Particle size distribution recovery from non-Gaussian intensity autocorrelation functions obtained from dynamic light scattering at ultra-low particle concentrations

Wang, Qin; Shen, Jin; Thomas, John C.; Wang, Mengjie; Liu, Wei; Wang, Yajing

doi:10.1016/j.powtec.2022.118033

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…The particle size and zeta potential were fitted by Gaussian normal distribution, and the results showed that R 2 was greater than 0.9, indicating the reliability of the data. 23 The above results show that the SBSI latex has a stronger repulsive force and hydrophilicity, thereby preventing the agglomeration between the dispersed particles, which also confirms the dispersion state of the two latexes in Figure 5a,b.…”

Section: Mechanical Property Measurementsupporting

confidence: 77%

Effects of carboxylated styrene‐butadiene latex nanoparticles on channeling leakage and pore structure of oil well cement

Dong,

Wang,

et al. 2024

J of Applied Polymer Sci

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The exploitation efficiency of oil and gas resources depends on the cementing quality. In cementing engineering, interlayer migration occurs in the underground gas layer with cement hole as the main channel, which seriously threatens the sealing integrity of cement casing and leads to the failure of cementing operation. To improve the gas migration control ability of oil well cement (OWC), two carboxylated styrene‐butadiene latex nanomaterials styrene butadiene latex containing itaconic acid and sodium p‐styrene sulfonate (SBSI) and styrene‐butadiene latex containing methacrylic acid and sodium p‐styrene sulfonate (SBSM) were synthesized. The effects of SBSI and SBSM with different carboxyl structures on the gas migration control ability and pore structure of cement were investigated. The results show that the latex is densely packed on the cement matrix through the dissociation and adsorption behavior of carboxyl groups, and the smaller particle size and lower adsorption are more conducive to the formation of the film. The introduction of latex effectively shortened the transition time of cement gel state and significantly reduced the permeability of interlayer material migration. Compared with OWC, the transition time of cement containing SBSI and SBSM latex (SBSI/OWC and SBSM/OWC) decreased from 28 to 18 and 17 min, respectively, and the filter loss decreased from 60 to 40 and 36 mL, respectively. The isolation effect of the latex film on the interlayer gas and the provision of mechanical support have greatly improved the gas migration control ability of the cement and ensured the cementing quality. In addition, the refinement of cement pore structure caused by latex brings better rheological and mechanical properties to cement. This study clarified the change of latex in the gel transition stage of OWC from liquid to solid and revealed the mechanism of latex on the internal structure change of cement. It broadens the application range of latex nanomaterials in the field of OWC and provides a new possibility for the use of OWC in high temperature and high salt environment.

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Section: Mechanical Property Measurementsupporting

confidence: 77%

Effects of carboxylated styrene‐butadiene latex nanoparticles on channeling leakage and pore structure of oil well cement

Dong,

Wang,

et al. 2024

J of Applied Polymer Sci

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“…A lower relaxation time ( τ ) under illumination indicates more efficient exciton dissociation at the heterojunction interface and a faster charge transport process, leading to an excellent responsiveness of the heterojunction. 31 Fig. 7b shows a slightly asymmetric curve, which may be due to the superposition of several peaks corresponding to the distributions of associated relaxation times.…”

Section: Resultsmentioning

confidence: 96%

Light-enhanced electrical behavior of a Au/Al-doped ZnO/p-Si/Al heterostructure: insights from impedance and current–voltage analysis

Benamara,

Nassar,

Soltani

et al. 2023

RSC Adv.

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“…The analysis of the experimental DLS data consists in finding the set of values Ii -τi that allows reconstructing the experimental ACF with the best statistical quality. The particle sizes are obtained from the values of τ using equation (5).…”

Section: Data Availability Statementmentioning

confidence: 99%

“…The main difficulty in solving such inverse tasks is that different solutions may give comparable fits to experimental data. A number of algorithms were developed in this area [4,5] (and references in this articles) and equipment manufacturers provide their own closed software. Nevertheless, the scientist is often left alone with the DLS instrument without a chance to compare different statistically similar solutions.…”

Section: Introductionmentioning

confidence: 99%

Study of Nanoparticles by Dynamic Light Scattering: Processing Challenges

Annenkov

2023

Preprint

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Nanoparticles are of great importance for various scientific and technological applications, drug discovery, ecology, molecular biology, etc. Size is a basic characteristic of any particle, and dynamic light scattering is beyond competition when measuring particle size in dispersions ranging from nanometers to micrometers. Unfortunately, this method has a serious problem in processing and interpreting experimental data. Instrument noise and polydispersity of the sample lead to the situation when one initial autocorrelation function corresponds to several different particle size distributions. Sometimes these different solutions of the inverse task can be found by changing parameters in the software. Sometimes the scientist cannot be suspicious of possible other solutions, having one result from the program. In this article I demonstrate the problem on model and experimental data using three known programs: CONTIN, the Malvern Zetasizer and DynaLS. I also present my own free program Autocor, which allows to test our own hypotheses about the modality and shape of the particle size distribution by optimizing the parameters of our own models with a small number of degrees of freedom.

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Particle size distribution recovery from non-Gaussian intensity autocorrelation functions obtained from dynamic light scattering at ultra-low particle concentrations

Cited by 5 publications

References 22 publications

Effects of carboxylated styrene‐butadiene latex nanoparticles on channeling leakage and pore structure of oil well cement

Effects of carboxylated styrene‐butadiene latex nanoparticles on channeling leakage and pore structure of oil well cement

Light-enhanced electrical behavior of a Au/Al-doped ZnO/p-Si/Al heterostructure: insights from impedance and current–voltage analysis

Study of Nanoparticles by Dynamic Light Scattering: Processing Challenges

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