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Molecular mobility and transitions in complex organic systems studied by shear force microscopy

Tomoko Gray1, Jason Killgore1, Jingdong Luo2, Alex K Y Jen2 and René M Overney1,3

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In this paper, we discuss novel nanoscale experimental approaches involving shear forces to investigate inter- and intramolecular mobilities, and their effect on mass and electronic transport, and material deformation properties. We review the non-scanning method of shear modulation force microscopy (SM-FM) used for glass transition analysis, and introduce heated tip atomic force microscopy (HT-AFM) for thermomechanical analysis of material interfaces. The dynamics and kinetics in organic thin films that are typically revealed by the activation energies related to molecular relaxations are determined with intrinsic friction analysis (IFA). Both SM-FM and IFA are applied to optimize the poling efficiency of organic non-linear optical materials involving chromophores, used for photonic devices. They also provide information about intramolecular relaxation properties. A shear force analysis involving HT-AFM was used to investigate the interfacial strength of silica nanoparticles and poly(trimethylsilylpropyne), which are known to form a reverse-selective membrane nanocomposite system.


PACS

73.63.-b Electronic transport in nanoscale materials and structures

81.40.Gh Other heat and thermomechanical treatments

68.37.Ps Atomic force microscopy (AFM)

61.46.-w Structure of nanoscale materials

62.25.-g Mechanical properties of nanoscale systems

64.70.P- Glass transitions of specific systems

Subjects

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 4 (31 January 2007)

Received 15 August 2006, in final form 2 November 2006

Published 12 December 2006



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