Peculiar ‘Reptational’ Movements of Single Synthetic Polymer Chains on Substrate Observed by AFM

Kumaki, Jiro; Kawauchi, Takehiro; Yashima, Eiji

doi:10.1002/marc.200700725

Cited by 13 publications

(13 citation statements)

References 46 publications

(12 reference statements)

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“…In previously described systems with reptational movements the obstacles were distributed randomly. [27][28][29] In contrast, molecular lamellas on graphite have a linear geometry and well dened symmetry, which causes the observed peculiarities of DNA movement on molecular nanotemplates on graphite.…”

Section: Resultsmentioning

confidence: 99%

“…25 One of the main advantages of this method is the possibility to study the dynamics of adsorbed DNA molecules in solutions. [26][27][28][29] The purpose of this work was to achieve deeper understanding of controlled DNA immobilization, assembly and organization on molecular nanotemplates of stearylamine and stearic acid on HOPG using an AFM dynamical study in liquid. We have characterized DNA conformation on these nanotemplates in solution and explored DNA segmental movement in real time during several tens of minutes.…”

Section: Introductionmentioning

confidence: 99%

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Nanotemplate-directed DNA segmental thermal motion

2016

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanotemplate-directed DNA segmental thermal motion

2016

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“…4,5 The idea of inducing the motion of nano-objects by means of such periodic response of a polymer system to cyclic variation of the vapour environment was explored. 6 Recently, such experiments were achieved at the singlemolecule level: vapour-induced reptational movement 7,8 and reversible conformational transitions (collapse and re-extension) 9,10 of single flexible polymer chains on mica were observed in real-time. But in spite of this progress with single chains, bottle-brush-like macromolecules 11 still remain potentially more convenient systems for direct SFM observation in real time during repetitive conformational changes induced by cyclic exposure to vapours of different nature.…”

Section: Introductionmentioning

confidence: 99%

Motion of single wandering diblock-macromolecules directed by a PTFE nano-fence: real time SFM observations

Gallyamov

Qin

Matyjaszewski

et al. 2009

Phys. Chem. Chem. Phys.

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Using SFM we have observed a peculiar twisting motion of diblock macromolecules pre-collapsed in ethanol vapour during their subsequent spreading in water vapour. The intrinsic asymmetry of the diblock macromolecules has been considered to be the reason for such twisting. Further, friction-deposited PTFE nano-stripes have been employed as nano-trails with the purpose of inducing lateral directed motion of the asymmetric diblock macromolecules under cyclic impact from the changing vapour surroundings. Indeed, some of the macromolecules have demonstrated a certain tendency to orient along the PTFE stripes, and some of the oriented ones have moved occasionally in a directed manner along the trail. However, it has been difficult to reliably record such directed motion at the single molecule level due to some mobility of the PTFE nano-trails themselves in the changing vapour environment. In vapours, the PTFE stripes have demonstrated a distinct tendency towards conjunction. This tendency has manifested itself in efficient expelling of groups of the mobile brush-like molecules from the areas between two PTFE stripes joining in a zip-fastener manner. This different kind of vapour-induced cooperative macromolecular motion has been reliably observed as being directed. The PTFE nano-frame experiences some deformation when constraining the spreading macromolecules. We have estimated the possible force causing such deformation of the PTFE fence. The force has been found to be a few pN as calculated by a partial contribution from every single molecule of the constrained group.

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“…26 We also reported that the movement of isolated it-PMMA chains deposited on mica under high humidity could be observed in situ by AFM; the chains moved along their length similar to "reptational movements" on the substrate under high humidity. 27,28 The effect of the scanning AFM tip on the movements was proven to be negligible by several evidence, the most important one of which was that the observed movements of the chains during an interruption of the scanning were comparable to the movements during the scanning. We also visualized the crystallization behavior of an it-PMMA amorphous monolayer on mica into folded-chain crystals under high humidity in situ at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

In situ AFM Observation of the Movements of Isolated Isotactic Poly(methyl methacrylate) Chains in a Precursor Film of an Oligo(methyl methacrylate) Droplet Spreading on Mica

2020

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Atomic force microscopy (AFM) is a powerful tool to observe polymer chains at the molecular level. In this study, we show that the movements of isolated linear polymer chains in a precursor film of a droplet of an oligomer spreading on a substrate could be visualized in situ at the molecular level by AFM for the first time. The system was an isotactic poly(methyl methacrylate) (it-PMMA) solubilized in an oligo(MMA) matrix (it-PMMA/ oligo(MMA) = 1/10,000 w/w) spreading on mica under high humidity. Because of the limited resolution of the AFM instrument, condensed linear polymer chains could not be visualized, but a small amount of it-PMMA chains that were solubilized as isolated chains in the oligo(MMA) matrix could be visualized in the precursor film, the contrast of which came from a large difference in glass transition temperature (T g ) of it-PMMA and oligo(MMA). The it-PMMA chains in the precursor film spread in the radial direction of the droplet with vigorously changing chain conformations. The spreading rate of it-PMMA chains under 72% relative humidity was ∼1/30 of the spreading rate of the oligo(MMA) matrix, which was estimated based on the decrease in the volume of the macroscopic droplet. The spreading of the it-PMMA chains and droplet strongly depended on humidity and was suppressed with the decrease in humidity, most likely because of the increase in friction with the substrate. The difference in the spreading rate of it-PMMA and oligo(MMA) further increased under low humidity. The dynamic molecular information of a precursor film by AFM should help to elucidate the wetting dynamics on a substrate.

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Peculiar ‘Reptational’ Movements of Single Synthetic Polymer Chains on Substrate Observed by AFM

Cited by 13 publications

References 46 publications

Nanotemplate-directed DNA segmental thermal motion

Nanotemplate-directed DNA segmental thermal motion

Motion of single wandering diblock-macromolecules directed by a PTFE nano-fence: real time SFM observations

In situ AFM Observation of the Movements of Isolated Isotactic Poly(methyl methacrylate) Chains in a Precursor Film of an Oligo(methyl methacrylate) Droplet Spreading on Mica

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