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Search for "gel" in Full Text gives 384 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Orientation-dependent photonic bandgaps in gold-dust weevil scales and their titania bioreplicates
Beilstein J. Nanotechnol. 2025, 16, 1–10, doi:10.3762/bjnano.16.1
- }-oriented domains exhibits polarization conversion, rotating the angle of linearly polarized light. The overall coloration, resulting from the reflections from many scales, is close to uniformly diffuse because of the random orientation of the domains. Using titania sol–gel chemistry, we produced negative
- of 1.55 to 2.00. The study suggests that the effective refractive index of titania in the 3D lattice is similar to that in sol–gel films. The study demonstrates the potential of replicating complex biophotonic structures using the sol–gel technique. Optimization of the sol–gel process could lead to
- customizable photonic bandgaps that might be used in novel optical materials. Keywords: animal coloration; photonic crystal; polarization conversion; sol–gel replication; weevil; Introduction Animal coloration is produced by means of absorption, scattering, luminescence, and interference. The latter is
Fabrication of hafnium-based nanoparticles and nanostructures using picosecond laser ablation
Beilstein J. Nanotechnol. 2024, 15, 1639–1653, doi:10.3762/bjnano.15.129
- desired morphology is essential for a given application. Generally, practical techniques for obtaining nanomaterials are sol–gel method, chemical and physical vapour deposition, hydrothermal method, ball milling, grinding, lithography, etching, and laser ablation [14][15][16][17][18]. The morphology
Natural nanofibers embedded in the seed mucilage envelope: composite hydrogels with specific adhesive and frictional properties
Beilstein J. Nanotechnol. 2024, 15, 1603–1618, doi:10.3762/bjnano.15.126
- . Natural hydrogels share some features with synthetic hydrogels, but are more easy to obtain and recycle. One of the main sources of such hydrogels are mucilaginous seeds and fruits, which produce after hydration a gel-like, transparent capsule, the so-called mucilage envelope. Mucilage serves several
- . Macroscopically observable mucilage is often a transparent, gel-like capsule formed around the diaspore after hydration with water (Figure 1). At the microscale mucilage exhibits, before hydration, successive layers formed by adcrustation in the mucilaginous cells of the seed/fruit coat (the outermost covering of
- tasteless [11][21]. Its chemical composition and special physical properties allow many applications of mucilage, for example, as thickening and structuring (gel-forming) agent, emulsifier or stabiliser for food products, scaffold for tissue regeneration, additive in formation of medicinal tablets, and for
Polymer lipid hybrid nanoparticles for phytochemical delivery: challenges, progress, and future prospects
Beilstein J. Nanotechnol. 2024, 15, 1473–1497, doi:10.3762/bjnano.15.118
- reduced the IC50 value against different BC cells. When administered orally to Wistar rats, the THQ-PLHNPs revealed a 4.74-fold increase in bioavailability compared to pure THQ suspension. Trivedi et al. investigated the therapeutic potential of THQ-PLHNPs-based gel to achieve better therapeutic activity
- against BC [101]. The developed THQ-PLHNPs gel showed much higher skin permeation and retention compared to the conventional THQ gel. The THQ-PLHNPs were non-irritant when applied to the skin. Furthermore, the developed gels showed higher antiproliferative activity against MCF-7 and MBD-MB-231 cells than
- HPN dispersion. The developed HPN-cPLHNPs gels showed much better wound healing activity with a significantly higher reduction in wound size after topical application for 14 days in comparison with the conventional HPN gel. Emodin Emodin (EDN) is a natural anthraquinone compound found in various
Mn-doped ZnO nanopowders prepared by sol–gel and microwave-assisted sol–gel methods and their photocatalytic properties
Beilstein J. Nanotechnol. 2024, 15, 1283–1296, doi:10.3762/bjnano.15.104
- 10.3762/bjnano.15.104 Abstract Although the microwave-assisted sol–gel method is quite frequently used for the preparation of oxide nanostructures, the synergism of the reaction pathways is not fully explained. However, state-of-the-art theoretical and practical results of high novelty can be achieved by
- continuously evaluating the as-synthesized materials. The present paper presents a comparative study of Mn-doped ZnO nanopowders prepared by both sol–gel and microwave-assisted sol–gel methods. The structural, morphological, and optical properties of the as-obtained powders were established and correlated with
- preferred for synthesizing oxide nanostructures because of their advantages, such as uniform mixing of precursors at the molecular level, low operating temperatures, and the ability to control the physicochemical properties of the final products [5][6]. Among various chemical techniques, the sol–gel method
Dual-functionalized architecture enables stable and tumor cell-specific SiO2NPs in complex biological fluids
Beilstein J. Nanotechnol. 2024, 15, 1238–1252, doi:10.3762/bjnano.15.100
- corona formation in cell culture medium and human plasma To verify the adsorption of proteins on the functionalized SiO2NPs, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) experiment was performed. For this, the nanomaterials (in concentrations of 2 to 5 mg·mL–1) were incubated in
- ) and was repeated four times. Then, Laemmli buffer (1610737, Bio-Rad) containing 50 mM of dithiothreitol (DTT, 1610611, Bio-Rad) was added to the final precipitate, followed by heating at 95 °C for 5 min, and 10 μL of this suspension was applied in a 12% SDS-PAGE gel. The gel was run at a voltage of
- 200 V for 1 h and then the gel was stained with silver nitrate to visualize the bands. PageRuler™ Prestained Protein Ladder (Thermo Scientific) was used as a standard. The DMEM culture medium used for SiO2NP incubation was also added to the gel for comparison purposes. To determine the total protein
Enhanced catalytic reduction through in situ synthesized gold nanoparticles embedded in glucosamine/alginate nanocomposites
Beilstein J. Nanotechnol. 2024, 15, 1227–1237, doi:10.3762/bjnano.15.99
- electrostatic bonds with multivalent metal cations (such as Ca2+, Ba2+, and Cu2+) to create an extensive gel network in water [15][16]. The cross-linking of saccharide chains within alginate generates macromolecules ranging in size from micrometers to millimeters, resulting in gelispheres insoluble in water
- mg·mL−1) was added to the Alg/Ca2+ gelispheres and stirred for 1 h at 1300 rpm. The resulting GluN/Alg suspension underwent ultrasonication for 30 min and was left overnight to ensure the formation of a stable gel. The resulting nanocomposite mixture was centrifuged at 3000 rpm for 10 min and washed
- parameters, the synthesis of AuNPs@GluN/Alg was fine-tuned to determine the optimal conditions. The impact of the mass ratio between metallic ions and GluN/Alg gel was investigated at levels of 1%, 3%, 5%, 7%, and 9% (w/w). The reaction temperature ranged from 30 to 90 °C, while the reaction time varied from
Unveiling the potential of alginate-based nanomaterials in sensing technology and smart delivery applications
Beilstein J. Nanotechnol. 2024, 15, 1077–1104, doi:10.3762/bjnano.15.88
- result, several researchers are working on alginate to create nanoparticles. One of the most appealing properties of alginate is its capacity to readily form a gel with divalent cations, particularly Ca2+ [31]. Divalent cations create hydrogen bonds with the alginate G residues, resulting in an egg-box
- gel structure. As a result, the viscosity and other mechanical qualities of alginate can be enhanced, allowing for the formation of a hydrogel. The attractive properties of alginate include low cost, abundance, biocompatibility, biodegradability, antibacterial activity, non-toxicity, and the ease to
- properties. Oxidative and sensitive materials are loaded into sodium alginate gel, and the absence and concentration of hydrogen peroxide in water and milk can be analyzed by a colorimetric method [117]. In another work, an alginate hybrid silver magnetite nanocomposite (Fe3O4@AMALG12@Ag) with enhanced
Interface properties of nanostructured carbon-coated biological implants: an overview
Beilstein J. Nanotechnol. 2024, 15, 1041–1053, doi:10.3762/bjnano.15.85
- PVD, CVD, and sol–gel deposition of NDs on ceramics, together with excellent adhesion of the protective layer [143][144]. Chernysheva et al. [145][146] investigated the production of protective ND layers onto a xenogenic heart valve, evaluating the role of the ND surface potential. A negative surface
Facile synthesis of Fe-based metal–organic frameworks from Fe2O3 nanoparticles and their application for CO2/N2 separation
Beilstein J. Nanotechnol. 2024, 15, 897–908, doi:10.3762/bjnano.15.74
- , yielding 82% and a BET surface area of 2050 m2·g−1 [20]. Since then, various green synthetic routes from ferric nitrate and metallic iron powder have been developed for generating MIL-100(Fe), including low-temperature synthesis [21], solvent-free synthesis [22], and dry gel conversion pathway [23]. It
Electrospun polysuccinimide scaffolds containing different salts as potential wound dressing material
Beilstein J. Nanotechnol. 2024, 15, 781–796, doi:10.3762/bjnano.15.65
- that the scaffolds (6 mm in diameter) shrank during the incubation period on the agar gel, which was also observed in the case of electrospun scaffolds under certain conditions [70]. The specific antibacterial areas were defined (Table 5) by the diameter of the fibrous samples and the inhibition
Effect of repeating hydrothermal growth processes and rapid thermal annealing on CuO thin film properties
Beilstein J. Nanotechnol. 2024, 15, 743–754, doi:10.3762/bjnano.15.62
- thin films can also be grown from liquid phases, employing techniques such as chemical bath deposition [31][32][33], successive ionic layer adsorption and reaction (SILAR) [34][35][36], sol–gel processes (using dip and spin coating) [37][38][39], as well as spray pyrolysis [40][41][42]. This work
Simultaneous electrochemical determination of uric acid and hypoxanthine at a TiO2/graphene quantum dot-modified electrode
Beilstein J. Nanotechnol. 2024, 15, 719–732, doi:10.3762/bjnano.15.60
- lithium-ion storage performance of C-GQDs/α-Fe2O3 composites in lithium batteries presented excellent cyclability and rate capability [19]. Among several chemical approaches for the synthesis of titania, sol–gel processes have been commonly used for practical application. In these sol–gel methods
Gold nanomakura: nanoarchitectonics and their photothermal response in association with carrageenan hydrogels
Beilstein J. Nanotechnol. 2024, 15, 678–693, doi:10.3762/bjnano.15.56
- ]. A very recent study reported photothermal effect of gold nanorods of shorter and longer lengths in gel and aqueous media [18]. In recent times, anisotropic nanoparticles due to their unique physicochemical properties have garnered attention among researchers and enabled them to manoeuvre into an
- within the gel matrix since the concentration of AuNMs and AuNRs incorporated into the k-CG hydrogels was the same. Therefore, it can be assumed that AuNMs due to their outward concave growth at the edges provided more surface area and greater stability in k-CG hydrogels, leading to greater photothermal
- suspension were measured for 20 min each. Experimental setup for photothermal response measurement of AuNMs incorporated gel beads For the temperature increase measurement of AuNMs incorporated gel bead samples (powder form), the experiments were performed by using a 20 mg powder placed in 1.5 mL conical
Cholesterol nanoarchaeosomes for alendronate targeted delivery as an anti-endothelial dysfunction agent
Beilstein J. Nanotechnol. 2024, 15, 517–534, doi:10.3762/bjnano.15.46
- through 0.4 μm and 0.2 μm pore size polycarbonate filters using a thermobarrel extruder (Northern Lipids, Inc. BC, Canada). Free ALN was removed by gel filtration on Sephadex G-50. Briefly, aliquots of 300 μL of nanovesicles were poured on a 3 mL syringe packed with Sephadex G-50, centrifuged for 5 min at
Fabrication of nanocrystal forms of ᴅ-cycloserine and their application for transdermal and enteric drug delivery systems
Beilstein J. Nanotechnol. 2024, 15, 465–474, doi:10.3762/bjnano.15.42
- suspended in liquid (i.e., the compounds became an emulsion solution or suspension liquid) or gel form [30]. Deionized water was used as a receptor medium for drug penetration tests [31][32]. To study the in vitro release of DCS in different crystal forms, the reservoir transdermal delivery system was used
Determining by Raman spectroscopy the average thickness and N-layer-specific surface coverages of MoS2 thin films with domains much smaller than the laser spot size
Beilstein J. Nanotechnol. 2024, 15, 279–296, doi:10.3762/bjnano.15.26
Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites
Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16
- after drying the solution in a heating oven. Vinyltriethoxysilane was used to modify GO [25][32] and it was bonded on the GO surface by the sol–gel method, as shown in Figure 1. Firstly, GO (0.4 g) was thoroughly dispersed in distilled water. After that, VTES (1.8 g) was added to the mixture, followed
Elasticity, an often-overseen parameter in the development of nanoscale drug delivery systems
Beilstein J. Nanotechnol. 2023, 14, 1149–1156, doi:10.3762/bjnano.14.95
- enhanced tumor accumulation and deeper penetration of nanolipogels (NLGs) [32]. The particles had a phospholipid double layer and except for the softest formulation, their cores were filled with agarose gels of different gel strength values. With this method they were able to prepare nanoparticles with
A visible-light photodetector based on heterojunctions between CuO nanoparticles and ZnO nanorods
Beilstein J. Nanotechnol. 2023, 14, 1018–1027, doi:10.3762/bjnano.14.84
- ) solution in an oven at 95 °C within 3 h (as presented in Supporting Information File 1, Figure S1). CuO NPs were synthesized via a simple and low-cost sol–gel method. At first, a mixture of 1.21 g Cu(NO3)2·5H2O and 0.8 g NaOH was dissolved in 50 mL deionized water under constant stirring at room
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- ], sol–gel methods [26], mechanochemistry [27], or the epoxide route [28], to name a few [29]. Among them, hydrothermal methods based on ammonium-releasing reagents (ARRs), commonly urea or hexamethylenetetramine, are especially interesting since they allow one to obtain large and highly crystalline
A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection
Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67
- are welded onto the edges of the copper foil. In the mold shown in Figure 2, a thin layer of silica gel is injected and left to stand until it is dry. The nanofilm attached to the electrode is then placed in the mold, and an appropriate amount of silica gel is slowly injected until the film is
- sensor after bending. It was observed that the sensor encapsulated by silica gel was highly flexible and could fit snugly onto the skin. Additionally, the food-grade silica gel used in the outermost layer is ecologically friendly, harmless to human health, and makes for a great wearable, flexible
- piezoelectric nanoscale heart sensor, and the outermost layer of silica gel effectively protected the flexible nanofilm and adhered to the skin. In this paper, the acoustic-electric conversion performance of P(VDF-TrFE)/ZnO/GR piezoelectric composite films was evaluated using a self-built acoustic-electric
Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity
Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64
- , as evidenced by the absence of any notable change in λmax values. To investigate the influence of the reaction time, the gel Ag+@Lac/Alg was heated at a solution temperature of 90 °C and the UV–vis spectra were measured every 20 min. As seen in Figure 2C and Figure 2D, the formation of AgNPs in the
- values up to 140 min. Throughout the synthesis process, the λmax values showed a slight increase, which confirms the critical role of reaction time in the synthesis of stable nanocomposites. To assess the impact of silver ion concentration, ratios of silver ions to gel in the range of 0.1–0.7 (w/w) were
- the morphology of the nanocomposite in different media. At pH 4, AgNPs aggregated to form larger particles compared to those formed at pH 6. In contrast, at pH 12, the nanocomposite was disrupted, leading to the aggregation of gel and a reduced interaction between AgNPs and the bacterial cell wall
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
Carbon nanotube-cellulose ink for rapid solvent identification
Beilstein J. Nanotechnol. 2023, 14, 535–543, doi:10.3762/bjnano.14.44
- length was purchased from Maine University (3.0 wt % aqueous gel) [58]. Further characterizations and information about the MFC can be found in [58]. Functionalized multiwalled carbon nanotubes (MWCNTs) with hydroxy and carboxyl groups (–OH and –COOH), outer diameter between 20 and 50 nm and an average
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