TEM Studies of Cement Hydration

1986 ◽  
Vol 85 ◽  
Author(s):  
G. W. Groves
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cement Hydration ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Effect Of Water ◽  
Transmission Electron ◽  
Detailed Evaluation ◽  
Relationship Of ◽  
The Relationship

ABSTRACTThe application of transmission electron microscopy to the study of the early stages of hydration C3S and the microstructure of very mature C3 S paste is reported. In the former case the effect of water-cement ratio appears to be very important. In the latter, a detailed evaluation of the microstructures of inner C-S-H, outer C-S-H and CH is possible and the relationship of these to models of cement hydration is discussed.

Epitaxial Gold in Au/Si Eutectic Reaction and Epitaxial Aluminum Spikes in Al-1%Si/Ti-W/Si System

1988 ◽  
Vol 116 ◽  
Author(s):  
Peng-Heng Chang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Epitaxial Growth ◽  
Orientation Relationship ◽  
Gold Film ◽  
Eutectic Reaction ◽  
Orientation Relationships ◽  
Transmission Electron ◽  
Relationship Of ◽  
The Relationship

AbstractEpitaxial regrowth of gold film on Si as a result of Au/Si eutectic reaction and epitaxial aluminum spikes forming at IC contacts during sintering have been investigated by transmission electron microscopy (TEM). For gold film on Si, three types of epitaxy were observed: (1) the crystal structures of the two lattices are exactly the same, (2) the two structures have the orientation relationship of Au(111)//Si(111) and Au[132]//Si[231] and (3) 20° misorientation from the relationship in (2). Two orientation relationships were observed in the case of Al spike in Si: (1) Al[011]//Si[123] and Al(200)//Si(11), (2) Al[001]//Si[112] and 2° misorientation between Al(200) and Si(111). Possible mechanisms are proposed to explained the observed epitaxial growth.

Eocronartium muscicola: a basidiomycetous moss parasite exploiting gametophytic transfer cells

1988 ◽  
Vol 66 (4) ◽  
pp. 762-770 ◽  
Author(s):  
E. W. A. Boehm ◽  
D. J. McLaughlin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Transfer Cells ◽  
Transmission Electron ◽  
Host Parasite ◽  
Relationship Of ◽  
The Relationship ◽  
Gain Access ◽  
Scanning Electron

The host–parasite interface in Eocronartium muscicola, Auriculariales sensu lato, was examined histologically for 6 of the 21 reported moss hosts, using light microscopy, scanning electron microscopy, and transmission electron microscopy. A unique mode of fungal biotrophy was encountered in 5 of the 6 mosses analyzed, in which E. muscicola exploits gametophytic host transfer cells concomitant with varying degrees of supplantation of the moss sporophyte. Basidiocarps are restricted in these mosses to postfertilized archegonia, in which they are seen to associate with the sporophyte foot region, where they gain access to the host transfer cell nutritional interface. Basidiocarp ontogeny is presented as it relates to the development of the host–parasite interface. The relationship of E. muscicola to other simple-septate auricularioid taxa and the the Uredinales is discussed.

Preparation of Freeze-Stopped Rat Liver Tissue for Transmission Electron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 332-333 ◽  
Author(s):  
B. S. Lim ◽  
R. Veech ◽  
R. Slovis ◽  
J. D. Solomon
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Dehydrogenase Activity ◽  
Rat Liver ◽  
Liver Tissue ◽  
Transmission Electron ◽  
Centrifuge Tube ◽  
Glutamate Dehydrogenase Activity ◽  
Relationship Of ◽  
The Relationship

The relationship of morphological integrity and viability of mitochondria in freeze-stopped cells is of considerable interest and importance to biological scientists. This study represents the preliminary work for obtaining ultrastructural data for comparison with glutamate dehydrogenase activity, a marker for mitochondria protein, on freeze-stopped liver tissue from the rat.The pellets of ground freeze-stopped rat liver were fixed in three different ways: (l) OsO4 fume fixation. The fixing chamber consists of a capped plastic centrifuge tube containing an open ampule of OsO4 crystals. The chamber was maintained at -90°C at all time before and during fixation. After an overnight fixing, the tissue pellets were gradually brought to 4°C in a refrigerator and postfixed in glutaraldehyde.

Stress Relaxation Behavior of GH4169 Alloy

2020 ◽  
Vol 1013 ◽  
pp. 52-58
Author(s):  
Xu Dong Lu ◽  
Song Yi Shi ◽  
Bo Wen ◽  
Ya Wei Zhang ◽  
Jin Hui Du
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Stress Relaxation ◽  
Initial Stress ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Transmission Electron ◽  
Microscopy Techniques ◽  
The Relationship ◽  
Gh4169 Alloy

The relaxation properties of GH4169 alloy were studied contrastively at temperatures ranging from 600 oC to 700 °C and initial stress ranging from 550 MPa to 850 MPa. The relationship between the microstructure and relaxation behavior was evaluated using transmission electron microscopy techniques. It was found that the relaxation limit and relaxation stability of the alloy decreased obviously with the increase of temperature. Further investigations show that the relaxation behavior is mainly depend on both precipitate characteristics and its interaction with dislocations. The alloy with higher strength lever has more excellent stress relaxation stability, because of the inhibition of a large number subgrains on dislocations motion.

The Dislocation Patterns in Deformed Metals: Dislocation Densities, Distributions and Related Misorientations

2007 ◽  
Vol 550 ◽  
pp. 193-198
Author(s):  
Edgar F. Rauch ◽  
G. Shigesato
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Dislocation Substructure ◽  
Metals And Alloys ◽  
The Past ◽  
Transmission Electron ◽  
Dislocation Densities ◽  
Broad Variety ◽  
The Relationship

The dislocation substructure that appears in deformed metals and alloys have been extensively investigated in the past by transmission electron microscopy (TEM). They are known to form a broad variety of microstructures. These substructures are characterized by three main parameters, namely the density of the dislocations that are trapped in the tangles, their degree of patterning and the misorientation between the cells. The aim of the present work is to investigate the relationship between these features and the mechanical properties of the material.

Localized dissolution of grain boundary T1 precipitates in Al-3Cu-2Li

2015 ◽  
Vol 33 (6) ◽  
pp. 395-401 ◽  
Author(s):  
Ramasis Goswami
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Boundary ◽  
Orientation Relationship ◽  
S Phase ◽  
Dissolution Behavior ◽  
Moist Air ◽  
Orientation Relation ◽  
Transmission Electron ◽  
Relationship Of

AbstractTransmission electron microscopy (TEM) was employed to investigate the dissolution behavior of nanocrystalline grain boundary T1 precipitates in Al-3Cu-2Li. These grain boundary T1 plates exhibit an orientation relation with matrix, with the (1-11)α-Al parallel to (0001)T1 and [022]α-Al parallel to [10-10]T1, which is similar to the orientation relationship of T1 plates formed within grains. TEM studies showed that these grain boundary T1 plates react readily in moist air. As a result of the localized dissolution, the Cu-rich clusters form onto T1, which is consistent with the localized dissolution behavior observed in nanocrystalline S phase in Al-Cu-Mg.

Research Based on Scanning Electron Microscopy to Determine Original Water-Cement Ratio of Hardened Concrete

2014 ◽  
Vol 936 ◽  
pp. 1485-1489 ◽  
Author(s):  
Yue Li ◽  
Huan Tong ◽  
Jin Bo Yang ◽  
Wan Guo Dong
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Experimental Results ◽  
Hardened Concrete ◽  
Capillary Porosity ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
The Relationship ◽  
Original Water ◽  
Scanning Electron

In order to detect the influence of age on the experiment that use scanning electron microscopy (SEM) to determinate the original water-cement ratio (w/c) of hardened concrete, a series of concrete mixes are tested. Experimental results show that early ages do have an effect on the water-cement ratio of hardened concrete that determined from scanning electron microscopy, this effect will decrease while age increases. The relationship between capillary porosity, w/c and age is analyzed and a calculation equation is given.

True Atomic Level Imaging of Shaped Nanoparticles Composed of Bismuth, Antimony and Tellurium using Scanning Transmission Electron Microscopy.

2011 ◽  
Vol 1349 ◽  
Author(s):  
Derrick Mott ◽  
Nguyen T. Mai ◽  
Teruyoshi Sakata ◽  
Mikio Koyano ◽  
Koichi Higashimine ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atomic Structure ◽  
Scanning Transmission Electron Microscopy ◽  
Level Structure ◽  
Atomic Level ◽  
Transmission Electron ◽  
Bismuth Antimony ◽  
Scanning Transmission ◽  
The Relationship

ABSTRACTNanotechnology is an area of research that is highly intriguing because of the novel properties often observed for materials whose sizes are reduced to the nanoscale. However, one of the biggest challenges is understanding the underlying principles that dictate the particles resulting properties. The atomic level structure for nanoparticles is suspected to vary from that for the corresponding bulk materials, however, direct observation of this phenomenon has proven difficult. Until recently only indirect information on the atomic level structure of such materials could be obtained with techniques such as XRD, HR-TEM, XPS, etc… However, recent advances in Transmission Electron Microscopy techniques now allow true atomic scale resolution, leading to definitive confirmation of the atomic structure. Namely, Scanning Transmission Electron Microscopy coupled with a High-angle Annular Dark Field detector (STEM-HAADF) has been demonstrated to be capable of achieving a nominal resolution of 0.8 nm (the JEOL JEM-ARM200F instrument). The ability is highly exciting because it will lead to an enhanced understanding of the relationship between atomic structure of nanoparticles and the resulting novel properties. In our own study, we focus on the analysis of the atomic level structure for nanoparticles composed of bismuth, antimony and tellurium for thermoelectric materials. This area has recently received much interest because of the realization that nanotechnology can be employed to greatly enhance the efficiency (dimensionless figure of merit ZT) of this class of materials. One of the most intriguing parameters leading to the enhanced TE activity is the relationship between composition and structure that exists within individual nanoparticles. We report our results on a study of the atomic level structure for both nanowires and nanodiscs composed of bismuth, antimony and tellurium. It was found that the nanoparticles have a complex structure that cannot be elucidated by conventional techniques such as XRD or HR-TEM. In addition, by employing Energy Dispersive Spectroscopy (EDS), a greater understanding of the composition-structure dependence was gained. The results are primarily discussed in terms of the atomic level resolution images obtained with the STEM-HAADF technique.

The Preventive Effect of IL-1beta Antagonist on Diabetic Peripheral Neuropathy

2020 ◽  
Vol 20 (5) ◽  
pp. 753-759 ◽  
Author(s):  
Zheng Hangping ◽  
Han Ling ◽  
Ji Lijin ◽  
Zhao Wenting ◽  
Liu Xiaoxia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Peripheral Neuropathy ◽  
Diabetic Neuropathy ◽  
Diabetic Peripheral Neuropathy ◽  
Interleukin 1 ◽  
Diabetic Rats ◽  
Transmission Electron ◽  
Potential Strategy ◽  
The Relationship

Objective: To investigate the relationship between Interleukin-1beta (IL-1beta) and diabetic peripheral neuropathy (DPN) using animal models. Materials: The rat model of diabetic neuropathy was induced by intraperitoneal injection of a single dose of streptozotocin (STZ) at 65mg/kg. Diabetic rats were randomly divided into two groups (10 each), one treated with 0.9% saline (DMS group) and the other with interleukin-1 receptor antagonist (IL-1RA) at 50mg/kg (DMI group) twice a day for 5 weeks. Ten normal rats matched for weight, age and sex served as normal controls (Con group) and were treated with saline. Morphologic studies of sciatic nerves were achieved using light and transmission electron microscopy. Results: Transmission electron microscopy of the sciatic nerve showed the ultrastructure of myelin and the axon in the IL-1RA group was highly protected compared to diabetic controls. Conclusions: High levels of circulating IL-1beta may be associated with the risk of DPN and anti-IL-1 treatment may provide a potential strategy for the prevention of diabetic neuropathy.

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