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Dynamic characteristics of multi-span spinning beams with elastic constraints under an axial compressive force
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作者 Xiaodong GUO Zhu SU Lifeng WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第2期295-310,共16页
A theoretical model for the multi-span spinning beams with elastic constraints under an axial compressive force is proposed.The displacement and bending angle functions are represented through an improved Fourier seri... A theoretical model for the multi-span spinning beams with elastic constraints under an axial compressive force is proposed.The displacement and bending angle functions are represented through an improved Fourier series,which ensures the continuity of the derivative at the boundary and enhances the convergence.The exact characteristic equations of the multi-span spinning beams with elastic constraints under an axial compressive force are derived by the Lagrange equation.The efficiency and accuracy of the present method are validated in comparison with the finite element method(FEM)and other methods.The effects of the boundary spring stiffness,the number of spans,the spinning velocity,and the axial compressive force on the dynamic characteristics of the multi-span spinning beams are studied.The results show that the present method can freely simulate any boundary constraints without modifying the solution process.The elastic range of linear springs is larger than that of torsion springs,and it is not affected by the number of spans.With an increase in the axial compressive force,the attenuation rate of the natural frequency of a spinning beam with a large number of spans becomes larger,while the attenuation rate with an elastic boundary is lower than that under a classic simply supported boundary. 展开更多
关键词 multi-span spinning beam elastic constraint improved Fourier series free vibration semi-analytical solution
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Low Mantle Perovskite:Solid Solution, Spin State of Iron and Water Solubility
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作者 LI Lin LI Qing LI Sheng-Rong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第6期1884-1894,共11页
Silicate perovskites((Mg, Fe)SiO 3 and CaS iO 3) are believed to be the major constituent minerals in the lower mantle. The phase relation, solid solution, spin state of iron and water solubility related to the lo... Silicate perovskites((Mg, Fe)SiO 3 and CaS iO 3) are believed to be the major constituent minerals in the lower mantle. The phase relation, solid solution, spin state of iron and water solubility related to the lower mantle perovskite are of great effect on the geodynamics of the Earth's interior and on ore mineralization. Previous studies indicate that a large amount of iron coupled with aluminum can incorporate into magnesium perovskite, but this is discordant with the disproportionation of(Mg,Fe)SiO 3 perovskite into iron-free MgS i O3 perovskite and hexagonal phase(Mg0.6Fe0.4)SiO 3 in the Earth's lower mantle. MnS iO 3 is the first chemical component confirmed to form wide range solid solution with Ca SiO 3 perovskite and complete solid solution with MgS i O3 perovskite at the P-T conditions in the lower mantle, and addition of Mn Si O3 will strongly affects the mutual solubility between Mg Si O3 and CaS iO 3. The spin state of iron is deeply depends on the site occupation of the Fe3+or Fe2+, the synthesis and the annealing conditions of the sample. It seems that the spin state of Fe2+ in the lower mantle perovskite can be settled as high spin, however, the existence of intermediate spin or low spin state of Fe2+ in perovskite has not been clarified. Moreover, different results have also been reported for the spin state of Fe3+ in perovskite. The water solubility of the lower mantle perovskite is related with its composition. In pure Mg SiO 3 perovskite, only less than 500 ppm water was reported. Al–Mg Si O3 perovskite or Al–Fe–MgS iO 3 perovskite in the lower mantle accommodates water of 1100 to 1800 ppm. Further experiments are necessary to clarify the detailed conditions for perovskite solid solution, to reliably analyze the valence and spin states of iron in the coexisting iron-bearing phases, and to compare the water solubility of different phases at different layers for deeply understanding the geodynamics of the Earth's interior and ore mineralization. 展开更多
关键词 solid solution spin state of iron water solubility PEROVSKITE low mantle
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Exact solutions of an Ising spin chain with a spin-1 impurity
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作者 黄旭初 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第3期515-521,共7页
An exact solution of a single impurity model is hard to derive since it breaks translation invariance symmetry. We present the exact solution of the spin-1/2 transverse Ising chain imbedded by a spin-1 impurity. Using... An exact solution of a single impurity model is hard to derive since it breaks translation invariance symmetry. We present the exact solution of the spin-1/2 transverse Ising chain imbedded by a spin-1 impurity. Using the hole decompo- sition scheme, we exactly solve the spin-1 impurity in two subspaces which are generated by a conserved hole operator. The impurity enlarges the energy deformation of the ground state above a pure transverse Ising system without impurity. The specific heat coefficient shows a small anomaly at low temperature for finite size. This indicates that the impurity can tune the ground state from a magnetic impurity space to a non-magnetic impurity space, which only exists for spin-1 impurity comparing with spin-1/2 impurity and a pure transverse Ising chain without impurity. These behaviors essentially come from adding impurity freedom, which induces a competition between hole and fermion excitation depending on the coupling strength with its neighbor and the single-ion anisotropy. 展开更多
关键词 exact solution spin chain IMPURITY
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Exact Solution to Spin Squeezing of the Arbitrary-Range Spin Interaction and Transverse Field Model
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作者 陈星 张振伟 +3 位作者 赵环 王暖让 杨仁福 冯克明 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第10期62-66,共5页
We investigate spin squeezing effects of trapped ions in an off-resonance optical potential system using the arbitrary range spin spin interaction and transverse field model. The collective spin noises at any time are... We investigate spin squeezing effects of trapped ions in an off-resonance optical potential system using the arbitrary range spin spin interaction and transverse field model. The collective spin noises at any time are analyzed exactly. The general expression of spin squeezing factor is presented for arbitrary-range spin interaction. For the nearest-neighbor and next-nearest neighbor spin interaction model, the analytic solutions are reduced from the general expressions. It is shown that the maximum spin squeezing is enhanced for the general arbitrary-range spin interaction compared with the nearest-neighbor interaction model as the long-range interaction with arbitrary sites enforces stronger correlation. 展开更多
关键词 of on for in Exact solution to spin Squeezing of the Arbitrary-Range spin Interaction and Transverse Field Model is
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Double-stretching as an effective and generalizable strategy towards thinner nanofibers in solution blow spinning 被引量:1
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作者 Baopu Zhang Ziwei Li +4 位作者 Zekun Cheng Lei Li Chong Yang Haiyang Wang Hui Wu 《Nano Research》 SCIE EI CSCD 2023年第4期5709-5714,共6页
Solution blow spinning(SBS)applies high-speed airflow to prepare fibers by generating a strong stretching force.It has the advantages of scalable production,tailorable morphologies,and wide applicability.Yet,the SBS s... Solution blow spinning(SBS)applies high-speed airflow to prepare fibers by generating a strong stretching force.It has the advantages of scalable production,tailorable morphologies,and wide applicability.Yet,the SBS strategy can hardly prepare fibers down to the sub-100 nanometers,which limits its performance in demanding applications.Herein,we overcome the limitation of SBS by introducing a second airflow.This novel strategy is termed double-stretching SBS(DS-SBS)because an extra stretching force is exerted on the fiber when it converges with the second airflow.Polyamide6 nanofibers with an average diameter of 80 nm are successfully prepared with the DS-SBS strategy,while the SBS strategy could only prepare submicron fibers with an average diameter of 120 nm.Further,the generality of the DS-SBS strategy to reduce fiber diameter is verified on numerous solute-solvent pairs. 展开更多
关键词 NANOFIBERS solution blow spinning double-stretching computational fluid dynamics
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溶液气喷纺丝技术在食品领域中的应用进展 被引量:1
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作者 宁芊 郭震 +1 位作者 吴先辉 庞杰 《食品工业科技》 CAS 北大核心 2024年第12期379-385,共7页
纳米纤维材料不仅在医药、能源和电子等领域得到广泛应用,近年来还在食品相关领域展现出巨大的潜力。在众多的纳米纤维材料制备方法中,溶液喷射纺丝技术以其安全性、低成本和高生产速率等优势逐渐崭露头角,成为研究的焦点。本文深入探... 纳米纤维材料不仅在医药、能源和电子等领域得到广泛应用,近年来还在食品相关领域展现出巨大的潜力。在众多的纳米纤维材料制备方法中,溶液喷射纺丝技术以其安全性、低成本和高生产速率等优势逐渐崭露头角,成为研究的焦点。本文深入探讨溶液喷射纺丝技术的工作原理和分类,以及对纤维结构产生显著影响的纺丝工艺参数的选择。重点总结了溶液喷射纺丝在食品包装、缓释系统、过滤材料和酶固定化等多个食品相关领域的研究进展和应用优势,旨在为溶液喷射纺丝技术的优化、拓展应用领域和商业化提供参考。 展开更多
关键词 溶液气喷纺丝 纳米纤维 高分子 食品应用
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高分子量壳聚糖皮芯结构微纳米纤维膜制备
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作者 房磊 刘秀明 +5 位作者 贾娇娇 蔺志浩 任燕飞 侯凯文 巩继贤 扈延龄 《纺织学报》 EI CAS CSCD 北大核心 2024年第9期1-9,共9页
高分子量壳聚糖因具有良好的抗菌性、可促进细胞和组织生长以及可降解等特性,被认为是促进伤口愈合的优良材料;然而高分子量壳聚糖纺丝液黏度大,用常规静电纺丝法难以制成微纳米纤维。为解决这个问题,采用溶液喷射纺丝法制备了高分子量... 高分子量壳聚糖因具有良好的抗菌性、可促进细胞和组织生长以及可降解等特性,被认为是促进伤口愈合的优良材料;然而高分子量壳聚糖纺丝液黏度大,用常规静电纺丝法难以制成微纳米纤维。为解决这个问题,采用溶液喷射纺丝法制备了高分子量壳聚糖/聚氧化乙烯微纳米纤维,纺丝液含有质量分数为1.6%的高分子量壳聚糖和2.5%~5.0%的聚氧化乙烯(相对分子质量为10万)。所制备的微纳米纤维呈直线形,表面呈不光滑波纹状。通过MatLab对扫描电子显微镜照片进行识别和计算,结果表明,当聚氧化乙烯质量分数从2.5%增加到5.0%时,纤维平均直径从133 nm增加到210 nm,直径分布变宽;微纳米纤维材料中大孔隙增多,孔隙率在0.69左右,变化不大;X射线光电子能谱和透射电子显微镜分析结果表明,所制备的高分子量壳聚糖/聚氧化乙烯喷射纺丝微纳米纤维具有皮芯结构,其中,聚氧化乙烯位于皮层,高分子量壳聚糖构成微纳米纤维的内芯;动物实验初步证明了高分子量壳聚糖皮芯结构微纳米纤维可以促进伤口愈合。 展开更多
关键词 医用敷料 溶液喷射纺丝法 壳聚糖 聚氧化乙烯 微纳米纤维 皮芯结构
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熔体旋甩工艺对Mg_(2)(Si_(0.4)Sn_(0.6))Sb_(0.015)固溶体微结构和热电性能的影响研究
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作者 刘洪亮 郭志迎 +3 位作者 袁晓峰 朱尊伟 高倩倩 张忻 《材料导报》 EI CAS CSCD 北大核心 2024年第12期27-31,共5页
Mg_(2)(Si,Sn)基材料是环境友好的热电材料,具有较好的应用前景。本工作采用熔体旋甩(MS)结合放电等离子烧结(SPS)技术(MS+SPS)制备了单相的Mg_(2)(Si_(0.4)Sn_(0.6))Sb0.015固溶体,通过将机械合金化(MA)与放电等离子烧结(SPS)技术(MA+S... Mg_(2)(Si,Sn)基材料是环境友好的热电材料,具有较好的应用前景。本工作采用熔体旋甩(MS)结合放电等离子烧结(SPS)技术(MS+SPS)制备了单相的Mg_(2)(Si_(0.4)Sn_(0.6))Sb0.015固溶体,通过将机械合金化(MA)与放电等离子烧结(SPS)技术(MA+SPS)结合制备的相同样品进行对比,研究MS工艺对样品微结构以及热电性能的影响。结果表明,MS得到的固溶体薄带主要由200~500 nm的小颗粒组成,将薄带研磨制粉经SPS烧结后得到的致密块体具有明显细化的晶粒和分布均匀的共格纳米析出相。与MA+SPS工艺制备的样品相比,MS+SPS制备的固溶体的迁移率明显降低,在一定温度范围内,电阻率略有升高,Seebeck系数显著增加,热导率和晶格热导率显著降低。MS+SPS制备的Mg_(2)(Si_(0.4)Sn_(0.6))Sb0.015固溶体热电性能明显提高,在643 K时其最大ZT值达到1.30。 展开更多
关键词 Mg_(2)Si_(0.4)Sn_(0.6)固溶体 熔体旋甩(MS) 纳米析出相 热电性能
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溶液喷射纺丝参数对聚丙烯腈直径分布的影响
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作者 桂早霞 刘茜 +1 位作者 孙光武 魏闯 《针织工业》 北大核心 2024年第2期25-30,共6页
利用溶液喷射纺丝技术,成功制备聚丙烯腈纤维膜。采用扫描电镜观察纤维膜的形貌,探究不同纺丝工艺参数对纤维直径分布的影响。结果表明:纤维直径与聚合物质量分数、聚合物溶液挤出速度、喷丝孔内径呈正比,并且随上述工艺参数的增加,纤... 利用溶液喷射纺丝技术,成功制备聚丙烯腈纤维膜。采用扫描电镜观察纤维膜的形貌,探究不同纺丝工艺参数对纤维直径分布的影响。结果表明:纤维直径与聚合物质量分数、聚合物溶液挤出速度、喷丝孔内径呈正比,并且随上述工艺参数的增加,纤维直径分布较为离散;纤维直径与喷射气流的压强、接收距离呈反比,并且随上述工艺参数增加,纤维直径分布逐渐集中。经分析,获得最优工艺参数:聚合物质量分数为12%,喷射气流的压强为0.15 MPa,接收距离为70 cm,溶液挤出速度为0.3 mL/min,喷丝孔内径为0.32 mm。 展开更多
关键词 溶液喷射纺丝 聚丙烯腈 工艺参数 微纳米纤维 直径分布 纤维形貌
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Hasimoto曲面的运动及其相应的Spin方程的精确解(英文)
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作者 李翊神 陈春丽 《中国科学技术大学学报》 CAS CSCD 北大核心 2000年第3期253-262,共10页
利用测地坐标下的曲面运动与AKNS系统的关系 ,得到Hasimoto曲面运动的精确解 。
关键词 曲面运动 旋转方程 spin方程 Hasimoto曲面
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蜘蛛丝蛋白纤维的研究进展
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作者 路小彬 李行利 《山东化工》 CAS 2024年第9期102-105,共4页
蜘蛛丝是一种具有卓越力学性能和生物相容性的天然材料,近年来在医学、纺织、航空、军事等领域得到了广泛的应用。本文首先介绍了蜘蛛丝蛋白的基本结构与性质,然后梳理了目前合成蜘蛛丝纤维的主要方法,包括遗传工程、溶剂纺丝和湿法纺... 蜘蛛丝是一种具有卓越力学性能和生物相容性的天然材料,近年来在医学、纺织、航空、军事等领域得到了广泛的应用。本文首先介绍了蜘蛛丝蛋白的基本结构与性质,然后梳理了目前合成蜘蛛丝纤维的主要方法,包括遗传工程、溶剂纺丝和湿法纺丝等。在此基础上,分析了现有研究中存在的问题及挑战,并展望了未来研究方向。 展开更多
关键词 蜘蛛丝蛋白 纤维 遗传工程 溶剂纺丝法 湿法纺丝法
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碳纤维制备及前景展望
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作者 李力子 《广东化工》 CAS 2024年第18期93-94,97,共3页
本文阐述了碳纤维实验室制备过程并计算了其热导率,实验过程是围绕静电纺丝技术制备碳纤维展开的(所有制备设备和材料均来源于内蒙古工业大学化工学院实验室),静电纺丝技术在制备复合纤维方面是有独特的优势的。本文还对碳纤维在航空航... 本文阐述了碳纤维实验室制备过程并计算了其热导率,实验过程是围绕静电纺丝技术制备碳纤维展开的(所有制备设备和材料均来源于内蒙古工业大学化工学院实验室),静电纺丝技术在制备复合纤维方面是有独特的优势的。本文还对碳纤维在航空航天以及汽车制造,建筑领域,医疗器械领域和体育用品领域的应用进行了详细分析和展望。 展开更多
关键词 前驱体纺丝溶液 静电纺丝 碳纳米纤维
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Mathematical Wave Functions and 3D Finite Element Modelling of the Electron and Positron
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作者 Declan Traill 《Journal of Applied Mathematics and Physics》 2024年第4期1134-1162,共29页
The wave/particle duality of particles in Physics is well known. Particles have properties that uniquely characterize them from one another, such as mass, charge and spin. Charged particles have associated Electric an... The wave/particle duality of particles in Physics is well known. Particles have properties that uniquely characterize them from one another, such as mass, charge and spin. Charged particles have associated Electric and Magnetic fields. Also, every moving particle has a De Broglie wavelength determined by its mass and velocity. This paper shows that all of these properties of a particle can be derived from a single wave function equation for that particle. Wave functions for the Electron and the Positron are presented and principles are provided that can be used to calculate the wave functions of all the fundamental particles in Physics. Fundamental particles such as electrons and positrons are considered to be point particles in the Standard Model of Physics and are not considered to have a structure. This paper demonstrates that they do indeed have structure and that this structure extends into the space around the particle’s center (in fact, they have infinite extent), but with rapidly diminishing energy density with the distance from that center. The particles are formed from Electromagnetic standing waves, which are stable solutions to the Schrödinger and Classical wave equations. This stable structure therefore accounts for both the wave and particle nature of these particles. In fact, all of their properties such as mass, spin and electric charge, can be accounted for from this structure. These particle properties appear to originate from a single point at the center of the wave function structure, in the same sort of way that the Shell theorem of gravity causes the gravity of a body to appear to all originate from a central point. This paper represents the first two fully characterized fundamental particles, with a complete description of their structure and properties, built up from the underlying Electromagnetic waves that comprise these and all fundamental particles. 展开更多
关键词 ELECTRON POSITRON Wave Function solution Electromagnetic spin Mass Charge Proof Fundamental Particle Properties Quantum Mechanics Classical Physics Computer 3D Model Schrödinger Equation RMS KLEIN GORDON Electric Magnetic Lorentz Invariant Hertzian Vector Point Potential Field Density Phase Flow Attraction REPULSION Shell Theorem Ehrenfest VIRIAL Normalization Harmonic Oscillator
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Polycaprolactone/polyvinyl pyrrolidone nanofibers developed by solution blow spinning for encapsulation of chlorogenic acid
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作者 Yang Cao Chaoyi Shen +3 位作者 Zhichao Yang Zihan Cai Zian Deng Di Wu 《Food Quality and Safety》 SCIE CSCD 2022年第2期265-274,共10页
Study on the application of nanofibers in food active packaging has been a research hotspot in recent years.In this work,solution blow spinning(SBS)was applied to rapidly fabricate the polycaprolactone(PCL),polyvinyl ... Study on the application of nanofibers in food active packaging has been a research hotspot in recent years.In this work,solution blow spinning(SBS)was applied to rapidly fabricate the polycaprolactone(PCL),polyvinyl pyrrolidone(PVP),and PCL/PVP nanofibrous films to encapsulate chlorogenic acid(CGA).All films showed uniform and smooth nanofibers,and the Fourier transform infrared spectroscopy and X-ray diffraction proved the success of mixed spinning of PCL and PVP.With the increase of PVP content,the thermal stability of the PCL/PVP nanofibrous films improved.The PCL/PVP(weight ratio of 4:1)film possessed better mechanical properties than PCL and PVP films be-cause of the stronger fiber-fiber interactions.The addition of PCL endowed the hydrophobic surfaces to the PCL/PVP films,and the PCL/PVP films had better water vapor barrier ability.The PCL/PVP(4:1)film exhibited the best long-term continuous release of CGA during 72 h.The PVP nanofibrous film exhibited no inhibition against Staphylococcus aureus and Escherichia coli due to the low encapsulation efficiency,but the PCL and PCL/PVP films exhibited good antimicrobial activity.The above results suggested that the nanofibrous fims developed by SBS possess promising prospects in food packaging. 展开更多
关键词 solution blow spinning POLYCAPROLACTONE polvinyl prrolidone chlorogenic acid long-term continuous release
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负载百里酚的聚己内酯纳米纤维膜制备及保鲜应用研究 被引量:2
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作者 金蓉 蔡子涵 +4 位作者 赵以勒 沈超怡 杨智超 吴迪 陈昆松 《浙江大学学报(农业与生命科学版)》 CAS CSCD 北大核心 2023年第3期368-375,共8页
现有的传统活性保鲜包装存在孔隙率低、透气性差等缺点,因此制备纳米级保鲜控释包装材料是果蔬采后贮藏和物流领域中的研究热点。本研究采用溶液吹塑纺丝技术制备负载百里酚(thymol, THY)的聚己内酯(polycaprolactone, PCL)纳米纤维膜,... 现有的传统活性保鲜包装存在孔隙率低、透气性差等缺点,因此制备纳米级保鲜控释包装材料是果蔬采后贮藏和物流领域中的研究热点。本研究采用溶液吹塑纺丝技术制备负载百里酚(thymol, THY)的聚己内酯(polycaprolactone, PCL)纳米纤维膜,并通过材料表征和抑菌实验对THY/PCL纳米纤维膜的性能进行评价。结果表明:负载THY后,PCL纳米纤维膜的结晶度降低,热稳定性提高,而水蒸气透过性能、表面疏水性与机械性能未受影响。此外,THY/PCL纳米纤维膜对大肠埃希菌和金黄色葡萄球菌表现出良好的抑菌活性,展现了在果蔬采后保鲜领域良好的应用前景。 展开更多
关键词 溶液吹塑纺丝 纳米纤维 百里酚 聚己内酯 果蔬 抑菌
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生物基聚乳酸纤维制备与应用前景分析 被引量:4
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作者 谭文萍 马小英 +2 位作者 张倩 宁新 明津法 《棉纺织技术》 CAS 北大核心 2023年第4期73-78,共6页
探讨生物基聚乳酸纤维制备、应用及回收策略问题。综述了生物基聚乳酸材料制备方法特点,对聚乳酸纤维的制备方法进行了分析,包括熔融纺丝、溶液纺丝和静电纺丝。总结了近年来聚乳酸纤维在生物医学、过滤与分离、包装等领域的应用研究进... 探讨生物基聚乳酸纤维制备、应用及回收策略问题。综述了生物基聚乳酸材料制备方法特点,对聚乳酸纤维的制备方法进行了分析,包括熔融纺丝、溶液纺丝和静电纺丝。总结了近年来聚乳酸纤维在生物医学、过滤与分离、包装等领域的应用研究进展以及其回收利用策略。聚焦聚乳酸纤维材料及其制品的开发,提出了生物基聚乳酸纤维成形和应用上尚需研究的理论方案和技术措施。认为:生物基聚乳酸具有环境友好性,随着技术发展、产能增加、成本降低,生物基聚乳酸纤维材料在生物医疗、过滤与分离、包装等领域展现出良好的应用前景。 展开更多
关键词 生物基 聚乳酸纤维 熔融纺丝 溶液纺丝 生物医学 过滤与分离 包装 回收
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浓度及溶剂配比对PVDF静电纺纳米纤维膜的影响 被引量:2
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作者 布热比耶·玉苏普 李新梅 +1 位作者 王晓辉 杨睿 《化工新型材料》 CAS CSCD 北大核心 2023年第10期116-120,共5页
以聚偏氟乙烯(PVDF)为纺丝溶质,N,N-二甲基甲酰胺(DMF)与四氢呋喃(THF)为混合溶剂,配制不同浓度和不同溶剂配比的纺丝溶液,利用静电纺丝技术制备了PVDF纳米纤维膜。通过扫描电子显微镜(SEM)、光学接触角测量仪、ImageJ软件对所制纳米纤... 以聚偏氟乙烯(PVDF)为纺丝溶质,N,N-二甲基甲酰胺(DMF)与四氢呋喃(THF)为混合溶剂,配制不同浓度和不同溶剂配比的纺丝溶液,利用静电纺丝技术制备了PVDF纳米纤维膜。通过扫描电子显微镜(SEM)、光学接触角测量仪、ImageJ软件对所制纳米纤维膜的微观形貌、疏水性能、纤维直径等进行分析,研究了不同浓度和不同溶剂配比对纳米纤维膜的影响。结果表明:当溶液浓度为10%(PVDF质量分数),DMF/THF溶剂配比为3/2时静电纺丝制备的纳米纤维膜纤维形貌良好,直径分布均匀,具有良好的疏水效果。 展开更多
关键词 静电纺丝 聚偏氟乙烯 纺丝液浓度 溶剂配比
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氧化铝超细纤维的制备方法及应用研究现状 被引量:2
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作者 张恒飞 王东哲 +3 位作者 刘茂举 付玉 庄锐 陈代荣 《合成纤维工业》 CAS 2023年第1期68-74,共7页
详述了氧化铝(Al_(2)O_(3))超细纤维的制备方法、各方法的优缺点,以及各方法的工艺参数对纤维形貌和性能的影响,简述了Al_(2)O_(3)超细纤维的应用现状,并对今后Al_(2)O_(3)超细纤维的研发提出建议。Al_(2)O_(3)超细纤维的制备方法主要... 详述了氧化铝(Al_(2)O_(3))超细纤维的制备方法、各方法的优缺点,以及各方法的工艺参数对纤维形貌和性能的影响,简述了Al_(2)O_(3)超细纤维的应用现状,并对今后Al_(2)O_(3)超细纤维的研发提出建议。Al_(2)O_(3)超细纤维的制备方法主要包括离心纺丝、静电纺丝、溶液喷射纺丝及静电-溶液喷射纺丝,其中静电-溶液喷射纺丝法生产Al_(2)O_(3)超细纤维质量好、生产效率高,将来最有可能实现工业化生产。Al_(2)O_(3)超细纤维主要应用在吸附过滤、高温隔热、工业催化等领域。目前Al_(2)O_(3)超细纤维还没有实现工业化生产,今后应加强纺丝液的稳定性研究,加快大规模连续化稳定生产Al_(2)O_(3)超细纤维的装置研发,加强Al_(2)O_(3)超细纤维在民用市场的应用研究。 展开更多
关键词 氧化铝纤维 超细纤维 离心纺丝 静电纺丝 溶液喷射纺丝 应用
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负载THY/HPβCD的纳米纤维膜制备及保鲜应用研究 被引量:1
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作者 赵以勒 沈超怡 +5 位作者 邬梦露 杨相政 张鹏 李江阔 吴迪 陈昆松 《包装工程》 CAS 北大核心 2023年第1期175-184,共10页
目的 针对果蔬产业对纳米控释保鲜包装材料的需求,制备可持续释放百里酚的抗真菌纳米保鲜材料,避免因百里酚易挥发性导致保鲜效率低的问题。方法 采用溶液吹塑纺丝技术(SBS)制备负载百里酚/2–羟基–β–环糊精(THY/HPβCD)包合物的聚... 目的 针对果蔬产业对纳米控释保鲜包装材料的需求,制备可持续释放百里酚的抗真菌纳米保鲜材料,避免因百里酚易挥发性导致保鲜效率低的问题。方法 采用溶液吹塑纺丝技术(SBS)制备负载百里酚/2–羟基–β–环糊精(THY/HPβCD)包合物的聚己内酯(PCL)纳米纤维膜,并评价其纤维膜性能和对草莓灰霉菌的抑制效果。结果 采用SBS技术可快速制备THY/HPβCD/PCL纳米纤维膜,该膜具有良好的水蒸气渗透性、表面亲水性和热稳定性,在72h内能持续稳定释放百里酚,并可有效抑制接种了灰霉菌的草莓果实的腐烂。结论 制备的THY/HPβCD/PCL纳米纤维膜具有良好的缓释和抗真菌活性,有望应用于果蔬采后贮藏保鲜。 展开更多
关键词 溶液吹塑纺丝 自组装 百里酚 2–羟基–β–环糊精 长效缓释 抗真菌活性 复合纳米纤维膜
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丝胶蛋白-丙烯腈接枝共聚纺丝液制备与纤维性能研究 被引量:1
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作者 王玢岩 曹丽 +2 位作者 程隆棣 赵炯心 张瑞云 《合成技术及应用》 CAS 2023年第3期1-6,共6页
研究了丝胶蛋白与丙烯腈通过自由基聚合接枝共聚制备纺丝液的方法,并测定聚合物中丝胶蛋白接枝效率和纺丝液的黏温曲线。通过红外光谱和X射线衍射分析共聚物和纤维的特征峰和结晶度,通过纤维强力仪、烘箱干燥和酸碱液浸泡测试纤维的强... 研究了丝胶蛋白与丙烯腈通过自由基聚合接枝共聚制备纺丝液的方法,并测定聚合物中丝胶蛋白接枝效率和纺丝液的黏温曲线。通过红外光谱和X射线衍射分析共聚物和纤维的特征峰和结晶度,通过纤维强力仪、烘箱干燥和酸碱液浸泡测试纤维的强伸性能、回潮率和耐酸碱性。结果表明:反应6 h,丝胶蛋白接枝效率基本保持稳定;温度在40~50℃之间,纺丝液的黏流性能最利于纺丝;共聚物红外光谱图中含有丝胶蛋白与丙烯腈的特征峰;X射线衍射分析得出接枝前后聚丙烯腈的内部结晶结构未被破坏,且丝胶含量越高结晶度越低;纤维的断裂强度达4.01 cN/dtex、断裂伸长率为45.75%,回潮率为5.8%,不耐长时间的高温强酸强碱处理。 展开更多
关键词 丝胶蛋白 丙烯腈 自由基聚合 纺丝液
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