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Strengthening of polysulfone membranes using hybrid mixtures of micro- and nano-scale modifiers

Peyman P. Selakjani, Majid Peyravi, Mohsen Jahanshahi, Hamzeh Hoseinpour, Ali S. Rad, Soodabeh Khalili

《化学科学与工程前沿（英文）》 2018年 第12卷 第1期   页码 174-183 doi: 10.1007/s11705-017-1670-y

摘要： Polysulfone (PSf) membranes were modified by either a new organic modifier (sulfonated poly(ether sulfide sulfone), SPESS) or a traditional modifier (rice hulk). These membranes were further reinforced with either multi-walled carbon nanotubes (MWCNTs) or silica nanoparticles. Having a dye rejection of 98.46%, the reinforced membranes increased more than 50% in strength but no change in solution flux was observed. The morphological and roughness studies were conducted using scanning electron microscopy and atomic force microscopy. Moreover, the PSF membranes were also characterized by differential scanning calorimetry. Modifying the membranes with organic modifier or nanofiller increases the glass transition temperature ( ). The highest and strength were observed for the PSf-SPESS-MWCNT membrane. SPESS decreases surface roughness but MWCNT increases roughness on the nanoscale. All membranes show a bimodal pore size distribution, whereas the PSf-SPESS-MWCNT membrane exhibits a relatively uniform distribution of macroscopic and microscopic pores.

关键词： polysulfone membrane     mechanical properties     micro- and nano-modification     binary and ternary system     dye removal    

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Recent advances in micro- and nano-machining technologies

Shang GAO, Han HUANG

《机械工程前沿（英文）》 2017年 第12卷 第1期   页码 18-32 doi: 10.1007/s11465-017-0410-9

摘要：

Device miniaturization is an emerging advanced technology in the 21st century. The miniaturization of devices in different fields requires production of micro- and nano-scale components. The features of these components range from the sub-micron to a few hundred microns with high tolerance to many engineering materials. These fields mainly include optics, electronics, medicine, bio-technology, communications, and avionics. This paper reviewed the recent advances in micro- and nano-machining technologies, including micro-cutting, micro-electrical-discharge machining, laser micro-machining, and focused ion beam machining. The four machining technologies were also compared in terms of machining efficiency, workpiece materials being machined, minimum feature size, maximum aspect ratio, and surface finish.

关键词： micro machining     cutting     electro discharge machining (EDM)     laser machining     focused ion beam (FIB)    

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Occurrence and distribution of micro- and mesoplastics in the high-latitude nature reserve, northern

《环境科学与工程前沿（英文）》 2022年 第16卷 第9期 doi: 10.1007/s11783-022-1534-7

摘要：

• The first study on micro(meso)plastics (MMPs) in the Liaohe River Reserve is reported.

关键词： Microplastics     Mesoplastics     Water     Sediment     Characteristic     Risk Assessment    

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Bicontinuous porous membranes with micro-nano composite structure using a facile atomization-assisted

《化学科学与工程前沿（英文）》 2022年 第16卷 第8期   页码 1268-1280 doi: 10.1007/s11705-022-2143-5

摘要： The micro-nano composite structure can endow separation membranes with special surface properties, but it often has the problems of inefficient preparation process and poor structural stability. In this work, a novel atomization-assisted nonsolvent induced phase separation method, which is also highly efficient and very simple, has been developed. By using this method, a bicontinuous porous microfiltration membrane with robust micro-nano composite structure was obtained via commercially available polymers of polyacrylonitrile and polyvinylpyrrolidone. The formation mechanism of the micro-nano composite structure was proposed. The microphase separation of polyacrylonitrile and polyvinylpyrrolidone components during the atomization pretreatment process and the hydrogen bonding between polyacrylonitrile and polyvinylpyrrolidone molecules should have resulted in the nano-protrusions on the membrane skeleton. The membrane exhibits superhydrophilicity in air and superoleophobicity underwater. The membrane can separate both surfactant-free and surfactant-stabilized oil-in-water emulsions with high separation efficiency and permeation flux. With excellent antifouling property and robust microstructure, the membrane can easily be recycled for long-term separation. Furthermore, the scale-up verification from laboratory preparation to continuous production has been achieved. The simple, efficient, cost-effective preparation method and excellent membrane properties indicate the great potential of the developed membranes in practical applications.

关键词： atomization     nonsolvent induced phase separation     bicontinuous porous structure     micro-nano composite structure     oil-water separation    

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Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

Shaolin XU,Tsunemoto KURIYAGAWA,Keita SHIMADA,Masayoshi MIZUTANI

《机械工程前沿（英文）》 2017年 第12卷 第1期   页码 33-45 doi: 10.1007/s11465-017-0422-5

摘要：

In this paper, the state of art of ultrasonic-assisted machining technologies used for fabrication of micro/nano-textured surfaces is reviewed. Diamond machining is the most widely used method in industry for manufacturing precision parts. For fabrication of fine structures on surfaces, conventional diamond machining methods are competitive by considering the precision of structures, but have limitations at machinable structures and machining efficiency, which have been proved to be partly solved by the integration of ultrasonic vibration motion. In this paper, existing ultrasonic-assisted machining methods for fabricating fine surface structures are reviewed and classified, and a rotary ultrasonic texturing (RUT) technology is mainly introduced by presenting the construction of vibration spindles, the texturing principles, and the applications of textured surfaces. Some new ideas and experimental results are presented. Finally, the challenges in using the RUT method to fabricate micro/nano-textured surfaces are discussed with respect to texturing strategies, machinable structures, and tool wear.

关键词： ultrasonic-assisted machining     textured surface     micro/nano-structures     functional performance    

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Fabrication of micro/nano-structures by electrohydrodynamic jet technique

Dazhi WANG, Xiaojun ZHAO, Yigao LIN, Tongqun REN, Junsheng LIANG, Chong LIU, Liding WANG

《机械工程前沿（英文）》 2017年 第12卷 第4期   页码 477-489 doi: 10.1007/s11465-017-0461-y

摘要：

Electrohydrodynamic jet (E-Jet) is an approach to the fabrication of micro/nano-structures by the use of electrical forces. In this process, the liquid is subjected to electrical and mechanical forces to form a liquid jet, which is further disintegrated into droplets. The major advantage of the E-Jet technique is that the sizes of the jet formed can be at the nanoscale far smaller than the nozzle size, which can realize high printing resolution with less risk of nozzle blockage. The E-Jet technique, which mainly includes E-Jet deposition and E-Jet printing, has a wide range of applications in the fabrication of micro/nano-structures for micro/nano-electromechanical system devices. This technique is also considered a micro/nano-fabrication method with a great potential for commercial use. This study mainly reviews the E-Jet deposition/printing fundamentals, fabrication process, and applications.

关键词： electrohydrodynamic jet deposition     electrohydrodynamic jet printing     micro/nano-structures     film    

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Optimizing the compressive strength of concrete containing micro-silica, nano-silica, and polypropylene

Fatemeh ZAHIRI, Hamid ESKANDARI-NADDAF

《结构与土木工程前沿（英文）》 2019年 第13卷 第4期   页码 821-830 doi: 10.1007/s11709-019-0518-6

摘要： Many studies have evaluated the effects of additives such as nano-silica (NS), micro-silica (MS) and polymer fibers on optimizing the mechanical properties of concrete, such as compressive strength. Nowadays, with progress in cement industry provides, it has become possible to produce cement type I with strength classes of 32.5, 42.5, and 52.5 MPa. On the one hand, the microstructure of cement has changed, and modified by NS, MS, and polymers; therefore it is very important to determine the optimal percentage of each additives for those CSCs. In this study, 12 mix designs containing different percentages of MS, NS, and polymer fibers in three cement strength classes(CSCs) (32.5, 42.5, and 52.5 MPa) were designed and constructed based on the mixture method. Results indicated the sensitivity of each CSCs can be different on the NS or MS in compressive strength of concrete. Consequently, strength classes have a significant effect on the amount of MS and NS in mix design of concrete. While, polymer fibers don’t have significant effect in compressive strength considering CSCs.

关键词： mixture method     compressive strength     nano-silica     micro-silica     polypropylene fibers    

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微纳操作与表征

Yu Sun, Sergej Fatikow, Xinyu Liu

《工程（英文）》 2023年 第24卷 第5期   页码 1-2 doi: 10.1016/j.eng.2023.04.006

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Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation

《环境科学与工程前沿（英文）》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1712-2

摘要：

● Both amorphous and crystalline silicon are completely separated from coal fly ash.

关键词： Coal fly ash     Alkali fusion     Micro-/meso-porous Si     Zeolite MCM-48     Crystalline transformation    

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载有穿心莲内酯的微乳液和纳米乳液制剂——改善“苦味之王” 的生物利用度、靶组织分布及功效 Review

Marta Casamonti, Laura Risaliti, Giulia Vanti, Veri Piazzini, Maria Camilla Bergonzi, Anna Rita Bilia

《工程（英文）》 2019年 第5卷 第1期   页码 69-75 doi: 10.1016/j.eng.2018.12.004

摘要：

穿心莲内酯（AG）为爵床科植物穿心莲（Andrographis paniculata）的特征性成分。该植物为亚洲著名药用植物，在印度、中国和泰国得到广泛使用。《中华人民共和国药典》（简称《中国药典》）收载了中药穿心莲的药材标准，记载这种草药的煎剂可“清热、解毒、消肿”。穿心莲具有众多潜在活性，从抗炎到抗糖尿病作用，从神经保护到抗肿瘤活性，从保肝到抗肥胖特性。然而，AG的生物利用度较低、水溶性较差，因此限制了给药后在体内的分布和积累。此外，AG在胃肠道碱性和酸性环境中不稳定，据报道其半衰期极为短暂。在为提高AG的水溶性和渗透性而采取的各种策略中，技术途径是开发适合的给药系统最有用的方法。本文综述了与载有AG的微粒（MP）和纳米颗粒（NP）相关的已有研究工作。目前已开发出基于聚乳酸- 羟基乙酸（PLGA）、海藻酸和葡聚糖衍生物的微粒，分别用于肠胃外口服和肺部给药。NP包括囊泡（脂质体和类脂质体）、聚合NP（基于聚乙烯醇、聚合苯基硼酸、PLGA、人血清白蛋白、聚氰基丙烯酸乙酯和聚合物胶束）、固体脂质NP、微乳液（ME）和纳米乳液（NE）、黄金NP、纳米晶体和纳米混悬液。据报道，所述载有AG的给药系统的生物利用度、靶组织分布和功效都得到了优化。

关键词： 穿心莲     爵床科     穿心莲内酯     给药系统     微粒子和纳米颗粒     提高生物利用度     靶组织分布    

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纳卫星微型百叶窗热控技术研究及仿真

杨娟,李运泽,王浚

《中国工程科学》 2008年 第10卷 第7期   页码 169-172

摘要：

微型百叶窗能够适当解决因体积及质量限制而引起的纳卫星内部热环境高热流密度问题。微型百 叶窗驱动的智能化控制方法是亟待解决的关键技术。在球状纳卫星动态特性模型的基础上，提出了一种模 糊PI 混合控制方法。分别在舱内仪器散热增加和减少的工况下进行控制仿真。结果表明，这种并联控制系 统较之单独使用模糊控制器和传统PID控制器在控制效果和动态特性方面更佳。

关键词： 纳卫星     微型百叶窗     模糊PI 控制器     仿真    

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磁控螺旋形微纳米机器人在生物医学方面的应用 Review

邱发敏, Bradley J. Nelson

《工程（英文）》 2015年 第1卷 第1期   页码 21-26 doi: 10.15302/J-ENG-2015005

摘要：

磁控螺旋形微纳米机器人可在低强度旋转磁场（<10 mT）的驱动下，实现亚微米精度的三维（3D）游动。由于低强度磁场对细胞和组织无害，磁控螺旋形微纳米机器人在生物医学方面有很大的应用前景，如微创手术、细胞操作和分析以及靶向治疗。本文系统介绍了磁控螺旋形微纳米机器人的制造方法、运动控制和生物医学应用。

关键词： 磁控螺旋形微纳米机器人     可游动微纳米机器人     人造细菌鞭毛（ABFs）     功能化     生物医学应用    

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Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process

ZHANG Dongxiang, XUE Min, XU Hang, XU Wenguo, TARASOV V

《化学科学与工程前沿（英文）》 2008年 第2卷 第3期   页码 319-324 doi: 10.1007/s11705-008-0051-y

摘要： Ultra-fine zinc oxalate powders were prepared through a precipitation stripping method with bis(2-ethylhexyl) phosphate (HDEHP) diluted by tetrachloride carbon as the extractant, and oxalic acid ethanol aqueous solution as the re-extractant and precipitator. Zinc oxide powders were obtained by decomposing zinc oxalate powders at 450°C. The prepared zinc oxide powders were characterized by transmission electron microscope (TEM), Scanning electron microscope (SEM), Thermogravimetric analysis (TG), X-ray diffraction (XRD) and Fourier transmission infrared (FT-IR) spectrum. The photocatalytic performance of methylene blue by zinc oxide was studied based on the Langmuir model and Photo-Layer model. The results show that some zinc oxide powders were micro-multipore materials with hexagonal crystal. The particle size was around 32 nm. The photocatalytic process was the control step in the chemical reaction. The photo catalytic process followed pseudo-first order kinetics and •OH concentration inside the photo-layer in different reaction condition were calculated according to the Photo-Layer model.

关键词： 2-ethylhexyl     micro-multipore     Photo-Layer     hexagonal     methylene    

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Study on the surface-modification of nano-hydroxyapatite with lignin and the corresponding nanocomposite

Haojie Ding, Liuyun Jiang, Chunyan Tang, Shuo Tang, Bingli Ma, Na Zhang, Yue Wen, Yan Zhang, Liping Sheng, Shengpei Su, Xiang Hu

《化学科学与工程前沿（英文）》 2021年 第15卷 第3期   页码 630-642 doi: 10.1007/s11705-020-1970-5

摘要： To obtain nano-hydroxyapatite/poly(lactide-co-glycolide) (n-HA/PLGA) nanocomposite with superior mechanical properties, here, lignin was chosen to surface-modify for n-HA through co-precipitation method. The different reaction conditions of reaction time, phosphorus source, and the lignin addition amount were studied by fourier transformation infrared spectra, X-ray diffraction, the intuitionistic dispersion experiment, transmission electron microscope and thermal gravimetric analysis. The reaction mechanism and the best appropriate reaction condition were obtained. More importantly, the results of electromechanical universal tester, scanning electron microscope, differential scanning calorimetric analyzer, polarized optical microscopy and dynamic mechanical analysis confirmed that the obtained n-HA could greatly increase the mechanical strength of PLGA, owing to the excellent dispersion and promotion crystallization effect. Moreover, cell culture experimental results indicated that the n-HA surface-modified by lignin was favorable to improve the cell biocompatibility of PLGA. The study suggested that the introduction of lignin was a novel method to acquire a highly dispersed n-HA, which would provide a new idea to achieve the n-HA/PLGA nanocomposite as bone materials in future, and it would pave the way towards a new application of lignin in biomedical field.

关键词： nanocomposite     poly (lactide-co-glycolide)     hydroxyapatite     mechanical property    

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Parametric study on the mixed solvent synthesis of ZIF-8 nano- and micro-particles for CO adsorption:

Alireza Hadi, Javad Karimi-Sabet, Abolfazl Dastbaz

《化学科学与工程前沿（英文）》 2020年 第14卷 第4期   页码 579-594 doi: 10.1007/s11705-018-1770-3

摘要： The room temperature synthesis of ZIF-8 micro- and nano-particles was investigated using a mixed methanol-water solvent system. ZIF-8 particles of good quality and high crystallinity were obtained. Response surface methodology was used to determine the effect of the synthesis conditions on the ZIF-8 yield, particle size distribution, and mean particle size. The ligand/metal salt molar ratio followed by the amount of sodium formate (the deprotonating agent) and then the amount of water (i.e., the composition of the mixed solvent) respectively had the largest effects on both the ZIF-8 yield and particle size. Results showed that mixing of solvents with different strengths in producing ZIF-8 crystals is a practical method to size-controlled synthesis of ZIF-8 particles. This method is more favorable for industrial-scale ZIF-8 synthesis than using excess amounts of ligands or chemical additives (like sodium formate). In addition, ZIF-8 samples with different mean particle sizes (100, 500, and 1000 nm) were used for CO adsorption and the mid-sized ZIF-8 particles had the highest adsorption capacity.

关键词： metal organic frameworks     zeolitic imidazolate frameworks     ZIF-8     response surface methodology     Box Behnken design     CO adsorption    

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标题 作者 时间 类型 操作

Strengthening of polysulfone membranes using hybrid mixtures of micro- and nano-scale modifiers

Peyman P. Selakjani, Majid Peyravi, Mohsen Jahanshahi, Hamzeh Hoseinpour, Ali S. Rad, Soodabeh Khalili

期刊论文

Recent advances in micro- and nano-machining technologies

Shang GAO, Han HUANG

期刊论文

Occurrence and distribution of micro- and mesoplastics in the high-latitude nature reserve, northern

期刊论文

Bicontinuous porous membranes with micro-nano composite structure using a facile atomization-assisted

期刊论文

Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

Shaolin XU,Tsunemoto KURIYAGAWA,Keita SHIMADA,Masayoshi MIZUTANI

期刊论文

Fabrication of micro/nano-structures by electrohydrodynamic jet technique

Dazhi WANG, Xiaojun ZHAO, Yigao LIN, Tongqun REN, Junsheng LIANG, Chong LIU, Liding WANG

期刊论文

Optimizing the compressive strength of concrete containing micro-silica, nano-silica, and polypropylene

Fatemeh ZAHIRI, Hamid ESKANDARI-NADDAF

期刊论文

微纳操作与表征

Yu Sun, Sergej Fatikow, Xinyu Liu

期刊论文

Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation

期刊论文

载有穿心莲内酯的微乳液和纳米乳液制剂——改善“苦味之王” 的生物利用度、靶组织分布及功效

Marta Casamonti, Laura Risaliti, Giulia Vanti, Veri Piazzini, Maria Camilla Bergonzi, Anna Rita Bilia

期刊论文

纳卫星微型百叶窗热控技术研究及仿真

杨娟,李运泽,王浚

期刊论文

磁控螺旋形微纳米机器人在生物医学方面的应用

邱发敏, Bradley J. Nelson

期刊论文

Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process

ZHANG Dongxiang, XUE Min, XU Hang, XU Wenguo, TARASOV V

期刊论文

Study on the surface-modification of nano-hydroxyapatite with lignin and the corresponding nanocomposite

Haojie Ding, Liuyun Jiang, Chunyan Tang, Shuo Tang, Bingli Ma, Na Zhang, Yue Wen, Yan Zhang, Liping Sheng, Shengpei Su, Xiang Hu

期刊论文

Parametric study on the mixed solvent synthesis of ZIF-8 nano- and micro-particles for CO adsorption:

Alireza Hadi, Javad Karimi-Sabet, Abolfazl Dastbaz

期刊论文