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超临界流体干燥

超临界流体干燥的相关文献在1995年到2022年内共计130篇,主要集中在化学工业、化学、一般工业技术 等领域,其中期刊论文100篇、会议论文15篇、专利文献193527篇;相关期刊68种,包括西安工业大学学报、材料导报、功能材料等; 相关会议15种,包括第十二届全国干燥会议、铜牛杯第九届功能性纺织品及纳米技术研讨会、第十一届全国耐火材料青年学术报告会等;超临界流体干燥的相关文献由237位作者贡献,包括汪厚植、余高奇、李青等。

超临界流体干燥—发文量

期刊论文>

论文:100 占比:0.05%

会议论文>

论文:15 占比:0.01%

专利文献>

论文:193527 占比:99.94%

总计:193642篇

超临界流体干燥—发文趋势图

超临界流体干燥

-研究学者

  • 汪厚植
  • 余高奇
  • 李青
  • 梁丽萍
  • 张敬畅
  • 曹维良
  • 高荫本
  • 党淑娥
  • 廖传华
  • 曾翎
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 刘秀兰; 马爱洁; 霍建国
    • 摘要: ZAO(Aluminum-doped zinc oxide) shows excellent properties which relates nano-materials and oxide semiconductor .But the nano-powder forms aggregation easily with the decrease of powder size .To solve this problem ,“coprecipitation/supercritical fluid drying(SCFD)”is investigated .Adding in different surfactant during the process of coprecipitation supercritical fluid drying ,ZAO nanopowders are synthesized .XRD is employed for the analysis of phase .T EM is used to characterize the morphology , grain size and agglomeration state of ZAO powders .The effect of species and dosage of surfactant ,dosage of transition liquid on the properties of nano-powder was reviewed .Results show :When the molar ratio of surfactant PEG-400 and Zn2+ ion is 1∶16 ,ZAO powders are obtained with size smaller than 10 nm . Particle distribution shows that there no significant aggregation in ZAO powder .%ZAO(ZnO/Al2 O3复合氧化物)结合了纳米材料和半导体氧化物的优越性能,但随着粉体粒径的减小,粉体极易发生团聚.为解决纳米粉体的团聚现象,采用“共沉淀桘超临界流体干燥”结合法,加入几种不同的表面活性剂制备了ZAO超细纳米粉.实验通过X射线衍射对ZAO粉末物相进行分析.TEM 观察粒子的形貌、粒径大小及其团聚状态,分析了几种表面活性剂的种类及用量对粉末特性的影响.该方法有效地解决了粉体的团聚现象.研究结果表明:采用“共沉淀桘超临界流体干燥”技术,加入表面活性剂PEG桘400,且其与Zn2+离子的物质的量比为1∶16时,制备的ZAO粒子的平均粒度小于10 nm ,粉体粒径均匀,分散性好,团聚现象不明显.
    • 刘奋照; 王中慧; 薛玫; 霍宇平
    • 摘要: 采用尿素均相沉淀法结合CO2超临界干燥制备了1%Ce:YAG粉体,用XRD、BET、SEM和荧光分光光度计等测试手段对前驱体及煅烧样品进行表征。表明前驱体由非晶态的氢氧化物和碳酸盐组成,1100°C结晶产物为纯YAG相,未产生YAM、YAP等中间相,产物呈球形,分散均匀。与直接干燥样品相比,CO2超临界干燥样品的激发光谱和发射光谱强度均增加,并产生5 nm的红移。%Cerium-doped yttrium aluminum( Ce:YAG)precursor precipitates with 1% cerium contents were synthesized by homogeneous precipitation combined with supercritical carbon dioxide fluid drying. The calcined samples were characterized by XRD,BET,SEM and fluorescence spectrophotometer. The results showed that the obtained precursor consists of amorphous hydroxides and carbonates,and converted to pure YAG at 1 100 °C without the formation of interphase such as YAM and YAP. The resultant powders calcined at 1100 °C presented sphere with good dispersity. Compared with the conventional drying samples,the fluorescence spectra showed that the emission spectra and excitation spectra intensity of l% Ce:YAG powders obtained by supercritical carbon dioxide fluid drying increased,and the 5nm bathochromic-shift was detected.
    • 陈颖; 邢宸; 姬生伦; 梁宏宝
    • 摘要: The HPA/Bi2WO6 was prepared with Na2WO4·2H2O, Bi(NO3)3·5H2O and different surfactant templates. The prepared sample was dried by the supercritical fluid drying (SCFD) method. It was characterized with XRD, FT-IR and SEM techniques and N2 sorption experiment. Its photocatalytic properties were evaluated with denitrification of nitrogen-containing simulated oil as model reaction. It was shown that the sodium dodecyl sulfate ( SDS ) should be chosen as template. With this template, a highly dispersed, crystalline and active photocatalyst was obtained. This catalyst had a larger specific surface area. The SCFD method effectively decreased pore collapse and particles agglomeration degree, consequently increasing the specific surface area and improving the catalytic performance. Immobilization of H3 PW12 O40 on Bi2 WO6 increased the surface acid sites, and hence the photocatalytic activity. When the H3 PW12 O40 loading was 10%, about 92. 08% of nitrogen in simulated oil were removed by shining for 3 h with a xenon lamp at the mcatalysts/msimulated oil ratio of 1:100.%以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控,将调控形貌后的催化剂固载不同种类杂多酸(HPA),再进行超临界流体干燥制得HPA/Bi2WO6光催化剂。并采用X射线衍射( XRD)、紫外-可见漫反射( UV-vis)、扫描电镜( SEM)、比表面积测定仪( BET)对所制备的催化剂进行表征,通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明,十二烷基硫酸钠( SDS)能起到更好的模板导向作用,从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥,可有效地避免孔塌陷、团聚等现象,进一步增大了催化剂的比表面积,其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点,从而显著提高了催化剂的催化活性,磷钨酸固载量为10%、剂油比为1:100时、氙灯光照3 h脱氮率可达92.08%。
    • 陈颖; 邢宸; 姬生伦; 梁宏宝
    • 摘要: 以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控,将调控形貌后的催化剂固载不同种类杂多酸(HPA),再进行超临界流体干燥制得HPA/Bi2WO6光催化剂。并采用X射线衍射(XRD)、紫外-可见漫反射(UV-vis)、扫描电镜(SEM)、比表面积测定仪(BET)对所制备的催化剂进行表征,通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明,十二烷基硫酸钠(SDS)能起到更好的模板导向作用,从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥,可有效地避免孔塌陷、团聚等现象,进一步增大了催化剂的比表面积,其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点,从而显著提高了催化剂的催化活性,磷钨酸固载量为10%、剂油比为1∶100时、氙灯光照3 h脱氮率可达92.08%。
    • 陈慧敏; 安琴友
    • 摘要: Highly-dispersed ZrO2 nanoparticles (NPs) were successfully synthesized via sol-gel and supercritical fluid drying (SCFD) method with zirconium oxyehloride as the source. The as-synthesized ZrO2 was characterized by X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetary (CV). The results indicate that the nearly spherical ZrO2 three-dimensional network NPs possess diameters of about 10nm, and the pure ZrO2 after SCFD treat ment maintains uniform crystal structure while the 3Y-ZrO2 have many crystal defects. The electrochemical performance of ZrO2 NPs showed that the pure ZrO2 NPs after SCFD treatment have very small electrochemical impedance and well-performance of cyclical stability, which provide a new orient of lithium batteries materials.%以ZrOCl2·8H2O为原料,结合溶胶凝胶法和超临界流体干燥技术制备了高分散纳米ZrO,粉体颗粒,通过X射线衍射仪(XRD)、高分辨透射电镜(HRTEM)、电化学阻抗谱(EIS)和循环伏安(CV)等技术手段研究探讨了ZrO2粉体颗粒的晶体缺陷、粉末晶粒尺寸大小及其电化学性能。成功地制备了粒径为10nm以下的近球形ZnO2三维网络纳米颗粒,实验结果表明。超临界流体干燥处理后的纯ZrO2晶粒基本保持完整,而3Y—ZrO2晶体缺陷较为明显。并首次对纯ZrO2的锂离子电化学性能作了一系列的初步研究,发现超临界流体处理后的ZrO2粉体具有很小的电化学阻抗;即使其作为锂离子电极材料容量可逆容量较低,但其多次循环后稳定性较好,这为锂离子电池材料的开发提供了新的思路。
    • 陈阳; 黄艳; 余高奇; 汪厚植; 赵慧忠; 张侃
    • 摘要: Using cerium carbonate, lanthanum oxide and manganese nitrate as raw materials, Ce-La-Mn aerogel was prepared by sol-gel method combined with supercritical drying technology, and ultrafine particles of Ce-La-Mn mixed oxides were got after heat treatment at 850°C. The prepared materials were characterized by TG-DTA, XRD, FT-IR and TEM. The catalytic properties of ultrafine Ce-La-Mn mixed oxides were tested by reaction "2CO+2NO= 2CO2 +N2". The key aim was to examine the effect of supercritical fluid drying technology and Ce-doping on ultrafine Ce-La-Mn mixed oxides' crystal structure, morphology and catalytic activity. The results show; at 260°C, Ce-La-Mn mixed oxides was brown loose flocculent powder with good dispersibility. The particles were spherical about 10nm in size. The main crystal components were CeO2, MnO, La5O7NO3 and La(OH)2NO3, After thermal treating at 850°C, Ce-La-Mn mixed oxides were made up of lots of quasi-global grains smaller than 20nm;the main crystal components of the Ce-La-Mn mixed oxides were LaMnO3+λ La2 O3 and CeO2 heat treatment could enhance the crystallinity of the materials. Ce-doping increased the oxygen vacancies of LaMnOs+λ lattice, improved the condition of redox catalysis, effected the migration of the perovskite lattice oxygen and advanced the catalysis activity of Ce-La-Mn mixed oxides.%以碳酸铈、氧化镧和硝酸锰为主要原料,采用“溶胶-凝胶”法结合“超临界流体干燥”技术获取Ce-La-Mn气凝胶,在850°C热处理制备Ce-La-Mn混合氧化物,并采用TG-DTA、XRD、FT-IR和TEM进行表征,用“2CO+2 NO=2CO2+ N2”特征反应测试超细粒子的催化活性,考察超临界流体干燥技术与铈掺杂对超细Ce-La-Mn 混合氧化物的结构、形貌和催化活性的影响.结果显示:经260°C超临界流体干燥得到的Ce-La-Mn气凝胶为分散性好的棕色絮状粉末,由大量直径小于10nm的球型颗粒组成,晶相为CeO2、MnO、La5O7NO3和La(OH)2NO3;经850°C热处理得到的Ce-La-Mn混合氧化物的粒径约为20nm,晶相为LaMnO3+λ、La2O3和CeO2;铈掺杂增加了LaMnO3+λ晶格中氧空缺数量,改善了催化的气氛条件,提高了Ce-La-Mn混合氧化物的催化活性.
    • 安琴友; 陈慧敏; 石赞
    • 摘要: The preparation of Nano Zirconia powder with the supercritical fluid drying (SCFD) method in different heat treatment process and the sample analysis of TEM and XRD results show that the heat temperature and time on properties of Nano-ZrO2 powders effect is significant. With the increase of heat treatment temperature and time, powder transition from t phase to m phase, grain size is gradually increasing, but heat treatment temperature greatly has the more effect on the ZrO2phase composition and grain size than time.%用超临界流体干燥法制备了纳米ZrO2粉体,并用不同热处理工艺进行处理,之后对样品进行TEM和XRD分析.结果表明,煅烧温度和煅烧时间对纳米ZrO2粉体性能的影响是显著的.随着煅烧温度的提高和时间的延长,粉体由t相转变为m相,晶粒尺寸逐渐增大,但是煅烧温度对ZrO2相组成和晶粒尺寸的影响比时间的影响更大.
    • 龚圣; 周新华; 尹国强; 宋光泉; 李翠金; 杨卓如
    • 摘要: After antimony doped tin oxide (ATO) precursors were prepared by the sol-gel method, oven drying, microwave drying, vacuuming drying and supercritical fluid drying (SCFD) were used to treat the alcogels of ATO precursors. Weakly agglomerated nano-sized ATO particles with tetragonal phase structure were obtained after dry precursors were annealed at 600°C under atmosphere. The nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM) and Malvern Zen1600 Zeta sizer. The results showed that ATO particles with tetragonal phase structure were all well crystallized from four drying processes. However,only the ATO powder prepared by SCFD consisted of primary particles weakly attached to each other, and the average size was around 25 nm. The mechanism was that the particles of precursors could keep loose morphology after treatment by SCFD, which was the key to preparing weekly agglomerated nano-sized ATO particles. In conclusion, it was an effective way to avoid the nano-sized ATO agglomeration by SCFD process in the sol-gel method.%采用溶胶-凝胶法制备纳米锑掺杂氧化锡(antimony doped tin oxide,ATO)前驱体,然后通过烘干、微波、真空以及超临界流体干燥(supercritical fluid drying,SCFD)等方式干燥醇凝胶,并在600°C下进行热处理,考察干燥方式对最终产物纳米ATO团聚情况的影响.利用XRD、SEM、TEM、马尔文粒度仪等对前驱体以及纳米ATO的结构、形貌等进行表征,结果表明:采用4种方式对前驱体醇凝胶进行干燥,以SCFD处理得到的前驱体结构最为疏松,ATO颗粒呈不规则球形、粒度较为均匀,平均粒径约25nm.通过对常规干燥过程导致团聚以及SCFD消除前驱体粒子团聚的机理分析,揭示了采用超临界流体干燥醇凝胶能够使前驱体粒子保持松散的结构,并最终获得粒径小、分散性好的纳米ATO粉体,是消除纳米ATO粉体的团聚的有效途径.
    • 付霞; 余高奇; 陈阳; 张侃; 汪厚植; 张光德
    • 摘要: 以La2O3和Co(NO3)·26H2O为主要原料,用"超临界流体干燥"技术结合"溶胶-凝胶"法制各超细镧-钴混合氧化物.采用 TG-DTA、XRD、FT-IR、TEM等手段进行表征;考察了超临界流体干燥技术对混合氧化物晶态和形貌的影响;并通过"2NO+2CO=N2+2CO2"的反应测试混合氧化物的催化活性.结果显示,260°C时,经超临界流体干燥得到的镧-钴混合氧化物为疏松、絮状且有较好分散性的棕色粉末,由大量直径小于10nm的球形小颗粒组成;850°C热处理后,镧-钴混合氧化物主要由晶态的LaCoO3、La2O3和非晶态的Co2O3组成;球形颗粒出现一定程度的团聚.粒径介于15~35nm;稀土镧影响了镧-钴混合氧化物中钴氧化物的晶化.
    • 陈阳; 余高奇; 付霞; 张侃; 汪厚植; 张光德
    • 摘要: 以La2O3和Co(N03)2·6H20为主要原料,用溶胶一凝胶法结合超临界流体干燥技术制备了超细钙钛矿型LaCoO3。采用TGDTA、XRD、FT-IR和TEM检测手段进行表征;以15w的紫外灯为光源,用甲基橙溶液的光催化降解测试超细LaC003的催化活性。结果显示,250°C时经超临界流体干燥,可获取直径小于10nm的无定形La—CoO3球形颗粒;850°C热处理后,可制得粒径介于15-35nm之间的钙钛矿型LaCoO3类球形颗粒;900°C时La—Co超细粒子中晶相成分为LaCoO3和La2O3,无定形成分为Co203,稀土镧影响了钴氧化物的晶化;在超细LaCoO3催化作用下,10mg/L甲基橙溶液500mL完全降解约需4h。
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