在保证油脂基本摄入量的同时,提高其饱腹感效应将为体重管理膳食产品的设计研发提供新思路。该文采用逐层静电沉积技术,以乳清分离蛋白(whey protein isolated,WPI)、果胶(pectin,PC)、海藻酸钠(alginate,ALG)、壳聚糖(chitosan,CS)为壁...在保证油脂基本摄入量的同时,提高其饱腹感效应将为体重管理膳食产品的设计研发提供新思路。该文采用逐层静电沉积技术,以乳清分离蛋白(whey protein isolated,WPI)、果胶(pectin,PC)、海藻酸钠(alginate,ALG)、壳聚糖(chitosan,CS)为壁材,构建了具有不同界面结构的乳状液,研究了界面组成对乳状液理化指标的影响,包括粒径、Zeta电位等,同时通过口腔、胃、小肠连续3阶段的体外模拟消化实验,重点观察了乳状液在胃消化阶段的相分离现象来判断其酸稳定性,并监测了乳状液在小肠阶段的游离脂肪酸释放量来评估油脂的消化速率。结果表明,仅由ALG和CS包埋的二级乳液在胃环境中稳定性较差,而由PC包埋的二级乳液在胃环境中有较好的分层稳定性,且在该二级乳液基础上吸附CS形成的三级乳液,可进一步延缓小肠部位的油脂消化速率。综上,由PC和CS构建的三级乳液适合应用在体重管理功能性食品中。展开更多
Based on the experiment of laminated pouring and accumulated liquid forging of 2A12 aluminum alloy, interface bonding of formed component with large altitude to dimeter ratio of altitude to diameter was investigated b...Based on the experiment of laminated pouring and accumulated liquid forging of 2A12 aluminum alloy, interface bonding of formed component with large altitude to dimeter ratio of altitude to diameter was investigated by means of SEM and Instron tensile tester. The results show that the method of laminated pouring and accumulated liquid forging can be used for forming components with large ratio. Pouring temperature, reheated temperature of die, pressure, pouring layers and standing time are all important technique parameters that influence the mechanical properties. When pouring temperature is 740 ℃, reheated temperature of die is 480 ℃, pressure is 500 kN, pouring layers are three and standing time is 5 s, the mechanical properties of interface are the optimum ones, microstructure is equiaxed crystal and tensile fracture has character of dimple. There are three kinds of bonding, which are melting bonding, part melting bonding and mechanical bonding. And the interface of the melting bonding possesses the best mechanical properties.展开更多
The C_(f)/Al composites were joined to the TC4 alloy via the laser-induced combustion joining method.The exothermic reaction of the interlayer provided the required energy for the joining process.By combining the theo...The C_(f)/Al composites were joined to the TC4 alloy via the laser-induced combustion joining method.The exothermic reaction of the interlayer provided the required energy for the joining process.By combining the theoretical calculation and experiment,the chemical composition of the Ni−Al−Zr interlayer was designed.The microstructure and mechanical properties of the joint were investigated.The results show that the addition of Zr slightly weakened the combustion reaction of exothermic interlayer but played a key role in the successful joining.Ni−Al−Zr interlayer reacted with substrates,forming a TiAl_(3)layer adjacent to TC4 alloy and NiAl_(3),Ni_(2)Al_(3)layers adjacent to the C_(f)/Al composites.Zr content dominated the microstructure and shear strength of the joint.When the Zr content was 5 wt.%under the joining pressure of 2 MPa,the joint had a maximum shear strength of 19.8 MPa.展开更多
Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluo...Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluorescence-labeled diblock copolymer,polystyrene-b-polyisoprene, at the interface formed between two immiscible liquids. The interfaces are formed between N,N-dimethylformamide(DMF) and a few immiscible liquids, n-alkane and polyisoprene. Interfacial diffusion coefficient of the diblock copolymer probe is found to decrease monotonously with the increase of the molecular length of the interface constituting liquids. The decrease of diffusion coefficient follows the prediction by Einstein relation using the viscosity of the constituting liquids as the variables only for interfaces between DMF and very small n-alkanes. For interfaces formed between DMF and bigger alkanes and especially between DMF and polyisoprene, the diffusion coefficient is much higher than the calculated value,indicating that the probe molecule starts to probe the much less viscous interfacial region because the interfacial width gets larger,whose thickness is comparable to the molecule size of the liquids.展开更多
文摘在保证油脂基本摄入量的同时,提高其饱腹感效应将为体重管理膳食产品的设计研发提供新思路。该文采用逐层静电沉积技术,以乳清分离蛋白(whey protein isolated,WPI)、果胶(pectin,PC)、海藻酸钠(alginate,ALG)、壳聚糖(chitosan,CS)为壁材,构建了具有不同界面结构的乳状液,研究了界面组成对乳状液理化指标的影响,包括粒径、Zeta电位等,同时通过口腔、胃、小肠连续3阶段的体外模拟消化实验,重点观察了乳状液在胃消化阶段的相分离现象来判断其酸稳定性,并监测了乳状液在小肠阶段的游离脂肪酸释放量来评估油脂的消化速率。结果表明,仅由ALG和CS包埋的二级乳液在胃环境中稳定性较差,而由PC包埋的二级乳液在胃环境中有较好的分层稳定性,且在该二级乳液基础上吸附CS形成的三级乳液,可进一步延缓小肠部位的油脂消化速率。综上,由PC和CS构建的三级乳液适合应用在体重管理功能性食品中。
文摘Based on the experiment of laminated pouring and accumulated liquid forging of 2A12 aluminum alloy, interface bonding of formed component with large altitude to dimeter ratio of altitude to diameter was investigated by means of SEM and Instron tensile tester. The results show that the method of laminated pouring and accumulated liquid forging can be used for forming components with large ratio. Pouring temperature, reheated temperature of die, pressure, pouring layers and standing time are all important technique parameters that influence the mechanical properties. When pouring temperature is 740 ℃, reheated temperature of die is 480 ℃, pressure is 500 kN, pouring layers are three and standing time is 5 s, the mechanical properties of interface are the optimum ones, microstructure is equiaxed crystal and tensile fracture has character of dimple. There are three kinds of bonding, which are melting bonding, part melting bonding and mechanical bonding. And the interface of the melting bonding possesses the best mechanical properties.
基金the financial supports from the National Natural Science Foundation of China(Nos.51975149,51905055)the Natural Science Foundation of Chongqing,China(No.cstc2020jcyj-msxmX0115)the Fundamental Research Funds for the Central Universities Project,China(No.2020CDJ-LHZZ 086).
文摘The C_(f)/Al composites were joined to the TC4 alloy via the laser-induced combustion joining method.The exothermic reaction of the interlayer provided the required energy for the joining process.By combining the theoretical calculation and experiment,the chemical composition of the Ni−Al−Zr interlayer was designed.The microstructure and mechanical properties of the joint were investigated.The results show that the addition of Zr slightly weakened the combustion reaction of exothermic interlayer but played a key role in the successful joining.Ni−Al−Zr interlayer reacted with substrates,forming a TiAl_(3)layer adjacent to TC4 alloy and NiAl_(3),Ni_(2)Al_(3)layers adjacent to the C_(f)/Al composites.Zr content dominated the microstructure and shear strength of the joint.When the Zr content was 5 wt.%under the joining pressure of 2 MPa,the joint had a maximum shear strength of 19.8 MPa.
基金supported by the National Natural Science Foundation of China (51573197, 21544012)the Instrumentation Developments Funding of Chinese Academy of Sciences
文摘Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. Fluorescence correlation spectroscopy was used to study the diffusion of fluorescence-labeled diblock copolymer,polystyrene-b-polyisoprene, at the interface formed between two immiscible liquids. The interfaces are formed between N,N-dimethylformamide(DMF) and a few immiscible liquids, n-alkane and polyisoprene. Interfacial diffusion coefficient of the diblock copolymer probe is found to decrease monotonously with the increase of the molecular length of the interface constituting liquids. The decrease of diffusion coefficient follows the prediction by Einstein relation using the viscosity of the constituting liquids as the variables only for interfaces between DMF and very small n-alkanes. For interfaces formed between DMF and bigger alkanes and especially between DMF and polyisoprene, the diffusion coefficient is much higher than the calculated value,indicating that the probe molecule starts to probe the much less viscous interfacial region because the interfacial width gets larger,whose thickness is comparable to the molecule size of the liquids.
