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Search for "aqueous solution" in Full Text gives 445 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
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
- throughout the experimentation. Preparation of nanocomposites The preparation of the blank GluN/Alg nanocomposite involved an ionotropic gelation as outlined in our recent work [25]. In brief, calcium acetate aqueous solution (7.18 mL; 583 mg·mL−1) was gradually mixed with sodium alginate aqueous solution
- (20 mL; 7.0 mg·mL−1) while stirring for 1 h at 1300 rpm. Following overnight settling, the Alg/Ca2+ gelispheres underwent centrifugation at 3000 rpm for 10 min and were washed three times with 10 mL of distilled water each time to remove any impurities. Next, an aqueous solution of GluN (12.0 mL; 1.6
- excess of NaBH4. Initially, 3.0 mg of the AuNPs@GluN/Alg solid was placed in a quartz cell with 1 cm path length, along with an aqueous solution of the organic dyes (2.5 mL, 0.1 mM). Then, 0.5 mL of NaBH4 solution (0.06 M) was added to start the reaction. The reduction process of the dyes was in situ
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
- -linking agent to form a gel-like solution. Then, glucose oxidase is incorporated into the alginate mixture. Next, the mixture is sonicated to evenly distribute the alginate-based nanoparticles in an aqueous solution. Once the nanoparticles are formed, they can be immobilized onto a substrate or electrode
Effect of wavelength and liquid on formation of Ag, Au, Ag/Au nanoparticles via picosecond laser ablation and SERS-based detection of DMMP
Beilstein J. Nanotechnol. 2024, 15, 1054–1069, doi:10.3762/bjnano.15.86
- factor, which could prevent the absorption of the aqueous solution at a given laser wavelength. This approach helps to achieve a delicate balance between maximizing the absorption in the target material while minimizing energy loss in the surrounding liquid and NPs, thereby enhancing the overall
Therapeutic effect of F127-folate@PLGA/CHL/IR780 nanoparticles on folate receptor-expressing cancer cells
Beilstein J. Nanotechnol. 2024, 15, 954–964, doi:10.3762/bjnano.15.78
- emulsion, or nanoprecipitation [1][4], in which copolymers are dissolved in an organic solvent, called the organic phase, and then are put into an immiscible aqueous solution, called the water phase, to form the nanoparticles. Various surfactants, including poly(vinyl alcohol) (PVA), sodium cholate, or
Intermixing of MoS2 and WS2 photocatalysts toward methylene blue photodegradation
Beilstein J. Nanotechnol. 2024, 15, 817–829, doi:10.3762/bjnano.15.68
- absorption peak at 631 nm was used to monitor the concentration of MB in aqueous solution. This peak is commonly associated with photon absorption by the conjugated double bonds of MB molecules. Several measurements conducted on various MB concentrations were analyzed to obtain a correlation between the
Synthesis of silver–palladium Janus nanoparticles using co-sputtering of independent sources: experimental and theorical study
Beilstein J. Nanotechnol. 2024, 15, 808–816, doi:10.3762/bjnano.15.67
- poisoning, resulting in an increase in the useful life of the catalyst. Chunling An et al. synthesized AgPd BNPs in aqueous solution with sizes from 4 to 5 nm and demonstrated that they exhibit greater electrocatalytic activity and better long-term performance than silver nanoparticles [9]. Janus
Electrospun polysuccinimide scaffolds containing different salts as potential wound dressing material
Beilstein J. Nanotechnol. 2024, 15, 781–796, doi:10.3762/bjnano.15.65
- Information File 1, Figure S2). At low salt concentrations, the conductivity in the aqueous solution is directly proportional to the concentration. Table 3 shows that for the samples containing Sr(NO3)2, almost 100% of the salinity was dissolved after 5–8 h. In the case of the Zn(O2CCH3)2 scaffold, only 48
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
- silicon (100) substrates (Siegert Wafer). These substrates were covered with a nucleation layer in the form of gold nanoislands sputtered using a turbomolecular-pumped coater Quorum Q150T ES. CuO films were obtained according to the following procedure. First, an aqueous solution of copper(II) acetate
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
- , available to react with H2O to produce •OH radicals. The electrons in the CB band directly reduce MB to its degradation products or interact with oxygen in the aqueous solution to form peroxy anion radicals (). A part of h+ oxidizes water to form hydroxyl radicals (•OH), or it can oxidize directly MB to its
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
- vitro transdermal delivery and in vivo pharmacokinetic (PK) studies. Materials and Methods Preparation of DCS nanocrystals A saturated DCS aqueous solution was prepared by dissolving 100 mg of DCS powder (Stride Pharma Science Ltd.) in 1 mL of deionized water. Then, 10 mL of the saturated DCS solution
- detection was accomplished with a LYNXEYE detector (Bruker AXS GmbH), and the XRPD patterns were obtained on a D8 ADVANCE (Bruker AXS GmbH). Preparation of different hydrophobic formulations mixed with DCS aqueous solution for the reservoir transdermal delivery The DCS aqueous solution was mixed with
- storage conditions for the formulation of the DSC aqueous solution, and any potential incompatibilities between the DSC aqueous solution and other excipients. We found that without adding NaOH solution to the Formulation Test 2 and 3 in Table 1, the color of the DCS solution changed from colorless to dark
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
- aqueous solution, showing promising prospects for use in magnetically targeted therapy. Determination of photothermal stability and efficiency To evaluate the photothermal performance of the nanostructures, the NPs were irradiated with an 808 nm laser at a power density of 1 W/cm2 for 5 min. A slight
New application of bimetallic Ag/Pt nanoplates in a colorimetric biosensor for specific detection of E. coli in water
Beilstein J. Nanotechnol. 2024, 15, 95–103, doi:10.3762/bjnano.15.9
- spectroscopy (EDS) was used to examine Ag and Pt on the synthesized NPLs (Figure 1b). The percentage of Pt is smaller than that of Ag, indicating that a thin layer of Pt ions has been coated on the surface of Ag NPLs. In the aqueous solution, the Ag/Pt NPLs appear bluish purple. To predict the secondary
- /Pt NPLs A modified chemical reduction method was used to create Ag NPLs [26][38]. The aqueous solution synthesis of Ag-Pt NPL is described below. To begin, 50 L of 0.05 M AgNO3 aqueous solution was mixed with 10 mL of 2.5 × 10−4 M sodium citrate aqueous solution. After that, 25 µL of 0.1 M ascorbic
- acid solution was gradually added to a stirred mixture of sodium citrate and AgNO3. The purple Ag seed solution was then obtained. In addition, 10 mL of 0.05 M AgNO3 aqueous solution was mixed with 20 mL of 0.1 M hexadecyltrimethylammonium bromide (CTAB) aqueous solution. Slowly, 10 mL of 0.1 M
Curcumin-loaded albumin submicron particles with potential as a cancer therapy: an in vitro study
Beilstein J. Nanotechnol. 2023, 14, 1127–1140, doi:10.3762/bjnano.14.93
- solution produced by reverse engineering, and make quality control more challenging [19]. Additionally, the degummed silk tends to aggregate when stored for long periods in an aqueous solution, typically for weeks at room temperature and for months at 4 °C [20]. Amongst various carriers, albumin seems to
- -HSA-MPs yielded CUR concentrations of 0.55–0.60 mg/mL as estimated by absorbance measurements, which is a more than 400-fold increase in solubility compared to free CUR (1.34 µg/mL [8]). Due to its hydrophobic nature, CUR aggregates in aqueous solution and interacts with the hydrophobic clusters of
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- Synthesis method based on urea hydrolysis The synthesis of the CoAl layered double hydroxide phase was carried out by hydrolysis of urea in a two-neck flask (with a reflux condenser) using 50 mL of an aqueous solution of the metal salts at 97 °C for 48 h under Ar atmosphere. The system was continuously
N-Heterocyclic carbene-based gold etchants
Beilstein J. Nanotechnol. 2023, 14, 865–871, doi:10.3762/bjnano.14.71
- reported the use of a benzimidazolium gold complex in dichloromethane (DCM) that readily functionalizes gold nanoparticles (AuNPs) in aqueous solution [15][19]. In our work using solution-based approaches to form NHC monolayers on gold thin films, we observed a loss of gold from our substrates. It is
- aqueous solution with 10 μL of 5.00 × 10−3 M of 1 in THF. No appreciable change in the UV–vis spectrum was observed over 6 h of hourly measurements (Figure 5), indicating no detectable change in diameter (ca. 47 nm) and concentration of the nanoparticles [26]. This is not surprising given the low
Nanostructured lipid carriers containing benznidazole: physicochemical, biopharmaceutical and cellular in vitro studies
Beilstein J. Nanotechnol. 2023, 14, 804–818, doi:10.3762/bjnano.14.66
- (ethylene glycol)) in 20 mL of ultrapure water (Milli-Q®, Millipore, Ma., USA) and was preheated at the same temperature as the melted lipid in the water bath. After 30 min of thermostatization, the aqueous solution was poured over the lipid phase, and ultrasonication was carried out for 20 min at an 80
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
- , an aqueous solution of calcium acetate (14.36 mL; 6.5 mg·mL−1) was slowly added dropwise into an aqueous solution of sodium alginate (40 mL; 7 mg·mL−1) under stirring for 1 h at 1200 rpm. The mixture was allowed to equilibrate overnight. Subsequently, the Alg/Ca2+ spheres were separated by
- centrifugation at 3000 rpm for 10 min and washed three times with distilled water (20 mL each) to remove impurities. Next, an aqueous solution of lactose (16.06 mL, 1.5 mg·mL−1) was added to the Alg/Ca2+ spheres and stirred for 1 h at 1200 rpm. To ensure the formation of a stable gel, the Lac/Alg gel solution
- was ultrasonically treated for 30 min and left to reach equilibrium overnight. After purification, the resulting gel was freeze-dried at −80 °C for 24 h using an EYELA FDU-2110 (Japan) instrument. Next, an aqueous solution of AgNO3 (15 mL) with different concentrations in the range of 7.9–55.6 μg·mL−1
Carboxylic acids and light interact to affect nanoceria stability and dissolution in acidic aqueous environments
Beilstein J. Nanotechnol. 2023, 14, 762–780, doi:10.3762/bjnano.14.63
- interactions play a critical role in biological processes [30]. Nanoceria dissolution Nanoceria dissolution or agglomeration is pH-dependent and influenced by carboxylic acids. Nanoceria dissolution in aqueous solution was shown to be pH-dependent with dissolution occurring at pH values less than 7 [31
- dissolution, since nanoceria particles are known to be photoreduced upon UV radiation exposure, demonstrated by UV exposure of 2 and 9 nm citrate-coated ceria nanoparticles in aqueous solution at pH 6.5 to 7.0 [50] and 3 nm ceria nanoparticles in aqueous solution at pH 2 [51]. Furthermore, this result
Titania nanoparticles for photocatalytic degradation of ethanol under simulated solar light
Beilstein J. Nanotechnol. 2023, 14, 616–630, doi:10.3762/bjnano.14.51
- from the interaction with photogenerated hydroxyl radicals. Despite the fact that radical trapping was performed in aqueous solution, it can be indicative for the ability of the catalyst surface to generate hydroxyl radicals in the present investigated system. The main reactions leading to (•OH
SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms
Beilstein J. Nanotechnol. 2023, 14, 552–564, doi:10.3762/bjnano.14.46
- sapphire wafers. The cut samples were cleaned in organic solvents and rinsed in de-ionized water. Samples were then photoetched in stirred KSO-D solution (0.02 M K2S2O8 + 0.02 M KOH aqueous solution) under illumination of a 300 W UV-enhanced Xe lamp (Oriel, Newport, UK). This photoetching procedure results
Conjugated photothermal materials and structure design for solar steam generation
Beilstein J. Nanotechnol. 2023, 14, 454–466, doi:10.3762/bjnano.14.36
- constructing electron donor–acceptor pairs. Density functional theory (DFT) simulations indicated donor–acceptor interactions between arginine and PDA subunits, including the formation of 5,6-dihydroxyindole (DHI) and indole-5,6-quinone (IQ). Dopamine and arginine were copolymerized in an aqueous solution at
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
- reduction of the GO. A reduced form of GO combined with NiFe was also obtained by others after one-step electrodeposition by cyclic voltammetry [12]. Electrochemical studies of the catalysts towards the OER The electrochemical performance of the catalysts towards the OER was studied in an aqueous solution
- , respectively, on their electrocatalytic performance towards the OER and on the value of Cdl/ECSA. The LSV profiles of NiFe (Qdep: 50–200 mC)-GO recorded in an aqueous solution of 1 M KOH and the corresponding evolution of the OER overpotentials are presented in Figure 6a and Figure 6c, respectively. The graphs
- was the structure of NiFe and the electroactive surface area of GO. Experimental Fabrication of the catalysts NiFe and CoNiFe oxides/(oxy)hydroxides were synthesized in a one-step process by electrodeposition at −1.1 V vs Ag/AgCl in an aqueous solution of 4 mM nickel(II) nitrate hexahydrate (Ni(NO3)2
Plasmonic nanotechnology for photothermal applications – an evaluation
Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33
Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities
Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31
- as described in [59][60] with slight modifications. A solution of 0.1% chitosan (w/v) was prepared in 1% acetic acid solution under stirring at room temperature for about 24 h. Then, the chitosan solution was placed in an ice bath. To this solution, 1 mL of 50 mM AgNO3 aqueous solution was added to
- certain concentrations (50–200 μg/mL) were prepared in DMSO. Each standard solution (100 µL) was then diluted with distilled water (1.8 mL) and mixed with a 2% aqueous solution of anhydrous AlCl3 (100 µL). The obtained mixtures were vortexed. After incubation for 10 min at ambient temperature, absorbances
Polymer nanoparticles from low-energy nanoemulsions for biomedical applications
Beilstein J. Nanotechnol. 2023, 14, 339–350, doi:10.3762/bjnano.14.29
- content is not subject to CC BY 4.0. TEM images and corresponding size distributions of (a) PEGylated polyurethane and (b) lysine-coated polyurea nanocapsules obtained from O/W nanoemulsions in an aqueous solution/polysorbate 80/medium chain triglyceride/diisocyanate system at O/S = 10/90 and 90 wt % of
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