MOLECULES
·
2022
·Vol. 27
·期 16
·5326
·
IF 4.927
Xianwen Song,Gang Lu,Jingxing Wang,Jun Zheng,Shanying Sui,Qiang Li,Yi Zhang
Polyacrylamide has promising applications in a wide variety of fields. However, conventional polyacrylamide is prone to hydrolysis and thermal degradation under high temperature conditions, resulting in a decrease in solution viscosity with increasing temperature, which limits its practical effect. Herein, combining molecular dynamics and practical experiments, we explored a facile and fast mixing strategy to enhance the thermal stability of polyacrylamide by adding common poloxamers to form the interpenetrating network hydrogel. The blending model of three synthetic polyacrylamides (cationic, anionic, and nonionic) and poloxamers was first established, and then the interaction process between them was simulated by all-atom molecular dynamics. In the results, it was found that the hydrogen bonding between the amide groups on all polymers and the oxygen-containing groups (ether and hydroxyl groups) on poloxamers is very strong, which may be the key to improve the high temperature resistance of the hydrogel. Subsequent rheological tests also showed that poloxamers can indeed significantly improve the stability and viscosity of nonionic polyacrylamide containing only amide groups at high temperatures and can maintain a high viscosity of 3550 mPa·S at 80 °C. Transmission electron microscopy further showed that the nonionic polyacrylamide/poloxamer mixture further formed an interpenetrating network structure. In addition, the Fourier transform infrared test also proved the existence of strong hydrogen bonding between the two polymers. This work provides a useful idea for improving the properties of polyacrylamide, especially for the design of high temperature materials for physical blending.
研究领域:
材料科学
·
分子动力学
·
高分子化学
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 6
·1165
·
IF 3.352
Erdong Yao,Bojun Li
This paper presents a low-cost, high-temperature-resistant and high-strength polyacrylamide gel system formed by secondary cross-linking. The gel system (named JM186) used phenolic resin and organic zirconium as cross-linking agents, and the performance of the gel system was systematically evaluated under high temperature. The gel properties studied include: gel formation time, gel strength, thermal stability, sand-filled pipe sealing efficiency, and its microstructure. The concentration of polyacrylamide in JM186 gel system was as low as 0.3%, which can control the gelling time in a range of 1–9 h by adjusting the ratio of two cross-linking agents. It can resist temperature up to 120 °C without dehydration, and its highest gel strength can reach H grade. The modulus of elasticity (G’) and viscosity (G”) can reach 32.33 Pa and 3.25 Pa, respectively. DSC (differential scanning calorimetry) test indicated that the temperature of structural failure for this composite gel is 310.5 °C. The average sealing efficiency of the gel is 96.03% in sand-filled pipes. Finally, the gel microstructure was observed by cryo-scanning electron microscopy (Cryo-SEM). It was found that the gel system by secondary cross-linking has a dense and thickened network structure compared with the single cross-linker gel system. The gel is cross-linked by both the coordination bond and covalent bond, and the two cross-linking agents have a synergistic effect. This is the reason why the secondary cross-link gel system is better than the single-cross-linker gel system.
研究领域:
材料科学
·
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Huiying Ouyang,Xiao You,Yuanhang Yang,Meihan Ren,Qiuqi Zhang,Ruixiang Deng,Xiangyu Zhang,Jinshan Yang,Shaoming Dong
The research on high-performance electromagnetic wave absorption materials with high-temperature and oxidative stability in extreme environments is gaining popularity. Herein, the lightweight silicon carbide nanowires (SiC nws )/SiC composites are fabricated with in-situ SiC interface on one-dimensional oriented SiC nws skeleton, which collaborative configuration by 3D printing and freeze casting assembly. The constructed porous structure optimizes the impedance matching degree and scattering intensity, the maximum effective absorption bandwidth (EAB max ) of 5.9 GHz and the minimum reflection loss (RL min ) of −41.4 dB can be realized. Considering the inherent oxidation resistance of SiC, the composites present well-maintained absorption performance at 600 °C. Even at 1100 °C, the EAB max of 4.9 GHz and RL min of −30.4 dB also demonstrate the high-temperature absorption stability of the composites, indicating exceptional wave absorption properties and thermal stability. The slight attenuation can be attributed to the decrease in impedance matching capability accompanying the elevated dielectric constant. This work clarifies the impact of structure and component synergy on wave absorption behavior, and offers a novel approach to producing high-performance and high-temperature resistance ceramic-based electromagnetic wave absorption materials suitable for extreme environments.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tingting Jia,Zhen Fan,Shuai Zheng,Haoran Zhou,Hao Chen,Ning Ma,Changwei Liu
In recent years, as the electronics industry has driven the development of human civilization, flexible responsive materials have become highly favored in sensing applications. However, most flexible materials are not stable under high-temperature conditions, so only a few flexible responsive materials are suitable for high-temperature and high-strength applications. In this paper, multi-walled carbon nanotubes (MWCNTs) were added as conductive material into poly(amic acid) ammonium salt (PAAS) solutions to prepare MWCNTs/polyimide aerogel-based papers (CPs) by a simple method. The introduction of MWCNTs into the ordered multilayer folded structure of the CPs provided a conductive pathway and improved their thermal stability. When the multilayer folded structure was deformed, the MWCNTs between the layers contacted each other, increasing the number of electron transport channels and providing a larger contact area for the conductive network. When the deformation was removed, the MWCNTs in the interlayer contact zone rapidly separated, providing stable and excellent responsiveness at high temperatures (CP-2: ΔR/R 0 value of up to −0.45 at 300 °C) and favorable stability after 1000 cycles (CP-2: RV retention of 92.4 % at 25 °C and 80.5 % at 300 °C). Therefore, the prepared CPs have great application prospects in the fields of high-temperature mechanical device monitoring, sensing, and alarms.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujie Liang,Jiazhu Xu,Wenjie Sun,Tianyu Li,Changyi Dong,Yi Zhou,Hong Zheng,Yonghong Cheng,Lei Zhang
Polymer based dielectric film capacitors with enhanced energy density and high temperature resistance are urgently required to replace the general used biaxially oriented polypropylene (BOPP) dielectric counterparts in power grid and electrical vehicles. This study reports the development of sulfonated flexible epoxy polymers, which demonstrate excellent properties including high dielectric constant (4.9–6.0), low dielectric loss, high charge–discharge efficiency and desirable thermal stability. The obtained epoxy film achieves an impressive efficiency of 91.5 %, accompanied by discharge energy density up to 8.78 J/cm 3 at 550MV/m at room temperature, nearly twice that of BOPP. While the prepared film still possesses discharge energy density of 1.01 J/cm 3 at 200MV/m, even when exposed to temperatures up to 150 °C, which is nearly twice that of PEI under same conditions. Simulation results reveal that sulfonyl groups can effectively improve dielectric performance without sacrificing heat resistance of epoxy polymers. The influence of sulfonated groups and positions are figured out by constructing epoxy film with pendant and bridging sulfonyl groups. It is concluded that the enhanced dipole moments caused by pendant sulfonyl group is preferred in improving energy density, while the increased rotational energy barrier attributed to bridging sulfonyl group is critical to the enhancement of temperature tolerance. The manipulation of sulfonation in polymer dielectrics’ design introduces a deep perspective for advancing high energy storage films.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yan Xue,Honghai Long,Hong Xu,Xunyu Zhang,Bing Wei,Jun Lu
Gel treatment is a highly effective technique for conformance control, significantly managing water production and enhancing oil recovery in mature reservoirs. However, the performance of conventional hydrogel systems often deteriorates under harsh conditions such as elevated temperatures and high salinity. To overcome this limitation, we developed a hydrogel with exceptional stretchability and resilience by integrating phenyl nanospheres (PNSs) as nanocross-linkers within polyampholyte chains. The PNSs were synthesized through precipitation polymerization of divinylbenzene in a water/ethanol solvent. P(AM-AMP-DAD)PNS gels were fabricated by copolymerizing acrylamide (AM) with equimolar amounts of 2-acrylamido-2-methylpropanesulfonate sodium (AMPS-Na) and diallyl dimethylammonium chloride (DADMAC), utilizing PNSs as cross-linkers. This unique structure achieved a remarkable breaking elongation of 920% at 100 kPa and exhibited no fractures after five cycles at 400% strain. Hydrophobic interactions among PNSs created dynamic association domains, enabling reversible energy dissipation and improving mechanical robustness. The antipolyelectrolyte effect of the polyampholyte chains provided exceptional fracture resistance in ultrahigh-salinity environments. The swelling ratio of P(AM-AMP-DAD)PNS gels remained stable and even slightly increased in formation water, particularly at 130 °C, where it was 1.2 times higher than at room temperature. Furthermore, this hydrogel demonstrated long-term stability under extreme conditions (130 °C, 2.2 × 105 mg L–1 salinity, Ca2+ + Mg2+ = 1.3 × 104 mg·L–1) for up to 60 days. Core-flooding tests revealed that the fractured core, treated with P(AM-AMP-DAD)PNS particles and subjected to high-temperature aging, achieved a breakthrough pressure exceeding 6 MPa, with a plugging efficiency of 99.93%. These results confirm the hydrogel’s superior plugging performance under ultraharsh reservoir conditions, making it a promising candidate for enhanced oil recovery applications.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Liangkang Huang,Jianwei Li,Shuting Chen,Bilin Zhang,Shengping Li,Wei Fan,Qiangli Zhao,Xuman Wang
Developing a piezoelectric polymer with high-temperature resistance is crucial for fabricating flexible piezoelectric sensors that can be used under extreme conditions. Herein, we for the first time found the piezoelectric properties of polyimide (PI) nanofibers and further enhanced their output voltage characteristics by introducing a fluorine-containing hexafluorodianhydride (6FDA) unit into the PI nanofibrous matrix. The as-fabricated sensor can produce a stable piezoelectric output of 10 V with a 478.72 mV N−1 sensitivity. The response and recovery times are 15 ms, respectively, and the output can remain stable after 10,000 cycles at 15 Hz/10 N, demonstrating excellent durability. Meanwhile, the 10–30 V piezoelectric output signals generated by different actions can be accurately identified for wearable applications. Furthermore, it is found that fluorinated polyimide (FPI) prepared by electrospinning can maintain structural stability before 500 °C, and its thermal decomposition temperature is above 550 °C. Moreover, the surface morphology with high porosity and the low surface energy of F atoms endow the nanofiber film with excellent superhydrophobic properties with a water contact angle of 139.6°. This work presents PI nanofibers with high-temperature resistance and outstanding piezoelectric properties, laying a potential foundation for their application in wearable and flexible electronic devices that can be used in extreme environments.
研究领域:
材料科学
·
传感器技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 35
·期 2
·2412895
·
IF 18.5
Dedong He,Yimin Zhang,Tan Li,Dingkai Chen,Hao Wang,Lei Zhang,Jiangping Liu,Xiaohua Cao,Jichang Lu,Yongming Luo
Conversion of CO 2 and CH 4 into syngas offers a promising route to reduce emissions of greenhouse gases, which facilitates large-scale carbon fixation and boosts carbon-neutral goal. The main obstacle for CO 2 /CH 4 reforming is the lack of durable catalysts showing both high metal-exposure and high-temperature structure stability, since the reported Ni-based catalysts have difficulty in avoiding deactivation by sintering metal at high temperature. Herein, ultra-small Ni nanoparticles, which display multiple characteristics of high surface-exposure and stabilized structure, are constructed from the evolution of atomically dispersed low-valent nickel under a dually confined microenvironment. Consequently, the developed strategy can not only break the stable-exposure trade-off in heterogeneous catalysis but also provide new opportunity for the engineering of high-performance and sintering-resistant reforming catalysts as well as other durable heterogeneous catalysts.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Food Bioengineering
·
2024
·Vol. 3
·期 3
·323-336
·
IF 0
Simin Feng,Yitong Tian,Jialu Sheng,Jiahao Yu,Yang Lin,Kseniya Hileuskaya,Aliaksandr Kraskouski,Huiliang Li,Zhihong Lin,Ping Shao
In this research, nanostructured lipid carriers (NLCs) loaded with limonene were developed using various solid lipids. The impact of high temperatures on the characteristics of NLCs was investigated. NLCs exhibited zeta potential values exceeding |30| mV, indicating excellent homogeneity and stability. Increasing the carbon chain length of monoglycerides from C15 to C21 resulted in a corresponding increase in particle size of NLCs from 219.1 ± 1.1 to 243.3 ± 0.9 nm. However, the particle size remained relatively constant with an increase in the number of solid lipid carbon chains. Encapsulation efficiency of limonene increased from 66.0 ± 0.7% to 86.2 ± 0.8% with an increase in the number of solid lipid carbon chains. The result showed that more ester bonds facilitated the dissolution of the target and enhanced the interaction forces between solid lipids and the target. X-ray diffraction, Fourier transform-infra-red spectroscopy and differential scanning calorimetry analyses confirmed effective encapsulation of limonene in NLCs, resulting in good stability. NLCs prepared from various solid lipids exhibited varying properties. Glycerol triglyceride demonstrated superior stability and homogeneity of nanoparticles under high-temperature conditions compared to other solid lipids. This study provides enhancing the thermal stability of limonene-loaded NLCs and proposes a novel approach for their practical application.
研究领域:
药剂学
·
材料科学
·
食品化学
✓ 已验证
DOI
Biomaterials Science
·
2021
·Vol. 9
·期 18
·6098-6107
·
IF 6.843
Yuting Shi,Xiaoquan Ding,Yufei Cao,Haicun Zhou,Wenwen Yu,Mingsheng Liu,Juanjuan Yin,Hongbin Liu,Jingjing Wang,Congshu Huang,Chenliang Gong,Hua Wei,Guanghui Zhao
Thrombin is a serine protease known as activated coagulation factor II and is primarily applied as an effective local hemostatic agent. However, its clinical application is hindered by drawbacks, such as high sensitivity to the surrounding environment, instability and poor storage stability, easy inactivation, and low bioavailability. The biological functions of biomacromolecules in harsh environments can be preserved through biomineralization. Despite the success of biomimetic mineralization, limited consideration has been given to the mineral-based methods and the effect of various metal ions on enzyme activity. To explore an efficient technique for biomimetic mineralized thrombin, six kinds of ion/thrombin hybrid microflowers and two kinds of thrombin/MOF were synthesized in this work. The results showed that Zn-HNFs-G exhibits good hemostatic effect and maintains high enzymatic activity when exposed to high-temperature conditions. Meanwhile, Fe-HNFs-G, Thrombin@ZIF-8-G and Thrombin@MAF-7-G possess negligible enzyme protection.
研究领域:
生物医学工程
·
材料科学
·
止血
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 13
·10295-10306
·
IF 3.741
Huijia Huang,Changjiang Zhao,Fei Ding,Huan Li,Shuoqing Zhang,Xingjiang Liu,Qiang Xu
Summary Lithium-sulfur (Li-S) batteries have a great potential for the future development of energy industry. However, the high-temperature performance of Li-S batteries is still facing great challenge due to the high flammability of the electrolyte, sulfur cathode as well as the separator. The separator modification is an effective method to improve the thermal stability of separator and the electrochemical performance of Li-S batteries under elevated temperatures. However, the reported methods of separator coating are too complicated to be applied in the industrial production. Here, a novel thermo-stable composite separator (M-Celgard-p), in which a layer of silicon dioxide-poly (propylene carbonate) based electrolyte (nano-SiO 2 @PPC) with a high ionic-conductivity of 1.03 × 10 −4 S cm −1 is coated on the commercial Celgard-p separator, is prepared by using a simple dipping method. Compared to the Li-S battery assembled with Celgard-p separator, the M-Celgard-p separator combined with a sulfur/polyacrylonitrile (S/PAN) cathode can improve the electrochemical performance of Li-S batteries, especially their high-temperature stability. As a result, the (S/PAN)/M-Celgard-p/Li cell delivers a high specific capacity of 724.7 mAh g −1 at 1.0 A g −1 after 200 cycles and presents a good rate capability of 1408 mAh g −1 at 1.0 A g −1 and 1216 mAh g −1 at 2.0 A g −1 . More importantly, the (S/PAN)/M-Celgard-p/Li cell can exhibit a capacity retention ratio of 69.4% after 200 cycles at 60°C. The M-Celgard-p separator with high Li-ion conductivity can not only block the “shuttle-effect” of polysulfides during cycling but also enhance the thermal stability under elevated temperatures. This work presents a simple dipping method to prepare composite separator with excellent thermal stability, which enhance the rate performance and cyclic stability of Li-S batteries under elevated temperatures. We believe this work can provide a new way to develop more reliable Li-S batteries for practical applications.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 5
·324
·
IF 3.8
Jing Wang,Lingling Feng,Zikang Zhao,Yan Wang,Ying Zhang,Shan Song,Shengwei Sun,Junshuang Zhou,Faming Gao
Given the energy crisis and escalating environmental pollution, the imperative for developing clean new energy is evident. Hydrogen has garnered significant attention owing to its clean properties, high energy density, and ease of storage and transportation. This study synthesized four types of catalysts—FeS(DI/MB), FeS(ET/MB), Fe(DI/MB), and Fe(ET/MB)—using two distinct solution systems: DI/MB and ET/MB. The FeS(DI/MB) catalyst, synthesized using the layered solution system (DI/MB), demonstrates a uniformly distributed and dense nanosheet structure, exhibiting excellent resistance to strong bases and superior catalytic properties. The FeS(DI/MB) electrode showed OER overpotentials of 460 mV and 318 mV in 1 M and 6 M, respectively, at current densities of up to 500 mA cm−2. Under industrial electrolysis test conditions, the FeS(DI/MB) electrode required only 262 mV to achieve a current density of 500 mA cm−2, operating in a high-temperature, strong alkaline environment of 6 M at 60 °C. Furthermore, the FeS(DI/MB) electrode exhibited excellent OER catalytic activity and stability, as evidenced by a 60 h stability test These findings provide valuable insights into the preparation of iron nickel sulfide-based catalysts, and further in-depth and comprehensive exploration is anticipated to yield the excellent catalytic performance of these catalysts in the realm of electrolytic water hydrogen production.
研究领域:
化学
·
能源科学
·
材料科学
✓ 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）