SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
·
IF 6.9
Xuefeng Shao,Yeke Chenxu,Binrui Wang,Nan Zhang,Yanping Yuan
Towards latent heat storage for days, or even extending to months in the context of solar energy utilization, the exploration of phase change materials (PCMs) with stable supercooling and the following crystallization triggering are carried out. The present work confirmed the persistent supercooling property of the xylitol/erythritol eutectic mixture. The coupled technique combining mechanical agitation with seeding was proposed to trigger crystallization, so as to facilitate the heat retrieval whenever heat is in demand. The xylitol/erythritol eutectic keeps supercooling state without crystallization at ambient temperature for at least 10 days, thus it can serve as applicable PCM for controllable heat retrieval. Such severe supercooling is mainly attributed to the particular molecular structure of polyalcohols and dramatic increase of dynamic viscosity . In particular, on the basis of secondary nucleation principle, the coupled technique combining mechanical agitation and seeding can be a preferable technique to efficiently trigger crystallization of the present eutectic PCM , so as to realize controllable heat retrieval. Such combined technique has main advantages of high efficiency and reproducible crystallization process . The agitation duration is shortened to 1.8 min with seeding, in comparison to a longer value of 43.3 min without seeding. Although the single technique of mechanical agitation can also trigger the crystallization, the agitation is found to be time-consuming and the triggered crystallization process is in poor consistency among parallel specimens. Furthermore, the crystallization initiating is greatly advanced with high agitation rate (300 r/min), and the agitation duration to sufficiently activate crystallization can be significantly shortened. The results suggest that appropriately high agitation rate favors the efficient heat retrieval. The obtained results are helpful to gain a better understanding on the supercooled PCMs based controllable heat retrieval.
研究领域:
材料科学
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热能存储
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物理化学
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能源材料
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传热学
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DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Tongtong Zhang,Jihuai Tan,Xue Han,Qinghe Fu,Muhua Chen,Yong Xu,Xinbao Zhu
Families of bio-based hyperbranched epoxy (HBPEEs) were successfully prepared using renewable xylitol, bisphenol A and epichlorohydrin as feedstocks. The structure and physical performances of HBPEEs were characterized by FTIR, NMR, GPC and viscosity evaluation. Then, they were used as high efficient tougheners for diglycidyl of bisphenol A/diethylenetriamine (DGEBA/DETA) networks. The results indicated that the incorporation of HBPEEs into the DGEBA system can significantly enhance the mechanical properties and solvent resistance properties of the hybrid (HBPEEs/DGEBA). In particular, toughened hybrids with 15 wt% HBPEE-2 exhibited the outstanding impact strength than that of neat DGEBA (37.4 kJ/m 2 vs. 11.8 kJ/m 2 ) due to its excellent compatibility of with DGEBA. Simultaneously, the ductile fracture morphology of the modified hybrids was also confirmed by SEM. In addition, the activation energies of HBPEE-2/DGEBA hybrids calculated from the non-isothermal curing kinetics were lower than that of neat DGEBA. All of the results suggested that the bio-based HBPEEs could be used as efficient tougheners applied in epoxy resins industry.
研究领域:
高分子化学
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材料科学
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绿色化学
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复合材料
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聚合物改性
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2019
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IF 2.961
Ziqi Zhu,Pei Yang,Minzhi Chen,Tao Zhang,Yizhong Cao,Wei Zhang,Xiaoyan Zhou,Weimin Chen
Carbon dots (CDs) have sparked tremendous attention owing to their unique properties and great potential in various fields. Herein, novel amphiphilic CDs (ACDs) were synthesized solvothermally by microwave heating a mixture of xylose and ethylenediamine in N, N-dimethylacetamide. The xylose-derived ACDs were monodisperse nanoparticles with an average diameter of about 1.81 nm, and exhibited excitation-dependent emission behavior in both aqueous and several common organic solvents . Furthermore, the synthesized ACDs can be uniformly dispersed into polyvinyl alcohol (PVA) solution to fabricate transparent luminescent composites, the as-prepared PVA/ACDs composites not only exhibited excellent fluorescence with excitation-dependent emission performance, but also achieved water-induced shape memory behavior. The intrinsic reason and pH sensitivity of shape recovery were investigated, the results confirmed that a faster shape recovery can be obtained in water at pH 4 within 180 s. Further investigation illustrated that the sensitivity of additional hydrogen bonding between PVA and ACDs to the water molecular was highly related to the shape recovery of the luminescent composite. The green synthesis route for xylan-derived ACDs and fabrication of smart luminescent composite will open many possibilities for the valuable application of low-cost biomass.
研究领域:
纳米材料学
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高分子科学
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生物医学工程
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功能材料
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绿色化学
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智能材料
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2023
·Vol. 33
·期 7
·2000-2012
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IF 4
Gao Die,Zhu Qingqing,Liu Peng,Zhou Qing,Cheng Xiujie,Liu Li,Xu Junli,Lu Xingmei
Proton-type ionic liquids have been proved to be promising for the pretreatment of lignocellulosic biomass, because they can provide high yield cellulase hydrolysis and high lignin removal rate. In this work, three proton-type ionic liquids, ethyl methanesulfonamide (EAM), ethyl amine nitrate (EAN) and ethyl amine acetate (EAN[OAc]), were successfully synthesized to pretreat corn straw, and five sugar platform organic solvents were selected as co-solvents for biomass pretreatment. The experimental results showed that under the optimal pretreatment conditions (10 wt% EAM, 130 °C, 2 h, 7 wt% straw loading in PDO solvent), the delignification rate of corn straw could reach 96 wt%, the sugar yield of cellulose-rich substrate could reach 95 wt% in 96 h, the regeneration rate of lignin dissolved in the solvent was 86 wt%, and the remainder of the solvent was small molecular compound, the hemicellulose dissolved in the solvent is degraded to monomolecular sugars (xylose and arabinose). The XRD, SEM characterization data and spectrograms of cellulosic substrate also fully proved that the lignin was successfully dissolved and separated from corn straw by pretreatment of composite system, and in the remaining straw the content and crystallinity of cellulose was improved. In this paper, density functional theory (DFT) is used to explore the pretreatment principle. From the optimized structure, it can be seen that the interaction energy between the ionic liquid cosolvent system and lignin is higher than that in the pure ionic liquid system. The simulation results, experimental analysis and characterization can effectively explain the essence of the system for efficient straw pretreatment, and the system can provide new ideas for the development of biomass pretreatment.
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DOI
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Jian Han,Feng Han,Jiaqing Wang,Yang Wei,Boris N. Kuznetsov,Yong Xu
Oxygen supply is one of the decisive factors of obligate aerobic microbial fermentation. Gluconobacter oxydans as a typical aerobic bacterium has excellent whole-cell catalysis and bio-oxidation ability to sugars and alcohols. By the dual function of oxygenation and alkali production of sodium percarbonate (SPC), the dissolved oxygen supply and pH stabilization was experimentally investigated and applied for the first time in G. oxydans fermentation. SPC performed a significant assisting effort to bio-oxidation performance by the in-situ oxygen supply and neutralization for whole-cell catalysis and bio-oxidation of lignocellulosic xylose , glucose, and glycerol. Compared with common aeration fermentation (and even the sealed pure-oxygen supplied mode), the bio-production of the three platform compounds xylonic acid, gluconic acid , and 1, 3-dihydroxyacetone was improved significantly by 45.7%, 28.4%, and 39.1%, respectively. In addition, the direct bioproduction of xylonic acid from the crude corncob sulfate hydrolysate was also improved by 17.3%. Within 4 h, 37.7 g/L of xylonic acid was produced in the fermentation tank, with a productivity of 9.4 g/L/h. The in-situ SPC assistance provides a simple and practical approach to intensify the bio-oxidation performance of G. oxydans for the whole-cell catalysis of high-value-added platform compounds from lignocellulosic feedstocks .
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Foods
·
2023
·Vol. 12
·期 8
·1590
·
IF 5.2
Yaxian Chen,Yini Cai,Zhimin Zhao,Depo Yang,Xinjun Xu
In this study, the hot water extraction process of crude polysaccharides from Morindae officinalis radix (cMORP) was conducted and optimized through a single-factor test and orthogonal experimental design. With the optimal extraction process (extraction temperature of 80 °C, extraction time of 2 h, liquid/solid ratio of 15 mL/g, and number of extraction of 1), the cMORP was obtained by the ethanol precipitation method. The chemical properties and preliminary characterization of the cMORP were analyzed by chemical or instrumental methods. Furthermore, to indicate a preliminary study on safety, a single oral dose of 5000 mg/kg body weight (BW) was administered orally to Kunming (KM) mice for acute toxicity, and the cMORP was administered orally to KM mice once a day at doses of 25, 50, and 100 mg/kg BW for 30 days. General behaviors, body weight variations, histopathology, relative organ weights, and hematological and serum biochemical parameters were observed and recorded. The results suggested there were no toxicologically significant changes. Based on the safety study, cMORP can be initially considered non-toxic with no acute oral toxicity up to 5000 mg/kg BW and safe at up to 100 mg/kg BW in KM mice for 30 days.Keywords:Morindae officinalis radix;crude polysaccharides;hot water extraction;optimization;preliminary characterization;safety study
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2023
·
IF 11.4
Meixin Wang,Yawei Zhan,Jiayue Zhao,Zhiqiang Li
Bamboo and its mechanical processing residues have broad prospects for high value-added utilization. In this research, p-toluenesulfonic acid was used for the pretreatment of bamboo to investigate the effects of extraction and depolymerization of hemicellulose. The response and behavior of changes of cell-wall chemical components were investigated after different solvent concentration, time, and temperature pretreatment. Results indicated that the maximum extraction yield of hemicellulose was 95.16 % with 5 % p-toluenesulfonic acid at 140 °C for 30 min. The depolymerized components of hemicellulose in the filtrate were mainly xylose and xylooligosaccharide, with xylobiose accounting for 30.77 %. The extraction of xylose from the filtrate reached a maximum of 90.16 % with 5 % p-toluenesulfonic acid at 150 °C for 30 min pretreatment. This research provided a potential strategy for the industrial production of xylose and xylooligosaccharide from bamboo and for the future conversion and utilization.
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DOI
PubMed
高影响因子
Food Bioscience
·
2023
·
IF 5.2
Qianwei Ma,Yang Yu,Zhongkai Zhou,Lili Wang,Ruge Cao
To take better advantage of the soluble dietary fibers (SDF) of buckwheat bran, different treatments including extrusion, steam explosion, microwave, roasting , superheated steam, ultrasound and enzymolysis were applied to buckwheat bran, and the monosaccharide compositions, structural, physicochemical and biological properties of SDF were estimated. Except enzymolysis treatment, all the other treatments have significantly increased ( p < 0.05) the content of SDF in buckwheat bran. Compared to natural SDF, the SDF in treated buckwheat bran showed porous and wrinkled surface, lower crystallinity, increased thermal stability and better rheological and hydration properties. These treatments have significantly improved the glucose adsorption capacity, nitrite ion adsorption capacity, antioxidant and antibacterial properties of SDF of buckwheat bran, among which extrusion showed the best effect. The microstructure, molecular size, monosaccharide and bound phenolics composition of SDF in buckwheat bran were effectively modified by appropriate treatments, with preferable physicochemical and biological properties.
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高影响因子
BIOMASS & BIOENERGY
·
2023
·
IF 6
Lihe Zhu,Xueting Shao,Xuejun Pan,Zhong Sun,Xiangyu Li,Xixin Duan,Junyou Shi
Catalytic conversion of waste biomass to furfural (FF) is an important valorization of lignocellulose . Heteropolyacid catalysts were designed for efficient aqueous-phase dehydration of saccharides by supporting phosphotungstic acid (H 3 PW 12 O 40 , abbreviated as PW 12 ) on H-ZSM-5 zeolite at different loadings (xPW 12 /ZSM-5, x = 10%, 20%, 30%, 40%, 50%). The PW 12 /ZSM-5 was used in the one-pot conversion of biomass (xylose, xylan , and corn stover) to FF in LiBr aqueous solution. The low PW 12 loading catalyst (10%PW 12 /ZSM-5) could efficiently convert biomass to FF with the yields of 73.3% (xylose) and 75.1% (xylan) at moderate temperature (130 °C), respectively. The PW 12 loading and acid sites distribution were crucial to the catalytic performance. Moreover, LiBr enhanced the yield of FF because of its Lewis acidity. The PW 12 /ZSM-5 based solid polyacid was a promising catalyst for the efficient FF production from biomass with high yield and easy separation.
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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Xueliang Zhang,Gisele LaPointe,Yang Liu,Xiaomeng Wang,Luyao Xiao,Xiaogan Zhao,Wei Li
In this study, we evaluated the impact of Lactiplantibacillus plantarum ( L. plantarum ) with ropy and non-ropy phenotypes on gel structure and protein conformation of fermented milk. Ropy L. plantarum (T1 & CL80) secreted EPS with high molecular weight (1.41 × 10 6 , 1.19 × 10 6 Da) and intrinsic viscosity (486.46, 316.32 mL/g), effectively enhances fermented milk viscosity and water holding capacity (WHC) (65.4%, 84.6%) by forming a dense gel structure. Non-ropy L. plantarum (CSK & S-1A) fermented milk gel’s high surface hydrophobicity and free sulfhydryl content caused high hardness and low WHC. Raman spectroscopy combined with circular dichroism analysis showed that high levels of α-helix (29.32–30.31%) and random roil (23.06–25.36%) protein structures are the intrinsic factors that contribute to the difference among fermented milk gels of ropy and non-ropy strains. This study provides a basis for understanding the structural variability of fermented milk gels using ropy or non-ropy lactic acid bacteria.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Mengxing Zhao,Xingye An,Zhongqiu Fan,Shuangxi Nie,Zhengbai Cheng,Haibing Cao,Xiaohong Zhang,Md Manik Mian,Hongbin Liu,Liqin Liu
Tobacco based cellulose nanofiber (TCNF) is a novel nanocellulose that has recently been used to replace undesirable wood pulp fibers in the preparation of reconstructed tobacco sheets (RTS). However, given the strict requirements for controlling toxic chemical content in tobacco products, there is a global interest in developing a green, efficient, and toxic-chemical free approach to isolate TCNF from tobacco stem as a bioresource. In this study, we propose a creative and environmentally friendly method to efficiently and safely isolate TCNF from tobacco stem pulp, which involves integrated biological pretreatment followed by a facile mechanical defibrillation process. Feruloyl esterase is used to pretreat the stem pulp by disrupting the ether and ester bonds between lignin and polysaccharide carbohydrates within the fiber wall, which effectively facilitates cellulase hydrolysis and swelling of the stem pulp fiber, as well as the following mechanical shearing treatment for TCNF isolation. The results demonstrate that TCNF obtained by the comprehensive feruloyl esterase/cellulase/mechanical process exhibit uniform and well-dispersed nanofiber morphology, higher crystallinity , and stronger mechanical properties than those of the control. The addition of 0.5 % TCNF can replace wood pulp by 18 wt% ~ 25 wt% in the production of RTS samples while maintaining their reasonable strength properties.
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PubMed
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhenzhen Guo,Jinwen Zhu,Jian Yin,Peng Miao
In this study, a novel fluorescent biosensor is developed for the detection of H 2 O 2 and glucose based on Zeolitic Imidazolate Framework-8 (ZIF-8) nanocomposites. ZIF-8 encapsulating carbon nanodot (CD) exhibits bright fluorescence emission. After further loading of AgNP, the fluorescence is quenched, which is mainly based on the excited electron transfer from CD to AgNP. Besides, the excitation wavelength of CD falls within the adsorption range of AgNP, which leads to efficient inhibition of the excitation energy. The as-prepared AgNP-CD-ZIF-8 nanocomposites can be utilized as a highly sensitive platform for the analysis of H 2 O 2 and glucose. In the presence of glucose, H 2 O 2 can be generated by the catalysis of glucose oxidase (GOD), which induces the etching of AgNP and subsequent recovery of CD-ZIF-8 fluorescence. This “turn on” biosensor can be applied for facile and convenient quantification of H 2 O 2 . It can also be further extended to detect glucose in real samples after combining specific catalytic effect of GOD. The analytical performances are excellent, which demonstrates great potential for practical utility.
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PubMed
高影响因子
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