Chemical Science
·
2025
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IF 7.4
Huifa Meng,Kaijin Chen,Chuying Li,Longfei Zhang,Yanwei He,Zining Zhao,Peixin Wu,Hai Zhu,Zhenguo Chi,Jiarui Xu,Siwei Liu,Yi Zhang
Traditional photosensitive polyimide (PSPI) materials require a high curing temperature and exhibit low transparency, limiting their applications in thermally sensitive optical devices. To overcome this challenge, soluble photosensitive polyimide resins were synthesized based on the structural design of bio-based magnolol monomer. It is noteworthy that the PI photoresist, developed by using the as-prepared polyimides and non-toxic solvents (2-acetoxy-1-methoxypropane, PGEMA) and other additives, demonstrated an impressive low-temperature curing performance (180 °C). Furthermore, the solvent residue presents in the cured film using PGEMA as solvent was markedly decrease when compared to that of the cured film using N-methyl pyrrolidone (NMP). In addition, the C-PI-3 films cured by photoinitiated thiol-ene radical reactions exhibited high transparency with an average visible light transmittance of 87.8 %, as well as excellent thermal stability, dielectric and breakdown properties, and photo-patternable capabilities. This partially bio-based and innocuous solvent-based PSPI with low-temperature curable and high transparency properties could be a pioneering example to resolve the challenges of energy efficiency and environmental sustainability, and are expected to be used in the field of color filters.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 15
·12325-12332
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IF 2.22
Yang Yan,Li Jie,Zhang Huaiwu,Wang Gang,Gan Gongwen,Rao Yiheng
The development of miniaturized high frequency ferrite ceramics is attracting widely interest for next generation MLCI (multi-layer chip inductors). However, there exist short comings in the microstructure adversely affecting magnetic properties. In this study, 0.5 wt% MnO 2 - x wt% Bi 2 O 3 ( x = 0.1, 0.5, 1.0, 1.5, 2.0, and 3.0) were introduced into NiCuZn ferrites to adjust the microstructure at low temperatures. Also, the microstructure changes and high frequency magnetic properties of NiCuZn ferrites were investigated via controlling the addition of MnO 2 –Bi 2 O 3 and sintering temperatures. SEM results indicated that quantitative MnO 2 can suppress abnormal grain growth when optimized amount of Bi 2 O 3 was added. In addition, various amounts of Bi 2 O 3 were added to adjust the magnetic properties by controlling grain growth. Results revealed that 0.5 wt% MnO 2 -1.5 wt% Bi 2 O 3 composite addition is a critical point to enhance the homogeneity of the samples. Also, interestingly, the dominant contribution to dynamic magnetization mechanism changes from spin rotation to domain wall motion when the content of Bi 2 O 3 is greater than 1.0 wt%. Finally, fine microstructure of NiCuZn ferrites with high permeability ( μ ′ ≈ 291), high saturation magnetization ( M s ≈ 58.83 emu/g), high saturation flux density ( B s ≈ 290.04), high Q factor (~ 75) and enhanced cutoff frequency (~ 60 MHz) can be obtained sintered at 925 °C. Thus, this work may provide new guidance for developing RF frequency LTCC NiCuZn ferrite ceramics.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 42
·14886-14894
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IF 7.059
Chao Huang,Jinhui Li,Deliang Sun,Rui Xuan,Yuying Sui,Tingyu Li,Liang Shang,Guoping Zhang,Rong Sun,Ching Ping Wong
Over the last few years, low-temperature curing polyimide (PI) has turned out to be a significant target for the advanced electronic package. Although the curing accelerators have been confirmed to be capable of significantly decreasing the curing temperature, their effects on properties have not been comprehensively examined. In this study, polyamide acid is synthesized by pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA), and the process of low-temperature imidization is investigated by introducing six accelerators, i.e., quinoline (QL), isoquinoline (IQL), 2-methyl quinoline (2-QL), 4-methyl quinoline (4-QL), 8-methyl quinoline (8-QL), as well as 5,6,7,8-tetrahydroquinoline (THQL). As revealed from the results, the polyimide films formed using 4-QL and QL have exhibited prominent mechanical, thermal, and electrical properties. For the PI-4-QL, the tensile strength is 151.87 MPa, elongation-at-break reaches 161.36%, and the weight loss of 5% is observed at 533 °C; for the PI-QL, the tensile strength is 134.82 MPa, elongation-at-break reaches 145.16%, and the weight loss of 5% reaches 545 °C. As indicated from the results, the boiling point, acidity and molecular structure of the low-temperature curing accelerators show significant effects. Lower acidity and steric hindrance between the accelerator and amide bond facilitate the low-temperature imidization of polyamide acid. Furthermore, the as-prepared low-temperature cured PIs of 4-QL and QL would exhibit wide applications in advanced packaging industry.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Zhilong Han,Shuping Li,Mengjun Sun,Renjie He,Wei Zhong,Chuang Yu,Shijie Cheng,Jia Xie
The mass fraction of electrolytes is the crucial factor affecting the energy density of lithium-sulfur (Li-S) batteries. Due to the high porosity within the C/S cathode, high concentration of polysulfides, and side reaction in lithiun metal anode under lean electrolyte, it is extremely challenging to improve performance while reducing the electrolyte volume. Here, we report a novel electrolyte with relatively low density (1.16 g cm −3 ), low viscosity (1.84 mPa s), and high ionic conductivity, which significantly promotes energy density and cyclability of Li-S batteries under practical conditions. Moreover, such electrolyte enables a hybrid cathode electrolyte interphase (CEI) and solid electrolyte interface (SEI) layer with plentiful LiF, which leads to fast kinetics of ions transport and stable cyclability even under low temperatures. Compared to Li-S batteries in electrolyte employing 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) diluent, the ultra-thick cathode (20 mg cm −2 ) shows a high capacity of 9.48 mAh cm −2 and excellent capacity retention of 80.3% over 191 cycles at a low electrolyte-to-sulfur ratio ( E / S = 2) and negative-to-positive capacity ratio ( N / P = 2.5), realizing a 19.2% improvement in energy density in coin cells (from 370 to 441 Wh kg −1 ) and a high energy density up to 467 Wh kg −1 in pouch cells. This study not only provides guidance for the electrolyte design but also paves the way for the development of high performance Li-S batteries under practical conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weixia Lv,Caijian Zhu,Jun Chen,Caixia Ou,Qian Zhang,Shengwen Zhong
In this work, the solvent and lithium salt are modified simultaneously to improve the low temperature performance of the electrolyte. The butyl acrylate (BA) with low melting point and high dielectric constant is combined with the ethylene carbonate (EC) with high dielectric constant and excellent film-forming property, which used as mixed additives. On the other hand, the LiBF 4 with small ion size and large ion mobility is chose to mixed with LiPF 6 with best comprehensive performance, which are used as mixed lithium salts. The BA + EC + LBF mixed additives improves the solubility, conductivity and melting point of the electrolyte, and effectively improves the composition, thickness and uniformity of the CEI film, which together increased the capacity and voltage platform of the batteries at low temperatures. The discharge capacities of BA16%+EC10%+0.3 M LBF battery at −10, −20, −30 and −40 °C are 173.1, 156.0, 147.0, and 119.3 mAh/g respectively, which are much higher than the batteries with the electrolyte without adding additives (122.0, 107.8, 95.7, and 74.3 mAh/g respectively). Furthermore, BA + EC + LBF can form a porous and thin LiF CEI film on the cathode surface, which is very favorable for transport of Li + , further improve the behaviors of the batteries at different low temperatures. Even in the case of charging and discharging at −40 °C, its discharge capacity can be stably maintained at 85 mAh/g. The BA + EC + LBF mixed additives used in this work as an effective strategy to improve the comprehensive behaviors of the battery at low temperatures, which would provide a new insight to design high performance of low temperature electrolyte.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Xiang Li,Jindong Hu,Meng Wu,Chaochao Guo,Long Bai,Jinming Li,Yuwei Li,Dehao Luo,Jiamin Duan,Xiaoli Li,Zhiguo Li
Promoting and enhancing the transport rate of multivalent electrolyte ions in the pores of electrode is central for constructing high-performance electrochemical devices . Herein, waxberry-like porous carbon with nanosheets packaged by spherical carbon particles is produced by adjusting separation of hydrophilic and hydrophobic parts of carbon source precursors. The carbon particles maintain their original morphology after KOH activation at high temperature, forming tunable pores (pore volume: 0.9386 cm 3 g −1 ) on the surface of stacked nanosheet layers. Benefiting from the synergistic effect of structural features, an interfacial transport of aqueous zinc ions within the carbon electrodes is achieved, endowing the assembled zinc-ion hybrid supercapacitors (ZHSCs) with excellent energy storage performances, including high capacity (122.3 mAh g −1 at 0.1 A g −1 ), high energy density (97.78 Wh kg −1 ), large power density (8000 W kg −1 ), and cycling stability up to 10,000 cycles with capacity retention of 98%. Moreover, the ZHSCs show superior low-temperature performance and operability (78.27 mAh g −1 at −30 °C and three-time cycling stability between −20 and 20 °C without performance degradation). This work presents a new prospect on design and development of aqueous rechargeable zinc-ion energy storage devices that are available for a range of environmental conditions.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shan Huang,Xialei Lv,Xingwang Lai,Jinhui Li,Yao Zhang,Siyao Qiu,Guoping Zhang,Rong Sun
Low-temperature curable photosensitive polyimide (PSPI) materials have attracted widespread attention in advanced packaging, serving as key insulating dielectric materials in redistribution layer (RDL) to avoid wafer warpage. Considering PSPI and copper together formed the core RDL part, the adhesion between PI and copper need to be concerned to realize high reliability. However, the exploration of novel diamines with desirable characteristics such as low temperature curing ability, improved adhesion and excellent lithography properties was limited. We designed a new diamine with fluorine-containing pyridine side group named PyFNH 2 , which facilitated preparation of low-temperature curable polyimide (at 200 °C) with remarkable degree of imidization (≥95.9 %). Secondly, the coordination interaction between pyridine side group and copper enhanced adhesion strength. Thirdly, the PI films cured at 200 °C exhibited favorable dielectric properties compared to control films without PyFNH 2 , because of the introduction of electronegative fluorine atoms and rigid side groups. Apart of these, the PI films possessed fairly good thermal and mechanical properties. Significantly, negative-tone PSPI employing the precursor poly (amic ester) with PyFNH 2 was successfully prepared and cured at 200 °C, enabling precise lithography patterns with line resolutions down to 3 µm. Our findings highlight promising application potential of PyFNH 2 in photolithography technology, offering a feasible strategy for structure designs of low-temperature curable diamine.
研究领域:
材料科学
·
微电子技术
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Zhiyuan Cai,Zhengce An,Haozhang Huang,Yu Zhao,Bo Zhou
Upconversion based nanothermometry has received much attention due to its merits of stability, narrow band emission and rich emission peaks. However, the previous works are mainly based on the emissions from thermally coupled energy levels which is theoretically limited by Boltzmann distribution theory with resultant low temperature sensitivity in particular at ultralow temperatures. Here we report a LiYF 4 :Yb/Ho@LiYF 4 core-shell nanostructure to improve the sensitivity at low temperatures by taking advantage of non-thermally coupled energy levels of Ho 3+ . In detail, the green upconversion emission of Ho 3+ shows an increase with reducing temperature while its red upconversion emission presents a decline during the same process. This is primarily due to the suppression of the non-radiative multi-phonon relaxation occurred at the green emitting levels ( 5 F 4 , 5 S 2 ) and the intermediate level ( 5 I 8 ) at low temperatures. Such a feature contributes to a high relative sensitivity of 7.17%/K at 11 K, much higher than reported values. Our results provide a promising candidate for the development of nanothermometer with high-sensitive low-temperature sensing performance.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Yang Dong,Ning Zhang,Zhaodong Wang,Jinhan Li,Youxuan Ni,Honglu Hu,Fangyi Cheng
Rechargeable aqueous zinc (Zn) batteries hold great promise for large-scale energy storage, but their implementation is plagued by poor Zn reversibility and unsatisfactory low-temperature performance. Herein, we design a cell-nucleus structured electrolyte by introducing low-polarity 1,2-dimethoxyethane (DME) into dilute 1 M zinc trifluoromethanesulfonate (Zn(OTf) 2 ) aqueous solution, which features an OTf − -rich Zn 2+ -primary solvation sheath (PSS, inner nucleus) and the DME-modulated Zn 2+ -outer solvation sheath (outer layer). We find that DME additives with a low dosage do not participate in the Zn 2+ -PSS but reinforce the Zn-OTf − coordination, which guarantees good reaction kinetics under ultralow temperatures. Moreover, DME breaks the original H-bonding network of H 2 O, depressing the freezing point of electrolyte to −52.4 °C. Such a cell-nucleus-solvation structure suppresses the H 2 O-induced side reactions and forms an anion-derived solid electrolyte interphase on Zn and can be readily extended to 1,2-diethoxyethane. The as-designed electrolyte enables the Zn electrode deep cycling stability over 3500 h with a high depth-of-discharge of 51.3% and endows the Zn||V 2 O 5 full battery with stable cycling over 1000 cycles at −40 °C. This work would inspire the solvation structure design for low-temperature aqueous batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Baozhu Chen,Zefeng Zheng,Changsong Hu,Ziyu Zengcai,Zhonghai Liu,Minglei Lu,Qingwei Meng,Tiejun Wang
The development of a highly efficient non-noble catalyst for rapid releasing of hydrogen from methanol/water at low temperature is urgent, but challenge. In this paper, the high content of graphited N-doped carbon encapsulated reducing state copper catalyst was fabricated for low-temperature aqueous reforming of methanol. The Cu@NGC-600 catalyst gives excellent hydrogen production rate of 46.15 μmol·g cat -1 ·s -1 at 190 °C, which is 4 times higher than the commercial 20 % Pt/C catalyst and 3 times higher than other reported Cu-based catalysts (such as the Cu@NC-200 catalyst). Characterization and DFT calculation results revealed that rich doping of graphite N and the synergistic effect of Cu–N strengthened the electron transfer between copper and the NC matrix, decrease the reduction temperature of catalyst, which enabled the Cu to maintain a highly reduced state of Cu 0 /Cu + during APRM for low temperature (150–190 °C) hydrogen production.
研究领域:
化学工程
·
催化材料
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhenming Chu,Weicheng Jiao,Yifan Huang,Liuyang Chen,Yongting Zheng,Rongguo Wang,Xiaodong He
The directional rebound control of droplets is of great significance in many industrial applications, such as anti-icing, self-cleaning and microfluidics devices. Various strategies of droplets directional transport have been studied at room temperature and high temperature. However, it is still a challenge to control the rebound direction of droplets without external forces at low temperature and condensation conditions, where the droplets transit to Wenzel state. Herein, two kinds of graphene-based wrinkled superhydrophobic films with regular high-low structures (RSGF) and irregular spiral structures (ISGF) are prepared. The droplets on the films are still in the Cassie state by adjusting the size of the microstructure at low temperature. More importantly, the experimental and numerical simulation results reveal that the regularity of wrinkled structures can be used to adjust the distribution of viscous forces between film and droplets, which can control the direction of droplets rebound force. On the RSGF, the impacting droplets can retract symmetrically and rebound along the vertical direction; while on the ISGF, the droplets retract asymmetrically due to the irregular spiral microstructure and the rebound direction is shifted in the fixed direction.
研究领域:
材料科学
·
流体力学
✓ 已验证
DOI
高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Ruojing Qian,Zhaoyu Xu,Xingyu Hu,Suru Liu,Yao Mai,Xinzhi Tan,Xiaofan Su,Mingyan Jiang,Wei Tang,Weidong Tian,Li Xie
Purpose A synergistic antibacterial system employing photocatalytic performance and low-temperature photothermal effect (LT-PTT) with the potential for infectious skin wound healing promotion was developed.Methods Ag/Ag2O was synthesized with a two-step method, and its physicochemical properties were characterized. After its photocatalytic performance and photothermal effect were evaluated under 0.5 W/cm2 808 nm NIR laser irradiation, its antibacterial activities in both planktonic and biofilm forms were then studied in vitro targeting Staphylococcus Aureus (S. aureus), and the biocompatibility was tested with L-929 cell lines afterward. Finally, the animal model of dorsal skin wound infection was established on Sprague-Dawley rats and was used to assess infectious wound healing promotion of Ag/Ag2O in vivo.Results Ag/Ag2O showed boosted photocatalytic performance and local temperature accumulation compared with Ag2O when exposed to 0.5 W/cm2 808 nm NIR irradiation, which therefore endowed Ag/Ag2O with the ability to kill pathogens rapidly and cleavage bacterial biofilm in vitro. Furthermore, after treatment with Ag/Ag2O and 0.5 W/cm2 808 nm NIR irradiation, infectious wounds of rats realized skin tissue regeneration from a histochemical level.Conclusion By exhibiting excellent NIR-triggered photocatalytic sterilization ability enhanced by low-temperature photothermal effect, Ag/Ag2O was promising to be a novel, photo-responsive antibacterial agent.
研究领域:
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）