Surface characterization by optical contact angle measuring system

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Adrianna Nogalska ◽  
Anna Trojanowska ◽  
Bartosz Tylkowski ◽  
Ricard Garcia-Valls
Keyword(s):  
Contact Angle ◽  
Surface Characterization ◽  
Pressure Control ◽  
Measuring System ◽  
Optical Contact ◽  
Wetting Properties ◽  
Current State ◽  
Angle Measuring ◽  
Versatile Tool

Abstract Constant development of novel materials and their characterization is a highly important matter nowadays. Optical contact angle measuring system is a very versatile tool among the surface characterization techniques. The main application of the technique is determination of hydrophobicity/hydrophilicity and wetting properties of materials. Current generation machines are fully automatized with a number of complements for temperature and pressure control, nanoliter drop generation, etc. Besides commenting on the current state of the art of the equipment, their capabilities and costs, this review includes some practical tips on the execution of the technique and data analysis.

An Opto-Electronic Integrated Non-Contact Angle Measuring System for Knife Blade Angle

2011 ◽  
Vol 317-319 ◽  
pp. 1016-1019
Author(s):  
Wen Qing Shi ◽  
Yu Jun Feng ◽  
Wen Hua Wang ◽  
Yong Qiang Li ◽  
Cun You Huang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Cost Saving ◽  
High Precision ◽  
Measuring System ◽  
Blade Angle ◽  
Laser Technology ◽  
Angle Measuring ◽  
Knife Blade ◽  
Safety And Stability ◽  
Operation Cost

in order to measure knife blade angle, which has a serious influence on the sharpness and sharpness retentivity of knives and scissors, a knife blade angle measuring system based on electronics and laser technology is established. This system has many advantages such as a high precision (±1°), convenient and simple operation, cost saving, non-contact, safety and stability, etc. The system is very helpful to improve the product qualities of knives and scissors.

scholarly journals Wetting Properties of Polyetheretherketone Plasma Activated and Biocoated Surfaces

2019 ◽  
Vol 3 (1) ◽  
pp. 40 ◽  
Author(s):  
Kacper Przykaza ◽  
Klaudia Woźniak ◽  
Małgorzata Jurak ◽  
Agnieszka Wiącek
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Contact Angle Hysteresis ◽  
Biologically Active ◽  
Adhesive Properties ◽  
Surface Sterilization ◽  
Wetting Properties ◽  
Angle Measuring ◽  
Modified Surface

Polyetheretherketone (PEEK) biomaterial is a polymer which has been widely used since the early 90s as a material for human bone implant preparations. Nowadays it is increasingly used due to its high biocompatibility and easily modeling, as well as better mechanical properties and price compared to counterparts made of titanium or platinum alloys. In this paper, air low-temperature and pressure plasma was used to enhance PEEK adhesive properties as well as surface sterilization. On the activated polymeric carrier, biologically-active substances have been deposited with the Langmuir-Blodgett technique. Thereafter, the surface was characterized using optical profilometry, and wettability was examined by contact angle measuring. Next, the contact angle hysteresis (CAH) model was used to calculate the surface free energy of the modified surface of PEEK. The variations of wettability and surface free energy were observed depending on the deposited monolayer type and its components.

Measurement of Wood Wettability by the Wilhelmy Method. Part 2. Determination of Apparent Contact Angles

Holzforschung ◽  
2001 ◽  
Vol 55 (1) ◽  
pp. 33-41 ◽  
Author(s):  
M.E.P. Wålinder ◽  
G. Ström
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Contact Angles ◽  
Liquid Density ◽  
Initial Part ◽  
Test Cycle ◽  
Wetting Properties ◽  
Surface Energetics ◽  
Efficient Control

Summary This work focuses on the determination of apparent contact angles on wood by the Wilhelmy method. In this method, the force acting on an object is measured during a test cycle involving immersion in and withdrawal from a probe liquid. Fresh and aged veneers of extracted and non-extracted heart- and sapwood of pine were investigated. The results indicate that wicking of the probe liquids, into and along the porous wood veneers, occurs during the test cycles and that this strongly affects the determination of contact angles. It is suggested that two different wicking phenomena occur. First, when the veneer contacts the liquid, an instantaneous ‘initial wicking’ occurs. It is suggested that this initial wicking is influenced primarily by the liquid density and structural properties of the specimen (such as porosity and surface roughness), and not by surface energetics. An initial wicking constant was therefore estimated for the different veneer samples based on measurements in octane. Second, after the initial wicking, a continuing ‘secondary wicking’ is observed. In some cases, this may result in zero contact angle after a certain immersion depth. Contact angles should, therefore, be estimated from the initial part of the immersion, where the secondary wicking can be neglected. This may also reduce any contamination of the probe liquids by extractives. The Wilhelmy method seems to be a valuable tool for estimating the wetting properties of wood, permitting reproducible measurements of apparent contact angles provided that there is efficient control of wicking and contamination effects.

Visualization of the Formation of Interfacially Polymerized Film by an Optical Contact Angle Measuring Device

2012 ◽  
Vol 116 (21) ◽  
pp. 11496-11506 ◽  
Author(s):  
Fang Yuan ◽  
Zhi Wang ◽  
Xingwei Yu ◽  
Zhihong Wei ◽  
Shichun Li ◽  
...  
Keyword(s):  
Contact Angle ◽  
Optical Contact ◽  
Measuring Device ◽  
Angle Measuring

scholarly journals Contact Angle Measurement for The Surface Characterization of Solids

2011 ◽  
Vol 2 ◽  
pp. 1-4 ◽  
Author(s):  
D. P. Subedi
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Surface Characterization ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Liquid Model ◽  
Convenient Approach ◽  
Young's Equation

This paper reports a description of the theory of contact angle measurement and its use for the determination of surface energy of solids. The main objective of the work is to present a convenient approach to explain wetting phenomenon using contact angle theory. A brief review of Young’s equation and Young- Dupre equation is also presented followed by an extended Fowke’s equation widely used for the calculation of surface energy of solids. The two liquid model has been applied to determine the surface energy of polycarbonate and low density polyethylene.Key words: Contact angle; Surface energy; Surface characterization; Wettability; Young’s equation; Fowke’s modelThe Himalayan Physics Vol.2, No.2, May, 2011Page:1-4Uploaded Date: 31 July, 2011

Review of the Current State and Future Development in Standardizing Natural Lighting in Interiors

2018 ◽  
pp. 5-26 ◽  
Author(s):  
Stanislav Darula
Keyword(s):  
Human Life ◽  
Natural Light ◽  
Artificial Lighting ◽  
Computer Tools ◽  
Natural Lighting ◽  
Current State ◽  
Minimum Requirements ◽  
Life On Earth ◽  
Window Design

Three elements mainly wind, water and sun seemed to determine in ancient ages the basic phenomena of life on Earth. Architectural history documented the importance of sun influence on urban and building construction already in layouts of Mesopotamian and Greek houses. Not only sun radiation but especially daylight played a significant role in the creation of indoor environment. Later, in the 20th century, a search of interaction between human life in buildings and natural conditions were studied considering well­being and energy conscious design recently using computer tools in complex research and more detail interdisciplinary solutions. At the same time the restricted daytime availability of natural light was supplemented by more efficient and continually cheaper artificial lighting of interiors. There are two main approaches to standardize the design and evaluation of indoor visual environment. The first is based on the determination of the minimum requirements respecting human health and visibility needs in all activities while the second emphasizes the behaviour and comfort of occupants in buildings considering year­around natural changes of physical quantities like light, temperature, noise and energy consumption. The new current standardization basis for daylight evaluation and window design criteria stimulate the study of methodology principles that historically were based on the overcast type of sky luminance pattern avoiding yearly availability of sky illuminance levels. New trends to base the daylight standardization on yearly or long­term availability of daylight are using the averages or median sky illuminance levels to characterise local climatological conditions. This paper offers the review and discussion about the principles of the natural light standardization with a short introduction to the history and current state, with a trial to focus on the possible development of lighting engineering and its standards in future.

Disability as a social phenomenon

2020 ◽  
pp. 22-38
Author(s):  
Natalia Guseva ◽  
Vitaliy Berdutin
Keyword(s):  
Social Protection ◽  
Russian Society ◽  
Stage Model ◽  
High Quality ◽  
Rehabilitation Programs ◽  
Current State ◽  
The Social ◽  
Consistent Solution ◽  
First Time

At present, the problem of establishing disability is a point at issue in Russia. Despite the fact that medical criteria for disability are being developed very actively, high-quality methods for assessing social hallmarks are still lacking. Since disability is a phenomenon inherent in any society, each state forms a social and economic policy for people with disabilities in accordance with its level of development, priorities and opportunities. We have proposed a three-stage model, which includes a system for the consistent solution of the main tasks aimed at studying the causes and consequences of the problems encountered today in the social protection of citizens with health problems. The article shows why the existing approaches to the determination of disability and rehabilitation programs do not correspond to the current state of Russian society and why a decrease in the rate of persons recognized as disabled for the first time does not indicate an improvement in the health of the population. The authors proposed a number of measures with a view to correcting the situation according to the results of the study.

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