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17 results

  • Correlated mechanochemical maps of Arabidopsis thaliana primary cell walls using atomic force microscope infrared spectroscopy
  • Natasha Bilkey, Huiyong Li, Nikolay Borodinov, Anton V. Ievlev, Olga S. Ovchinnikova, Ram Dixit, Marcus Foston
  • Journal: Quantitative Plant Biology / Volume 3 / 2022
  • Published online by Cambridge University Press: 23 December 2022, e31
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  • View abstract

    Spatial heterogeneity in composition and organisation of the primary cell wall affects the mechanics of cellular morphogenesis. However, directly correlating cell wall composition, organisation and mechanics has been challenging. To overcome this barrier, we applied atomic force microscopy coupled with infrared (AFM-IR) spectroscopy to generate spatially correlated maps of chemical and mechanical properties for paraformaldehyde-fixed, intact Arabidopsis thaliana epidermal cell walls. AFM-IR spectra were deconvoluted by non-negative matrix factorisation (NMF) into a linear combination of IR spectral factors representing sets of chemical groups comprising different cell wall components. This approach enables quantification of chemical composition from IR spectral signatures and visualisation of chemical heterogeneity at nanometer resolution. Cross-correlation analysis of the spatial distribution of NMFs and mechanical properties suggests that the carbohydrate composition of cell wall junctions correlates with increased local stiffness. Together, our work establishes new methodology to use AFM-IR for the mechanochemical analysis of intact plant primary cell walls.

  • Ferroic twin domains in metal halide perovskites
  • Yongtao Liu, Alex Belianinov, Liam Collins, Roger Proksch, Anton V. Ievlev, Bin Hu, Sergei V. Kalinin, Olga S. Ovchinnikova
  • Journal: MRS Advances / Volume 4 / Issue 51-52 / 2019
  • Published online by Cambridge University Press: 23 September 2019, pp. 2817-2830
  • Print publication: 2019
  • View abstract

    An emerging family of materials—metal halide perovskites (MHPs)—have made incredible achievements in optoelectronics in the past decade. Owing to its potential role in optoelectronic properties, the ferroic state of MHPs has been investigated by lots of researchers. Here, we review the literature regarding investigations into possible ferroic behaviors in MHPs. We summarize the recent discoveries of ferroic twin domains in MHPs. We examine the ferroelasticity and the ferroelectricity of these twin domains. Several properties relevant to the twin domains are critically analyzed, including crystallographic structure, mechanical variation, chemical variation, etc. Finally, we discussed the effects of these domains on materials’ optoelectronic properties and their potential roles in photovoltaic action.