WO2000000814A1 - Appareil de mesure d'angle de contact - Google Patents

Appareil de mesure d'angle de contact Download PDF

Info

Publication number
WO2000000814A1
WO2000000814A1 PCT/GB1999/002001 GB9902001W WO0000814A1 WO 2000000814 A1 WO2000000814 A1 WO 2000000814A1 GB 9902001 W GB9902001 W GB 9902001W WO 0000814 A1 WO0000814 A1 WO 0000814A1
Authority
WO
WIPO (PCT)
Prior art keywords
drop
contact angle
measuring apparatus
angle measuring
monocular
Prior art date
Application number
PCT/GB1999/002001
Other languages
English (en)
Inventor
Anthony Maddison
Original Assignee
Anthony Maddison
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anthony Maddison filed Critical Anthony Maddison
Priority to GB0031412A priority Critical patent/GB2354831B/en
Priority to AU45219/99A priority patent/AU4521999A/en
Publication of WO2000000814A1 publication Critical patent/WO2000000814A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0208—Investigating surface tension of liquids by measuring contact angle

Definitions

  • the invention relates to contact angle measuring apparatus and in particular to apparatus for measuring the angle of contact between a drop of liquid and the surface of a specimen.
  • Such apparatus is commonly known as a goniometer.
  • the contact angle is the angle described by the surface under examination and the surface of the drop, at its peripheral edge. This angle is affected by surface energy which determines the extent to which a volume of liquid will spread across the surface: If the surface has low energy, the drop will exhibit a high contact angle; if the surface has high energy, the drop will spread and the contact angle will be small. Low surface energy may be indicative of, for example, surface contamination. Hence, if a surface is under assessment for its suitability to accept, say, an adhesive, identification of a large contact angle provides an indication that the surface may be contaminated.
  • What is required is apparatus that is capable of testing contact angle measurements on infinitely large surfaces without causing damage thereto.
  • the invention provides contact angle measuring apparatus comprising means for directing light at a drop of liquid on the surface of a specimen, means for identifying light reflected from the drop and means enabling the identifying means to be moved about the drop for establishing a position to which no light is reflected.
  • the identifying means is a monocular of, for example, five times magnification, with its optical axis intersecting the drop.
  • the monocular is mounted on a carriage which runs on an upstanding arcuate track with its centre of curvature coincident with the drop.
  • the means for directing the light at the drop may also be mounted on the carriage.
  • the means for directing light may comprise a source situated between the monocular and the drop.
  • the monocular may, rather than identifying light reflected from the drop, identify a reflected image of the source.
  • High intensity LEDs, typically 3mm in diameter, are the preferred light sources.
  • the apparatus includes means for determining the angle of inclination of the monocular: Simple graduations marked on the apparatus, most conveniently the arcuate track, are suitable or more sophisticated electronic measuring equipment is one possible alternative.
  • the apparatus may also comprise means for supplying a drop of liquid, usually water, to the desired location on the surface, including a capillary tube extending from a liquid reservoir to the surface and a piston in the reservoir for forcing out the liquid, controlled by a micrometer screw.
  • a drop of liquid usually water
  • the means for supplying the drop may be used to increase or decrease the volume of the drop thereby enabling not only sessile drop measurement to be taken but also enables a determination of contact angle hysteresis, which involves changing the drop volume (increasing or decreasing) and remeasuring the contact angle.
  • the drop volume can be altered quickly and the contact angle remeasured.
  • the arcuate track and means for supplying the drop may both be mounted on a base having levelling means, such as adjustable screws.
  • a power supply for the light source may be integral with the carriage or mounted on the base.
  • the apparatus may be mounted on a chassis which incorporates a mechanical stage.
  • the apparatus may be detached from the chassis and placed directly on the specimen surface, protected if necessary by appropriate means. Remote operation is possible using an automatic or motorised version of the apparatus with miniature CCTV camera and position transducer.
  • Figure 1 is a side view of apparatus according to the invention.
  • Figure 2 is a plan view of the apparatus shown in figure 1 ;
  • Figure 3 is a schematic diagram illustrating the method of determination of contact angle.
  • contact angle measuring apparatus indicated generally at 1 has a substantially rectangular base 2 held above and spaced from a specimen X by four height adjustment screws 4 (one at each corner).
  • a carriage 7 Mounted adjacent one of the longitudinal edges of the base 2, on an upstanding arcuate track 6, is a carriage 7 supporting a five times magnification monocular 8 and a light source 10.
  • the monocular 8 and the light source 10 are arranged so that the longitudinal or optical axis of the monocular 8 and the direction of projection of the light source 10 are coincident.
  • the light source 10 is mounted between the monocular 8 and the specimen X and comprises a high intensity LED (not shown).
  • the carriage 7 is adapted to ran around the track 6 and is provided with a screw clamp 22 for holding the monocular 8 and light source 10 in any desired position.
  • the base 2 is adjusted such that the centre of curvature C of the track 6 coincides with the surface of specimen X.
  • the monocular 8 is orientated such that its optical axis intersects the centre of curvature C.
  • the track 6 is marked with angular reference graduations (not shown) to enable a determination of the angle of inclination of the optical axis of the monocular 8 with respect to the vertical.
  • a liquid delivery device 12 comprising a syringe-type arrangement with a capillary tube 14 for supplying a drop of liquid from a reservoir (not shown) to the point C.
  • the supply is controlled by a piston (not shown) in the reservoir which is operated using a micrometer screw 18 so as to enable precise operation.
  • a power supply 20 for the light source 10 is mounted on the base 2 as well.
  • the angle of contact between a liquid drop delivered to the surface of the specimen and the specimen surface is determined as follows: Firstly, a 0.01 ml drop of water 16 is delivered from the reservoir, via the tube 14 on to the point C.
  • the high intensity LED of the light source 10 projects a cone of light on to the drop 16. This light is reflected normally from the convex surface of the drop 16 along the optical axis of the monocular 8 such that it is possible to view an image of the LED in the monocular 8.
  • the LED is so positioned as to be out of focus when an image of the LED is viewed and, despite being between the monocular 8 and the drop 16, does not interfere with the image.
  • the user views the drop 16 through the monocular 8 and in particular notes the reflected image.
  • the user then moves the monocular 8 and light source 10 slowly along the track 6, increasing the angle of inclination with respect to the vertical, whilst still observing the drop 16, until the reflected image just disappears.
  • the absence of an image is indicative of the fact that light from the source 10 is being directed at the boundary between the drop 16 and the surface of the specimen X.
  • the light is directed from the source 10 on to the surface of the drop 16 and the reflection normal to the surface of the drop 16 is what forms the image.
  • the optical axis of the monocular 8 is effectively normal to a tangent to the surface of the drop 16 at its peripheral edge.
  • the angle between this tangent and the surface approximates very closely to the contact angle ⁇ between the surface of the drop 16 and the surface of the specimen X.
  • the angle of inclination of the monocular 8 with respect to the vertical is, by straightforward geometry, the same as and therefore the angle of inclination measurement gives a direct indication of ⁇ .

Abstract

On décrit un appareil pour mesurer l'angle de contact entre une goutte de liquide (16) et la surface d'un échantillon. L'appareil comprend une source de lumière (10), telle une DEL à haute intensité, qui projette de la lumière sur la goutte (16), et un moyen d'identification, tel qu'un monoculaire (8), pour observer la lumière réfléchie par la goutte (16). Le monoculaire (8) établit une position à laquelle aucune lumière n'est réfléchie en termes d'angle d'inclinaison de l'axe optique du monoculaire par rapport à l'axe vertical.
PCT/GB1999/002001 1998-06-26 1999-06-25 Appareil de mesure d'angle de contact WO2000000814A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0031412A GB2354831B (en) 1998-06-26 1999-06-25 Contact angle measuring apparatus
AU45219/99A AU4521999A (en) 1998-06-26 1999-06-25 Contact angle measuring apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9813717.7A GB9813717D0 (en) 1998-06-26 1998-06-26 Contact angle goniometer
GB9813717.7 1998-06-26

Publications (1)

Publication Number Publication Date
WO2000000814A1 true WO2000000814A1 (fr) 2000-01-06

Family

ID=10834363

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002001 WO2000000814A1 (fr) 1998-06-26 1999-06-25 Appareil de mesure d'angle de contact

Country Status (3)

Country Link
AU (1) AU4521999A (fr)
GB (2) GB9813717D0 (fr)
WO (1) WO2000000814A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003073045A1 (fr) * 2002-02-21 2003-09-04 Infineon Technologies Ag Mesure indirecte de l'angle de contact de liquides avec une surface
WO2006100010A1 (fr) * 2005-03-24 2006-09-28 Isra Dispositif et procede pour analyser une surface courbe
DE102014000419A1 (de) 2014-01-17 2015-07-23 Technische Universität Kaiserslautern Vorrichtung und Verfahren zur Bestimmung des Kontaktwinkels eines flüssigen oder mit Flüssigkeit gefüllten Körpers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053390A1 (de) * 1970-10-30 1972-05-04 Deutsche Forschungsgesellschaft für Druck und Reproduktionstechnik e.V., 8000 München Verfahren zur Bestimmung der Benetzbarkeit einer Oberfläche
JPS6085353A (ja) * 1983-10-17 1985-05-14 Fuji Photo Film Co Ltd 接触角測定方法
DE3808860A1 (de) * 1988-03-17 1989-10-05 Bayer Ag Verfahren zur automatischen messung der ober- bzw. grenzflaechenspannung zur optimierung von grenzflaechenphysikalischen vorgaengen
US5080484A (en) * 1988-04-29 1992-01-14 Texas Instruments Deutschland Gmbh Method of measuring the contact angle of wetting liquid on a solid surface
DE4102990A1 (de) * 1991-02-01 1992-08-13 Werner Wolfrum Messprinzip und messsystem zur bestimmung des randwinkels von fluessigkeitstropfen auf einer materialprobe mit glatter oder strukturierter oberflaeche
DE19845867A1 (de) * 1997-10-06 1999-07-22 Inst Polymerforschung Dresden Vorrichtung und Verfahren zur Bestimmung der Oberflächenspannung von Polymerschmelzen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053390A1 (de) * 1970-10-30 1972-05-04 Deutsche Forschungsgesellschaft für Druck und Reproduktionstechnik e.V., 8000 München Verfahren zur Bestimmung der Benetzbarkeit einer Oberfläche
JPS6085353A (ja) * 1983-10-17 1985-05-14 Fuji Photo Film Co Ltd 接触角測定方法
DE3808860A1 (de) * 1988-03-17 1989-10-05 Bayer Ag Verfahren zur automatischen messung der ober- bzw. grenzflaechenspannung zur optimierung von grenzflaechenphysikalischen vorgaengen
US5080484A (en) * 1988-04-29 1992-01-14 Texas Instruments Deutschland Gmbh Method of measuring the contact angle of wetting liquid on a solid surface
DE4102990A1 (de) * 1991-02-01 1992-08-13 Werner Wolfrum Messprinzip und messsystem zur bestimmung des randwinkels von fluessigkeitstropfen auf einer materialprobe mit glatter oder strukturierter oberflaeche
DE19845867A1 (de) * 1997-10-06 1999-07-22 Inst Polymerforschung Dresden Vorrichtung und Verfahren zur Bestimmung der Oberflächenspannung von Polymerschmelzen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 227 (P - 388) 13 September 1985 (1985-09-13) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003073045A1 (fr) * 2002-02-21 2003-09-04 Infineon Technologies Ag Mesure indirecte de l'angle de contact de liquides avec une surface
WO2006100010A1 (fr) * 2005-03-24 2006-09-28 Isra Dispositif et procede pour analyser une surface courbe
US7796276B2 (en) 2005-03-24 2010-09-14 Isra Vision Ag Apparatus and method for examining a curved surface
DE102014000419A1 (de) 2014-01-17 2015-07-23 Technische Universität Kaiserslautern Vorrichtung und Verfahren zur Bestimmung des Kontaktwinkels eines flüssigen oder mit Flüssigkeit gefüllten Körpers
WO2015107159A1 (fr) 2014-01-17 2015-07-23 Technische Universität Kaiserslautern Dispositif et procédé pour la détermination de l'angle de contact d'un corps liquide avec une surface de corps solide

Also Published As

Publication number Publication date
GB2354831A (en) 2001-04-04
AU4521999A (en) 2000-01-17
GB0031412D0 (en) 2001-02-07
GB9813717D0 (en) 1998-08-26
GB2354831B (en) 2002-04-10

Similar Documents

Publication Publication Date Title
US20040246483A1 (en) Method and a system for determination of particles in a liquid sample
US5080484A (en) Method of measuring the contact angle of wetting liquid on a solid surface
EP1530073B1 (fr) Appareil pour tomographie à projection optique avec support rotatif pour l'imagerie d'échantillon
US8508727B2 (en) Defects inspecting apparatus and defects inspecting method
EP0265229A2 (fr) Méthode et appareil pour la détection de particules
US20070132989A1 (en) Devices and methods for inspecting optical elements with a view to contamination
KR20130095211A (ko) 얇은 디스크 형상물의 가장자리 프로파일을 비접촉으로 결정하기 위한 장치
EP0766063B1 (fr) Mesure de paramètres de lentilles par la section optique
EP2912440B1 (fr) Dispositif de contrôle de qualité optique
WO2001082781B1 (fr) Systeme d'inspection iterative avec outils intelligents
JP2019215321A (ja) 溶液に浸された眼用レンズの屈折力および厚さを検査するためのシステムおよび方法
JPH11230886A (ja) 接触角測定装置および接触角測定方法
US6301007B1 (en) Machine tool locator
US5801822A (en) Ophthalmic lens inspection system
JP2007078635A (ja) 校正用治具、及び画像測定機のオフセット算出方法
US6833918B2 (en) Light scattering particle size distribution measuring apparatus and method of use
WO2000000814A1 (fr) Appareil de mesure d'angle de contact
KR19980080031A (ko) 투명물체 검사방법, 이에 사용되는 장치 및 검사시스템
US4860329A (en) X-ray fluorescence thickness measuring device
US6765684B2 (en) Surface shape measurement apparatus
EP0390478A1 (fr) Appareil à rayons X pour mesurer l'épaisseur d'un film
US6881587B2 (en) Liquid-containing substance analyzing device and liquid-containing substance analyzing method
CN115096219A (zh) 用于透明陶瓷板拼接平面度的检测装置及半定量测试方法
US4449048A (en) Workpiece positioning system for beta ray measuring instruments
KR20090007172A (ko) 판유리 두께측정장치

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
ENP Entry into the national phase

Ref country code: GB

Ref document number: 200031412

Kind code of ref document: A

Format of ref document f/p: F

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase