JOURNAL OF PHYSICAL CHEMISTRY B
·
2022
·
IF 3.466
Shuting Wang,Laiben Gao,Nan Su,Li Yang,Fengli Gao,Xiaoqiu Dou,Chuanliang Feng
Chiral inversion of supramolecular assemblies is of great research interest due to its broad practical applications. However, chiral structure transition induced by in situ regulation of building molecules has remained a challenge. Herein, left-handed fibrous assemblies were constructed by C2-symmetic l-phenylalanine coupled with diethylene glycol (LPFEG) molecules. In situ hydrolyzing terminal diethylene glycol motifs in LPFEG successfully inverted the chirality of the nanofibers from left- to right-handedness. The transition of right-handed fibers into left-handed fibers could also be achieved via hydrolyzing DPFEG molecules. Circular dichroism (CD) spectroscopy, 1D and 2D nuclear magnetic resonance (NMR) spectroscopy, and Fourier transform infrared (FT-IR) spectroscopy revealed that the back-folded achiral diethylene glycol played a vital role in L/DPFEG molecular arrangements and removing terminal diethylene glycol could induce the opposite rotation of molecular assemblies. Thanks to this merit, the enantioselective separation of racemic phenylalanine was obtained and the enantiomeric excess (ee) values could achieve around ±20% after separation. This study not only provides a new strategy to regulate the chiral structure via dynamic modulation of terminal substituents but also presents a promising application in the field of enantioselective separation.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Qiong Wu,Zhuoyu Wang,Baozheng Zhao,Ruiyang Zhao,Shitao Yu,Lang Huang
Promoted ethylene glycol (EG) yield from cellulose hydrogenolysis is achieved via using Nickel-tungsten doped carbon catalysts prepared from glucose ( x %Ni- y %WO x -GC T ). Synchronously metal loading and carbon formation endow the catalyst excellent catalytic performance and high stability. Mechanistic investigations of the effects of metal loading and BrØnsted acid on EG yield are conducted. Increasing W loading promotes the content of polymerized WO x and consequently increases the amount of polytungstate species, thus lead to an improved BrØnsted acid content. Results reveal that promotion of B/L acid facilitates cellulose hydrolysis and suppresses isomerization of glucose to fructose. Besides, high W loading is beneficial for reduction of WO x to form W 5+ , producing oxygen vacancies to promote retro aldol condensation (RAC) of glucose to form acetaldehyde alcohol (an important intermediate for EG). By adopting the optimized 9%Ni-12%WO x -GC 700 catalyst, a 100% cellulose conversion with a high EG yield of 65% is obtained due to the synergistic interactions between BrØnsted acid, W 5+ and Ni 0+ active sites.
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MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Qian-Qian Zhang,Shu-Yi Ma,Xiang-Bing Li,Fang-Qiang Yuan
The ZnO-10, ZnO-20, ZnO-30, and ZnO-40 nanopetal-shaped samples were successfully synthesized by a hydrothermal method. The results of XRD, SEM, TEM, and BET indicate that the micro–nano petal-like samples have the advantages of high purity, good crystallinity, and large specific surface area. The ZnO-20 sample with the largest specific surface area and pore volume was prepared by adjusting the scheme without changing the sample morphology. The specific surface area and pore volume of the sample were 33.6914 m 2 /g and 0.1561 ml/g. The results of gas sensitivity test show that the sample has the highest response and super good gas sensitivity selectivity. At 250 ∘ C, the responses to 5 ppm and 50 ppm ethylene glycol can reach 14.4 and 293, respectively. Because of the excellent gas performance of ZnO nanosheets, this work can provide a theoretical basis for the research and development of ultra-sensitive ethylene glycol gas sensors in the industry.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-9
·
IF 2.8
He Dan,Zhu Dandan,Zheng Zhen,Wang Xinling
In recently years, polyol prepared from biobased renewable resources has attracted researchers' attention to synthesize green environmental polyurethane. Among numerous polyols, poly (trimethylene ether glycol) (PO3G) is used to prepare polyurethane due to outstanding performances. This paper aims to prepare photosensitive polyurethane acrylate based on 100% renewable PO3G with low viscosity, great flexibility and fast curing speed. The physical and thermal properties of materials were characterized by FTIR, ATR, DSC and DMA. The mechanical properties were measured emphatically. All the results suggest the prepared PO3G-based resins exhibit excellent strength and flexibility with low viscosity. On the other hand, the blocking agent with dynamic covalent bond was introduced to ensure the low viscosity of resins under UV curing. With the break of blocking agent, the isocyanate group could be fully released and carry out chain extension with amine during secondary curing to form polyurethane network and comprehensive performance of resins. Furthermore, the prepared materials have significant advantage and show good application potential in UV-curing 3D printing.
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Catalysts
·
2023
·Vol. 13
·期 4
·659
·
IF 3.9
Yuxin Wang,Yinxiu Jin,Minghan Jia,Hu Ruan,Xuefen Tao,Xuefeng Liu,Guang Lu,Xiaodong Zhang
CeVO4-V2O3composites were prepared by simple hydrothermal method, and the effects of ethylene glycol(EG) on the products were studied by XRD, N2adsorption–desorption, SEM, EDS, XPS, PL and UV-vis spectra. The characterization reveals a slight decrease in surface area and a slight enhancement of visible light absorption in the final sample, while the crystalline phase, morphology and separation efficiency of the collective carriers are severely affected by the EG. At the same time, the photocatalytic effect of CeVO4-V2O3composites was evaluated by the degradation rate of methylene blue (MB) under simulated visible light. The sample for 10 mL EG obtained the highest efficiency of 96.9%, while the one for 15 mL EG showed the lowest efficiency of 67.5% within 300 min. The trapping experiments and ESR experiment showed that the contribution of active species to the photocatalytic degradation of MB was ∙OH > h+> ∙O2−in descending order, and a possible degradation mechanism was proposed.Keywords:ethylene glycol;CeVO4-V2O3;methylene blue oxidation;visible light
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hui Li,Shufeng Shen
Kinetics of the reaction of carbon dioxide (CO2) with potassium prolinate (ProK) in water-lean ethylene glycol was measured using a stirred cell reactor at temperatures from 283.2 to 313.2 K with ProK concentrations ranging from 0.5 to 2.0 M. Physicochemical properties including Henry’s constant of N2O and CO2 were measured or estimated for the investigated solutions. A proposed correlation was used to calculate the liquid-side physical mass transfer coefficient. The observed reaction rate constants (kobs) were obtained from the measured absorption flux against CO2 partial pressure under the pseudo-first-order regime conditions. Results show that the overall pseudo-first-order rate constant kov increases remarkably as the increasing ProK concentration and temperature. The reaction order with respect to ProK is found to vary between 1.76 and 1.91 over the temperature range, which is quite different from that observed in aqueous ProK systems. The kinetic results were also nonlinearly regressed to fit the models based on zwitterion mechanism and termolecular mechanism. The expression for the rate of CO2 absorption was proposed as a function of the temperature and ProK concentration for the experimental conditions studied.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Chunyan Chen,Liujun Jin,Hongyuan Shang,Tongxin Song,Fei Gao,Yangping Zhang,Caiqin Wang,Cheng Wang,Yukou Du
Designing and fabricating highly active and efficient catalysts are of vital importance for the practical applications of direct ethylene glycol fuel cells (DEGFCs). In this study, we employ a feasible one-pot synthetic method to construct highly monodispersed PtCu nanospheres (NSs) as high-efficiency anode electrocatalysts for DEGFCs. Interestingly, the optimized carbon supported Pt 1 Cu 1 NSs can display the highest mass activity of 2146.9 mA mg −1 in 1 M KOH + 1 M EG solution under the scan rate of 50 mV s −1 , which is 1.9 times higher than that of commercial Pt/C catalysts. This is ascribed to the favorable electronic effect between Pt and Cu, which is beneficial for ethylene glycol oxidation reaction (EGOR) in fuel cells. Meanwhile, such monodispersed Pt 1 Cu 1 NSs can also exhibit excellent durability, where the Pt 1 Cu 1 catalyst retains 62.6% of the initial value after the cyclic voltammetry of 500 cycles. This work not only provides a significant approach for designing catalysts for fuel cells, but also constructs a novel class of active and stable electrocatalysts for EGOR.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2018
·Vol. 43
·期 3
·300-307
·
IF 1.749
Xiangjun Meng,Zhenggang Xiao
The sensitivity study of propellants has been receiving heightened attentions from a lot of investigators. These propellants based on nitrocellulose are sensitive to accidental stimuli that result in catastrophic accidents. Thus energetic thermoplastic elastomers have been used as binders to replace some nitrocellulose to prepare insensitive high energy propellants. However, some defects are presented in the application of these binders. Based on the reason above, a novel binder named as step ladder-like nitrocellulose was synthesized by isophorone diisocyanate reacting with free hydroxyl groups of nitrocellulose first, and then reacting with polyethylene glycol. The reaction product was characterized by FT-IR, XRD, SEM, TGA, DSC and sensitivity tests. Results show that step ladder-like nitrocellulose is successfully synthesized from nitrocellulose, and it has a quasi-spherical shape and regular crystal structure. Furthermore, the thermal weight loss course of step ladder-like nitrocellulose is relatively gentle in the range of 175–450 °C and its mechanical sensitivity is less than that of raw nitrocellulose.
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FUEL
·
2018
·
IF 4.908
Jiajun Gao,Shuang Zhu,Yafen Dai,Chunyan Xiong,Chunxi Li,Weimin Yang,Xingmao Jiang
Polyethylene glycol (PEG) is not satisfactory for the removal performance of thiophenic sulfurs, e.g., low S-partition coefficient K N (S). The unsatisfactory K N may be due to relatively low content of active O atom on PEG. Modification replacing – OH group with – OCH 3 group can produce modified PEGs that have the higher active O-content. Polyethylene glycol dimethyl ether, which was commonly known as NHD, showed the higher K N than PEG. Its K N for dibenzothiophene (DBT) can reach as high as 3.99. The higher K N was dominantly ascribed to the contribution of the active O atom: (1) H-bonding with DBT; (2) group similarity between C-O-C and C-S-C. Further, methoxy polyethylene glycol (mPEG) showed the best selectivity for DBT to toluene, compared with NHD and PEG. The best selectivity of mPEG may be attributed to its higher active O-content than PEG’s and its stronger polarity than NHD’s. Moreover, NHD and mPEG can be regenerated and recycled for several times without significantly decreasing the desulfurization performance.
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ACS Biomaterials Science & Engineering
·
2017
·
IF 3.234
Hong-Yin Wang,Jie Sun,Liu-Yuan Xia,Yan-Hong Li,Zhan Chen,Fu-Gen Wu
Immunofluorescence staining is a crucial tool for studying the structure and behavior of intracellular proteins and organelles. During the staining process, the permeabilization treatment is usually required to enhance the penetration of a fluorescent antibody into the cells. However, since most of the membrane imaging dyes as well as the membrane lipids will detach from the cell surface after permeabilization, membrane labeling using these dyes is not compatible with immunofluorescence staining. Herein, by linking cholesterol-polyethylene glycol (PEG-Chol) and fluorescein isothiocyanate (FITC) with the amine-rich glycol chitosan (GC), we prepared a multifunctional polymeric construct, GC-PEG Chol-FITC, and realized permeabilization-tolerant plasma membrane imaging. Owing to the presence of abundant amine groups in the labeling reagent and the membrane proteins/lipids, the addition of paraformaldehyde in the fixation step induces the amine-cross-linking between the labeling reagents and the membrane proteins/lipids, thus preventing the detachment of fluorophores from the cell surface after permeabilization. Besides, the large molecular weight effect of the imaging reagent may also account for its antipermeabilization property. Furthermore, by combining immunofluorescence staining with the plasma membrane labeling by GC-PEG Chol-FITC, we simultaneously imaged the plasma membrane and cytoskeletons, and clearly observed metaphase cells and binucleated cells. The concept of using amine-rich polymeric dyes for plasma membrane imaging will inspire the development of more permeabilization-resistant membrane labeling dyes with better performance, which can realize simultaneous membrane and intracellular protein imaging and facilitate the future studies of membrane–intracellular protein interactions.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2017
·Vol. 106
·期 1
·192-200
·
IF 3.076
Jing-Xiao Chen,Jing Yuan,Ya-Ling Wu,Ping Wang,Peng Zhao,Guo-Zhong Lv,Jing-Hua Chen
In this study, a series of poly(ethylene glycol)/collagen (PEG/Col) double network (DN) hydrogel is fabricated from PEG and Col. Results of the compressive strength test indicate that the strength and toughness of these DN hydrogels are significantly enhanced. The fracture strength of PEG/Col DN hydrogels increases by 9- to 12-fold compared with that of PEG single network (SN) hydrogel, and by 36- to 48-fold compared with that of Col SN hydrogel. Taking advantage of both PEG and Col building blocks, the PEG/Col DN hydrogels possess a strengthened skeleton. Moreover, the water-storage capability and favorable biocompatibility of Col are effectively maintained. Given that the DN hydrogels can provide the appropriate environment for the adhesion, growth, and proliferation of MC3T3-E1 cells, PEG/Col DN hydrogels have potential as a load-bearing tissue repair material. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 192–200, 2018.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2012
·
IF 2.237
Jun Li,Chenjia You,Lifang Chen,Yinmei Ye,Zhiwen Qi,Kai Sundmacher
To reduce the high energy consumption and equipment corrosion in conventional processes of CO2 capture with aqueous amine solutions, the mixed nonaqueous solvents of monoethanolamine (MEA), diethanolamine (DEA), and diglycolamine (DGA) with polyethylene glycol (PEG) as cosolvent were explored for CO2 capture. The dynamic experiments of CO2 absorption and desorption were carried out to evaluate the performance of the studied nonaqueous solutions. It demonstrated that the mixed solutions of amines and PEG exhibited higher CO2 cyclic capacity and regeneration efficiency compared with the only aqueous amine solutions. Especially, the solution of 3 mol/L DGA-PEG200 exhibits a high cyclic capacity of 0.438 mol CO2/mol DGA and a high regeneration efficiency of 94.6%, which indicates its great potential in industrial application. Moreover, the very low vapor pressure of PEG helps the mixed solution for CO2 capture with reduced corrosion, energy consumption, and environmental pollution.
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