Search results
Search for "iron" in Full Text gives 352 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots
Beilstein J. Nanotechnol. 2024, 15, 475–489, doi:10.3762/bjnano.15.43
- synthesize cobalt ferrite nanoparticles/graphene quantum dots (CF/GQDs). The material was prepared from a homogeneous mixture of iron nitrate, cobalt nitrate, and starch at 140, 180 and 200 °C in a 24 h thermal hydrolysis process. The obtained materials were characterised by using X-ray diffraction, scanning
- (Co(NO3)2·6H2O, 98%), iron(III) nitrate nonahydrate (Fe(NO3)3·9H2O, 98%), and starch ((C6H10O5)n, 98%) were purchased from Merck, Germany. Methylene blue trihydrate (C16H18ClN3S·3H2O), isopropanol (C3H8O), potassium iodide (KI), and potassium bromate (KBrO3) were also purchased from Merck, and
- 100 °C for 24 h to obtain CoFe2O4/GQDs. The material was denoted as CF/GQDs-140, CF/GQDs-180, and CF/GQDs-200, where the numeral symbol presents the hydrolysis temperature. For the sake of comparison, GQDs were synthesized similarly at 200 °C without cobalt and iron. The product mixture was evaporated
Classification and application of metal-based nanoantioxidants in medicine and healthcare
Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36
- employ the properties of transition metals and metal oxides (e.g., cobalt, iron, cerium, and gold), which can generate a cycle of reduction and oxidation stages [20][21][22][23]. Among these metal oxides, cerium oxide-based nanomaterials have been deeply studied with regard to the mechanisms of CAT
- investigated for antioxidant activities. Singh et al. investigated the effect of the Mn3+/Mn2+ ratio on CAT activity [33]. Oxidizing Mn3O4 with NaIO4 yielded a high Mn3+/Mn2+ ratio and enhanced CAT activity compared with that of non-oxidized Mn3O4. Ten different iron oxide-based nanoantioxidants including 6
- -line ferrihydrite, 2-line ferrihydrite, goethite, akageneite, feroxyhyte, hematite, magnetite, maghemite, schwertmannite, and lepidocrocite were compared regarding CAT activity [34]. The highest CAT activity was shown by 2-line ferrihydrite, followed by 6-line ferrihydrite and feroxyhyte. Iron-based
Nanomedicines against Chagas disease: a critical review
Beilstein J. Nanotechnol. 2024, 15, 333–349, doi:10.3762/bjnano.15.30
- also includes cancer imaging and diagnosis such as the MRI imaging agent Resovist, carboxydextran-coated superparamagnetic iron oxide nanoparticles approved for liver contrast-enhanced MRI102 [87]. Another 10% are nanocrystals, such as Tricor (approved in 2004) or Triglide (approved in 2005), used to
Vinorelbine-loaded multifunctional magnetic nanoparticles as anticancer drug delivery systems: synthesis, characterization, and in vitro release study
Beilstein J. Nanotechnol. 2024, 15, 256–269, doi:10.3762/bjnano.15.24
- photothermal therapy on a single platform has been developed in the form of vinorelbine-loaded polydopamine-coated iron oxide nanoparticles. Vinorelbine (VNB) is loaded on the surface of iron oxide nanoparticles produced by a solvothermal technique after coating with polydopamine (PDA) with varying weight
- , magnetic response, and controlled drug release with photothermal effect brings a different perspective to advanced cancer treatment research. Keywords: drug efficacy; iron oxide nanoparticles; photothermal; solvothermal method; Introduction Cancer is a widespread condition characterized by the
- , as they increase permeability and retention effect in solid tumors, enabling precise application to the targeted cells. Various structures such as silica-based conjugates, inorganic polymers, ceramic nanomaterials, gold, iron oxide, and noble metal nanoparticles have been utilized [9][10]. Among the
Multiscale modelling of biomolecular corona formation on metallic surfaces
Beilstein J. Nanotechnol. 2024, 15, 215–229, doi:10.3762/bjnano.15.21
- containers, metal-based equipment, and kitchen utensils in maintaining product integrity. The figure further demonstrates the potential to introduce heavy metal contamination, including iron and aluminum, during processing and emphasizes the formation of a milk layer in form of a protein/lactose corona at
- different facets of the aluminum surface (100, 110, and 111) in a bar chart. A comparison of the adsorption energies on aluminum and iron surfaces reveals distinct preferences for different AAs. On aluminum surfaces, ARG, PRO, TRP, TYR AAs show the strongest attraction (−63.32kBT to −41.46kBT), followed by
- HIE, GLN, PHE, GAN (−43.86kBT to −20.85kBT). VAL, THR, SER, CYS, ALA exhibit the weakest attraction (−19.51kBT to −1.76kBT). On iron surfaces, charged and aromatic PRO, TYR, ARG, HIS AAs are strongly adsorbed (−91.29kBT to −43.34kBT), while hydrophobic VAL, LEU, ALA AAs show a weaker adhesion
Nanocarrier systems loaded with IR780, iron oxide nanoparticles and chlorambucil for cancer theragnostics
Beilstein J. Nanotechnol. 2024, 15, 180–189, doi:10.3762/bjnano.15.17
- nanocarrier that can be loaded with the chemotherapeutic medication chlorambucil and magnetic resonance imaging agents (e.g., iron oxide nanoparticles and near-infrared fluorophore IR780) for theragnostics. Poly(lactic-co-glycolic acid) was combined with the aforementioned ingredients to generate poly(vinyl
- alcohol)-based nanoparticles (NPs) using the single emulsion technique. Then the NPs were coated with F127 and F127-folate by simple incubation for five days. The nanoparticles have the hydrodynamic size of approx. 250 nm with negative charge. Similar to chlorambucil and IR780, iron oxide loadings were
- of these systems to serve as medication and imaging agent carriers for cancer treatment and diagnostics, respectively. Keywords: cancer; chlorambucil; F127-folate; IR780; iron oxide nanoparticles; PLGA; theragnostics; Introduction Theragnostic nanoparticles (NPs) are a diagnostic and therapeutic
Assessing phytotoxicity and tolerance levels of ZnO nanoparticles on Raphanus sativus: implications for widespread adoptions
Beilstein J. Nanotechnol. 2024, 15, 115–125, doi:10.3762/bjnano.15.11
- to more stable and less available solid forms by forming complexes with oxides such as aluminum or iron, or by precipitating as Zn carbonate [7]. The recommended Zn level needed for the majority of crops to be healthy ranges from 30 to 200 μg Zn g−1 dry weight (DW) of plants [8]. Therefore, the
Berberine-loaded polylactic acid nanofiber scaffold as a drug delivery system: The relationship between chemical characteristics, drug-release behavior, and antibacterial efficiency
Beilstein J. Nanotechnol. 2024, 15, 71–82, doi:10.3762/bjnano.15.7
- , iron oxide, and mesoporous silica nanoparticles) [4]. Additionally, nanocarrier-free systems, such as drug nanocrystals, are also used to improve the delivery of poorly soluble drugs [5][6]. In our previous study, the saturation concentration of BBR in water was 2.0 mg/mL, while BBR nanoparticles
TEM sample preparation of lithographically patterned permalloy nanostructures on silicon nitride membranes
Beilstein J. Nanotechnol. 2024, 15, 1–12, doi:10.3762/bjnano.15.1
- –iron alloy (80 atom % Ni and 20 atom % Fe) that has a small coercive field (Hc) [17] and low magnetostriction (λs) [18], as well as high permeability and high saturation magnetization (Ms) [19]. TEM offers high spatial resolution for magnetic imaging. TEM-based magnetic imaging techniques such as
- or volatile particles, which can be pumped out. RIE of nickel–iron alloys has been carried out using inductively coupled plasma RIE with argon and chlorine [34] or with NH3 and CO [35]. Stencil lithography requires further optimization although possible applications are attractive because of the
Recognition mechanisms of hemoglobin particles by monocytes – CD163 may just be one
Beilstein J. Nanotechnol. 2023, 14, 1028–1040, doi:10.3762/bjnano.14.85
- central iron ion is trivalent, and the Hb derivative has lost its ability to bind oxygen. Therefore, only bivalent Hb is functional. The “oxygen release method” was used to determine the percentage of functional hemoglobin, as previously described in detail by Kloypan and co-workers [33]. In brief, the
Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays
Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82
- , iron oxide nanoparticles are the most prominent ones because of their biocompatibility, low toxicity, ease of synthesis, and high photothermal conversion efficiency. The influence of a magnetic field can also increase temperature generation by such nanoparticles, which is called magnetic hyperthermia
- . Since iron oxide nanoparticles absorb in the NIR region, irradiating them with a proper source will produce heat, which makes them suitable for theranostic purposes [32][42][43]. Carbon nanomaterials: Carbon-based materials have been identified as promising candidates for photothermal applications
- a low-power laser source. In a multimodal system of gold, iron oxide, and graphene oxide (GO) nanoparticles, the photothermal properties of graphene, the magnetic properties of iron oxide, and the surface plasmon resonance of gold enable multiple functions in a single system. The presence of gold
Green SPIONs as a novel highly selective treatment for leishmaniasis: an in vitro study against Leishmania amazonensis intracellular amastigotes
Beilstein J. Nanotechnol. 2023, 14, 893–903, doi:10.3762/bjnano.14.73
- The main goal of this work was to evaluate the therapeutic potential of green superparamagnetic iron oxide nanoparticles (SPIONs) produced with coconut water for treating cutaneous leishmaniasis caused by Leishmania amazonensis. Optical and electron microscopy techniques were used to evaluate the
- effort on the search for new treatments for different diseases. Its main objective is to develop therapies with higher specificity, effectiveness, and safety, as well as less toxicity [6]. One interesting class of nanomaterials in medicine are superparamagnetic iron oxide nanoparticles (SPIONs). SPIONs
- , arrowheads). The ferrous nature of the observed structures was assessed by chemical element mapping analysis using energy-dispersive X-ray spectroscopy (Figure 2C), confirming that the electron-lucent structures contain iron atoms (Figure 2D). Transmission electron microscopy (TEM) was used to confirm the
Biomimetics on the micro- and nanoscale – The 25th anniversary of the lotus effect
Beilstein J. Nanotechnol. 2023, 14, 850–856, doi:10.3762/bjnano.14.69
- be solved was to protect copper air delivery tubes from molten iron during the smelting process. The initial concept was to maintain a layer of air between the vulnerable copper surface and the molten iron. The obvious archetypes, Salvinia and Collemba, which do something similar in their natural
Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review
Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52
ZnO-decorated SiC@C hybrids with strong electromagnetic absorption
Beilstein J. Nanotechnol. 2023, 14, 565–573, doi:10.3762/bjnano.14.47
- diversification of working conditions, new electromagnetic (EM) absorbing materials are gradually designed and fabricated to obtain thinner, lighter, wider, and stronger materials than the traditional materials such as carbonyl iron and ferrite [1][2][3][4]. SiC has the advantages of low density, high-temperature
Specific absorption rate of randomly oriented magnetic nanoparticles in a static magnetic field
Beilstein J. Nanotechnol. 2023, 14, 485–493, doi:10.3762/bjnano.14.39
- simulations using the stochastic Landau–Lifshitz equation are performed to study magnetization dynamics of dilute assemblies of iron oxide nanoparticles exposed to an alternating (ac) magnetic field with an amplitude Hac = 200 Oe and a frequency f = 300 kHz and a static (dc) magnetic field in the range Hdc
- hyperthermia; magnetic nanoparticles; magnetic particle imaging; specific absorption rate; static magnetic field; Introduction Magnetic nanoparticles, mainly iron oxides, are promising materials for the diagnosis and therapy of oncological diseases [1][2][3]. Important fields of application of magnetic
- of non-interacting magnetic nanoparticles of iron oxide is considered in a wide range of particle diameters, D = 18–50 nm. The SAR of the assembly is calculated depending on the amplitude and direction of the dc magnetic field in the range Hdc = 0–800 Oe. The spatial distribution of the assembly SAR
Mixed oxides with corundum-type structure obtained from recycling can seals as paint pigments: color stability
Beilstein J. Nanotechnol. 2023, 14, 467–477, doi:10.3762/bjnano.14.37
- , Guarapuava, 85040-167, Brazil 10.3762/bjnano.14.37 Abstract Green chromium and red iron oxides are technically important pigments due to their high color intensity, good dispersibility in paints, and superior hiding power. We report on the synthesis of colored pigments of mixed oxides with a corundum-type
- structure. The pigments are obtained via the addition of coloring ions to boehmite from recycled metallic aluminium. X-ray diffractometry (XRD) and Raman spectroscopy confirmed the crystallographic phase. Additionally, the oxidation state 3+ responsible for the greenish (chromium) and reddish (iron
- atmospheres than organic pigments [12]. In addition, inorganic pigments offer the advantage of lower production cost [12] when using recycling materials as a precursor. Global demand for pigments was around 12 million tons in 2020 and is dominated by titanium dioxide white pigment [11]. However, iron oxide
Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction
Beilstein J. Nanotechnol. 2023, 14, 420–433, doi:10.3762/bjnano.14.34
- Cracow, Poland 10.3762/bjnano.14.34 Abstract In this work, the specific role of the addition of graphene oxide (GO) to state-of-the-art nickel–iron (NiFe) and cobalt–nickel–iron (CoNiFe) mixed oxides/hydroxides towards the oxygen evolution reaction (OER) is investigated. Morphology, structure, and OER
- and expensive metals [5], studies on other catalyst materials are being conducted. Recently, transition-metal-based materials including nickel, iron, and/or cobalt have become promising catalysts for OER [6][7][8][9][10]. The materials are characterized by relatively low cost and environmentally
- elements in the catalyst structure: Ni and Fe for NiFe and NiFe-GO, and Ni, Fe, and Co for CoNiFe and CoNiFe-GO. A high amount of detected nickel is due to the presence of nickel in the catalyst but also in the nickel substrate. Since an extremely low atom % fraction of iron in NiFe-GO was detected
Recent progress in cancer cell membrane-based nanoparticles for biomedical applications
Beilstein J. Nanotechnol. 2023, 14, 262–279, doi:10.3762/bjnano.14.24
- oxidation, which leads to a decrease in heating efficiency [100]. In addition, magnetic NPs are usually recognized and cleared from the body, which prevents them from reaching their target [101]. Biomimetic cancer cell membrane technology can enhance the performance of magnetic iron oxide NPs (e.g., prevent
- oxidation, improve biocompatibility, enhance colloidal stability, and enhance targeting), enabling the ablation of tumor tissues by thermal energy [79]. MDA-MB-231 cell membrane-coated NPs loaded with superparamagnetic iron oxide nanoparticles (SPIONs) and PTX were designed for the combination treatment of
- development of cells and plays an important regulatory role in the progression of cancer [104][105]. Iron-dependent ferroptosis is a new type of programmed cell death that is different from other modes of action and molecular mechanisms. It is characterized by mitochondrial lipid peroxidation and reduced
Nanotechnology – a robust tool for fighting the challenges of drug resistance in non-small cell lung cancer
Beilstein J. Nanotechnol. 2023, 14, 240–261, doi:10.3762/bjnano.14.23
- , gold nanoshells, and microbots) and imaging contrast nanoparticles (quantum dots and iron oxide), after homing into the tumor environment [113]. Xu et al. described an injectable nanoparticle generator (iNPG) showing substantial natural tumor tropism designed as aminopropyltriethoxysilane (APTES
Gap-directed chemical lift-off lithographic nanoarchitectonics for arbitrary sub-micrometer patterning
Beilstein J. Nanotechnol. 2023, 14, 34–44, doi:10.3762/bjnano.14.4
- purchased from Echo Chemical (Taipei, Taiwan). Hexamethyldisilazane (HMDS) was purchased from Sigma-Aldrich (St Louis, MO, USA). Iron nitrate and thiourea were purchased from Showa Chemical Industry Co., Ltd. (Tokyo, Japan). Positive photoresist AZ6112 was purchased from AZ Electronic Materials Taiwan Co
- structure characterization To transfer chemical patterns created by CLL to the underneath metal layer, a wet chemical etching process was adopted. After lifting the PDMS stamp from a SAM-modified Au substrate, the Au surface was immersed in an aqueous mixture containing 40 mM iron nitrate and 60 mM thiourea
- lift-off surface can serve as the molecular resist for the underneath material structure transfer. This concept is demonstrated by immersing a post-lift off surface in an aqueous mixture containing iron nitrate and thiourea for wet chemical etching (Figure 3A). The absence of SAM molecule protection at
Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition
Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2
- of Sciences, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS − Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex, France 10.3762/bjnano.14.2 Abstract Different iron oxides (i.e., magnetite, maghemite, goethite
- mol of acetylacetonate and up to 5.5 mol/mol. Below the mentioned limit, NPM dispersions were colloidally unstable, and at higher ratios no NPM were formed which could be precipitated by an applied magnetic field. Monodisperse nanoparticles of iron oxides were synthesized with a diameter of 8–13 nm
- . Keywords: Fe(III) acetylacetonate; iron oxide nanoparticles; maghemite; magnetic nanoparticles; magnetite; thermal decomposition synthesis; Introduction Magnetic nanoparticles are increasingly being used in various fields thanks to the recent progress in their controlled synthesis and knowledge of their
Non-stoichiometric magnetite as catalyst for the photocatalytic degradation of phenol and 2,6-dibromo-4-methylphenol – a new approach in water treatment
Beilstein J. Nanotechnol. 2022, 13, 1531–1540, doi:10.3762/bjnano.13.126
- the mixed and variable valency of iron in its structure (Fe(III)tet[Fe(II),Fe(III)]octO4), this oxide has unique properties [13][14]. At room temperature, magnetite is an inverse spinel conductor with Fe3+ on the tetrahedral sites and Fe2+ and Fe3+ on the octahedral sites. Electron hopping along the
- octahedral iron chain handles its conductivity and redox properties, causing the magnetite to initialize oxidation/reduction reactions. Fe3O4 nanoparticles have been used as a photocatalyst for the degradation of azo dyes [15], for wastewater treatment [16][17], for water decomposition, and for Cr(VI
- transferred with very low activation energy among iron ions on the octahedral sites. As we showed above, DBMP interacts with the magnetite surface, thus, it can react with the generated electrons. The following reaction path for DBMP degradation is proposed to explain our observations (a detailed description
Straight roads into nowhere – obvious and not-so-obvious biological models for ferrophobic surfaces
Beilstein J. Nanotechnol. 2022, 13, 1345–1360, doi:10.3762/bjnano.13.111
- iron. Therefore, biological external surfaces that strongly repel liquids appeared to be suitable, particularly the hair cover of the water fern Salvinia molesta and the surface of Collembola (an arthropod group). It turned out, however, that it was not feasible to realise the functional structures of
- able to create stable air bodies, which support the refilling of embolised conduits. By adopting the shape of these micropores, a successful prototype for a ferrophobic copper surface repelling liquid iron could be devised. This case study illustrates that straight road maps from technical problems to
- projects. The actual project, whose history will be reconstructed in this contribution and in which two co-authors participated (C. N. and W. K.), dealt with a technical problem encountered during steel production. The aim was to find a (biomimetic) way to prevent the adhesion of liquid iron at 1500 °C to
Recent trends in Bi-based nanomaterials: challenges, fabrication, enhancement techniques, and environmental applications
Beilstein J. Nanotechnol. 2022, 13, 1316–1336, doi:10.3762/bjnano.13.109
- [84][85]. Using a straightforward hydrothermal procedure, Hu et al. produced iron-doped Bi2WO6 nanocomposites [84]. In comparison to pristine Bi2WO6, Fe-doped Bi2WO6 exhibits superior visible-light photoabsorption, a considerably increased number of oxygen vacancies, and a noticeably improved capacity
Other Beilstein-Institut Open Science Activities
