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

• 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

• coherently the response generated at different planes within the medium without the need of phase matching [5]. Ideally, we would like these materials not to have linear absorption, which prevents the full exploitation of these properties. The presence of linear absorption means that ℑ{ε} ≠ 0, which

• [20]. Work has also expanded into complex geometries, such as hybrid metal–dielectric layered pyramids [10], AZO nanotrenches for molecular absorption sensing [4], and the first nanowire array exhibiting hyperbolic properties with negative refraction at 780 nm [21]. Previously, our group has studied

Gold nanoparticle-decorated reduced graphene oxide as a highly effective catalyst for the selective α,β-dehydrogenation of N-alkyl-4-piperidones

• Brenda Flore Kenyim,
• Mihir Tzalis,
• Marilyn Kaul,
• Robert Oestreich,
• Aysenur Limon,
• Chancellin Pecheu Nkepdep and
• Christoph Janiak

Beilstein J. Nanotechnol. 2026, 17, 218–238, doi:10.3762/bjnano.17.15

• micropores around 1 nm, with a small type-II contribution at larger P/P0 and a small H4 hysteresis loop, which is given by the mesoporous part of AC. rGO has a type-II isotherm due to unrestricted monolayer–multilayer adsorption up to high P/P0; the multilayer absorption appears to increase without limit

• the average size of nanoparticles based on X-ray diffraction data. To verify the gold loading in the Au-SiW9/rGO composite, a carefully weighed aliquot was dissolved in a microwave digestion system using conc. HNO3 (70%) and diluted HCl (5%) for atomic absorption spectroscopy (AAS). The measured gold

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

• 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

• thin layers subjected to thermal treatment at temperatures up to 300 °C. Particular attention is given to the changes in absorption features and spectral shifts that may arise from structural rearrangements within the material. To rationalize the experimental findings, density functional theory (DFT

• ) calculations were employed to model possible supramolecular architectures, allowing us to explore the correlation between thermally induced optical responses and the underlying molecular-level organization. Results and Discussion Experimental results Temperature dependence of absorption spectra Absorption

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

• tumour photodynamic therapy. The study highlights the excellent light absorption and ROS generation capacity of the material, allowing targeted tumour cell damage while sparing healthy tissues [56]. Similarly, a study reports thermo-responsive gold nanorod vesicles (USGRV-17-AAG) integrate NIR-II

Influence of surface characteristics on the in vitro stability and cell uptake of nanoliposomes for brain delivery

• Dushko Shalabalija,
• Ljubica Mihailova,
• Nikola Geskovski,
• Andreas Zimmer,
• Otmar Geiss,
• Sabrina Gioria,
• Diletta Scaccabarozzi and
• Marija Glavas Dodov

Beilstein J. Nanotechnol. 2026, 17, 139–158, doi:10.3762/bjnano.17.9

• true dynamics of NLs and drug absorption or trafficking within brain cells. Finally, optimized experimental conditions help reduce variability between cell uptake experiments and ensure that results are consistent across different cell passages, laboratories, or research conditions which is

• outlet of the MWD detector was connected to a DAWN 8+ HELEOS II MALS operating with a 658 nm laser (Wyatt Technology Europe). A DLS (Malvern Zetasizer Nano-S, UK) with an installed quartz flow cell (ZEN0023) was also used in this study in flow mode. Refractive index (RI) and absorption parameters were

• ), observed at a retention time of about 20 min, are most likely related to the absorption of the PEG present on the surface of NLs. In addition, it can be seen that a more intense absorption peak is obtained at the same retention time for NLb1, the formulation with the highest amount of PEG on the surface

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

• relevant when considering different threats. Water is the most pervasive menace, in both indoor and outdoor environments [52]. For stone and other inorganic materials, high porosity and surface irregularities can increase coating absorption, resulting in thicker and less uniform layers that compromise

• porous stones like Lecce stone, commonly used in cultural heritage structures (mainly constituted by calcite). This coating effectively reduces water absorption and resists graffiti staining, helping to preserve the material from environmental and human-induced damage. Importantly, it does so without

• copolymer reduced wettability but failed to limit water absorption and showed poor resistance under rain exposure, similar to untreated samples. In contrast, the silicon-based coatings demonstrated better long-term hydrophobicity and surface stability. Among them, PSW slightly enhanced water retention

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

• photonic UC of multiple NIR photons into visible luminescence [38]. As an example, in the NaYF4:Er3+/Yb3+ composite (such as that used in this work), the NaYF4 crystal matrix is co-doped with Yb3+ acting as the sensitizer to enhance the NIR absorption cross section, whereas the Er3+ ion acts as the emitter

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

• generate heat through Brownian and Néel relaxation mechanisms [4]. The heat generation capacity of these nanoparticles is often quantified by the specific absorption rate (SAR), which represents the power dissipated as heat per gram of nanoparticles under the influence of an alternating magnetic field. The

• spectra were acquired from 400 to 4000 cm−1 with a spectral resolution of 4 cm−1. Reference spectra were acquired before each measurement to determine the absorption spectra under ambient conditions. Each measurement was averaged over 200 scans in continuous mode to improve the signal-to-noise ratio

• ferrites, the strong absorption bands corresponding to the Fe–O bonds at tetrahedral and octahedral sites are significantly more intense than the Zn–O and Mn–O vibrational modes, which have lower dipole moment changes during vibration. As a result, the Fe–O vibrations dominate the FTIR spectrum

Visualizing nanostructures in supramolecular hydrogels: a correlative study using confocal and cryogenic scanning electron microscopy

• Shaun M. Smith,
• Ferdinando Malagreca,
• Jacqueline Hicks,
• Giuseppe Mantovani,
• David B. Amabilino,
• Christopher Parmenter and
• Lluïsa Pérez-García

Beilstein J. Nanotechnol. 2025, 16, 2274–2284, doi:10.3762/bjnano.16.156

• diketopyrrolopyrrole bis(carboxylic acid) (DPP-BC) (Figure 1), are probed using confocal fluorescence microscopy and cryo-SEM. ZnPc is a water-soluble fluorophore with a conjugated and mainly flat macrocyclic structure, characterized by strong absorption in the red region of the visible spectrum, and has been

• observed upon mixing aqueous and ethanolic solutions, and gelation generally occurred in less than one minute (as judged by vial inversion) to yield the gel materials containing the chosen fluorophore. Photophysical characterization of fluorophore@Gels UV–visible absorption spectroscopy was performed using

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

• lengths are usually required to obtain reliable experimental results. These challenges can be addressed using chiral plasmonic nanostructures (cPNSs). cPNSs enhance the intensity of the electromagnetic near field of circularly polarized light (CPL), which accelerates light absorption by molecules

• magnitude) with light-absorbing reactants observed at optical hot spots compared to other locations. Hot carriers generated in PNSs can transfer into molecular species and trigger redox reactions. The rate of hot carrier generation strongly depends on the PNS absorption, proportional to the electric field

• solutions by sonicating the substrates in an aqueous solution of surfactant. 2.4 Plasmon-mediated polymer motions and polymerization using CPL The enhanced EM field under CPL of achiral PNSs can result in a spatially dissymmetric distribution of light absorption by chromophores. As depicted in Figure 5a

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

• different food and pharma formulations include high-performance liquid chromatography (HPLC) [14], HPLC coupled with inductively coupled plasma-mass spectrometry (ICP-MS) [15], and a diode array detector [16], atomic absorption spectroscopy [17], surface-enhanced Raman spectroscopy [18][19], capillary

• for adults in the European Union is 4.0 µg [32][33]. The bioavailability of VB12 in food sources for healthy adults with typical absorption efficiency is roughly estimated to be 50%. In contrast, crystalline VB12 incorporated into supplements and fortified foods shows an absorption rate ranging from

• 55% to 74%. Hence, it is important to note that the absorption rates vary greatly depending on the specific food items; for instance, egg products, fish, and lean meat have an absorption rate of 24% to 36% (VB12 dose 0.30–0.94 µg), 42% (dose 1.95–2.18 µg), and 65% (dose 0.95 µg), respectively [34][35

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

• bandwidth. The trade-off between the bandwidth expansion due to miniaturization and the reduction in absorption efficiency determined by the Airy spot size of the coupling lens is investigated. To solve this issue, a simultaneous miniaturization of the size of the entire structure with an increase in the

• number of array elements is proposed. The design with a 37-element array demonstrates an increase in power absorption by a factor of 1.4 compared to the original 19-element single-ring array, as well as an increase in operating bandwidth from 160 to 820 GHz. Keywords: cold-electron bolometer

• metamaterial comprising 19-ring antennas enabled the reception of external electromagnetic signals in the broad band from 150 to 550 GHz, as well as in the band from 900 to 1300 GHz. To further enhance signal absorption, we propose replacing simple ring antennas with SRRs [19][20][18][21]. The SRR is a well

Ultrathin water layers on mannosylated gold nanoparticles

• Maiara A. Iriarte Alonso,
• Jorge H. Melillo,
• Silvina Cerveny,
• Yujin Tong and
• Alexander M. Bittner

Beilstein J. Nanotechnol. 2025, 16, 2183–2198, doi:10.3762/bjnano.16.151

• organic layers. In contrast, VSFG was applied to obtain interface-sensitive information on CH and OH bonds at the AuNP/air interface, under hydration and dehydration. We also used a deuterated water (D2O) atmosphere to distinguish the mannosyl hydroxy groups from adsorbed and absorbed water. Absorption is

• ~1.5 nm (Figure 4). Hence, we propose a 100% thickness increase due to water adsorption or absorption, that is, the water can be adsorbed in a layer or absorbed among the various dimannoside groups. The latter case would correspond to a “swelling” of the AuNP coating, which is agreement with

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

• simultaneously utilizing the abundant UV radiation [75]. It has been demonstrated that the light absorption of ZnO and TiO2 is improved by defect engineering, such as the introduction of oxygen vacancies. According to Kim and Youn, these defects trap light energy, which lowers charge carrier recombination rates

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

• . De Santana et al. (2015) [3] reported that this enhanced activity, reflected in both radical scavenging and oxygen radical absorption capacities, is associated with the elevated levels of tocopherol isomers and total phenolic compounds in P. setacea samples. Overall, the composition of OPS has been

Stereodiscrimination of guests in chiral organosilica aerogels studied by ESR spectroscopy

• Sebastian Polarz,
• Yasar Krysiak,
• Martin Wessig and
• Florian Kuhlmann

Beilstein J. Nanotechnol. 2025, 16, 2034–2054, doi:10.3762/bjnano.16.140

• solid-state situation of the spin probe. In ESR, one always plots the first derivative of absorption spectra, which means that the magnetic susceptibility χ is proportional to the second integral of the curves, that is, proportional to the area of absorption signals. No correlation exists between χ and

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

• applications and naturally occurring in vertebrates [26][27]. It is a key element of the extracellular matrix, providing a gelatinous structure where collagen and elastin fibers are embedded. As an endogenous molecule, it demonstrates ideal biocompatibility and full absorption by human tissues. Its natural

Laser ablation in liquids for shape-tailored synthesis of nanomaterials: status and challenges

• Natalie Tarasenka

Beilstein J. Nanotechnol. 2025, 16, 1963–1997, doi:10.3762/bjnano.16.137

• : thermal evaporation and explosive ejection [1]. According to the thermal evaporation mechanism, the action of a laser beam on the surface of a solid target initiates the absorption of the laser pulse energy. This results in initiation of melting and ionization with the formation of a plasma plume near the

• the anisotropic growth and self-assembly of nanostructures with the formation of nanorods and nanosheets. It is currently agreed that media surrounding the particles also influence the surface energy dependence on nanoparticle size. If ions or surfactants are present in the solution, their absorption

• has an absorption band at 248 nm, the wavelength change from 248 nm to 532 nm resulted in a significant decrease in absorption and consequent production of near-spherical NPs, similarly to those obtained in other solvents that do not directly participate in chemical interactions with the liquid

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

• , precursor 1 exhibited a higher propensity for gallium absorption during irradiation. By analyzing the ion beam-induced decomposition of the precursors, which resulted in the formation of structures with varying chemical composition, we were able to assign performance scores to each precursor. To visualize

Quantum circuits with SINIS structures

• Mikhail Tarasov,
• Mikhail Fominskii,
• Aleksandra Gunbina,
• Artem Krasilnikov,
• Maria Mansfeld,
• Dmitrii Kukushkin,
• Andrei Maruhno,
• Valeria Ievleva,
• Mikhail Strelkov,
• Daniil Zhogov,
• Konstantin Arutyunov,
• Vyacheslav Vdovin,
• Vladislav Stolyarov and
• Valerian Edelman

Beilstein J. Nanotechnol. 2025, 16, 1931–1941, doi:10.3762/bjnano.16.134

• fact that, in the case of heating the absorber by direct current, the electron temperature of all conduction electrons increases. In the equilibrium state, the electron temperature is determined by the incoming power and the electron–phonon interaction. However, in cases of absorption of a photon with

• an energy much higher than the thermal energy, the quantum absorption mechanism is already realized, and the real absorption picture becomes much more complicated [19]. It is necessary to take into account many other parameters and relaxation mechanisms. An example of the thermalization process of a

Further insights into the thermodynamics of linear carbon chains for temperatures ranging from 13 to 300 K

• Alexandre Rocha Paschoal,
• Thiago Alves de Moura,
• Juan S. Rodríguez-Hernández,
• Carlos William de Araujo Paschoal,
• Yoong Ahm Kim,
• Morinobu Endo and
• Paulo T. Araujo

Beilstein J. Nanotechnol. 2025, 16, 1818–1825, doi:10.3762/bjnano.16.125

• gradients), and mechanical (e.g., pressure variations) stimuli [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. These responses are directly connected with electronic and transport properties, which in turn depend on the equilibrium between emission and absorption of

• phonons, and gain and loss of energy of carriers [1][2][10][17][24][25][26][27][28]. The phonon lifetime as well as the selection rules behind ph–ph and e–ph interactions determine the efficiency of such phonon emission and absorption [1][2][10][17][24][25][26][27][28]. Phonons need to be in an excited

Electrical, photocatalytic, and sensory properties of graphene oxide and polyimide implanted with low- and medium-energy silver ions

• Josef Novák,
• Eva Štěpanovská,
• Petr Malinský,
• Vlastimil Mazánek,
• Jan Luxa,
• Ulrich Kentsch and
• Zdeněk Sofer

Beilstein J. Nanotechnol. 2025, 16, 1794–1811, doi:10.3762/bjnano.16.123

• bandgap and an increased density of states near the Fermi level, promotes absorption in the visible region and facilitates the generation of electron–hole (e−–h+) pairs upon light irradiation. The silver clusters also exhibit plasmonic resonances, which amplify the local electromagnetic field and promote

• the generation of excited states with longer lifetimes [18]. Photocatalysis is a surface-driven process in which the absorption of photons with energy equal to or greater than the material’s bandgap results in the generation of e−–h+ pairs. These photogenerated charge carriers migrate to the surface

• spectral range, enhancing light absorption and enabling the utilization of a broader portion of the solar spectrum [19]. These combined effects result in a significantly higher photocatalytic efficiency of implanted samples compared to their non-implanted samples, both in terms of reaction rate and quantum

Exploring the potential of polymers: advancements in oral nanocarrier technology

• Rousilândia de Araujo Silva,
• Igor Eduardo Silva Arruda,
• Luise Lopes Chaves,
• Mônica Felts de La Roca Soares and
• Jose Lamartine Soares Sobrinho

Beilstein J. Nanotechnol. 2025, 16, 1751–1793, doi:10.3762/bjnano.16.122

• , and maintaining homeostasis within the GIT. The diverse cells of the intestinal epithelium can be explored as therapeutic targets for oral absorption, given the significant roles they play in the epithelial barrier [9]. Nanotechnology is a field that focuses on the study and production of nanometric

• investigated. These nanoparticles (NPs) preserve the bioactivity of the active compound during gastric transit and facilitate permeation through mucus and absorption by epithelial cells, enabling targeted delivery. In essence, PNs offer superior performance in protecting, targeting, and enhancing both the

• absorption by interacting with food, digestive enzymes, bile salts, electrolytes, and mucus. Polymers enable diverse surface functionalities tailored to therapeutic demands, including adhesive, bioinert, or charge-conversion functionalities that modify zeta potential and hydrophilic properties, among others

Multifunctional anionic nanoemulsion with linseed oil and lecithin: a preliminary approach for dry eye disease

• Niédja Fittipaldi Vasconcelos,
• Almerinda Agrelli,
• Rayane Cristine Santos da Silva,
• Carina Lucena Mendes-Marques,
• Isabel Renata de Souza Arruda,
• Priscilla Stela Santana de Oliveira,
• Mércia Liane de Oliveira and
• Giovanna Machado

Beilstein J. Nanotechnol. 2025, 16, 1711–1733, doi:10.3762/bjnano.16.120

• %) pre-formulation in OV. This process increased the pH of the nanoformulations by buffering salts such as NaHPO4 and Na2PO4. Maintaining the pH within the range of 6.5–8.0 ensures ocular compatibility, avoiding irritation and enhancing drug absorption [92][105][106]. Morphological, stability, and

Beyond the bilayer: multilayered hygroscopic actuation in pine cone scales

• Kim Ulrich,
• Max David Mylo,
• Tom Masselter,
• Fabian Scheckenbach,
• Sophia Fischerbauer,
• Martin Nopens,
• Silja Flenner,
• Imke Greving,
• Linnea Hesse and
• Thomas Speck

Beilstein J. Nanotechnol. 2025, 16, 1695–1710, doi:10.3762/bjnano.16.119

• allowed us to make precise analyses of the moisture content (Figure 4A). The behavior of the sclereid cells and the brown tissue revealed marked differences particularly above 50% RH. During absorption at 60% RH, the moisture content of the brown tissue is 0.37 percentage points lower than that of the

• sclereid cells, when looking at absolute differences. At 90% RH, the moisture content of the brown tissue is 2.13 percentage points lower. The sclerenchyma fibers have a lower moisture content than the other two tissues even at lower RHs. At 30% RH during absorption, their moisture content is 0.43

• , the sclereid cells achieve a moisture content of 27.7 ± 0.4% for desorption and 26.8 ± 0.4% for absorption. In comparison, the sclerenchyma fibers achieve a moisture content of 23.7 ± 0.6% for desorption and 23.0 ± 0.5% for absorption. In terms of the hysteresis observed, the difference in moisture