Multilayered hyperbolic Au/TiO₂ nanostructures for enhancing the nonlinear response around the epsilon-near-zero point

• Fernando Arturo Araiza-Sixtos,
• Mauricio Gomez-Robles,
• Rafael Salas-Montiel and
• Raúl Rangel-Rojo

Beilstein J. Nanotechnol. 2026, 17, 251–261, doi:10.3762/bjnano.17.17

• –dielectric Au/TiO2 structures. The samples were fabricated using Joule effect evaporation for gold and electron beam evaporation for titanium dioxide. Their structure was designed to have an epsilon-near-zero (ENZ) point at different wavelengths around 800 nm, in order to study their nonlinear response as a

• function of the resonance conditions around the ENZ point. The characterization of the linear properties of the samples was done using spectrophotometry and spectral ellipsometry. We studied the nonlinear response with the z-scan technique at different incident irradiances using a Ti:sapphire femtosecond

• laser, enabling us to characterize both the refractive and absorptive contributions to the nonlinear response. Due to the high pulse repetition rate inherent to Ti:sapphire systems and the presence of linear absorption in the samples, cumulative pulse-to-pulse thermal effects may be present. A modified

Comparative study on 3D morphologies of delignified, single tracheids and fibers of five wood species

• Helen Gorges,
• Felicitas von Usslar,
• Cordt Zollfrank,
• Silja Flenner,
• Imke Greving,
• Martin Müller,
• Clemens F. Schaber,
• Chuchu Li and
• Stanislav N. Gorb

Beilstein J. Nanotechnol. 2026, 17, 239–250, doi:10.3762/bjnano.17.16

• environmental conditions and their different functional requirements. For instance, larger lumina typically form in earlywood during optimal environmental conditions, while latewood tracheids develop narrower lumina as a response to limited growth resources [35][36]. It seems that larger lumina in earlywood

Structure-dependent thermochromism of PAZO thin films: theory and experiment

• Georgi Mateev,
• Dean Dimov,
• Nataliya Berberova-Buhova,
• Nikoleta Kircheva,
• Todor Dudev,
• Ludmila Nikolova,
• Elena Stoykova,
• Keehoon Hong,
• Dimana Nazarova,
• Silvia Angelova and
• Lian Nedelchev

Beilstein J. Nanotechnol. 2026, 17, 186–199, doi:10.3762/bjnano.17.12

• relationship between the structural organization of the polymer side chains and temperature-induced optical changes. By combining experimental spectroscopic techniques with theoretical modeling, we demonstrate that the thermochromic response of PAZO films is strongly influenced by molecular aggregation, film

• thickness, and thermal treatment conditions. The observed changes in optical properties suggest that this response is governed by temperature-induced modulation of molecular ordering and aggregation state, which in turn alters the electronic transitions responsible for light absorption. Theoretical

• when a 532 nm laser is used. Additionally, the thermal treatment leads to an increase in the response time in both cases. These findings can be analyzed in the context of previously reported results. In the study by Nedelchev et al. [18], a spectral dependence of ∆n on the pump laser wavelength was

Safe and sustainable by design with ML/AI: A transformative approach to advancing nanotechnology

• Georgia Melagraki

Beilstein J. Nanotechnol. 2026, 17, 176–185, doi:10.3762/bjnano.17.11

• new-approach methodologies or NAMs), and which include in silico (computational) assessment, can fully “open the box”, revealing mechanistic drivers and enabling establishment of dose-response relationships, read-across, and other insights that allows regulators to gain a deeper understanding in

• for rapid adjustments to nanomaterial formulations or processing parameters in response to emerging safety or efficacy concerns. By simulating how nanomaterials behave across varying operational scenarios – incorporating factors like temperature, pH, or mechanical stress – digital twins will

• the candidate materials until the final optimised one – while continuously refining design parameters in response to new data. However, this technologically advanced ecosystem still faces some critical hurdles to implementation. One major challenge is the complex and interdisciplinary nature of

From shield to spear: Charge-reversible nanocarriers in overcoming cancer therapy barriers

• Madhuri Yeduvaka,
• Pooja Mittal,
• Ameer Boyalakuntla,
• Usman Bee Shaik,
• Himanshu Sharma,
• Thakur Gurjeet Singh,
• Siva Nageswara Rao Gajula and
• Lakshmi Vineela Nalla

Beilstein J. Nanotechnol. 2026, 17, 159–175, doi:10.3762/bjnano.17.10

• , drug resistance, and poor tumour selectivity. In response to these limitations, nanotechnology-based drug delivery systems have gained prominence for enhancing solubility, improving molecular stability, enabling controlled drug release, and prolonging systemic circulation, offering superior therapeutic

• outcomes over traditional approaches. Among these innovations, charge-reversible nanocarriers have attracted considerable attention due to their ability to overcome physiological and pathological barriers in the tumour microenvironment (TME) by altering their surface charge in response to specific stimuli

• ) [15]. These systems can switch their surface charge in response to tumour microenvironment (TME) triggers such as pH changes, redox states, or enzymatic activity, enhancing drug stability, facilitating cellular uptake, and enabling targeted drug release. This responsive functionality gives CR-NDDSs a

Development and in vitro evaluation of liposomes and immunoliposomes containing 5-fluorouracil and R-phycoerythrin as a potential phototheranostic system for colorectal cancer

• Raissa Rodrigues Camelo,
• Vivianne Cortez Sombra Vandesmet,
• Octavio Vital Baccallini,
• José de Brito Vieira Neto,
• Thais da Silva Moreira,
• Luzia Kalyne Almeida Moreira Leal,
• Claudia Pessoa,
• Daniel Giuliano Cerri,
• Maria Vitória Lopes Badra Bentley,
• Josimar O. Eloy,
• Ivanildo José da Silva Júnior and
• Raquel Petrilli

Beilstein J. Nanotechnol. 2026, 17, 97–121, doi:10.3762/bjnano.17.7

• cancer, but there are cellular mechanisms of resistance, such as membrane transporters, which lower the therapeutic response rate. However, when the treatment with 5-FU was evaluated, associated with photodynamic therapy using Foslip® as a liposomal system, it was found that this treatment was effective

Functional surface engineering for cultural heritage protection: the role of superhydrophobic and superoleophobic coatings – a comprehensive review

• Giuseppe Cesare Lama,
• Marino Lavorgna,
• Letizia Verdolotti,
• Federica Recupido,
• Giovanna Giuliana Buonocore and
• Bharat Bhushan

Beilstein J. Nanotechnol. 2026, 17, 63–96, doi:10.3762/bjnano.17.6

• accidental but rather a targeted response to shifting political or cultural dynamics. The study underscores the importance of understanding both environmental and human threats in the preservation of ancient artworks, which also passes through their conservation, when stored or transported, in order to avoid

Microscopic study of the intermediate mixed state in intertype superconductors

• Vyacheslav D. Neverov,
• Alexander V. Kalashnikov,
• Andrey V. Krasavin and
• Alexei Vagov

Beilstein J. Nanotechnol. 2026, 17, 57–62, doi:10.3762/bjnano.17.5

• microscopic foundation for the IT superconductivity and extend its description beyond the vicinity of the critical temperature. Keywords: Bogoliubov–de Gennes equations; intertype regime; microscopic calculations; superconductivity; vortices in superconductors; Introduction The magnetic response of

Subdigital integumentary microstructure in Cyrtodactylus (Squamata: Gekkota): do those lineages with incipiently expressed toepads exclusively exhibit adhesive setae?

• Philipp Ginal,
• Yannick Ecker,
• Timothy Higham,
• L. Lee Grismer,
• Benjamin Wipfler,
• Dennis Rödder,
• Anthony Russell and
• Jendrian Riedel

Beilstein J. Nanotechnol. 2026, 17, 38–56, doi:10.3762/bjnano.17.4

• for chameleons, which evolved comparable microstructures [21][22]), likely evolved in response to the demands of climbing. Spines, prongs, and setae putatively evolved from spinules, which are the shortest of the microstructures of the outer epidemal layer (Oberhäutchen) [23][24][25]. Spinules

Quantitative estimation of nanoparticle/substrate adhesion by atomic force microscopy

• Aydan Çiçek,
• Markus Kratzer,
• Christian Teichert and
• Christian Mitterer

Beilstein J. Nanotechnol. 2026, 17, 1–14, doi:10.3762/bjnano.17.1

• ]. Further, the yield strength effects are also entirely omitted. In addition, neither chemical interactions with the substrate nor its mechanical response are considered. For small NP diameters (2–4 nm), the predicted deformation seems clearly overestimated, as the theoretical contact radius exceeds the NP

Internal 3D temperature mapping in biological systems using ratiometric light-sheet imaging and lipid-coated upconversion nanothermometers

• Dannareli Barron-Ortiz,
• Enric Pérez-Parets,
• Rubén D. Cadena-Nava,
• Emilio J. Gualda,
• Jacob Licea-Rodríguez,
• Juan Hernández-Cordero,
• Pablo Loza-Álvarez and
• Israel Rocha-Mendoza

Beilstein J. Nanotechnol. 2025, 16, 2306–2316, doi:10.3762/bjnano.16.159

• FIR response follows a Boltzmann-type exponential temperature dependence (see Equation 1), our previous work demonstrated that within the 25–50 °C interval in NaYF4:Yb3+/Er3+systems, the FIR behavior of lipid-coated UCNPs can be well approximated by a linear dependence with a slope of m ≈ 0.003 °C−1

• [40]. This finding is consistent with earlier experimental results showing a linear response up to 100 °C [44], confirming the robustness of this relationship across a broad thermal range. In the present study, the calibration was restricted to 25–33 °C to match the physiological temperature range of

• C. elegans and to evaluate the method’s sensitivity in detecting subtle temperature variations relevant to biological processes. The resulting temperature-dependent FIR response is illustrated in Figure 4b, covering the 25–33 °C range, with measurements taken at 2 °C intervals. This temperature

Improving magnetic properties of Mn- and Zn-doped core–shell iron oxide nanoparticles by tuning their size

• Dounia Louaguef,
• Ghouti Medjahdi,
• Sébastien Diliberto,
• Klaus M. Seemann,
• Thomas Gries,
• Joelle Bizeau,
• Damien Mertz,
• Eric Gaffet and
• Halima Alem

Beilstein J. Nanotechnol. 2025, 16, 2285–2295, doi:10.3762/bjnano.16.157

• ·kg−1 for their 5 nm counterparts. The addition of a MnFe2O4 shell further enhanced the magnetic response across all sizes, confirming its functional contribution to the overall magnetic behavior. Zero-field-cooled/field-cooled (ZFC/FC) analyses demonstrated the superparamagnetic nature of the

Geometry-controlled engineering of the low-temperature proximity effect in normal metal–superconductor junctions

• Munisa A. Tomayeva,
• Vyacheslav D. Neverov,
• Andrey V. Krasavin,
• Alexei Vagov and
• Mihail D. Croitoru

Beilstein J. Nanotechnol. 2025, 16, 2265–2273, doi:10.3762/bjnano.16.155

• proximity effect In a SC, superconductivity is intrinsic. The suppression of the order parameter, that is, the inverse proximity effect, is a localized response to the boundary condition or interface, and the pairing potential Δs(z) must recover to its self-consistent bulk value Δbulk on a characteristic

Chiral plasmonic nanostructures fabricated with circularly polarized light

• Tian Qiao and
• Ming Lee Tang

Beilstein J. Nanotechnol. 2025, 16, 2245–2264, doi:10.3762/bjnano.16.154

• two proteins due to the supramolecular interactions between the chiral extracellular domains and the curved chiral nanoparticles, which led to the enantiomer-dependent immunological response. Nam et al. have shown that the stronger binding affinities of molecules to regions of both positive and

Optical bio/chemical sensors for vitamin B₁₂ analysis in food and pharmaceuticals: state of the art, challenges, and future outlooks

• Seyed Mohammad Taghi Gharibzahedi and
• Zeynep Altintas

Beilstein J. Nanotechnol. 2025, 16, 2207–2244, doi:10.3762/bjnano.16.153

• showed potential for bioimaging Escherichia coli cells due to its fluorescence response when exposed to Co2+ [81]. A new fluorescent–colorimetric chemosensor was designed based on 1,8-bis{2-{N-[2′-(8′-hydroxy-9,10-anthraquinon-1-yloxy) ethyl] benzimidazoliumyl} ethoxy}-9′,10′ anthraquinone

• functioned as both the recognition unit and the chromophoric indicator, while the sensing response was expressed through ratiometric spectral variation. Upon interacting with this cation, a significant 44 nm shift in its absorption spectra by altering color from yellow to red was recorded, which could be

• naphthalene moiety (TSNCS)) has been recently designed for the colorimetric detection of Ni2+ and Co2+ ions, in which the Schiff-base provided the recognition site, the naphthalene group served as the chromophoric indicator, and the detection relied on a distinct colorimetric response. Upon exposure to these

Electromagnetic study of a split-ring resonator metamaterial with cold-electron bolometers

• Ekaterina A. Matrozova,
• Alexander V. Chiginev,
• Leonid S. Revin and
• Andrey L. Pankratov

Beilstein J. Nanotechnol. 2025, 16, 2199–2206, doi:10.3762/bjnano.16.152

• -established magnetic metamaterial element whose resonant properties are governed by its internal inductance and capacitance, allowing for a strong magnetic response and associated current loops at the designed resonance frequency. The simulations of the metamaterial arrays were performed in the time-domain

• ). Parameters of metamaterials with CEBs and different designs are given in Table 1. As an experimental reference for our simulations, Figure 2 also shows the frequency response measured for a fabricated sample consisting of a 19-element single-ring metamaterial (black dashed curve). This sample had the design

• described in [17] and was characterized using the same experimental setup described there. This setup employs a YBaCuO Josephson junction oscillator as a broadband source, with the signal delivered to the sample via an oversized waveguide. Therefore, the measured frequency response is the combined frequency

Microplastic pollution in Himalayan lakes: assessment, risks, and sustainable remediation strategies

• Sameeksha Rawat,
• S. M. Tauseef and
• Madhuben Sharma

Beilstein J. Nanotechnol. 2025, 16, 2144–2167, doi:10.3762/bjnano.16.148

• recently demonstrated the effectiveness of biofilms formed by engineered microbial consortia in expediting enzymatic degradation in response to specific environmental conditions, such as low temperatures [42]. Biofilms are very beneficial in habitats such as Himalayan lakes. Biofilm-based remediation

Quality by design optimization of microemulsions for topical delivery of Passiflora setacea seed oil

• Daniel T. Pereira,
• Douglas Dourado,
• Danielle T. Freire,
• Dayanne L. Porto,
• Cícero F. S. Aragão,
• Myla L. de Souza,
• Guilherme R. S. de Araujo,
• Ana Maria Costa,
• Wógenes N. Oliveira,
• Anne Sapin-Minet,
• Éverton N. Alencar and
• Eryvaldo Sócrates T. Egito

Beilstein J. Nanotechnol. 2025, 16, 2116–2131, doi:10.3762/bjnano.16.146

• generated to systematically explore the formulation space. The specific combinations and corresponding response results for all experimental runs are summarized in Table 4. Although the BBD does not include extreme combinations of variables, it improved precision and accuracy for predictions near the center

• of the experimental space. The prepared formulations corresponding to the experimental design runs are shown in Figure 4, and a summary of the BBD is presented in Table 5. To refine the model and improve predictive accuracy, the response data were subjected to Box–Cox transformation, an essential

• response surface plots for each response, as shown in Figure 6. The axes were selected based on the most significant interactions identified through ANOVA, while the third factor was held constant at its central level. The resulting plots provide a visual representation of the individual and interactive

Toward clinical translation of carbon nanomaterials in anticancer drug delivery: the need for standardisation

• Michał Bartkowski,
• Francesco Calzaferri and
• Silvia Giordani

Beilstein J. Nanotechnol. 2025, 16, 2092–2104, doi:10.3762/bjnano.16.144

• updated every decade [23][24]. The hallmarks framework has enabled researchers to develop more nuanced, spatially informed approaches to cancer therapy, reinforcing its role in driving multidisciplinary strategies for predicting treatment response [25]. Targeted drug delivery is an emerging

Calibration of piezo actuators and systems by dynamic interferometry

• Knarik Khachatryan and
• Michael Reichling

Beilstein J. Nanotechnol. 2025, 16, 2086–2091, doi:10.3762/bjnano.16.143

• parts with high accuracy. This is commonly accomplished by piezo actuators, for instance, in the form of tube piezos for positioning the tip or optics. For their calibration, we propose an approach based on the dynamic response signal from a fiber interferometer used for cantilever displacement

• detection. The fine-positioning z-piezo of the fiber is calibrated by the analysis of measurements of the dynamic interferometer response signal recorded for various cantilever oscillation amplitudes and varied distances between the cantilever and the fiber end. Furthermore, we demonstrate the cantilever

• a systematic effect yielding a bow shape that can qualitatively be explained by the action of creep accumulated over the extension steps. The striking observation that the bow is not observed for the contraction measurement points to a significant difference of the piezo response for contraction and

Multifrequency AFM integrating PeakForce tapping and higher eigenmodes for heterogeneous surface characterization

• Yanping Wei,
• Jiafeng Shen,
• Yirong Yao,
• Xuke Li,
• Ming Li and
• Peiling Ke

Beilstein J. Nanotechnol. 2025, 16, 2077–2085, doi:10.3762/bjnano.16.142

• piezoelectric actuator PD-II while the tip was retracted approximately 200 nm from the surface to avoid any influence of tip–sample interactions. The amplitude–frequency response was measured using the built-in lock-in amplifiers, and the operational excitation frequencies were determined by referencing the

• peaks of these response curves. The free oscillation amplitude for the higher eigenmode (e.g., 600 pm) was set based on the amplitude–frequency response curve. The voltage amplitude measured by the lock-in amplifier was converted to nanometers using the InvOLS coefficient obtained from the calibration

• extracted by lock-in amplifiers for compositional contrast. Driving and response signals in standard PFT mode. (Top) Vertical motion trajectory of the Z-piezo actuator (Z-PZT). (Bottom) Corresponding tip–sample force response, indicating key stages: (A) cycle start; (B) initial contact; (C) peak force; (D

Molecular and mechanical insights into gecko seta adhesion: multiscale simulations combining molecular dynamics and the finite element method

• Yash Jain,
• Saeed Norouzi,
• Tobias Materzok,
• Stanislav N. Gorb and
• Florian Müller-Plathe

Beilstein J. Nanotechnol. 2025, 16, 2055–2076, doi:10.3762/bjnano.16.141

• continuum and particle domains exchange information through a handshake region using our coupling algorithm, which will be detailed in Section “Methods”. The simulations presented in this paper visualize the mechanical response of whole seta and the peeling of spatulae during pull-off from a dry, smooth

• molecular resolution. This two-way, concurrent coupling turns adhesion from a prescribed boundary condition into an emergent, geometry- and state-dependent response: Local spatula-level peeling, sliding, and contact reorientation feed back into the global branched seta, which, in turn, reshapes the local

• mesh at the end of the spatulae were also removed to be replaced by molecular spatulae models. Table 1 lists the parameters and values used to construct the continuum part of the model. The finite element mesh response was governed by linear isotropic elasticity, with the stress–strain relationship

Beyond the shell: exploring polymer–lipid interfaces in core–shell nanofibers to carry hyaluronic acid and β-caryophyllene

• Aline Tavares da Silva Barreto,
• Francisco Alexandrino-Júnior,
• Bráulio Soares Arcanjo,
• Paulo Henrique de Souza Picciani and
• Kattya Gyselle de Holanda e Silva

Beilstein J. Nanotechnol. 2025, 16, 2015–2033, doi:10.3762/bjnano.16.139

• inflammatory response during wound healing [32][33]. Chemically, βCp is characterized as a natural bicyclic sesquiterpene found in several plants and essential oils, and as expected for compounds of this class, it exhibits characteristic volatility and low solubility in water [34]. To address these limitations

Mechanical property measurements enabled by short-term Fourier-transform of atomic force microscopy thermal deflection analysis

• Thomas Mathias,
• Roland Bennewitz and
• Philip Egberts

Beilstein J. Nanotechnol. 2025, 16, 1952–1962, doi:10.3762/bjnano.16.136

• contact stiffness. However, for harder materials, such as Si–HOPG or diamond–Si, model 1 (Figure 1a(i)) has a frequency response in the dispersion curve that saturates at a reduced frequency (f1/f0) that is lower than the measured reduced frequency. We note that the PtSi–PEO combination showed a high

• frequency response, which is unexpected for a soft material such as PEO. We attribute this to a very high elastic modulus measured a low penetration depths in PEO samples [26]. Model 3 (Figure 1a(iii))) in this case does not saturate as early, but the plateau in the dispersion curve translates into a wide

• the capture of the thermal motion of the AFM cantilever during a force-versus-distance measurement. STFT analysis was used to produce power spectra at regular time intervals during the experiments, with the frequency resolution varied to balance a faster time response of the cantilever’s oscillation

Evaluating metal-organic precursors for focused ion beam-induced deposition through solid-layer decomposition analysis

• Benedykt R. Jany,
• Katarzyna Madajska,
• Aleksandra Butrymowicz-Kubiak,
• Franciszek Krok and
• Iwona B. Szymańska

Beilstein J. Nanotechnol. 2025, 16, 1942–1951, doi:10.3762/bjnano.16.135

• create a new precursor, extensive testing using specialized gas injection systems is required along with time-consuming and costly chemical analysis typically conducted using scanning electron microscopy (SEM). This process can be quite challenging due to its complexity and expense. Here, the response of