Microscopy techniques in the optimization of Nitinol implants: surface modification for improved biocompatibility and durability in the treatment of atrial septal defect

This dataset contains the results of surface characterization of Nitinol alloy samples and Nitinol samples modified with an SiO₂ coating deposited using the Atomic Layer Deposition (ALD) method. The work is dedicated to the development of surface engineering solutions for cardiovascular implants, particularly occluder systems for atrial septal defect (ASD) closure. The aim of the study was to correlate surface morphology, and potential delamination regions to assess the stability and biocompatibility of coated Nitinol substrates.Sample Preparation:Base material: NiTi (Nitinol, shape memory alloy)Surface modification: ALD coating of SiO₂Reference samples: Bare NiTi (without coating)Experimental Techniques:Scanning Electron Microscopy (SEM)High-resolution imaging of surface morphology. Reveals fine structures, coating homogeneity, and potential cracks in SiO₂ layers.Scanning Acoustic Microscopy (SAM)Stress maps visualized in grayscale and color modes. Detection of high-stress regions indicating coating delamination.Data Structure and Content:The dataset is organized into folders corresponding to the applied analysis techniques and sample types:Contains microscopic images of Nitinol and Nitinol+ALD surfaces.Data catalog SEM:High-resolution SEM micrographs of surfaces:NiTi surface - bare NiTi;NiTi+ALD - NiTi coated with SiO₂ (ALD).File format: TIFF/PNG.Data catalog SAM:Acoustic microscopy images:grey view - grayscale stress maps;color view - color-enhanced delamination mode maps.File format: JPG.