Molecular Conformation and Application of Stereoregular PMMA Langmuir-Blodgett Films

Kim, Jang-Joo Kim; Jung, Sang-Don; Hwang, Won-Young

doi:10.4218/etrij.96.0196.0037

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…In polar polymers, the situation can be much more complicated and the apparent surface potential of polymer molecules has to be discussed in connection with macroscopic Kelvin probe studies of thin PMMA films. These studies revealed that surface potential of PMMA films depends on the stereoregularity and molecular conformations of this polymer [ 21 ]. Therefore, PMMA domains and blocks in multi-component polymer materials might exhibit a specific surface potential that can be examined with KFM.…”

Section: Resultsmentioning

confidence: 99%

Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials

Magonov¹,

Alexander²

2011

Beilstein J. Nanotechnol.

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SummaryWe demonstrate that single-pass Kelvin force microscopy (KFM) and capacitance gradient (dC/dZ) measurements with force gradient detection of tip–sample electrostatic interactions can be performed in the intermittent contact regime in different environments. Such combination provides sensitive detection of the surface potential and capacitance gradient with nanometer-scale spatial resolution as it was verified on self-assemblies of fluoroalkanes and a metal alloy. The KFM and dC/dZ applications to several heterogeneous polymer materials demonstrate the compositional mapping of these samples in dry and humid air as well as in organic vapors. In situ imaging in different environments facilitates recognition of the constituents of multi-component polymer systems due to selective swelling of components.

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Section: Resultsmentioning

confidence: 99%

Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials

Magonov¹,

Alexander²

2011

Beilstein J. Nanotechnol.

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“…In expansion of the range of polymer materials that can be examined with KFM, we consider acrylic polymers. Macroscopic Kelvin probe studies of thin PMMA films revealed that their surface potential depends on stereoregularity and molecular conformations of this polymer (Kim et al, 1996). Therefore, surface PMMA domains and blocks in multicomponent polymer materials might exhibit a specific surface potential.…”

Section: Resultsmentioning

confidence: 99%

Multifrequency Atomic Force Microscopy: Compositional Imaging with Electrostatic Force Measurements

Magonov

Alexander

2011

Microsc Microanal

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We demonstrate that single-pass Kelvin force microscopy (KFM) and dC/dz measurements in different environments expand the compositional imaging with atomic force microscopy. The KFM and dC/dz studies were performed in the intermittent contact mode with force gradient detection of tip-sample electrostatic interactions. Both factors contribute to sensitive measurements of the surface potential and capacitance gradient with nanometer-scale spatial resolution as it was verified on a broad range of materials: metal alloys, polymers, organic layers, and liquid-like objects. For many samples the surface potential and dC/dz variations complement each other in identification of individual components of heterogeneous materials. In situ imaging in different humidity or vapors of various organic solvents further facilitate recognition of the constituents of multicomponent polymer samples due to selective swelling of components.

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“…It means that interaction between azobenzene molecules occur. At the same time, some interaction between azobenzene derivative and s-PMMA polymer (the dipole moment is of 0.17 D [9]) takes place too. As the example, in Fig.…”

Section: Estimation Of the Photoisomerization Kineticsmentioning

confidence: 99%

Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

Gustina¹,

Markava²,

Laizane³

et al. 2011

Latvian Journal of Chemistry

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We have synthesized and investigated a number of new type of the azobenzene derivatives containing alkoxycarboxylic group and N-substituted sulfonamide moiety at the opposite end of the molecule. The influence of the end group substituents on the reversible trans/cis photoisomerization process has been investigated. The photoisomerization process of studied azobenzene derivatives dominates both in chloroform solution and in PMMA polymer host-guest films. The values of the densities are reversible on alternate irradiation at absorbance maxima of trans-(450 nm) and cis-isomers (360 nm).The fastest trans/cis photoisomerization process is observed both in solution and the host-guest film of the azobenzene derivative containing two cyclohexyl groups in the N-substituted sulfonamide moiety. This azobenzene derivative is promising for further studies of the photoinduced mechanic properties like surface relief gratings.

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Molecular Conformation and Application of Stereoregular PMMA Langmuir-Blodgett Films

Cited by 12 publications

References 19 publications

Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials

Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials

Multifrequency Atomic Force Microscopy: Compositional Imaging with Electrostatic Force Measurements

Synthesis and Investigation of Photoisomerization of Some New Azobenzene Carboxylic Acids

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