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热致相分离法偏二氯乙烯-氯乙烯共聚物多孔膜的制备及性能 被引量:2
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作者 郑秋光 刘海亮 肖长发 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2019年第4期841-848,共8页
以偏二氯乙烯-氯乙烯共聚物[P(VDC-co-VC)]为成膜聚合物,邻苯二甲酸二甲酯(DMP)为稀释剂,采用热致相分离(TIPS)法制备了具有多孔结构的P(VDC-co-VC)膜.通过聚合物-稀释剂二元体系相图、场发射扫描电镜(FESEM)、差示扫描量热仪(DSC)、X... 以偏二氯乙烯-氯乙烯共聚物[P(VDC-co-VC)]为成膜聚合物,邻苯二甲酸二甲酯(DMP)为稀释剂,采用热致相分离(TIPS)法制备了具有多孔结构的P(VDC-co-VC)膜.通过聚合物-稀释剂二元体系相图、场发射扫描电镜(FESEM)、差示扫描量热仪(DSC)、X射线衍射(XRD)、原子力显微镜(AFM)、纯水通量、接触角、孔径及其分布、截留率及力学性能等研究了聚合物含量对P(VDC-co-VC)多孔膜结构和性能的影响.结果表明,P(VDC-co-VC)-DMP二元体系成膜过程以液-液(L-L)分相为主,随着聚合物含量增加,膜的横截面由类花瓣状结构向胞腔状结构转变,膜的孔连通性降低,结构变得较为致密,同时膜上表面孔隙率降低,粗糙度增大. L-L分相时间和聚合物含量的变化,导致膜结晶度先降低后增大.聚合物含量的增加使膜上表面接触角、断裂强度及蛋白截留率增加,但膜的平均孔径、孔隙率及纯水通量先增加后减小.当聚合物质量分数为30%时,所得膜通透性较优,断裂强度可达7.5MPa. 展开更多
关键词 热致相分离法 偏二氯乙烯-氯乙烯共聚物多孔膜 聚合物含量 液-液分相
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低砷磷生产工艺中分相器的优化技术研究
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作者 王晓静 江增 唐磊 《现代化工》 CAS CSCD 北大核心 2013年第10期128-131,共4页
通过建立计算流体力学模型,采用Fluent软件,选用雷诺应力模型(RSM模型)作为湍流模型对该工艺中的液-液旋流分相器进行流体力学数值模拟,通过数值模拟仿真优化旋流器的各结构参数,同时研究不同操作参数和物性参数对旋流器分离效率的影响... 通过建立计算流体力学模型,采用Fluent软件,选用雷诺应力模型(RSM模型)作为湍流模型对该工艺中的液-液旋流分相器进行流体力学数值模拟,通过数值模拟仿真优化旋流器的各结构参数,同时研究不同操作参数和物性参数对旋流器分离效率的影响,并在此基础上进行结构参数的优化。模拟结果表明,溢流口直径为30 mm,溢流管伸入长度为60 mm,圆柱段长度为80 mm时旋流器分离效率最佳。 展开更多
关键词 黄磷脱砷 -旋流分相 雷诺应力模型(RSM模型) 分离效率 优化
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玻璃分相的电子能量损失谱研究
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作者 陈全庆 褚一鸣 +1 位作者 段晓峰 樊先平 《电子显微学报》 CAS CSCD 1991年第4期443-444,共2页
一、引言:玻璃中液-液分相是材料科学工作者很感兴趣的问题。因为分相在很多玻璃形成系统中发生并影响其微观结构与性质。可应用之于制造微晶玻璃,光色玻璃,微孔玻璃等,亦可因之而造成材料的缺陷使材料质量性质下降。在玻璃分相的热力... 一、引言:玻璃中液-液分相是材料科学工作者很感兴趣的问题。因为分相在很多玻璃形成系统中发生并影响其微观结构与性质。可应用之于制造微晶玻璃,光色玻璃,微孔玻璃等,亦可因之而造成材料的缺陷使材料质量性质下降。在玻璃分相的热力学及动力学研究中主要难题在于测定其分相粒子的尺寸分布及分相玻璃各相的化学成分。分相粒子尺寸约在几个埃至几千埃之间变动。通常应用X射线小角散射法测定其分相粒子尺寸分布。此种方法试样要求较难制备,并要作烦琐的夹缝校正。樊先平、陈全庆曾应用透射电镜成象。 展开更多
关键词 玻璃 液-液分相 能量 损失谱
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Efficiency of Plate Separators for Dispersed Liquid-Liquid Systems 被引量:5
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作者 唐洪涛 吴剑华 《Transactions of Tianjin University》 EI CAS 2006年第5期313-318,共6页
The basic flow model of laminar flow field and the trajectory model of dispersed phase drops are derived. Based on the comparable volumetric flow rate, the dispersed flow rate can be linearly discretized. Consequently... The basic flow model of laminar flow field and the trajectory model of dispersed phase drops are derived. Based on the comparable volumetric flow rate, the dispersed flow rate can be linearly discretized. Consequently, the trajectory of a droplet in the channel can be tracked, and the trajectories of all drops are observed in order to statistically analyse the drops for capture or entrainment. Therefore, in terms of theoretical model of motion, the stratified two phase flow systems are studied in the mixture of nitrobenzene and concentrated sulfuric acid. The analytical results indicate that the trajectories of droplets of different diameters are different at the same location. The larger droplets can help to promote the efficiency of plate separators. The thickness of trickling film has a significant influence on the efficiency of numerical simulation when the concentration of the dispersed phase is greater than 10%. So the modification of thickness of trickling film can help to get the real flow field efficiency. The low flow rate lowers the average Renolds number so that the lighter phase droplets have sufficient time to interact with the trickling film. It is an indispensable factor for predicting efficiency that coalesced drops flow off inclined plates together with trickling films. A comparison confirms that the simulation results are in good agreement with the experiment results. 展开更多
关键词 EFFICIENCY COALESCENCE SEPARATORS DROPS two phase flow
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广钧釉的组成与呈色研究 被引量:5
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作者 杨兆禧 秦武军 +1 位作者 杨兆雄 郑忠 《华南理工大学学报(自然科学版)》 EI CAS CSCD 1996年第3期23-28,共6页
对佛山石湾清代的两个广钧器皿,通过化学全分析和EDAX、DTEM、OM、穆斯鲍尔谱、DTA、XRD等测试方法,研究了它们的组成、显微结构及呈色机理。证实广钧釉是一种石灰釉,而且属低温釉;坯体中含大量的游离石英;其是色... 对佛山石湾清代的两个广钧器皿,通过化学全分析和EDAX、DTEM、OM、穆斯鲍尔谱、DTA、XRD等测试方法,研究了它们的组成、显微结构及呈色机理。证实广钧釉是一种石灰釉,而且属低温釉;坯体中含大量的游离石英;其是色是CU2+和釉中存在液-液分相的结果,分相液滴对白光散射符合瑞利散射条件,使釉显出带乳光性的蓝绿色调。 展开更多
关键词 广钧 显微结构 呈色 液-液分相
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SYNTHESIS AND CHARAOTERIZATION OF NOVEL THERMOTROPIO LIQUID ORYSTALLINE POLYESTERS BEARING NONLINEAR OPTICAL AZOBENZENE SIDE GROUP
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作者 张会旗 张莹 +2 位作者 甘湘萍 阴航明 孙经武 《Transactions of Tianjin University》 EI CAS 1999年第1期93-97,共5页
A series of novel thermotropic liquid crystalline polyesters bearing nonlinear optical azobenzene side group were synthesized by high temperature solution polycondensation and their structures,thermal stability, phas... A series of novel thermotropic liquid crystalline polyesters bearing nonlinear optical azobenzene side group were synthesized by high temperature solution polycondensation and their structures,thermal stability, phase transition behavior and crystallinity were characterized by IR,elemental analysis, TG-DTA, polarizing optical microscope (POM) equipped with a hot stage and X-ray diffraction techniques. The results demonstrate that all the synthesized polyesters exhibit nematic liquid crystalline phases and show relatively high glass transition temperatures and good thermal stability. 展开更多
关键词 AZOBENZENE POLYESTER thermotropic liquid crystalline polymer nematic phase nonlinear optical material
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The Relationship Between Hysteresis and Liquid Flow Distribution in Trickle Beds 被引量:3
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作者 王跃发 毛在砂 陈家镛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 1999年第3期221-229,共9页
Experiments were conducted on a trickle bed with 0.283m ID to elucidate the relationship between hysteretic phenomena and liquid distribution. The hysteresis of pressure drop and the variance of radial liquid distribu... Experiments were conducted on a trickle bed with 0.283m ID to elucidate the relationship between hysteretic phenomena and liquid distribution. The hysteresis of pressure drop and the variance of radial liquid distribution were observed simultaneously. Residence time distribution (RTD), holdup and mean residence time (RT) of liquid phase were also found to demonstrate hysteresis of the same nature. RTD, liquid holdup and mean RT calculated with a simple model from the distribution of liquid flow rate show characteristics consistant with the experimental data, suggesting that the hyteretic phenomena originate from the multiplicity and nonuniformity of liquid flow distribution. 展开更多
关键词 trickle bed liquid distribution HYSTERESIS residence time distribution
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Determination of Cordyceps Sinensis/Betaine Compound Feed Nutriment by HPLC 被引量:1
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作者 陈煜 《Agricultural Science & Technology》 CAS 2012年第6期1363-1364,1367,共3页
[Objective] The aim was to conduct HPLC analysis on Cordyceps Sinensis/Betaine compound feed nutriment. [Method] Cordyceps Sinensis/Betaine compound feed nutriment was under HPLC analysis to determine separation of Co... [Objective] The aim was to conduct HPLC analysis on Cordyceps Sinensis/Betaine compound feed nutriment. [Method] Cordyceps Sinensis/Betaine compound feed nutriment was under HPLC analysis to determine separation of Cordyceps Sinensis effluent and betaine. [Result] Different compositions in Cordyceps Sinensis/etaine compound feed nutriment would be well separated by the method. [Conclusion] The method provides a suitable platform of separation and analysis for Cordyceps Sinensis /Betaine compound feed nutriment. 展开更多
关键词 Cordyceps Sinensis /Betaine Compound Feed Nutriment HPLC SCX
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Ultrafiltration of Shiitake Polyphenol with Ultrasound Enhancement
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作者 Defang SHI Hong GAO +3 位作者 Xiuzhi FAN De YANG Shujing XUE Wei CHENG 《Agricultural Science & Technology》 CAS 2015年第10期2243-2246,共4页
Ultrafiltration (UF) experiments were subjected to the concentration of Shi- itake polyphenol(SP) with ultrasound (US) enhancement, by which the effects of the main parameters such as ultrasonic power, transmemb... Ultrafiltration (UF) experiments were subjected to the concentration of Shi- itake polyphenol(SP) with ultrasound (US) enhancement, by which the effects of the main parameters such as ultrasonic power, transmembrane pressure, temperature and axial flow-rate on the membrane fluxes were analyzed, and then the SP of the ultrafiltrate after follow-up resin adsorption by HPLC was investigated. The results in- dicated that US could significantly enhance the membrane fluxes. The optimal con- ditions obtained was as follows: 0.60 W/cm2 US power, axial flow-rate of 80 L/h, operation temperature 30 ~C, transmembrane pressure 0.10 MPa. US increased the absorption capacity of the absorbent resin during the following stage. The HPLC analysis also showed that catechins were purified to some extent as the ultrafiltrate was treated by US and macroporous resin, indicating the technology of US en- hancement coupled with UF showed the potential for concentration and purification of SP by absorbent resins. 展开更多
关键词 SHIITAKE ULTRAFILTRATION ULTRASOUND
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Economic and Qualitative Traits of Italian Alps Saffron 被引量:1
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作者 Alessandra MANZO Sara PANSERI +1 位作者 Danilo BERTONI Annamaria GIORGI 《Journal of Mountain Science》 SCIE CSCD 2015年第6期1542-1550,共9页
Saffron, obtained from the flower stigmas of Crocus sativus L., is one of the most expensive food spices. The introduction of saffron in alpine areas could help to broaden and diversify the activities of mountain mult... Saffron, obtained from the flower stigmas of Crocus sativus L., is one of the most expensive food spices. The introduction of saffron in alpine areas could help to broaden and diversify the activities of mountain multifunctional farms, with a positive impact on economy and land management. According to ISO 3632(2010/2011), saffron can be classified into three categories of quality(I, II, III) depending on the concentration of the three main metabolites responsible for its characteristic colour, flavor and aroma: Crocin, Picrocrocin and Safranal. This study represents the first investigation of the quality of saffron produced in the Italian Alps evaluated with spectrophotometry, HPLC, solid-phase microextraction(SPME), and gas chromatographic analysis combined with mass spectrometry(GC/MS). The experiments used Crocus sativus stigmas produced in 2012-2013 in different areas of the Central Italian Alps were located at an altitude between 720 and 1200 m a.s.l.. Results obtained were compared to commercial saffron. The analyses confirmed that all samples can be classified in the first quality category according to the ISO classification. This high quality is also confirmed by HPLC analysis. Moreover, the SPME-GC/MS analysis identified some differences in the aromatic profile of saffron samples, in particular regarding safranal concentration. A preliminary assessment of the economic viability of high quality saffron production for local markets was also performed. Our study provides valid information regarding the quality and economic sustainability of saffron production in the alpine area confirming this crop as a good candidate for a new source of income for multifunctional farms in mountain areas. 展开更多
关键词 Crocus sativus L. Alps ISO 3632 UV– Vis spectrophotometry SPME-GC/MS HPLC
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Thermo-responsive graphene dispersions by liquid phase exfoliation of graphite aided by an alkylated Percec monodendron
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作者 Keyang Yin 《Science China Materials》 SCIE EI CSCD 2017年第4期343-351,共9页
Large-scale production of graphene and sub- sequent sample engineering is the key for fully-realizing the potential applications proposed to this intriguing two-dimensional nanomaterial. Herein, smart graphene dispers... Large-scale production of graphene and sub- sequent sample engineering is the key for fully-realizing the potential applications proposed to this intriguing two-dimensional nanomaterial. Herein, smart graphene dispersions with low defects and thermo-responsive properties can be obtained by liquid phase exfoliation of graphite using an alkylated Percec monodendron (3,4,5-trioctadecy- loxybenzaldehyde, 1) as the stabilizing reagent. By simply changing the temperature, the dispersed graphene and 1 can be detached, leading to the recovery of both components. Besides noncovalent wrapping, the stabilizing reagent 1 can be also covalently attached to graphene through [3+2] cycloaddition. The covalently functionalized graphene sheets show improved dispersibility in organic solvents compared to the pristine graphene, which opens the door for their applications in various polymer matrixes. The strategy demonstrated here provides a new methodology to get smart graphene dispersions with multiple functions. 展开更多
关键词 GRAPHENE THERMO-RESPONSIVE liquid phase exfoliation alkylated CYCLOADDITION
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