CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Jiashen Xu,Xinyu Gu,Changqing Ye,Yukou Du
In the field of electrocatalysis, Sb doping was first exploited for formic acid oxidation, thereby laying the groundwork for Sb-based catalytic materials; meanwhile, previous studies have demonstrated that Br - ions can effectively tailor the morphology of metals such as Au and Ag, offering a transferable strategy for the shape optimization of other metallic nanostructures. However, the application of PtSb alloys in the electro-oxidation of polyols remains scarce, and the precise morphological control of PtSb nanomaterials to boost catalytic performance is still an urgent challenge. Inspired by the documented role of Br - , this work successfully synthesized PtSb nanomaterials and achieved a directed transformation from nanoparticles to nanowires through Br - -mediated modulation. Systematic characterization and electrochemical evaluation revealed that the resultant PtSb nanowires exhibited exceptional activity in ethylene-glycol and glycerol oxidation, delivering mass activities of 10,600 and 6656 mA/mg Pt , respectively. After 4000 s of continuous electrochemical testing, the nanowires retained stable residual activities of 1358 and 615 mA/mg Pt in the two electrolytes, significantly surpassing those of commercial Pt/C. By minimizing noble-metal usage while simultaneously enhancing both activity and stability, this study provides new insight for the development of high-performance fuel-cell catalysts.
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高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Fang Tian,Shiqi Zhang,Min Zhai,Jian Sui,Xiaozheng Lan,Jigang Gao
Polyethylene glycols (PEG, average molecular weight 2000, and 10,000) are embedded in silica gels (SG) with pore diameters of d = 10–200 nm. The PEG/SG composites were analyzed using differential scanning calorimetry (DSC), scanning electron microscope (SEM) and powder X-ray diffractions (XRD). Inside the nanopores, melting temperatures of the PEG and the depression of the melting points, have linear relation with the reverse pore size. The latent heat is reduced with the decreasing pore size. The composites remained no leakage of PEG above the melting point in pore fillingness of 80%. In a short-term thermal cycling, the composites display stable melting points and heat storage capacities. The diffractions of PEG in the pores show the same patterns with the bulk, revealing a same structure basis with good heat storage performance. The nano-sized PEG act as a series of new phase change materials obtained by adjusting the size.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2013
·
IF 2.487
Qiang Wu,Dong-Qiang Lin,Shan-Jing Yao
The aqueous two-phase system (ATPS) with polyethylene glycol (PEG) and hydroxypropyl starch (HPS) was evaluated for the extraction of human immunoglobulin G (IgG) from human serum albumin (HSA). The partitions of IgG in PEG/sulphate, PEG/phosphate, PEG/Dextran and PEG/HPS ATPSs were compared, and the results indicated that PEG/HPS system was most suitable for IgG extraction. The effects of the concentrations of PEG, HPS and NaCl addition and pH on the partition of IgG and HSA in PEG/HPS ATPS were investigated. It was found that with 15% NaCl addition at pH 8.0 IgG could be largely recovered in the top PEG-rich phase and most of HSA kept in the bottom phase. In addition, the response surface methodology (RSM) was used to optimize the extraction of IgG from the protein mixture of IgG and HSA. The optimal conditions were obtained as 12% (w/w) PEG 4000, 18% (w/w) HPS and 10% (w/w) NaCl at pH 8.0. The extraction yield of IgG in the top phase was 99.2% and the purification factor could reach 5.28. The back extractions of IgG into a phosphate-rich bottom phase were also studied. The total purification factor was 5.73 with the yield of 84.0%. The results indicated that PEG/HPS ATPS might be a promising alternative for the primary recovery of IgG from the complicated feedstock.
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MACROMOLECULES
·
2022
·
IF 6.057
Yujian Liu,Yongyao Lei,Yougen Chen
The current contribution presents the synthesis of poly[oligo(ethylene glycol) sorbate]s (PREGmSs) by the t-Bu-P4-catalyzed group transfer polymerization (GTP) method, their postpolymerization modification at the backbone double bond, and thermoresponsive properties in aqueous solution. Four oligo(ethylene glycol) sorbate monomers (REGmSs), including 2-(2-methoxyethoxy)ethyl sorbate (MeEG2S), 2-(2-(2-methoxyethoxy)ethoxy)ethyl sorbate (MeEG3S), 2-(2-(2-ethoxyethoxy)ethoxy)ethyl sorbate (EtEG3S), and 2-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)ethyl sorbate (MeEG4S), are newly designed to study the thermoresponsive properties of their related polymers. The t-Bu-P4-catalyzed GTP of REGmS only proceeds in a 1,4-regioselective addition manner to quantitatively produce the backbone trans-rich (ca. 80%) PREGmS. The complete hydrogenation and epoxidation of the backbone double bonds result in hydrogenated and epoxidized polymers (PREGmS-H2 and PREGmS-epoxy, respectively), which have different main-chain structures and rigidity from their parent PREGmS. Given the 1,4-substituted structure of a sorbate monomer, the chemical structure determination of PREGmS-H2 by 13C NMR spectra demonstrates that the above polymers have an erythro-rich (ca. 60%) structure in diastereochemistry and a diisotactic/disyndiotactic ratio around 1:1 in stereoregularity. The thermoresponsive properties of PREGmS, PREGmS-H2, and PREGmS-epoxy in aqueous solutions are studied in detail from various aspects in terms of polymer mass concentration, molecular weight, length and end group of the oligo(ethylene glycol) side chain, and main-chain structure by turbidity, 1H NMR spectroscopy, and dynamic light scattering (DLS) methods, which are discussed below.
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高影响因子
STARCH-STARKE
·
2011
·Vol. 63
·期 10
·625-631
·
IF 1.261
Jiwen Wang,Wentao Zhai,Wenge Zheng
The main target of this study is to synthesize one kind of granular cold-water-soluble (GCWS) starch by grafting poly(ethylene glycol) (PEG) segments onto the surface of native starch granules. It is found that the grafting process could introduce long PEG chains onto the granule surface, resulting in the presence of special micropits on the granule surface, as characterized by SEM. The cold water solution test verified that the resultant PEG-grafted corn starches exhibited excellent cold-water-solubility. The XRD analysis and further polar optical micrograph (POM) observation indicated that the crystallites structure inside the PEG-grafted corn starches was fully preserved, since no gelatinization process was involved. The present study provides a new train of thought that we can adjust the physiochemical properties of starch granules with proper surface modification.
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IONICS
·
2024
·Vol. 30
·期 9
·5675-5683
·
IF 2.4
Zhao Xuanye,Wang Honglei,Guliqire Tuersun,Sun Changshuo,Yang Changping
Inadequate ionic conductivity and freezing of the electrolyte are considered one of the main problems in low-temperature electrochemical energy storage. Mixing two or more solvents can reduce the overall freezing point of the solution and also increase the ionic conductivity at low temperatures. Therefore, using the co-solvent method to prepare electrolytes is crucial for preventing electrolyte freezing and improving ion conductivity. In this paper, ethylene glycol (EG) was used as a low-temperature co-solvent and an electrolyte with a freezing point lower than − 80 ℃ was obtained by the introduction of a volume fraction of 20% ethylene glycol in 4.5 mol L −1 LiCl aqueous solution. The resulting electrolyte exhibited high ionic conductivity (1.143 mS·cm −1 ) at − 60 ℃ and low viscosity (1.391 mPa·s) at 20 ℃. The molecular dynamics (MD) simulations and FITR results indicate that hydrogen bonds can be effectively formed between ethylene glycol and water molecules, which facilitate the electrolyte to operate at low temperatures. Additionally, the supercapacitor was able to operate better even at − 60 °C by introducing ethylene glycol into the electrolyte.
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Materials Research Express
·
2021
·Vol. 8
·期 6
·065505
·
IF 1.62
Longfei Zhang,Shuai Zhang,Cheng Wang,Wa Li,Lirong Yang,Shanggeng Li,Jiaming Hu,Lin Zhang
A porous material (PEA) was prepared by the ring opening polymerization of polyethylene glycol diglycidyl ether with adenine in a simple sol-gel method. The structure and composition of PEA were characterized by SEM, FT-IR, BET and XRD. The adsorption experiments of copper ion by PEA at different pH, temperature, contact time and initial concentration were studied. The results show that the PEA is macroporous, the optimum adsorption pH is 5 and the saturated adsorption time is 180 min. The maximum equilibrium adsorption capacity of copper ion is 80.1 mg g−1 at 40 °C according to the Langmuir model and the competitive adsorption test shows that PEA has good adsorption on copper ion, but low effect on cobalt, cadmium and nickel. The repeated adsorption experiments show that PEA could still adsorb 82% of the first adsorption capacity after 5 times elution. These results indicate that the PEA can be used as a practical adsorbent for copper ion adsorption in aqueous solution.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaohui Fu,Zheng Li,Min Lin,Jing Sun,Zhibo Li
A series of N -alkylated glycine and l -alanine bearing oligoethylene glycol (OEG) and benzyl side chains, i.e., N -(4-oligoethylene glycol)benzyl glycine and N -(4-oligoethylene glycol)benzyl alanine (NMe(OEt) x OBnG and NMe(OEt) x OBnA, x = 1–3), have been readily synthesized via schiff base and reductive amination reactions. The successful ring opening polymerization (ROP) of N -substituted glycine N -carboxyanhydrides (NCA) results in three types of peptoid oligomers (PNMe(OEt) x OBnG, x = 1–3). Depending on the length of OEG side chains, PNMe(OEt) x OBnG show different solubility in water. Particularly, the as-prepared oligomers containing three ethylene glycol units (PNMe(OEt) 3 OBnG) display interesting thermoresponsive aggregation behaviors in water. DSC results reveal that all the oligomers show crystalline behaviors with melting temperatures decreasing as the OEG side chain length is increased. Both live-dead and MTT assays indicate low cytotoxicity of PNMe(OEt) 2 OBnG and PNMe(OEt) 3 OBnG toward HeLa cells, comparable to benchmark PEG. Concerning thermoresponsive and crystalline properties, the as-prepared peptoid oligomers are potentially promising building blocks for stimuli-responsive bioinspired materials and hierarchical self-assembly.
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Tao Cai,Dan Liu,Shenggao Liu
Solid polyelectrolyte grafted carbon dots as a precursor were synthesized using citric acid and poly(sodium 4-styrene sulfonate) via pyrolysis route, which were then capped by block copolymer to produce solvent-free carbon dots-based ionic fluid (CDs-PSS-M2070). The tribological performance of CDs-PSS-M2070 under different concentrations and loads was evaluated in polyethylene glycol (PEG). The results verified that CDs-PSS-M2070 efficiently improved the friction-reducing and wear-resistance performance as well as the load-bearing capacity of PEG in a broad load. The addition of 1.0% CDs-PSS-M2070 reduced wear volume of 82.8% and friction coefficient of 73.5% under the load of 392 N. Owing to the excellent dispersion of carbon dots ionic fluid in PEG, CDs-PSS-M2070 could continue to transfer to the frictional interface and form a continuous carbon-rich oil-film, thereby enhancing friction-reducing and wear-resistance abilities efficiently.
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Russian Journal of Physical Chemistry A
·
2025
·Vol. 99
·期 7
·1487-1493
·
IF 0.8
Lv Hao,Wen-hao Mai,Ya-yuan Zheng,Huai-ming Du,Bo Xing
Ammonium dihydrogen phosphate (MAP) is a highly efficient compound fertilizer and industrial raw material, yet commercial industrial-grade MAP often contains a substantial amount of impurities and presents issues with particle size distribution and shape. These factors make it unsuitable for use as battery-grade MAP, necessitating the study of MAP’s crystallization in H 2 O–Ethylene Glycol (EG) binary systems to identify potential solutions. This paper explores the thermodynamic process of MAP crystallization in these systems. It reports the results of a comprehensive study on the effects of H 2 O–EG binary system proportions on MAP’s thermodynamics. This research employs a range of established models, including the Apelblat model, Van’t Hoff model, and Redlich–Kister model, to correlate the experimental data and determine the thermodynamic parameters associated with MAP’s crystallization process. Furthermore, the Mersmann equation and Barata equation are utilized to calculate the solid-liquid surface tension (γ) and the crystal surface entropy factor ( f ) of MAP in the systems. The thermodynamic experimental results of this paper provide a preliminary research foundation for the crystallization kinetics of MAP. The findings indicate that the dissolution of MAP is an endothermic and non-spontaneous process, primarily driven by enthalpy changes. The Apelblat model appears to offer a superior description of MAP’s solubility. The findings of this study are of significant importance to designers engaged in the industrial crystallization process of MAP. They provide valuable information for the optimization and improvement of the production process of MAP, thereby enhancing its quality and efficiency.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shucheng Liu,Bo Li,Xiangxiang Huang,Zhe Kong,Guiqing Cheng,Zhongwei Wang,Qing Yu,Shihui Han,Long Chen
Carbon black/SiO 2 /LLDPE (CB/SiO 2 /LLDPE) is a commonly used polymer material with a positive temperature coefficient (PTC). However, the inferior reproducibility of PTC significantly restricts its service life. The objective of this study is to enhance the PTC reproducibility of CB/SiO 2 /LLDPE material. Polyethylene glycol (PEG) was chosen as the additive, and its effects on SiO 2 dispersion, PTC reproducibility, and electrothermal performance were studied in detail. A more stable SiO 2 /CB synergistic filler network was formed after the incorporation of PEG, which results in a significant improvement in PTC reproducibility. The variation of PTC intensity change rate after 10 heating–cooling cycles decreased by 19.4% after the incorporation of 5 wt% PEG. Additionally, the electrothermal performance of the PEG modified CB/SiO 2 /LLDPE composites was also enhanced with a 15.3°C increase in equilibrium temperature under a DC voltage of 140 V. This study offers an effective strategy for developing high-performance PTC materials.
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高影响因子
Nature Communications
·
2025
·
IF 15.7
Liang Nan-Nan,Wang Haibin,Wei Yi,Wang Teng,Yu Wenhe,Yin Zehong,Zhao Yilin,Mao Tingting,Han Jingrui,Zhao Yong-Yan,Huang Jianan Erick,Luo Mingchuan
The electro-oxidation of ethylene to ethylene glycol (EG) offers a sustainable pathway for chemical manufacturing, but demands selective non-precious-metal (NPM) electrocatalysts. Here, we design and fabricate a class of arrayed Mn 2 O 3 electrode, which shows a high EG selectivity in practically-favorable aqueous electrolytes among NPM catalysts. By screening various manganese oxides, we first pinpoint Mn 2 O 3 to be the most selective to EG. Density functional theory calculations further reveal that the (111) facet facilitates the second OH* addition to * C 2 H 4 OH, the rate-limiting step toward EG. These fundamental findings motivate us to controllably synthesize the (111)-dominant Mn 2 O 3 nanoarrays, which deliver a 52.6 % Faradaic efficiency for EG—the highest for NPM electrocatalysts in aqueous media. Electrochemical and operando spectral studies verify that stabilizing moderately oxidized Mn (III) state under operational anodic bias is essential to the high selectivity of EG. Our findings highlight the crucial role of Mn surface chemistry in steering alkene oxidation and advance the electrosynthesis of EG closer to practicability.
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PubMed
高影响因子
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