Measurement of Absolute Coagulation Rate Constants for Colloidal Particles: Comparison of Single and Multiparticle Light Scattering Techniques

Holthoff, Helmut; Schmitt, A.; Fernández-Barbero, A.; Borkovec, Michal; Cabrerizo-Vílchez, Miguel A.; Schurtenberger, Peter; Hidalgo‐Álvarez, R.

doi:10.1006/jcis.1997.5022

Cited by 102 publications

(97 citation statements)

References 29 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Low zeta potential ensures recession or total double-layer collapse to actualize Table 5. The discrepancies occurring in kinetic parameters could be attributed to interplay between van der Waals and hydrodynamic forces, which reduces by factor of 2 the correlation between experimental and theoretical values [19,24,40,41].…”

Section: Xrd Pattern Of Tfs Tfc and Ssatmentioning

confidence: 99%

Post-treatment sludge analyses and purification of paint effluent by coag-flocculation method

Menkiti

Ezemagu

Nwoye

et al. 2015

Int J Energy Environ Eng

View full text Add to dashboard Cite

Tympanotonos fuscatus shell (T. fuscatus shell), an abundant eco-friendly waste was used as a precursor for the production of Tympanotonos fuscatus coagulant (TFC) for the purification of paint effluent (PE). Tympanotonos fuscatus shells (TFS) are of crustacean origin consisting mainly of chitin, calcium carbonate, entrained protein and other organic matrixes. Influence of pH, dosage and settling time on treatment efficiency was studied. Scanning electron microscopic, Fourier transform infra red, X-ray diffraction and differential scanning calorimetric/thermogravimetric analyses were carried out to investigate, respectively, the surface morphology, functional group, crystalline/lattice structure and thermal stability of TFS, TFC and settled sludge after treatment. The PE was optimally treated at 2 g/L TFC dosage, pH 5 and 97 % efficiency. Results indicated that TFC could be an efficient treatment agent for PE at the conditions of the experiment. Concentration of turbidity at time t = 0 N t Concentration of turbidity at time

show abstract

Section: Xrd Pattern Of Tfs Tfc and Ssatmentioning

confidence: 99%

Post-treatment sludge analyses and purification of paint effluent by coag-flocculation method

Menkiti

Ezemagu

Nwoye

et al. 2015

Int J Energy Environ Eng

View full text Add to dashboard Cite

show abstract

“…To get around directly calculating or measuring the optical factor I 2 (q)/2I 1 (q), Holthoff et al 16,17 suggested that one can combined Eq. (6) for SLS and Eq.…”

Section: Simultaneous Static and Dynamic Light Scatteringmentioning

confidence: 99%

“…[14][15][16][17][18] Specifically, turbidity measurement, static light scattering (SLS) and dynamic light scattering (DLS) are the most widely adopted methods. The major difficulty in determining coagulation rate by light scattering is how to theoretically calculate the so-called optical factor I 2 (q)/2I 1 (q), where I 1 (q) and I 2 (q) (q is the scattering vector, see below for the definition) are the scattered intensity of a singlet and a doublet, respectively.…”

Section: Introductionmentioning

confidence: 99%

A study on independently using static and dynamic light scattering methods to determine the coagulation rate

Zhou

et al. 2014

The Journal of Chemical Physics

View full text Add to dashboard Cite

A first-passage scheme for determination of overall rate constants for non-diffusion-limited suspensions J. Chem. Phys. 116, 3128 (2002); 10.1063/1.1436119 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation. Absolute coagulation rate constants were determined by independently, instead of simultaneously, using static and dynamic light scattering with the requested optical factors calculated by T-matrix method. The aggregating suspensions of latex particles with diameters of 500, 700, and 900 nm, that are all beyond validity limit of the traditional Rayleigh-Debye-Gans approximation, were adopted. The results from independent static and dynamic light scattering measurements were compared with those by simultaneously using static and dynamic light scattering; and three of them show good consistency. We found, theoretically and experimentally, that for independent static light scattering measurements there are blind scattering angles at that the scattering measurements become impossible and the number of blind angles increases rapidly with particle size. For independent dynamic light scattering measurements, however, there is no such a blind angle at all. A possible explanation of the observed phenomena is also presented. © 2014 AIP Publishing LLC.

show abstract

“…Diffusion coefficients are determined by fitting an experimentally determined autocorrelation function with a 3D Gaussian model [24,25,27] and the hydrodynamic diameters of the labelled particles are calculated from the diffusion coefficients using the Stokes-Einstein equation. [25,[27][28][29] Enhanced dark-field microscopy with HSI is a non-invasive technique that measures the light scattered by particles, including nanoparticles. [26,30,31] The measured spectral signature of the scattered light (determined on a pixel by pixel basis) can be used to determine the nature, size and shape of the particles, and spectral signatures can be used to map nanoparticles in a given sample.…”

Section: Introductionmentioning

confidence: 99%

Heteroagglomeration of nanosilver with colloidal SiO2 and clay

et al. 2017

View full text Add to dashboard Cite

Environmental context. The fate of nanomaterials in the environment is related to their colloidal stability. Although numerous studies have examined their homoagglomeration, their low concentration and the presence of high concentrations of natural particles implies that heteroagglomeration rather than homoagglomeration is likely to occur under natural conditions. In this paper, two state-of-the art analytical techniques were used to identify the conditions under which nanosilver was most likely to form heteroagglomerates in natural waters.Abstract. The environmental risk of nanomaterials will depend on their persistence, mobility, toxicity and bioaccumulation. Each of these parameters is related to their fate (especially dissolution, agglomeration). The goal of this paper was to understand the heteroagglomeration of silver nanoparticles in natural waters. Two small silver nanoparticles (nAg, ,3 nm; polyacrylic acid-and citrate-stabilised) were covalently labelled with a fluorescent dye and then mixed with colloidal silicon oxides (SiO 2 , ,18.5 nm) or clays (,550 nm SWy-2 montmorillonite). Homo-and heteroagglomeration of the nAg were first studied in controlled synthetic waters that were representative of natural fresh waters (50 mg Ag L À1 ; pH 7.0; ionic strength 10 À7 to 10 À1 M Ca) by following the sizes of the nAg by fluorescence correlation spectroscopy. The polyacrylic acid-coated nanosilver was extremely stable under all conditions, including in the presence of other colloids and at high ionic strengths. However, the citrate-coated nanosilver formed heteroaggregates in presence of both colloidal SiO 2 and clay particles. Nanoparticle surface properties appeared to play a key role in controlling the physicochemical stability of the nAg. For example, the polyacrylic acid stabilized nAg-remained extremely stable in the water column, even under conditions for which surrounding colloidal particles were agglomerating. Finally, enhanced dark-field microscopy was then used to further characterise the heteroagglomeration of a citrate-coated nAg with suspensions of colloidal clay, colloidal SiO 2 or natural (river) water.

show abstract

Measurement of Absolute Coagulation Rate Constants for Colloidal Particles: Comparison of Single and Multiparticle Light Scattering Techniques

Cited by 102 publications

References 29 publications

Post-treatment sludge analyses and purification of paint effluent by coag-flocculation method

Post-treatment sludge analyses and purification of paint effluent by coag-flocculation method

A study on independently using static and dynamic light scattering methods to determine the coagulation rate

Heteroagglomeration of nanosilver with colloidal SiO2 and clay

Contact Info

Product

Resources

About