JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2020
·Vol. 97
·期 6
·603-614
·
IF 1.659
Jia Luo,Zeping Wang,Shangzhi Deng,Fan Zhang,Guirong Bao,Junni Mao,Wenjing Yang
Direct glycerolysis of novel edible Sacha Inchi ( Plukenetia volubilis L.) seed oil (PvLO) into diacylglycerols (DAG) and monoacylglycerols (MAG) was studied over solid Na 2 SiO 3 with or without microwave assistance. The glycerolysis yield was calculated by qualitative and semiquantitative analyses of 1 H NMR, 13 C NMR, and FT-IR spectra. The yields of ~33% 1, 3-DAG, ~16% 1, 2-DAG, ~40% 1-MAG, and ~2.3% 2-MAG were achieved after 16 hours at 120 °C in three consecutive cycles using acetone, with an interesterification rate of 92%. The modified oil showed enhanced gelation ability at low temperatures. The yield of 1, 2-DAG can be increased by adding acetone as solvent. The fatty acid compositions and unsaturated structure of lipids were less destroyed after alkaline glycerolysis. However, more α-linolenic and linoleic acids were transferred to the sn -2 position of glyceryl skeleton. The oxidative stability of the modified oil was still controllable. In summary, this work provides a feasible method to convert polyunsaturated plant oils into oils rich in DAG and MAG with less destructive impact on the olefinic structure of oil. Also, it provides a useful example of how to quickly evaluate the influence of chemical modification on the chemical structure of plant oils by using various spectral technologies.
研究领域:
食品科学
·
化学工程
·
植物油脂加工
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2015
·
IF 3.52
Fan Zhang,Zhen Fang,Yi-Tong Wang
Magnetic heterogeneous catalyst (Na 2 SiO 3 @Fe 3 O 4 /C) was prepared for the production of biodiesel from oils with high acid value (AV) under ultrasonic (US) irradiation and magnetic stirring (MS). With the catalyst and assisted by US, soybean biodiesel yield reached >90% in only 20 min (or at 318 K) and 97.9% under the optimal conditions. It was easily magnetically separated for 5 cycles with 94.9% recovery rate and biodiesel yield >80% with both US and MS. The catalyst transesterified Jatropha oil with biodiesel yields of 94.7%, 93.2% and 83.5% at AV of 1.3, 4.8 and 7.3 (mg KOH/g) with US, and was cycled 5 times with yield >70% at AV of 4.8 assisted by US and MS. High biodiesel yield (90.7%) was still achieved from high AV oil (4.8) at low US energy density (0.1 W/mL) and MS. The catalyst combined with US and MS can find practical application for direct production of biodiesel from oils with high AV.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
A novel Na2SiO3/Fenton system was employed for NO removal from coal-fired flue gas in a bubble reactor. The NO removal efficiency of this system could reach 94.36% when the flue gas residence time was 3 s. The hydrolysis reaction of Na2SiO3 produced OH-, which made the solution alkaline, and the formation of iron-based colloids in the alkaline environment effectively catalyzed the generation of free radicals from H2O2, O2•– radicals, which was the main reason for the increase of NO removal efficiency. The reaction of H2O2 catalyzed by iron-based colloids increased the solution pH, which could not only further improve the NO removal efficiency but also enhance the useless decomposition of H2O2. Na2SiO3 could buffer the solution pH, which weakened the ineffective decomposition of H2O2 and prolonged the effective denitrification time. The X-ray diffraction and ion chromatography analysis showed that NO was finally converted to NO3– and NO2–.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ran Ao,Jinyan Liu,Xiaohui Ren,Yuelong Liu,Yan Jia
In this paper, corrosion inhibition performance of Helianthus tuberosus L extracts(HTLE) and Poria cocos extracts(PCSE) alone and compounded with Na 2 SiO 3 in 0.01 mol L −1 NaOH solution on AA2024-T3 aluminum alloy was investigated by weight loss, electrochemical impedance spectroscopy, potential polarization, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS), quantum chemical calculations and molecular dynamics simulations. Infrared spectroscopy was used to study the main active components in both extracts. The results revealed that when the two extracts were utilized separately, the corrosion inhibition impact was insignificant. However, when compounded with Na 2 SiO 3 , the corrosion inhibition efficiency was greatly enhanced. Fixing the concentration of Na 2 SiO 3 at 610 mg L −1 , the inhibition effectiveness rose with the increase of the concentration of the extracts, and when the concentration of HTLE, PCSE were 800 mg L −1 and 1000 mg L −1 , respectively, the inhibition efficiencies could reached approximated 98 %. The two compounds were anodic-dominant hybrid corrosion inhibitors. AFM and XPS analysis revealed that the two compounds could successfully adsorb on the aluminum alloy surface, protecting the metal from corrosion. Theoretical simulations were conducted by selecting the three major components from each of the two extracts. Quantitative chemistry calculations indicated the accepted and donated electron groups of the major components. Molecular dynamics simulations show that the primary components compounded with Na 2 SiO 3 have a higher negative adsorption energy than their action alone.
研究领域:
材料科学
·
电化学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2020
·
IF 4.632
Chang Ma,Yahui Mo,Lei Liu,Yifeng Yu,Aibing Chen
Metal organic frameworks (MOFs) derived carbonaceous materials have a wide range of applications in the fields of energy storage, catalysis, adsorption and separation, etc . Especially, zeolitic imidazolate framework-8 (ZIF-8) is an excellent candidate to synthesize porous carbon due to the large surface area and high nitrogen content. However, the dominated microporous structure of ZIF-8-derived carbon significantly hinders ionic mass transfer, limiting the improvement of performance. Herein, MOF-derived mesoporous carbon was prepared using ZIF-8 as carbon precursor and cheap sodium silicate (Na 2 SiO 3 ) as activator. The introduction of Na 2 SiO 3 created rich mesoporous structure and increased specific surface area, as well as the effects of pyrolysis temperature and Na 2 SiO 3 dosage on performance was also investigated. The obtained ZIF-derived porous carbon exhibits good electrochemical performance with specific capacitance of 263 F/g at 1 A/g and excellent cycle life (96.07% after 10,000 GCD cycles) in supercapacitor. The use of cheap Na 2 SiO 3 activator provides a new orientation for the preparation of MOF-derived carbons with rich pores, high surface area, and facilitates the large-scale application of MOF-derived carbons.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 5
·578
·
IF 3.236
Su Pan,Xiaohua Tu,Jianxing Yu,Yang Zhang,Chengping Miao,Yaling Xu,Rui Fu,Jiayou Li
The optimization of NaOH-Na2SiO3-Na2B4O7electrolyte for the plasma electrolytic oxidation of AZ31B magnesium alloy was investigated through orthogonal tests. The properties of the anodized films were evaluated by film thickness, roughness measurements, salt spray tests, scanning electron microscopy (SEM), X-ray diffraction (XRD) and potentiodynamic polarization tests, respectively. The orthogonal tests revealed that the optimal formulation of the electrolyte comprised NaOH 45 g/L, Na2SiO350 g/L, and Na2B4O790 g/L. NaOH exhibited the most significant effect on film thickness, while Na2SiO3had the greatest effect on corrosion resistance. Moreover, the optimal electrical parameters were also obtained with the values of current density 1 A /dm2, oxidation time 15 min, pulse frequency 200 Hz and duty cycle of 10%. The surface morphology of the anodized coating formed under optimal conditions was uniform and compact. Furthermore, the phase compositions of all samples were mainly composed of MgO and Mg2SiO4. The corrosion potential, corrosion current density and polarization resistance of the prepared coating by plasma electrolytic oxidation improved remarkably compared with that of the substrate.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·123007
·
IF 2.142
Guodong Zhang,Jiaqi Chen,Yao Liu
Iron-based soft magnetic composites (SMCs) were prepared by two-step ball milling with sodium silicate and ferroferric oxide. The presence of the precoated silicate layer has increased the resistivity of the powder surface, which also improved the agglomeration of ferroferric oxide. The addition of magnetic ferroferric oxide improves the dilution effect. Combining the advantages of both sodium silicate and ferroferric oxide, the prepared soft magnetic composite material has excellent performance. After annealing at 400 °C, the core loss is 214.5 W Kg−1 (1 T, 1000 Hz), and the saturation magnetic induction is 1.33 T.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Bin Yang,Ziqiang Yang,Xueqian Zhang,Ya Zhao,Youyu Wang,Jiahao Chen,Sen Wang,Qing Zhao,Zhiguo Hou
Sodium metal battery is considered as one of the most promising energy storage/conversion devices due to their high energy density, and abundant sodium reserves. However, its development is hampered by the limited metallic utilization and detrimental sodium dendrite growth ascribed to the unstable, and fragile solid electrolyte interphase (SEI). Here, the high stable and modulus SEI is constructed with a component of a thin and dense layer of high Na-ion conductive Na 2 SiO 3 . It is in situ formed by the reaction between sodium anode and fish-skin structure separator, which exhibits a 3D porous polyvinylidene fluoride-based framework embedded with thin and robust vermiculite sheets. The robust interphase cannot only suppress sodium dendrite growth but also enable high energy density with small interphase-consumed Na ions in anode-less batteries. Accordingly, the as-assembled NaNi 1/3 Fe 1/3 Mn 1/3 O 2 //Na cell shows 83% capacity retention after 5000 cycles at a rate of 5 °C. Moreover, the proof-of-concept pouch cells deliver an energy density of 205 Wh kg −1 (based on the total mass of the battery), and high safety (not catching fire after punctured) under anode-less condition (with a low negative/positive capacity ratio of ≈2.1).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Zengmou Li,Xiaoling Liu,Qianwen Wang,Xinyu Jiang,Rui Yan,Keyu Zhang,Yaochun Yao,Shaoze Zhang,Yin Li,Junxian Hu
Serious volume expansion for silicon-based material has extremely restricted its widespread application. Herein, Si@Na 2 SiO 3 composite with grape-liked structure was fabricated by a simple metal salt-assisted chemical etching method, which is enabled by the high corrosivity of NaHCO 3 . The gelatinous Na 2 SiO 3 can evenly coat the surface of Si nanoparticles, then efficiently inhibiting volume expansion. Meanwhile, porous structures etched by NaHCO 3 provide more diffusion channels for Li + . Si@Na 2 SiO 3 exhibits excellent cycling and rate properties: the discharge capacity of 1140.16mAh g −1 at 0.5 A g -1 after 100th cycling and the stable discharge capacity of 1565.64 mAh g −1 at 2.0 A g −1 . This research provides a simple and effective technology to exploit the high-capacity silicon-based anode material.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 19
·2400443
·
IF 6
Shuyue Xue,Sheng Yang,Yukai Liu,Jinzhan Su
CsPbIBr 2 has garnered significant interest due to its ideal bandgap and good stability. However, defects formed at the interface between the electron transport layer and the perovskite can lead to increased non-radiative recombination, which negatively impacts both the power conversion efficiency (PCE) of perovskite solar cells and the long-term stability of the cells. Herein, the TiO 2 /perovskite interface is modified by adding sodium silicate to passivate the defects on the interface. The introduction of Na + partially reduces Ti 4+ to Ti 3+ in TiO 2 , thereby passivating trap states caused by oxygen vacancy defects and adjusting the energy level alignment between TiO 2 and the perovskite film, enhancing the carrier transport efficiency. Additionally, SiO 3 2− can form Si O Pb (and Cs) bonds with the undercoordinated Pb 2+ and Cs + on the surface of the perovskite layer, effectively passivating surface defects of the perovskite film and thereby improving the efficiency of the devices. Ultimately, the carbon-based all-inorganic CsPbIBr 2 perovskite solar cells treated with Na 2 SiO 3 exhibit a significantly improved PCE of 10.85% compared to 8.62% of the control sample and achieve a high open-circuit voltage of 1.31 V. With this modification, the devices also demonstrate reduced hysteresis effects and enhanced stability.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhangchao Mo,Xuesong Jiang,Xiaoxiao Zhu,Juxuan Ding,Boyuan Ban,Jifei Sun,Jian Chen
Glass fiber powder contains two distinct forms: crumb-shaped and rod-shaped glass fiber powder particles. The shape and size of the particles in glass fiber powder have a great influence on its application. In order to separate rod-shaped glass fiber, the effects of different dispersants, such as SHMP, NaOL, and Na 2 SiO 3 on them were investigated by settling experiments. Zeta potential, X-ray photoelectron spectroscopy (XPS), optical microscope, and other methods were used to analyze the adsorption behavior and settling mechanism. Three-point bending experiment and dynamic mechanical analysis (DMA) were used to evaluate the performance of epoxy resin composites reinforced with the raw glass fiber powder and the rod-shaped glass fiber powder. The results show that SHMP can effectively separate crumb-shaped glass fiber powder and rod-shaped glass fiber powder, leading to a notable increase in sedimentation recovery difference, up to Δ=51.08 %. A preferential sedimentation separation mechanism is proposed to elucidate the settling mechanism. When the content of glass fiber powder and rod-shaped glass fiber is 5 %, the glass transition temperature shifts significantly towards higher values, leading to the optimum comprehensive mechanical properties of the composites. Compared with the original epoxy resin, the flexural strength increased by 10.38 % to 95.18 MPa and by 20.11 % to 103.57 MPa. Similarly, the storage modulus increased by 14.14 % to 2083 MPa and by 21.64 % to 2220 MPa.
研究领域:
材料科学
·
复合材料
·
高分子科学
·
机械工程
✓ 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）