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Influence of surface modification of SrFe12O19 particles with oleic acid on magnetic microsphere preparation

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Particuology 2008年第3期6卷 185-190页

作者： Sifang Kong Peipei Zhang Xiufang Wen pihui pi Jiang Cheng Zhuoru Yang Jing Hai School of Chemical and Energy Engineering South China University of Technology Guangzhou 501640 China South China Institute of Environmental Sciences SEPA Guangzhou 510655 China

Oleic acid was used as surface modification agent to improve the hydrophobicity of magnetic strontium hexaferrite particles. The structure and properties of treated magnetic particles were characterized by scanning electronic microscopy （SEM）, Fourier transform infrared spectra （FTIR）, powder X-ray diffraction （XRD） and magnetic property measurement system （MPMS）. The results show that oleic acid is chemically enwrapped on the surface of SrFe12O19 particles. Magnetic particles modified by oleic acid are highly dispersible and strongly responsive to magnetism but with slight decrease in saturated magnetization. The affinity between magnetic particles and monomers is improved by surface modification, resulting in increased particle incorporation in magnetic polymeric microspheres. The surface modification mechanism of magnetic particles by oleic acid is addressed in this work.

关键词： Oleic acid Surface modification mechanism Strontium hexaferrite Dispersibility Magnetic polymeric microsphere

Morphologies and Superhydrophobicity of Hybrid Film Surfaces Based on Silica and Fluoropolymer

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Journal of Materials Science & Technology 2008年第5期24卷 693-699页

作者： Ailan QU Xiufang WEN pihui pi Jiang CHENG Zhuoru YANG School of-Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Fluoropolymer and different kinds of silica particles were used for controlling surface chemistry and morphology, respectively. A superhydrophobic surface originated from strawberry-like or quincunx-shaped composite silica particles was obtained. The dual size particles are obtained by utilizing the graft of different modified silica particles with epoxy functional group and amine functional group, This makes the surface of film form a composite interface to have irregular binary structure which plays an essential role in trapping air between the substrate surface and the liquid droplets to be necessary for high contact angle and low contact angle hysteresis. The maximum contact angle for water on the hybrid film is about 174±2° and the contact angle hysteresis is less than 2°. The surface morphologies, roughness and the wettability on the surface of films containing different structural silica particles were compared. It was shown that the hierarchical irregularly structure with a low roughness factor and high air-trapped ratio is indispensable for superhydrophobic surface. Although this structural surfaces based on composite silica particles play a vital role in governing the surface wettability, it is necessary to combine with a low surface energy to make the surface superhydrophobic.

关键词： Superhydrophobicity Hierarchical irregularly structure Silica particles Fluoropolymer

Preparation and characterization of porous titania-grafted poly(styrene-divinylbenzene)/maleic anhydride nanocomposite microspheres

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Science China Chemistry 2010年第3期53卷 604-610页

作者： Li Sen Wang Kuan Zhang ZhiRen Song ChunLian Cheng Jiang Yang ZhuoRu Wen XiuFang pi pihui Harbin Med Coll Dept Pharm Daqing 163319 Peoples R China Harbin Med Coll Dept Pharm Affiliated Hosp 2 Minist Myocardial Ischemia & TreatmentKey Labs E Harbin 150086 Peoples R China Harbin Med Coll Dept Cardiol Affiliated Hosp 2 Minist Myocardial Ischemia & TreatmentKey Labs E Harbin 150086 Peoples R China Jixi Univ Dept Safety & Environm Engn Jixi 158100 Peoples R China S China Univ Technol Sch Chem & Energy Engn Guangzhou 510640 Peoples R China

Mesoporous titania-grafted poly(styrene-divinylbenzene)/maleic anhydride [P(St-DVB)/MA] nanocomposite microspheres were prepared by an open ring reaction method.The titania nanoparticles were first modified by attachment of amino groups to their surface to prevent particle aggregation,and to allow the nanoparticles to covalently bond the polymer microspheres,the surface of which was modified by attachment of MA functional groups to enable the polymer to retain their porous structures and to react with the amino groups on the surface of the titania particles.The porous nanocomposite microspheres were detected by FTIR,SEM,TEM,XRD and UV-Vis spectrophotometry.The results indicated that the nanocomposite microspheres were composed of nanosized titania uniformly distributed on the surface,and exhibited better UV absorbing property than pure polymer microspheres or unmodified titania.Furthermore,compared with pure porous polymer microspheres,the nanocomposite microspheres showed more efficient UV protection and slow release of Parsol-1789(a photo-reactive and cosmetic agent) held inside the porous network of the microspheres.

关键词： porous titania poly(styrene-divinylbenzene) maleic anhydride nanocomposite

特殊浸润性材料在防治油气管道中水合物成核与聚集的应用

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化工进展 2023年第8期42卷 4076-4092页

作者：尹新宇皮丕辉文秀芳钱宇广东省绿色化学品重点实验室华南理工大学化学与化工学院广东广州510640

天然气水合物是一种绿色化石能源,但是在石油和天然气开采、管道运输过程中,管道内形成的水合物会聚集堵塞管道,对油气管道安全储运带来严峻挑战。首先,本文结合国内外关于防治水合物成核与聚集的实验和分子模拟研究成果,介绍了不同运... 详细信息

天然气水合物是一种绿色化石能源,但是在石油和天然气开采、管道运输过程中,管道内形成的水合物会聚集堵塞管道,对油气管道安全储运带来严峻挑战。首先,本文结合国内外关于防治水合物成核与聚集的实验和分子模拟研究成果,介绍了不同运输体系中天然气水合物成核、聚集过程以及影响因素,回顾了传统防治天然气水合物成核与聚集方法及其利弊。其次,阐述了特殊浸润性材料基本概念以及在油气相关领域的应用,并着重梳理了其在抑制天然气水合物成核与防止天然气水合物黏附聚集管壁等方面的研究进展。分析了不同运输体系中特殊浸润性材料在应对天然气水合物成核与聚集应用过程中存在的挑战,并对其提出针对性解决设想。最后,对特殊浸润性材料应对水合物成核与聚集领域的未来发展趋势进行了展望。

关键词：特殊润湿性纳米材料水合物成核团聚

Synthesis and Characterization of Suspension Polymerized Styrene-Divinylbenzene Porous Microsphere Using as Slow-Release-Active Carrier

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Chinese Journal of Chemical Engineering 2006年第4X期14卷 471-477页

作者：李璐程江文秀芳皮丕辉杨卓如 School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Functional porous microspheres used for the slow release carrier of actives in cosmetics or pharmaceuticals were prepared by modified suspension polymerization of styrene (ST) with divinylbenzene (DVB) in the presence of toluene, cyclohexanol and heptane as porogenic diluents. The use of ultrasonic dispersion decreases the beads' size and improves the uniformity. The effects of the porogen mixture, DVB content and solvent extraction on the surface performance of the synthesized beads were studied. The microspheres were characterized by scanning electron microscopy (SEM) and BET surface area determination. It was found that a great proportion of the non-solvating porogen increases the pore diameter and the specific surface area. High DVB concentration also results in the great specific surface area and porosity. When the ratio of toluene/cyclohexanol is 1:2, DVB content is at the range of 40%–60% and methylene chloride was used as extractant, the beads with good spherical shape and pore size were obtained. The prepared porous microspheres were applied as active carriers and showed satisfactory slow release effect. Over 10h constantly sustained release was observed in vitro releasing test for hydroquinone-loaded microspheres. Great surface area promoted high concentration of released hydroquinone.

关键词： porous microsphere suspension polymerization ultrasonic dispersion slow release

Preparation of Nanometer TiO2 Particles with Pure Rutile Phase by Hydrolysis of TiCl4 in Aqueous Solution

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Preparation of Nanometer TiO2 Particles with Pure Rutile Pha...

The Sixth International Conference on Measurement and Control of Granular Materials

作者： Cheng Jiang pi pihui Nong Yunjin Yang Zhuoru College of Chemical Engineering,South China University of Technology Guangzhou 510640,China

Nanometer TiO particles with pure rutile phase were prepared by hydrolysis of TiCl aqueous solution in the presence of acid HCl in an agitated reactor at 80℃ within 3 h with subsequent ethanol rinsing for dehydration and sintering for crystalline phase transformation. XRD patterns show that anatase TiO may be completely transformed into pure rutile phase at a relative low temperature of 500℃,which is much lower than the conventionally reported transition temperature during calcination.The TiO particles obtained in this study were shaped in ellipse with the primary size of 20～35nm from TEM and XRD analysis,BET surface area was 170 mgfor TiO powders without sintering and 110 mgcalcinated at 500℃ for 2 h.

关键词： Preparation nanoparticle titanium dioxide hydrolysis

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聚苯醚/环氧体系非等温固化行为及固化工艺

化工学报 2007年第7期58卷 1875-1879页

作者：文秀芳田勇皮丕辉程江杨卓如华南理工大学化工与能源学院广东广州510640

采用程序升温差示扫描量热仪(DSC)法,用Kissinger方程研究了聚苯醚(PPE)/环氧(EP)体系不同配比混合物的固化反应动力学特征。非等温DSC研究表明PPE/EP体系的固化反应过程比较复杂,其动力学参数受PPE含量的影响较大,PPE/EP混合物的固化... 详细信息

采用程序升温差示扫描量热仪(DSC)法,用Kissinger方程研究了聚苯醚(PPE)/环氧(EP)体系不同配比混合物的固化反应动力学特征。非等温DSC研究表明PPE/EP体系的固化反应过程比较复杂,其动力学参数受PPE含量的影响较大,PPE/EP混合物的固化反应起始温度随PPE含量的增大而增大,最大放热峰的峰温均随着PPE含量的增加而减小。Kissinger法计算得到PPE/EP体系10%PPE、20%PPE、40%PPE含量(质量)的表观活化能依次为63.88、55.37、47.31kJ.mol-1,说明PPE可以促进环氧树脂的固化反应。在此基础上,以20%PPE/EP体系为例,采用T-β图外推法,得到了其固化工艺。

关键词：聚苯醚树脂环氧树脂非等温固化

磁性多孔γ-Fe_2O_3/P(St-DVB-MAA)聚合物微球的制备及其表征

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高分子学报 2008年第2期18卷 168-173页

作者：孔丝纺文秀芳皮丕辉程江杨卓如华南理工大学化工与能源学院广州510640

以油酸包裹的γ-Fe2O3为磁性来源，选用苯乙烯（St）、二乙烯苯（DVB）和甲基丙烯酸（MAA）为共聚单体，通过改进的悬浮聚合法，制备了表面含有羧基的多孔磁性高分子微球，利用红外光谱（FTIR）、扫描电子显微镜（SEM）、光学显微镜以... 详细信息

以油酸包裹的γ-Fe2O3为磁性来源，选用苯乙烯（St）、二乙烯苯（DVB）和甲基丙烯酸（MAA）为共聚单体，通过改进的悬浮聚合法，制备了表面含有羧基的多孔磁性高分子微球，利用红外光谱（FTIR）、扫描电子显微镜（SEM）、光学显微镜以及热重分析仪（TG）等对聚合物进行了性能表征,FTIR和光学显微镜结果分析表明，苯乙烯、二乙烯苯和甲基丙烯酸在磁性粒子的表面发生了聚合反应，生成了聚合物包埋磁粉的磁性聚合物复合微球，且微球表面含有羧基；SEM和光学显微镜分析测试结果显示合成的磁性γ-Fe2O3／P（St-DVB—MAA）复合粒子呈球形，微球具有多孔结构，且微球之间不发生团聚，微球粒子粒径分布均匀，大多数粒子粒径分布在0．4～0．9mm之间；TG测试的结果表明，磁性γ-Fe2O3被包覆在聚合物微球之中，且磁性粒子在微球中的包覆率达到12．12％。

关键词：羧基多孔悬浮聚合磁性聚合物微球

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特殊润湿性油水分离材料的开发与研究

化学进展 2018年第1期30卷 73-86页

作者：曾新娟王丽皮丕辉程江文秀芳钱宇华南理工大学化学与化工学院广州510640 环境保护部华南环境科学研究所广州510655

随着工业的发展,油水污染日渐严重,特别是石油的泄露、有机化学品的排放对生态环境造成了难以挽救的损害。因此,开发新型高效的油水分离材料与技术是一个极为重要的任务。特殊润湿性油水分离材料的出现,为科研人员指明了道路。本文以用... 详细信息

随着工业的发展,油水污染日渐严重,特别是石油的泄露、有机化学品的排放对生态环境造成了难以挽救的损害。因此,开发新型高效的油水分离材料与技术是一个极为重要的任务。特殊润湿性油水分离材料的出现,为科研人员指明了道路。本文以用于油水分离的特殊润湿性材料为研究体系;首先,对具有特殊润湿性油水分离材料的基本理论和设计理念进行分析;然后介绍了通过调控材料表面的微观结构和表面化学组成制备特殊润湿性材料实现不同的油水分离效果的研究进展,并且尝试从微纳米尺度上揭示特殊润湿性材料的特征,形成从微纳米尺度上揭示油水分离用材料化学品结构特征的技术基础。最后指出了目前在油水分离用功能材料化学品这一领域存在的一些问题,并对这一领域的发展趋势进行展望。

关键词：特殊润湿性油水分离化学产品工程微纳米尺度结构性能关系