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WO2001022058A1 - Analyseur d'angle de contact - Google Patents

Analyseur d'angle de contact Download PDF

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Publication number
WO2001022058A1
WO2001022058A1 PCT/US2000/025665 US0025665W WO0122058A1 WO 2001022058 A1 WO2001022058 A1 WO 2001022058A1 US 0025665 W US0025665 W US 0025665W WO 0122058 A1 WO0122058 A1 WO 0122058A1
Authority
WO
WIPO (PCT)
Prior art keywords
droplet
marker
liquid drop
lighted marker
lighted
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2000/025665
Other languages
English (en)
Other versions
WO2001022058A9 (fr
Inventor
Roger P. Woodward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
First Ten Angstroms
Original Assignee
First Ten Angstroms
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 First Ten Angstroms filed Critical First Ten Angstroms
Priority to AU75912/00A priority Critical patent/AU7591200A/en
Publication of WO2001022058A1 publication Critical patent/WO2001022058A1/fr
Anticipated expiration legal-status Critical
Publication of WO2001022058A9 publication Critical patent/WO2001022058A9/fr
Ceased legal-status Critical Current

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
    • 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 present invention generally relates to the measurement of characteristics of the interface between a liquid drop on a solid substrate in an atmosphere and, more particularly, to a method and apparatus which easily and repeatably measures contact angle.
  • apparatus and computer software which analyzes drop shapes to give contact angle data without operator intervention or judgement.
  • Using a pre-aligned, fixed optical system light and shadows are used to obtain a precise measurement of the contact angle between the drop and the surface.
  • Two “markers” are used to accurately determine the "horizon" or the base line of the droplet. Each marker casts a shadow, just like the drop, due to back lighting.
  • the image processing algorithm can find the boundary between illumination levels. The algorithm can then accurately determine the base line of the droplet and the contact angle.
  • Figure 1 is a cross sectional view of a droplet on a specimen surface, showing contact angle ⁇ ;
  • Figure 2 is a view of a droplet on a specimen surface, taken from a 90° angle
  • Figure 3a is a view of a droplet on a specimen surface, taken from the typical angle between 2-5°;
  • Figure 3b is a side view of the droplet shown in Figure 3a;
  • Figure 4 is a front cross sectional view of the inventive apparatus;
  • Figure 5 is a side cross sectional view of the inventive apparatus;
  • Figure 6 is a view of a droplet on a specimen surface, taken from the typical angle between 2-5°, using the inventive apparatus;
  • Figure 7 is schematic of the equipment configuration of the invention; and Figure 8 is a schematic of the general data flow as captured by the equipment configuration shown in Figure 7.
  • FIG. 1 there is shown a cross sectional view of a droplet 1 on the surface of a specimen 2.
  • a tangent 3 to droplet 1 drawn through the point 4 which droplet 1 contacts specimen 2 forms contact angle ⁇ .
  • the baseline i.e., the location of the liquid-solid interface in the image.
  • the baseline is where the drop
  • FIG. 4 shows a front cross sectional view of the inventive apparatus. As can be seen, there is a through hole holding a needle 21 for dispensing a droplet. There are at least 2 holes 22 for holding fiber optics which glow at their ends. One light source may be used instead of 2. Additionally, very small LED * s or incandescent bulbs may also be used.
  • the material for the apparatus of Figure 5 and the illumination source i.e., fiber optics, LED's, etc.
  • the illumination source i.e., fiber optics, LED's, etc.
  • This figure shows a sample pendant drop 24 ready to fall between glowing regions 23 of the fiber optic.
  • the side cross sectional view of the apparatus is shown in Figure 5.
  • the through hole for the needle is positioned to be perpendicular to a specimen surface and the through holes for fiber optics are positioned at an angle, as a convenience for bringing the fiber optic close to the front surface.
  • Figure 6 shows a situation similar to that which is shown in Figure 3a. except that the image is produced with the inventive apparatus in use.
  • a material which disperses light such as Teflon® or ground glass is used to construct markers 36 for droplets 34 which rest on the surface of the nominally flat specimen 31.
  • Markers 36 can be viewed as being analogous to regions 23 shown in Figure 4.
  • the front 32 and rear edges 33 may or may not appear in the microscope image. What appears at the top and bottom of the image is completely irrelevant to the method.
  • Marker 36 casts a shadow 37 which highlights the position of the baseline 35 for the droplet 34.
  • each marker 36 is coplanar with the center line of the drop 34, so the curved edge which is imaged and measured is in the same focal plane of the (front) surface of the marker 36. What is traced as the silhouette's edge is an "equatorial" line across the top of the drop 34. This arrangement keeps everything in optical focus and at the right geometrical position in the image. So now the imaged edges of the marker 36 will lie in approximately the same focal plane as the imaged and measured edge 39 of the drop 34.
  • the marker 36 has a distinctly visible bottom edge because of its lighting. It casts a shadow 37 just like the drop 34, because it too is back lit. However, it also emanates light, being lit from above by controllable lamps, so there are two distinct illumination levels in the marker image. With this invention, it is guaranteed that there will be two distinct illumination levels and they will meet or transition at the bottom edge of the marker 36 where it rests on the specimen 31 surface.
  • the marker 36 itself will be brighter, and its shadow 37 will be darker.
  • the image processing algorithm can find this boundary between illumination levels. They will always be different because one is lit and emanating light and the other is a passive shadow, that facilitates the automatic edge finding algorithms.
  • the contrast edge 38 will be coplanar with the drop's edge that is measured.
  • the contrast edge 38 will be coplanar with the "equatorial" edge that is measured. That is, both are the same distance from the microscope ("far/near").
  • the contrast edge 38 between 36 and 37 are at the same height as the baseline 35.
  • the baseline position is tied to the contrast edge 38 position.
  • the image processing algorithm draws a straight line between the left and right marker edge transitions, along the line indicated by the arrows in the figure. This line drawn by the algorithm passes through the desired baseline, by geometry of the system. To complete this, on a practical instrument the dispensing needle (a blunt end hypodermic needle) comes through a guide just above the visible portion of the image in these illustrations.
  • FIGs 7 and 8 show sequences of operation of the process for the inventive apparatus. As can be seen in Figure 7, a trigger 61 releases a drop.
  • live images 63 may be sent directly to the SVGA display 64 or may be recorded in a captured movie 65 to be displayed on an SVGA display 64.
  • An analysis 66 of the captured movie 65 in which an algorithm is applied to recorded variables produces graphs, exported tables, and database tables.
  • Figure 8 shows a syringe pump 81 releasing a droplet 82 to the surface of a specimen 83 on a base 84 which may be raised or lowered.
  • a camera 86 records the droplet and sends images to a continuous frame grabber 87. These images can go to the system memory 88 and then to software 89 for analysis or the image can go directly to the software 89. From system memory, the images may be recorded on a disk or tape archive 90.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un appareil servant à mesurer un angle de contact, une tension superficielle et une énergie de surface. Cet appareil utilise des ombres pour déterminer une ligne de base entre une gouttelette (1) et la surface d'un échantillon (2). Cette opération permet d'effectuer des mesures de précision lors de l'enregistrement de données à partir d'un angle. Ledit appareil utilise un système optique fixe pré-aligné. Une lumière et des ombres servent à obtenir une mesure précise de l'angle de contact entre une goutte (1) et ladite surface (2). Deux marqueurs déterminent la ligne de base de la gouttelette. Chaque marqueur projette une ombre, de même que la goutte, due à un éclairage arrière. Avec deux niveaux d'éclairage distincts dans l'image de ces marqueurs, l'un correspondant à cette ombre et l'autre à une lumière provenant d'un éclairage supérieur régulable, un algorithme de traitement d'image peut trouver la limite séparant ces niveaux d'éclairage. Cet algorithme peut alors déterminer avec précision la ligne de base de la gouttelette et l'angle de contact.
PCT/US2000/025665 1999-09-23 2000-09-20 Analyseur d'angle de contact Ceased WO2001022058A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU75912/00A AU7591200A (en) 1999-09-23 2000-09-20 Contact angle analyzer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40130199A 1999-09-23 1999-09-23
US09/401,301 1999-09-23

Publications (2)

Publication Number Publication Date
WO2001022058A1 true WO2001022058A1 (fr) 2001-03-29
WO2001022058A9 WO2001022058A9 (fr) 2002-11-21

Family

ID=23587174

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/025665 Ceased WO2001022058A1 (fr) 1999-09-23 2000-09-20 Analyseur d'angle de contact

Country Status (2)

Country Link
AU (1) AU7591200A (fr)
WO (1) WO2001022058A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021232A1 (fr) * 2001-08-24 2003-03-13 Symyx Technologies, Inc. Test rapide en serie de determination de proprietes mecaniques a haute capacite de bibliotheque de matieres
WO2005008220A1 (fr) * 2003-07-14 2005-01-27 Alcon, Inc. Systeme et procede de mesure d'angle de contact dynamique
FR2867268A1 (fr) * 2004-07-01 2005-09-09 Commissariat Energie Atomique Procede et methode de determination d'une caracteristique d'un volume de liquide
DE102014211369A1 (de) * 2014-06-13 2015-12-17 Sita Messtechnik Gmbh Kontaktwinkelmessgerät
CN106645366A (zh) * 2016-12-14 2017-05-10 东北大学 一种测定金属表面能的装置和方法
CN107817193A (zh) * 2017-10-27 2018-03-20 清华大学 基于局部圆拟合的超疏水固体表面接触角测量方法及系统
CN109406344A (zh) * 2018-09-18 2019-03-01 上海航天化工应用研究所 一种表征叠氮聚醚弹性体表界面特性的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109724898B (zh) * 2019-01-30 2021-05-18 湖北中烟工业有限责任公司 一种烟用接装纸表面润湿性能的检测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5115677A (en) * 1989-04-06 1992-05-26 Photonetics Methods and devices for determining the contact angle of a drop of liquid placed on a substrate
US5137352A (en) * 1991-02-05 1992-08-11 Tantec, Inc. Method and apparatus for determining the contact angle of liquid droplets on curved substrate surfaces
US5268733A (en) * 1992-10-21 1993-12-07 Tantec, Inc. Method and apparatus for measuring contact angles of liquid droplets on substrate surfaces
US5583285A (en) * 1994-11-29 1996-12-10 Lucent Technologies Inc. Method for detecting a coating material on a substrate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5115677A (en) * 1989-04-06 1992-05-26 Photonetics Methods and devices for determining the contact angle of a drop of liquid placed on a substrate
US5137352A (en) * 1991-02-05 1992-08-11 Tantec, Inc. Method and apparatus for determining the contact angle of liquid droplets on curved substrate surfaces
US5268733A (en) * 1992-10-21 1993-12-07 Tantec, Inc. Method and apparatus for measuring contact angles of liquid droplets on substrate surfaces
US5583285A (en) * 1994-11-29 1996-12-10 Lucent Technologies Inc. Method for detecting a coating material on a substrate

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003021232A1 (fr) * 2001-08-24 2003-03-13 Symyx Technologies, Inc. Test rapide en serie de determination de proprietes mecaniques a haute capacite de bibliotheque de matieres
US6857309B2 (en) 2001-08-24 2005-02-22 Symyx Technologies, Inc. High throughput mechanical rapid serial property testing of materials libraries
WO2005008220A1 (fr) * 2003-07-14 2005-01-27 Alcon, Inc. Systeme et procede de mesure d'angle de contact dynamique
FR2867268A1 (fr) * 2004-07-01 2005-09-09 Commissariat Energie Atomique Procede et methode de determination d'une caracteristique d'un volume de liquide
DE102014211369A1 (de) * 2014-06-13 2015-12-17 Sita Messtechnik Gmbh Kontaktwinkelmessgerät
DE102014211369A8 (de) * 2014-06-13 2016-02-18 Sita Messtechnik Gmbh Kontaktwinkelmessgerät
US9322760B2 (en) 2014-06-13 2016-04-26 Sita Messtechnik Gmbh Contact angle measuring instrument
DE102014211369B4 (de) 2014-06-13 2022-03-10 Sita Messtechnik Gmbh Kontaktwinkelmessgerät
CN106645366A (zh) * 2016-12-14 2017-05-10 东北大学 一种测定金属表面能的装置和方法
CN107817193A (zh) * 2017-10-27 2018-03-20 清华大学 基于局部圆拟合的超疏水固体表面接触角测量方法及系统
CN107817193B (zh) * 2017-10-27 2020-12-04 清华大学 基于局部圆拟合的超疏水固体表面接触角测量方法及系统
CN109406344A (zh) * 2018-09-18 2019-03-01 上海航天化工应用研究所 一种表征叠氮聚醚弹性体表界面特性的方法

Also Published As

Publication number Publication date
AU7591200A (en) 2001-04-24
WO2001022058A9 (fr) 2002-11-21

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