scholarly journals EFFECT OF CHITOSAN FILM SURFACE STRUCTURE ON THE CONTACT ANGLE

2021 ◽  
Vol 26 ◽  
pp. 89-100
Author(s):  
Sylwia Jagodzińska ◽  
◽  
Beata Pałys ◽  
Dariusz Wawro ◽  
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Chitosan Film ◽  
Film Surface ◽  
European Pharmacopoeia ◽  
Cellulose Films ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Chitosan Films ◽  
The Difference

The aim of this study was to evaluate the influence of the surface microstructure of chitosan films on the contact angle. Films without plasticising additives made of chitosan or regenerated chitosan were selected for the tests. A sessile drop method based on the European Pharmacopoeia was used to determine the contact angle. Due to the method of film production, the contact angle measurements were made on both the top and bottom surfaces of the film. For chitosan or regenerated chitosan films, the method of preparation slightly affected the difference in wettability between the top and bottom of the films, as confirmed by scanning electron microscopy. On the other hand, the wettability of the top and bottom of cellulose films varied greatly depending on the side of the film. Both chitosan and cellulose films had a homogeneous structure. There were differences in the microstructure between the top and the bottom of the sample in the cellulose film, a factor that affected the contact angle and thus the wettability of the surface.

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 The Leaf Wettability of Various Potato Cultivars

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 504
Author(s):  
Ewa Papierowska ◽  
Jan Szatyłowicz ◽  
Stanisław Samborski ◽  
Joanna Szewińska ◽  
Elżbieta Różańska
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Leaf Surface ◽  
Solanum Tuberosum L ◽  
Fungal Disease ◽  
Potato Cultivars ◽  
Potato Leaf ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Leaf Wettability

Leaf wettability has an impact on a plant’s ability to retain water on its leaf surface, which in turn has many environmental consequences. In the case of the potato leaf (Solanum tuberosum L.), water on the leaf surface may contribute to the development of a fungal disease. If fungal disease is caused, this may reduce the size of potato harvests, which contribute significantly to meeting global food demand. The aim of this study was to assess the leaf wettability of five potato cultivars (i.e., Bryza, Lady Claire, Rudawa, Russet Burbank, Sweet Caroline) in the context of its direct and indirect impact on potato yield. Leaf wettability was assessed on the basis of contact angle measurements using a sessile drop method with an optical goniometer. For Bryza and Rudawa cultivars, which showed, respectively, the highest and the lowest contact angle values, light microscopy as well as scanning electron microscopy analyses were performed. The results of the contact angle measurements and microscopic image analyses of the potato leaf surfaces indicated that the level of wettability was closely related to the type of trichomes on the leaf and their density. Therefore, higher resistance of the Rudawa cultivar to biotic stress conditions could be the result of the presence of two glandular trichome types (VI and VII), which produce and secrete metabolites containing various sticky and/or toxic chemicals that may poison or repel herbivores.

scholarly journals Contact Angle Measurements Using Sessile Drop and Micro-CT Data from Six Sandstones

2020 ◽  
Vol 133 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Laura E. Dalton ◽  
Deepak Tapriyal ◽  
Dustin Crandall ◽  
Angela Goodman ◽  
Fan Shi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Micro Ct ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ct Data

scholarly journals Surface Free Energy Utilization to Evaluate Wettability of Hydrocolloid Suspension on Different Vegetable Epicarps

Coatings ◽  
2017 ◽  
Vol 8 (1) ◽  
pp. 16 ◽  
Author(s):  
Fernando Osorio ◽  
Gonzalo Valdés ◽  
Olivier Skurtys ◽  
Ricardo Andrade ◽  
Ricardo Villalobos-Carvajal ◽  
...  
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Hydroxypropyl Methylcellulose ◽  
Energy Utilization ◽  
Work Of Adhesion ◽  
Edible Coatings ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
The Difference

Surface free energy is an essential physicochemical property of a solid and it greatly influences the interactions between vegetable epicarps and coating suspensions. Wettability is the property of a solid surface to reduce the surface tension of a liquid in contact with it such that it spreads over the surface and wets it, resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by an energy balance between adhesive and cohesive work. The spreading coefficient (Scf/food) is the difference between the work of adhesion and the work of cohesion. Surface wettability is measured by the contact angle, which is formed when a droplet of a liquid is placed on a surface. The objective of this work was to determine the effect of hydroxypropyl methylcellulose (HPMC), κ-carrageenan, glycerol, and cellulose nanofiber (CNF) concentrations on the wettability of edible coatings on banana and eggplant epicarps. Coating suspension wettability on both epicarps were evaluated by contact angle measurements. For the (Scf/food) values obtained, it can be concluded that the surfaces were partially wet by the suspensions. Scf/food on banana surface was influenced mainly by κ-carrageenan concentration, HPMC-glycerol, κ-carrageenan-CNF, and glycerol-CNF interactions. Thus, increasing κ-carrageenan concentrations within the working range led to a 17.7% decrease in Scf/banana values. Furthermore, a HPMC concentration of 3 g/100 g produced a 10.4% increase of the Scf/banana values. Finally, Scf/fruit values for banana epicarps were higher (~10%) than those obtained for eggplant epicarp, indicating that suspensions wetted more the banana than the eggplant surface.

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