
	Where results make sense

Topic: Contact angle

Related Topics

first contact

Contact movie

Pre Columbian trans oceanic contact

contact improvisation

eye contact

body contacts

body contact dance

contact print

contact centres

electrical contacts

contact binaries

In the News (Mon 13 Feb 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	UWEB :: Research : Biomaterials Tutorial
		Contact angle analysis characterizes the wettability of a surface by measuring the surface tension of a solvent droplet at its interface with a homogenous surface.
		Contact angle is one of the most sensitive and inexpensive surface analysis techniques and is capable of measuring ~3-20 Å deep.
		In all the methods, the contact angle (q) is the angle of the liquid at the interface relative to the plane of the model surface.
	www.uweb.engr.washington.edu /research/tutorials/contact.html (624 words)

	Contact angle - Wikipedia, the free encyclopedia
		The contact angle is the angle at which a liquid/vapor interface meets the solid surface.
		Angle between the baseline of the drop and the tangent at the drop boundary is measured.
		The theoretical description of contact arises from the consideration of a thermodynamic equilibrium between the three phases: the liquid phase of the droplet (L), the solid phase of the substrate (S), and the gas/vapor phase of the ambient (V) (which will be a mixture of ambient atmosphere and an equilibrium concentration of the liquid vapor).
	en.wikipedia.org /wiki/Contact_angle (576 words)

	Wetting - Wikipedia, the free encyclopedia
		The primary measurement to determine wettability is a contact angle measurement.
		This measures the angle between the surface and the surface of a liquid droplet on the surface.
		A contact angle of 90° or greater generally characterizes a surface as not-wettable, and one less than 90° means that the surface is wettable.
	en.wikipedia.org /wiki/Wetting (410 words)

	Contact Angle Measurement (Site not responding. Last check: 2007-10-29)
		The angle formed at contact between the hydrated sample surface and air bubble (Figure 2) is calculated from the bubble’s height and diameter at the interface, and is reported as contact angle in degrees: the greater the contact angle, the greater the hydrophobicity of the polymer surface.
		Contact angle is derived algorithmically from the height/diameter ratio and is inversely related.
		Contact angle, as a measure of hydrophobicity, may be correlated statistically with other measurements of membrane surface properties, such as microbial adsorption data.
	www.micromemanalytical.com /CAngle/ConAngl.htm (608 words)

	How Does a Liquid Wet a Solid? Hydrodynamics of Dynamic Contact Angles
		The contact angle, the angle formed at the intersection of the solid and the fluid-fluid interfaces, is a key material property needed to determine the shape of the fluid-fluid interface.
		This suggests that, in contrast to the static contact angle (see the first graph, preceding page), the dynamic contact angle is not a well-defined quantityit is not at all clear where on the interface one should apply the slope condition in order to calculate the interface shape.
		Nevertheless, a dynamic contact angle is still necessary to calculate the interface shape in dynamic conditions, the pressure drop necessary to move a meniscus in a capillary tube, and the spreading dynamics of small droplets.
	www.grc.nasa.gov /WWW/RT2000/6000/6712rame.html (1245 words)

	ramé-hart Contact Angle Goniometers (Site not responding. Last check: 2007-10-29)
		Contact angle describes the shape of a liquid droplet resting on a solid surface.
		The angle of contact is the angle between the tangent to the periphery of the point of contact with the solid.
		Contact angle measuring unit for characterization of hydrophobicity of film surfaces are used in controlling cleaning processes.
	www.ramehart.com /goniometers (425 words)

	Gardco - Pocket Goniometer
		Contact angle measurement is a reliable method to characterize the interaction between a liquid and a surface.
		The wetting hysteresis of a surface is characterized by the advancing/receding contact angles describing the wetting/de-wetting properties at a surface.
		The contact angle is a function at the liquid's surface tension and the surface "free" energy at the substrate.
	www.gardco.com /pages/surface_tension/goniometer.html (1222 words)

	Contact Angle Measurement Techniques for Determination of Wettability (Site not responding. Last check: 2007-10-29)
		However, if the contact angle is measured under the conditions that the liquid drop is stationary and the surrounding conditions are at the steady state, the measured contact angle is called the static/equilibrium contact angle.
		The interest in contact angle is twofold: it is a manifestation of the surface tension of the solid on which the contact angle is formed, and it also plays a major role in a number of technological, environmental, and biological phenomena and processes.
		Thus, the contact angle is determined by aligning a tangent with the drop profile at the point of the three-phase contact circle on the solid surface.
	www.dekker.com /sdek/6706933-52152405/abstract~db=enc~content=a713562197~words= (1424 words)

	Contact angle measurements (Site not responding. Last check: 2007-10-29)
		Contact angles of liquids on polymer surfaces are widely used to predict wetting and adhesion properties of these solids by calculating their solid-vapour surface tension.
		Contact angles on polymer surfaces are not only influenced by the interfacial tensions according to Young´s equation but also by many other phenomena, such as surface roughness, chemical heterogeneity, sorption layers, molecular orientation, swelling, and partial solution of the polymer or low-molecular constituents in the polymer material.
		As in the case of sessile liquid droplets, the contact angle of the captive bubble is normally measured by the conventional goniometer technique.
	www.ipfdd.de /research/res12/adsa_p.html (970 words)

	KSVLTD - Contact Angle
		Contact angle is a quantitative measure of the wetting of a solid by a liquid.
		It is the angle formed by the liquid at the three phase boundary where a liquid, gas (or a second immiscible liquid) and solid intersect.
		The contact angle is determined by drawing a tangent at the contact where the liquid and the solid intersect.
	www.ksvltd.com /content/index/keyca (257 words)

	Contact_Angle
		Contact angle can be assessed directly by measuring the angle formed between the solid and the tangent to the drop surface.
		This contact angle, which is obtained from data generated as the probe advances into the liquid, is the advancing contact angle.
		Variations of contact angles, both advancing and receding, for the entire length of the sample tested are visualized on the same graph.
	www.ksvinc.com /contact_angle.htm (2349 words)

	An Analysis of Contact Angle Measurement (Site not responding. Last check: 2007-10-29)
		Contact angle measurement (CA) is a simple-to-adopt method for surface analysis related to surface energy and tension.
		Contact angle describes the shape of a liquid droplet resting on a solid surface.
		When drawing a tangent line from the droplet to the touch of the solid surface, the contact angle is the angle between the tangent line and the solid surface.
	www.p2pays.org /ref/13/12920.htm (503 words)

	Precision Engineering - Radial & Axial Play, Raceway Curvature and Contact Angle
		Contact angle is the angle between a plane perpendicular to the ball bearing axis and a line joining the two points where the ball makes contact with the inner and outer raceways.
		The initial contact angle of the bearing is directly related to radial play—the higher the radial play, the higher the contact angle.
		The contact angle is given for the mean radial play of the range shown i.e., for P25 (.0002 to.0005)—contact angle is given for.00035.
	www.nhbb.com /engineering/precision/radial-axial.cfm (617 words)

	Wetting Tension and Contact Angle
		Contact angle is a measurement of the behavior of pure water in contact with the film surface.
		This is quantified by measuring the contact angle of the droplet with the surface.
		Unlike the ASTM contact angle test that applies a single water droplet, our Cahn test immerses a prepared film sample into a beaker of distilled water at a constant rate of speed, while a sensitive balance records the wetting force.
	www.polyprint.com /faq_wettingtension.htm (1607 words)

	Journal of Electronic Materials: Contact Angle Measurements of Sn-Ag and Sn-Cu Lead-Free Solders on Copper Substrates
		Contact angles ranging from 30° to 40° after wetting under vacuum with no fluxes and between 10° and 30° with rosin mildly activated (RMA) and rosin activated (RA) fluxes were obtained.
		The effect of temperature on contact angle was dependent on the type of flux used.
		With the advent of the new lead-free solder alloys, there is a renewed interest to evaluate the contact angles of the proposed alloys as a measure of their wettability.
	www.findarticles.com /p/articles/mi_qa3776/is_200412/ai_n9473484 (356 words)

	Contact Angle
		This plug-in calculates the contact angle of a drop on a flat surface using the sphere approximation (theta=2atan(2h/l) and the ellipse approximation.
		In fact people often perform contact angle measurements, by applying the sphere approximation, neglecting in this way the gravity effect, or by calculating the tangent of the profile without limit the drop volume.
		In fact if the shape depends significantly on the gravity force, the resulting angle is not a value of contact angle as defined in Theory, but just an angle depending on the gravity.
	rsb.info.nih.gov /ij/plugins/contact-angle.html (768 words)

	Hysteresis in Contact Angle Measurements (Site not responding. Last check: 2007-10-29)
		Contact angles provide a simple and inexpensive method for examining the wetting of solid surfaces.
		It was recognized early on that surface imperfections, such as contamination, could lead to contact angle hysteresis and that removing such anomalies greatly reduced it ((2), (3)).
		Contact angle hysteresis should be considered a rich source of information on the behavior of liquid-solid interfaces rather than a problem, as it sometimes has been portrayed (4).
	www.dekker.com /sdek/13112202-54699231/abstract~content=a713562111~db=enc (576 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		System Description The Kruss Contact Angle Measuring System is used to deter- mine surface properties of solids and liquids using the ses- sile and pendant drop methods, respectively.
		The sessile drop method is an optical contact angle technique used to estimate wetting properties of a localized region on a solid surface.
		The contact angle can also be taken by pressing the icon that shows a drop on a surface with an angle measured.
	argon.eecs.berkeley.edu /manual/chap8.24 (686 words)

	Modeling Subsurface Transport of Petroleum Hydrocarbons--The Contact Angle and Wetting, US EPA
		The contact angle is used to characterize wetting behavior and is idealized because the measurement is made on an extremely smooth flat plate.
		The contact angle is measured through the wetting phase and as illustrated below, a fluid is said to wet the surface if the contact angle is less than 90 degrees.
		If the contact angle is greater than 90 degrees, the fluid is said to be non-wetting.
	www.epa.gov /ATHENS/learn2model/part-one/phases/contactangles.htm (216 words)

	KRÜSS \| Theory Measuring Techniques - Contact Angle Measurement
		A requirement for this is the knowledge of the contact angles of the corresponding liquids during phase contact with the solid surface.
		The equation of state was obtained during the search for a method of determining the surface energy of a solid from a single contact angle measurement by using a liquid with known surface tension.
		For example: The surface energy of a solid is to be determined by using the contact angles of 4 test liquids: water, diiodomethane, ethylene glycol and benzyl alcohol.
	www.kruss.info /techniques/contact_angle_e.html (3221 words)

	NASA Quest > Space Team Online (Site not responding. Last check: 2007-10-29)
		To measure the contact angle of a fluid.
		This angle can be measured by observing the attraction of fluid into sharp corners by surface forces.
		If the angle between the two glass planes is slowly decreased, the fluid the glass is standing in jumps up suddenly when the critical value of the corner angle is reached.
	quest.arc.nasa.gov /space/teachers/mg/12contact-angle.html (383 words)

	Contact Angle Vs. Dynes Testing
		The contact angle which a liquid forms on a smooth, homogeneous surface is dependent on the solid’s surface energy; higher energy surfaces exhibit a smaller contact angle, and offer better wettability.
		Tantec’s contact angle meters use distilled water to test films and flats, as well as curved or cylindrical objects.
		This meter measures contact angles on either film or non-film surfaces, merging the attributes of the film and micro models.
	www.accudynetest.com /contact_angle_meters.html (385 words)

	Cahn Radian DCA Analyzer - Thermo Electron Corporation (Site not responding. Last check: 2007-10-29)
		A unique contact angle hysteresis curve is produced by the microbalance as it measures the force exerted by the moving contact angle in advancing and receding directions.
		The dynamic contact angle is then calculated from the modified Young’s equation (Wilhelmy equation) cos Ø = Force /(surface tension x wetted perimeter).
		Contact angle measurements obtained by Thermo Cahn DCA range from 0° to 180° with a precision of ± 0.001.
	www.noran.com /com/cda/product/detail/1,1055,19220,00.html (327 words)

	Water Potential and Aggregate Size Effects on Contact Angle and Surface Energy -- Goebel et al. 68 (2): 383 -- Soil ...
		Evaluation of the capillary rise measurement for water and n-hexane (1- to 2-mm Al aggregates, ignited); the contact angle of the outer aggregate surface is calculated from the slope of Stage 2; Stages 1 and 3 are not considered.
		The contact angles of aggregates and the corresponding homogenized
		Contact angles of different size fractions as a function of soil water potential; the gravimetric water contents (WC) are given at the upper axes.
	soil.scijournals.org /cgi/content/full/68/2/383 (5766 words)

	BIG>Drop Analysis
		Its new model is based on B-spline snake which in reason of their elasticity unify the aspects of locality of the contact angle to the guidance provided by the global drop contour.
		With this approach, the whole drop shape is used to provide global information, nevertheless, the contact angle measurement remains local and similar to a polynomial fit.
		Using this global model of a drop, contact angles are obtained considering the whole drop profile.
	bigwww.epfl.ch /demo/dropanalysis (479 words)

Try your search on: Qwika (all wikis)