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Search for "zeta potential" in Full Text gives 186 result(s) in Beilstein Journal of Nanotechnology.
Detection and imaging of Hg(II) in vivo using glutathione-functionalized gold nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 549–559, doi:10.3762/bjnano.13.46
- charges of GNPs, GNPs-GSH, and GNPs-GSH-Rh6G2 are shown in Figure 2d. Once GNPs were modified with GSH, the surface potential increased from −34.5 to −12.1 mV due to the positive surface charges of GSH. After further modifying with Rh6G2, the zeta potential increased to −8 mV. These results indicated that
- Fluorescence spectrophotometer (Hitachi, Japan). Mean particle size and the zeta potential were recorded using a Zetasizer Nano ZS90 (Malvern, UK). A Nicolet iS10 infrared spectrometer (Nicolet, USA) was used to gather FTIR spectra in a scanning range of 400–4000 cm−1. Fluorescence images of cells were
- bottle contain GNPs-GSH-Rh6G2 and GSH-Rh6G2, respectively); (c) UV–vis spectra of GNPs, GNPs-GSH, and GNPs-GSH-Rh6G2; (d) fluorescence excitation and emission spectra of GNPs-GSH-Rh6G2. DLS of (a) GNPs, (b) GNPs-GSH, and (c) GNPs-GSH-Rh6G2 (insets: TEM images); (d) zeta potential of GNPs, GNPs-GSH, and
Stimuli-responsive polypeptide nanogels for trypsin inhibition
Beilstein J. Nanotechnol. 2022, 13, 538–548, doi:10.3762/bjnano.13.45
- confirmed by dynamic light scattering and zeta potential measurements. The loading capacity of PHEG-Tyr and Nα-Lys-NG nanogels and their release profiles were first optimized with bovine serum albumin. The nanogels were then used for loading and release of AAT. PHEG-Tyr and Nα-Lys-NG nanogels showed
- represented by DH and zeta potential. Figure 2a depicts the change in DH of PHEG-Tyr nanogel as a response to pH variation from 4 to 4.7 at 25 °C, showing a continuous increase of DH from 179 to 205 nm as a result of the protonation of amine groups of PHEG-Tyr nanogel and the expansion of PHEG-Tyr nanogel
- indicates that PHEG-Tyr nanogel is more solubilized at 25 °C than at 37 °C when the polymer–polymer interactions prevail [28]. The zeta potential of PHEG-Tyr nanogel was measured to determine the surface properties at different pH values and temperatures. Figure 2b shows that the zeta potential of PHEG-Tyr
Ethosomal (−)-epigallocatechin-3-gallate as a novel approach to enhance antioxidant, anti-collagenase and anti-elastase effects
Beilstein J. Nanotechnol. 2022, 13, 491–502, doi:10.3762/bjnano.13.41
- size (PS), zeta potential (ZP), polydispersity index (PDI), encapsulation efficiency percentage (EE%), and in vitro release. The best ETH formulation was used to prepare the ethosome-based gel (ETHG) by using Carbopol 980 as a gelling agent at a ratio of 1:1 (v/v). The gel formulation was evaluated
- [30][31]. The negative zeta potential in all of our formulations is thought to be due to the presence of ethanol. Conversely, there is a decrease in the encapsulation efficiency due to the increasing lipid ratio. All formulations showed approximately 50% of in vitro release, but the highest rate was
Micro- and nanotechnology in biomedical engineering for cartilage tissue regeneration in osteoarthritis
Beilstein J. Nanotechnol. 2022, 13, 363–389, doi:10.3762/bjnano.13.31
- monoiodoacetate-induced osteoarthritis in rats. The SM-loaded NPs showed suitable properties in terms of particle size (81.4 nm), zeta potential (−28.3 mV), and high encapsulation efficiency (97.5%). Histological criteria, knee bend score, and oxidative stress remarkably improved in rats treated with the SM
Coordination-assembled myricetin nanoarchitectonics for sustainably scavenging free radicals
Beilstein J. Nanotechnol. 2022, 13, 284–291, doi:10.3762/bjnano.13.23
- shows spherical MZG nanoparticles. Size and zeta potential value of the MZG nanoparticles were 44.6 ± 26.5 nm and −23.1 ± 3.4 mV, respectively, measured by dynamic light scattering (DLS) (Figure 2b) and consistent with the TEM results. Importantly, the co-assembly mechanism was further revealed through
Engineered titania nanomaterials in advanced clinical applications
Beilstein J. Nanotechnol. 2022, 13, 201–218, doi:10.3762/bjnano.13.15
- found that nps smaller than 100 nm produce more ROS due to their higher surface area [29]. Properties of nps such as surface charge density and zeta potential are influential in determining their reactivity, agglomeration properties, interaction with cells, stability in complex media, and adsorption of
Bacterial safety study of the production process of hemoglobin-based oxygen carriers
Beilstein J. Nanotechnol. 2022, 13, 114–126, doi:10.3762/bjnano.13.8
- . Additionally, HbMP were prepared with a spiked hemoglobin solution as well as under standard process conditions as a control. Hemoglobin microparticles – size, zeta potential, morphology In addition to particle preparation with spiked hemoglobin, particles were also prepared using the standard protocol. The
- the CCD method after precipitation, as well as after cross-linking, dissolution, and final washing steps are shown in Figure 1. The zeta potential of HbMP in phosphate-buffered saline (PBS), pH 7.4, was −8.51 ± 0.9 mV. The zeta potential in PBS, pH 7.0, of E. coli was −16 mV, that of S. epidermidis
- , −8 mV [40]. Thus, both the HbMP and the bacteria showed a negative zeta potential and strong aggregation due to different charges seems unlikely. In the CCD process there are some centrifugation steps in the preparation of the HbMP. After centrifugation, both the particles and the majority of the
Theranostic potential of self-luminescent branched polyethyleneimine-coated superparamagnetic iron oxide nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 82–95, doi:10.3762/bjnano.13.6
- solution, added into the gel wells, and separated under an electric field (80 mV, 400 mA) for 60 min using a Bio-Rad Mini-Sub Cell GT Cell. DLS and zeta potential measurements The hydrodynamic radius and ζ-potential of the nanoparticles were determined using a Zetasizer Ultra (Malvern Instruments Ltd, UK
- the hydrodynamic radius by preventing agglomeration and increasing stabilization of the nanoparticles. The zeta potential values of SPION@bPEI and SPION@bPEI-Erb were measured to be +35.2 mV and +29.1 mV, respectively (Supporting Information File 1, Table S1), which is expected since the conjugation
- particles used for pGFP transfection. Supporting Information Supporting Information File 72: Supporting Information contains dynamic light scattering (DLS), photoluminescence spectra, and zeta potential analysis of SPION@bPEI, SPION@bPEI/pDNA, SPION@bPEI-Erb, SPION @bPEI-Erb/pDNA, and SPION@bPEI-Erb/pDNA
Biocompatibility and cytotoxicity in vitro of surface-functionalized drug-loaded spinel ferrite nanoparticles
Beilstein J. Nanotechnol. 2021, 12, 1339–1364, doi:10.3762/bjnano.12.99
- specificity with significantly higher (p < 0.005) drug release in an acidic environment (pH 5.5). The nanoparticles were highly colloidal (zeta potential = −35 to −26 mV) in deionized water, phosphate buffer saline (PBS), and sodium borate buffer (SBB). They showed elevated and dose-dependent cytotoxicity in
- ) dispersed in deionized water, sodium borate buffer (SBB) pH 9.0, phosphate buffer saline (PBS) pH 7.4, and DMEM were used for zeta potential measurements. The purpose of using buffers (i.e., SBB, PBS) was to get indirect surface charge information. Deionized water was used to check the influence of
- electrolytes on the stability of NPs [29], and DMEM was used as a representative of biological assays. All NPs (MFe2O4-PMA, MFe2O4+DOX, and MFe2O4+MTX) indicated high zeta potential values (−35 to −26 mV) in all dispersion media except DMEM (−17 to −10 mV) as shown in Table 4. The reason behind lower zeta
A review on slip boundary conditions at the nanoscale: recent development and applications
Beilstein J. Nanotechnol. 2021, 12, 1237–1251, doi:10.3762/bjnano.12.91
- hand, it should be noted that the increase in surface charge density can also directly increase the bare surface potential, thus increasing the zeta potential, denoted by ζ, which is a key parameter that reflects the amplitude of the electrokinetic effects. Therefore, the increase in surface charge
pH-driven enhancement of anti-tubercular drug loading on iron oxide nanoparticles for drug delivery in macrophages
Beilstein J. Nanotechnol. 2021, 12, 1127–1139, doi:10.3762/bjnano.12.84
- vibration at 1734.5 (Supporting Information File 1, Figure S1). Such peak shifts are also observed when NOR interacts with metal ions like NiO [41]. The zeta potential of these particles was found to be +29 mV, validating the loading of drug and indicating nanoparticle stability at neutral pH
- zeta potential of these particles was indeed found to be −16.5 mV, supporting this. Comparing the different nanoparticles synthesized, i.e., UIONPs, NOR@IONPpH5 and NOR@IONPpH10, we observed that the drug coated IONPs have a much lower aggregate size with a reduced hydrodynamic size distribution (Table
- drug loading is 3 times greater than determined for NOR@IONPs synthesized in our previous study, where the drug coating was estimated to be 17.13 µg/mg of the nanoparticle [30]. At pH 5, we know from the zeta potential that, IONPs express a positive charge (Figure 2d). Therefore, an electrostatic
Modification of a SERS-active Ag surface to promote adsorption of charged analytes: effect of Cu2+ ions
Beilstein J. Nanotechnol. 2021, 12, 902–912, doi:10.3762/bjnano.12.67
- polyhexamethylene guanidine (PHMG) were used as basic polymer modifiers to create positive charges on the Ag surface (Figure 7, numbers 1 and 2). Both of them were described as effective Ag NP stabilizers, which lead to NPs with positive zeta potential [7][19]. We found that treatment of the Ag NPs with those
Comprehensive review on ultrasound-responsive theranostic nanomaterials: mechanisms, structures and medical applications
Beilstein J. Nanotechnol. 2021, 12, 808–862, doi:10.3762/bjnano.12.64
Silver nanoparticles induce the cardiomyogenic differentiation of bone marrow derived mesenchymal stem cells via telomere length extension
Beilstein J. Nanotechnol. 2021, 12, 786–797, doi:10.3762/bjnano.12.62
- laboratory unit, which is approved by the Iranian Nanotechnology Initiative Council (Figure 9A). Also, the size distribution and zeta potential distribution was provided by the commercial supplier as (Figure 9B,C). BM-MSCs isolation BM-MSCs were isolated for a previous study by Fathi and co-workers [41
- real-time PCR (D and E); (*P < 0.05, **P < 0.01, and ***P < 0.001), respectively. Ag-NPs structure. (A) SEM image of Ag-NPs, (B) size distribution by intensity, and (C) zeta potential distribution. Ag-NPs characterization. Primer sequences used for the aTL measurement. Primer sequences used for the
Fate and transformation of silver nanoparticles in different biological conditions
Beilstein J. Nanotechnol. 2021, 12, 665–679, doi:10.3762/bjnano.12.53
- a final AgNP concentration of 10 mg Ag/L and incubated at room temperature on a digital waving rotator (Thermo Scientific, USA), protected from light. The changes in size distribution and zeta potential were monitored by DLS and ELS, respectively, with the recordings taken at 0, 1, 4, and 24 h after
- biological media. Information on the composition and pH of biologically relevant artificial media used for the evaluation of the stability and transformation of AgNPs. Values of primary size (obtained by TEM), hydrodynamic diameter (dH), zeta potential (ζ), and percentages of released ionic silver in
- colloidal suspension of AgNPs coated with PLL, AOT, or PVP. Supporting Information This file shows three tables with values of hydrodynamic diameter, % volume distribution, zeta potential, and % of dissolved AgNPs immersed in different media. Supporting Information File 62: Experimental parameters of AgNPs
The preparation temperature influences the physicochemical nature and activity of nanoceria
Beilstein J. Nanotechnol. 2021, 12, 525–540, doi:10.3762/bjnano.12.43
- hydrodynamic diameter (Smoluchowski's approximation) of the as-prepared- (as-loaded) and the partially dissolved nanoceria was determined by dynamic light scattering (DLS) using a Brookhaven 90Plus Particle Size Analyzer. The zeta potential (0.5 mg/mL) from pH 0.5 to 13, adjusted with nitric acid and sodium
- contrast, solvothermally synthesized nanoceria was coated with, on average, a monolayer of citrate, intentionally applied to inhibit agglomeration [35]. It is assumed that the citrate coating was dissolved as surface cerium ions were solubilized. The reduction in absolute zeta potential of the partially
A review on nanostructured silver as a basic ingredient in medicine: physicochemical parameters and characterization
Beilstein J. Nanotechnol. 2021, 12, 440–461, doi:10.3762/bjnano.12.36
- , such as pH, dissolved oxygen, and zeta potential (ZP) [51][52][53]. The storage temperature is a critical factor that controls the percentage of oxidative dissolution of AgNPs. The higher the temperature, the greater the speed of the dissolution reaction [54][55]. Kittler et al. studied the dissolution
- expensive instrument cost include the requirement of high voltage, high vacuum and a tricky sample preparation protocol, which is extremely important to obtain high-quality images [33][156]. Zeta potential: The zeta potential, also called the electrokinetic potential, is the potential in the sliding plane
Colloidal particle aggregation: mechanism of assembly studied via constructal theory modeling
Beilstein J. Nanotechnol. 2021, 12, 413–423, doi:10.3762/bjnano.12.33
- parameterized by the zeta potential, ζp. This repulsive double layer force is given by [14]: where d is the particle separation distance, a is the particle radius, T is the temperature of the system, e is the elementary charge, kB is Boltzmann’s constant, and ε0 and εc are vacuum permittivity and fluid
Doxorubicin-loaded gold nanorods: a multifunctional chemo-photothermal nanoplatform for cancer management
Beilstein J. Nanotechnol. 2021, 12, 295–303, doi:10.3762/bjnano.12.24
- compared to non-irradiated samples (p < 0.05). The zeta potential values of GNRs, PSS-GNRs and DOX-PSS-GNRs were measured as 42 ± 0.1 mV, −40 ± 0.3 mV and 39.3 ± 0.6 mV, respectively. PSS-GNRs nanocomplexes were found to be biocompatible and showed higher photothermal stability. The DOX-conjugated
- refractive index around GNRs due to adsorption of DOX might lead to a stronger Columbic restoring force and a redshift of the LSPR peak [29]. The zeta potential of unrefined GNRs was measured to be 60 ± 0.2 mV, which decreased to 42 ± 0.1 mV after removal of excess CTAB (two rounds of centrifugation and re
- -dispersion). A negative zeta potential of −30 ± 0.3 mV was measured after successful coating of the GNR surfaces with PSS. The positive zeta potential (40.3 ± 0.6 mV) of DOX-PSS-GNRs, due to the positive charge of DOX, confirmed the chemistry changes to the GNR surfaces (Figure 1d). Our results revealed a
Characterization, bio-uptake and toxicity of polymer-coated silver nanoparticles and their interaction with human peripheral blood mononuclear cells
Beilstein J. Nanotechnol. 2021, 12, 282–294, doi:10.3762/bjnano.12.23
- 0.18, indicating an acceptably monodisperse particle suspension and an absence of larger agglomerates in ultrahigh-purity water (UHPW) (Table 1). A representative curve is shown in Supporting Information File 1, Figure S1a. The zeta potential was measured as −23.3 ± 2.1 mV for PVP-coated AgNPs (PVP
- ][57] and protect them from dissolution and aggregation in complex media [42][43]. Z-average hydrodynamic diameter and PDI of pristine PVP-AgNPs were measured using DLS with a Malvern Zetasizer NanoZS (Malvern Instruments, MA, USA). The colloidal stability (zeta potential) of PVP-AgNPs was measured by
Differences in surface chemistry of iron oxide nanoparticles result in different routes of internalization
Beilstein J. Nanotechnol. 2021, 12, 270–281, doi:10.3762/bjnano.12.22
- , determines the toxicity of NPs, and affects geometry and size of NPs, which play a crucial role in cellular uptake [38][39]. Despite nearly identical magnetite core size, hydrodynamic size, and zeta potential of the MNPs in the stock solution, the hydrodynamic size of PEG-SO-MNPs in culture medium was almost
- characteristics of these nanoparticles in the solvent and culture medium are shown in Table 1. Dynamic light scattering (DLS) Particle size distribution and zeta potential of the surface-modified MNPs in stock solution and culture medium were determined by DLS using a Zetasizer Nano-ZS (Malvern Instruments, UK
The nanomorphology of cell surfaces of adhered osteoblasts
Beilstein J. Nanotechnol. 2021, 12, 242–256, doi:10.3762/bjnano.12.20
- adhesion interface areas are desired. Regarding this, a variety of surface coatings was assessed. Relevant parameters may be the zeta potential and pre-adsorbed cell adhesion proteins from the serum of the medium [4][10]. Before osteoblasts start the adhesion and spreading programs, they settle on the
- et al. [44], MG-63 osteoblast-like cells are to 62%, 18.6%, and 19.4% in the G1, S, and G2 phases, respectively. On average (analyzing 44 cells and taking three samplings on each cell) the excess surface on glass (0.25 ± 0.03) is larger than on PPAAm (0.17 ± 0.04). A slightly positive zeta potential
- predominantly observed on primary rat osteoblasts cultured on bioglass, which is less negative in zeta potential compared to quartz glass. Membrane holes and smaller protrusions Though the ruffles are the most prominent feature we observe on the osteoblastic cells, further membrane features, such as holes and
A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures
Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9
Effect of different silica coatings on the toxicity of upconversion nanoparticles on RAW 264.7 macrophage cells
Beilstein J. Nanotechnol. 2021, 12, 35–48, doi:10.3762/bjnano.12.3
- measurements. The DLS and ZP results are also shown in Table 1. The zeta potential changed from negative to positive after AHAPS functionalization due to the positive surface charge of the amine group in the AHAPS ligand. The zeta potential values of the AHAPS-functionalized samples slightly decreased after
- transfer from ethanol to water, as reported in several publications [51][52], and, consequently, their hydrodynamic diameter values increased. The zeta potential of the non-functionalized particles is more negative in water than in ethanol, and, in this case, the Z-average value also increases. The Z
- (pore size: 0.2 µm, Rotilab). Nylon filters were used for particles dispersed in cyclohexane and ethanol, whereas regenerated cellulose filters were used for particles dispersed in water or DMEM. Zeta potential measurements of the dispersions in ethanol and water were carried out using capillary zeta
PEG/PEI-functionalized single-walled carbon nanotubes as delivery carriers for doxorubicin: synthesis, characterization, and in vitro evaluation
Beilstein J. Nanotechnol. 2020, 11, 1728–1741, doi:10.3762/bjnano.11.155
- transmission electron microscopy (TEM, JEM-200CX). To determine particle size and zeta potential, a sample of 200 μL (with a concentration of 50 μg·mL−1) was dispersed in deionized water to a final volume of 3 mL. Particle size and zeta potential were measured using laser particle analysis (Malvern Zetasizer
- 3000HS). A volume-weighted Gaussian size distribution was fit to the autocorrelation functions to obtain the particle size and zeta potential values. The atomic fractions of C, O, and N in the different SWCNTs samples were determined by X-ray photoelectron spectroscopy (XPS, Thermo Fisher Scientific
- . Although the numerical result obtained by size analysis does not represent the accurate length of the SWCNTs it is a good reference value for comparison. The zeta potential of raw SWCNTs is nearly neutral, while those of all CNTs-COOH samples are significantly decreased and all below −25 mV, indicating
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