POLYMER COMPOSITES
·
2023
·Vol. 45
·期 2
·1524-1533
·
IF 5.2
Xi Guo,He Jiang,Chendong Qiu,Tonghua Lu,Renzhong Wei,Mizi Fan,Yi Zhang,Weisheng Sun
Phase-change material (PCM) has great thermal energy ability, which has been used as building material for energy conservation. While the most widely used solid–liquid PCM usually appeared leakage during the phase change transition. In order to overcome the leakage of solid–liquid PCM and prepare a viable building energy-saving materials for indoor temperature regulation, thermal energy storage composites were prepared by utilizing cellulose grafted PEG as phase change material (PCM) and high-density polyethylene (HDPE) as the substrate. The liquid leakage of PEG was solved after graft to fabricate solid–solid PCM. HDPE is beneficial for solving the leakage and improving the mechanical property by its secondary encapsulation. The synthesized Cellulose-PEG was characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD), and differential scanning calorimetry (DSC). Thermal and mechanical characteristics of the composite were explored. The outcomes revealed that: (1) PEG was successfully grafted to the surface of cellulose and Cellulose-PEG showed solid–solid phase change behavior. (2) Both the melting-cooling temperatures and the thermal stability of solid–solid wood plastic composite (SSWPC) had the potential as thermal energy storage material for temperature regulating. (3) The addition of Cellulose-PEG adversely affected moisture resistance, flexural property, and impact strength due to the weak interface bonding. The physical and mechanical degradation was tolerable for applying situation where mechanical performance is less crucial. Highlights Cellulose-PEG showed solid–solid phase change behavior without liquid leakage. High-density polyethylene (HDPE) was used as the matrix to realize the second encapsulation of PCM. Cellulose-PEG negatively influenced the physical and mechanical property of HDPE. Solid–solid wood plastic composite presented great thermal storage capacity for indoor temperature regulating.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Li Bai,Mei Wu,Huazhong Yu,Shima Liu,Ke Song,Xianwu Zhou,Jie Guo,Jian He
Acetalization is a promising method for upgrading biomass-derived molecules into valuable chemicals, and acetal products are considered excellent oxygenated fuel additives. Herein, a catalyst-free, facile, and effective protocol for the acetalization of furfural and ethylene glycol is established, affording a 78.6% yield of 2-(furan-2-yl)-1,3-dioxolane with a furfural/ethylene glycol molar ratio of 1:15 in cyclohexane at 160 °C after 2 h. Moreover, the lower activation energy (15.8 kJ/mol) corroborates that the established system is efficient, and the thermodynamic studies demonstrate that catalyst-free acetalization is an endothermic, nonspontaneous, and endergonic reaction. A plausible mechanism including two pathways for catalyst-free acetalization of furfural and ethylene glycol is proposed, wherein the formed water from the acetalization process can render the ethylene glycol to be hydrolyzed, which plays a positive role in facilitating the acetalization of furfural and ethylene glycol. In addition, the excess ethylene glycol in the reaction mixture can be easily recovered and almost shows the same activity as fresh ethylene glycol in catalyst-free acetalization. Furthermore, the established catalyst-free protocol is viable for various biobased furanic compounds and alcohols, enabling broad access to various acetals. Finally, catalyst-free acetalization of furfural and ethylene glycol can be magnified to 10 times, showing the promising potential of large-scale production.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Weiyang Shen,Yongxin Wang,Yali Li,Zongyao Cui,Yitong Yang,Honglu Shi,Chenfeng Xu,Tingjie Yin
Bacterial infections would cause pathological inflammation and even generate chronic wound. Herein, a ciprofloxacin (Cip)-loaded mild acid-responsive electrospinning nanofiber membrane (NFM) containing 3-diethylaminopropyl isothiocyanate material grafted glycol chitosan (GC-DEAP) was fabricated to prevent bacterial infection against hemostatic and inflammatory phases of wounds. The presence of Cip and GC-DEAP in the objective NFM (PCL/GC-DEAP/Cip) was confirmed through XRD and FTIR. Meanwhile, PCL/GC-DEAP/Cip NFM exhibited high mechanical profiles, suitable water absorption and water vapour transmission ratio. The non-protonated amphiphilic GC-DEAP under pH 7.4 facilitated the formation of uniform and smooth nanofibers with polycaprolactone (PCL) and Cip. However, the GC-DEAP was demonstrated to sharply respond to the mild-acid environment of the wound and effectively be protonated, and thus improved the swelling ability of NFM and triggered burst release of Cip. Due to the combination between protonated GC-DEAP and Cip, PCL/GC-DEAP/Cip NFM achieved attractive antibacterial activity in the mild-acid environment in vitro , and induced more efficient prevention of wound infection and faster wound healing compared with the commercial chitosan dressing. The designed NFM is expected to be a potential smart wound dressing against hemostatic and inflammatory phases with mild-acid specifically strengthened antibacterial features and satisfactory biocompatibility.
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MOLECULES
·
2023
·Vol. 29
·期 1
·66
·
IF 4.6
Meng Zhang,Xue Zhuang,Siqi Li,Yansong Wang,Xiangyu Zhang,Jinlian Li,Dongmei Wu
Binary ethosome vesicles have been developed as flexible lipid vesicles for the enhanced physicochemical stability and skin delivery of drugs. This work aimed to prepare phloretin-loaded propylene glycol ethosomes (PHL-PGEs) to improve their stability, skin permeability and antioxidant activity. PHL-PGEs were prepared via the ethanol injection method and optimized using different weight ratios of ethanol to propylene glycol (PG). When the ethanol/PG mass ratio changed from 10:0 to 0:10, the encapsulation efficiency and stability of ethosomes increased. At a PHL concentration of 1mg/mL, the EE% was 89.42 ± 2.42 and the DL% was 4.21 ± 0.04, which exhibited their highest values. The encapsulation of the PHL in the PHL-PGEs was strengthened via XRD analysis and FTIR analysis. The results of the in vitro percutaneous permeability test demonstrated that the combined use of ethanol and PG exhibited a notable enhancement in skin permeability, and the skin retention of PHL-PGEs was 1.06 times that of PHL-ethosomes (PHL-Es) and 2.24 times that of the PHL solution. An in vitro antioxidant activity study indicated that solubility and antioxidant activity was potentiated via the nanoencapsulation of phloretin. Therefore, these results confirm the potential of this nanocarrier to enhance physicochemical stability, skin permeability and antioxidant activity.Keywords:binary ethosomes;propylene glycol;skin permeability;antioxidant activity
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 14
·7259-7267
·
IF 4.4
Tian Wenshuang,Xiao Yang,Zhou Beiting,Qin Guangzhao,Zheng Xiong
As a new type of green solvent, deep eutectic solvents (DESs) are regarded as substitutes for ionic liquids in various applications, so the study of thermophysical properties of DESs is of great importance for their applications. In this work, DESs containing triethylene glycol as hydrogen bonding donor and choline chloride (ChCl) as hydrogen bond acceptor were synthesized in a series of molar ratios, and the thermal conductivity, viscosity, and density were investigated systematically. The addition of ChCl suppresses the thermal conductivity of DESs, but increases the viscosity and density, and the mechanism of the dependence of the thermophysical properties on the molar fraction is analyzed. The increase in the temperature always causes a decrease in the viscosity and density, while the thermal conductivity and temperature show a parabola dependence. Besides, the increase in the pressure results in the enhancement of thermal conductivity. Moreover, the thermophysical properties of DESs are fitted into correlations, and the AADs and MDs from fitted values and experimental data are 0.39% and 2.14% for thermal conductivity, 1.34% and 2.49% for viscosity, and 0.04% and 0.11% for density, respectively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haifan Wang,Menglei Yuan,Jingxian Zhang,Yiling Bai,Ke Zhang,Bin Li,Guangjin Zhang
Ammonia (NH 3 ) synthesis at mild conditions by electrocatalytic nitrogen reduction (eNRR) has received more attention and has been regarded as a promising alternative to the traditional Haber–Bosch process. Lewis acid-base pairs (LPs) can chemisorb and react with nitrogen by electronic interaction, while the tuning of the microenvironment near electrode can hinder hydrogen evolution reaction (HER) thus improving the selectivity of the eNRR. Herein, the FeOOH nanorod coupled with LPs on the surface (i.e., Fe, Fe–O) was synthesized, which could effectively drive eNRR. Meanwhile, polyethylene glycol (PEG) was introduced to serve as a local non-aqueous electrolyte system to inhibit HER . The prepared FeOOH-150 catalyst achieved outstanding eNRR performance with an NH 3 yield rate of 118.07 μg h −1 mg cat −1 and a Faradaic efficiency of 51.4 % at −0.6 V vs. RHE in 0.1 M LiClO 4 + 20 % PEG . Both the experiment and DFT calculations revealed that the interaction of PEG with Lewis base sites could optimize nitrogen adsorption configuration and activation.
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Zhang Hao,Zhang Xia,Li Wenzhi,Wu Wenjian,Tang Bingyue,Zhu Chen
Efficient extraction of lignin from intricate lignocellulose is a challenge for the high-value utilization of lignocellulosic biomass in sustainable biorefinery. In this work, a p -toluene sulfonic acid-coupling ethylene glycol (PTSA/EG) pretreatment was developed to extract lignin from cornstalks. The results showed that the synergistic effect between p -toluene sulfonic acid and ethylene glycol resulted in an increase in the delignification ratio from 43.43 to 85.37% compared with PTSA aqueous pretreatment. When the concentration of PTSA was 5 wt.%, the delignification ratio reached 85.37% at 383.15 K under the PTSA/EG pretreatment. Moreover, the lignin fractions obtained by water precipitation have high purity (>90%) and a low molecular weight (1777~2271 Da). The fractionated lignin was depolymerized with Ru/C catalyst and methanol at 508.15 K for 3 h. When the pretreatment temperature is 368.15 K, the fractionated lignin has a good depolymerization performance, and the detected monomers yield reaches 17.46%. Overall, pretreatment using PTSA and EG could realize the disruption of the degradation barrier of lignocellulose and fractionate lignin with specific structures by adjusting the pretreatment conditions, which was conducive to commercial applications in biomass refining.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 20
·47406
·
IF 2.188
Qing Chen,Fei Sun,Jin Zhou,Yao Lu,Yuan-Yuan Li,Hai-Yin Yu,Jia-Shan Gu
To improve chlorine resistance and mitigate the internal concentration polarization (ICP), a membrane surface was tethered with poly(ethylene glycol) methacrylate (PEGMA). Characterization by attenuated total reflection–Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy analysis, and field emission scanning electron microscopy indicated the successful tethering of PEGMA onto the membrane. The antifouling and antichlorine characteristics were assessed in reverse osmosis (RO) and forward osmosis (FO) processes. The water flux increased obviously to 85.00 from 60.00 L m −2 h −1 (LMH) in the RO process; the chlorine stability of the modified membrane was improved. The greatly reduced structural parameters indicated that the ICP of the FO membrane was successfully alleviated; the water flux decreased greatly for the original membrane from 3.40 to 0.01 LMH, whereas it fell only slightly from 10.99 to 9.32 LMH for the modified membrane during synthetic sewage treatment. The ICP was greatly mitigated; the antichlorine performances and the antifouling characteristics drastically improved after grafting with PEGMA. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47406.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Feng Wang,Jinwen Zhu,Tingting Yan,Xiaomei Pei,Fuming Zhang,Robert J. Linhardt
A thermo-responsive amphiphile was developed from oligo-phenylalanine [oligo(Phe)]. The hydrophobic moiety of the amphiphile, oligo(Phe) was synthesized via reverse hydrolysis catalyzed by bromelain in dimethyl sulfoxide and dioxane solutions. The production of oligo(Phe) increased by 80.7% by screening suitable reaction conditions. The average degree of polymerization of oligo(Phe) was determined to be four by 1 H NMR. By grafting with aldehyde-ended methoxypolyethylene glycol (mPEG), oligo(Phe) was converted to amphiphilic oligo(Phe)-mPEG. The surface tension of oligo(Phe)-mPEG solution increased with decreasing chain length of the mPEG moiety. Cytotoxicity studies showed oligo(Phe)-mPEGs are biocompatible. On varying temperature, a reversible phase transition of oligo(Phe)-mPEG solutions could be observed. N -octane-in-water emulsions and 0.5% beta-carotene containing squalene-in-water emulsions stabilized by oligo(Phe)-mPEGs occurred at 25 °C but de-emulsification took place at >40 °C. Emulsification could be restored once the separated mixture cooled and re-homogenized. The emulsification/de-emulsification cycling could be repeated many times. The time required for de-emulsification decreased with elevated temperature but increased with a reduced concentration of oligo(Phe)-mPEGs and a reduction in the chain length of the mPEG moiety.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiaozhi Guo,Hongyuan Shang,Jun Guo,Hui Xu,Yukou Du
Constructing efficient catalysts for the electrooxidation of fuels is of vital importance for realizing the commercialization of fuel cells. Unfortunately, most of catalysts (e.g. Pt) suffer from limited activity and poor durability for the electrooxidation of liquid fuel . Also, the drawbacks of extremely high cost and nature scarcity have also severely hindered their large-scale applications. Here, we demonstrated the synthesis of a new class of well-defined and three-dimensional (3D) flower-like nanocatalysts which assembled by ultrafine two-dimensional (2D) alloyed PdCu nanosheets . Structurally, the as-obtained PdCu alloy nanoflowers (NFs) possessed high surface area with abundant surface active sites. Benefiting from the unique structural properties and the strong alloy effect, the as-obtained PdCu NFs can display greatly enhanced performances toward ethylene glycol oxidation reaction (EGOR) with the mass/specific activity of 4714.1 mA mg −1 /13.7 mA cm −2 , which are 4.4 and 6.85 times of Pd/C catalysts, respectively. Most strikingly, such 2D nanosheets-constructed 3D nanoflower-like structure also enables the PdCu catalysts with high long-term stability for EGOR. As a proof of concept, this work not only presents the rational design and construction of catalysts with well-defined structure for the fuel cells reactions but also provides a promising method to largely promote the electrochemical performances of catalysts.
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FLUID PHASE EQUILIBRIA
·
2018
·
IF 2.197
Tao Jia,Shengshan Bi,Jiangtao Wu
The solubilities of carbon dioxide , oxygen, and nitrogen in aqueous ethylene glycol(EG) solution with EG mass fraction 0.365 were measured at temperatures from (263–293) K and pressures from (0.009–0.101) MPa based on an isochoric saturation method. A new experimental setup was built and checked by measuring the solubility of carbon dioxide in water. The expanded uncertainty ( k = 2) of the measured solubility data was estimated to be less than 4.0%. The experimental results of carbon dioxide, oxygen, and nitrogen in aqueous EG solution were successfully correlated with a modified Krichevsky–Kasarnovsky equation. The absolute average deviations of the experimental and fitted values were 5.2%, 3.2%, and 2.6%, respectively.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jia-Kai Wu,Chun-Chun Ye,Wen-Hai Zhang,Nai-Xin Wang,Kueir-Rarn Lee,Quan-Fu An
Dehydration of ethylene glycol (EG), a valued product in chemical industries, was efficiently implemented by pervaporation with a graphene oxide (GO)-incorporated polyelectrolyte complex nanoparticles (PEC NPs) membrane. GO-incorporated PEC NPs with solution processability were prepared through a new strategy of “complex precipitation–redispersion”. The PEC NPs-based membranes were prepared via solution casting, and their structural characteristics and hydrophilic property were investigated systematically. Spherical PEC NPs building blocks increase cavities and thus flux of the membranes, while the tightly associated ion-pair structure coupled with strong interface interactions between regularly-arranged GO nanosheets and PEC matrix led to good separation factor. In detail, the resulted membrane PEC NPM/GO-3 presented a flux of 961 g m −2 h −1 and water in permeate of 99.25 wt% in dehydrating 10.0 wt% water/EG mixtures at 60 °C. Moreover, the PEC NPM/GO-3 showed a tensile strength of 139.1 MPa and higher long-term operation stability, which was important for commercial application.
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