<i>SUNBIM</i>: a package for X-ray imaging of nano- and biomaterials using SAXS, WAXS, GISAXS and GIWAXS techniques

Siliqi, Dritan; De, Liberato; Ladisa, Massimo; Scattarella, Francesco; Mazzone, A.; Altamura, Davide; Sibillano, Teresa; Giannini, Cinzia

doi:10.1107/s1600576716006932

Cited by 39 publications

(29 citation statements)

References 30 publications

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“…An image plate (IP) detector with 100 μm pixel size was placed at 10 cm and 2 m from the sample to acquire WAXS and SAXS data, respectively. Once acquired, 2D data were calibrated by means of the Si NIST standard reference material (SRM 640b), for WAXS, and Silver Behenate powder, for SAXS, and folded into 1D profiles. A detailed description of the XMI−L@b performances can be found in Altamura et al .…”

Section: Methodsmentioning

confidence: 99%

Structural Characterization of Self‐Assembled Tetra‐Tryptophan Based Nanostructures: Variations on a Common Theme

et al. 2018

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Over the years, a large number of multidisciplinary investigations has unveiled that the self-assembly of short peptides and even of individual amino acids can generate a variety of different biomaterials. In this framework, we have recently reported that polyethylene glycol (PEG) conjugates of short homopeptides, containing aromatic amino acids such as phenylalanine (Phe, F) and naphthylalanine (Nal), are able to form elongated fibrillary aggregates having interesting chemical and physical properties. We here extend these analyses characterizing the self-assembling propensity of PEG -W4, a PEG adduct of the tetra-tryptophan (W4) sequence. A comprehensive structural characterization of PEG -W4 was obtained, both in solution and at the solid state, through the combination of spectroscopic, microscopic, X-ray scattering and computational techniques. Collectively, these studies demonstrate that this peptide is able to self-assemble in fibrillary networks characterized by a cross β-structure spine. The present findings clearly demonstrate that aromatic residues display a general propensity to induce self-aggregation phenomenon, despite the significant differences in the physicochemical properties of their side chains.

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Section: Methodsmentioning

confidence: 99%

Structural Characterization of Self‐Assembled Tetra‐Tryptophan Based Nanostructures: Variations on a Common Theme

et al. 2018

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“…There is evidence that the use of triplets may improve OPV efficiency due to their longer lifetime (Kö hler & Bä ssler, 2009), and even enable solar cell devices with internal quantum efficiencies approaching 200% utilizing singlet-triplet exciton fission (Congreve et al, 2013). Finally, the thin-film structures obtained from GIWAXS can be compared with single-crystal counterparts (if available) using a software package such as DPC (Hailey et al, 2014) or SUNBIM (Siliqi et al, 2016).…”

Section: Indexing Softwarementioning

confidence: 99%

GIWAXS-SIIRkit: scattering intensity, indexing and refraction calculation toolkit for grazing-incidence wide-angle X-ray scattering of organic materials

et al. 2020

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Grazing-incidence wide-angle X-ray scattering (GIWAXS) has become an increasingly popular technique for quantitative structural characterization and comparison of thin films. For this purpose, accurate intensity normalization and peak position determination are crucial. At present, few tools exist to estimate the uncertainties of these measurements. Here, a simulation package is introduced called GIWAXS-SIIRkit, where SIIR stands for scattering intensity, indexing and refraction. The package contains several tools that are freely available for download and can be executed in MATLAB. The package includes three functionalities: estimation of the relative scattering intensity and the corresponding uncertainty based on experimental setup and sample dimensions; extraction and indexing of peak positions to approximate the crystal structure of organic materials starting from calibrated GIWAXS patterns; and analysis of the effects of refraction on peak positions. Each tool is based on a graphical user interface and designed to have a short learning curve. A user guide is provided with detailed usage instruction, tips for adding functionality and customization, and exemplary files.

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“…The batch for the scanning SAXS/WAXS experiment and the composition of data in the color map were realized by using the in-house software SUNBIM. 65 …”

Section: Experimental Sectionmentioning

confidence: 99%

Anisotropic Conjugated Polymer Chain Conformation Tailors the Energy Migration in Nanofibers

et al. 2016

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Conjugated polymers are complex multichromophore systems, with emission properties strongly dependent on the electronic energy transfer through active subunits. Although the packing of the conjugated chains in the solid state is known to be a key factor to tailor the electronic energy transfer and the resulting optical properties, most of the current solution-based processing methods do not allow for effectively controlling the molecular order, thus making the full unveiling of energy transfer mechanisms very complex. Here we report on conjugated polymer fibers with tailored internal molecular order, leading to a significant enhancement of the emission quantum yield. Steady state and femtosecond time-resolved polarized spectroscopies evidence that excitation is directed toward those chromophores oriented along the fiber axis, on a typical time scale of picoseconds. These aligned and more extended chromophores, resulting from the high stretching rate and electric field applied during the fiber spinning process, lead to improved emission properties. Conjugated polymer fibers are relevant to develop optoelectronic plastic devices with enhanced and anisotropic properties.

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SUNBIM: a package for X-ray imaging of nano- and biomaterials using SAXS, WAXS, GISAXS and GIWAXS techniques

Cited by 39 publications

References 30 publications

Structural Characterization of Self‐Assembled Tetra‐Tryptophan Based Nanostructures: Variations on a Common Theme

Structural Characterization of Self‐Assembled Tetra‐Tryptophan Based Nanostructures: Variations on a Common Theme

GIWAXS-SIIRkit: scattering intensity, indexing and refraction calculation toolkit for grazing-incidence wide-angle X-ray scattering of organic materials

Anisotropic Conjugated Polymer Chain Conformation Tailors the Energy Migration in Nanofibers

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