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Химия Химия
Физическая химия Физическая химия

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New Optical Sensors for Determination of Corrosion in Reinforcement Concrete

Автор:   Pavel M.
мягкая обложка
224 страниц
2008 год
Издательство:   Книга по Требованию
Цена:
3231 руб
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Описание:The dyes have been covalent bound to poly(vinyl alcohol co ethylen) by acetal spacer bridge to assure long–term stability of the sensor. Optical sensoric materials were prepared, which allow a non-destructive monitoring of these processes. Principally, it is an electrochemical process, which can be divided by two mechanisms – acidic and chloride initiated corrosion. The response time of these sensors is in the range of seconds. An aldehyde group has been used as dye–reactive functionality for the first time. The colour change of such prepared pH–indicator materials occurs in the pH interval of 11 to 13 and allows to predict the acidic attack in an early stage. Corrosion of reinforcement steel of concrete is one of the main causes of deteriorations of structures. The optical detection of chloride ions in alkaline media has been investigated. Benzimidazolotrimethine dyes tend to form J–aggregates under influence of chloride ion concentration in pH of 10 to 13. A suitable polymer has been developed – poly(vinyl alcohol co vinyl butyral), in which the dye is dissolved as host–guest system. Such prepared sensor material allows a precise determination of chloride concentration and shows an excellent selectivity against other anions, which are typical in the presence of concrete structures. To the best of our knowledge it is the first optical sensors for determination of chloride in alkaline media. The sensors are embedded into concrete structures and the signal is transported through optical fibres. pH–indicator azo dyes have been synthesised for monitoring of acidic attack.


Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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The Ode Less Travelled: Unlocking The Poet Within

Our understanding of much in the world is more poetic than noetic. We let others do the work and take their half-understood ideas for a ride, all unaware of the cognitive principles that gave birth to them. That those principles and their corollaries would have shocked and perplexed us had we lived in other times is interesting but irrelevant for our purposes. You do not have to understand Faraday’s and Maxwell’s electromagnetic theories of light to operate a light switch, or even to become a professional lighting designer. The upshot of Imagism, Vorticism, Cubism, Neo-Plasticism, Constructivism, Acmeism, Futurism, Dadaism and all the other -isms that flooded art in the twentieth century was to allow a new kind of poetry, of which concrete poetry is one, the work of cummings another. Such practices now inform the works of thousands of poets around the globe. Since, unlike traditional metrical poetry, they descend from conscious ideas rather than techniques evolved (by way of music and dance) out of the collective unconscious of three millennia, their genesis did seem worth a small excursion ...»

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