scholarly journals Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 114 ◽  
Author(s):  
Xianchen Wang ◽  
Qin Zhang
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Sem Analysis ◽  
Hydrophilic Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
The Difference ◽  
The Relationship ◽  
Insight Into ◽  
Phosphate Flotation

Surface roughness has an important influence on the wettability of particles. This paper is an innovative exploration to control the surface wettability of apatite and dolomite from the perspective of roughness in the background of phosphate flotation. Roughness characteristics of apatite and dolomite particles and its effects on wettability were investigated with surface roughness, contact angle measurements, and SEM analysis. The relationship between surface energy and wettability of different roughness surfaces was also discussed. The results indicated that the influence of roughness on apatite and dolomite particles showed the same regularity, and wettability increased with the increasing roughness for hydrophilic surfaces, while the wettability decreased for hydrophobic surfaces. The influence of roughness on wettability can be well explained by Wenzel and Cassie models, and the surface energy of different rough surfaces had a strong correlation with their wettability. When sodium oleate was added after acid treatment, the apatite was hydrophilic, while the dolomite was hydrophobic; the difference in wettability between them became greater as surface roughness increased. Thus, it can be predicted that the selective separation of dolomite and apatite under acid reverse flotation conditions can be strengthened by increasing the mineral surface roughness during comminution.

scholarly journals Epoxy/alumina composite coating on welded steel 316L with excellent wear and anticorrosion properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maryama Hammi ◽  
Younes Ziat ◽  
Zakaryaa Zarhri ◽  
Charaf Laghlimi ◽  
Abdelaziz Moutcine
Keyword(s):  
Electrochemical Behaviour ◽  
Sem Analysis ◽  
Water Contact ◽  
Welded Steel ◽  
Melted Zone ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Alumina Composite ◽  
The Cost ◽  
Good Contrast

AbstractThe main purpose of this study is to elaborate anticorrosive coatings for the welded steel 316L, since this later is widely used in industrial field. Hence, within this work we have studied the electrochemical behaviour of different zones of the welded steel 316 in 1 M HCl media. The macrography study of the welded steel has revealed the different areas with a good contrast. We have stated three different zones, namely; melted zone (MZ), heat affected zone (HAZ) and base metal zone (BM). Impedance studies on welded steel 316L were conducted in 1 M HCl solution, coating of Epoxy/Alumina composite was applied on different zones, in order to reveal the anti-corrosion efficiency in each zone. Scanning electron microscopy (SEM) analysis was undertaken in order to check how far the used coating in such aggressive media protects the studied zones and these findings were assessed by water contact angle measurements. The choice of this coating is based on the cost and the safety. We concluded that the Epoxy/Alumina composite has a good protecting effect regarding welded steel in aggressive media.

Influence of TiO2 on Selfclean Bio Coating

2013 ◽  
Vol 315 ◽  
pp. 399-403 ◽  
Author(s):  
Nurulsaidatulsyida Sulong ◽  
Anika Zafiah Mohd Rus
Keyword(s):  
Contact Angle ◽  
Organic Contaminants ◽  
Concrete Surface ◽  
Waste Cooking Oil ◽  
Water Repellent ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
The Difference ◽  
Micro Features ◽  
Coated Surfaces

Treatment on the exposed surface to the environmental attack was studied based on biopolymer coating from waste cooking oil doped with a superhydrophilic filler of Titanium Dioxide (TiO2), known as TOP. TOP was found to affect the physical properties of the coated concrete surface in a systematic way. Contact angle measurements are interpreted with respect to nanoand micro-features existing on the surface of the water repellent superhydrophilic filler filled bio-polymer composite coating. The smooth coated surfaces of polymer filled or doped with superhydrophobic filler shows the systematic increasing static Waste Contact Angle, WCA (θst) and revealed that polymer filled superhydrophobic fillers by only 2.0 % shows the ability to form superhydrophobicity property. Scanning Electron Microscope (SEM) pictures revealed the difference between the concrete surface roughness of concrete biopolymer with and without TOP coating is to provide self-cleaning concrete biopolymer coating based on two principal ways: (1) the development of surface coating of semiconducting photocatalytic superhydrophilic. (2) If such a superhydrophilic is illuminated by light, then grease, dirt and organic contaminants will be decomposed and can easily be swept away by rain.

scholarly journals Comments on “An Essay on Contact Angle Measurements”: Determination of Surface Roughness and Modeling of the Wetting Behavior

2011 ◽  
Vol 8 (11) ◽  
pp. 998-1002 ◽  
Author(s):  
Antonia Terriza ◽  
Rafael Alvarez ◽  
Francisco Yubero ◽  
Ana Borras ◽  
Agustin R. González-Elipe
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Wetting Behavior ◽  
Angle Measurements ◽  
Contact Angle Measurements

Surface Energy and Wetting Behaviour of Plasma Etched Porous SiCOH Surfaces and Plasma Etch Residue Cleaning Solutions

2009 ◽  
Vol 145-146 ◽  
pp. 319-322 ◽  
Author(s):  
Nicole Ahner ◽  
Matthias Schaller ◽  
Christin Bartsch ◽  
Eugene Baryschpolec ◽  
Stefan E. Schulz
Keyword(s):  
Surface Energy ◽  
Dielectric Materials ◽  
Solid Surfaces ◽  
Plasma Etch ◽  
Surface Energies ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Additional Process ◽  
Low K ◽  
Etch Residue

The removal of plasma etch residues by wet cleaning is an alternative or additional process to plasma processes, which are known to degrade low-k and ultralow-k dielectric materials. Besides Cu/low-k compatibility wetting is an important issue for wet cleaning. Surface energy of solid and liquid is the key to understand the wetting behaviour. In this study we examined the energetic character of plasma etched/stripped solid surfaces, etch polymers and several cleaning solutions by contact angle measurements. The results show, that variations of the etching process can heavily change the energetic character of the solid. Calculating the surface energies of solid and liquid provides the possibility to make a prediction if a cleaning liquid will wet the surface which has to be cleaned.

The deformation and fracture of β-HMX

1982 ◽  
Vol 383 (1785) ◽  
pp. 399-407 ◽  
Keyword(s):  
Surface Energy ◽  
Compressive Loading ◽  
Mechanical Deformation ◽  
Angle Measurements ◽  
A Value ◽  
Deformation And Fracture ◽  
Deformation Properties ◽  
Contact Angle Measurements ◽  
Micro Indentation ◽  
Secondary Explosive

A study has been made of the mechanical deformation properties of β-HMX, an important secondary explosive. It is shown that under compressive loading twinning takes place on the (101)-plane. At low loads, this twinning is elastic and usually precedes fracture. Cleavage in β-HMX takes place on the {011}-planes. The fracture surface energy of 0.06 J m -2 has been determined by a micro-indentation technique. This compares with a value of 0.045 J m -2 obtained for the thermodynamic surface energy from contact-angle measurements. The values suggest that there is relatively little energy loss by plastic deformation associated with crack propagation in HMX compared with, for example, the secondary explosives PETN and RDX. Despite this brittleness the twin deformation allows β-HMX to undergo large changes of shape: the significance of this in plastic-bonded explosives is commented on.

scholarly journals PUBLIC RELATIONS IN LATVIA AT THE BEGINNING OF THE 21ST CENTURY: SUPPORTING FUNCTION OF THE ORGANIZATION’S MANAGEMENT AND / OR MARKETING

2010 ◽  
Vol 1 (2) ◽  
pp. 301
Author(s):  
Inga Pūre
Keyword(s):  
Public Relations ◽  
21St Century ◽  
Supporting Function ◽  
Public Relations Practitioners ◽  
Limited Length ◽  
The Difference ◽  
Management Functions ◽  
The Relationship ◽  
Insight Into

Public Relations (PR) in Latvia is a new cross - disciplinary branch, the beginning of which dates back to the gaining of independence. It has rapidly developed during the last twenty years. The interpretation of Public Relations though is still problematic. A lot of heads of establishments do not realize the importance of Public Relations in the development of enterprises. They do not see the difference between Public Relations and marketing. Public Relations is often viewed as a marketing supporting function. The aim of the article is to show the role of Public Relations as one of the essential management functions, explain and analyse the relationship between Public Relations and marketing, as well as to find the reason for the scarcity of the insight into what Public Relations is and offer the solution to the problem in regard to the situation in Latvia. The article offers analysis of the facts obtained from 25 detailed interviews with leading Public Relations practitioners and theoreticians as well as the analysis of the theoretical literature and other sources. All interviews could not be viewed in the article because of its limited length.

scholarly journals Evaluation of the Relationship Among Dressing Conditions Using Prismatic Dresser, Dressing Resistance, and Grinding Characteristics

2022 ◽  
Vol 16 (1) ◽  
pp. 12-20
Author(s):  
Gen Uchida ◽  
Takazo Yamada ◽  
Kouichi Ichihara ◽  
Makoto Harada ◽  
Tatsuya Kohara ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Condition ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Practical Application ◽  
Wheel Surface ◽  
The Difference ◽  
Ground Surface Roughness ◽  
The Relationship

In the grinding process, the grinding wheel surface condition changes depending on the dressing conditions, which affects the ground surface roughness and grinding resistance. Several studies have been reported on the practical application of dressing using prismatic dressers in recent years. However, only a few studies that quantitatively evaluate the effects of differences in dressing conditions using prismatic dresser on the ground surface roughness and grinding resistance have been reported. Thus, this study aims to evaluate quantitatively the effect of the difference in dressing conditions using the prismatic dresser on the ground surface roughness and grinding resistance by focusing on the dressing resistance. In the experiment, dressing is performed by changing the dressing lead and the depth of dressing cut with a prismatic dresser, and the ground surface roughness and grinding resistance are measured. Consequently, by increasing the dressing lead and the depth of dressing cut, the ground surface roughness increased, and the grinding resistance decreased. This phenomenon was caused by the increase in dressing resistance when the dressing lead and the depth of dressing cut were increased, which caused a change in the grinding wheel surface condition. Furthermore, the influence of the difference in dressing conditions using the prismatic dresser on the ground surface roughness and grinding resistance can be quantitatively evaluated by using the dressing resistance.

Adhesion of Aeromonas hydrophila to Water Distribution System Pipes after Different Contact Times

1998 ◽  
Vol 61 (10) ◽  
pp. 1321-1329 ◽  
Author(s):  
MAFU AKIER ASSANTA ◽  
DENIS ROY ◽  
DIANE MONTPETIT
Keyword(s):  
Stainless Steel ◽  
Surface Energy ◽  
Aeromonas Hydrophila ◽  
Distribution System ◽  
Water Distribution ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Extracellular Materials ◽  
And Storage ◽  
Storage Temperatures

Scanning electron microscopy observation was used to investigate the ability of Aeromonas hydrophila to attach to various water distribution pipe surfaces, such as stainless Steel, copper, and polybutylene, after different contact times at ambient and storage temperatures. Surface energy value of each surface was estimated by contact angle measurements using water, α-bromonaphthalene, and dimethyl sulfoxide. Our results indicated that Aeromonas cells could easily attach to all surface types after exposures as short as 1 or 4 h at both temperatures (4 and 20°C). Polybutylene, a low-energy surface (41.2 mJ-m−2), followed by stainless Steel (65.7 mJ-m−2), was most colonized by Aeromonas cells, whereas few cells were observed on copper, which has a surface energy of 45.8 mJ-m−2. Extracellular materials could also be observed on polybutylene surfaces, especially after 1 and 4 h of exposure at the refrigeration temperature.

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