contact angle wetting and adhesion a critical review pdf

Contact Angle Wetting And Adhesion A Critical Review Pdf

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Published: 04.05.2021

Performed the experiments: NJS. Analyzed the data: NJS.

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It is not unusual for humans to be inspired by natural phenomena to develop new advanced materials; such materials are called bio-inspired materials. Interest in bio-inspired polymeric superhydrophilic, superhydrophobic, and superoleophobic materials has substantially increased over the last few decades, as has improvement in the related technologies. This review reports the latest developments in bio-inspired polymeric structures with desired wettability that have occurred by mimicking the structures of lotus leaf, rose petals, and the wings and shells of various creatures. The intrinsic role of surface chemistry and structure on delivering superhydrophilicity, superhydrophobicity, and superoleophobicity has been extensively explored.

Surface-wetting characterization using contact-angle measurements

Chicago, Illinois, USA. November 5—10, A recent surface energy estimation method [1] interpreting contact angle hysteresis measurements was used to estimate surface energy of various commercially important polymer films including UV radiation cross-linked acrylic based monomer systems.

The validity of the method was tested on highly hydrophobic non-polar amorphous fluoro-polymers using a number of polar and low surface tension liquids. Contact angle hysteresis was present on these surfaces even though surface morphology of the solution processed fluoro-polymers is close to ideal.

Estimated surface energies using such probe liquids were consistent varying slightly with the probe liquid type. On such highly ordered and non-polar polymer surfaces use of polar and low surface tension liquids results in accurate surface energy estimation.

However, use of polar probe liquids commonly employed in surface energy estimation methods, such as, Harmonic mean HM , Geometric mean GM or Lewis Acid-Base method LWAB on polar surfaces such as polyester resulted in inconsistent surface energy values. To strengthen this observation, the ASTM surface energy estimation procedure ASTM D 04a developed for polyethylene and polypropylene surfaces both non-polar was employed on a sample polar polyester surface using the ASTM probe liquids.

Results showed inconsistent surface energy values supporting the conclusion that care must be exercised during use of polar probe liquids in estimating surface energy on polar polymers with the contact angle hysteresis method.

Finally, UV radiation cross-linkable acrylic polymer surface energies were estimated with the hysteresis method. Surface energy results were consistent based on five different probe liquids. It was observed that surface energy of the cross-linked monomer networks decreased slightly with increasing UV curing time.

Sign In or Create an Account. Sign In. Advanced Search. Skip Nav Destination Proceeding Navigation. Close mobile search navigation. Previous Paper Next Paper. Article Navigation. Bayer , I. This Site. Google Scholar. Megaridis , C. Zhang , J. Gamota D. Author Information. University of Illinois at Chicago. Published Online: December 14, Volume Subject Area:. Relation of the equilibrium contact angle to liquid and solid constitution.

Study of the advancing and receding contact angles: liquid sorption as a cause of contact angle hysteresis. Griffin, M. Wu, S. Polymer Interface and Adhesion. Dekker, New York. Standard test method for wetting tension of polyethylene and polypropylene films. Shafrin, E. In Polymer Handbook, J.

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Surface Wetting

Chicago, Illinois, USA. November 5—10, A recent surface energy estimation method [1] interpreting contact angle hysteresis measurements was used to estimate surface energy of various commercially important polymer films including UV radiation cross-linked acrylic based monomer systems. The validity of the method was tested on highly hydrophobic non-polar amorphous fluoro-polymers using a number of polar and low surface tension liquids. Contact angle hysteresis was present on these surfaces even though surface morphology of the solution processed fluoro-polymers is close to ideal. Estimated surface energies using such probe liquids were consistent varying slightly with the probe liquid type. On such highly ordered and non-polar polymer surfaces use of polar and low surface tension liquids results in accurate surface energy estimation.


PDF | The wetting behavior of liquid polymers at solid surfaces and the adhesion Critical review of wetting and adhesion phenomena in the preparation of A novel method for contact angle measurements on natural fibers.


The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity

Surface wettability and roughness of 11 Amazonian tropical hardwoods. The purpose of this study was to evaluate the wettability and surface roughness of 11 Amazonian hardwoods. Surface roughness was evaluated by a profilometer, while wettability was measured by a goniometer. Distillated water and phenol-formaldehyde were employed to study wood wettability.

Wet Adhesion and Adhesive Locomotion of Snails on Anti-Adhesive Non-Wetting Surfaces

Contact angle methods are widely used to evaluate the wettability of cellulose-based surfaces and to judge their suitability for different applications. Wettability affects ink receptivity, coating, absorbency, adhesion, and frictional properties. However, due in part to the rough, porous, and water-swellable nature of cellulosic materials, poor fits between various theories and contact angle data have been observed.

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Это касалось и права людей хранить личные секреты, а ведь АНБ следит за всеми и каждым. Уничтожение банка данных АНБ - акт агрессии, на которую, была уверена Сьюзан, Танкадо никогда бы не пошел. Вой сирены вернул ее к действительности. Она смотрела на обмякшее тело коммандера и знала, о чем он думает. Рухнул не только его план пристроить черный ход к Цифровой крепости. В результате его легкомыслия АНБ оказалось на пороге крупнейшего в истории краха, краха в сфере национальной безопасности Соединенных Штатов.

Проституция в Испании запрещена, а сеньор Ролдан был человеком осторожным. Он уже не один раз обжигался, когда полицейские чиновники выдавали себя за похотливых туристов. Я хотел бы с ней покувыркаться. Ролдан сразу решил, что это подстава. Если он скажет да, его подвергнут большому штрафу, да к тому же заставят предоставить одну из лучших сопровождающих полицейскому комиссару на весь уик-энд за здорово живешь. Когда Ролдан заговорил, голос его звучал уже не так любезно, как прежде: - Сэр, это Агентство услуг сопровождения Белен. Могу я поинтересоваться, кто со мной говорит.

 Пойдемте, - позвал Бринкерхофф, помогая Сьюзан вылезти. Она шла следом за ним точно в тумане. Коридор, выложенный кафельными плитками, довольно круто спускался вниз, и Сьюзан держалась за перила, стараясь не отставать. Воздух в помещении становился все прохладнее. Чем глубже под землю уходил коридор, тем уже он становился. Откуда-то сзади до них долетело эхо чьих-то громких, решительных шагов.

Хейл был необычайно силен.

Протерев глаза, она натянула на плечи одеяло и прочла: Моя драгоценная Сьюзан. Я люблю. Без воска, Дэвид. Она просияла и прижала записку к груди.

Стратмор кивнул: - Танкадо хотел от него избавиться. Он подумал, что это мы его убили. Он почувствовал, что умирает, и вполне логично предположил, что это наших рук .

4 comments

Bouytercafi

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REPLY

Mike W.

The theory of the contact angle of pure liquids on solids, and of the determination of the surface free energy of solids, γs, is reviewed. The basis.

REPLY

Loring L.

The contact angle, as a vital measured parameter of wettability of material surface, has long been in dispute whether it is affected by gravity.

REPLY

Azrael S.

Some recommendations are made with regard to contact angle measurements. A new treatment of hydrophilicity, and of the scale of hydrophobic/hydrophilic.

REPLY

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