EP2512277A2 - Dispositif à adhésion commandable - Google Patents

Dispositif à adhésion commandable

Info

Publication number
EP2512277A2
EP2512277A2 EP10803226A EP10803226A EP2512277A2 EP 2512277 A2 EP2512277 A2 EP 2512277A2 EP 10803226 A EP10803226 A EP 10803226A EP 10803226 A EP10803226 A EP 10803226A EP 2512277 A2 EP2512277 A2 EP 2512277A2
Authority
EP
European Patent Office
Prior art keywords
depression
contact surface
adhesion
common contact
combination according
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.)
Withdrawn
Application number
EP10803226A
Other languages
German (de)
English (en)
Inventor
Eduard Arzt
Robert Mcmeeking
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.)
Leibniz Institut fuer Neue Materialien Gemeinnuetzige GmbH
Original Assignee
Leibniz Institut fuer Neue Materialien Gemeinnuetzige GmbH
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 Leibniz Institut fuer Neue Materialien Gemeinnuetzige GmbH filed Critical Leibniz Institut fuer Neue Materialien Gemeinnuetzige GmbH
Publication of EP2512277A2 publication Critical patent/EP2512277A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/31—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive effect being based on a Gecko structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24562—Interlaminar spaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet

Definitions

  • the invention relates to devices with controllable adhesion.
  • Adhesion forces between surfaces can arise in different ways. A distinction is made between mechanical bonding, such as clamping and anchoring ("Velcro"), chemical bonding, such as covalent bonds or charges, and physical bonding, such as van der Waals forces. Especially the physical bond, i. Van der Waals forces are important for many technical and biological systems.
  • the object of the invention is to provide a combination of a first and a second device.
  • the combination should allow the adhesion forces between the two devices to be controlled.
  • the invention is also intended to specify a device which allows control of the adhesion and a corresponding method.
  • the invention relates to a combination of a first device and a second device, wherein both devices have at least one surface, and the surface of the first device has at least one recess; and at least one contact surface is formed when the surface of the first device is attached to the surface of the second device.
  • the term contact surface is understood to mean the surface covered by the attachment of the first device on the surface of the second device from the point of view of the second device.
  • the first device has at least one depression on this surface. Under a depression is meant an inward deviation of the surface, in particular of an ideal geometric surface. Such Deepening can be designed very differently. It is usually defined by its extent and by its depth profile. The extent of a depression is the area of the area of the surface without a depression, which is occupied by the depression.
  • the extent can be regular or irregular. It can be different in length and width. It can be geometrically shaped, such as elliptical, polygonal, rectangular, square, circular, star-shaped, but also irregular.
  • the depth profile of the recess may be symmetrical, such as pyramidal, hemispherical or domed or unsymmetrical.
  • the surface of the first device may include a plurality of wells. These may, for example, be arranged in a regular pattern, such as hexagonal, tetragonal.
  • the distances between the recesses may be greater or smaller than the extent of the respective recesses, preferably a dense arrangement of the recesses side by side. This means tight that between two wells is no more distance than the largest diameter of the two wells.
  • Different recesses may also be arranged on the same surface.
  • the surface of the first device may also comprise a coating, wherein the coating has at least one recess.
  • the coating is at least as thick as the maximum depth of the depression. If the coating completely contains the at least one depression, the information on the material properties does not apply to the entire first device but to the material of the coating.
  • the surface of the first device which has at least one depression, is advantageously a micro- or nanostructured surface.
  • a microstructure is understood to mean a structure which has at least one dimension which is smaller than one millimeter but larger than one micrometer.
  • nanostructures have at least one dimension which is smaller than one micrometer but larger than one nanometer.
  • the recesses are part of the structuring of the surface.
  • the depressions thus have at least one dimension which corresponds to the structuring of the surface.
  • the greatest depth of a depression can be between 5 nm and 10 mm.
  • a maximum depth between 10 nm and 10 ⁇ .
  • the depth may also be in the macro range, e.g. below 1 cm, e.g. between 1 and 1 cm.
  • the largest diameter of the recess may be between 10 nm and 10 mm.
  • a largest diameter is between 10 nm and 10 ⁇ m.
  • the diameter may also be in the macro range, e.g. between 1 mm and 10 cm.
  • these are shallow depressions.
  • the ratio of their largest diameter to their greatest depth is more than 2: 1, preferably more than 10: 1.
  • the second device is attached in the combination to the surface of the first device having the at least one recess. Attachment involves any form of contacting surfaces. In the process, the contact surface is formed. In this contact area, two areas must be distinguished. The common contact area is an area which is common to both surfaces, i. where direct contact exists. This means directly that touch both surfaces. Due to the depressions, this contact surface in the at least one depression has at least one region which has not formed a common contact surface with the surface of the second device, for example if the attached surface of the second device has the at least one depression of the surface of the first device at least partially covered. Preferably, the at least one depression is completely covered by the contact surface. This means that the recess is closed by the attachment of the surface of the second device.
  • the surface of the second device is preferably a surface without structuring, in particular it has no
  • This state can be adjusted either at constant external pressure and / or tension on at least one of the devices or even without external pressure, as well as when the external pressure and / or train after formation of the at least one common contact surface is eliminated.
  • the common contact surface, as well as the at least one region without a common contact surface remain constant over time.
  • the size of the common contact surface in this state also determines the energy to be dissipated.
  • the adhesive force between the surfaces causes the surface of the second device to be forced into or retracted into the depression and / or the depression to flatten somewhat. In the limiting case, this leads to the fact that the entire depression is filled by the adhesive force deformed by the second device due to the adhesion forces. If the elasticity is at least ner of the two devices is lower, it can also happen that only a part of the recess is filled. This can also be caused by trapped air.
  • the at least one region without a common contact surface can be reversibly enlarged or reduced by pressure or tension applied to at least one of the devices. As a result, the common contact area is correspondingly reduced or enlarged.
  • the common contact surface can be reversibly converted into at least one further state by pressure or tension exerted on at least one of the devices.
  • This state may be another state of equilibrium, but also a state in which the common contact surface is maximized. This can be the case, for example, when strong adhesion forces cause the area without a common contact area in a depression to completely disappear, thus completely filling the depression. Thereafter, no further enlargement of the common contact surface in this depression is possible in this depression. The common contact area is maximum for this depression. This can also mean that trapped air or another state of equilibrium prevent further enlargement.
  • adhesion of the surfaces forms the first equilibrium state, in which the contact surface in the at least one depression still has at least one region which has not formed a common contact surface.
  • the combination may be transitioned from the first equilibrium state to the second equilibrium state.
  • the common contact surface is larger in this state and the adhesion forces therefore stronger. To completely detach the surfaces, a higher force must be used.
  • the combination is thus a combination with controllable adhesion.
  • the first state is an equilibrium state and the second state is the state in which the common contact area is maximum. This is a combination with a bistable adhesion.
  • the material of the surface of the first device is preferably a material which allows the production of relief structures in the above-mentioned orders of magnitude.
  • These may be, for example, embossing methods, such as roll embossing, Hot embossing or reactive embossing, stamping or lithographic processes. The method used determines the materials used.
  • organic or inorganic polymers such as polyacrylic acid, polymethacrylic acid, polyacrylates, polymethacrylates, polyolefins, polystyrene, polyamides, polyimides, polyvinyl compounds, such as polyvinyl chloride, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate and corresponding copolymers, eg. As poly (ethylene vinyl acetate), polyester, z.
  • polyethylene terephthalate or polydiallyl phthalate polyarylates
  • polycarbonates polyethers, z.
  • polyoxymethylene, polyethylene oxide or polyphenylene oxide, polyether ketones, polysulfones, polyepoxides and fluoropolymers eg. As polytetrafluoroethylene or polysiloxanes. They may also be cationically or anionically polymerizable polymers. It is also possible to use composite materials which consist of organic and inorganic constituents, such as organically modified inorganic polycondensates, which may also contain nanoparticles. Examples of materials are described, for example, in WO 2005/014745 A1 or DE
  • the surfaces advantageously have a modulus of elasticity of at least 1 MPa, preferably between 1 MPa (PDMS, polydimethylsiloxane) and 10 GPa (solid keratin). It is preferred that the first device has a higher modulus of elasticity than the second device.
  • the elastic modulus can be determined by means of an indentation test or an adhesion test.
  • the depressions may have further properties.
  • the materials of the devices may be porous to allow the escape of air.
  • the invention also relates to a device having a textured surface with controllable adhesion to a surface.
  • This device essentially corresponds to the first device of the combination described above.
  • By applying pressure to the device can be switched between at least two stands to ⁇ different adhesive force.
  • the respective surfaces in addition to increasing (or decreasing) the adhesion, may themselves be microstructured, as described, for example, in WO 2008/049517 A1.
  • the invention also relates to a method for controlling the adhesion of a combination.
  • the surface with depression of the first device is attached to the surface of the second device.
  • the common contact surface is formed. It may be necessary to press the surfaces together with a certain pressure.
  • the first state can be produced with a region without a common contact surface. If the compressive stress is lower, an equilibrium state is achieved as a function of the material constants.
  • a compressive stress is applied which is higher than the first compressive stress.
  • the at least one further state of the combination forms. Since in this state, the common contact area is greater, the adhesion of the two devices is correspondingly larger.
  • the first state can be reached again by attaching a tensile stress.
  • foils, sheets or surfaces such surface structures may allow these foils, sheets or surfaces to be attached to the surfaces first and only when the position is right, by increasing the pressure, the contact surface in the further or second state with higher adhesion brings and so finally attached. They are suitable for use in household or industry but also clothing. Large-area applications are possible. Thus, the wells can be easily applied to films.
  • the recess 18 may be described by the following forms where ⁇ 0 is the maximum depth and ⁇ ( ⁇ ) is the elliptic integral of the second kind of variable ⁇ and ⁇ ( ⁇ ) is the elliptical integral of the first kind of variable ⁇ .
  • b is the effective radius of the depression.
  • a schematic representation of the depression can be found in FIG. 1. At this surface 16 of the first device 10, a structureless surface 14 of the second device 12 is deposited.
  • adhesion forces which act via the work of adhesion (w 0 ), ie the reduction of the potential energy per unit of the attachment surface according to the formula where Yi is the surface energy of the first device 10 and ⁇ 2 is the surface energy of the second device 12 and Yi 2 is the interfacial energy of the two surfaces in contact.
  • Both devices are advantageously linear elastically at least on the surfaces and possibly isotropic with the moduli of elasticity Ei and E 2 of the first and second devices and Vi and v 2 are the respective Poisson numbers.
  • the specifications for the material of the respective coating of the devices apply.
  • the recess 18 is considered to be flat ( ⁇ 0 ⁇ £>), so that elastic deformations caused by tensile forces on the device having the recess as deformation of the second device 12 with a flat surface 14 can be calculated.
  • a common contact surface 20 has formed between the two surfaces, which also completely includes the surface of the recess.
  • the contact surface 24 corresponds to the common contact surface
  • FIG. 4 shows graphs of these equations for r A T against
  • FIG. 4 shows a graph for > 2 ⁇ (a value of bw n
  • FIG. 4b shows a graph for --- ⁇ 2 ⁇ (a value of 4,712 was chosen).
  • the acting tensile stress in equilibrium with the area 22 without a common contact surface is always pulling (i.e., positive).
  • Stable equilibrium states are local or global minima of potential energy, U (a, a A ), of the system, where U is composed of contributions from elasticity, surface and interfacial energy, and the potential energy of the acting stress. From the fracture mechanics follows: dU
  • Figure 4 also discloses a particular behavior with increasing pressure on both surfaces.
  • the area of the area having no common contact area a (a becomes smaller). All- Now the equilibrium becomes unstable if a assumes the value b. This means that the radius a will continue to decrease until it is 0, ie the area without contact area is no longer present. However, trapped air or the depth profile of the depression may cause the area without contact area to disappear completely. In these cases, it is only minimized, ie it assumes the size which is minimally possible at the acting pressure.
  • the decisive factor is that, as in the case of the replacement of the two surfaces, the minimization of the area without a common contact surface can no longer be stopped, even when the pressure is reduced, since it is an unstable equilibrium.
  • the model clearly shows a bistable adhesion.
  • the first stable equilibrium can be achieved, either at annealing or after applying a certain pressure. If more pressure is applied in a second step, the system can be brought into the second state. There, the maximum contact area is maximal and there is a higher adhesion of the two surfaces.
  • Figure 4a shows as a dashed line and the course of equilibrium, taking into account the Dugdale model
  • Figure 6 shows different arrangements of the depressions on the surface. It is also possible for recesses of different sizes (FIG. 6c) to be formed on the surface. Since different tensile stresses have to act for each of these surfaces with parameters identical to size, in order to change between the at least two states of the respective depression, surfaces can be created which have a total of three or more different adhesion stages.
  • Reference numeral first device

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Prostheses (AREA)
  • Micromachines (AREA)
  • Laminated Bodies (AREA)
  • Brushes (AREA)
  • Air Bags (AREA)
  • Golf Clubs (AREA)

Abstract

L'invention concerne l'association d'un premier dispositif et d'un second dispositif, les deux dispositifs présentant au moins une surface, la surface du premier dispositif comportant au moins un évidement. Cette association forme au moins une surface de contact lors de l'application de la surface du premier dispositif sur la surface du second dispositif. La force d'adhésion entre les deux dispositifs peut commuter entre au moins deux états par application d'une pression extérieure.
EP10803226A 2009-12-16 2010-12-15 Dispositif à adhésion commandable Withdrawn EP2512277A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009058651A DE102009058651A1 (de) 2009-12-16 2009-12-16 Vorrichtung mit steuerbarer Adhäsion
PCT/EP2010/007633 WO2011082779A2 (fr) 2009-12-16 2010-12-15 Dispositif à adhésion commandable

Publications (1)

Publication Number Publication Date
EP2512277A2 true EP2512277A2 (fr) 2012-10-24

Family

ID=44305851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10803226A Withdrawn EP2512277A2 (fr) 2009-12-16 2010-12-15 Dispositif à adhésion commandable

Country Status (4)

Country Link
US (1) US9290678B2 (fr)
EP (1) EP2512277A2 (fr)
DE (1) DE102009058651A1 (fr)
WO (1) WO2011082779A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2717633C (fr) * 2009-10-14 2018-06-19 Simon Fraser University Adhesifs biomimetiques secs et procedes de fabrication connexes
BR112013029041A2 (pt) * 2011-05-13 2017-06-27 Mylan Group adesivos secos
DE102013114332A1 (de) 2013-12-18 2015-06-18 Vorwerk & Co. Interholding Gmbh Trockenreinigungseinrichtung für ein Haushaltsreinigungssystem
DE102014119470A1 (de) 2014-12-22 2016-06-23 Leibniz-Institut Für Neue Materialien Gemeinnützige Gmbh Strukturierte Oberfläche mit stufenweise schaltbarer Adhäsion
DE102015219756A1 (de) * 2015-10-13 2017-04-13 Bayerische Motoren Werke Aktiengesellschaft Verbindung, Verbindungssystem und Verfahren zum Verbinden von wenigstens zwei Bauteilen
DE102020108107B3 (de) * 2020-03-24 2020-10-15 Simonswerk Gmbh Befestigung von Abdeckplatten

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US5897930A (en) * 1996-12-31 1999-04-27 Minnesota Mining And Manufacturing Company Multiple embossed webs
US6159596A (en) * 1997-12-23 2000-12-12 3M Innovative Properties Company Self mating adhesive fastener element articles including a self mating adhesive fastener element and methods for producing and using
US7144616B1 (en) * 1999-06-28 2006-12-05 California Institute Of Technology Microfabricated elastomeric valve and pump systems
DE10001135A1 (de) 2000-01-13 2001-07-19 Inst Neue Mat Gemein Gmbh Verfahren zur Herstellung eines mikrostrukturierten Oberflächenreliefs durch Prägen thixotroper Schichten
US6838142B2 (en) * 2001-05-18 2005-01-04 3M Innovative Properties Company Specular laminates
US8323773B2 (en) * 2001-10-09 2012-12-04 3M Innovative Properties Company Laminates with structured layers
ATE434781T1 (de) * 2002-04-03 2009-07-15 3M Innovative Properties Co Produkte zur anzeige der zeit oder zeit- temperatur
US7678443B2 (en) * 2003-05-16 2010-03-16 3M Innovative Properties Company Complex microstructure film
WO2005014745A1 (fr) 2003-07-22 2005-02-17 Leibniz-Institut Für Neue Materialien Gemeinnützige Gmbh Composition de revetement hydrofuge a resistance alcaline et revetement approprie a la formation de motifs
DE102006050365A1 (de) 2006-10-25 2008-04-30 MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. Strukturierte Oberfläche mit schaltbarer Haftfähigkeit
US7975971B2 (en) 2006-11-15 2011-07-12 Carnevali Jeffrey D Suction cup device
US8372230B2 (en) * 2007-03-30 2013-02-12 The Trustees Of The University Of Pennsylvania Adhesives with mechanical tunable adhesion
WO2009151678A1 (fr) * 2008-03-11 2009-12-17 Massachusetts Institute Of Technology Surfaces sensibles aux stimuli

Non-Patent Citations (2)

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Title
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See also references of WO2011082779A2 *

Also Published As

Publication number Publication date
US20120258287A1 (en) 2012-10-11
WO2011082779A3 (fr) 2011-10-13
US9290678B2 (en) 2016-03-22
WO2011082779A2 (fr) 2011-07-14
DE102009058651A1 (de) 2011-06-22

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