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Characterization of Li-rich layered oxides by using transmission electron microscope
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作者 Hu Zhao Bao Qiu +3 位作者 Haocheng Guo Kai Jia Zhaoping Liu Yonggao Xia 《Green Energy & Environment》 SCIE 2017年第3期174-185,共12页
Lithium-rich layered oxides(LrLOs) deliver extremely high specific capacities and are considered to be promising candidates for electric vehicle and smart grid applications. However, the application of LrLOs needs fur... Lithium-rich layered oxides(LrLOs) deliver extremely high specific capacities and are considered to be promising candidates for electric vehicle and smart grid applications. However, the application of LrLOs needs further understanding of the structural complexity and dynamic evolution of monoclinic and rhombohedral phases, in order to overcome the issues including voltage decay, poor rate capability, initial irreversible capacity loss and etc. The development of aberration correction for the transmission electron microscope and concurrent progress in electron spectroscopy, have fueled rapid progress in the understanding of the mechanism of such issues. New techniques based on the transmission electron microscope are first surveyed, and the applications of these techniques for the study of the structure, migration of transition metal, and the activation of oxygen of LrLOs are then explored in detail, with a particular focus on the mechanism of voltage decay. 展开更多
关键词 Lithium-ion battery transmission electron microscope Lithium-rich layered oxide Cathode material
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OBSERVATION OF THE EFFECT OF S-(-)USNIC ACID SODIUM ON TRICHOMONAS VAGINALIS BY TRANSMISSION ELECTRON MICROSCOPE 被引量:1
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作者 吴杰 张敏如 +2 位作者 丁东宁 谭廷华 闫宝琦 《Journal of Pharmaceutical Analysis》 CAS 1994年第1期56-59,共4页
This paper reports the ultrastructural changes of trichomonas vaginaiis (T. vag. ) under the action of s-(-)usnic acid sodium in vitro. These changes can be shown by the following results:At first, the degranulation o... This paper reports the ultrastructural changes of trichomonas vaginaiis (T. vag. ) under the action of s-(-)usnic acid sodium in vitro. These changes can be shown by the following results:At first, the degranulation of the rough endoplasmic reticulum (RER) took place, the polyribosomes disaggregated. And then, the Golgi complex and the endoplasmic reticulum dilated. The cytoplasmic matrix presented and inhomogeneous apperance. Finally, the biomembrane loosed and fractured.The cell nuclei presented the karyorrhexis. 展开更多
关键词 s-(-)usnic acid sodium trichomonas vaginalis (T. vag. ) ULTRASTRUCTURE transmission electron microscope (TEM)
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Ultrastructural view of colon anastomosis under propolis effect by transmission electron microscopy 被引量:2
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作者 Sibel Serin Kilicoglu Bulent Kilicoglu Esra Erdemli 《World Journal of Gastroenterology》 SCIE CAS CSCD 2008年第30期4763-4770,共8页
AIM: To evaluate the effect of propolis administration on the healing of colon anastomosis with light and transmission electron microscopes. METHODS: Forty-eight Wistar-AIbino female rats were divided into two group... AIM: To evaluate the effect of propolis administration on the healing of colon anastomosis with light and transmission electron microscopes. METHODS: Forty-eight Wistar-AIbino female rats were divided into two groups and had colon resection and anastomosis. In group Ⅰ, rats were fed with standard rat chow pre- and postoperatively. The rats in group Ⅱ were fed with standard rat chow and began receiving oral supplementation of propolis 100 mg/kg per day beginning 7 d before the operation and continued until they were sacrificed. Rats were sacrificed 1, 3, 7 and 14 d after operation, and anastomotic bursting pressures measured. After the resection of anastomotic segments, histopathological examination was performed with light and transmission electron microscopes by two blinded histologists and photographed. RESULTS: The colonic bursting pressures of the propolis group were statistically significantly better than the control group. UItrastructural histopathological analysis of the colon anastomosis revealed that propotis accelerated the phases of the healing process and stimulated mature granulation tissue formation and collagen synthesis of fibroblasts. CONCLUSION: Bursting pressure measurements and ultra structural histopathological evaluation showed that administration of propolis accelerated the healing of colon anastomosis following surgical excision. 展开更多
关键词 PROPOLIS Wound healing Colon anastomosis HISTOPATHOLOGY transmission electron microscope
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Electron Micrographic Representations of Mechanisms of Action of Murine Norovirus on ATCC TIB-71 Cells and Level of Gene Expression 被引量:1
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作者 Uchenna B. Iloghalu Sara E. Miller +3 位作者 Akamu J. Ewunkem Janak R. Khatiwada Shurrita S. Davis Leonard L. Williams 《Advances in Microbiology》 CAS 2023年第1期32-47,共16页
Human noroviruses (HuNoV) are the number one cause of viral gastroenteritis worldwide resulting in a significant cause of morbidity and mortality in all age groups. However, despite the medical relevance of HuNoV, eff... Human noroviruses (HuNoV) are the number one cause of viral gastroenteritis worldwide resulting in a significant cause of morbidity and mortality in all age groups. However, despite the medical relevance of HuNoV, effective treatment against norovirus infection is yet to be developed. In this study, we investigated the anti-Noroviral activity of Hibiscus sabdariffa (HS) calyces and Zanthoxylum armatum (ZA) seeds using murine norovirus, a surrogate of human norovirus. The antiviral mechanisms of action were also examined using a gene expression studies and transmission electron microscopy. Our results showed that virus-infected cells were left potentially void of all the cell machineries whereas uninfected cells represent healthy normal and dividing cells. The infected treated cells with extracts showed restoration of the dense cytoplasm, cytoplasmic membrane, and the nucleus. These cells were also associated with the expression of ORF genes. This study demonstrates the antiviral properties of Hibiscus sabdariffa (HS) calyces and Zanthoxylum armatum (ZA) and thus indicates their potential as natural remedies to treat noroviruses. 展开更多
关键词 NOROVIRUS Plant Extracts transmission electron microscope Prevention/Control
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Bacteriological and electron microscopic examination of primary intrahepatic stones 被引量:17
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作者 Shuo-Dong Wu, Hong Yu and Ji-Mei Sun Department of General Surgery Department of Microbiology Center Second Affiliated Hos- pital China Medical University, Shenyang 110004, China 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS 2006年第2期228-231,共4页
BACKGROUND: Primary intrahepatic cholelithiasis is usually combined with biliary tract infection. This research was undertaken to investigate the relationship between intrahepatic stones and biliary tract infection. M... BACKGROUND: Primary intrahepatic cholelithiasis is usually combined with biliary tract infection. This research was undertaken to investigate the relationship between intrahepatic stones and biliary tract infection. METHODS: Thirty-five bile samples and 30 stones specimens were cultured for bacteria and 12 stones specimens were examined with a scan electron microscope (SEM) or a transmission electron microscope (TEM). RESULT: 94.2% bile samples and 96.7% stones specimens were positive in bacteria culture. Bacteria were found in stones under SEM and TEM. CONCLUSION: Bacteria in stones are associated with the infection of the biliary tract. 展开更多
关键词 CHOLELITHIASIS BACTERIA scan electron microscope transmission electron microscope BIOFILM
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Nanoelectronic devices resonant tunnelling diodes grown on InP substrates by molecular beam epitaxy with peak to valley current ratio of 17 at room temperature 被引量:1
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作者 张杨 曾一平 +4 位作者 马龙 王宝强 朱占平 王良臣 杨富华 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第6期1335-1338,共4页
This paper reports that InAs/In0.53Ga0.47As/AlAs resonant tunnelling diodes have been grown on InP substrates by molecular beam epitaxy. Peak to valley current ratio of these devices is 17 at 300K. A peak current dens... This paper reports that InAs/In0.53Ga0.47As/AlAs resonant tunnelling diodes have been grown on InP substrates by molecular beam epitaxy. Peak to valley current ratio of these devices is 17 at 300K. A peak current density of 3kA/cm^2 has been obtained for diodes with AlAs barriers of ten monolayers, and an Ino.53Ga0.47As well of eight monolayers with four monolayers of InAs insert layer. The effects of growth interruption for smoothing potential barrier interfaces have been investigated by high resolution transmission electron microscope. 展开更多
关键词 resonant tunnelling diode InP substrate molecular beam epitaxy high resolution transmission electron microscope
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Ultrafast electron microscopy in material science
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作者 Huaixin Yang Shuaishuai Sun +5 位作者 Ming Zhang Zhongwen Li Zian Li Peng Xu Huanfang Tian Jianqi Li 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期32-43,共12页
Recent advances in the ultrafast transmission electron microscope (UTEM), with combined spatial and temporal resolutions, have made it possible to directly visualize the atomic, electronic, and magnetic structural d... Recent advances in the ultrafast transmission electron microscope (UTEM), with combined spatial and temporal resolutions, have made it possible to directly visualize the atomic, electronic, and magnetic structural dynamics of materials. In this review, we highlight the recent progress of UTEM techniques and their applications to a variety of material systems. It is emphasized that numerous significant ultrafast dynamic issues in material science can be solved by the integration of the pump-probe approach with the well-developed conventional transmission electron microscopy (TEM) techniques. For instance, UTEM diffraction experiments can be performed to investigate photoinduced atomic-scale dynamics, including the chemical reactions, non-equilibrium phase transition/melting, and lattice phonon coupling. UTEM imaging methods are invaluable for studying, in real space, the elementary processes of structural and morphological changes, as well as magnetic-domain evolution in the Lorentz TEM mode, at a high magnification. UTEM electron energy-loss spectroscopic techniques allow the examination of the ultrafast valence states and electronic structure dynamics, while photoinduced near-field electron microscopy extends the capability of the UTEM to the regime of electromagnetic-field imaging with a high real space resolution. 展开更多
关键词 ultrafast transmission electron microscope (UTEM) structural dynamics electron diffraction ul-trafast imaging
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Manufacturing of SEM and TEM Samples for Oocyte
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作者 武彩红 张斌 +2 位作者 郑筱峰 芮荣 戴建军 《Agricultural Science & Technology》 CAS 2009年第5期110-112,188,共4页
[ Objective] The research aimed to explore the manufacturing methods of scanning electron microscope (SEM) and transmission electron microscopy (TEM) for oocyte and provide technical support for related research. ... [ Objective] The research aimed to explore the manufacturing methods of scanning electron microscope (SEM) and transmission electron microscopy (TEM) for oocyte and provide technical support for related research. [ Method] Based on GV-and MII-stage oocytes, samples of SEM and TEM were prepared respectively, then ultrastructure changes were observed. [ Result] The results showed that the method needed few samples, keep intact cell morphology and can see clear ultrastructure. [Conclusion] The method is suitable for ultrastructural observation of oocyte. 展开更多
关键词 OOCYTE Scanning electron microscope (SEM) transmission electron microscope (TEM) ULTRASTRUCTURE
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MECHANISM OF MICROBAND FORMATION IN COLD ROLLED INTERSTITIAL-FREE STEEL
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作者 沈凯 DUGGAN B J 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2005年第4期344-350,共7页
The mechanism of the shear band formation in the high cold rolled BCC metal is analyzed. Based on the plastic deformation theory, the shear distribution in the deformed grain is calculated by using the Taylor constrai... The mechanism of the shear band formation in the high cold rolled BCC metal is analyzed. Based on the plastic deformation theory, the shear distribution in the deformed grain is calculated by using the Taylor constraint model and the Bishop & Hill maximum work principle. Results show that when the rolling direction (RD) is parallel to a certain direction of a grain, the large localized shear occurs on one slip plane, thus generating microbands in the grain because of the high localized shear strain. The angle between the RD and the shear band is about 30°. The plate-like structure of the microband is formed because of the dislocation double cross slip. The transmission electron microscope (TEM) observation of the microband in the cold rolled BCC metal confirms the formation mechanism of the microband. 展开更多
关键词 microband plastic deformation formation mechanism transmission electron microscope
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Biodegradable chitin conduit tubulation combined with bone marrow mesenchymal stem cell transplantation for treatment of spinal cord injury by reducing glial scar and cavity formation 被引量:7
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作者 Feng Xue Er-jun Wu +4 位作者 Pei-xun Zhang Li-ya A Yu-hui Kou Xiao-feng Yin Na Han 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第1期104-111,共8页
We examined the restorative effect of modified biodegradable chitin conduits in combination with bone marrow mesenchymal stem cell transplantation after right spinal cord hemisection injury. Immunohistochemical staini... We examined the restorative effect of modified biodegradable chitin conduits in combination with bone marrow mesenchymal stem cell transplantation after right spinal cord hemisection injury. Immunohistochemical staining revealed that biological conduit sleeve bridging reduced glial scar formation and spinal muscular atrophy after spinal cord hemisection. Bone marrow mesenchymal stem cells survived and proliferated after transplantation in vivo, and differentiated into cells double-positive for S100 (Schwann cell marker) and glial fibrillary acidic protein (glial cell marker) at 8 weeks. Retrograde tracing showed that more nerve fibers had grown through the injured spinal cord at 14 weeks after combination therapy than either treatment alone. Our findings indicate that a biological conduit combined with bone marrow mesenchymal stem cell transplantation effectively prevented scar formation and provided a favorable local microenvi- ronment for the proliferation, migration and differentiation of bone marrow mesenchymal stem cells in the spinal cord, thus promoting restoration following spinal cord hemisection injury. 展开更多
关键词 nerve regeneration spinal cord injury spinal cord hemisection biological conduit bonemarrow mesenchymal stem cells stem cells transmission electron microscope cell transplantation neurons nerve fibers NSFC grants neural regeneration
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Direct View of Cr Atoms Doped in Anatase TiO2(001) Thin Film
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作者 唐浩奇 林岳 +2 位作者 程正旺 崔雪峰 王兵 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2018年第1期71-76,I0001,I0002,共8页
Imaging the doping elements is doped TiO2 thin film. But it is critical for understanding the photocatalytic activity of still a challenge to characterize the interactions between the dopants and the TiO2 lattice at t... Imaging the doping elements is doped TiO2 thin film. But it is critical for understanding the photocatalytic activity of still a challenge to characterize the interactions between the dopants and the TiO2 lattice at the atomic level. Here, we use high angle annular dark- field/annular bright-field scanning transmission electron microscope (HAADF/ABF-STEM) combined with electron energy loss spectroscopy (EELS) to directly image the individual Cr atoms doped in anatase TiO2(001) thin film from [100] direction. The Cr dopants, which are clearly imaged through the atomic-resolution EELS mappings while can not be seen by HADDF/ABF-STEM, occupy both the substitutional sites of Ti atoms and the interstitial sites of TiO2 matrix. Most of them preferentially locate at the substitutional sites of Ti atoms. These results provide the direct evidence for the doping structure of Cr-doped A- TiO2 thin film at the atomic level and also prove the EELS mapping is an excellent technique for characterizing the doped materials. 展开更多
关键词 Anatase Ti02 Cr dopants Scanning transmission electron microscope Elec-tron energy loss spectroscopy Pulsed laser deposition
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Localization of AKAP4 and tubulin proteins in sperm with reduced motility 被引量:7
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作者 Elena Moretti Giacomo Scapigliati Nicola Antonio Pascarelli Baccio Baccetti Giulia Collodel 《Asian Journal of Andrology》 SCIE CAS CSCD 2007年第5期641-649,共9页
Aim: To perform screening, related to A-kinase anchoring proteins 4 (AKAP4) and tubulin proteins, in spermatozoa with absent or severely reduced motility in order to detect the status of the fibrous sheath and the ... Aim: To perform screening, related to A-kinase anchoring proteins 4 (AKAP4) and tubulin proteins, in spermatozoa with absent or severely reduced motility in order to detect the status of the fibrous sheath and the axonemal structure. Methods: An immunocytochemical study of tubulin, used as a positive control, and AKAP4 was carded out to detect the presence and the distribution of these proteins in different sperm samples. The morphological characteristics of sperm were studied by transmission electron microscope (TEM) and the results were elaborated using a formula reported in previous studies. PCR was carried out on DNA extracted from peripheral blood lymphocytes to analyse partial sequences of the Akap4 and Akap3 genes. Results: Immunolabelling of tubulin and AKAP4 showed different patterns, which led us to divide the patients into groups. In group I, the absence of AKAP4 and tubulin was revealed, although these patients did not show alterations in the Akap4/Akap3 binding site. TEM evaluation highlighted that a high presence of necrosis was associated with total sperm immotility. In group Ⅱ, a regular AKAP4 and tubulin signal was present, although motility was reduced and TEM analysis revealed the presence of immaturity. In group Ⅲ, in which a weak AKAP4 label associated with normal tubulin staining and reduced motility was observed, a severe disorganization of the fibrous sheath was highlighted by TEM. Conclusion: While the role of AKAP4 in sperm motility is unclear, absent or weak AKAP4-1abelling seems to be associated with absent or weak sperm motility. 展开更多
关键词 AKAP4 IMMUNOCYTOCHEMISTRY motility sperm transmission electron microscope
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Toxic effects of fluoranthene and copper on marine diatom Phaeodactylum tricornutum 被引量:7
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作者 WANG Liping ZHENG Binghui 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第11期1363-1372,共10页
To investigate the effects of polycyclic aromatic hydrocarbons (PAHs) and metals on the population reproduction,antioxidative defense system and cell ultrastructure of the marine diatom,fluoranthene and Cu2+ were sele... To investigate the effects of polycyclic aromatic hydrocarbons (PAHs) and metals on the population reproduction,antioxidative defense system and cell ultrastructure of the marine diatom,fluoranthene and Cu2+ were selected to test their toxicity to Phaeodactylum tricorntum,in the laboratory.The results indicated that both fluoranthene and Cu2+ inhibited population reproduction of P.tricorntum.When the algal cells were exposed to fluoranthene or Cu2+ for 72 h,ultrastructure damage in the cells was observed un... 展开更多
关键词 marine diatom polycyclic aromatic hydrocarbons (PAHs) heavy metals transmission electron microscope (TEM)
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Effects of Polysaccharides from Pulsatilla Decoction on the Microvascular Endothelial Glycocalyx 被引量:5
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作者 ZHANG Tao WU Shuang +2 位作者 SUN Xiong DUAN Hui-qin MU Xiang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2014年第11期2558-2561,共4页
Pulsatilla decoction is a famous traditional Chinese herbal formula for clearing heat and treating dysentery of animals or human. To elucidate its mechanism, many active components have been studied, however, the role... Pulsatilla decoction is a famous traditional Chinese herbal formula for clearing heat and treating dysentery of animals or human. To elucidate its mechanism, many active components have been studied, however, the roles of its polysaccharides still remain unclear. This study aimed to explore effects of polysaccharides from Pulsatilla decoction (PPD) on the microvascular endothelial glycocalyx (eGC). The polysaccharides were extracted from PPD by water extraction and alcohol precipitation method. Mice were administered with PPD for 4 wk, and were then anesthetized with ether inhalation and were ifxed by cardiac perfusion with gradient concentration alcian blue solution. The jejunum was sampled and jejunal mucosa was prepared for ultrathin sections by routine method and was analyzed by transmission electron microscope. The results indicated that the eGC was observed as a strong electron-dense smooth linear margin or nonuniform conglomerates coating cell membranes, and PPD signiifcantly increased its thickness from (21.85±1.87) to (28.71±3.61) nm and improved its integrity. This study suggested that PPD may express their biological activities and protect against pathogenic factor damages by inlfuencing the eGC. 展开更多
关键词 Pulsatilla decoction herbal polysaccharides GLYCOCALYX microvascular endothelial cells jejunal mucosa transmission electron microscope
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Rapid Biosynthesis of Silver Nanoparticles Using Cymbopogan Citratus (Lemongrass) and its Antimicrobial Activity 被引量:4
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作者 Shalaka A.Masurkar Pratik R.Chaudhari +1 位作者 Vrishali B.Shidore Suresh P.Kamble 《Nano-Micro Letters》 SCIE EI CAS 2011年第3期189-194,共6页
The present study deals with the rapid green synthesis of silver nanoparticles using fresh leaves of Cymbopogan Citratus(Lemongrass). Silver nanoparticles were formed within 8~10 minutes by microwave irradiation usin... The present study deals with the rapid green synthesis of silver nanoparticles using fresh leaves of Cymbopogan Citratus(Lemongrass). Silver nanoparticles were formed within 8~10 minutes by microwave irradiation using aqueous solution of Ag NO3(1 m M) with fresh leaves extract of Cymbopogan Citratus. The synthesized silver nanoparticles were characterized by using UV-visible spectrophotometer analysis, nanoparticle tracking analyzer, transmission electron microscope and energy dispersive X-ray spectra. The antibacterial activity of these nanoparticles was studied against multiple drug resistant hospital isolates of E.coli, S.aureus,P.mirabilis and hospital isolates of S. typhi, K.pnuemoniae. Also, the antifungal activity of these nanoparticles was studied against C.albicans(hospital isolate) and A.niger(NCIM 616). The synergistic effect of silver nanoparticles along with antibiotics was also studied against multiple drug resistant hospital isolates and found to be effective. The extracellular synthesis of Silver nanoparticles using leaves of Cymbopogan Citratus appears to be rapid and eco-friendly. 展开更多
关键词 Green synthesis Cymbopogan Citratus Nanoparticle tracking analyzer transmission electron microscope Energy dispersive X-ray spectra
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Study on the Ultrastructures of Antennal Sensilla in Helicoverpa armigera 被引量:2
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作者 WANG Gui-rong, GUO Yu-yuan and WU Kong-ming( State Key Laboratory of Plant Disease and Insect Pests, The Institute of Plant Protection , Chinese Academy of Agricultural Sciences, Beijing 100094 , P. R . China ) 《Agricultural Sciences in China》 CAS CSCD 2002年第8期896-899,共7页
The morphology and structures of antennal sensilla of Helicoverpa armigera are observed under scanning and transmission electron microscopes. Antennae of Helicoverpa armigera are made up of scapus, pedicel and flagell... The morphology and structures of antennal sensilla of Helicoverpa armigera are observed under scanning and transmission electron microscopes. Antennae of Helicoverpa armigera are made up of scapus, pedicel and flagellum that the latter consists of 70 - 82 segments. The inner side surface of antenna is cat-aphracted and most of the antennal sensilla lie on its outer, upper and lower surfaces. Both the antennae of male and female contain five kinds of antennal sensilla, namely, sensillum trichodeum, sensillum basicon-icum, sensillum chaeticum, ear-shaped sensillum and sensillum coeloconicum, and the kinds, number and distribution of antennal sensilla of both sexes are similar. There are a large number of serrate cuticular processes on antennal surface, especially on the middle and basic parts of antenna. Sensillum trichodeum and sensillum basiconicum, the main chemical odor receptors on antennae of Helicoverpa armigera, consist of cuticular-wall, sheath cells, lymph and dendrites. There are significant differences between the internal structures of the two kinds of sensilla. In sensillum trichodeum, the cuticular-wall is thicker, less lipophilic pore channels and has one or a few dendrites, while in sensillum basiconicum, the cuticular-wall is thinner, abundant lipophilic pore channels and has much more dendrites. 展开更多
关键词 Helicoverpa armigera Antennal sensillum Ultrastructures Scanning electron microscope transmission electron microscope
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Morphology and electrical conductivity of PACS 被引量:1
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作者 GAO Bao\|yu\+1, LIU Zong\|gang\+2, YUE Qin\|yan\+3, ZHAO Hua\|zhang\+3 (1. Department of Environmental Engineering, Shandong University, Jinan 250100, China 2. Environmental Monitoring Station of Huaiyin, Jinan 250022, China 3. Department of Environ 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2000年第3期319-324,共6页
Polyaluminium chlorides with sulfate ion(PACS) were prepared by using AlCl 3·6H 2O, Al(SO 4) 3·18H 2O and Na 2CO 3 as raw materials. The effects of basicity ( r ), Al 3+ /SO 4 2- molar r... Polyaluminium chlorides with sulfate ion(PACS) were prepared by using AlCl 3·6H 2O, Al(SO 4) 3·18H 2O and Na 2CO 3 as raw materials. The effects of basicity ( r ), Al 3+ /SO 4 2- molar ratio and aging time on the morphology of PACS were observed by transmission electrical microscope. The influence of aging time on charge neutralization and coagulation effect of PACS was studied. The effects of basicity ( r ), Al 3+ /SO 4 2- molar ratio and aging time on the electrical conductivity of PACS solution were also investigated. The experimental results show that the degree of polymerization of polyaluminium chloride(PAC) increases when SO 4 2- ion is added. The higher the basicity( r ) and the longer the aging time, the larger the size of polymer PACS. The ability of PACS neutralizing the charge on Kaolinite decreases with the increase of aging time. The electrical conductivity of PACS solution(the concentration of Al 3+ ion is 0.18 mol/L) with different aging time is the function of the basicity and Al 3+ /SO 4 2- molar ratios and has its maximum at r =0.5 and Al 3+ /SO 4 2- =12. 展开更多
关键词 coagulant PACS MORPHOLOGY transmission electron microscope electrical conductivity COAGULATION
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Corrosion behavior of Zr–Nb–Cr cladding alloys 被引量:1
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作者 Wei-Jia Gong Cong-Feng Wu +3 位作者 Hang Tian Xiao-Dong Ni Hai-Long Zhang Xi-Tao Wang 《Rare Metals》 SCIE EI CAS CSCD 2013年第5期480-485,共6页
Zr-Nb-Cr alloys were used to evaluate the effects of alloying elements Nb and Cr on corrosion behavior of zirconium alloys. The microstructures of both Zr substrates and oxide films formed on zirconium alloys were cha... Zr-Nb-Cr alloys were used to evaluate the effects of alloying elements Nb and Cr on corrosion behavior of zirconium alloys. The microstructures of both Zr substrates and oxide films formed on zirconium alloys were characterized. Corrosion tests reveal that the corro- sion resistance of ZrxNb0.1Cr (x = 0.2, 0.5, 0.8, 1.1; wt%) alloys is first improved and then decreased with the increase of the Nb content. The best corrosion resistance can be obtained when the Nb concentration in the Zr matrix is nearly at the equilibrium solution, which is closely responsible for the formation of columnar oxide grains with protective characteristics. The Cr addition degrades the corrosion resistance of the Zrl.lNb alloy, which is ascribed to Zr(Cr,Fe,Nb)2 precipitates with a much larger size than β-Nb. 展开更多
关键词 Zirconium alloys Corrosion PRECIPITATES Alloying elements transmission electron microscope
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Microstructures and deformation mechanisms of experimentally deformed gabbro
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作者 Yongsheng Zhou Changrong He 《Earthquake Science》 CSCD 2015年第2期119-127,共9页
The natural gabbro samples were deformed at temperature ranging from 700 to 1150 ℃ with strain rate steps of 1 ×10^-4, 2.5 ×10^-5, 6.3 ×10^-6 s^-1. The mechanical data show that sample experiences grad... The natural gabbro samples were deformed at temperature ranging from 700 to 1150 ℃ with strain rate steps of 1 ×10^-4, 2.5 ×10^-5, 6.3 ×10^-6 s^-1. The mechanical data show that sample experiences gradual transition from semi-brittle flow to plastic flow, corresponding to a systematically decreasing stress exponent n with the increasing temperature ranging from 16.5 to 4.1 (He et al. Sci China (D) 46(7):730-742, 2003). We investigate microstructures and deformation mechanisms of experimentally deformed gabbro under transmission electron microscope in this study. For low temperature of 700 ℃ to 950℃, the deformation is mainly accommodated with dislocation glide and mechanical twinning, corresponding to stress exponent lager than 5, which means semi-brittle deformation. Whereas with higher temperature up to 1000 ℃-1150 ℃, the deformation is accommodated mainly with dislocation glide and climb corresponding to stress exponent of 4.1, which means plastic deformation. Evidence of dislocation climb has been found as dislocation walls in plagioclase. The observed slip system in plagioclase is (001)1/21110] and that in clinopyroxene are (100)[001] and (010)[001]. The (010)[001] slip system in clinopyroxene is newly found in this work. Melt was found at temperature of 950 ℃-1050 ℃. The melt glass distributed both in melt thin film between two grain boundaries and melt tubules of triangular along three grain boundaries at temperature of 950℃-1000℃. The melt triangular interconnected to the melt film at temperature of 1050 ℃-1150℃, where the melt chemical compositiondifferentiated into iron-rich dark dots and silicate-rich matrix. 展开更多
关键词 MICROSTRUCTURE Deformation mechanism transmission electron microscope (TEM) Semi-brittlePlastic GABBRO
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Microstructure evolution of T91 steel after heavy ion irradiation at 550℃
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作者 Ligang Song Bo Huang +6 位作者 Jianghua Li Xianfeng Ma Yang Li Zehua Fang Min Liu Jishen Jiang Yanying Hu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第8期61-69,共9页
Fe-Cr ferritic/martensitic(F/M)steels have been proposed as one of the candidate materials for the Generation IV nuclear technologies.In this study,a widely-used ferritic/martensitic steel,T91 steel,was irradiated by ... Fe-Cr ferritic/martensitic(F/M)steels have been proposed as one of the candidate materials for the Generation IV nuclear technologies.In this study,a widely-used ferritic/martensitic steel,T91 steel,was irradiated by 196-MeV Kr^(+)ions at 550℃.To reveal the irradiation mechanism,the microstructure evolution of irradiated T91 steel was studied in details by transmission electron microscope(TEM).With increasing dose,the defects gradually changed from black dots to dislocation loops,and further to form dislocation walls near grain boundaries due to the production of a large number of dislocations.When many dislocation loops of primary a0/2<111>type with high migration interacted with other defects or carbon atoms,it led to the production of dislocation segments and other dislocation loops of a0<100>type.Lots of defects accumulated near grain boundaries in the irradiated area,especially in the high-dose area.The grain boundaries of martensite laths acted as important sinks of irradiation defects in T91.Elevated temperature facilitated the migration of defects,leading to the accumulation of defects near the grain boundaries of martensite laths. 展开更多
关键词 T91 steel high energy Kr ions irradiation irradiation defects transmission electron microscope(TEM)
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