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Surface derivatization

Steigerwald M Let al 1988 Surface derivatization and isolation of semiconductor cluster molecules J. Am. Chem. Soc. 110 3046... [Pg.2915]

The historical development of chemically electrodes is briefly outlined. Following recent trends, the manufacturing of modified electrodes is reviewed with emphasis on the more recent methods of electrochemical polymerization and on new ion exchanging materials. Surface derivatized electrodes are not treated in detail. The catalysis of electrochemical reactions is treated from the view of theory and of practical application. Promising experimental results are given in detail. Finally, recent advances of chemically modified electrodes in sensor techniques and in the construction of molecular electronics are given. [Pg.50]

From this discussion it is clear, that, independently of their redox properties, suitably modified electrodes offer themselves for the introduction of diastereo- or enantioselectivity into electrochemistry. Early reports of chiral inductions at modified electrodes include reactions at graphite and SnO surfaces derivatized with monolayers of (S)-(—)-phenylalanine. Asymmetric inductions at the chiral graphite electrode could, however, not be verified in other laboratories even after great efforts... [Pg.73]

Monolithic silica columns with various surface derivatization, including ion exchange (Xie et al., 2005), and chiral functionalities (Chen et al., 2002 Lubda et al., 2003 Chankvetadze et al., 2004), as well as protein-immobilized monoliths (Kato et al., 2005) have been reported. The latter will be an important part of an integrated multidimensional separation/identification system. [Pg.158]

The ability to efficiently reduce MV2+ to MV+ at illuminate p-type Si led to studies of the surface derivatizing reagent III... [Pg.76]

Additional background literature can be found in textbooks on HPLC or specifically on HPLC columns.For further information on surface derivatization and column chemistry in general. Reference 6 or 7 is recommended. [Pg.78]

Alternatively, monolith-supported second generation Crubbs catalysts containing unsaturated (e.g. IMes) or saturated (e.g. SIMes) NHCs [5] can be prepared by a synthetic protocol summarized in Scheme 8.9. Surface-derivatization of a monolith was carried out with 7-oxanorborn-2-enedicarboxylic anhydride followed by conversion of the grafted poly(anhydride) into the corresponding poly-silver salt. [Pg.365]

In an effort to confront these deficiencies, we have developed a procedure for the surface derivatization of small glass (sol-gel) [41] pellets and applied it to the synthesis of supported Ru catalysts [42]. As shown in Scheme 11.8, the Unker and the active metal carbene were installed in a sin e step. Treatment of (71) with allylchlorodi-methylsilane and a full equivalent of (4,5-dihydroIMES)PCy3Cl2Ru=CHPh (29) led to rapid ROCM and metaUation of the styrenyl ether (-> 72). Preweighed monolithic (smallest dimension > 1 mm) sol-gels were then added to the solution, and substi-... [Pg.489]

Surface modification can be achieved by the surface derivatization of functional-group-bearing low-molecular-weight substances, the grafting of polymer to and from the surface and amphiphilic polymer coating. The main theme of this article is focused on initiator-transfer-terminator (iniferter)-based grafting-from-surface and derivatization-on-surface approaches aiming at precision surface architectures, which are primary determinants of the biocompatibility of medical devices. [Pg.69]

Third, a newly developed iniferter-based surface derivatization based on cross-recombination reaction is demonstrated. [Pg.70]

Steigerwald ML, Alivisatos AP, Gibson JM, Harris TD, Kortan R, Muller AJ, Thayer AM, DimcanTM, Douglass DC, Brus LE (1988) Surface Derivatization and Isolation of Semiconductor Cluster Molecules. J Am Chem Soc 110 3046-3050... [Pg.231]

A higher level of size and morphology control in the incipient semiconductors has been accomplished in reversed micelles prepared from cadmium AOT [614] and from mixtures of cadmium AOT and sodium AOT [615] or, alternatively, by arresting particle growth by surface derivatization [592, 621, 622]. Indeed, surface derivatization of semiconductor clusters was first reported for particles in reversed micelles [621] the reversed micelles act to confine precursor ions and to control the growth of the semiconductor particles. Conditions are typically arranged so that, initially, there is no more than one metal ion (say Cd2+) per water pool. Addition of a heptane solution of bis(trimethylsilyl) selenium resulted in the formation of size-quantized metal selenide particles (say CdSe) in the reversed micelles. This solution could be evaporated to dryness and the resultant particles could be reconstituted in a hydrocarbon solvent Alternatively, addition of metal (say Cd2+) ions to the reversed-micelle-entrapped metal selenide particles, followed by the addition of alkyl(trimethylsilyl)selenium, RMSiMe3, led to the formation of alkyl-capped... [Pg.127]

S. S. Prakash, C. J. Brinker, A. J. Hurd, and S. M. Rao, Silica aerogel films prepared at ambient pressure by using surface derivatization to induce reversible drying shrinkage. Nature (London) 374, 439-443 (1995). [Pg.428]

A practical problem with n-type semiconductors is that photoanodic oxidation can quickly render the system useless surface derivatization was seen as a way round the problem. A range of silanated ferrocenes was used to derivatize silicon electrodes with a remarkable increase in the stability of the photocurrent as a function of time.100 Illumination causes the oxidation of surface bound ferrocene which, in turn, oxidizes a redox species such as [Fe(CN)6]4 in solution. [Pg.30]

Tiller JC, Lee SB, Lewis K et al. (2002) Polymer surfaces derivatized with poly(vinyl-(V-hexylpyridinium) kill airborne and waterborne bacteria. Biotechnol Bioeng 79 465—471... [Pg.213]

Dung DH, Serpone N, Gratzel M (1984) Integrated systems for water cleavage by visible-light - sensitization of TiCL particles by surface derivatization with ruthenium complexes. Helv Chim Acta 67 1012-1018... [Pg.216]

Electrode surface derivatization with Id and 4a. In a typical experiment, Au or Pt electrodes of the appropriate size were soaked in a 0.1 mM hexane solution of Id for 24 h. Cyclic voltammetry in CH2C12/Bu4NPF6 solution indicated monolayer coverage (4-8 x 10 10) of Id as did specular reflectance FTIR spectroscopy. The Id treated electrodes were then soaked in a 0.1 M hexane solution of 4a for 15 min. Cyclic voltammetry in CH2C12/Bu4NPF6 indicated that the monolayer formed in this manner consisted of approximately 1 1 ld 4a. [Pg.239]

Shvarts, R. V. Ussyshkin, R. Naaman, A. Shanzer, and D. Cahen, Novel NO biosensor based on the surface derivatization of GaAs by hinged iron porphyrins , Angewandte Chemie — International Edition 39, 4496 (2000). [Pg.419]


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See also in sourсe #XX -- [ Pg.173 ]

See also in sourсe #XX -- [ Pg.308 ]




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