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Abstract: The recent discovery of ferroelectric nematic liquid crystalline phases marks a major breakthrough in soft matter research. An intermediate phase, often observed between the nonpolar and the ferroelectric nematic phase, shows a distinct antiferroelectric response to electric fields. However, its structure and formation mechanisms remain debated, with flexoelectric and electrostatics effects proposed as competing mechanisms. By controlling the magnitude of electrostatic forces through ion addition in two representative ferroelectric nematic materials, it is shown that the primary mechanism for the emergence of antiferroelectric order is the flexoelectric coupling between electric polarization and splay deformation of the nematic director. The addition of ions significantly expands the temperature range over which the antiferroelectric phase is observed, with this range increasing with increasing ion concentration. Polarizing optical microscopy studies and second harmonic generation (SHG) microscopy reveal the splayed structure modulated in 2D, while SHG interferometry confirms its antiferroelectric character. The model previously used to describe pretransitional behavior is extended by incorporating the electrostatic contribution of ions. The model shows qualitative agreement with the experiments, accurately reproducing the phase diagram and temperature-dependent evolution of the modulation period of the observed structure.
Keywords: ferroelectric nematic liquids, flexoelectricity, antiferroelectric order
Published in DiRROS: 15.09.2025; Views: 299; Downloads: 133
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Keywords: gozdne vlake, gozdne ceste, hudourniki, varstvo pred poplavami, gozdno gradbeništvo, odvodnjavanje
Published in DiRROS: 12.09.2025; Views: 424; Downloads: 146
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Abstract: Using scanning tunneling microscopy (STM) and inelastic tunneling spectroscopy, the low-frequency vibrational modes of a 7-atom wide armchair graphene nanoribbon (7-AGNR) is mapped. The inelastic tunneling channel is enhanced over the elastic one by a covalently bonded 7-AGNR to the apex of an STM tip. This setup has led to resonant inelastic tunneling between vibrational states of supported 7-GNR on Au(111) substrate and the states of the functionalized STM tip. The low-energy spectra reveal two localized peaks at the armchair edges with energies at ±14 and ±30 mV. The peaks are assigned to twice the energies of longitudinal compressive and shear-like modes of 7-AGNR, respectively. Remarkably, the well-separated peaks evolve rapidly into one broader peak toward the bulk of the ribbon due to scattering from substrate interactions. This suggests that edge state phonons are uniquely protected from the microenvironment and may have a profound effect on the transport properties of GNR devices.
Keywords: scanning tunneling microscopy, inelastic tunneling spectroscopy, armchair graphene nanoribbons
Published in DiRROS: 12.09.2025; Views: 276; Downloads: 135
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Abstract: Hermeneutics of the Future as Hermeneutics of the technological Future The text discusses the challenges that philosophy of technology increasingly faces due to the emergence of new, the so-called transclassical techniques. This applies particularly to the field of technology assessment, where a “hermeneutic turn” is emerging, within which communicative practices and strategies for understanding how to deal with new technologies are being developed, rather than consequentialist, prognostic, and scenario-based approaches. Furthermore, the contribution first highlights the diversity of hermeneutic approaches and then discusses the guiding concept of a “hermeneutics of the future” in the philosophy of technology as the constitutive primacy of the future in the existential sense.
Keywords: hermeneutics, future, technology, understanding, philosophy of technology
Published in DiRROS: 11.09.2025; Views: 279; Downloads: 131
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Abstract: The paper is conceptualized on the premise that modern discourses on violence can be read within two fundamental paradigms: the paradigm of force (Simone Weil) and the paradigm of domination (Frankfurt School and its followers). While the first half of the 20th century can be viewed as the exemplification of force, after WWII we are instead faced with violence understood as domination. However, it seems that the 21st century begins with a return of force in a new form. The aim of the paper is to read Carl Schmitt’s political theology as an illustration and extension of Simone Weil’s analysis of force in “The Iliad, or the Poem of Force.” The essay is devoted to an analysis of Schmitt’s fundamental political-legal categories, such as sovereignty, decisionism, and friend–foe opposition as modern translations of force in Weil’s conceptualization: as invasions of brute force into the human order. The paper wishes to be not only an historical-philosophical analysis, but a contribution to the modern project of antifascist education, insofar as the modes of contemporary European authoritarianism (e.g., in Hungary and Poland) more or less overtly refer to the Schmittian legacy. Thus, the contribution aims at an intellectual depotentialization of this legacy and mitigation of the impact of its renaissance.
Keywords: Homer, Adorno, Horkheimer, Weil, Schmitt, force, violence, domination
Published in DiRROS: 11.09.2025; Views: 307; Downloads: 159
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