Self-assembling silane

Plasma treatment of PDMS followed by adsorption of self-assembled silane monolayers has enabled us to controllably modify the surface energy of elastomer surfaces as described in the section on the Johnson, Kendall, and Roberts approach to deriving the surface free energy of solids. A similar treatment of silicon substrates has produced a useful, low—hysteresis model substrate for contact angle study. There are three types of PDMS contact angle substrates usually studied fluids baked or otherwise chemisorbed on solids such as glass or metals cross-linked coatings on flexible substrates, such as paper or plastic film PDMS elastomer surfaces. 

An ideal substrate would be smooth, rigid (i.e. a polished metal), coated with an ultra-thin PDMS layer anchored by a well-understood and controllable chemistry. This has been achieved by taking semi-conductor silicon wafers which have a thin oxidized silica layer which can be treated by a self-assembling silane monolayer, such as vinyl terminated alkyltrichlorosilane. This can then be reacted with SiH-containing PDMS this hydrosilylation reaction is well-understood and the random substitution of such SiH groups along a PDMS chain has been well established by NMR studies. The low hysteresis surface that can be obtained in this manner is illustrated by the data in Table 4. 

The formation of the self-assembled silane coating occurs according to a number of steps, among which the most important are [37] ... 

Haensch C, Hoeppener S, Schubert US (2010) Chemical modification of self-assembled silane based monolayers by surface reactions. Chem Soc Rev 39 2323-2334... 

Lee, I. and Wool, R.P., Controlling amine receptor group density on aluminum oxide surfaces by mixed silane self-assembly. J. Thin Solid Films, 379, 94 (2000). 

Luderer F, Walschus U (2005) Immobilization of Oligonucleotides for Biochemical Sensing by Self-Assembled Monolayers Thiol-Organic Bonding on Gold and Silanization on Silica Surfaces. 260 37-56... 

Zhong X, Yuan R, Chai Y, Liu Y, Dai J, Tang D (2005) Glucose biosensor based on self-assembled gold nanoparticles and double-layer 2d-network (3-mercaptopropyl)-trimethoxy-silane polymer onto gold substrate. Sensor Actuator B 104 191-198... 

The nse of self-assembled monolayers of proteins by direct chemical attachment of the peptide to a modified snrface obviates some of the protein orientation difficnlties observed in the construction of LB mono-layers. An initial report of the construction of peptide SAMs on silanized qnartz was pnblished in early 1998 (185). Pilloud et al. have utilized the covalent ligation of protein cysteine thiols to thiol-terminated silanized... 

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