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Effects of fibrous fillers on friction and wear properties of polytetrafluoroethylene composites under dry or wet conditions 纤维填料对聚四氟乙烯复合材料干湿摩擦磨损性能的影响
China Particuology Pub Date : 2007-12-01 DOI: 10.1016/j.cpart.2007.08.003
Huaiyuan Wang, Xin Feng, Yijun Shi, Xiaohua Lu
{"title":"Effects of fibrous fillers on friction and wear properties of polytetrafluoroethylene composites under dry or wet conditions","authors":"Huaiyuan Wang,&nbsp;Xin Feng,&nbsp;Yijun Shi,&nbsp;Xiaohua Lu","doi":"10.1016/j.cpart.2007.08.003","DOIUrl":"https://doi.org/10.1016/j.cpart.2007.08.003","url":null,"abstract":"<div><p>The friction and wear behavior and mechanism as well as the mechanical properties of polytetrafluoroethylene (PTFE) composites filled with potassium titanate whiskers (PTW) and short carbon fibers (CF) under dry, wet and alkaline conditions were investigated. Experiments indicated that owing to appropriate cooling and boundary lubricating effects, the filled PTFE composites showed much lower frictional coefficient and better wear resistance under alkaline than dry and wet sliding conditions. The wear resistance of carbon-fiber-filled PTFE was much better than that of potassium titanate-whisker-filled PTFE composites in water. Results also showed that the transfer film on counterpart rings was significantly hindered by water and alkali. Hydrophilic-filler-reinforced PTFE composites yield higher wear rate when sliding under water.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 6","pages":"Pages 414-419"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.08.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91763212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Acknowledgement to referees 向裁判员致谢
China Particuology Pub Date : 2007-12-01 DOI: 10.1016/S1672-2515(07)00142-X
{"title":"Acknowledgement to referees","authors":"","doi":"10.1016/S1672-2515(07)00142-X","DOIUrl":"https://doi.org/10.1016/S1672-2515(07)00142-X","url":null,"abstract":"","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 6","pages":"Pages 430-431"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1672-2515(07)00142-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91590294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Large-scale distribution of elements in Chinese aerosol 中国气溶胶元素的大尺度分布
China Particuology Pub Date : 2007-12-01 DOI: 10.1016/j.cpart.2007.07.004
Jinghua Guo , Kenneth A. Rahn , Guoshun Zhuang , Shuifeng Wang
{"title":"Large-scale distribution of elements in Chinese aerosol","authors":"Jinghua Guo ,&nbsp;Kenneth A. Rahn ,&nbsp;Guoshun Zhuang ,&nbsp;Shuifeng Wang","doi":"10.1016/j.cpart.2007.07.004","DOIUrl":"10.1016/j.cpart.2007.07.004","url":null,"abstract":"<div><p>In spite of increasing attention on Chinese aerosol, there has never been a country-wide survey of its general characteristics. This paper presents elemental data for aerosol at 23 sites in and around China, mostly drawn from the literature, and shows some of the large-scale patterns. Al, Na, and Se are used to represent the crustal, marine, and pollution components, respectively. Most of the patterns are aligned in SW–NE. Al and Na are highest to the NW and the SE, respectively, and their ratio changes rapidly near the coast. Se has a broad maximum over Central China, and the Se/Al ratio (an indicator of pollution vs. crustal aerosol) increases progressively from the NW to the SE. A simple index for simulating pollution aerosol, which uses population density, annual precipitation, and mean wind speed, adequately reproduces the large-scale pattern of pollution aerosol and shows how crustal Al in the NW gradually gives way to flyash Al toward the SE.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 6","pages":"Pages 395-400"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.07.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82049597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Preparation of ultrafine chitosan particles by reverse microemulsion 反相微乳液法制备超细壳聚糖颗粒
China Particuology Pub Date : 2007-12-01 DOI: 10.1016/j.cpart.2007.08.002
Guogen Liu , Lei Shao , Fei Ge , Jianfeng Chen
{"title":"Preparation of ultrafine chitosan particles by reverse microemulsion","authors":"Guogen Liu ,&nbsp;Lei Shao ,&nbsp;Fei Ge ,&nbsp;Jianfeng Chen","doi":"10.1016/j.cpart.2007.08.002","DOIUrl":"10.1016/j.cpart.2007.08.002","url":null,"abstract":"<div><p>Ultrafine chitosan particles were prepared by reverse microemulsion consisting of water, Triton X-100, octanol and cyclohexane. Two methods of preparing ultrafine chitosan particles were adopted and compared using TEM and IR, and possible mechanisms for the formation of ultrafine chitosan particles were proposed. Experimental results show that the method which combined ionic gelation and cross-linking gave uniformly sized chitosan nanoparticles with an average diameter of 92<!--> <!-->nm, while the cross-linking without ionic gelation produced spindly chitosan particles with an average length of 943<!--> <!-->nm and width of 188<!--> <!-->nm.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 6","pages":"Pages 384-390"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.08.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85957004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Simulation of atmospheric aerosols in East Asia using modeling system RAMS-CMAQ: Model evaluation 利用RAMS-CMAQ模式系统模拟东亚地区大气气溶胶:模式评价
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/J.CPART.2007.07.002
Meigen Zhang, Z. Han, Lingyun Zhu
{"title":"Simulation of atmospheric aerosols in East Asia using modeling system RAMS-CMAQ: Model evaluation","authors":"Meigen Zhang, Z. Han, Lingyun Zhu","doi":"10.1016/J.CPART.2007.07.002","DOIUrl":"https://doi.org/10.1016/J.CPART.2007.07.002","url":null,"abstract":"","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"225 1","pages":"321-327"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80188514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Synthesis of Fe3O4 nanoparticles by wet milling iron powder in a planetary ball mill 行星球磨机湿磨铁粉合成纳米Fe3O4
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/j.cpart.2007.05.005
Ding Chen, Song Ni, Zhenhua Chen
{"title":"Synthesis of Fe3O4 nanoparticles by wet milling iron powder in a planetary ball mill","authors":"Ding Chen,&nbsp;Song Ni,&nbsp;Zhenhua Chen","doi":"10.1016/j.cpart.2007.05.005","DOIUrl":"10.1016/j.cpart.2007.05.005","url":null,"abstract":"<div><p>Fe<sub>3</sub>O<sub>4</sub> nanoparticles with sizes ranging from 30 to 80<!--> <!-->nm were synthesized by wet milling iron powders in a planetary ball mill. The phase composition and the morphologies of the as-synthesized products were measured by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Nanosized Fe<sub>3</sub>O<sub>4</sub> particles were prepared by wet milling metallic iron powder (−200 mesh, 99%) in a planetary ball mill equipped with stainless steel vials using iron balls under distilled water with a ball-to-powder mass ratio of 50:1 and at a rotation speed of 300<!--> <!-->rpm. The use of the iron balls in this method played a key role in Fe<sub>3</sub>O<sub>4</sub> formation. The present technique is simple and the process is easy to carry out.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 5","pages":"Pages 357-358"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.05.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72776992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 53
Clustering behavior of solid particles in two-dimensional liquid–solid fluidized-beds 二维液固流化床中固体颗粒的聚集行为
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/j.cpart.2007.07.001
Xiaodong An , Mingyan Liu , Yunguan Fu
{"title":"Clustering behavior of solid particles in two-dimensional liquid–solid fluidized-beds","authors":"Xiaodong An ,&nbsp;Mingyan Liu ,&nbsp;Yunguan Fu","doi":"10.1016/j.cpart.2007.07.001","DOIUrl":"https://doi.org/10.1016/j.cpart.2007.07.001","url":null,"abstract":"<div><p>In this paper, the clustering behavior of solid particles in a two-dimensional (2D) liquid–solid fluidized-bed was studied by using the charge coupled devices (CCD) imaging measuring and processing technique and was characterized by fractal analysis. CCD images show that the distribution of solid particles in the 2D liquid–solid fluidised-bed is not uniform and self-organization behavior of solid particles was observed under the present experimental conditions. The solid particles move up in the 2D fluidized-bed in groups or clusters whose configurations are often in the form of horizontal strands. The box fractal dimension of the cluster images in the 2D liquid–solid fluidized-bed increases with the rising of solid holdup and reduces with the increment of solid particle diameter and superficial liquid velocity. At given solid holdup and solid particle size, the lighter particles show smaller fractal dimensions.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 5","pages":"Pages 305-311"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.07.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72247341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Drying of suspensions and solutions on inert particle surface in mechanically spouted bed dryer 机械喷淋床干燥机中悬浮液和溶液在惰性颗粒表面的干燥
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/j.cpart.2007.06.003
Elisabeth Pallai-Varsányi , Judit Tóth , János Gyenis
{"title":"Drying of suspensions and solutions on inert particle surface in mechanically spouted bed dryer","authors":"Elisabeth Pallai-Varsányi ,&nbsp;Judit Tóth ,&nbsp;János Gyenis","doi":"10.1016/j.cpart.2007.06.003","DOIUrl":"10.1016/j.cpart.2007.06.003","url":null,"abstract":"<div><p>To eliminate some disadvantages of the conventional spouted bed dryers the mechanically spouted bed (MSB) system was developed. This dryer type is convenient to use inert particles providing an increased surface area for drying of materials of high-moisture content and heat sensitive materials. On three different drying tasks are demonstrated the experimental optimization of process parameters to obtain products of demanded quality. The main object was at drying of AlO(OH) suspension to preserve the particle size under 2.5<!--> <!-->μm and to obtain product with a moisture content of about 0.05<!--> <!-->kg/kg (d.b.). For this reason a very thin particle coating and intensive abrasion had to be assured. At drying of tomato concentrates the thermoplasticity makes the process very difficult. To jump over the deliquescent and sticky state developed at the critical temperature–moisture content values a very short drying time (8–10<!--> <!-->s) must be provided. The third task was to form powder-like product from bovine serum albumin (BSA) solution having very low solid content (2–4%). The selected process parameters given in this paper resulted in a mean particle size of less than 20<!--> <!-->μm while the soluble preserved protein content was higher than 90%.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 5","pages":"Pages 337-344"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.06.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84316835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Counting and measuring particles sized from soot to pollen 计算和测量从煤烟到花粉的颗粒大小
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/j.cpart.2007.05.006
Martin Schmidt, Sven Schütz, Leander Mölter
{"title":"Counting and measuring particles sized from soot to pollen","authors":"Martin Schmidt,&nbsp;Sven Schütz,&nbsp;Leander Mölter","doi":"10.1016/j.cpart.2007.05.006","DOIUrl":"10.1016/j.cpart.2007.05.006","url":null,"abstract":"<div><p>For number concentration measurements of superfine particles a condensation nucleus counter (CNC) is frequently used. The combination of a new CNC module with a white light aerosol spectrometer and a passive collector makes possible accurate time-resolved determination of particle number within the overall size range of 10<!--> <!-->nm to 40<!--> <!-->μm and at concentrations up to 10<sup>5</sup> <!-->particles/cm<sup>3</sup>. With the aerosol spectrometer a high time-resolved particle size determination is also possible in the size range of 0.3–40<!--> <!-->μm up to the same high number concentrations of 10<sup>5</sup> <!-->particles/cm<sup>3</sup>.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 5","pages":"Pages 359-361"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.05.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76750723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of atmospheric aerosols in East Asia using modeling system RAMS-CMAQ: Model evaluation 使用建模系统RAMS-CAQ模拟东亚大气气溶胶：模型评估
China Particuology Pub Date : 2007-10-01 DOI: 10.1016/j.cpart.2007.07.002
Meigen Zhang , Zhiwei Han , Lingyun Zhu
{"title":"Simulation of atmospheric aerosols in East Asia using modeling system RAMS-CMAQ: Model evaluation","authors":"Meigen Zhang ,&nbsp;Zhiwei Han ,&nbsp;Lingyun Zhu","doi":"10.1016/j.cpart.2007.07.002","DOIUrl":"https://doi.org/10.1016/j.cpart.2007.07.002","url":null,"abstract":"<div><p>The modeling system RAMS-CMAQ is applied in this paper to East Asia to simulate the temporo-spatial concentration distributions of atmospheric aerosols. For evaluating its performances, modeled concentrations of aerosols such as sulfate, nitrate, ammonium, black carbon and organic carbon were compared with observations obtained in East Asia on board of two aircrafts in the springtime of 2001. The comparison showed generally good agreement, and, in particular, that the modeling system captured most of the important observed features, including vertical gradients of the aerosols of the Asian outflow over the western Pacific. The evaluation results provide us with much confidence for further use of the modeling system to investigate the transport and transformation processes of atmospheric aerosols over East Asia and to assess their impacts on the Earth's radiation budget.</p></div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"5 5","pages":"Pages 321-327"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cpart.2007.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72247339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 28
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