scholarly journals Adhesion characterization of tungsten mine waste geopolymeric binder. Influence of OPC concrete substrate surface treatment

2008 ◽  
Vol 22 (3) ◽  
pp. 154-161 ◽  
Author(s):  
Fernando Pacheco-Torgal ◽  
J.P. Castro-Gomes ◽  
Said Jalali
Keyword(s):  
Surface Treatment ◽  
Mine Waste ◽  
Substrate Surface ◽  
Tungsten Mine

scholarly journals Detailed Characterization of the Effect of Application of Commercially Available Surface Treatment Agents on Textile Wetting Behavior

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 219 ◽  
Author(s):  
Johannes Staudt ◽  
Stephan Leyer ◽  
John Duchowski
Keyword(s):  
Surface Energy ◽  
Surface Treatment ◽  
Substrate Surface ◽  
Measurement Techniques ◽  
Work Of Adhesion ◽  
Wetting Behavior ◽  
Angle Measurements ◽  
Surface Active Agents ◽  
The Individual

The change in the wetting behavior of a standard commercially available textile material in response to surface treatment has been thoroughly characterized with conventional laboratory measurement techniques. The characterization was carried out by taking a series of contact angle measurements that allowed for the determination of the corresponding shift in substrate surface energy as a result of the applied treatment. The collected surface energy values were expressed in terms of the spreading parameter S, which was used to describe phase behavior at the substrate/droplet interface. However, these results showed that the use of a coarse parameter S, or even the work of adhesion ( W a ) and the work of cohesion ( W c ) parameters alone did not adequately account for the observed wetting behavior. A proper description of droplet formation on substrate surface was provided only when the interfacial interaction was examined at a more detailed level by involving the individual dispersive ( σ l d , σ s d ) and polar ( σ l p , σ s p ) surface energy components of both the solid and the wetting liquid. The methodology for characterization of interactions between a textile substrate coated with various surface active agents and several functional fluids have been developed. Several practical examples of how this methodology can be applied to describe the substrate surface treatment and the resulting wetting behavior are described herein.

TEM characterization of silicon epitaxial layer grown on Si-TaS2, eutectic composites

1991 ◽  
Vol 49 ◽  
pp. 802-803
Author(s):  
C.M. Sung ◽  
M. Levinson ◽  
M. Tabasky ◽  
K. Ostreicher ◽  
B.M. Ditchek
Keyword(s):  
Substrate Surface ◽  
Bulk Sample ◽  
Surface Cleaning ◽  
Native Oxide ◽  
Czochralski Growth ◽  
Ion Milling ◽  
Cross Sectional ◽  
Cleaning Methods ◽  
Field Emission Cathodes

Directionally solidified Si/TaSi2 eutectic composites for the development of electronic devices (e.g. photodiodes and field-emission cathodes) were made using a Czochralski growth technique. High quality epitaxial growth of silicon on the eutectic composite substrates requires a clean silicon substrate surface prior to the growth process. Hence a preepitaxial surface cleaning step is highly desirable. The purpose of this paper is to investigate the effect of surface cleaning methods on the epilayer/substrate interface and the characterization of silicon epilayers grown on Si/TaSi2 substrates by TEM.Wafers were cut normal to the <111> growth axis of the silicon matrix from an approximately 1 cm diameter Si/TaSi2 composite boule. Four pre-treatments were employed to remove native oxide and other contaminants: 1) No treatment, 2) HF only; 3) HC1 only; and 4) both HF and HCl. The cross-sectional specimens for TEM study were prepared by cutting the bulk sample into sheets perpendicular to the TaSi2 fiber axes. The material was then prepared in the usual manner to produce samples having a thickness of 10μm. The final step was ion milling in Ar+ until breakthrough occurred. The TEM samples were then analyzed at 120 keV using the Philips EM400T.

scholarly journals Compositional, structural, and surface characterization of heat-treated halloysite samples: Influence of surface treatment on photochemical activity

2021 ◽  
Vol 212 ◽  
pp. 106222
Author(s):  
Balázs Zsirka ◽  
Veronika Vágvölgyi ◽  
Katalin Győrfi ◽  
Erzsébet Horváth ◽  
Róbert K. Szilágyi ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Surface Characterization ◽  
Photochemical Activity ◽  
Heat Treated

scholarly journals Properties of tungsten mine waste geopolymeric binder

2008 ◽  
Vol 22 (6) ◽  
pp. 1201-1211 ◽  
Author(s):  
Fernando Pacheco-Torgal ◽  
João Castro-Gomes ◽  
Said Jalali
Keyword(s):  
Mine Waste ◽  
Tungsten Mine

Characterization of Mine Waste from a Former Pb–Zn Mining Site: Reactivity of Minerals During Sequential Extractions

2021 ◽  
Author(s):  
Valérie Cappuyns ◽  
Van Axelle Campen ◽  
Srećko Bevandić ◽  
Jillian Helser ◽  
Philippe Muchez
Keyword(s):  
Mine Waste ◽  
Sequential Extractions ◽  
Mining Site

Utilization of tailings from tungsten mine waste as a substitution material for cement

2009 ◽  
Vol 23 (7) ◽  
pp. 2481-2486 ◽  
Author(s):  
Yun Wang Choi ◽  
Yong Jic Kim ◽  
Ook Choi ◽  
Kwang Myong Lee ◽  
Mohamed Lachemi
Keyword(s):  
Mine Waste ◽  
Tungsten Mine

Characterization of Alloy 214 After Exposure to Superheated Steam at 800 °C

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Nick Tepylo ◽  
Rainier Garcia Sanchez ◽  
Xiao Huang
Keyword(s):  
Weight Gain ◽  
Supercritical Water ◽  
Weight Change ◽  
Superheated Steam ◽  
Substrate Surface ◽  
Surface Oxidation ◽  
Metal Substrate ◽  
Cr Content

In this study, an Al-containing alloy 214 was evaluated in superheated steam at 800 °C for a duration of 600 h. The purpose of using superheated steam was to simulate the supercritical water (SCW) condition at higher temperatures where no commercial SCW rig is currently capable of reaching (800 °C and beyond). After exposure to superheated steam, the weight change and surface oxidation were analyzed. Alloy 214 experienced greater weight gain than IN 625 and Ni20Cr5Al, due to its low Cr content. Formation of both Cr2O3 and Al2O3 was observed on the surface after 300 and 600 h of exposure. However, as exposure progressed, more Ni and Mn-containing spinel started to form, signaling Cr and Al depletion on the metal substrate surface.

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