POLYMER
·
2025
·
IF 4.5
Yi Chen,Xuan Wang,Hongyang Ma,Shyam Venkateswaran,Benjamin S. Hsiao
Chiral electrospun fibrous membranes with nanoscale fiber diameter were fabricated from synthetic polymers, poly(L-(-)-menthyl methacrylate) and poly(D-(+)-menthyl methacrylate), respectively, and employed as chiral filters for highly selective separation of chiral compounds. The structure and morphology of chiral nanofibrous membranes were controlled by adjusting the molecular weight of the polymer, the solution concentration, and the composition of solvents, verified with SEM measurements. To enhance the mechanical properties of a chiral nanofibrous membrane, polyacrylonitrile (PAN) was employed as second nanofibrous component serving as a skeleton, where a chiral nanofibrous composite membrane was fabricated through a two-nozzle electrospinning approach. Chiral compounds (S)-(-)-α- and (R)-(+)-α-phenethylamine were employed to challenge the separation efficiency of PAN/L-PMnMA and PAN/D-PMnMA nanofibrous composite membranes, in terms of the selective adsorption capability, while high selective factor was achieved for chiral isomers, implying that the chiral nanofibrous composite membrane could be potentially used for the chiral separation of natural products.
研究领域:
材料科学
·
高分子科学
·
分析化学
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纳米技术
·
分离科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Ai-Rong Xu,Shuan Wen,Lin Chen
Novel cellulose solvents, MIM-[N 4444 ][CH 3 CH 2 COO], were developed by coupling N -methylimidazole (MIM) with tetrabutyl ammonium propionate ([N 4444 ][CH 3 CH 2 COO]). The solubilities of cellulose in MIM-[N 4444 ][CH 3 CH 2 COO] solvents were determined at 25 °C. The effect of MIM content on cellulose solubility and the possible dissolution mechanism of cellulose in MIM-[N 4444 ][CH 3 CH 2 COO] solvent have been investigated. It was found that [CH 3 CH 2 COO] − anion in MIM-[N 4444 ][CH 3 CH 2 COO] solvent is the main driving force of the cellulose dissolution by interacting with the hydroxyl hydrogen atom in cellulose, and the role of MIM is mainly to disassociate/dilute [N 4444 ][CH 3 CH 2 COO]. In addition, the morphology and structure of the regenerated cellulose materials from MIM-[N 4444 ][CH 3 CH 2 COO] solvent were characterized by scanning electron micrograph (SEM), Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD).
研究领域:
材料科学
·
化学工程
·
高分子科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9057-9064
·
IF 2.22
Zhao Jingkui,Liu Xiansong,Kan Xucai,Chen Zuhua,Liu Chaocheng,Wang Wei,Lv Qingrong,Huang Jingwen,Shazeda Mudssir
In this study, novel Ni–Cu–Zn ferrites with the chemical formula [Ni 0.6 Zn 0.4 ][Cu 0.2 Co x Fe 1.8− x ]O 4 ( x = 0, 0.05, 0.10, 0.15, 0.20, 0.25) doped with Co 2+ ions were designed and manufactured by standard solid-state reaction method. The magnetic properties, surface characteristics, and ion occupancy of ferrites were studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM), and we explained the different mechanisms of the results and the relationship between magnetic properties and microstructures. For the obtained samples, cobalt ions entered the lattice, and all samples were characterized as spinel structures. As the doping amount of Co 2+ ions increases, the lattice constant and volume of the sample also increases. With an appropriate doping level, Co 2+ ions-doped Ni–Cu–Zn ferrites can maintain higher saturation magnetization, higher magnetic permeability, and lower hysteresis loss. When x ≤ 0.1, the saturation magnetization M s increases significantly as the doping amount of Co 2+ ions increases, but when x > 0.1, the value decreases. The experimental results show that the saturation magnetization value is 118.08 emu/g, the magnetic permeability value is 39.47 H/m, and the hysteresis loss is 1.192 mW/cm 3 at an optimum doping amount. Therefore, the sample achieves the best magnetic properties when the doping amount is 0.1.
研究领域:
材料科学
·
磁学
·
陶瓷学
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纳米技术
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产品关联
DOI
高影响因子
E-POLYMERS
·
2017
·Vol. 17
·期 6
·463-470
·
IF 0.949
Yongqian Nie,Xuanxi Leng,Yixue Jiang,Shigan Chai,Jinzhi Zhang,Qichao Zou
Unsaturated polyester resins (UPR) were prepared by the melt condensation method based on adipic acid, o-phthalic anhydride, maleic anhydride and ethylene glycol in the presence of PSS-(2,3-propanediol)propoxy-heptaisobutyl substituted (PSS-POSS) or/and 9 wt% [(6-oxide-6H-dibenz(c,e)(1,2)oxaphosphorin-6-yl)methyl]butanedioic (DDP). We synthesized UPR containing DDP (DDP-UPR) and UPR containing both DDP and PSS-POSS (DDP-PSS-POSS-UPR series). The chemical structures of the modified polyesters were characterized and confirmed by Fourier transform infrared (FTIR) and 31 P nuclear magnetic resonance ( 31 P NMR). The thermal stability and flammability behaviors of UPR were evaluated by thermogravimetric analysis (TGA) and limited oxygen index (LOI) and the vertical burning test. The morphology of residual char of UPR was shown by scanning electron microscopy (SEM). The results indicate that the incorporation of PSS-POSS has little influence on the thermal stability of DDP-UPR, but enhances the flame retardance of DDP-UPR, and when the PSS-POSS content reaches 10 wt%, the DDP-PSS-POSS-UPR has better flame retardance.
研究领域:
材料科学
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聚合物化学
·
消防安全工程
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产品关联
DOI
高影响因子
HIGH TEMPERATURE MATERIALS AND PROCESSES
·
2021
·Vol. 40
·期 1
·389-396
·
IF 0.826
Yingwei Xu,Tingting Zhang,Li Zheng,Ailing Zou
KBaPO 4 :Eu 2+ /Sm 3+ phosphor was synthesized via the high-temperature solid-phase reaction method. The structural properties, surface morphology, and optical properties of the synthesized samples were obtained by the X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and fluorescence measurements. The XRD patterns indicate that the crystal structure of KBaPO 4 has not been changed by co-doped with two rare-earth ions. Under the excitation of 400 nm, the Eu 2+ and Sm 3+ co-doped KBaPO 4 phosphors showed typical emission peaks at 430 (blue), 562 (yellow), and 600 nm (red). Meanwhile, with the increase of the Sm 3+ content, the photoluminescent (PL) emission intensity of Sm 3+ increased until the content reaches 0.12. However, the PL intensity of Eu 2+ ions gradually decreased, which indicated that there was a possible energy transfer between the two ions. Therefore, the obtained results indicated that Eu 2+ /Sm 3+ co-doped KBaPO 4 is a promising phosphor for the use in white light-emitting diodes with near ultraviolet chips.
研究领域:
材料科学
·
光电技术
·
固体物理
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产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Shang Wu,Yang Yang,Tingwei Wang,Jiadi Sun,Yinzhi Zhang,Jian Ji,Xiulan Sun
Antibiotic resistance in Salmonella enterica serovar Typhimurium ( S . ser. Typhimurium) has become a critical safety hazard in food. Sublethal environmental stresses can influence resistance in Salmonella during food processing. This study simulated environmental stresses in food processing. The antibiotic resistance of three strains of S . ser. Typhimurium (the ATCC 14028 strain and two wild-type isolates from chicken and pork product processing) was evaluated under different pH levels (5.0, 5.5, 6.0, 8.0, and 9.0). Also, dynamic changes in resistance with treatment duration under cold (4 °C, −20 °C) and heat (55 °C) treatment were studied. The results showed that acid and alkaline stresses reduced the resistance of S. ser. Typhimurium to eight antibiotics; meanwhile, the resistance of meropenem (MERO) increased. The minimal inhibitory concentration (MIC) of MERO was increased 16- to 64-fold. With acid or alkaline stress, the extracellular ATP content increased, and the scanning electron microscopy (SEM) result clearly revealed the appearance of wrinkles and holes on the outer membrane of Salmonella . These observations imply changes in membrane permeability, which may decrease the antibiotic resistance of Salmonella . Cold or heat stress increased the resistance of S . ser. Typhimurium to tetracycline, cefotaxime, ceftazidime, nalidixic acid, azithromycin, and ampicillin; the MIC increased 2- to 4-fold. The antibiotic resistance only changed when cold and heat stresses occurred over a certain period of time and remained unchanged when the stress persisted. This study reports on the ability of S. ser. Typhimurium to develop antibiotic resistance after environmental stresses. It can provide valuable information for meat processing to improve interventions and risk management.
研究领域:
微生物学
·
食品科学
·
抗菌素耐药性
·
环境压力
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产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2018
·
IF 2.826
Ding Chen,Peng-fei Feng,Fu-hua Wei
Fe-based metal-organic frameworks(Fe(III)-MOFs)were synthesized by Fe 2 (SO 4 ) 3 and trimesic acid using microwave-assisted ball milling method. The structure of the Fe(III)-MOFs was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The thermostability of the MOFs was analyzed by thermogravimetric analysis (TGA). Fe(III)-MOFs were added in aqueous solutions to remove organic dyes. The removal efficiencies of Orange II, CR and MB reached 95.9%, 98.7%, 95.7% respectively at 10℃ and reached 97.7%, 99.7%, 97.5% respectively at 35℃ in 300 min.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Jie Chen,Cheng Peng,Jun Nie,John F. Kennedy,Guiping Ma
The hyaluronic acid (HA) fibers scaffold with an extracellular matrix mimic structure has been prepared via lyophilization. The morphology of the HA fibers varying the concentration from 0.05 wt% to 0.15 wt% was characterized by scanning electron microscope (SEM). The diameter of HA fibers increased and the morphology changed from fiber to sheet-like structure as the concentration of HA solution increased. To enhance the water-resistance, the pure HA fiber membranes were chemical cross-linked by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC), and confirmed by fourier transform infrared (FT-IR) spectra. In vitro degradation behavior of cross-linked HA fiber membranes in both of water and PBS solutions was investigated, the physical properties were also studied by differential scanning calorimetry (DSC) and thermogravimetry (TG). The results showed that the bonding water capacity increased after crosslinking, and indicated that the crosslinked HA fibers could be used as scaffold in tissue engineering.
研究领域:
材料科学
·
生物医学工程
·
组织工程
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产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Junbo Chu,Songyi Lin,Yuxin Xie,Lin Ma,Simin Zhang
Fried oysters are a traditional dish in coastal regions; however, concerns have been raised regarding the potential nutritional loss drawbacks due to the high temperatures in the frying process, which can lead to oil oxidation. This study investigates the effects of soybean dietary fiber (SDF) and citrus dietary fiber (CDF) at supplemental levels of 0.5 %, 1 %, 2 %, and 4 % on the overall quality of fried oysters. The findings indicate that compared with the control group without dietary fiber, the addition of dietary fibers effectively reduced oil absorption and improved nutritional quality. At a 2 % concentration, SDF and CDF significantly decreased thiobarbituric acid reactive substances (TBARs) by 24.24 % and 15.59 % and peroxide value (POV) by 38.30 % and 31.24 %, respectively, while also inhibiting lipid penetration. Further analysis through molecular docking simulations, viscosity measurements, and scanning electron microscopy (SEM) revealed that dietary fibers bind to the batter, forming a protective mechanical barrier around the oysters. This research endeavor seeks to provide a theoretical basis for improving the quality of fried oysters.
研究领域:
食品科学
·
营养学
·
食品化学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1534
·
IF 4.2
Zhizhi Chen,Lei Wang,Dongxia He,Qi Liu,Qinqin Han,Jinyang Zhang,A-Mei Zhang,Yuzhu Song
Antibiotic resistance has emerged as a grave threat to global public health, leading to an increasing number of treatment failures. Antimicrobial peptides (AMPs) are widely regarded as potential substitutes for traditional antibiotics since they are less likely to induce resistance when used. A novel AMP named Brevinin-1BW (FLPLLAGLAASFLPTIFCKISRKC) was obtained by the Research Center of Molecular Medicine of Yunnan Province from the skin of thePelophylax nigromaculatus. Brevinia-1BW had effective inhibitory effects on Gram-positive bacteria, with a minimum inhibitory concentration (MIC) of 3.125 μg/mL againstEnterococcus faecalis(ATCC 29212) and 6.25 μg/mL against bothStaphylococcus aureus(ATCC 25923) and multidrug-resistantStaphylococcus aureus(ATCC 29213) but had weaker inhibitory effects on Gram-negative bacteria, with a MIC of ≥100 μg/mL. Studies using scanning electron microscopy (SEM) and flow cytometry have revealed that it exerts its antibacterial activity by disrupting bacterial membranes. Additionally, it possesses strong biofilm inhibitory and eradication activities as well as significant lipopolysaccharide (LPS)-binding activity. Furthermore, Brevinin-1BW has shown a significant anti-inflammatory effect in LPS-treated RAW264.7 cells. In conclusion, Brevinin-1BW is anticipated to be a promising clinical agent with potent anti-Gram-positive bacterial and anti-inflammatory properties.
研究领域:
微生物学
·
药理学
·
传染病学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 6
·1229-1237
·
IF 1.797
Zhang Yiyi,Zhang Nan,Wang Qiang,Yu Yuanyuan,Wang Ping,Yuan Jiugang
Most modifications of wool focused on its surface due to the existence of the cuticle scales. For instance, chlorination, oxidation and protease treatments were used to break down or remove the scales. However, these modifications usually severely damaged the internal structure of wool. In this paper, a novel approach based on surface micro-dissolution was employed to modify the surface of wool to minimize the internal damage of wool, and improve the surface-related properties of wool. The micro-dissolution system used NaHSO 3 /urea to dissolve the scale layer of wool. After being micro-dissolved with NaHSO 3 /urea system, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), fluorescence microscopy, Fourier transform infrared spectroscopy (FTIR), and the Allwörden reaction were utilized to characterize the treated wool. Furthermore, felting shrinkage, strength loss and wettability of the treated wool were determined. The results showed that NaHSO 3 /urea system could dissolve the scale layer from outside to inside. The fluorescence microscopic images further indicated that low concentration of NaHSO 3 /urea system can dissolve the surface of wool without the serious damage of internal structure. Moreover, the micro-dissolution system can be controlled to dissolve the scale layer on the surface of wool slightly by adjusting the reaction conditions. The presented method is simple, easy to operate, and economical, thereby can open up new directions for the surface modification of wool.
研究领域:
材料科学
·
纺织工程
·
化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Fuchen Song,Botao Zhang,Xuesong Ge,Yijun Jiang
A strategy for preparation of self-reinforced starch films for use as hard capsule material is introduced. In this study, the hydroxypropylated-crosslinked potato starch (HCPS) was prepared and used to reinforce the hydroxypropylated-hydrolyzed potato starch (HHPS) films. The paste properties of starch samples and the morphology of starch films were investigated by a rapid visco analyzer (RVA) and scanning electron microscope (SEM), respectively. It was found that the matrix/particle interface was greatly improved after the hydroxypropylation of crosslinked starch. The strain and toughness of the starch composite films were increased by about 30% and 50% after addition of 10 wt% HCPS particles, respectively. In addition, the self-reinforced starch film also had good oxygen barrier property, with its oxygen permeating coefficient (OPC) at 5.09 × 10 −12 cm 3 ·cm/cm 2 ·s·cmHg (50% RH). The fragmentation rate of starch capsules has also decreased, indicating it is an alternative material for the preparation of hard capsules.
研究领域:
材料科学
·
制药技术
·
生物聚合物工程
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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）