Materials
·
2018
·Vol. 11
·期 6
·921
·
IF 2.467
Rui Zhong,Zhao Zhang,Hongguo Zhao,Xianru He,Xin Wang,Rui Zhang
Graphene oxide (GO), modified with anti-aging agentp-phenylenediamine (PPD), was added into nitrile rubber (NBR) in order to improve the thermo-oxidative stability of NBR. The modification of GO and the transformation of functional groups were characterized by Fourier transform infrared spectroscopy (FTIR), Raman, and X-ray diffraction (XRD). Mechanical performances of NBR composites before and after the thermo-oxidative aging were recorded. The results of dynamic mechanical analysis (DMA) show an increased storage modulus (G’) and a decreased value of area of tan δ peak after introducing modified GO into NBR. It indicates that filler particles show positive interaction with molecular chains. The thermo-oxidative stability of composites was investigated by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). Then, the thermo-oxidative aging kinetic parameters were obtained by the Flynn–Wall–Ozawa (FWO) equation. The results of aging tests show that the thermo-oxidative stability of rubber matrix increases obviously after introducing GO–PPD. In addition, mechanical properties (tensile strength and elongation at break) of both before and after aged NBR/GO–PPD composites were superior to that of NBR. This work provides meaningful guidance for achieving multifunction thermo-oxidative aging resistance rubber composites.Keywords:graphene oxide (GO);p-phenylenediamine (PPD);nitrile rubber (NBR);thermo-oxidative stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
Fermentation-Basel
·
2022
·Vol. 8
·期 6
·262
·
IF 5.123
Jun Hao,Wen-Tao Sun,Chang-Rong Wu,Ming-Zhu Zhang,Guang-Hao Xia,Yu-Long Zheng,Chao Chen
Broussonetia papyriferaL. (paper mulberry) is an alternative woody plant, which can used to replace part of the protein feed for ruminants. Ensiling is an effective way to preserve fresh pasture and to solve the problem of stable storage and feed conversion of paper mulberry in the rapid growth period. However, low dry matter (DM), water-soluble carbohydrate, and lactic acid bacteria (LAB) reduce the quality of paper mulberry silage. This study assesses the influence of wilting time (0 h and 3.5 h; lighting: 3.43 × 104Lux) and three additives (Enterococcus durans, CL; cellulase, CE; and formic acid, FA) on the fermentation quality, aerobic stability, and bacterial community of whole plantB. papyriferasilage. The whole plantB. papyriferasample was mowed and wilted for 0 h and 3.5 h, and then had CL, CE, or FA added, followed by 60 days of ensiling. The results show all silage samples had high fermentation quality with pH below 4.2, ammonia-nitrogen below 100 g/kg DM, and no detectable butyric acid. The additives protected the DM and the crude protein from protease activity (p< 0.05), and CL was the most effective among them. Furthermore, wilting time influenced the silage’s bacterial communities, but overall, CL treatment had the greatest impact on bacterial communities. Wilting time and formic acid treatment significantly improved aerobic stability (p< 0.05).Enterococcuswas positively correlated with lactic acid (LA), while negatively correlated with LA andWeissella(p< 0.001). Enterococcuswas identified as the main driver of the whole plant paper mulberry ensiling process in the present study. In conclusion, compared to other additives, LAB is the most effective and economical to improve the fermentation quality and reduce the protein degradation of whole plant paper mulberry silage. Our findings provide a theoretical basis to improve the quality and production of paper mulberry silage.Keywords:paper mulberry;silage;wilting;additives;microbial community;aerobic stability
研究领域:
动物营养学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2022
·
IF 6.064
Li Xiaomei,Chen Fei,Xiong Yi,Guo Linna,Xu Jingjing,Lin Yanli,Ni Kuikui,Yang Fuyu
The aim of this study was to investigate the influence of Perilla frutescens, alone or in combination with Lactobacillus plantarum a214 or citric acid, on forage oat silage quality, bacterial and fungal microbiological profile during ensiling and aerobic exposure. With the exception of Perilla frutescens, all additives could improve silage quality of forage oat based on lower ammonia-nitrogen content and higher residual of water soluble carbohydrates during anaerobic fermentation compared to control silage, especially in Perilla frutescens combined with citric acid (CAPF). Lactobacillus was the dominant bacteria in all silages, while CAPF group increased the relative abundance of Lactobacillus lindneri and Lactobacillus brevis compared to control silage. The application of Perilla frutescens suppressed the relative abundance of yeasts such as Pichia fermentans and Wickerhamomyces anomalus in response to aerobic exposure, especially in CAPF treatment, leading to high acetic acids and lower dry matter loss, as well as good aerobic stability. Therefore, Perilla frutescens, alone or in combination with citric acid, has potential to improve aerobic stability of forage oat silage by shifting bacterial and fungal community composition, and can be used as new additive to prepare high-quality silage for animal production.
研究领域:
微生物学
·
动物营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2021
·Vol. 130
·期 5
·1456-1465
·
IF 3.772
Zhao J.,Tao X.,Wang S.,Li J.,Shao T.
AimsThis study aimed to evaluate the feasibility of sorbic acid (SA) as a silage additive and its effects on fermentation quality and aerobic stability of high dry matter (DM) silage.Methods and ResultsHigh DM rice straw was ensiled with distilled water (C), 1 × 106 CFU per gram fresh weight (FW) Lactobacillus plantarum and 1 × 106 CFU per gram FW Lactobacillus buchneri (LP+LB) or SA for 45 days with a subsequent aerobic stability test. After ensiling, LP+LB silage had the highest lactic acid (LA) content and the lowest pH value, whereas SA silage had the highest DM and water‐soluble carbohydrate (WSC) contents, and the lowest ethanol and ammonia nitrogen (NH3‐N) contents among all silages (P < 0·001). Compared to C silage, SA significantly (P < 0·01) reduced the counts of yeasts but not lactic acid bacteria (LAB). During 6‐day aerobic exposure, the continuous pH increase and LA decrease were observed in C and LP+LB silages, and there was no significant change in pH, DM, NH3‐N and WSC contents of SA silage over the whole aerobic exposure. The SA addition slowed the decline of LA and acetic acid (AA) contents as well as the growth of yeasts and aerobic bacteria under aerobic exposure.ConclusionIn this study, L. buchneri could not function in high DM rice straw silage while SA effectively improved both the fermentation quality and aerobic stability.Significance and Impact of the StudyThe SA was more effective than dual‐purpose inoculants to improve the aerobic stability of high DM rice straw silage. Thus, SA can be served as a potential antifungal additive for silage with high DM.
研究领域:
动物科学
·
微生物学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 2
·480-487
·
IF 8.067
Xiaoyu Liu,Qin He,Jiageng Pan,Hui Liang,Noreen Rehmat,Liang Gao,Yanping Huo,Shaomin Ji
Effective triplet–triplet annihilation photon upconversion (TTA-UC) is usually difficult to achieve under aerobic conditions, but is highly desirable for practical applications in which durability is greatly needed to sustain environmental loads and expand the lifespan of the relevant devices. Here, we developed a novel upcoversion organogel with platinum octaethylporphyrin (PtOEP) as sensitizer, 9,10-diphenylanthracene (DPA) as acceptor and n-octanal-modified polyvinyl alcohol (PVA) as structural matrix. The acquired organogel demonstrated self-healing ability and malleability. The exquisite combination of these components affords a variety of features, such as high oxygen resistance, high transparency, strong mechanics, and malleability, benefitting from the dynamic features of the noncovalently crosslinked network and highly compact morphology as well as the enhanced contact probability of the chromophores. The organogel shows effective green-to-blue upconversion, with a quantum yield ΦUC of up to 6.7% in the aerobic environment. The upconversion efficiency of the organogel can maintain over 67% of its original value after long-term sealed storage (>180 days). This research provides a simple and effective strategy for the development of high-efficiency upconversion solid carrier materials.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Liuyang Zhao,Zian Huang,Shenao Ma,Hongfu Tang,Ruixue Tian,Hao Huang,Aimin Wu,Aikui Li,Guozhong Cao
The exceptional capacity of lithium-rich manganese-based oxides (LRMO) primarily originates from the reversible oxygen redox process. Nevertheless, long-term cycling inevitably induces lattice oxygen instability, which remains a critical challenge for the practical application of LRMO. Doping with the oxygen-affinity element silicon (Si) has been identified as a promising strategy for stabilizing lattice oxygen due to the strong Si-O covalent bonds and small ionic radii. The incorporation of robust Si-O covalent bonds and the negative charge on oxygen atoms induced reduction of transition metal slabs intralayer and expansion of transition metal slabs interlayer, thereby fixing lattice oxygen and facilitating the transport of lithium ions in the Li 1.2 Mn 0.53 Co 0.13 Ni 0.13 Si 0.01 O 2 cathode material. Theoretical calculations further demonstrate that the Si substitution strategy substantially increases the formation energy of oxygen vacancies and effectively minimizes lattice oxygen loss under high-voltage conditions (≥ 4.8 V). These findings elucidate the critical role of oxygen-affinity elements with small ionic radii in regulating intralayer/interlayer spatial variations, thereby stabilizing lattice oxygen in high-energy–density electrode materials.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Chen Hou,Yi-Ran Xing,Le-Le Yu,Yong-Heng Si,Han Lu,Yu-Juan Zhao
Fe–Mn based Li-rich cathode materials are regarded as one of the most promising cathode materials for their low cost and high energy density but possess drawbacks such as high oxygen release, low conductivity, and slow kinetics for lithium-ion transport. To address these issues, herein, we proposed a high-valance cations Nb 5+ doping strategy and synthesized a series of Li 1.26 [Fe 0.22 Mn 0.52 ] 1−x Nb 0.74x O 2 ( x = 0, 0.02, 0.03, 0.04) cathode materials. Using a combination of experimental approaches and density functional theory (DFT) calculations, we found that the doped samples presented expanded interlayer spacing for Li-ion migration and better structural stability due to the large ionic radius of Nb 5+ and the strengthened Nb–O bond. Moreover, Nb doping could not only decrease the band gap and the density of states of the O 2p band but also contribute extra electrons to surrounding O atoms, thereby enhancing electronic conductivity and stabilizing lattice oxygen. Benefit from the underlying mechanisms mentioned above, the Nb 0.022 sample possessed a higher Coulombic efficiency (71.1 vs 65.0%) at 0.2 C, showing more stable cycling performance (90.4 vs 67.7 mAh g −1 ) at 0.5 C and rate capability. These favorable results can assist in the development of Fe–Mn based Li-rich cathode materials with excellent electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Muyao Gao,Tianhao Li,Wenjing Kong,Xun Sun,Li Liu,Bing Li,Yujie Song,Ming Liu
Phthalonitrile resins are one of the high temperature resistant polymers which can be potentially used for harsh environments in both military and domestic fields. The high melting points of the monomers led to short processing windows and made processing procedure challenging and energy intensive. To solve this problem, liquid phthalonitrile monomers containing flexible siloxane segments were designed and synthesized. The long bond length and large bond angle of Si-O-Si chain segments introduced flexibility into the monomers and effectively reduced the melting point to −35.9 °C. Meanwhile, the high bond energy preserved the thermal stability of the resulting cured resin. The high fluidity (viscosity of ∼ 2 Pa·s at 30 °C) allows the monomers to be processed at room temperature without additional heating. In addition, the monomers can be dissolved in common organic solvents, such as ethyl acetate and ethanol. The resins cured at 250 °C demonstrated good thermal and thermal oxygen stability. The weight loss of 5 % in argon and air at temperatures of 428.6 °C and 434.9 °C, respectively. Furthermore, blending this liquid monomer blended with powdered monomers improved both the processibility of the high melting monomers and the overall temperature resistance of the cured resin. The resin showed a weight loss of 5 % in argon and air of 534.4 °C and 532.3 °C, respectively.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL SCIENCE
·
2024
·Vol. 161
·期 6
·877-886
·
IF 1.7
Xinbao Li,Haopeng Liu,Tongtong Dai,Dong Dong,Guofeng Xu,Yushan Jia,Tao Shao
The work aimed to evaluate the effect of lactic acid bacteria, natamycin and hexanoic acid on the fermentation quality, aerobic stability and in vitro digestibility of total mixed ration (TMR) silages containing water bamboo sheath leaves. The treatments were as follows: (1) no additives (control, C), (2) lactic acid bacteria (L), (3) natamycin (N), (4) hexanoic acid (H), (5) lactic acid bacteria + natamycin (LN), (6) lactic acid bacteria + hexanoic acid (LH). Silos were opened and silages were evaluated to assess fermentation quality, aerobic stability and in vitro digestibility. All TMR silages were well-preserved as indicated by dominant lactic acid content, low ammonia nitrogen/total nitrogen, trace propionic acid and negligible butyric acid contents. All additives improved the fermentation quality and in vitro digestibility, evidenced by higher lactic acid/acetic acid ratio, lactic acid, acetic acid, water-soluble carbohydrate contents and lactic acid bacteria count, and lower pH, aerobic bacteria and yeast counts. The LN had the highest lactic acid, acetic acid, lactic acid/acetic acid ratio, in vitro gas production and in vitro digestibility. During aerobic exposure, the LN silage had the highest lactic acid and acetic acid contents, and the lowest pH among all TMR silages. The LN and LH prolonged aerobic stability, reaching 85.5 and 81.5 h, respectively. The LN is recommended to improve the fermentation quality, aerobic stability and in vitro digestibility of TMR prepared with water bamboo sheath leaves.
研究领域:
动物营养学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 6
·3682-3688
·
IF 10.7
Hujun Zhang,Li Qin,Michal Sedlacik,Petr Saha,Qilin Cheng,Haifeng Yu,Hao Jiang
Single-crystalline nickel-rich cobalt-poor layered oxides are promising cathode materials for lithium-ion batteries due to their high safety and competitive cost. However, the severe cation disorder and lithium/oxygen (Li/O) loss during the high-temperature calcination process result in slow Li-ion diffusion and inferior O stability. Herein, a LiNi0.85Co0.05Mn0.10O2 (NCM85) single-crystalline cathode was prepared at relatively lower lithiation temperatures by barium/aluminum (Ba/Al) co-doping. The increase in the c-axis caused by Ba doping with a larger ion radius and the reduction in Li/Ni disorder can enhance the Li-ion diffusion kinetics, while the strong Ba–O and Al–O bonds considerably boost the lattice O stability to alleviate O escape during the charging process. The optimized cathode exhibits a high reversible capacity of 206.5 mA h g−1 at 0.1C and 115.6 mA h g−1 at 5C. Impressively, 87.5% of initial capacity is still maintained after 500 cycles at 1C in a pouch-type full cell. This finding provides a viable and flexible method to resolve the kinetics and stability issues of other layered oxide cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 11
·2104841
·
IF 17.521
Shulan Mao,Zeyu Shen,Weidong Zhang,Qian Wu,Zhuoya Wang,Yingying Lu
The energy density of batteries with lithium cobalt oxide (LCO) can be maximized by increasing the cut-off voltage to approach the theoretical capacity limit. However, it is not realized in the practical applications due to the restricted cycle life caused by vulnerable cathode surface in deep delithiation state, where severe side reactions, oxygen/cobalt loss and structure degradation often happen. Here, an outside-in oriented nanostructure on LiCoO 2 crystals is fabricated. The outer electrochemically stable LiF and Li 2 CoTi 3 O 8 particles perform as physical barrier to prevent damage of both cathodes and electrolytes, while the inner F doping promote Li ions diffusivity and stabilize the lattice oxygen. With the spinel-like transition layer between them, a solid and complete lithium-ion transport channel generation along the lithium concentration gradient. Under the protection from this structure, the LiCoO 2 withstand the high voltage of 4.6 V and the LCO/graphite pouch full cell with high loading density exhibits 81.52% energy density retention after 135 cycles at 4.5 V.
研究领域:
材料科学
·
储能
·
电化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Zhichao Wang,Yajun Shi,Fei Luan,Dongyan Guo,XiaoFei Zhang,Bingtao Zhai,Liang Feng,Junbo Zou
Essential oils, key active components in traditional Chinese medicine (TCM) with broad pharmacological activities, are prone to oxidation and degradation during storage and use, limiting their clinical application. This study, guided by the concept of "combination of medicine and adjuvant", uses PEG 20,000 modified artificial bezoar (MAB) as a Pickering emulsion stabilizer to encapsulate Acorus tatarinowii essential oil (ATEO). The MAB shows increased contact angle and remarkable changes in surface morphology and chemical structure. Single-factor experiments optimize the emulsion preparation conditions: MAB concentration at 15 mg/mL, oil phase volume fraction at 60 %, shear rate at 12,000 rpm, and shear time at 2 min. The resulting Pickering emulsion is of O/W type, with a particle size of 1300 nm and a zeta potential of 32.50 mV, exhibiting good stability. Ozone stability tests reveal that the Pickering emulsion effectively reduces the peroxide value (POV) and malondialdehyde value (MDA) of ATEO, curbing the oxidative degradation of its major components. In vitro and in vivo release behavior studies show that the Pickering emulsion encapsulated ATEO exhibits different regulatory effects on α- and β-asarone. Overall, this study offers a novel and effective strategy for enhancing the oxidative stability of essential oils in TCM.
研究领域:
药剂学
·
中医药学
·
食品科学
·
材料科学
·
药理学
✓ 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）