Tools to Probe Nanoscale Surface Phenomena in Cellulose Thin Films: Applications in the Area of Adsorption and Friction - The Nanoscience and Technology of Renewable Biomaterials - page 116

modification of the surface of cellulose thin films via adsorption of polyampholytes and
nonionic polymers. These techniques allow the determination of fundamental informa-
tion, relevant to lubrication phenomena including (1) affinity of adsorbing molecules to
the substrate, (2) viscoelasticity of adsorbed layers, (3) kinetics of adsorption and des-
orption, and (4) thickness of the adsorbed layer as well as the amount of coupled water
in adsorbed films. LFM was presented as a useful tool to directly measure friction on
polymeric surfaces. LFM complements results from the adsorption tests as LFM allows
us to quantify the extent of the adsorption as well as the conformation of adsorbed lay-
ers. Based on information provided via LFM, SPR and QCM, a better understanding of
friction phenomena on cellulosic systems can be achieved. By correlating the structure
and lubricant effect of adsorbates, novel formulations with superior performance can be
tailored. In return one can significantly improve the efficiency of cellulose fiber and
textile processing and improve the quality of products being manufactured.
Overall, it is concluded that a fundamental understanding of adsorption and friction
behavior can unveil a more complete understanding about boundary lubrication and
nanostructuring phenomena on cellulose systems.

Acknowledgements

Funding supported from the National Textile Center under the Grant number C05-NS09
and the National Research Initiative of the USDA Cooperative State Research, Education
and Extension Service, grant number 2007-35504-18290 is gratefully acknowledged.
Dr Tom Theyson, from Goulston Corp. is acknowledged for his advice and suggestions.

References

Akagaki, T. and K. Kato (1988) Simulation of flow wear in boundary lubrication using
a Vickers indentation method. Tribology Transactions 31 (3): 311-16.
Bailey, L.E., D. Kambhampati, et al . (2002) Using surface plasmon resonance and the
quartz crystal microbalance to monitor in situ the interfacial behavior of thin organic
films. Langmuir 18 (2): 479-89.
Bailey, L.E., K.K. Kanazawa, et al . (2001) Multistep adsorption of perfluoropolyether
hard-disk lubricants onto amorphous carbon substrates from solution. Langmuir

17 (26): 8145-55.
Behary, N., A. Ghenaim, et al . (2000) Tribological analysis of glass fibers using atomic
force microscopy (AFM)/lateral force microscopy (LFM). Journal of Applied Polymer
Science 75 (8): 1013-25.
Bogdanovic, G., F. Tiberg, et al . (2001) Sliding friction between cellulose and silica
surfaces. Langmuir 17 (19): 5911-16.
Bratko, D. and A.K. Chakraborty (1996) A numerical study of polyampholyte configu-
ration. Journal of Physical Chemistry 100 (4): 1164-73.
Breakspear, S., J.R. Smith, et al .

(2003) AFM in surface finishing: Part III. Lateral

force microscopy and friction measurements. Transactions of the Institute of Metal

Finishing 81 : B68-B70.