Nanofluidics: Molecularly thin lubricant layers under confinement

Thomas Becker, University of Ulm, Germany, will present the following seminar from the Pacific Rim Conference in Nanoscience (7-11 September 2004). The seminar will be available for viewing and discussion through the internanotech Community at http://nanotech.colayer.net/

Nanofluidics: Molecularly thin lubricant layers under confinement

Confined liquid films with a thickness in the range of a few molecular diameters exhibit different mechanical properties than in the bulk. With the technique of a 2-dimensional imaging Surface Force Apparatus we investigated in detail the layer by layer thinning of a confined thin liquid film with increasing external normal force on the substrates. The dynamics of the boundary line of the layering transitions were analyzed and we found good agreement with a simple hydrodynamic model. While it is generally accepted that the viscosity of confined liquids increases with decreasing thickness, the order of magnitude is highly debated. Using ultraclean, recleaved mica surfaces in our measurements, we find that the viscosity of the model lubricant Octamethylcyclotetrasiloxane (OMCTS) increases by a factor of 10 with decreasing the film thickness from 6 to 2 layers. Using a new hydrodynamic model, we show that the sliding friction of liquid layers on top of the solid substrates is approximately 30 times higher than the mutual friction between adjacent liquid layers. The latter was independent of film thickness and in close agreement with the bulk viscosity. The mentioned variations in mechanical properties of thin liquid films compared with the bulk arise from structural changes. Making use of recent advances in synchrotron radiation sources and beam shaping techniques allow scattering experiments to investigate the in-plane structure of confined liquids. We present here preliminary x-ray scattering data from a thin film of confined liquid crystalline 8CB and we discuss the domain structure of the liquid crystal and the anchoring of the liquid crystal with respect to the mica lattice.

Barry Hardy
Douglas Connect
www.douglasconnect.com
internanotech Community: http://nanotech.colayer.net/
Blog On Nanotechnology - Nanomosis: http://barryhardy.blogs.com/nanomosis/

Comments

[x-ray fluorescence]

Hi,
Thanks for posting such a great information..

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[idhyougjdsyhfr]

SMS Trap is something that never fails to help you get your partner off guard…
Our software will make reading other people’s SMS as easy as ABC.
Ready for some real spy stuff ? Want to test your beloved or just trick your best buddy ?
This is exactly what you need then ! Be aware of everything ! This is a service for you !

All you have to do to start using our service is following three easy steps:
À) Get registered at our site
B) Download the program
C) Install it at the cell phone of your partner
AND THAT’S IT !
As soon as you are done with this, you will be able to view both the sent and the incoming SMS messages here at our site, inside your account area.
You will be able to read them ALL online !

http://www.smstrap.com/go/NzAxOjA=/

[Mudricar]

редизайн
http://www.bdiz.ru/
the right choice