FOOD RESEARCH INTERNATIONAL
·
2013
·
IF 3.005
Li-Juan Han,Lin Li,Lei Zhao,Bing Li,Guo-Qin Liu,Xin-Qi Liu,Xue-De Wang
Mixtures of sitosterol (S) and lecithin (L) are able to prepare food-grade organogel by structuring liquid edible oil . In this paper, various S to L mass ratios (i.e., S0L10 to S10L0) in the sunflower oil (SO) high in trilinolein were used to develop organogels at three storage temperatures ( T s : 5, 15 and 25 °C). Influences of mass ratio and storage temperature on the rheological properties of organogels after ten days of storage were evaluated in detail, and the corresponding microstructures of the crystal network in these organogels were studied by microscopy. At each storage temperature, the rheological properties of the organogels formed by sitosterol and lecithin were different from organogels formed from sitosterol alone. The crystal microstructure in organogels also revealed a dependence on structurant composition and T s . By increasing T s , the elasticity and thermal stability of the organogel developed by mixed structurant were enhanced, and the length of microplatelet units was increased along with a decrease in mesh size, leading to the formation of higher ordered networks, and therefore, the most typical example (S8L2 organogel at T s = 25 °C) had a higher elasticity than other organogels. The observed rheological behavior is likely to be associated with the composition of structurant, the storage temperature, the viscosity of liquid oil and the microstructure of crystal network.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2014
·
IF 0.687
Jijiao Li,Bo Li,Hongya Wu,Ji Zhou
Barium titanate ( BaTiO 3 ) woodpile structures with designed, three-dimensional (3D) geometry have been fabricated by direct-writing assembly techniques. Concentrated BaTiO 3 inks with suitable rheological properties were prepared to enable the fabrication of the complex 3D structures. It was demonstrated that BaTiO 3 inks with a total solids volume fraction of 0.41 are shear thinning and have a high storage modulus 1 × 10 5 Pa with a yield stress of 300 Pa. Additionally, the woodpile lattice structures exhibited an excellent self-supporting feature.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 9
·4955-4968
·
IF 3.809
Li Weijie,Zhang Fengying,Wang Weiku,Li Yinhui,Liu Yaodong,Lu Chunxiang,Zhang Zhengfang
Abstract
Cellulose was dissolved in LiCl/DMAc solvent system at various concentrations. Using rheological measurements, we observed that the cellulose solution becomes gelled upon heating and jelly-like during cooling. Interestingly, while phase separation occurs during heating (from room temperature to higher) along with a sol–gel transition, and this transition is irreversible, the cooling (from room temperature to lower) induced solution property transition from more viscous to more elastic is completely reversible. The structural changes of cellulose solution during heating and cooling cycles are in situ monitored by infrared spectroscopy, and we found that the temperature of the solution affects the interactions among DMAc, lithium cations, chloride anions, and the hydroxyl groups in cellulose chains. While heating induces phase separation and gelation of cellulose solutions, cooling simply turns the solution into a reversible jelly status. Also, when cellulose concentration increases, the gelation temperature caused by heating becomes significantly lower. Possible mechanisms of the rheological transitions of cellulose/LiCl·DMAc solutions during either heating or cooling are proposed in this study. Graphical abstract
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
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2015
·Vol. 16
·期 12
·28146-28155
·
IF 2.862
Qing You,Yan Zhang,Huan Wang,Hongfu Fan,Jianping Guo,Ming Li
Wormlike micelles are typically formed by mixing cationic and anionic surfactants because of attractive interactions in oppositely charged head-groups. The structural transitions of wormlike micelles triggered by pH in ionic liquids composed ofN-alkyl-N-methylpyrrolidinium bromide-based ILs (ionic liquids) and anthranilic acid were investigated. These structures were found responsible for the variations in flow properties identified by rheology and dynamic light scattering, and account for the structures observed with cryogenic transmission electron microscopy (Cryo-TEM). High-viscosity, shear-thinning behavior, and Maxwell-type dynamic rheology shown by the system at certain pH values suggested that spherical micelles grow into entangled wormlike micelles. Light scattering profiles also supported the notion of pH-sensitive microstructural transitions in the solution. Cryo-TEM images confirmed the presence of spherical micelles in the low-viscosity sample and entangled wormlike micelles in the peak viscosity sample. Nuclear magnetic resonance spectroscopy analysis revealed that the pH sensitivity of ionic liquid systems originated from the pH-dependent binding ability of anthranilic acid to the cationic headgroup of ionic liquids.Keywords:pH-sensitive;wormlike micelles;rheology;morphological variation;formation mechanism
研究领域:
化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Xiaohong He,Taotao Dai,Jian Sun,Ruihong Liang,Wei Liu,Mingshun Chen,Jun Chen,Chengmei Liu
This study evaluated the ability to change properties of XG by industry-scale microfluidization (ISM). XG was treated by ISM for one pass at 30, 60, 90, 120 MPa and two passes at 120 MPa. Flow behavior of ISM-treated XG (FD) was investigated, and structural properties were determined by HPSEC-MALLS, SEM, XRD and FITR analysis. Monosaccharide compositions of ISM-treated XG (FD) after dialysis were determined to investigate the way of disrupting chain. ISM treatment significantly reduced apparent viscosity and molecular weight (Mw) of XG. Viscosity of ISM-treated XG (FD) couldn't be recovered by dissolving in 0.1 M NaCl, implying that treatment induced scission of XG chain in addition to disrupting weak associations between XG. The decrease ratio of Mw reached the maximum (57.19%) after treatment at 120 MPa for one pass, and treatment for two passes did not further reduce Mw of XG, implying that ISM was an effective technology to degrade XG. The change trend of molecular parameters including R g , PDI, ρ and SV g conformed to that of Mw. The alterations of monosaccharide molar ratios for the dialyzed ISM-treated XG (FD) indicated that ISM treatment broke glycosidic bonds in the main and side chains of XG. Additionally, ISM treatment transformed the morphology from smooth sheet-like into banded even fragmented structure and weakened the organization of XG. Similar characteristic peaks of FTIR spectra demonstrated that ISM treatment had no effect on primary structure of XG. Based on the above results, a model was proposed to illustrate the alterations of XG chain induced by ISM treatment.
研究领域:
食品科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 23
·4374
·
IF 3.06
Wenxiao Jiao,Wenxue Chen,Yuqi Mei,Yonghuan Yun,Boqiang Wang,Qiuping Zhong,Haiming Chen,Weijun Chen
The aim of this study was to prepare sodium alginates (SAs) with different molecular weight and G/M ratio, and characterize their rheological behaviors and emulsifying properties. The result of Fourier transform infrared (FTIR) showed that the chemical bonds among the β-d-mannuronic acid- (M-), α-l-guluronic acid- (G-), and MG-sequential blocks in the SA chains were not changed significantly by acid treatment. Meanwhile, the molecular weight and G/M ratio of the SA exhibited drastic variation after acid modification. The result of rheological analysis suggesting that the apparent viscosity of SA reduced from 30 to 16.4 mPa.s with the increase of shear rate, reveals that SA solution belongs to pseudoplastic liquid. Also, the apparent viscosity of acid-modified SA solution dropped rapidly with the decrease of the molecular weight. The properties of emulsions stabilized by SA, SA-Ms, and commercial SAs were evaluated via the interface tensiometry and determination of the zeta potential, droplet size, creaming index (CI), and Turbiscan stability index (TSI). Compared with the SA-stabilized emulsion, the interfacial tension of the emulsion stabilized by SA-M increased with the decrease of the molecular weight reduced at the similar M/G ratio. The decrease in zeta potential and the increase in TSI of the emulsion were observed with the decrease of molecular weight, indicating that molecular weight plays an important role on the emulsifying ability of SA. In addition, the SA with low G/M ratio can form emulsions with stable and fine droplets.Keywords:sodium alginate;rheological behavior;emulsifying property
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Zhengshang Wang,Wen Cui,Hao Yuan,Xiaoli Kang,Zhou Zheng,Wenbin Qiu,Qiujun Hu,Jun Tang,Xudong Cui
Waste heat recovery systems built with thermoelectric (TE) materials offer promising means to generate electricity from waste heat directly, if TE materials or devices with controllable shapes are created through direct ink writing . However, the nature of TE inks used for direct ink writing must be modified with appropriate rheology to maintain stability and facilitate extrusion, as well as proper mechanical properties to resist deformation. Here, we report Bi 2 Te 3 -based inks modified with additives that allow direct printing of tunable architectures. The polyelectrolyte additives-induced adsorbed layers on the surface of TE particles are shown to significantly improve the stability and viscoelasticity of inks. Besides, the improved inks modified with methylcellulose additives exhibit an apparent enhancement of strength properties , thereby enabling the predesigned shapes to hold the successive layers printed above. Using charge control and framework reinforcement, the Bi 2 Te 3 -based inks print a series of architectures with porous structures, which largely reduce thermal conductivities . As a result, our three-dimensional-printed materials display high figures of merit ZT of 0.65 and 0.53 for p- and n-type. This work explores how additives can influence both rheological properties, printability, and microstructures, which pave the way to construct complex architectures and improve TE performance for structural and functional applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2022
·Vol. 11
·期 23
·3757
·
IF 5.561
Tianzhen Xiong,Haomin Sun,Ziyi Niu,Wei Xu,Zhifan Li,Yawen He,Denglin Luo,Wenjie Xi,Jingjing Wei,Chunlan Zhang
In this study, Pickering emulsion gels were prepared by the self-gel method based on kappa carrageenan (kC). The effects of particle stabilizers and polysaccharide concentrations on the microstructure, rheological characteristics, and texture of Pickering emulsion gels stabilized by xanthan gum/lysozyme nanoparticles (XG/Ly NPs) with kC were discussed. The viscoelasticity of Pickering emulsion gels increased significantly with the increase of kC and XG/Ly NPs. The results of temperature sweep showed that the gel formation mainly depended on the kC addition. The XG/Ly NPs addition could accelerate the formation of Pickering emulsion gels and increase its melting temperature (Tmelt), which is helpful to improve the thermal stability of emulsion gels. Cryo-scanning electron microscope (Cryo-SEM) images revealed that Pickering emulsion gel has a porous network structure, and the oil droplets were well wrapped in the pores. The hardness increased significantly with the increase of XG/Ly NPs and kC. In particular, the Pickering emulsion gel hardness was up to 2.9 Newton (N) when the concentration of kC and XG/Ly NPs were 2%. The results showed that self-gelling polysaccharides, such as kC, could construct and regulate the structure and characteristics of Pickering emulsion gel. This study provides theoretical support for potential new applications of emulsion gels as functional colloids and delivery systems in the food industry.Keywords:Pickering emulsion gels;kappa carrageenan;rheological properties;microstructure
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Xin-Yu Jiang,Jia-Nan Yan,Yi-Nan Du,Shi-Qi Xu,Hai-Tao Wu
In this communication, the rheological behaviors of hydrolysates from scallop ( Patinopecten yessoensis ) male gonad (SMGHs) combined with eight polysaccharides , including ι -carrageenan, sodium alginate , guar gum , locust-bean gum, pectin, acacia gum, xanthan gum and agar, respectively, were reported. The mixture of SMGHs (5%) and each polysaccharide (0.03–1.25%) was characterized by visual observation and rheological characterization in the concentration ranges where each polysaccharide has visible viscosity and keeps flowing. The addition of ι -carrageenan (0.56%) increased the storage modulus of SMGHs at 0.1 Hz by almost 77-fold, reaching 344.9 Pa. While, when the shear rate was 0.13 s −1 , the mixed-gel viscosity of SMGHs/guar gum and SMGHs/locust-bean gum reached to 137.6 and 129.0 Pa·s, respectively. Moreover, SMGHs have potential application as a gelling agent in the food processing by complexing with a certain polysaccharide.
研究领域:
食品科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2023
·Vol. 9
·期 4
·318
·
IF 4.6
Xuejiao Ren,Xin Meng,Zhen Zhang,Hongyu Du,Tuoping Li,Na Wang
In this study, flaxseed gum (FG) was extracted using hot water extraction and ultrasonic-assisted extraction. The yield, molecular weight distribution, monosaccharide composition, structure, and rheological properties of FG were analyzed. The FG yield (9.18) achieved using ultrasound-assisted extraction (this sample was labeled as UAE) was higher than the yield (7.16) achieved with hot water extraction (this sample was labeled as HWE). The polydispersity, monosaccharide composition, and characteristic absorption peaks of the UAE were similar to that of the HWE. However, the UAE had a lower molecular weight and looser structure than the HWE. Moreover, zeta potential measurements indicated that the UAE exhibited better stability. An analysis of the rheological properties showed that the viscosity of the UAE was lower. Thus, the UAE had an effectively better yield of FG, preliminarily modified structure, and rheological properties, and provided a theoretical basis for its application in food processing.Keywords:flaxseed gum;ultrasound-assisted extraction;structural properties;rheological properties
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GLYCOCONJUGATE JOURNAL
·
2022
·Vol. 39
·期 6
·773-787
·
IF 3.009
Li Fengshu,Hu Xin,Sun Xiaojun,Li Haoshuai,Lu Jinren,Li Yiming,Bao Mutai
The pH value was essential for the growth and metabolism of microorganisms. Acidic pH exopolysaccharide (AC-EPS) and alkaline pH exopolysaccharide (AL-EPS) secreted by A. australica QD mediated by pH were studied in this paper. The total carbohydrate content and molecular weight of AC-EPS (79.59% ± 2.24% (w/w), 8.374 × 10 5 Da) and AL-EPS (82.48% ± 1.46% (w/w), 6.182 × 10 5 Da) were estimated and compared. In AC-EPS, mannose (3.78%) and galactose (3.24%) content was more, while the proportion of glucuronic acid was less in comparison to AL-EPS. The scanning electron microscopy revealed the structural differences among the AC-EPS and AL-EPS. Thermogravimetric analysis showed degradation temperatures of 272.8 °C and 244.9 °C for AC-EPS and AL-EPS, respectively. AC-EPS was found to exhibit better rheological properties and emulsifying capabilities, while AL-EPS had superior antioxidant activities. Overall, both AC-EPS and AL-EPS have the potential to be used as emulsifiers and biological antioxidants.
Graphical Abstract
研究领域:
微生物学
·
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 2
·306
·
IF 3.164
Tobias Standau,Chunjing Zhao,Svenja Murillo Castellón,Christian Bonten,Volker Altstädt
Polylactide (PLA) is known as one of the most promising biopolymers as it is derived from renewable feedstock and can be biodegraded. During the last two decades, it moved more and more into the focus of scientific research and industrial use. It is even considered as a suitable replacement for standard petroleum-based polymers, such as polystyrene (PS), which can be found in a wide range of applications—amongst others in foams for packaging and insulation applications—but cause strong environmental issues. PLA has comparable mechanical properties to PS. However, the lack of melt strength is often referred to as a drawback for most foaming processes. One way to overcome this issue is the incorporation of chemical modifiers which can induce chain extension, branching, or cross-linking. As such, a wide variety of substances were studied in the literature. This work should give an overview of the most commonly used chemical modifiers and their effects on rheological, thermal, and foaming behavior. Therefore, this review article summarizes the research conducted on neat and chemically modified PLA foamed with the conventional foaming methods (i.e., batch foaming, foam extrusion, foam injection molding, and bead foaming).Keywords:polylactide (PLA);biofoams;chemical modification;foam extrusion;batch foaming;foam injection molding;bead foaming;rheology;crystallization;density reduction
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）