Self-assembling monolayer silane films as adhesion promoters

Cave, N.; Kinloch, A. J.

doi:10.1016/0032-3861(92)90760-t

Cited by 39 publications

(33 citation statements)

References 23 publications

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“…Figure 1 also gives the forcefield potential types to be discussed in the methodology section. The main features of these molecules are the -Si(OH) 2 O-group which provides the anchor 4 In particular the film density was estimated from the experimental results. In this contribution we will investigate the effect of film density on the structure of the coating.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the structure of organosilane film coatings

Hayes¹,

Watson²,

Willock³

2006

Molecular Simulation

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Section: Introductionmentioning

confidence: 99%

Simulation of the structure of organosilane film coatings

Hayes¹,

Watson²,

Willock³

2006

Molecular Simulation

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“…For example, the validation of this approach by using molecular dynamics and XPS analysis of an adhesion failure surface has shown it to be robust and adaptable [15]. Indeed, the fact that the VTS molecules are oriented at approximately 60° to the plane of the substrate has been reported by previous experimental [7] and theoretical studies [8]. Finally, the loss structures associated with the VTS layer discussed above show that the layer is not present as a patchy overlayer, which would not provide such intense energy-loss structures, giving additional security to the interpretation of the data as a monolayer of VTS molecules in a slanting, rather than normal, orientation.…”

Section: X-ray Photoelectron Spectroscopy Studiesmentioning

confidence: 87%

Novel Self-Assembling Silane for Abhesive and Adhesive Applications

Kinloch

Tan

Watts

2006

The Journal of Adhesion

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The potential benefits from using a novel vinyl-terminated long alkyl-chain self-assembling silane (VTS) have been investigated. A relatively high water contact-angle of 83° was found for water on the VTS-pretreated soda-lime glass surface. This revealed that the degree of hydrophobicity of this surface was far more pronounced than for the ultrasonically-cleaned glass surface or the γ-glycidoxypropyltrimethoxy silane (GPS)-pretreated glass surface, which gave contact angles of 14° and 42°, respectively. Further, good agreement between the measured and the theoretical contact angles for a fully adsorbed vinyl-terminated self-assembled monolayer surface implied that the VTS molecules were adsorbed with the vinyl-terminal groups orientated away from the glass surface. Indeed, X-ray photoelectron spectroscopy (XPS) analysis confirmed that the VTS molecules were adsorbed as a monolayer with the vinyl-terminal groups orientated away from the glass surface. Double-cantilever beam joints were prepared using these various pretreated-glass substrates, using an epoxy adhesive, and they were tested employing a fracture-mechanics approach. The adhesive fracture energy, G c , of the VTS-pretreated glass/epoxy joints was found to be far lower in value than for the ultrasonically-cleaned joints or the GPS-pretreated joints. The potential applications of this novel long alkyl-chain silane are two-fold: (a) the relatively very poor adhesion of the VTS pretreatment enables this silane to be used as an excellent abhesive layer, i.e. as a release agent, and (b) the presence of reactive vinyl-terminal groups might allow this silane to be activated to form functional groups that may then react with an adhesive, such as an epoxy resin, and so act as an excellent adhesion promoter to increase the durability of the adhesive joint.Keywords: Abhesion, accelerated testing, durability, glass, monolayers, organosilane adhesion promoters, XPS 2 IntroductionCommercially-available short alkyl-chain silane primers have been used extensively to decrease the susceptibility of the adhesive-substrate interface to attack by water, see for example [1][2][3]. The ability of these silanes to promote enhanced adhesion to metallic and ceramic substrates is a result of the specific interaction, via a condensation reaction, between the silanols of the hydrolysed silane with hydroxyl groups present on the surface of the substrate to form covalent bonds [1][2]. Typically there is also a functional terminalgroup at the other end of the silane molecule which may react with the adhesive. Thus, silanes may 'couple', via covalent bonding, the substrate to the adhesive.However, such commercially-available silane primers have a relatively short alkylchain in their chemical structure, and typically adsorb onto the surface of the substrate as disordered multilayer layers. For example, γ-glycidoxypropyltrimethoxysilane (GPS)typically adsorbs with approximately 50 % of the silanol groups pointing upwards and 50 % pointing downwards [4], and typically forms a mult...

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“…However, all authors do not agree with this statement, probably because of the differences in procedures and substrates. It is thus usually considered that a range of lengths between C 12 and C 18 should be used to obtain a stable and well-packed alkylsiloxane SAM [116,117]. Hoffmann et al [118] have shown that the shorter the alkyl chain is, the more disordered is the monolayer for a given amount of water.…”

Section: Chain Length Order and Defectsmentioning

confidence: 99%

Surface treatment and characterization: Perspectives to electrophoresis and lab‐on‐chips

et al. 2006

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The control and modification of surface state is a major challenge in bioanalytical sciences, and in particular in electrokinetic separation methods, due to the importance of electroosmosis. This topic has gained recently a renewed interest, associated with the development of "lab-on-chips" systems that extend the range of materials in which separation channels are fabricated. The surface science community has developed through the years a large toolbox of characterization tools and surface modification protocols, which is not yet fully exploited in the bioanalytical world. In this paper, we try and present an overview of these tools, in order to stimulate new ideas for improved and more controlled surface treatment strategies for separations in capillaries and microchannels. We briefly describe some physical and chemical aspects of electroosmosis (global and spatially resolved), streaming current, and streaming potential. We also review the main strategies for surface coating, and compare the advantages of physisorption, well-organized thin self-assembled monolayers, or conversely thick polymer "brushes". Examples of existing applications to electrophoresis in microchannel are also given.

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Self-assembling monolayer silane films as adhesion promoters

Cited by 39 publications

References 23 publications

Simulation of the structure of organosilane film coatings

Simulation of the structure of organosilane film coatings

Novel Self-Assembling Silane for Abhesive and Adhesive Applications

Surface treatment and characterization: Perspectives to electrophoresis and lab‐on‐chips

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