Structure and Phase Composition of V-Al-N-C Master Alloy

Таранов, Д. В.; Larionov, A. V.; Chumarev, V. M.; Смирнов, Л. А.; Trubachev, M. V.; Vohmentsev, S A

doi:10.18502/kms.v5i1.3958

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…46 In another study, high dispersity enabled the conformational changes of the brushes, resulting in a hysteretic hydration response as a function of pH. 47 Brush thickness has also been found to alter the macroscopic wettability of zwitterionic polymers driven by brush chain associations. 11,48 Palai et al have found through machine learning importance analysis that brush thickness and density are highly important parameters toward protein adsorption.…”

Section: ■ Conclusionmentioning

confidence: 99%

Unveiling the Layered Structure of Sulfobetaine Polymer Brushes through Bimodal Atomic Force Microscopy

et al. 2023

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Many zwitterionic polymer brushes exhibit highly stimuli-responsive properties stemming from the strong dipole and electrostatic interaction of their building blocks. Here, we showed how a combination of two atomic force microscopy (AFM) modes can reveal the layered structure of poly(sulfobetaine methacrylate) brushes synthesized by surface-initiated atom-transfer radical polymerization. Due to polydispersity and anti-polyelectrolyte effect, a diffused layer emerges on top of a condensed layer of the brush as a function of salt concentration. The amplitudemodulation mode of the AFM, owing to the tip's dynamic motion, can only probe the more stable condensed layer near the substrate, whereas the force-spectroscopic mode with its high sensitivity can accurately detect the diffused layer and hence determine the total brush thickness. Infrared spectroscopy and quartz crystal microbalance monitoring revealed the strong ion-screening effect and higher brush hydration propensity of multivalent ions. Different cation valencies also showed subtle effects on the dimensionality of the layered structure. Our results highlight the usefulness of AFM in revealing various contextual phenomena that arise from the unique properties of zwitterionic polymers.

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