Hong zhao characterization, contact angle, and fundamentals. Contact angle measurement an overview sciencedirect topics. Journal of materials chemistry a royal society of chemistry. This technique is able to electrospin various materials including biodegradable, nondegradable and natural materials 7.
Pdf contact angle wettability and adhesion researchgate. Students observe how different surfaces are used to maintain visibility under different conditions. The present invention relates to a surface tension modifier for use in liquid curable composite materials, wherein the modifier is the reaction product between a polyol and an organofunctional silane. The contact angle is defined as the angle between the tangent to liquidfluid interface and the tangent to solid surface at the contact line between three phases. Relationships between water wettability and ice adhesion. Capillarydriven flow, contact angle hysteresis and pulsed pumping were demonstrated in these plastic devices. Astm d5725992008, standard test method for surface wettability and absorbency of sheeted materials using an automated contact angle tester withdrawn 2010, astm international, west conshohocken, pa, 2008, back to top. Dec 01, 2014 the contact angle and adhesion forces between albumin, fxii, and fibrinogen modified tips with the substrate were measured. Oil wettability in the wateroilrock systems is very sensitive to the evolution of surface charges on the rock surfaces induced by the adsorption of ions and other chemical agents in water flooding. This, in turn, has a profound effect on the wettability and adhesion of liquids and coatings to surfaces. Advances in contact angle, wettability and adhesion, volume 1. Theory for the estimation of surface and interfacial energies vi.
Feng,2,3 and chuanhua chen1,b 1department of mechanical engineering and materials science, duke university, durham. Dynamic contact angle a contact angle measured under dynamic flow conditions that is affected by the velocity of the flow due to viscous effects. Properties see more details, wettability wettability subject category. Inkjet printing, line bulging, droplet merging, adhesion, cohesion, silver ink. Contact angle, wettability and adhesion, volume 6 kindle edition by kash l. The porosity and wettability properties of hydrogen ion treated poly tetrafluoroethylene hernando s. Contact angle the surface wettability of the samples was measured by contact angle measurement automatic contact angle meter model sl200b, solon information technology co. This symposium will be concerned with both the fundamental and applied aspects of contact angle measurements. This volume chronicles the proceedings of the 5th international symposium on contact angle, wettability and adhesion toronto, canada, june 2006. Pretreatment is often carried out on samples that are continuously moving. All of the proteins studied exhibited a step increase in adhesion force as the contact angles of the surface increased above. Surface and interface microstructures of coatings systems and. Wettability for the flow passage surface has a direct influence on the air bubbles flowing in the fluid. Protein adhesion forces were found to increase with contact time on all surfaces, consistent with surface.
Shuhui li a, jianying huang a, zhong chen b, guoqiang chen a and yuekun lai ac a national engineering laboratory for modern silk, college of textile and clothing engineering, soochow university, suzhou 215123, china. Nonadhesive and waterrepellent surfaces are required for many tribological applications. Plasma ionizationbased 3d titania nanofiberlike webs to enhance bioreactivity and osteoconductivity of biomaterials 16 december 2019, by thamarasee jeewandara. A surface that is easy to wet is one over which a coating is more likely to give good adhesion and appearance and less likely to suffer surface tension related defects such as crawling, cratering, pinholing and orange peel. The receding contact angle is a measure of the remaining interaction forces between the liquid and the solid. The modification of the surface was accomplished using uv light, and the contact angle was reduced from 88 to 45. Adhesion is a attraction process between dissimilar surfaces that cling to one another and cohesion takes place between similar molecules.
The contact angle that is formed during shrinking of the droplet is referred to as receding contact angle. Adhesion and cohesion are terms that are often confused although these subjects are discussed in many standard texts in dental biomaterials science. There are also many excellent texts and monographs on adhesion, cohesion, and interfacial reactions 46 together with a comprehensive treatment in the online encyclopedia, wikipedia. Every value of ca and sliding angle sa was obtained by measuring five different positions. Xinjie liu,ab yongmin liang,a feng zhoua and weimin liua received 20th october 2011, accepted 3rd november 2011 doi. This type of treatment is easy to implement and could be beneficial for liq. Effects of surface wettability and contact time on protein. Advances in contact angle, wettability and adhesion, volume 3. Interface, surface, coatings, nanoscale, afm 1 introduction the surface and interface properties have a strong influence on the service life and adhesion of coatings applied to plastics and metals. The model stems from a conclusion that the young equation, i and the contact angle contact line hence their surface properties have to relax to new equilibrium values giving rise to the surface.
Pdf investigation of rock wettability alteration by. Theoretically, the more exact relation between contact angle and work of adhesion is more involved and is given by the youngdupre equation. A given system of solid, liquid, and vapor at a given temperature and pressure has a unique equilibrium contact angle. This book is the second volume in the series contact angle, wettability and adhesion. The contact angle ca and radius of the contact area are valuable for analyzing the wettability of droplets at the nondetachment state. Contact angle, wettability and adhesion, volume 6 crc press book the topic of wettability measured in terms of contact angle is of tremendous interest from both fundamental and applied points of view, wettability plays an essential role in many industrial processes, so an understanding of factors dictating wettability and how to modulate it. He is the editor of more than 110 books dealing with adhesion. Contact angle definition and examples of contact angle. It was observed that higher polymer surface roughness enhanced cell adhesion, but had a negative effect on cell spreading. As represented by equation 2, the contact angle 540 is a function of the applied voltage. Contact angle, wettability and adhesion stevens institute of technology, hoboken, new jersey, july 15, 2016 symposium history and motiviation in his opening remarks at the first symposium in this series professor robert good pointed out that galileo in the 17th century was quite likely the first investigator to observe contact.
Contact angle, wettability, and adhesion volume 43 by gould, r f ed and a great selection of related books, art and collectibles available now at. Investigation of rock wettability alteration by carbonated water contact angle measurement. Influence of surface roughness on contact angle and. The potential of combining chemistry, roughness, and rough ness geometry. Adhesion of anionic surfactants to polymer surfaces and lowenergy materials cj. Pdf advances in contact angle, wettability and adhesion, volume.
The present invention further relates to a method of improving wettability of a resin and use of the surface tension modifier of the invention. Kashmiri lal mittal was employed by the ibm corporation from 1972 through 1993. Wetting refers to the study of how a liquid deposited on a solid or liquid substrate spreads out. Thus, it cannot characterise the equilibrium wettability. May 19, 2019 in addition, the patterned surface displays anisotropic wettability that resulted from the wettability difference between the yellow and black parts. This is due to their excellent properties, such as intelligence, microminiaturization, hierarchical assembly, and adaptability. Controlled droplet transport to target on a high adhesion. Review of surfactantassisted chemical enhanced oil recovery. In a vacuum system with degassed metals and glass, the equilibrium contact angle was zero, and did not change with time. Wettability affects ink receptivity, coating, absorbency, adhesion, and frictional properties. One obtains the adhesion work or surface energy through the following formula. The deviation of the dynamic contact angle from the equilibrium contact angles depends on the capillary number. Influence of surface roughness on contact angle and wettability both chemical and topographical properties of the surface are important parameters in many different applications and processes, where wetting and adhesion behavior needs to be optimized. Standard practice for surface wettability of coatings.
Until now the inline control of such dynamic processes was not possible for the. Therefore, the contact angle can be used to quantitatively describe the wettability of a certain solid by a liquid in a particular system. Contact angle definition, examples and mesure of contact angle. Dynamic contact angle on a surface with gradient in. Effect of surface wettability and topography on the. Properties see more details held in providence, rhode island, during 2023. When the surface was tilted to only 5, the water droplet could roll down easily inset of figure2d. Notably, studies of ultrasmall droplets on solid surfaces allow wetting theories to be. Characterization of silver inkjet overlapprinting through. Effects of surface wettability and contact time on protein adhesion to biomaterial surfaces. Contact angles and wettability of cellulosic surfaces. Advances in contact angle, wettability and adhesion, volume 2. Generally, cases where the contact angle is low are considered of higher adhesion per unit area.
The topic of wettability measured in terms of contact angle is of tremendous interest from both fundamental and applied points of view, wettability plays an essential role in many industrial processes, so an understanding of factors dictating wettability and how to modulate it is of paramount importance. Even a cursory glance at the literature show that in recent years the interest in understanding and controlling wetting behavior has grown exponentially. Considerable interest has arisen in fabricating surfaces with various types of biomimetic structures. Here, we use simple method to introduce three driving forces on a high adhesion surface, i.
C water droplets one, two, and three merge together to form one big droplet. A small contact angle indicates more adhesion is present. Contact angle hysteresis advances in chemistry acs. It should be underscored that in the last years there has been burgeoning interest in replicating the so. Currently, there is tremendous research activity in rendering surfaces superhydrophobic, superhydrophilic. Capillaryinertial colloidal catapults upon drop coalescence roger l. Inline process control of wettability by means of contact. The effect of surface wettability on the performance of a. Pdf heterogeneous nucleation of a new bulk phase on a flat substrate can be associated with the surface phase transition called wetting transition find.
Materials that can wet each other tend to have a better adhesion, and the wettability of the material is. Wettability can be studied by measuring the contact angle of the substrate with the given liquid. Students are presented with the concepts of wetting and contact angle. In this paper, the theory of roughnessinduced superhydrophobicity is presented. They are also introduced to the distinction between hydrophobic and hydrophilic surfaces.
Properties see more details and adhesion adhesion subject category. Reversible switch between underwater superaerophilicity and. Surface wettability is of importance for electrochemical reactions. Wettability of contact lenses contact angle measurements for ensuring quality and the development of biocompatible materials.
In contrast, if the affinity of a nanofluid ink to the solid substrate is weak, the printed nanofluid droplets pull themselves together and create drop features with lower wetting and higher contact angle. Contact angle, wettability and adhesion, volume 6 crc. The porosity and wettability properties of hydrogen ion treated polytetrafluoroethylene hernando s. To improve the dragreducing and antifouling performance of marine equipment, it is indispensable to learn from structures and materials that are found in nature. With regards to adhesives, the series will include, but not limited to, green adhesives. Directing motion of droplets using differential wetting. Dynamic contact angle on surface with gradient in wettability 1xiaofei wang, longfei wang1,2, rong yu1. In this work we examine the relationships between water wettability and ice adhesion strength on nominally smooth bare and coated steel discs. Wettability and coalescence of cu droplets subjected to two. Currently, he is teaching and consulting worldwide in the broad areas of adhesion as well as surface cleaning.
Advances in contact angle, wettability and adhesion. Nebulized jetbased printing of bioelectrical scaffolds for. Salapare iii and others published contact angle wettability and adhesion find, read and cite all the research you. We use moderately hydrophilic materials, such as epoxybased su8 and dryfilm resist dfr 80 and 70 advancing contact angles with water, respectively, for the side and top channel walls and pattern the egate trench with a sharp edge 90 angle on a more hydrophilic bottom layer, sio 2, because this configuration gives a good. Controlled droplet transport to target on a high adhesion surface with multigradients. This book documents the proceedings of the third international symposium on contact angle contact angle subject category. The tests were conducted in room temperature and repeated four times. Zhang, yilei, the effect of surface roughness parameters on contact and wettability of solid surfaces 2007. This volume documents the proceedings of the second international symposium on contact angle, wettability and adhesion held in newark, nj, june 2123, 2000. Standard test method for surface wettability of paper angle ofcontact method1 this standard is issued under the. Since primary and secondary recovery methods fail to yield above 20%40% of original oil in place from these reserves, the need for enhanced oil recovery eor techniques for incremental oil recovery has become imperative. As roughness goes handinhand with an enlarged surface area, it affects the wettability of a solid, the contact angle ca of a liquid, and the adhesion. Contact angle, wettability and adhesion, volume 6 1, kash.
Techniques for determining contact angle and wettability. Oil contact angles in a waterdecanesilicon dioxide system. Surface energies of some flurocarbon surfaces from contact angle measurements. The effect of surface roughness parameters on contact and wettability of solid surfaces yilei zhang. Wettability is often referred as the contact angle of liquid droplet as the measure of characteristics for hydrophilic or hydrophobic. Use features like bookmarks, note taking and highlighting while reading contact angle, wettability and adhesion, volume 6. Surface wettability and absorbency of sheeted materials using an automated contact angle tester 1. Through a set of largescale molecular dynamics simulations, we reveal the effects of surface charge on the oil contact angles in an ideal waterdecanesilicon dioxide system. The theoretically predicted minimum in the curve of receding contact angle vs. From these results, it can be concluded that the treated part remains aerophilic for better bubble. However, in practice a dynamic phenomenon of contact angle. Standard test method for surface wettability of paper. This approach assumes that the lower contact angle corresponds to a higher surface energy. An experimental study is presented on contact angle dynamics during spreadingrecoiling of mmsized water droplets.
The theoretical wettability behavior of an idealized, rough surface agrees well with that of real surfaces. Contact angle methods are widely used to evaluate the wettability of cellulosebased surfaces and to judge their suitability for different applications. Wettability is of pivotal importance in many and varied arenas, ranging from mundane to microand nanofluidics to lithography to biomedical. Us20100120968a1 wetting and surface tension reducing agent.
Adhesion and adhesives theory presented by shrikant athavale for pg students, sies nerul on 09102010 2. A number in parentheses indicates the year of last reapproval. Vafaei, saeid and tuck, christopher and ashcroft, ian and. Contact angle dynamics in droplets impacting on flat. Fowkes f ed contact angle, wettability, and adhesion, advances in chemistry. Zisman, in contact angle, wettability and adhesion.
Herein, its role in electrochemical hydrogen evolution reactions is investigated using lightsensitive nanotubular tio2. The porosity and wettability properties of hydrogen ion treated polytetrafluoroethylene ptfe materials are related using contact angle, scanning electron. It quantifies the wettability of a solid surface by a liquid via the young equation. Timedependent contact angle of a catalyst layer with wetting process a 0 s, i. Plasma ionizationbased 3d titania nanofiberlike webs to. Dynamic contact angle on a surface with gradient in wettability xiaofei wang. He has received numerous awards and honors including the title of doctor honoris causa from maria curiesklodowska university, lublin, poland. Measuring advancing and receding contact angle with the tilting stage assmebly tilting stage control interface vca optima software calculates asymmetrical drop image with accuracy. Dynamic contact angles, wettability and capillary suction. Cell adhesion studies were carried out using human mg63 osteosarcoma cells. Since that time contact angle measurements have found wide application as a method for determining the energetics of surfaces. Control of the wetting properties of an aisi 316l stainless steel surface by femtosecond laserinduced surface modification.
Contact angle, wettability and adhesion held under the aegis of mst confer ences in. In the last years there has been an explosive interest in superhydrophobic surfaces i. Mittal, advances in contact angle, wettability and adhesion, volume 3 english isbn. The effect of surface roughness parameters on contact and. The wettabilities of inair water droplet and underwater bubble were investigated by a jc2000d contactangle system powereach, china. Dynamic contact angles, wettability and capillary suction of hydrophobic porous materials 193 despite the success in offering insight into the wettability and spreading phenomena, youngs equation has been subject of considerable controversy and discussion. Contact angles on glass were obtained from capillary rise measurements and from xray observations of menisci in tubes, for the interface between liquid gallium and mercury at 25c. Electroactuated valves and selfvented channels enable. Analysis and surface energy estimation of various model polymeric surfaces using contact angle hysteresis.
In this paper, we studied the effect of surface wettability on the bubble tolerance of a piezoelectric membrane pump, by applying the superhydrophilic or superhydrophobic surface to the key elements on the pump. Rapid prototyping of an opensurface microfluidic platform. Theyoungequationassumesthatthe surface is totally smooth and the static contact angle is deter. A significant fraction of the conventional oil reserves globally is in carbonate formations which contain a substantial amount of residual oil. One of the requirements, but not enough to produce the phenomenon of adhesion between two materials is that the materials wet to each other, the adhesive needs to have a good wettability on the substrate. It was found during surface wettability experiments. Capillaryinertial colloidal catapults upon drop coalescence. The contact angle is the angle, conventionally measured through the liquid, where a liquidvapor interface meets a solid surface. Constraints on the adhesion of viscous threads spun by orb. Since the first symposium, held in 1992, there had been tremendous research activity on many ramifications of. The difference between the advancing and receding contact angle is referred to as contact angle hysteresis. Its predecessor volumes 1 and 2 were published in 20 and 2015, respectively. Roughnessinduced superhydrophobicity has been suggested as a way to reduce adhesion and stiction. This is the third volume in the series advances in contact angle, wettability and adhesion initiated to consolidate information and provide commentary on certain recent research aspects dealing with this important topic.
Costanzo 879 the influence of contact angle, wettability, and reactivity on the development of indirectbonded metallization for aluminum nitride m. Norton 891 influence of alloying elements on wettability and adhesion energy in liquid. Control of wettability with surface texturing and its application nobuyuki moronuki, kentaro ryu and arata kaneko. Download it once and read it on your kindle device, pc, phones or tablets. Aug 29, 2019 the contact angle change may in turn cause the droplet 110 to change shape, to move, to split into smaller droplets, or to merge with another droplet. A similar step change in protein adhesion force with wettability was observed in a previous study. Surface wettability and absorbency of sheeted materials. Pdf contact angle, wettability, and adhesion, volume 6. Contact angle, wettability and adhesion, volume 2 crc. Itsmain advantage is the ability to produce nonwoven polymer mats consisting of nano. The wettability of a threephase system solid, liquid, fluid is characterized by the contact angle. Soft contact lenses do not lie directly on the cornea but float on a. Such low water sliding angle wsa of 5 indicates that the laserinduced rough surface showed superhydrophobicity and ultralow adhesion to a water droplet. As wetting is reflected directly by the contact angle, measuring the contact angle is an excellent way of testing the efficacy of such pretreatment methods 1.
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