INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhaojie Yang,Minghua Zhang,Zhixin Zhao,Wenting Lan,Xi Zhang,Minmin Fan
To avoid the detrimental effect of aryl ethers on the alkali stability of anion exchange membrane (AEM), elaborately designed and synthesized poly(styrene- co -4-vinyl pyridine) (PS4VP) copolymer without aryl ether linkages is used to prepare AEMs. By introducing commercialized polyquaternium-10 (PQ-10) as the main ion-conducting molecule, the fully-interpenetrating polymer network quaternized PS4VP/PQ-10 (F-IPN QPS4VP/PQ-10) AEMs are prepared by cross-linking PS4VP and PQ-10, respectively. The as-prepared F-IPN QPS4VP/PQ-10 AEMs have obvious nanoscale microphase-separated morphologies, which ensure the membranes have good mechanical properties and dimensional stability. With optimized component ratios, F-IPN QPS4VP/PQ-10 AEM exhibits high ionic conductivity (74.29 mS/cm at 80 °C) and power density (111.83 mW/cm 2 at 60 °C), as well as excellent chemical stabilities (94.36% retaining of initial mass after immersion in Fenton reagent at 30 °C for 10 days, and 92.28% retaining of original ionic conductivity after immersion in 1 M NaOH solution at 60 °C for 30 days), which are greater than those of semi-interpenetrating polymer network QPS4VP/PQ-10 AEM. In summary, a combination of fully-interpenetrating polymer network and stable polymer chains and ion-conducting moieties is found to effectively overcome the trade-off between high ionic conductivity and good dimensional/chemical stabilities.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Shao-Bo Cao,Lin-Yu Zhou,Guolei Xiang,Guang-Wen Chu,Liang-Liang Zhang,Jian-Feng Chen
Sub-10 nm Co 3 O 4 nanoparticles with a narrow size distribution are prepared by a surfactant-free liquid precipitation method in a rotating packed bed (RPB) reactor. The mean size of the material is about 8.5 nm, and is the smallest among previous reports via surfactant-free liquid precipitation. The growth mechanisms show that the sizes of Co 3 O 4 nanoparticles inherit from the precursory Co(OH) 2 . Compared to the traditional stirred tank reactor, RPB can enhance the nucleation of Co(OH) 2 through enhanced micro-mixing, which leads to thinner and more uniform products. As-prepared Co 3 O 4 can show enhanced catalytic performance for ammonium perchlorate (AP) decomposition. The peak temperatures of AP decomposition reduce to 296.8 °C, 291.8 °C, 290.0 °C, and 286.6 °C by adding 2 wt% 22.6 nm, 15.0 nm, 10.9 nm, and 8.5 nm of Co 3 O 4 nanoparticles, respectively. Density functional theory (DFT) calculations and thermogravimetry coupled with mass spectrometry (TG-MS) analysis reveal that the size-dependent catalytic activity of Co 3 O 4 for AP decomposition origin from varied O 2 activation ability and NH 3 adsorption capacity at the edge and corner sites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Jian Yang,Jiangtao Wu,Shengshan Bi
As the main components of synthetic hydrocarbons obtained using gas to liquid conversion technologies, long-chain alkanes and alcohols play an important role in the Fischer–Tropsch process. So the reliable surface tension data of these fluids are significant for the understanding and eventual improvement of synthesis efficiency. In the present study, a new high temperature and high pressure pendant drop apparatus was developed and tested with n-heptane at temperatures from (303.15 to 473.15) K, and a good agreement between the experimental data and the literature data could be found. With the new apparatus, the experimental surface tension measurements of n-dodecane, n-hexadecane, 2,2,4,4,6,8,8-heptamethylnonane, n-octacosane, squalane, 1-dodecanol, 1,12-dodecandiol, 2-butyl-1-octanol, 1-hexadecanol and 2-hexyl-1-decanol were performed under saturation conditions over the temperature range from 303.15 K (348.15 K for n-octacosane and 1-hexadecanol, 373.15 K for 1,12-dodecandiol) to 573.15 K. The combined expanded uncertainties of temperature and surface tension with a level of confidence of 0.95 (k = 2) are estimated to be 20 mK and less than 1.5% over the entire temperature, respectively. Furthermore, the surface tension data were correlated with the modified van der Waals equation, and the average absolute deviations are within 0.65%. On the basis of the correlations, the comparisons of our experimental data with the available literature data were discussed, and the satisfactory agreement revealed that the experimental results of this work were reliable and reasonable.
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 31
·20843-20853
·
IF 3.3
Anhua Wei,Jingfang OuYang,Yuyang Guo,Suju Jiang,Feifei Chen,Jun Huang,Qi Xiao,Zihua Wu
Gold nanorods have been widely used in various fields due to their tunable anisotropic localized surface plasmon resonance (SPR) property. The facile preparation of gold nanorods with a tunable SPR wavelength extending to a near-infrared window, and at the same time, a relatively small particle size for facilitating applications especially in the biomedical field is of great value yet highly challenging. In this work, a new reducing agent, 1,6-dihydroxynaphthalene, is proposed for the synthesis of gold nanorods. The results indicate that gold nanorods with good monodispersity, high shape yield, maximum SPR wavelength of 1200 nm, and especially small diameter of around 10 nm can be acquired simultaneously. In terms of spectral and size controls, by respectively varying the experimental parameters including the amount of silver ions, reducing agents, and gold seeds not only can a good linear correlation be acquired corresponding to a SPR wavelength ranging from around 600 nm to 1200 nm, but a regular change in the particle diameter from 10.5 nm to 7.5 nm could also be observed. The structural and morphological evolutions of the particle for each changed parameter were carefully studied, and insights were gained into the growth mechanism based on the detailed analysis of particle evolution at a specific stage of the growth process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jie Chen,Guangxing Yang,Dongyan Shen,Qiao Zhang,Zhiting Liu,Feng Peng
Size effect of Pt nanoparticle (NPs) on electrocatalysis should be investigated in a wide size range and a narrow distribution. The surfactants used for size control were detrimental to exploring size effect. However, the largest size of Pt colloidal NPs was limited to ∼5 nm without surfactant, which is insufficient for investigating size effect. In this work, surfactant-free Pt colloidal NPs with a wider size range from 1.8 to 10.0 nm were synthesized by controlling the ratio of NaOH and Pt salts in the ethylene glycol by oil-bath heating. Assisted by the precise control of Pt size, the size effect on the electrooxidation of CO, methanol and ethanol was studied, showing that the optimal size varied from the specific catalytic reaction . The synthesis extended the upper limit of large Pt NPs by surfactant-free method, showing potentials in preparing other precious metal NPs with a wide size range.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 17
·2300367
·
IF 6.8
Yongxing Lin,Pengfei Qi,Jincheng Liu,Yizhi Zhuo,Cheng Cai,Haibao Zhang,Xiangyang Li,Xianglan Liu,Lin Chen,Sihai Luo,Xingyou Tian
Large-area gold-coated polyamide 66 (PA66) nanopillar (PA66NP@Au) arrays consisting of secondary lamellar structures and sub-10–nm gaps are fabricated for surface-enhanced Raman spectroscopy (SERS) using ultrathin anodized aluminum oxide (AAO) template, solution-phase growth of PA66 lamellae, and Au sputtering. Such closely packed PA66NP@Au arrays with high density of electromagnetic field enhancement (“hot spots”) on large area exhibit high SERS sensitivity for detection of rhodamine 6g (R6G) molecules with concentration down to 10 −14 m and a large Raman analytical enhancement factor (AEF) of ≈10 10 . Furthermore, the as-fabricated PA66NP@Au arrays provide highly sensitive Raman signals in detection of a commonly pesticide residue, carbendazim with a limit of detection (LOD) of 0.05 mg L −1 (0.05 ppm), which is lower than that of maximum residue limit of 0.2 ppm allowed in Europe Union. The as-fabricated PA66NP@Au arrays are promising for highly sensitive and uniform SERS detection.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5287-5295
·
IF 2.289
Zhang Anping,Shi Hongxia,Liu Weiqi,Wang Xiaojun,Zhou Yiming,Wu Ping
Tin-based alloys have been regarded as promising anodes to replace commercial carbon materials for Li-ion batteries, but their Li-storage performance, especially cycle life, still fails to meet the requirements for electric vehicles and large-scale electricity storages. Herein, we propose a facile and scalable hydrogel-derived route for uniformly immobilizing sub-10 nm Sn-based alloys within three-dimensional (3D) carbon nanocorals, using polymer-hybridized cyano-bridged coordination polymer hydrogels (cyanogels) as precursors. As a representative example, 3D Sn–Fe@C nanocorals have been constructed through freeze-drying and thermal-autoreduction processes using polyethylene glycol (PEG) hybridized Sn(IV)–Fe(II) cyanogels as precursors. PEG plays critical roles in structural tailoring of hybrid cyanogels and size control of Sn–Fe alloys, and as a result, the average alloy size in optimized Sn–Fe@C nanocoral is only 5.9 nm. The ultrasmall alloy size, uniform dispersity of alloy, as well as coral-like framework structure, enable the Sn–Fe@C nanocorals to exhibit long-term cyclic life and high-rate performance.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2017
·
IF 3.531
Shuangbao Peng,Zhiyang Bu,Linbo Wu,Bo-Geng Li,Philippe Dubois
In this study, high molecular weight poly(butylene succinate-co-furandicarboxylate) with 10 mol% of butylene furandicarboxylate unit (PBSF10) was synthesized and its crystal structure and crystallization-melting behaviors were investigated by means of WAXD, SAXS, DSC and POM. The tensile properties were also assessed. The crystal structure of PBSF10 is found to be the same as that of poly(butylene succinate) (PBS). The SAXS result indicates that PBSF10 had the same thicknesses of crystalline region and transition zone, but larger thickness of amorphous region, indicating that the BF units are mostly excluded from the crystalline region and located in the amorphous region. Therefore, PBSF10 is less crystallizable than PBS. But PBSF10 still exhibits rapid nonisothermal and isothermal crystallization. Because of high molecular weight and good crystallizability, PBSF10 exhibits superior tensile properties: modulus 370 MPa, strength at break 38 MPa and elongation at break 230%.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yunpeng Zong,Yong Liu,Wenxia Zhao,Hao Zhang,Baojun Li,Xiang Zhou,Hui Shen
Herein, we report a simple base-free hydrothermal route for the synthesis of mesoporous TiO 2 fibers by using chitosan as direct agent. This hierarchical structure combines advantages of mesopores constructed by interconnected sub-10 nm nanocrystals on nanoscale and 1D structure with large aspect ratio on micron-scale, which is desired structural characteristic needed for the high-performance anode materials. Benefiting from such unique structural features, it demonstrates superior high charge/discharge capability, good cycling stability and rate capability when used as lithium-ion batteries electrode. For example, it can deliver a capacity of 174 mA h g −1 at 0.5C and 137 mA h g −1 at 5C after 100 cycles.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Zhengjun Cheng,Lei Zhang,Xiao Guo,Xiaohui Jiang,Rong Liu
Removals of Lissamine rhodamine B (LRB) and acid orange 10 (AO10) using activated carbon/surfactant from aqueous solution were optimized. Box–Behnken design (BBD) has been employed to investigate the effects of different process variables (such as time of adsorption process, temperature, pH, and initial concentration of the dye) and analyze their interactive effects in the adsorption capacity for the two dye systems. The experimental data could be simulated accurately using second order polynomial regression models because they have high correlation coefficient values ( R 2 ) of 0.9920 and 0.9938, low p -value of 0.000, and their F values of 105.96 and 137.01 for the LRB and AO10 systems, respectively. The optimum conditions were found to be t = 120 min, T = 20 °C, pH = 11.0, and C LRB = 50 mg/L for the LRB adsorption, and t = 120 min, T = 20 °C, pH = 2.5, and C AO10 = 90 mg/L for the AO10 removal. The measured maximum experimental adsorption capacities for the LRB and AO10 systems under above optimum conditions were 218.08 mg/g and 405.15 mg/g, which agreed with their corresponding predicted values (229.43 and 400.51 mg/g) well due to small relative errors of 4.95% and −1.16%, respectively. The adsorption equilibrium and kinetics of the two dye adsorptions onto AC/DDAC were also investigated. The results indicated that Langmuir model presented the best fit and the pseudo-second-order model showed excellent fit to the kinetic data.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Libin Chen,Ying Zhang,Sheng Wang,Xiong Zheng,Maogang He
The thermal diffusivities of 2-methoxy-2-methylpropane (MTBE, mass purity, > 0.990, GC) were measured by using the dynamic light scattering method at T = (303.15 to 493.15) K and p = (1.5 to 10) MPa, including saturated liquid, saturated vapor, and compressed liquid. The expanded relative uncertainty in thermal diffusivity was estimated to be less than 2.0 % over the entire investigated range. The polynomial representation for thermal diffusivity of MTBE was proposed by employing the experimental results. Comparing the calculated results with the experimental data, the average absolute deviations are 0.59 % for saturated liquid, 0.38 % for saturated vapor, and 0.43 % for compressed liquid.
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
De-Fa Hou,Pei-Yao Li,Kai Zhang,Meng-Lei Li,Zi-Wei Feng,Cong Yan,Can Liu,Ming-Bo Yang
Fatty acid cellulose esters (FACE) are common cellulose-based thermoplastics, and their thermoplasticity is determined by both the contents and the lengths of the side chains. Herein, various FACE were synthesized by the ball-milling esterification of cellulose and fatty acyl chlorides containing 10–18 carbons, and their structures and thermoplasticity were thoroughly studied. The results showed that FACE with high degrees of substitution (DS) and low melting flow temperatures (Tf) were achieved as the chain lengths of the fatty acyl chlorides were reduced. In particular, a cellulose decanoate with a DS of 1.85 and a Tf of 186 °C was achieved by feeding 3 mol of decanoyl chloride per mole anhydroglucose units of cellulose. However, cellulose stearate (DS = 1.53) synthesized by the same protocols cannot melt even at 250 °C. More interestingly, the fatty acyl chlorides with 10 and 12 carbons resulted in FACE with superior toughness (elongation at break up to 94.4%). In contrast, due to their potential crystallization of the fatty acyl groups with 14–18 carbons, the corresponding FACE showed higher tensile strength and Young’s modulus than the others. This study provides some theoretical basis for the mechanochemical synthesis of thermoplastic FACE with designated properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）