Surface-bound carboxylic groups

Either laser-ablated PETG or hot-imprinted PETG followed by NaOH hydrolysis have produced surface-bound carboxylated groups, leading to enhanced EOF to similar extents. These groups can be further chemically modified to give amine moieties [421]. 

Scheme 4. Idealized sketches of gold surfaces for DNA hybridization sensors prepared by (a) chemisorption of thiolated ssDNA capture probes followed by chemisorption of a dilutor alkylthiol [168] and by (b) chemisorption of a mixed alkylthiol SAM followed by covalent attachment of an amino-terminated ssDNA capture probe (surface-bound carboxylic groups are activated by reaction with 0-(N-auccimrmdyl)-N,N,N, N -tetramethyluronium tetrafluoroborate in acetonitrile in the presence of N, A-diisopropylethylamine, [172]).

The adsorption of citric acid on the surface of the magnetite particles is proved in ATR-IR-spectroscopy experiments. Therefore the sample dispersion is precipitated several times in acetone to eliminate non-surface bound salts and dried in vacuum before measurement. The vibration absorption of protonated carboxylic acid groups of citric acid are found at 1743 cm whereas the deproto-nated surface bound carboxylate groups show a peak at 1561 cm Both values correspond to the literature [17]. 

Recently, surface-functionalized particles with covalently bound carboxyl groups were prepared using an ionic as well as a nonionic surfactant as templates to perform crystallization on the surface of the particles [101]. This approach of crystallization outside of the particle (Fig. 9a) is in contrast to a previous report [27], where the... 

The latex stability characteristics related to surface chemistry were analyzed by Polatajko-Lobos and Xanthopoulo [47] by studying the relationships between the concentration of surface-bound functional groups on carboxylated styrene-butadiene copolymer latex particles and the mechanical and chemical stability of the latexes synthesized. 

The living character of the ring opening metathesis polymerization described earlier in this review enables a simple preparation of functionalized norbornene-based monoliths. Adding one more in situ derivatization step that involves functional norborn-2-ene and 7-oxanorborn-2-ene monomers that react with the surface-bound initiator, the pores were provided with a number of typical functional groups such as carboxylic acid, tertiary amine, and cyclodextrin [58,59]. 

Since the (Fen05(0H)6> unit is stable, it has been speculated(8b,17b) that it might also be present in the ferritin core. Since the majority of phosphate in ferritin is adventitious, surface bound and the metallic core can be reconstituted in the absence of phosphate groups with no change in the X-ray powder diffraction pattem(l), replacement of bridging phosphate by bridging carboxylate groups should not influence the three dimensional structure of the core. Calculations show that -409 Fell nnits could fill the apoferritin inner cavity. Further details can be found in reference 17. 

Thus the monodisperse polystyrene latex stabilized with strong-acid surface groups can be hydrolyzed to form a latex stabilized with the same number of nonionic hydroxyl groups, which in turn can be oxidized to form a latex stabilized with the same number of weak-acid carboxyl groups, thus offering model colloids with identical characteristics except for the type of chemically bound surface groups ---- strong-acid, weak-acid, non-... 

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