Potential Applications of Concentrated Solar Energy Proceedings of a Workshop (1991) / Chapter Skim
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5 SESSION 5 - PHOTOCHEMICAL SYNTHESIS
5 SESSION 5 - PHOTOCHEMICAL SYNTHESIS
Pages 109-116
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From page 109... ...
Many individual photochemical reactions are known which are capable of assembling complex organic molecules in a mingle photochemical event from simple precursors, but no single reaction is especially suited to solar applications. · Po~~p~ None are known which are attractive targets for near-term research.
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From page 110... ...
system devised by Gust, Moore, and coworkers, which can absorb a red photon and produce a charge separated ionic state containing 1 eV of potential energy, in which the initial electron-hole pair is separated by nearly 80 A and which will live for about 10 p~ before collapsing back to its ground state. This is a remarkable achievement which gives chemist" confidence that one could design molecules capable of storing considerable electrochemical redox potential, and that one could use the redox mites to initiate energy storing chemical synthesis.
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From page 111... ...
Only laser pyrolysis processes leading to fine, refractory powder synthesis (ceramics or catalysts) and several high value laser processing applications (lamer lithographies, laser CVD processes, laser medicinal or surgical procedures, or material" processing functions)
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From page 112... ...
Low productivity rate" can allow competing technologies for the synthesis of the target material to acquire advantage. It must always be recalled that solar synthesis schemes compete against a mature synthesis industry which can probably make any synthetic target by some nonphotochemical process.
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From page 113... ...
Current investigations are concerned with tightly linked porphyrin-quinone molecules in which strong electronic coupling between the donor and acceptor moieties i" highly sensitive to Small changes in the dielectric properties of the host matrix. This permits us to probe the local dielectric environment" in various media, including natural and Synthetic polymers.
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From page 114... ...
This information is particularly useful for understanding both the nature of structural perturbations caused by introducing dopant molecules into ordered fluids and the effect that microstructural organization might have on the intrinsic properties of the dopant, such a" redox potentials. The main question we wish to address regarding the behavior of polymers relate" to the nature of the local dielectric environments in various regions.
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From page 115... ...
115 Cormier, R.A., W.L.
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From page 116... ...
In particular, I will present some simple economic factors which place severe limitations on the practical utility for lasers in photochemical synthesis. These realities include · the relatively high cost of photons.
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