pixel densities. Different from fiber thermal paper, the “SiO 2 -PC/PEG” film has no toxic bisphenol A and possesses superior light stability for keeping the images longer. It is fully compatible with the commercial printer, which provides a mature solution for fast and convenient preparation of PC patterns.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Chao-Hua Xue,Ren-Xuan Wei,Xiao-Jing Guo,Bing-Ying Liu,Mi-Mi Du,Meng-Chen Huang,Hui-Gui Li,Shun-Tian Jia
Daytime radiative cooling that cools down an object by reflecting solar light and radiating heat simultaneously is expected to be a promising technology for dissipating heat without any energy consumption. However, radiative cooling materials’ solar reflection and infrared emissivity will be affected by the rain or dust pollution, therefore reducing the cooling performance under outdoor environments. A superhydrophobic radiative cooling composite film with hydrophobic SiO 2 embedded in poly(vinylidene fluoride-co-hexafluoropropene) was proposed via phase separation technology. The SiO 2 particles not only imparted to the film porous micro-nano tier rough structure to enhance the surface hydrophobicity , but also improved the mid-infrared emissivity of the film. As a consequence, the as-prepared film achieved 10.3 °C cooling under direct sunlight with convective heat reduced by transparent polyethylene film, and excellent superhydrophobicity with water contact angle greater than 160° and sliding angle close to 0°. Moreover, the cooling performance and superhydrophobicity of the film changed little after immersion in different pH solution and long-time exposure to UV irradiation. Importantly, the obtained film demonstrated great self-cleaning property making it hardly to be contaminated in outdoor environments, which is significant for sustainable applications.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinsong Zeng,Tianguang Wang,Zheng Cheng,Lu Liu,Fugang Hu
A cellulose nanofiber-SiO2 hybrid aerogel cigarette (CSG) filter, which can be used for ultrahigh adsorption of toxic substances from cigarette smoke, was prepared based on the skeletal material of cellulose nanofibers (CNFs) with the help of a simple directional frozen technology. SEM and FTIR results confirmed the successful introduction of the SiO2 nanoparticles, and the application process of SiO2 nanoparticles did not influence the three-dimensional network structure of CSGs. Considering the practical application of the CSGs on the cigarette filter, the mechanical and thermal properties of the CSGs were investigated. The stress–strain and TG curves showed that the mechanical and thermal stability properties of the CSGs increased compared with the pure cellulose nanofiber aerogel without the introduction of SiO2 nanoparticles. The adsorption capacity of the CSG filter tips against toxic substances from cigarette smoke was systematically investigated. Compared with conventional cellulose acetate filter tips, the CSG filter tips performed well at adsorption of tar, TPM (total particulate matter), nicotine, and CO from cigarette smoke with removal efficiencies of 92.23, 90.25, 95.02, and 20.63%, respectively. Crucially, the preparation of CSGs needs no extra chemical agents, showing an eco-friendly process. These results suggest that CSGs display great potential working as an ideal candidate for mainstream smoke toxicant adsorption.
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