Surface modifiers phosphates

Allcock, H. R., and Kwon, S., Covalent linkage of proteins to surface-modified poly(organophosphazenes) Immobilization of glucose-6-phosphate dehydrogenase and trypsin, Macromolecules. 19, 1502, 1986. 

Surface modifiers Anti stats Ethoxylated amines and quaternary ammonium salts, phosphate esters, glycerides... 

Fig. 14.28. Cyclic voltammograms of 100 n/W horse heart cytochrome cat an Au(110) surface modified with 4,4 -PySSPy, 2,2 -PySSPy, and diphenyl disulfide (PhSSPh) in a 0.1 M phosphate buffer solution containing 0.1 M NaCI04 (pH 7) at 25 °C. Scan rate 50 mV/s. (Reprinted from I. Taniguchi, Probing Metalloproteins and Bioelec-trochemical Systems, Interfacial 6(4) 34-37, Fig. 3, 1997. Reproduced by permission of the Electrochemical Society, Inc.)...

Fig. 1.1. (a) SPR angle shifts (A pi) showing the electrostatical adsorption of cytochrome-c on gold electrode surfaces modified with a 3-mercaptopropionic acid SAM (I) after addition of cytochrome-c to a final concentration of ca. 2.5 x 10 M in 5 mM Na-phosphate pH 7.0 (full fine) or in 5 mM Na-phosphate, 100 mM KCl pH 7.0 (dotted line) (11) after rinsing the surface with clean buffer solution, (b) Cyclic voltammograms of a monolayer of cytochrome-c adsorbed on a gold electrode modified with a 3-mercaptopropionic add SAM recorded in 5 mM Na-phosphate, pH 7.0, at 50, 100 and 200 mV s. Reproduced fix)m [214] with permission. 

Varma, H.K., Sreenivasan, K., Yokogawa, Y., and Hosumi, A. (2003) In vitro calcium phosphate growth over surface modified PMMA film. Biomaterials, 24 (2), 297-303. 

A. Kalendova, D. Vesely, J. Stejskal, andM. Trehova, Anticorrosion properties of inorganic pigments surface-modified with a polyaniline phosphate layer. Prog. Org. Coatings, 63, 209-221 (2008). 

A report in the same line [380] involves suspension of ZnS.Mn nanoparticles in microemulsions, with the surface modified by polyoxyethylene(l)laurylether phosphoric acid or polyoxyethylene(4.5)laurylether acetic acid. The coated particles exhibited several times higher photoluminescence intensity and quantum efficiency compared to the uncoated ones. The phosphate group P = O or the carboxyl group C = O, with their luminescent centers, were functional in this improvement, thus opening new routes for imparting superior optical properties on microemulsion-synthesized particles. Gan etaL [376] used four routes for the synthesis of ZnS Mn (i) the relatively new route that involved hydrothermal... 

In recent years, lamellar nanofiUers have been established as the most important filler type for barrier and mechanical reinforcement. Dal Point et al. reported a novel nanocomposite series based on styrene-butadiene rubber (SBR latex) and alpha-zirconium phosphate (a-ZrP) lamellar nanofiUers. The use of surface modified nanofiUers improvement the mechanical properties. However, no modification of the gas barrier properties is observed. The addition of bis(triethoxysilylpropyl) tetrasulfide (TESPT) as coupUng agent in the system is discussed on the nanofiUer dispersion state and on the fiUer-matrix inteifacial bonding. Simultaneous use of modified nanofillers and TESPT coupling agent is found out with extraordinary reinforcing effects on both mechanical and gas barrier properties [123]. 

A wide range of such surface modifiers are offered and used commercially, ranging from the inexpensive fatty acids, to silanes, titanates and zirconates and all are discussed. Reference is also made to non-commercial treatments, such as borates and phosphates. 

---