Food Bioscience
·
2020
·
IF 3.067
Xiao Guan,Lv Li,Sen Li,Jing Liu,Kai Huang
Hordein electrospun ultra-thin fibers are unstable in an aqueous environment. Chitosan was added to improve their water resistance. With increasing chitosan concentration, the viscosity and conductivity of the biopolymer blends increased, and the surface tensions remained almost constant. The structure and morphology of composite biopolymer fiber membranes showed that the average fiber diameter varied with chitosan concentration. ATR-FTIR spectra showed that the C–H stretching band changed or disappeared with increased chitosan. X-ray diffraction showed that chitosan was distributed in hordein fibers without crystallites. Compared with the hordein nanofibers, thermogravimetric analysis and derivative thermogravimetry curves showed that hordein/chitosan electrospun fibers had slightly decreased thermal stability . In conclusion, a low chitosan content improved the water resistance and other properties of hordein fibers, without changing their morphology or structure.
研究领域:
材料科学
·
食品科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Tian Liu,Xingrong Zeng,Xuejun Lai,Hongqiang Li,Yanlin Wang
Organosilicon materials with high capacity of organic-to-inorganic conversion at elevated temperature are always favorable in the field of high-temperature-resistant materials, flame retardant materials, chemical engineering and functional materials in electrical engineering. In this work, it was found out that the platinum-nitrogen catalytic system could obviously enhance the organic-to-inorganic conversion efficiency of silicone rubber (SiR) at elevated temperature. The residual rate of Pt/N/SiR (SiR containing 0.33 phr Karstedt's catalyst (Pt) and 2 phr nitrogenous silane (N)) at 1000 °C was significantly improved from 3.0% to 44.8% in comparison with SiR and its thermal stability was also enhanced. DLS , TEM and UV–vis absorption spectrometry revealed that the platinum in Karstedt's catalyst would aggregate at elevated temperature and deteriorate its catalytic activity for organic-to-inorganic conversion of SiR. And the addition of nitrogenous silane can efficiently inhibit the aggregation and retain the high catalytic efficiency of platinum. A thorough TG-FTIR study, together with SEM/EDX and XPS analyses suggested that the platinum-nitrogen system might suppress the intramolecular cyclic transition and enhance the radical coupling between polymer chains of SiR during thermal degradation , which resulted in the high capacity of organic-to-inorganic conversion of Pt/N/SiR at elevated temperature.
研究领域:
材料科学
·
化学工程
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Aijuan Xie,Jiawen Du,Feng Tao,Yuwei Tao,Zhichen Xiong,Shiping Luo,Xiazhang Li,Chao Yao
A novel three-dimensional graphene surface-mounted nickel-based metal organic framework (3D Gr/Ni-MOF) electrocatalyst was fabricated via freeze-drying technique and ultrasonic assisted method. The morphology, elemental composition , crystal structure, functional group structure, specific surface area and pore size of the composite were analyzed by SEM, EDS, XRD, FTIR, and BET. A series of conditional experiments from the aspects of organic ligand screening, ultrasonic time, molar ratio of metal salt to ligand, and porous graphene loading were carried out to optimize 3D Gr/Ni-MOF composite. Oxygen Evolution Reaction (OER) catalytic performance, OER process kinetics, stability and the deeper causes of enhanced OER performances of 3D Gr/Ni-MOF were also investigated via a group of electrochemical methods. The experiment results showed that 3D Gr/Ni-MOF composite prepared with 2,5-pyridinedicarboxylic acid as ligand, 1:1 M ratio of nickel acetate to ligand, 10 mg of 3D Gr loading and 8 h of ultrasonic process exhibited the most excellent OER activity. Its overpotential of 370 mV was much smaller than rGO/Ni-MOF, Ni-MOF and 3D Gr prepared under the same conditions, and as non-precious metal catalyst , it has the traits of low cost, easy preparation, high activity and durable stability.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Lingyuan Chen,Jiali Tang,Xinyue Zhang,Shixing Wang,Zhaogang Ren
A novel benzothiazole modified chitosan ( BCS ) with excellent Au(III) adsorption performance and selectivity was prepared as adsorbents. The structure and morphology of the adsorbents were characterized by FTIR, SEM, XRD and XPS. The adsorption property of the adsorbents for Au(III) were investigated under different reaction time, initial concentration of Au(III), temperature, pH and coexisting ions. The maximum adsorption capacity of BCS for Au(III) was 1072.22 mg/g at 298 K and optimal pH = 4, which was better than that of other adsorbents reported in literature. The adsorption kinetics and isotherm models fit the pseudo-second-order and Langmuir equations. This shows that the adsorption process of Au(III) is a monolayer chemical adsorption. The adsorption process can proceed spontaneously and belong to the endothermic reaction according to the thermodynamic results. The excellent adsorption performance is mainly attributed to the ion exchange and chelation of the nitrogen, sulfur and oxygen groups on the adsorbent with gold ions. Significantly, BCS has excellent selectivity toward Au(III) and remarkable recycle performance. With the high adsorption capacity, excellent selectivity and outstanding reusability, the BCS adsorbent could be a promising candidate to adsorb Au(III) from wastewater.
研究领域:
材料科学
·
环境化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Fengjiao Cui,Huidong Li,Chen Chen,Zhixia Wang,Xinxin Liu,Gang Jiang,Tianjia Cheng,Runying Bai,Lei Song
In this study, cattail was researched as a natural cellulose source to extract cellulose. Dewaxing, alkali and bleaching treatments were carried out for the cattail fibers (CFs). The FTIR, SEM and XRD results indicated that hemicellulose and lignin were successfully removed from the CFs, and the content of cattail cellulose increased from 41.66 ± 1.11% to 89.72 ± 1.07%. Subsequently, cellulose aerogel was prepared by the extracted cattail cellulose. The Zeolitic imidazolate framework-8 (ZIF-8) was uniformly loaded onto the surface of cellulose aerogel by the in situ growth, and ZIF-8 Cattail Cellulose Aerogel (ZCCA) was finally prepared. The SEM, FTIR, XRD and TGA results further confirmed the successful preparation of ZCCA. Additionally, the results of the adsorption experiment showed that ZCCA had excellent adsorption performance for enrofloxacin, and the maximum adsorption capacity of enrofloxacin reached 172.09 mg·g −1 while showing good reusability. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm model. Thermodynamic studies showed that the adsorption of enrofloxacin was a spontaneous endothermic reaction and that the adsorption mechanism involves the interaction of hydrogen bonds , electrostatic and π-π stacking.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 32
·21882-21889
·
IF 3.9
ManLu Wang,JiaCheng Wu,LiYing Hao,Qiang Wei
Herein, a facile method is proposed for the bulk synthesis of conductive non-metallic carbon nanospheres with controllable morphology to replace conventional metal calibration reference materials (CRMs), such as gold nanoparticles and copper grids. The prepared nanospheres had an average diameter of ∼222 ± 23 nm, where silicon dioxide formed the core and the shell was comprised of the carbon layer. The structure of the conductive carbon nanospheres was characterized using FTIR, SEM, EDS and TEM. Additionally, an innovative design was demonstrated by 3D printing the calibration carrier device. Furthermore, the stability and image linear distortion of the conductive carbon nanospheres were verified using analysis of variance (ANOVA). The results demonstrated that the accelerating voltage, magnification, and various positions in the X/Y axes had no significant effect on measured diameter of nanospheres, which was evident from all the p values being greater than 0.05. The comprehensive set of results reveal that conductive carbon nanospheres have great potential to replace traditional CRMs.
研究领域:
材料科学
·
纳米技术
·
显微镜技术
·
3D打印
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Chaofan Zheng,Huaili Zheng,Yongjun Sun,Bincheng Xu,Yili Wang,Xinyu Zheng,Yongjuan Wang
Poly(4-vinyl pyridine) decorated magnetic chitosan biopolymer (VMCP), as an absorbent and reductant, was prepared and used to remove hexavalent chromium (Cr(VI)) from aqueous solution. Compared with undecorated magnetic biopolymer, VMCP exhibited significantly improved removal performance under identical experimental conditions. The kinetics, isotherms, and thermodynamics of Cr(VI) adsorption onto VMCP were investigated. Results demonstrated that the maximum monolayer adsorption capacity of VMCP was 344.83 mg/g, which was considerably higher than most reported adsorbents. The mechanism for Cr(VI) removal was explored based on XPS and FTIR analyses. The main mechanisms were concluded to be Cr(VI) adsorption onto the positively charged VMCP surface and the reduction of Cr(VI) to Cr(III), followed by coordination between Cr(III) and N atoms. The easy regeneration, satisfactory reusability, and remarkable performance in column tests revealed the high potential of VMCP in treating Cr(VI)-contaminated water.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Hujun Xie,Han Wang,Min Huang,Ying Gao,Qing-Qing Cao,Hao Li,Qingbo Jiao,Gerui Ren,Yong-Quan Xu
(−)-Epigallocatechin-3-gallate (EGCG) is the main active component of tea polyphenols, which endows tea with bitter and astringent taste and is susceptible to degradation in presence of light, heat and oxygen. In this study, whey protein isolate (WPI) and β-cyclodextrin (β-CD) were used to prepare the WPI-β-CD nanocomplexes for masking the bitter taste and protecting EGCG. The encapsulation efficiency of EGCG by WPI-β-CD nanocomplexes reached to 79.61%. Sensory evaluation indicated that the bitter and astringent taste of EGCG was masked. FTIR results suggested that the WPI/β-CD-EGCG nanocomplexes were formed through electrostatic, hydrogen bonding and hydrophobic interactions among WPI, β-CD and EGCG. The molecular mechanism of taste masking was preliminarily investigated by molecular docking, suggesting that the bitter and astringent taste moiety of EGCG was inserted into the hydrophobic cavity of β-CD, thereby masking the bitter and astringent taste of EGCG. The results of in vitro gastrointestinal experiments and scanning electron microscopy indicated that the WPI-β-CD nanocomplexes effectively encapsulated EGCG and achieved sustained release in simulated gastrointestinal conditions, thus showing potential application prospects in tea beverages and related areas.
研究领域:
食品科学
·
纳米技术
·
饮料技术
·
感官科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2015
·Vol. 72
·期 6
·1531-1543
·
IF 1.438
Zhou Zhihua,Huang Huihua,Huang Tianlong,Peng Cheng,Zhou Hu,Liu Qingquan,Zeng Wennan,Liu Lihua,Cao Dafu,He Siliang,Xiang Liujiao,Yan Hua
Novel maleated poly( d , l -lactide- co -glycolide) (MPLGA) was melt copolymerized directly from maleic anhydride, d,l -lactide and glycolide monomers with stannous octoate as catalyst and benzoyl peroxide as initiator. FTIR, 1 H NMR, GPC and maleation content were employed to qualitatively characterize the synthesized MPLGA. The effects of the catalyst dosage, reaction time and reaction temperature on weight average molecular mass, polydispersity index and maleation content of MPLGA were also investigated. The results indicated that the novel MPLGA was successfully obtained using melting-copolymerization method. MPLGA, with a weight average molecular mass of about 5.39 × 10 4 Da, a polydispersity index of 1.51 and a maleation content of 7.1 wt%, was obtained when polymerization was conducted with catalyst dosage of 0.03 wt% for 36 h at 140 °C. The results indicated that the introduction of maleic anhydride into PLGA may offer new and important options for biomaterial applications.
研究领域:
材料科学
·
高分子化学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Kun Jiang,Jin Zhang,Yingfei Wan,Zengjian Liu,Jinwei Chen
In order to obtain the advanced photocatalyst with high performance for removing the gaseous formaldehyde, a new strategy with amination of titanium dioxide (TiO 2 ) and combination with reduced graphene oxide (rGO) is proposed in this work. TiO 2 was first aminated into amino-TiO 2 and then combined with rGO by an electrostatic self-assembly process to form the amino-TiO 2 /rGO photocatalysts. The structure and morphology were characterized by XRD , FTIR, and SEM, respectively. Physicochemical properties were measured by EIS, XPS , ESR , PL , and photocurrent measurements. The mechanism of the photocatalytic reaction was studied. Optimal amino-TiO 2 /rGO catalyst exhibits high catalytic activity and recyclability. The reaction rate constant of HCHO over this catalyst is approximately 9.8 × 10 −3 L mol −1 ·min −1 , which is 10.5 times higher than that of the commercial Degussa P25 TiO 2 . The analysis results from XPS and ESR indicates that the high catalytic activity could be mainly attributed to the imine formed by chemisorption of amino and HCHO. The reaction speed of formaldehyde photolysis increases as the concentration of HCHO on the photocatalyst surface increased. In addition, the introduction of graphene enhances carrier separation efficiency so that leads to more reactive radicals such as hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ), leading to improved performance on formaldehyde photolysis. This could provide a useful method for highly efficient formaldehyde photocatalysis .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2020
·
IF 4.244
Chang Liu,Jiao Huang,Xuejing Zheng,Shujie Liu,Kuakua Lu,Keyong Tang,Jie Liu
The present study aimed to develop heat sealable soybean polysaccharide (SSPS)/gelatin blend films intended to be used as edible food packaging materials. The films were fabricated by solution casting method using SSPS/gelatin blends and plasticized by glycerol. The results indicated that the heat sealability, stretchability and resistance to fracture of the films were significantly improved by blending SSPS with gelatin. The incorporation of gelatin into SSPS films also increased the thermal stability but decreased the water solubility, rigidity and water vapor permeability of the films. ATR-FTIR spectra and DSC results indicated strong interactions between SSPS and gelatin. The studies of optical properties, SEM, AFM, and XRD revealed that SSPS and gelatin were compatible to a certain degree in this blend system. Packaging tests confirmed that the blend films have showing potential as edible material in food packaging.
研究领域:
食品科学
·
材料科学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Long Lv,Nan Chen,Chuanping Feng,Yu Gao,Miao Li
In this study, Xanthate-modified magnetic chitosan/poly (vinyl alcohol) particles (XMMCP) were synthesized by momentary gelation method and characterized to evaluate its properties. The results of FTIR and XRD analysis indicated that most of basic characteristic peaks were weakened in the spectrum of XMMCP compared with the spectrum of pure chitosan, PVA, and Fe 3 O 4 and the diffraction intensity decreased owing to a decline in crystallinity, respectively. The BET surface area, total pore volume and magnetization saturation value of XMMCP were 15.52 m 2 /g, 0.048 cm 3 /g and 34.8 emu/g, respectively, which ensured enough contact of material surface with the metal ions present for adsorption. Based on SEM images, rough and uneven surface of adsorbent was benefited to adsorption performance of Pb(II). Furthermore, the resulting adsorbent showed stability below 150 °C and good magnetic properties. The resulting material was stable in deionized water, acidic, and basic media in 10 days. Continuous adsorption–desorption cyclic results demonstrated that XMMCP could effectively adsorb Pb 2+ and Pb 2+ -loaded XMMCP could be effectively regenerated by HCl solution. Meanwhile, regenerated composite particles could be employed for repeated use without significant capacity loss. Therefore, XMMCP can be a promising material to treat water with Pb 2+ .
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）