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Search for "particle size" in Full Text gives 579 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Upscaling the urea method synthesis of CoAl layered double hydroxides
Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76
- alkalinization rate, which (mainly) controls the nucleation and growth processes, and therefore particle size, morphology, and crystallinity [33][36][37]. Attempts to upscale the production of LDHs included incrementing the concentration of the reactants [38][39], the use of large-scale reactors [40][41], byway
- concentration increase (x25M), the formation of a simonkolleite-like Co-based layered hydroxide impurity is observed, indicating phase competition during precipitation related to the thermodynamic stability of the growing phases. In the case of the volumetric scale-up, a reduction of ca. 45% of the particle
- size is observed as the volume increases. This feature is related to changes in the heating process (heat transfer) modifying the alkalinization kinetics and the concomitant precipitation process, even after 48 h of recrystallization. These results suggest that the final LDH morphology (size and
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
- bottle was sealed and placed in a shaking mixer and shaken for 3 h. Next, ZnO nanoparticles (Shanghai Keyan Industrial Co., Ltd., particle size 3 ± 5 nm, content ≥99.8%) and GR filler (Shenzhen Turing Evolution Technology Co., Ltd., carbon content 98%, average diameter/thickness ratio = 9500) were added
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
- ] software showed a mean particle size of 150 ± 13 nm. Accordingly, the hydrodynamic diameter of the nanoparticles measured by dynamic light scattering (DLS) was in the 100–200 nm range (≈150 nm), with a moderate distribution of sizes as indicated by a polydispersity index (PdI) of 0.204. The zeta potential
- this description has its limitations, it has been widely used to describe drug release from similar lipidic formulations [35][36][37][38]. The mean particle size, PdI, zeta potential, and encapsulation efficiency were selected as parameters to follow the physical stability of the nanoparticle
- with acceptable particle size, PdI, and EE%. Complementary to these results, TEM images showed a spherical configuration. Thermal and crystallographic experiments indicated that BNZ was dispersed into the lipid matrix. The formulations showed a sustained drug release profile for 24 h, achieving a
Silver-based SERS substrates fabricated using a 3D printed microfluidic device
Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65
- the Ag particles become smaller when the size of the particles increases, resulting in a stronger hot spot effect. However, when the particle size exceeds a critical threshold, the Ag particles come into contact with each other, causing the hot spots to dissipate. Based on these findings, we selected
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
- different magnifications and particle size distributions of AgNPs@Lac/Alg-0.3 (A, B and C) and AgNPs@Lac/Alg-0.7 (D, E and F). Proposed mechanism of AgNPs@Lac/Alg catalysis in reduction of methyl orange and rhodamine B using NaBH4. UV–vis spectra of the catalyst at concentrations of 1.0 μg/mL (A), 2.0 μg/mL
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
- Table 2 of Grulke et al. [34], changes in the valence state at the edge and core of the nanoparticles were shown over twelve weeks of dissolution. The Ce3+ concentration increased as the particle size decreased, but only slightly. Figure 7 of Yokel et al. [33] shows little to no change within four weeks
- following identifies the members of the five groups and describes their effect on nanoceria dissolution/stability. Group one includes nanoceria exposed to citric, malic, and isocitric acid. For all three samples stored in the dark, there was an immediate reduction in hydrodynamic particle size, followed by
- slow dissolution over time. The solution color remained yellow for the experimental duration. For the samples exposed to light, there was an immediate reduction in hydrodynamic particle size accompanied by a color change from yellow to clear. The nanoceria particles decreased to 8.4, 7.3, and 10.9 nm
In situ magnesiothermic reduction synthesis of a Ge@C composite for high-performance lithium-ion batterie anodes
Beilstein J. Nanotechnol. 2023, 14, 751–761, doi:10.3762/bjnano.14.62
- microscopy (HR-TEM, JEOL JEM-2100F) were conducted for morphology and particle size investigation. A well-blended mixture of active material, conductive carbon C65, and polyvinylidene fluoride (PVDF) binder with a mass ratio of 75:15:10 in N-methyl-2-pyrrolidone solvent was used for fabricating the working
Control of morphology and crystallinity of CNTs in flame synthesis with one-dimensional reaction zone
Beilstein J. Nanotechnol. 2023, 14, 741–750, doi:10.3762/bjnano.14.61
- temperature field and the gas phase chemistry evolve concurrently inside the flame [24]; thus, particle formation and CNT growth occur almost instantaneously. The rapid particle formation from the surface breakup produces a heterogenous particle size distribution. Consequently, particle bundles can be
- temperatures at lower and higher HAB values. The lowest HAB value shows the highest temperature reading, which linearly decreases with increasing HAB values. The temperature differences are expected to produce different particle size distributions due to aggregation of particles on the surface of the nickel
- wire. The CNT diameters, which often correlate to the particle size, show a similar trend, as discussed in the next section. CNT characterization The diameter of the synthesized CNTs has been measured using the image post-processing software DigimizerTM with 200–300 data points per sample to produce
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
Titania nanoparticles for photocatalytic degradation of ethanol under simulated solar light
Beilstein J. Nanotechnol. 2023, 14, 616–630, doi:10.3762/bjnano.14.51
- correlation between specific surface area and particle/crystallite size is most obvious when comparing the TO-850-a sample with those synthesized at lower pressures. When the average particle size increases, the surface area diminishes. X-ray photoelectron spectroscopy (XPS) analysis was performed, and the
On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets
Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42
- prepare the mixed GNPref/graphite samples, 1.2 mg of the as-purchased graphite was mixed with 40 mL of NMP, and the mixture bath was sonicated for 30 min. Sonication was carried out to reduce the particle size while still maintaining the thickness to be graphite-like [29]. The graphite and GNPref
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
- magnetic field, shown in Figure 5b, are presented in Figure 5с. The particle size distribution for this assembly is given in Figure 5d. It is easy to see that in the given case only particles located in a small cylindrical region near the FFP with a radius of about 1 cm are capable of effectively absorbing
- the energy of the ac magnetic field. Furthermore, near the FFP the assembly SAR reaches 200 W/g. However, if the assembly of nanoparticles contains a large fraction of nanoparticles with the particle size distribution shown in Figure 5f, the spatial SAR distribution near the FFP changes. Figure 5e
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
- a color change with increasing particle size from brighter yellow-green to darker blue-green [14]. Usually, chromium oxide pigments are synthesized starting from dichromats with chromium in the oxidation state +6, which are toxic [15]. However, using boehmite as a host matrix, the opportunity arises
Plasmonic nanotechnology for photothermal applications – an evaluation
Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33
- where the incident electric field is assumed to be spatially uniform. This assumption is valid only for wavelengths much larger than the particle size. The extinction cross section, which is the result of this modelling and which is an expression summing up absorption and scattering of the incident
- coefficient (σext) is introduced as: where Cext is the extinction cross section. On substituting for the polarizability, the final expression for the extinction cross section [57] for a spherical particle interacting with light is arrived at as where a and εm are the particle size and dielectric constant of
- Electron–electron scattering is followed by electron–phonon coupling and heat transfer to the surrounding [71][72]. These non-radiative decay processes specifically concern PT applications. Electron–phonon coupling, which reduces with decreasing particle size, and electron–surface scattering, which rises
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
- fitting. Figure 4c indicates the size distribution of both samples. The average particle size of the Ch/Q-Ag NPs was calculated as 11.2 ± 2.4 nm, whereas it was found to be 10.3 ± 2.4 nm for the Ch/CA-Ag NPs. To visualize the organic shell structure that covers the Ag NPs, which is difficult to display in
- potentials, both regarding sign and numbers, clearly reveals that the stability of the NPs has changed significantly. Various studies have reported that in cell culture medium, there are pH-induced changes of NP conformation, particle size, stability, and functionality. Therefore, the nature of the cell
- and shape distribution with these co-capping agents. TEM images revealed that both Ch/Q- and Ch/CA-Ag NPs were spherical. When the size distributions were examined, the mean particle size of Ch/Q-Ag NPs was 11.2 ± 2.4 nm, and that of Ch/Q-Ag NPs was 10.3 ± 2.4 nm. Furthermore, TEM images of Ch/Q-Ag
The steep road to nonviral nanomedicines: Frequent challenges and culprits in designing nanoparticles for gene therapy
Beilstein J. Nanotechnol. 2023, 14, 351–361, doi:10.3762/bjnano.14.30
- not be as definitive as the solid-state particle distributions. Mobile solution phase particle size distributions (individual and ensemble analysis) In most instances, it will be valuable to assess the hydrodynamic size of the NPs. First, a quantification of the central tendency of the diameter or
- solution available at present. In the interim, with no “silver bullet” method available, there is likely great benefit in a quantification regime that may allow the key dosing values to be obtained through a combination of complementary methods (i.e., individual particle size distribution measurements
Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes
Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26
- nanodots), dimension, and particle size of the photocatalyst. Functional properties such as bandgap, optoelectronic properties, surface area, photoresponse, and magnetic properties depend on particle size and morphology of Bi-based photocatalysts. For instance, the charge diffusion path can be decreased by
- at a lower cost. The most frequently used wet-chemical techniques are hydrothermal and co-precipitation techniques. Morphology, particle size, and composition can be easily adjusted using hydrothermal methods, whereas agglomeration and particle size can be controlled using the co-precipitation method
Biocatalytic synthesis and ordered self-assembly of silica nanoparticles via a silica-binding peptide
Beilstein J. Nanotechnol. 2023, 14, 280–290, doi:10.3762/bjnano.14.25
- were observed regarding particle size or morphology depending on the SiBP concentration when SiBP was used alone as catalyst (Figure 2). At all concentrations, 17–20 nm particles were obtained with polydispersity indices (PDI) of 0.027, 0.050, and 0.010 for 0.04, 0.40, and 1 mM SiBP, respectively
- possible that SiBP binding to the particles results in the negligible effect on reaction rate and yield. All groups containing NH3 yielded spherical submicrometer particles characteristic to the Stöber method (Figure 3a–d). However, a decrease in average particle size and size distribution was observed
- observed around 457 nm (Figure 5e). The position and the width of the absorbance peaks in the UV–vis spectroscopy are determined by the Bragg diffraction of the light in photonic crystal structures and depend on the particle size, extent of the periodicity (i.e., quality of the assembly), and the angle of
Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating
Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11
- is denser than in the case of PEG600DA diacrylate monomer, which ultimately limits not only the increase in particle size but also the migration/diffusion of silver ions and NPs towards the surface. This affects the final thickness of the top metal layer, the depth of the concentration gradient and
Solvent-induced assembly of mono- and divalent silica nanoparticles
Beilstein J. Nanotechnol. 2023, 14, 52–60, doi:10.3762/bjnano.14.6
- patch made of grafted polystyrene chains. The multistage synthesis allows for a fine control of the patch-to-particle size ratio from 0.23 to 0.57. The assembly of the patchy nanoparticles can be triggered by reducing the solvent quality for the polystyrene chains. Dimers or trimers can be obtained by
- tuning the patch-to-particle size ratio. When mixed with two-patch nanoparticles, one-patch nanoparticles control the length of the resulting chains by behaving as colloidal chain stoppers. The present strategy allows for future elaboration of novel colloidal structures by controlled assembly of
- nanoparticles. Keywords: assembly; chain stopper; patchy nanoparticles; patch-to-particle size ratio; self-assembly; Introduction Colloidal engineering has become an enormous research endeavor, with a major focus placed on creating increasingly scalable smart particles, such that desired structures can be
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
- a temperature range of 25–900 °С (heating rate of 10 °C/min, N2 flux 80 mL/min). Before the TGA measurements, the nanoparticles were dried under vacuum at 50 °C. The average particle size was processed using the ImageJ software. The thickness of the organic shell of the stabilizer on the particle
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
- forms a porous structure. There is a disparity in the particle sizes measured with SEM and XRD, because the particle sizes detected using these two techniques are not in the same orientation, and the terms "particle size" and "crystal size" refer to different concepts (a particle may contain several or
- only one crystallite) [26]. The particle size can be calculated from the XRD measurements using the Scherrer equation (Equation 1). The sizes of the crystal structures are determined by analyzing the diffraction intensity of the X-ray beams. The lines in a powder diffraction pattern have a finite width
- , but the lines are wider than usual if the particles are small (widening decreases as the particle size increases). Line broadening is used to estimate the mean particle size, but peak broadening may have many causes other than crystal size. Widening of the diffraction peaks can result from both
In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124
- /AgCl-T100 at 562 nm. For AgNPs, the maximum absorption signal is typically in the range of 400–500 nm [31]. Absorption trends at longer wavelengths are associated with increasing particle size [35][36]. It is also evident from Figure 4 that the absorption peak for the reaction at 100 °C (Ag/AgCl-T100
- between the reducing biocompounds and the precursor salt. Concomitantly, the particle size increases, as shown by the trend of images a2–d2 in Figure 6. However, the particle size distribution also increases because the higher the reaction rate, the greater the formation of silver crystals of different
Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects
Beilstein J. Nanotechnol. 2022, 13, 1490–1504, doi:10.3762/bjnano.13.123
- dispersion medium, all of analytical purity; the sol–gel method was described elsewhere [36] (method I - HAG 1b). After the calcination at 900 °C for 2 h, the samples were ground to obtain the HAG powder of about 55 nm particle size. The bioglass composition is presented in Table 1. The samples were prepared
Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite
Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120
- 2a, the wrinkled area represents folded Gr sheets [52]. In Figure 2b, octahedron-like gold particles [53] are clearly visible in the corresponding FESEM image. The particle size of AuNPs seems to be larger than expected, which may be due to self-aggregation during the formation of the nanocomposite
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