РОССИЙСКАЯ АКАДЕМИЯ НАУК

УРАЛЬСКОЕ ОТДЕЛЕНИЕ

ИНСТИТУТ ХИМИИ TBEPДОГО ТЕЛА
   
| | | |
| | | |
 10.10.2007   Карта сайта     Language По-русски По-английски
Новые материалы
Экология
Электротехника и обработка материалов
Медицина
Статистика публикаци


10.10.2007



A photoelectrochemical ruler



09 October 2007



Scientists working in Spain and the UK have developed a photoelectrochemical sensor that can be used to measure micron-sized objects, and could lead to a faster, more cost-effective tool compared to conventional microscopy.


A schematic of the self-contained 'photoelectrochemical ruler'


Richard Compton and his colleagues from Oxford University, UK, and the Centro National de Microelectrónica in Barcelona, Spain, used a net of microelectrodes in a transparent cell to make a self-contained 'photoelectrochemical ruler'. Compton said 'Electrochemistry has long concerned itself with the temporal measurements, such as rates of diffusion and lifetimes of intermediates, but the scope for probing spatial domains in solution has only recently been realised. The question arose as to whether this approach can be used for sizing objects without the need for them to be submerged in solution.' As a test system, Compton used the ruler to measure the thickness of a series of wires.


The wire was placed above the ruler and illuminated from behind, casting a shadow on the array of electrodes. The transparent cell forming the ruler contained a solution that stimulates an electrochemical current only in the presence of light. Compton explained 'The level of the photocurrent decreases with increasing diameter of the wire, as the photochemical reaction is not taking place at the parts of the electrode array that are covered by its shadow.'



"We are confident that this concept can be expanded to measure smaller objects if the width of the micobands and the separating surfaces are adjusted accordingly"
- Richard G. Compton, Oxford University, UK

By comparing the photocurrent with and without the presence of the wire, its dimensions can be determined readily from the known array spacing. The photoelectrochemical ruler has measured microwires down to 50 µm in diameter.


'Although this seems to be just a basic idea rather than an invention (it could) be of interest from fundamental point of view,' said Ali Eftekhari of Avicenna Institute of Technology, Ohio, US, 'as photoelectrochemical processes can be used for the measurement of physical scales.' Compton concluded 'We are confident that this concept can be expanded to measure smaller objects if the width of the micobands and the separating surfaces are adjusted accordingly.' Isis Innovation, the IP transfer company associated with Oxford University, has applied for a patent on this work and is actively seeking collaborators to commercialise the work.


Michael Spencelayh



Новости  


Требуются на работу в институте: - ведущий инженер с высшим химическим образованием.


Обращаться в отдел кадров института: 362-35-97.



Дизайн и программирование N-Studio 
А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

  • © 2004-2018 ИХТТ УрО РАН
    беременность, мода, красота, здоровье, диеты, женский журнал, здоровье детей, здоровье ребенка, красота и здоровье, жизнь и здоровье, секреты красоты, воспитание ребенка рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок медицина, клиники и больницы, болезни, врач, лечение, доктор, наркология, спид, вич, алкоголизм православные знакомства, православный сайт творчeства, православные рассказы, плохие мысли, православные психологи рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок