Preparation of polystyrene brushes by reaction of terminal vinyl groups on silicon and silica surfaces

Maas, J.H. van der; Stuart, Martien A. Cohen; Sieval, Alexander B.; Zuilhof, Han; Sudhölter, Ernst J. R.

doi:10.1016/s0040-6090(03)00033-6

Cited by 50 publications

(49 citation statements)

References 17 publications

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“…Zhu et al [15] employed a two-step procedure to link the hydroxyl end-group of poly(ethylene oxide) molecules with an ether bond to a silicon surface. Using an even simpler method, Maas et al [16] linked vinyl-terminated polystyrene molecules to a silica surface by letting the vinyl groups react with the hydroxyl groups at a silica surface that appear as a result of the chemisorption of water to form ether bonds. Grafting densities, ¾ ¡1 , of 0.47 and 0.33 nm ¡2 were obtained using polystyrene of 2000 and 20 000 Da molar mass, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of poly(ethylene oxide) brushes on glass surfaces and adhesion of Staphylococcus epidermidis

Kaper

Busscher²,

Norde³

2003

Journal of Biomaterials Science, Polymer Edition

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Abstract-Poly(ethylene oxide) brushes have been covalently bound to glass surfaces and their presence was demonstrated by an increase in water contact angles from fully wettable on glass to advancing contact angles of 54 ± , with a hysteresis of 32 ± . In addition, electrophoretic mobilities of glass and brush-coated glass were determined using streaming potential measurements. The dependence of the electrophoretic mobilities on the ionic strength was analyzed in terms of a softlayer model, yielding an electrophoretic softness and xed charge density of the layer. Brush-coated glass could be distinguished from glass by a 2-3-fold decrease in xed charge density, while both surfaces were about equally soft. Adhesion of Staphylococcus epidermidis HBH276 to glass in a parallel plate ow chamber was extremely high and after 4 h, 19:0 £ 10 6 bacteria were adhering per cm 2 . In contrast, the organisms did not adhere to brush-coated glass, with numbers below the detection limit, i.e. 0:1 £ 10 6 per cm 2 . These results attest to the great potential of polymer brushes in preventing bacterial adhesion to surfaces.

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Section: Introductionmentioning

confidence: 99%

“…2), using the method described by Maas et al [16], and to assess the usefulness of the resulting brush in preventing initial bacterial adhesion as the onset of infection [1]. The grafted polymer layers were physico-chemically characterized by water contact angles and streaming potentials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of poly(ethylene oxide) brushes on glass surfaces and adhesion of Staphylococcus epidermidis

Kaper

Busscher²,

Norde³

2003

Journal of Biomaterials Science, Polymer Edition

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“…This is achieved using the methodology of Maas et al 37 with a solution containing a 9:1 mixture of the Mw 1,700…”

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confidence: 99%

Switching the Interpenetration of Confined Asymmetric Polymer Brushes

et al. 2016

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The interpenetration of two polymer brushes on approaching flat surfaces has been investigated. When compacting polymer brushes with an asymmetric charge on each surface, one neutral and the other weakly charged, we find that the brush interpenetration becomes a parameter that can be controlled by the pH of the hydrating solution. The switching between high and low degrees of brush interpenetration was investigated with numerical selfconsistent field theory (nSCF) and experimentally using a sample environment which combines neutron reflectometry with a surface force type apparatus. Initially, a pair of uncharged poly(ethylene oxide), PEO, brushes are examined, where one of the brushes is 2 deuterated to distinguish it from a hydrogenous counter-part. We find in both nSCF and these experiments that there is no significant overlap between the brushes as both compact into polymer blocks with little hydration. However, when a weak polyelectrolyte poly(2-(dimethylamino)ethyl methacrylate), PDMAEMA, brush is confined against a deuterated neutral PEO brush and the pH of the hydrating solution is below the polycation's pKa of 7.5, then the presence of charged groups on the PDMAEMA allows significant interpenetration to occur between the two polymer brushes on contact. This interpenetration remains once the polymer brushes dehydrate due to the confining pressure that is applied. Raising the pH to a value above the pKa, removes the charges from the polyelectrolyte brush resulting in little to no interpenetration between the two brushes. Therefore, by simply adjusting the pH of the hydrating solution the interpenetration state between polymer brush pairs can be switched when one brush is a weak polyelectrolyte. Since polymer brushes are widely investigated and used to reduce friction between solid surfaces, this effect may have significant implications in the design and operation of polymer brushes with controllable friction properties.

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“…The surface functionnalisation of the objects or of the grippers can be obtained by different methods. The two more important methods are the physisorption of polyelectrolyte (polyelectrolyte with positive or negative charges) [14] or the grafting of molecules on the surface (covalent bound between the substrate and the molecules) [15,16,17] in order to form a self-assemble monolayers.This phenomenon is mainly due to two processes depending of the instrinsic atomic compositions of the substrates: Oxydized substrates are useful for silane functionalisation whereas gold substrates are only reactive with sulfhydrils compounds. The difference in reactivity could be a real advantage in our approach because the using of silane (or thiol) molecules will allow a vectorization of the chemical processes.…”

Section: Introductionmentioning

confidence: 99%

“…The second method generates covalent bound between substrate and molecules. These molecules must contain silanol, thiol, azide, allyl or vinyl groups [15,16] in an extremity. These molecules have to be used in organic solvent as toluene, acetone, methanol, ethanol, ...…”

Section: Introductionmentioning

confidence: 99%

Reduction of a micro-object's adhesion using chemical functionalisation

Dejeu

Rougeot

Gauthier

et al. 2009

Micro &Amp; Nano Letters

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The adhesion and interaction properties of functionalised surfaces (substrate or cantilever) were investigated by means of atomic force microscope (AFM) related force measurements. The surfaces were functionalised with a polyelectrolyte: Poly(Allylamine Hydrochloride) (PAH), or with silanes: 3 (ethoxydimethylsilyl) propyl amine (APTES) or (3 aminopropyl) triethoxysilane (APDMES). Measurements of forces acting between a bare glass sphere (functionalised or not) and a functionalised surface indicated repulsive or attractive forces, depending on functionnalisation and medium (wet or dry). Adhesion forces (pull-off) can be observed in dry medium while in wet medium, this phenomenon can be cancelled. Now, the pull-off forces is an important problem in the automation of micro-object manipulations. The cancellation of this force by chemical functionnalisation is thus a promising way to improve micro-assembly in the future.

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Preparation of polystyrene brushes by reaction of terminal vinyl groups on silicon and silica surfaces

Cited by 50 publications

References 17 publications

Characterization of poly(ethylene oxide) brushes on glass surfaces and adhesion of Staphylococcus epidermidis

Characterization of poly(ethylene oxide) brushes on glass surfaces and adhesion of Staphylococcus epidermidis

Switching the Interpenetration of Confined Asymmetric Polymer Brushes

Reduction of a micro-object's adhesion using chemical functionalisation

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