‘The Schuler Pendulum and Inertial Navigation‘

Lee, J. A.

doi:10.1017/s0373463300025479

J. Navigation

1969

DOI: 10.1017/s0373463300025479

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‘The Schuler Pendulum and Inertial Navigation‘

J. A. Lee¹

Abstract: Mr. Bell and Professor Stratton have in the October Journal shed interesting light on the nature of inertial navigation as applied to navigation around a planet. It is a pity that Mr. Bell has repeated that in such inertial systems vehicle position and velocity are deduced from measurement of acceleration. This idea is certainly misleading so far as understanding error propagation in these systems is concerned, if not actually wrong.

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1984

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Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes

Duonghong

Serpone

Gräetzel

1984

Helvetica Chimica Acta

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Irradiation of acidic (pH 2) solutions of RuLb+ 2C1-(L = diisopropyl 2,2'-bipyridine-4,4'-dicarboxylate) in the presence of TiO, at 100°C leads to the loss of one bipyridyl ligand and the chemical fixation of RuL, at the surface of the TiO, particles through formation of Ru-0-Ti bonds. These surface complexes are very stable and shift the absorption onset of TiO, beyond 600 nm. Efficient sensitization of H,-generation is achieved with this system beginning in the wavelength domain between 590 and 665 nm. Preliminary water cleavage experiments with the bifunctional TiO,/Pt/RuO, redox catalyst are reported.Introduction. -Spectral sensitization of large band-gap semiconductors is widely applied in silver halide [l] and electrophotography [2]. Optimum results are achieved with systems where intimate contact between dye and semiconductor is established. Thus, in the case of ZnO, a successful strategy for sensitization, applied in patents by Ada-Gevaert [3] and Lee [4] and established through the pioneering work of Zollinger et al. [5] and Haufle [6], consists of the chelation of Zn2+ ions at the particle surface by suitable chromophores. Surface modification of semiconductors such as TiO, and SnO, by adsorbed or covalently linked photoactive dyes is also a subject of increasing investigation [7-91 in view of the potential applications to solar energy conversion. In both photoelectrochemical cells [7] and H,-generating photochemical systems [8] (91, the phenomenon of photosensitized electron injection is used to effect charge separation with light of less than band-gap energy. Very interesting in this regard is our recent observation [9] that complexation of Ti4+ by 8-hydroxyquinoline on the surface of TiO, leads to in situ formation of an efficient sensitizer for H, generation by visible light. A drawback of the latter system, making necessary the use of sacrificial electron donors, is the inability of the oxidized sensitizer to produce oxygen from water. Here, we report on a new method for surface derivatization of TiO, by a more suitable chromophore which, we believe, should be of great importance for the design of reliable catalytic systems affording water cleavage by visible light with no assistance from sacrificial donors or acceptors.

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Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes

Duonghong

Serpone

Gräetzel

1984

Helvetica Chimica Acta

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show abstract

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‘The Schuler Pendulum and Inertial Navigation‘

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Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes

Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes

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‘The Schuler Pendulum and Inertial Navigation‘

Cited by 1 publication

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Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO2 Particles by Surface Derivatization with Ruthenium Complexes

Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO2 Particles by Surface Derivatization with Ruthenium Complexes

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Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes

Integrated Systems for Water Cleavage by Visible Light; Sensitization of TiO₂ Particles by Surface Derivatization with Ruthenium Complexes