Determination of Number Density of Particles Together with Measurement of Their Sizes by Dynamic Light Scattering

Levin, A. D.; Nagaev, A. I.; Sadagov, A. Yu.

doi:10.1007/s11018-018-1498-y

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…Dynamic light scattering can be used to determine the particle size of proteins, 44 polymers, 45,46 micelles, 47,48 and nanoparticles 49,50 in solution or suspension. It could be observed from Figure 5A that with the increase of the amount of grafted PAA, the particle size of the GO-PAA composite showed an upward trend.…”

Section: Characterization Of Membranesmentioning

confidence: 99%

Graft‐crosslinked graphene oxide nanofiltration membrane with pH‐responsive nanochannels

Wang,

Yan,

et al. 2024

Polymers for Advanced Techs

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Electrostatic effect and Donnan effect could effectively improve the separation performance of nanofiltration membrane. Polyions were grafted from graphene oxide (GO) nanosheets to prepare the nanofiltration membrane, and the electrostatic effect and Donnan effect in the membrane pores could be greatly improved. The GO was modified by introducing double bonds. Then, polyanionic poly(acrylic acid) (PAA) and polycationic diallyldimethylammonium chloride (PDDA) were grafted from GO nanosheets, which were employed to fabricate the nanofiltration membranes, respectively. Therefore, nanofiltration membranes GO‐PAA and GO‐PDDA with cross‐linked structure and pH responsiveness were prepared. The separation effect of the anionic dyes was over 99%, and the membrane had perfect adsorption effect on cationic dyes. The cross‐linked structure formed between GO nanosheets inhibited the change of the interlayer spacing of the nanofiltration membrane. The conformation of the graft chains could be adjusted by the pH value of the solution, by adjusting the size of the nanochannel. The rejection rates of the nanofiltration membranes for the cationic dyes could reach more than 98%, and the membrane had perfect adsorption effect on anionic dyes. Similar to the grafted polyanion, the grafted polycation also formed a cross‐linked structure between the graphene nanosheets, thereby inhibiting the change of the nanochannels with the pH value to a certain extent. Polyionic nanofiltration membranes have excellent selectivity and could be widely used in the treatment of dye wastewater and other fields.

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Section: Characterization Of Membranesmentioning

confidence: 99%

Graft‐crosslinked graphene oxide nanofiltration membrane with pH‐responsive nanochannels

Wang,

Yan,

et al. 2024

Polymers for Advanced Techs

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“…However, this calibration curve does not reveal the total gold concentration nor the number of AuNPs in the solution. If the total gold concentration is known in the solution, a mathematical model can be developed to determine the number of nanoparticles in the solution, similar to the SP-ICP-MS algorithm method [15][16][17][35][36][37][38][39][40]. An external calibration curve based on gold salt standards was used to determine the total concentration of gold in standards prepared from varying the volume of AuNPs.…”

Section: Analysis Of Gold Salts and Nanoparticlesmentioning

confidence: 99%

“…Their model allowed the quick estimation of the molar concentration and the sizes from the optical spectra. In another study, Levin et al [17] proposed a method to measure the size of nanoparticles using the dynamic light scattering (DLS) analyzer to determine the number density in suspension. They concluded that the method proposed can be used to measure various nanoparticles, including non-spherical-shaped particles.…”

Section: Introductionmentioning

confidence: 99%

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A Simple Model to Estimate the Number of Metal Engineered Nanoparticles in Samples Using Inductively Coupled Plasma Optical Emission Spectrometry

2022

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Accurate determination of the size and the number of nanoparticles plays an important role in many different environmental studies of nanomaterials, such as fate, toxicity, and occurrence in general. This work presents an accurate model that estimates the number of nanoparticles from the mass and molar concentration of gold nanoparticles (AuNPs) in water. Citrate-capped AuNPs were synthesized and characterized using transmission electron microscopy (TEM) and ultraviolet–visible spectroscopy (UV-vis). A mimic of environmental matrices was achieved by spiking sediments with AuNPs, extracted with leachate, and separated from the bulk matrix using centrifuge and phase transfer separation techniques. The quantification of AuNPs’ molar concentration on the extracted residues was achieved by inductively coupled plasma optical emission spectroscopy (ICP-OES). The molar concentrations, an average diameter of 27 nm, and the colloidal suspension volumes of AuNPs enable the calculation of the number of nanoparticles in separated residues. The plot of the number of AuNPs against the mass of AuNPs yielded a simple linear model that was used to estimate the number of nanoparticles in the sample using ICP-OES. According to the authors’ knowledge, this is the first adaptation of the gravimetric method to ICP-OES for estimating the number of nanoparticles after separation with phase transfer.

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“…According to the Stokes-Einstein equation, the hydrodynamic particle diameter X_h (particle core + adsorbate/ligand shell) was calculated. The weighted hydrodynamic particle size distribution was converted to a number % via Mie correction through the size-dependent extinction coefficient [18].…”

Section: Dynamic Light Scattering Measurementsmentioning

confidence: 99%

Preparation and characterization of silica hydrogel nanocomposites as a drug delivery system

Abdelazeem

El-Sayed

Abo-Naf

et al. 2020

Journal of Scientific Research in Science

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Determination of Number Density of Particles Together with Measurement of Their Sizes by Dynamic Light Scattering

Cited by 5 publications

References 2 publications

Graft‐crosslinked graphene oxide nanofiltration membrane with pH‐responsive nanochannels

Graft‐crosslinked graphene oxide nanofiltration membrane with pH‐responsive nanochannels

A Simple Model to Estimate the Number of Metal Engineered Nanoparticles in Samples Using Inductively Coupled Plasma Optical Emission Spectrometry

Preparation and characterization of silica hydrogel nanocomposites as a drug delivery system

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