POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Mei Wang,Jianling Xia,Jianchun Jiang,Shouhai Li,Kun Huang,Wei Mao,Mei Li
A novel liquid Ca/Zn thermal stabilizer was synthesized from tung-maleic anhydride (TMA) as feedstock and evaluated for its stabilizing effects on poly (vinyl chloride) (PVC). First, N -(3-amino-benzoic acid) tung-maleamic acid (ABTMA) was prepared from the ammonolysis of TMA and para -aminobenzoic acid (PABA). Then its complex calcium salt (ABTMA-Ca) and zinc salt (ABTMA-Zn) were synthesized through a one-step method, and investigated by Fourier transform infrared spectroscopy and elemental analysis . ABTMA-Ca and ABTMA-Zn were separately treated with diethylene glycol monobutyl ether at 120 °C for 3 h to form liquid ABTMA-Ca (LABTMA-Ca) and liquid ABTMA-Zn (LABTMA-Zn). The effects of LABTMA-Ca/LABTMA-Zn, CaSt 2 /ZnSt 2 and C36DA-Ca/C36DA-Zn on thermal stability of PVC were studied through Congo Red test, discoloration tests and dynamic thermal stability analysis. The LABTMA-Ca/LABTMA-Zn thermal stabilizer exhibit excellent long-term stability. Analysis of tensile and dynamic mechanical properties shows PVC samples stabilized with LABTMA-Ca/LABTMA-Zn and the other two Ca/Zn systems all display comparable strength , modulus and glass transition. A common stabilizing mechanism of LABTMA-Ca/LABTMA-Zn system and its radical mechanism were presented, respectively.
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
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Lidong Wang,Chensheng Ma,Qin Dai,Kangkang Li,Kaiqi Jiang
Solvent degradation is the most critical challenge of amine-based CO 2 capture technology, which necessitates the development of chemically stable amine/amine blends to mitigate the absorbent degradation for industrial application. This study experimentally examined fourteen structurally different amines, namely the relatively stable cyclic, sterically hindered, and tertiary amines, to reveal the relationship between amine structure and chemical stability. The cyclic amines with a symmetrical ring structure greatly promote their oxidative stability, whilst the asymmetrical ring structure exhibited poor performance due to its relatively high C-N bond flexibility. The potential intramolecular interaction between the parent ring and the branched chain also reduced the stability of cyclic amines. While sterically hindered amines showed desirable oxidative stability thanks to the C-N bond protection by substitutions adjacent to amino group, their stability was very sensitive to the number of chain and the type of functional group surrounding to the amino group. Thermal stability of sterically hindered amines was also less satisfactory. It is observed that the amines with a rigid C-N bond, a longer branched chain connected to parent ring, and a preferable steric hinderance substantially promote the oxidative stability, with approximately 20 times less degradation compared to the benchmark MEA. Quantum calculation of bond dissociation energies (BDEs) of hydrogen-containing bonds were performed to reveal the atom position of radical formation that initiates the amine degradation. The potential degradation pathways were further predicted based on the positions of radical formation and the calculation of reaction Gibbs energy for possible degradation reactions. The analysis of heat stable salts products and the nitrogen distribution in the degraded solutions confirmed the bond cleavage position induced by radical formation and the reaction pathways, which clarified the potential amine oxidation mechanism. This work is anticipated to provide the generic principles to evaluate and develop the chemically stable amine solvent towards long-term operation of the amine process.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Fang Yang,Jinchu Yang,Si Qiu,Wei Xu,Yuntao Wang
In this work, the stability of CP-TA complex stabilized emulsion was first characterized. It was found that the peak thickness, Turbiscan Stability Index (TSI) and droplet size of CP-TA complex stabilized emulsion gradually decreased with increasing content of TA, indicating the gradually enhanced physical stability of emulsion, which was attributed to the gradually decreased interfacial tension, zeta potential and increased viscosity of CP-TA complex. Moreover, the oxidative stability of CP-TA complex stabilized emulsion gradually enhanced with increasing of TA content due to the antioxidant activity of TA. XRD and FTIR results suggested that the interaction between CP and TA gradually enhanced with increasing content of TA in CP-TA complex, leading to the formation of larger CP-TA clusters shown in AFM results. In conclusion, the presence of tannic acid (TA) enhanced the physical and oxidative stability of chitin particles-tannic acid (CP-TA) complex stabilized oil in water emulsion.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Optical Materials Express
·
2018
·Vol. 8
·期 11
·3494-3505
·
IF 2.566
Yujun Xie,Yan Yu,Junyi Gong,Cheng Yang,Pan Zeng,Yurong Dong,Bilin Yang,Rongqing Liang,Qiongrong Ou,Shuyu Zhang
Room temperature recrystallization is an intriguing method of fabricating CsPbX3 perovskite quantum dots since it does not involve high temperature or inert atmosphere, offering a promising route to the mass production of CsPbX3 quantum dots at low cost. However, their performance stability during work was seldom investigated and was far from the requirements for practical applications. Here, we demonstrate a facile and low-cost method to significantly improve the thermal, photo- and water stability of room-temperature synthesized perovskite quantum dots by effectively suppressing the unfavored grain growth and surface trap states. The fabricated quantum dots of green-emitting CsPbBr3 and red-emitting CsPbBr1.2I1.8 were applied for quantum dot-converted white LEDs, which are capable of achieving a wide color gamut of 135% NTSC and 101% Rec. 2020.
研究领域:
材料科学
·
显示技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Xueli Zhang,Yuhao Wu,Chao Liu,Xu Guo,Yulan Gao,Ningyang Li
Walnut oil (WO), often referred to as "Oriental olive oil," is renowned for its numerous biological benefits, including memory enhancement and the prevention of cardiovascular and cerebrovascular diseases. However, WO is prone to oxidation during processing, which leads to a decline in oil quality. Due to the weak functional properties of walnut protein isolate (WP), a WP-gum acacia (GA) conjugate (WP-GA) was prepared by modifying the WP surface to stabilize walnut oil emulsion. Results showed that WP-GA, at a concentration of 2 g/100 g protein, could form a stable and fully emulsified emulsion. Compared to the walnut protein-stabilized emulsion (WP-WO), the WP-GA conjugate-stabilized WO emulsion (WP-GA-WO) exhibited larger particle size, a higher absolute zeta potential, reduced turbidity, and a higher percentage of adsorbed protein. Rheological analysis revealed that WP-GA-WO had a higher energy storage modulus compared to WP-WO, indicating improved elasticity and viscosity due to glycosylation of the emulsion. Additionally, the WP-GA-WO emulsion demonstrated enhanced thermal, pH, ionic strength, salt stress, and storage stability, as evidenced by delayed oxidation of α-linolenic acid and linoleic acid. In vitro digestion assays showed that the WP-GA conjugate emulsion had better stability in gastric juices. These findings suggest potential applications for WP and GA in food-related fields..
研究领域:
食品科学
·
胶体与表面化学
·
营养学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lin Yuan,Yufeng Zhou,Ze Wang,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. However, their performance stability has been far from the requirements, and this type of material is toxic to the environment after degradation. In this paper, a hot injection strategy was used to prepare a CsPbX 3 perovskite NC solution, wherein the photoluminescence quantum yield (PLQY) of CsPbBrI 2 reached 78% and that of CsPbBr 3 was 63%. Then, CsPbX 3 NCs are successfully adsorbed on natural layered mineral pyrophyllite for improving heat, light, and water stability. Monodispersed CsPbX 3 NCs are evenly distributed on the surface of the pyrophyllite sheet in a high-density manner, which possibly originates from the electrostatic attraction effect of abundant anions on the surface of pyrophyllite to CsPbX 3 NCs. In a series of CsPbX 3 @pyrophyllite nanocomposites prepared, the PLQYs of green-emitting CsPbBr 3 and red-emitting CsPbBrI 2 were 47% and 29%, respectively. The materials were employed to fabricate white light-emitting diodes (WLEDs) with a wide color gamut of 117%. Importantly, because of the swelling and cation-adsorbent properties of pyrophyllite, the dissolution of lead in water was greatly reduced, which plays a certain role in ecological protection.
研究领域:
材料科学
·
环境科学
·
光学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zuozhu Yin,Dongpeng Zhou,Kaiyuan Liu,Min Li,Xiaoxiang Chen,Mingshan Xue,Sheng Lei,Junfei Ou,Yidan Luo,Zeming Ren
Artificial superhydrophobic coatings with mechanical stability , chemical stability, and physical stability have been achieved separately. However, achieving these properties at the same time is still a challenge. In this paper, a novel combination of sintering and spraying strategy was proposed to design a 509 reagent (1, 1, 2, 3, 3, 3-hexafluoro-2-(trifluoromethyl)propane-1-sulfonate)@Cu nanoparticles/Cu mesh/Cu organic-inorganic multilayer superhydrophobic coating. Surprisingly, the superweting coatings exhibit strong mechanical robustness undergoing cyclic tape peeling, sand/sandpaper abrasion and ultrasonic treatment. At the same time, the superhydrophobic coatings are also exposed to high temperature, UV irradiation and boiling water treatment to test its chemical stability. Moreover, the superhydrophobic coatings demonstrate outstanding physical robustness undergoing tensile force due to the combination of 509 reagent, Cu nanoparticles and Cu mesh. With multifaceted robustness, this superhydrophobic multilayer coating could be used in high-tech equipment area (such as: wear-resistance moving machine components, microfluidic devices , fluid microchips, microreactors , and so on) with strong alternating or impact loads , high friction service, and chemical corrosion.
研究领域:
材料科学
·
表面工程学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Zhang Weichuan,Liu Ziyuan,Zhang Lizhi,Wang Hui,Jiang Chuanxiu,Wu Xianxin,Li Chuanyun,Yue Shengli,Yang Rongsheng,Zhang Hong,Zhang Jianqi,Liu Xinfeng,Zhang Yuan,Zhou Huiqiong
Stability has been a long-standing concern for solution-processed perovskite photovoltaics and their practical applications. However, stable perovskite materials for photovoltaic remain insufficient to date. Here we demonstrate a series of ultrastable Dion−Jacobson (DJ) perovskites (1,4-cyclohexanedimethanammonium)(methylammonium) n −1 Pb n I 3 n +1 ( n ≥ 1) for photovoltaic applications. The scalable technology by blade-coated solar cells for the designed DJ perovskites (nominal n = 5) achieves a maximum stabilized power conversion efficiency (PCE) of 19.11% under an environmental atmosphere. Un-encapsulated cells by blade-coated technology retain 92% of their initial efficiencies for over 4000 hours under ~90% relative humidity (RH) aging conditions. More importantly, these cells also exhibit remarkable thermal (85 °C) and operational stability, which shows negligible efficiency loss after exceeding 5000-hour heat treatment or after operation at maximum power point (MPP) exceeding 6000 hours at 45 °C under a 100 mW cm −2 continuous light illumination.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Ying Zhang,Meng-Han Yan,Zhi-Fei Zhang,Hai-Rui Bai,Peng Li,Wei-Fang Han,Ji-Gong Hao,Wei Li,Yu-Chao Li,Chun-Ming Wang,Peng Fu
The increase in energy consumption and its collateral damage on the environment has encouraged the development of environment-friendly ceramic materials with good energy storage properties. In this work, (1– x )Na 0.5 Bi 0.5 TiO 3 - x Ca(Mg 1/3 Nb 2/3 )O 3 ceramics were synthesized by the solid-state reaction method. The 0.88Na 0.5 Bi 0.5 TiO 3 -0.12Ca(Mg 1/3 Nb 2/3 )O 3 ceramic exhibited a high recoverable energy storage density of 8.1 J/cm 3 and energy storage efficiency of 82.4% at 550 kV/cm. The introduction of Ca(Mg 1/3 Nb 2/3 )O 3 reduced the grain size and increased the band gap, thereby enhancing the breakdown field strength of the ceramic materials. The method also resulted in good temperature stability (20–140 °C), frequency stability (1–200 Hz), and fatigue stability over 10 6 cycles. In addition, an ultrahigh power density of 187 MW/cm 3 and a fast charge-discharge rate ( t 0.9 = 57.2 ns) can be obtained simultaneously. Finite element method analysis revealed that the decrease of grain size was beneficial to the increase of breakdown field strength. Therefore, the 0.88Na 0.5 Bi 0.5 TiO 3 -0.12Ca(Mg 1/3 Nb 2/3 )O 3 ceramics resulted in high energy storage properties with good stability and were promising environment-friendly materials for advanced pulsed power systems applications.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 24
·9301-9309
·
IF 8.067
Yizhou He,Xiaowei Guo,Huiyi Zheng,Liyifei Xv,Shaorong Li
Cs2TiBr6 has been proposed as a nontoxic, earth-abundant material. Theoretical analysis has shown that it exhibits excellent stability and photoelectric properties, providing great potential for photovoltaic (PV) applications. However, recent experiments showed controversial results on Cs2TiBr6 stability. Some claimed that Cs2TiBr6 is stable in air, while the others had the opposite result. In this work, we synthesize the Cs2TiBr6 powder by a full aqueous solution process and demonstrate that it is highly unstable in air. To reveal the decomposition mechanism, we conduct individual investigations on its oxygen, moisture, thermal, and light stability. It is found that the Cs2TiBr6 powder is highly unstable in individual oxygen and moisture environments, while it is very stable under light illumination conditions. It is noted that the Cs2TiBr6 powder decomposes into amorphous TiO2 in both individual oxygen and moisture environments, and it is accompanied by the decomposition product of (H2O)0.25·Ti4O7(OH)2 under moisture conditions. Regarding the thermal stability, the Cs2TiBr6 powder is unstable at 200 °C, but stable at 100 °C. Furthermore, the thermal and light stability of the Cs2TiBr6 film has also been verified. Our work shows that the Cs2TiBr6 film has the potential for application in detectors, solar cells, and other devices if well encapsulated.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuwei Zhao,Wei Zeng,Shengqi Su,Jingzhe Wu,Jiangnan Ke,Yonggang Sun,Xijie Lin
The commercial application of high-voltage LiCoO2 (LCO) faces significant challenges due to rapid capacity decay, primarily attributed to an unstable interface and structure at deeply delithiated states. Herein, a unique rare earth oxide composite coating comprising La2O3, Y2O3, and LaYO3 has been prepared to stabilize LCO at high voltage. The synergistic effect between these rare earth oxides significantly reinforces the protective capabilities of the coating, effectively enhancing the interfacial/structural stability of LCO. When tested at 4.6 V, the coated LCO exhibits an excellent capacity retention of 94.4% after 300 cycles at 1 C. Even after an ultralong charge/discharge test of 700 cycles at 2 C, the coated LCO retains 85.2% of its initial specific capacity, which significantly outperforms the uncoated LCO (6.3%). Moreover, the coated LCO shows enhanced cycling performance at a high temperature of 45 °C, owing to the outstanding thermal stability of the La–Y–O composite. Additionally, the superior cycling stability of the coated LCO at 4.7 V, compared to the uncoated LCO, demonstrated the promising potential of the La–Y–O composite coating in improving electrochemical performance of LCO at higher cutoff voltages. These findings highlight an efficacious strategy to enhance the interfacial/structural stability of high-voltage LCO using rare earth oxides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 4
·2678-2686
·
IF 3.84
Chunzhen Fan,Kan Li,Yalin Wang,Xufang Qian,Jinping Jia
Magnetic chitosan beads (MCBs) synthesized through a common embedding method and crosslinked with glutaraldehyde were studied for the adsorption of Cu2+ in aqueous solution. MCBs were investigated by means of hysteresis curves, thermo-magnetization curves, TGA, FTIR and XRD. Kinetic, isothermal and thermodynamic studies were applied to investigate the adsorption of Cu2+ by the MCBs. The effects of the pH value and the coexisting ions on the adsorption of Cu2+ were explored. Subsequently, the stability of the MCBs including the adsorption capacity (Qe) and the saturated magnetization (Ms) stability was investigated under various conditions. Simultaneously, FTIR and XRD were utilized to further analyze the change in the MCBs in the stability studies. The results suggested that the MCBs showed good stability without a significant loss in Qe and Ms after regeneration from five sequential cycles. The MCBs presented excellent storage stability while stored in a drying vessel for ten months. For thermal stability, the Qe and Ms of the MCBs presented similar variations after being heated in the atmosphere and in a vacuum at different temperatures for 30 h. The Qe changed slightly after being heated at 50 and 100 °C, and decreased sharply at 150 and 200 °C. The magnetization was stable in the lower temperature range (50–150 °C) and increased slightly at 200 °C. Different magnetic fields had little effect on the stability of the MCBs.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）