LWT-FOOD SCIENCE AND TECHNOLOGY
·
2018
·
IF 3.129
Yao Zhang,Dandan Li,Na Yang,Zhengyu Jin,Xueming Xu
The aim of this study was to compare effects of linear dextrans (backbones of α-(1 → 6) linkages) varying with weight-average molecular weights (Mw: T10, T70, T250, T750, T2000) on the quality of wheat breads . The firmness of fresh bread crumb was decreased with increasing dextran Mw and the highest Mw dextran (T2000) lowered the staling rate of stored breads. Dough rheology clarified that only the specific dextran (T70) apparently changed dough viscoelastic, strengthening the viscous behavior. Significant decreases in breakdown and setback viscosity of starch slurry were observed by addition of dextrans, especially dextran T2000. Analyses in the long-term retrogradation of starch and starch-gluten systems indicated that the promising antistaling influence of dextran T2000 was caused by either inhibitions of amylopectin retrogradation or beneficial variations induced by gluten. Positive effects of starch-gluten and dextran-gluten associations on amylopectin retrogradation were revealed. These results suggested that the highest Mw dextran (T2000) possessed the potential for increasing consumer acceptance of bread products.
研究领域:
食品科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jiancheng Wang,Zhaoliang Peng,Ying Chen,Weiren Bao,Liping Chang,Gang Feng
Cu-SSZ-13/cordierite monolithic catalyst was prepared by in situ hydrothermal synthesis method. The physicochemical properties of the as-prepared Cu-SSZ-13/cordierite were investigated by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, N 2 -adsorption, inductively coupled plasma, X-ray photoelectron spectroscopy, and solid-state NMR techniques. The removal of nitrogen oxides (NO x ) from simulated diesel vehicle exhaust gas was performed using fixed-bed reactor. The effects of crystallization time and addition of HF during hydrothermal synthesis, reaction space velocity, and aging treatment of catalyst on the catalytic performances of NO x reduction reactions were investigated. The results indicate that the optimum crystallization time was 72 h. Highly crystalline structure of zeolite Cu-SSZ-13 was formed, in a close combination with a carrier, via one step hydrothermal process. Cu-SSZ-13/cordierite showed excellent DeNO x performance for selective catalytic reduction (SCR) and anti-aging properties in a simulated diesel exhaust gas under a high space velocity. At a high space velocity of 72,000 h −1 , the highest conversion and N 2 selectivity of 94% and 90%, respectively, were achieved. After the aging for 50 h at 720 °C, NO x reduction rate was still >80% in the temperature range of 350–550 °C. The larger height to diameter ratio of the same catalysts enhanced the NH 3 -SCR catalytic activity and broadened the active temperature window. The addition of HF increased the catalytic activity and anti-aging performance of the sample.
研究领域:
催化材料
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Zenggang Zhao,Shaopeng Wu,Quantao Liu,Chao Yang,Yingxue Zou,Pei Wan
Asphalt aging seriously decreases the pavement performances and service life of asphalt pavement. Previous studies have indicated that CeO 2 nanoparticles reveal ultraviolet light absorption characteristics. While the function mechanism of CeO 2 nanoparticles to asphalt is still not clear. To further enrich the types of aging-resistant agent and extend the service life of asphalt, the influence of CeO 2 nanoparticles on the aging resistance of asphalt was explored in this paper. The optical characteristics of CeO 2 nanoparticles crystal and layered double hydroxides (LDHs) crystal were analyzed by ultraviolet visible spectrophotometer. CeO 2 nanoparticles modified asphalt and LDHs-modified asphalt were prepared and phase segregation tests were performed to evaluate the compatibility of modified asphalt. Subsequently, brookfield viscometer and dynamic shear rheometer (DSR) were conducted to evaluate the viscosity and rheological properties of virgin asphalt, CeO 2 nanoparticles modified asphalt and LDHs modified asphalt before and after thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) aging. And their functional group characteristics and micromorphology were investigated through fourier transform infrared spectrometer (FTIR) and atomic force microscope (AFM). The results show that CeO 2 nanoparticles mainly absorb ultraviolet light, while LDHs mainly reflects ultraviolet light. The storage stability of CeO 2 nanoparticles modified asphalt is slightly lower than that of LDHs modified asphalt, but the storage stability of the two modified asphalt met the specification requirements. Incorporating CeO 2 nanoparticles to asphalt can augment the viscosity and complex modulus of asphalt and strengthen its anti-aging ability, especially for anti-ultraviolet aging. There is not new absorption peak on the infrared spectrum of CeO 2 nanoparticles modified asphalt binder after the modification, which illustrates that modification of CeO 2 into asphalt is considered to be a physical process. Moreover, LDHs modified asphalt demonstrates superior anti-aging effect than that of CeO 2 nanoparticles modified asphalt. Overall, CeO 2 nanoparticles can also be used as an aging-resistant agent of asphalt.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fenglong Li,Zifa Xu,Han Hu,Zhengyang Kong,Chao Chen,Ying Tian,Wenwu Zhang,Wu Bin Ying,Ruoyu Zhang,Jin Zhu
Two of the very important demands for the elastic matrix of electronic skin (E-skin) are durability and degradability, which ensure the stable performance in daily life and green end of the E-skin. Unfortunately, these two requirements are usually incompatible. Here, we proposed the idea of controlled degradation and synthesized a polyurethane, AL-PU-4, to solve such challenge. High crystalline hydroxy-terminated poly (1,4-butylene adipate) (HTPBA) and low crystalline polycaprolactone diol (PCL diol) were mixed and used as the degradable soft segment. The dynamic disulfide bond was chosen as the chain extender, which could simultaneously endow the polyurethane with anti-aging and self-healing properties. The AL-PU-4 didn’t show significant loss in mechanical and molecular weight after 12 days of accelerated aging experiment, which equaled to 12 months of daily use, and it owned a fast room temperature self-healing speed of 1.31 μm/min. With the steric protection of the hard segment, the degradation of ester bonds in HTPBA and PCL diol segments was seriously retarded under enzymatic and low pH conditions. Only when the pH reached 14, the ‘lock’ on degradation was opened. The above functionalities were also verified in an E-skin demo, which could response the external pressure quickly and show high stability in cyclic test.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Lei Hou,Zhe Wang,Zhaoyu Chen,Wenbo Chen,Cancan Yang
PIM-1 and poly(arylene fluorene ether ketone) (Am-PAFEK) were synthesized by polycondensation . Their structures were characterized by 1 H NMR and FT-IR spectral analyses. A series of flexible and transparent blend membranes were prepared by solution blending with different ratios of PIM-1 and Am-PAFEK. DSC and SEM analyses showed good compatibility between them. PIM-1 and Am-PAFEK in the blend membrane perform their respective functions. The former provides excellent permeability; the latter provides high selectivity for CO 2 . Addition of 20% Am-PAFEK into the blend membrane increased the gas separation selectivity of CO 2 /CH 4 and CO 2 /N 2 by 75% and 65%, respectively. The optimum separation performance was achieved with blend membrane with a CO 2 permeability of 752.4 Barrer and a CO 2 /N 2 selectivity ratio of 26.7, extremely close to the Robeson upper bound (2008). After 140-days aging test, the blend membranes still maintained above 70% CO 2 permeability, indicating that it has good antiaging properties. Consequently, the new type of membranes have great potential in industrial applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 13
·6108-6119
·
IF 3.591
Siyi Li,Xuehui Zhao,Hongwei Zhang
It is very important to reduce the oxidation of free radicals in organic membrane materials for the stability and safety of drinking water production treatment processes. This paper presents a new method for the qualitative and quantitative determination of free radicals in sodium hypochlorite solution by electron spin resonance (ESR) and salicylic acid spectrophotometry. Experiments show that the free radical scavenging rate reaches over 86% after the addition of 0.5 wt% nano-particles. PVDF–PVP/TiO2 and PVDF–PVP/CNT modified membranes are prepared by blending polyvinylidene fluoride (PVDF) with nano titanium dioxide (nano-TiO2) and carboxyl-modified multi-wall carbon nanotubes (MWCNTs-COOH), and are treated in 2000 ppm sodium hypochlorite solution for 30 days. Through surface chemistry (FTIR, XRD), surface morphology (SEM), surface hydrophilicity (contact angle), surface electronegative (zeta potential) and mechanical properties tests, the changes of membrane properties are analyzed during aging. The experimental results show that the nano-particles have a quenching effect on free radicals and inhibit defluorination. It has been proved that under the action of nano-additives, the erosion of free radicals on the membrane material is reduced, the aging rate of the membrane material is decreased, and the chemical stability of the membrane material is improved. In this paper, the reason and mechanism of anti-aging of the nano-particle modified membrane are analyzed, which provides theoretical support for future membrane cleaning technology and prolonging the service life of the membrane.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
REVIEWS ON ADVANCED MATERIALS SCIENCE
·
2024
·Vol. 63
·期 1
·
IF 3.6
Chuangmin Li,Lubiao Liu,Youwei Gan,Qinhao Deng,Shuaibing Yi
This research focuses on the aging resistance properties of asphalt, which are crucial for determining the lifespan of asphalt pavement. To combat aging, waste tire pyrolysis oil (TPO) is often added to asphalt, enhancing its resistance to aging but compromising high-temperature performance. This study offered a pioneering solution by integrating TPO with polyphosphoric acid (PPA) to address these issues. In this study, we conducted a series of tests to characterize the properties of PPA/TPO modified asphalt, including temperature sweep and bending beam rheometer tests. The results demonstrated that the presence of PPA in the PPA/TPO modified asphalt could improve its high-temperature performance while maintaining its low-temperature properties. Moreover, PPA in the PPA/TPO modified asphalt enhanced the modified asphalt’s resistance to fatigue and deformation during the aging process, while the presence of TPO effectively reduced the impact of thermo-oxidative aging on the modified asphalt during the aging process. Additionally, physicochemical interactions between the base asphalt and modifiers were observed before and after aging. In summary, this study had offered an innovative method to enhance the anti-aging properties of asphalt, and had provided more options for sustainable, environmentally friendly roads.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Jiatao Zhang,Tungalag Dong,Yuan Zhang,Jia Guo,Yulu Li,Xueyan Yun
Although poly(L-lactic acid) (PLLA) is biocompatible and degradable, its inherent brittleness, susceptibility to aging, low ultraviolet light (UV) resistance, and moderate gas barrier properties limit its diverse applications. In this study, graphene oxide (GO) was used as an initiator, unsaturated poly (butylene itaconate) (PBI) was used as a flexible chain segment, and GO-grafted P(LA- g -BI) (GO- g -PLBI) copolymer was synthesized by in situ melt polycondensation of lactic acid. Nuclear magnetic resonance, Fourier transform infrared, and X-ray photoelectron spectroscopy results confirmed the successful synthesis of GO-g-PLBI and the formation of a multi-branched structure. The GO- g -PLBI film demonstrated excellent ductility and oxygen barrier properties, with elongation at break increased by 73.8 times compared with PLLA, while oxygen permeability (OP) decreased by 40.3%. The incorporation of PBI facilitated micro-crosslinking within the copolymer, thereby enhancing its thermal stability. More gg and gt conformations were formed in the copolymer, while the crystallization of the copolymer induced by aging was inhibited, thus showing excellent anti-aging properties. Interestingly, the OP value of this micro-crosslinked GO-g-PLBI film decreased by 60.9% after physical aging, demonstrating extremely high oxygen barrier properties. This study offers a viable approach to developing PLLA/graphene nanocomposites that exhibit adjustable flexibility, enhanced oxygen barrier, heat and UV resistance, anti-aging properties, and high transparency. Graphical
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinya Lou,Huamin Liu,Peiyan Li,Jicai Liang,Ce Liang
A new type of filler was added to epoxy resin to prepare a composite coating with excellent corrosion and weathering resistance. The simple synthesis process and nonpolluting raw materials of this filler contribute to the development of green chemistry. Specifically, lignin was encapsulated in mesoporous silica, the synergistic effect between the two resulted in the formation of lignin/mesoporous silica composite particles (MSN-L) with excellent ultraviolet (UV) resistance. Moreover, MSN-L was incorporated into the epoxy coating to form an excellent barrier against the penetration of corrosive media. The coating was characterized using electrochemical impedance spectroscopy (EIS), contact angle analysis (WCA), confocal laser scanning microscopy (CLSM) and other testing methods. The results show that the epoxy coating doped with 2 wt% MSN-L exhibits good corrosion resistance and excellent surface stability before and after the accelerated aging experiments. The impedance value of the coating was 10 6 Ω•cm 2 and the corrosion current was 10 −4 mA/cm 2 . After UV aging, the surface roughness was 71.3 % lower and the degree of reduction in the water contact angle was reduced by 61.2 % compared to the blank coating. This corrosion and weather-resistant coating significantly extends the service life of outdoor coatings and provides effective protection for metals used outdoors.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Weihao Ye,Jiemin Qiu,Zhiqiang Xu,Congcong Chen,Guangqi Hu,Chaofan Hu,Jianle Zhuang,Wei Li,Xuejie Zhang,Bingfu Lei,Yingliang Liu
Ultraviolet (UV) absorbents are widely used in coatings and polymers owing to their remarkable absorbance of UV irradiation. As a new type of organic UV absorbent, carbon dots (CDs) have presented outstanding UV absorption properties. However, the use of water-soluble reactants in the synthesis process of most CDs makes them easy to dissolve in water, which is not conducive to their use in the field of thin films. In this paper, we report an effective hydrothermal method to prepare three-component carbon dots (Im-CDs) from sodium citrate, ethylenediamine, and imidazole and then modify the surface to obtain the final product (AOT-CDs) by docusate sodium. The AOT-CDs exhibited a strong UV absorption capacity to UVA and UVB but a transmittance in the visible region both in solution and in polymers. In addition, docusate sodium is regarded as a suitable surface modifier to transfer Im-CDs from water to various organic solvents. When the excellent oil-soluble AOT-CDs are applied to a polyethylene film, the properties of the films, including the efficiency of UV shielding, mechanical property, and aging time, can be effectively tuned by changing the concentration of AOT-CDs. Our full-band UV-shielding films with CDs show no obvious degradation in the process of accelerated UV aging for dozens of days. Due to their ecofriendliness and good chemical and thermal stability in films, AOT-CDs are expected to become competitive candidates for next-generation UV absorbents.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 45
·e54644
·
IF 3
Liang Yi,Longxiadi Zhou,Long Yan,Zhisheng Xu
To enhance the flame retardancy and aging resistance of grouting fireproof glass, different molecular weights of polyethylene glycol (PEG) were mixed with acrylamide (AM) to construct interpenetrating network hydrogels, then the obtained hydrogels were mixed with flame retardants to prepare a series of transparent flame-retarded hydrogels applied in the fireproof glass. The effects of PAM/PEG hydrogel with varying PEG molecular weight on the optical transparency, heat insulation and aging resistance of fireproof glass were investigated. Optical transparency analysis shows that the light transmittance of grouting fireproof glass decreases with the increase of PEG molecular weight in the PAM/PEG interpenetrating network. Fire tests show that PAM/PEG hydrogel significantly enhances the heat insulation and aging resistance of the grouting fireproof glass compared to the single PAM network hydrogel. The flame-retarded and anti-aging effects of PAM/PEG hydrogel in the fireproof glass varies with the PEG molecular weight, and the order is PAM/PEG2000 > PAM/PEG1500 > PAM/PEG1000 > PAM/PEG800. Accelerated aging test shows that PAM/PEG interpenetrating network hydrogel is less affected by aging conditions and exerts durable heat insulation and transmittance. Especially, the backside temperature of 3600 s and transmittance of PAM/PEG2000 system after 264 h aging test only changed 38.3°C and 1.3%, respectively, compared to the unaged PAM/PEG2000 system.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2025
·Vol. 13
·期 20
·5762-5768
·
IF 5.7
Chen Dong,Zijian Li,Hong Bi,Changyong Gao,Xuehua Ma
The aging of poly(vinyl chloride) (PVC) films, driven predominantly by ultraviolet (UV) radiation and environmental factors, restricts their long-term utility. This study explores the incorporation of wide-spectrum-absorbing carbon dots (CDs) as an innovative additive to enhance the anti-aging properties of PVC films. The CDs were synthesized from Garcinia mangostana rind through an environmentally friendly solvothermal method. The resulting CDs exhibit robust light absorption across a broad spectral range, efficiently mitigating harmful UV effects. Innovatively, PVC films embedded with CDs demonstrated notable improvements in photostability under prolonged light exposure. Furthermore, beyond leveraging the specific optical properties of CDs, the construction of an interfacial cross-linking structure is crucial for achieving high mechanical strength in the films. The resulting CDs-embedded PVC composite film demonstrates good mechanical properties, with tensile strength increasing from 47.2 MPa to 101.1 MPa and elongation at break increasing from 39.9% to 237.8%. These findings suggest that wide-spectrum-absorbing CDs hold significant promise for extending the durability of PVC films, particularly in applications exposed to prolonged sunlight, such as food packaging.
研究领域:
材料科学
·
环境科学
✓ 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）