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

• , we report on the synthesis of polyhedral core–shell SPIONs. Their size was tuned to improve their magnetic properties. Furthermore, by hybridizing into a core–shell inorganic/inorganic structure, the nanoparticles can achieve significantly improved magnetic-to-thermal energy conversion efficiency (at

• while expecting good biocompatibility. The use of size-controlled synthesis enables the exploration of size-dependent magnetic properties, while the direct characterization of the core–shell structure using Fourier-transform infrared spectroscopy (FTIR) and high-resolution transmission electron

• indexed to the (222), (400), (111), and (311) planes of a spinel-type structure, in agreement with the X-ray diffraction (XRD) data (Figure S1, Supporting Information File 1). The presence of the (222) reflection, which is forbidden in XRD for a perfect spinel () due to structure factor constraints, can

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

• ; microscopies; nanostructure; supramolecular hydrogel; Introduction Hydrogels, whether based on self-assembling molecules or cross-linked polymers, are useful in fields ranging from tissue engineering to drug delivery and biosensing [1][2][3][4][5]. Their high water content and soft, porous structure make them

• 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

• relies on fluorescence to visualize hydrated gels directly, cryo-SEM provides an electron-based image of frozen desolvated gels. Rapidly freezing the sample (plunge-freezing in liquid nitrogen slush followed by freeze-fracture) preserves its near-native hydrated structure (usually not the case, often ice

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

• assumptions such as quasiclassical approximations or linearized gap equations. Our approach thus captures both the microscopic structure of the pairing correlations and the influence of boundary-induced inhomogeneities in a unified framework. We find that the power-law decay of the induced pair amplitude in

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

• nanoparticles that lack clear structural chirality limit the understanding of structure–property relationships. To increase the structural chirality in metallic chiral nanostructures, we recently developed an approach to control NC surface passivation to achieve higher dissymmetry in the spatial profile for Ag

• cPNSs synthesized with chiral molecules present [110][111]. This understanding about how CPL dictates chiral structure formation is also applicable to nanofabrication technologies. For example, the chiral EM near field or photoelectron profile can create chiral patterns in photolithography and electron

• ) measures the interaction between electrons and cPNSs upon laser excitation by mapping the EELS within an electron microscope [135] (Figure 8e). In summary, we have reviewed the nanoscale characterization tools correlating structure to chiroptical activity of PNSs in this section. CD and ORD are handy tools

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

• levels of VB12 in foods and pharmaceuticals is crucial for health management and disease prevention. VB12 is also known as cobalamin due to the presence of a central cobalt ion (Co2+) within the structure of its modified tetrapyrrole ring (Figure 1). A unique feature of the tetrapyrrole-derived ring in

• symmetrical rings found in heme and chlorophyll [2][11]. The structure of VB12 also includes a nucleotide loop that contains a unique base known as dimethylbenzimidazole (DMB). This nucleotide loop is attached to one of the propionate side chains of the corrin ring via an aminopropanol linker and stretches

• out below the corrin ring’s plane. This particular arrangement allows the DMB base to act as a secondary ligand for the central cobalt ion (Co2+), playing a crucial role in the molecule’s structural integrity and biological activity. Within the structure of VB12, Co2+ is capable of binding to an upper

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

• solver of CST MWS in 3D mode. The simulated receiving structure is placed on a 500 μm thick silicon substrate. A 4 mm-diameter silicon hyperhemispherical lens is placed on the rear side of the substrate to efficiently couple the incident radiation into the planar structure. The external signal is

• of dext = 80 μm and an inner ring diameter of dint = 70 μm. The lattice constant (period) of the metamaterial array is P = 86 μm. The total size of the structure is 424 μm. A large-scale SRR has an outer ring with an external diameter of dext,1 = 80 μm and an internal diameter of dint,1 = 70 μm. The

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

• the alpha level was kept at 0.05. Structures of gold nanoparticles used in this work. (A) PEG AuNPs were obtained in the presence of carboxyl PEG thiol. (B) Dimanno-AuNPs were covered with 50% of dimannoside and 50% of carboxyl PEG thiol. Note that, in (A) and (B), the linear structure of the

Hartree–Fock interaction in superconducting condensate fractals

• Edward G. Nikonov,
• Yajiang Chen,
• Mauro M. Doria and
• Arkady A. Shanenko

Beilstein J. Nanotechnol. 2025, 16, 2177–2182, doi:10.3762/bjnano.16.150

• –Beenker tilings [23], well-known representations of two-dimensional quasicrystals. Recent studies confirm that the superconducting condensate in quasiperiodic systems possesses a highly nontrivial spatial structure. This finding naturally raises the question of how sensitive the theoretical predictions

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

• influence the food web structure [4]. For instance, a study in Dal Lake recorded MP concentrations of 2450 particles/m2 in sediments and 9.8 particles/L in surface water [11], indicating significant ecological exposure. 3.3 Global comparison with other sensitive aquatic ecosystems Across the globe, MPs have

• ) spectroscopy is used regularly to identify the chemical structure of MPs [34]. One of the most important developments for nanoplastic detection in complex environmental matrices is micro-FTIR to analyze particles smaller than 10 µm [35]. Raman spectroscopy improves on FTIR by using higher resolution and the

• is an emerging area. The defects in the crystal structure of nanomaterials trap light energy and enhance the production of ROS. According to Kim and Youn, these developments are essential to address the robustness and effectiveness of photocatalysts in a variety of environmental conditions [77]. 6.2

Electron transport through nanoscale multilayer graphene and hexagonal boron nitride junctions

• Aleksandar Staykov and
• Takaya Fujisaki

Beilstein J. Nanotechnol. 2025, 16, 2132–2143, doi:10.3762/bjnano.16.147

• defects are results of C–C bond rotation in the graphene plane, which isomerizes a 6–6 ring structure to a 7–5 ring structure. Stone–Wales defects are commonly observed in multilayer graphene, graphite, graphene oxide, and their occurrence is temperature-dependent [15][16]. Hexagonal boron nitride (h-BN

• ) is a material that shares many structural and electronic properties with graphite. It is isoelectronic to graphene with N contributing two electrons to the π-conjugated bond and B contributing zero electrons, as opposed to graphene, where each C atom contributes one electron. The h-BN structure is

• h-BN with Stone–Wales defect. For graphite and bulk h-BN, we adopt a graphite unit cell with A–B stacking consisting of two layers and two atoms per layer. We perform geometry optimization, density of states (DOS) calculations, and band structure calculations. For graphite and h-BN with Stone–Wales

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

• . Accordingly, the microemulsions were evaluated for their shear stress and viscosity at both room temperature (25 ± 2 °C) and skin temperature (32.5 ± 2 °C). Microemulsions can exhibit diverse rheological behaviors depending on their type, structure, droplet density, and interdroplet interactions [49]. As

Rapid synthesis of highly monodisperse AgSbS₂ nanocrystals: unveiling multifaceted activities in cancer therapy, antibacterial strategies, and antioxidant defense

• Funda Ulusu,
• Adem Sarilmaz,
• Yakup Ulusu,
• Faruk Ozel and
• Mahmut Kus

Beilstein J. Nanotechnol. 2025, 16, 2105–2115, doi:10.3762/bjnano.16.145

• gram-negative (Escherichia coli) pathogenic bacteria were evaluated, along with their DPPH scavenging activities. The crystal structure of the synthesized NCs was elucidated through XRD analysis, revealing characteristic diffraction peaks corresponding to the (111), (200), (220), (311), and (222

• Structural and morphological characterization of AgSbS2 NCs The crystal structure and phase of AgSbS2 NCs were investigated by XRD analysis. The obtained diffraction pattern and a schematic representation of the crystal structure are given in Figure 1. As can be seen from the XRD pattern, five dominant peaks

• separate interaction exists between 6 sulfur atoms and silver and antimony atoms. Also, the obtained diffraction peaks are neat and intense, indicating the absence of other secondary phase peaks, and proving the successful synthesis of the desired structure. FTIR analysis was carried out in the range of

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

• doxorubicin (DOX), for example. Used in cancer treatment for decades, DOX has become a mainstay in oncology and is often nicknamed “the red devil” [34]. This name stems not only from its distinctive red colour, attributed to the quinone ring in its chemical structure, which absorbs in the visible spectrum and

• class, substantial variability in structure and surface chemistry can arise depending on the synthesis and purification methods employed, resulting in divergent biological outcomes. For example, carbon dots (CDs) smaller than 6 nm are typically cleared rapidly via the renal route, whereas larger CDs

• their surface chemistry and structure, emphasizing the need for systematic evaluation of their degradation pathways and by-products to ensure the safe design of nanomedicines. Moreover, CNMs can contain impurities that may impact their biological activity and safety. Therefore, it is important to assess

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

• [26] depending on minute charges in the beam profile or cantilever alignment. Both effects result in a considerable dependence of the lateral intensity distribution in the cantilever plane [25] on details of the alignment and, in turn, have an impact on the amount and interference structure of the

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

• structure similar to a fiber-reinforced elastomer, with a fibrillar nature that leads to anisotropic mechanical properties [40][41][42]. Rather than explicitly resolving individual fibers and the surrounding amorphous matrix, we represented the spatula with a coarse-grained bead network whose anisotropic

• fibrillar structure was encoded through direction-dependent bond stiffnesses. Figure 5a shows the molecular spatula with beads colored according to different regions (tip/pad/shaft). Each bead, representing approximately five keratin molecules or 2.5 keratin dimers (65228 Da), was connected to 30

• , differences in adhesion originate from structure and geometry rather than interface chemistry. We analyzed the 16 spatulae individually. Figure 10, Figure 11, and Figure 12 report, respectively, their force, contact, and displacement profiles in a representative run. Across runs, orientation (pad- vs tip

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

• the chromatographic separation of enantiomers. Despite these materials being highly engineered and commercially available, optimization was often done empirically. A rational design of future and improved solid phases for chiral chromatography requires that one understands how the chemical structure

• displays the typical aerogel structure with a random pore system and polydisperse sizes from 30 to 250 nm. The high porosity was confirmed by nitrogen physisorption analysis (Figure 2b). The isotherm is typical for a material with large mesopores and macropores, and the specific surface area, ABET, is 552

• m2·g−1. The meso-macroporous structure was also found by mercury intrusion porosimetry (Figure 2c). The FTIR spectrum is consistent with the proposed composition (Figure 2d). The vibrations at ν = 3000–3600 cm−1 are characteristic for NH and OH groups. At 2982 cm−1, one sees the CH groups. Amide

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

• -sectional imaging, and attenuated total reflectance with Fourier transform infrared (ATR-FTIR) spectroscopy provided compelling evidence for the successful formation of the intended core–shell structure. The resulting nanofibers exhibited surface hydrophobicity, suggesting potential for anti-adhesive

• properties of nanofibers and create advanced structures with enhanced functionality, coaxial electrospinning can be used to generate nanofibers allowing for the building of a core–shell structure with desirable properties, taking advantage of the positive characteristics of each component (core and shell

• 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

The cement of the tube-dwelling polychaete Sabellaria alveolata: a complex composite adhesive material

• Emilie Duthoo,
• Aurélie Lambert,
• Pierre Becker,
• Carla Pugliese,
• Jean-Marc Baele,
• Arnaud Delfairière,
• Matthew J. Harrington and
• Patrick Flammang

Beilstein J. Nanotechnol. 2025, 16, 1998–2014, doi:10.3762/bjnano.16.138

• . Transverse sections through the tubes could be imaged with high resolution in SEM (JEOL JSM-7200F), showing the arrangement of cement spots binding mineral particles together. The epoxy resin embedding technique provided excellent preservation of the cement spot structure. Honeycomb worms embedded in Spurr

• distinguish both types of cement glands based on their secretory granule morphology, and images were taken with an AxioCam 305 digital camera (Carl Zeiss MicroImaging). Results Tube structure As described by Vovelle [6], the tubes of S. alveolata are generally rectilinear and cylindrical, measuring up to 12

• it a smooth appearance. The hollow spheroids, measuring about 0.3–6.8 μm in diameter, appear empty at their centers. Their cortex is electron-dense and possesses a concentric lamellar structure. The thickness of this cortex also seems to increase with the spheroid size and can measure up to 400 nm

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

• , shape, crystal structure, and temperature [12]. As a result, thermodynamically controlled growth typically results in near-spherical NPs. The lowest surface energy of nanospheres also induces the transformation of other shapes into spherical ones. The effect of surface energy is most pronounced in small

• , Figure 2 demonstrates the correlation of the shape of laser-induced plasma generated in the electric field applied directly to a Zn target with NP structure. The plasma imaging (Figure 2b,c) demonstrates clear differences in shape depending on the applied field direction. In case of cathode ablation, the

• in the next sections. Chemical processes occurring during laser ablation influence not only composition but also the chemical structure of the formed nanostructures and their surface, guiding NP growth and morphology change processes. In principle, chemical reactions are present at every stage of

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

• of the overall structure. Analytical models for interpreting the vibrational modes of cantilevers were developed prior to the invention of the technique [7][8]. This model or variations of it are often presented in manuscripts to explain the interpretation of experimental data, but are not used to

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

• occurs throughout ion irradiation, this point marks the transition beyond which further irradiation leads primarily to material removal rather than the structure growth. The structures formed at “the optimal” ion fluence were examined by scanning electron microscopy energy-dispersive X-ray spectroscopy

• the thickness of the precursor layer on the substrate. (2) Performing SEM imaging of the growth layers, which provide detailed information about the surface structure and composition of the precursor layer. They are essential for understanding how the precursors are decomposed under the following FIB

• becomes the dominant process over structure growth, leading to the erosion of the formed metal-rich deposits. This threshold provides insight into the precursor’s resistance to ion bombardment and is crucial for assessing its stability and reactivity under processing conditions. (4) Collecting SEM EDX

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

• "Higher School of Economics," Moscow, 101000 Russia P. Kapitza Institute for Physical Problems RAS, Moscow, Russia 10.3762/bjnano.16.134 Abstract The superconductor–insulator–normal metal–insulator–superconductor (SINIS) tunnel junction structure is the basic building block for various cryogenic devices

• superconducting quantum interference devices (SQUIDs) and rapid single flux quantum circuits, are based on superconductor–insulator–superconductor (SIS) junctions, another uses superconductor–insulator–normal metal (SIN) junctions. Tunnel junctions based on the SIN structure are widely used, and many different

• quasiparticles out of the normal electrode, which leads to electron cooling, as in a Peltier element. In a single SINIS structure, it is possible to reduce the electron temperature from 260 to 90 mK [31]. Cascaded NIS coolers can be efficient refrigerators for cooling from 1 K to below 100 mK [32]. One of the

PEGylated lipids in lipid nanoparticle delivery dynamics and therapeutic innovation

• Peiyang Gao

Beilstein J. Nanotechnol. 2025, 16, 1914–1930, doi:10.3762/bjnano.16.133

• components plays a specific role in maintaining the nanoparticles’ structure and enhancing their performance [2]. The remarkable success of mRNA-based COVID-19 vaccines has highlighted LNPs as a transformative nanomedicine, driving significant interest and innovation in this field [3]. As a key ingredient in

• review first reveals the localization and conformation of PEG lipids on the LNP surface, which is fundamental for understanding how PEG lipids contribute to nanoparticle stability and surface interactions. It then demonstrates how PEG density and chemical structure may influence the physicochemical

• lipid surface density and structure on LNP physicochemical properties Understanding the spatial organization of lipid components within LNPs is critical for optimizing their physicochemical characterization and stability. In particular, the localization of PEG lipids plays a significant role in

Programmable soliton dynamics in all-Josephson-junction logic cells and networks

• Vsevolod I. Ruzhickiy,
• Anastasia A. Maksimovskaya,
• Sergey V. Bakurskiy,
• Andrey E. Schegolev,
• Maxim V. Tereshonok,
• Mikhail Yu. Kupriyanov,
• Nikolay V. Klenov and
• Igor I. Soloviev

Beilstein J. Nanotechnol. 2025, 16, 1883–1893, doi:10.3762/bjnano.16.131

• . This idea enables us to use the “flaws” of the structure as its important features, opening up a pathway to creating programmable and reconfigurable large circuits. An obvious and widely required application of this technology is in the development of superconductive programmable gate arrays (SPGAs

• , resulting in another full 2π phase advance across the entire line. It is crucial to note that although the absolute phase values accumulate in multiples of 2π throughout this sequence, the physical state of the structure remains unchanged after each full transmission, a direct consequence of the 2π

• periodicity of the Josephson energy. A significant feature of this structure is the ability to disable the diode effect. By increasing the inductance to L/LJ = 3, the device becomes bi-directionally transparent, effectively turning the diode function “off”. This demonstrates how the introduced structural

Low-temperature AFM with a microwave cavity optomechanical transducer

• Ermes Scarano,
• Elisabet K. Arvidsson,
• August K. Roos,
• Erik Holmgren,
• Riccardo Borgani,
• Mats O. Tholén and
• David B. Haviland

Beilstein J. Nanotechnol. 2025, 16, 1873–1882, doi:10.3762/bjnano.16.130

• . Figure 5d–f shows the effect of the measurement bandwidth on a single scan line. Finally, we tested the lateral resolution of our microscope by imaging a less trivial structure. We fabricated a second test sample by etching a pattern from the top Ti layer of a Ti(10 nm)/Au(5 nm)/Ti(5 nm) film deposited