Urine Advancing Contact Angle on Several Surfaces

2009 ◽  
Vol 23 (15) ◽  
pp. 1917-1923 ◽  
Author(s):  
Evan A. Thomas ◽  
Darwin H. Poritz ◽  
Dean L. Muirhead
Keyword(s):  
Contact Angle ◽  
Advancing Contact Angle

Spontaneous Spreading of a Droplet: The Role of Solid Continuity and Advancing Contact Angle

Langmuir ◽  
2018 ◽  
Vol 34 (17) ◽  
pp. 4945-4951 ◽  
Author(s):  
Youhua Jiang ◽  
Yujin Sun ◽  
Jaroslaw W. Drelich ◽  
Chang-Hwan Choi
Keyword(s):  
Contact Angle ◽  
Advancing Contact Angle

scholarly journals Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

2012 ◽  
Vol 9 (73) ◽  
pp. 1965-1974 ◽  
Author(s):  
A. Roth-Nebelsick ◽  
M. Ebner ◽  
T. Miranda ◽  
V. Gottschalk ◽  
D. Voigt ◽  
...  
Keyword(s):  
Contact Angle ◽  
Leaf Surface ◽  
Contact Angle Hysteresis ◽  
Maximum Size ◽  
Large Degree ◽  
Namib Desert ◽  
Fog Water ◽  
Water Conduction ◽  
Key Factor ◽  
Advancing Contact Angle

The Namib grass Stipagrostis sabulicola relies, to a large degree, upon fog for its water supply and is able to guide collected water towards the plant base. This directed irrigation of the plant base allows an efficient and rapid uptake of the fog water by the shallow roots. In this contribution, the mechanisms for this directed water flow are analysed. Stipagrostis sabulicola has a highly irregular surface. Advancing contact angle is 98° ± 5° and the receding angle is 56° ± 9°, with a mean of both values of approximately 77°. The surface is thus not hydrophobic, shows a substantial contact angle hysteresis and therefore, allows the development of pinned drops of a substantial size. The key factor for the water conduction is the presence of grooves within the leaf surface that run parallel to the long axis of the plant. These grooves provide a guided downslide of drops that have exceeded the maximum size for attachment. It also leads to a minimum of inefficient drop scattering around the plant. The combination of these surface traits together with the tall and upright stature of S. sabulicola contributes to a highly efficient natural fog-collecting system that enables this species to thrive in a hyperarid environment.

scholarly journals Transient analysis of advancing contact angle measurements on polished rock surfaces

2018 ◽  
Vol 119 ◽  
pp. 142-149 ◽  
Author(s):  
C.H. Gates ◽  
E. Perfect ◽  
B.S. Lokitz ◽  
J.W. Brabazon ◽  
L.D. McKay ◽  
...  
Keyword(s):  
Contact Angle ◽  
Transient Analysis ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Advancing Contact Angle

Design of Experiment: A Statistical Approach to Understanding Factors Influencing Surface Properties of Sol-Gel Based Non-Stick Ceramic Coatings

2012 ◽  
Vol 622-623 ◽  
pp. 420-425
Author(s):  
Alex Kwasi Kumi ◽  
Allan Chelashaw ◽  
Yu Mei Zhang ◽  
Li Feng Li
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Curing Temperature ◽  
Factors Influencing ◽  
Silane Coupling ◽  
Advancing Contact Angle

Ceramic coatings based on sol-gel method have increasingly gained much attention in recent times. In order to ascertain important experimental factors (variables) influencing surface properties, such as adhesion, pencil hardness and advancing contact angle (non-stick) of sol coatings, a 26-1-factorial screening design with six experimental variables, precursor mole ratio, low surface energy polymer concentration, silane coupling agent (SCA) concentration, silica nanoparticles concentration (SNP’s),curing temperature and three responses ( surface properties) were investigated. The results indicate that silane coupling agent concentration, SNP’s concentration and their interaction were the most significant experimental factors influencing advancing contact angle. None of the experimental factors studied were statistically significant with respect to hardness and adhesion.

Sign in / Sign up

Export Citation Format

Share Document