Dynamic Light Scattering Studies in Silica/Ethylene Glycol Charged Colloidal System

Tata, B. V. R.; Mohanty, Priti S.; Yamanaka, Junpei; Kawakami, Tadashige

doi:10.1080/0892702031000152136

Cited by 7 publications

(16 citation statements)

References 10 publications

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“…5) should be independent of q. 26 We have prepared a dilute sample S1 and verified that the sample is non-interacting (gas-like) by performing DLS and SLS measurements. At T = 25 °C the average hydrodynamic diameter and size polydispersity are determined to be 273 nm and 0.01, respectively.…”

Section: Effect Of Temperature On Particle Size and Volume Phase Tranmentioning

confidence: 92%

Phase Behavior of Poly(N-isopropylacrylamide) Nanogel Dispersions: Temperature Dependent Particle Size and Interactions

Brijitta¹,

Tata²,

Kaliyappan³

2009

j nanosci nanotechnol

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The phase behavior of poly(N-isopropylacrylamide) nanoparticles dispersed in aqueous medium is investigated as a function of temperature using static and dynamic light scattering techniques. The diameter, d of the particles, as determined by dynamic light scattering measurements on dilute dispersion showed a decrease in size from 273 nm at 25 degrees C to 114 nm at 40 degrees C as function of temperature with a sudden collapse of particle volume (volume phase transition) at 32.4 degrees C. Further this nanoparticle dispersion is found to turn turbid beyond volume phase transition. Static light scattering measurements on samples with intermediate concentration and high concentration showed liquid-like order and crystalline order respectively. The intensity of the Bragg peak of the crystallized sample when monitored as a function of temperature showed crystal to liquid transition at 26.2 degrees C and a fluid to fluid transition at 31 degrees C. The occurrence of melting at a volume fraction of 0.85 and the absence of change in number density across the fluid-to-fluid transition suggest that interparticle interaction is repulsive soft-sphere below the volume phase transition. The reported results on the phase behavior of poly(N-isopropylacrylamide) nanogel suspensions are discussed in the light of the present results.

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Section: Effect Of Temperature On Particle Size and Volume Phase Tranmentioning

confidence: 92%

Phase Behavior of Poly(N-isopropylacrylamide) Nanogel Dispersions: Temperature Dependent Particle Size and Interactions

Brijitta¹,

Tata²,

Kaliyappan³

2009

j nanosci nanotechnol

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“…The CCs reported in the present work are not close to melting transition. However, we have estimated W [9] from DLS measurements for our samples and it is found to be W 0:13. This number is larger than that in atomic crystals at melting and hence our crystals are expected to have strong anharmonicity.…”

mentioning

confidence: 98%

“…In CCs, multiple scattering can be suppressed by matching closely the refractive index of the particle p with that of the host fluid m . We achieve this in a charged colloidal system consisting of silica particles having a radius of 60 5 nm by redispersing [9] the aqueous silica suspension in pure ethylene glycol. Mother suspension with 90:10 EGW mixtures was left for complete deionization after adding a known amount of mixed-bed of anion and cation exchange resin beads (AG 501 X8 (D), Biorad, USA).…”

mentioning

confidence: 99%

“…The absence of significant scattered intensity from our CCs in the depolarized geometry also confirms the absence of multiple scattering. This allowed us to carry out light scattering studies over a wide range of volume fractions ( 0:0006-0:12) [9]. We report here the DLS measurements carried out at room temperature on two samples S1 and S2 having volume fractions 0.048 and 0.064, respectively.…”

mentioning

confidence: 99%

“…The normalized electric field autocorrelation g 1 k; t, obtained from the measured scattered-light correlation function g 2 k; t using Siegert relation [2,3,9], is related to the time autocorrelation function q t of the normal modes …”

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confidence: 99%

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Long-Wavelength Transverse Modes in Charged Colloidal Crystals

et al. 2004

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The dynamics of closely index matched colloidal crystals of charged silica spheres dispersed in deionized ethylene glycol-water mixture is investigated using dynamic light scattering. At variance with the reports of phonon dispersion measurements on thin colloidal crystals, our observations on millimeter-sized crystals show unambiguous evidence for overdamped transverse modes turning propagative in the range of small wave numbers in agreement with the theory of hydrodynamic interactions in charged colloidal crystals.

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Accurate Determination of the Size and Mass of Polymers, Nanoparticles, and Fine Bubbles in Water

Takahashi

2019

Springer Series in Light Scattering

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Dynamic Light Scattering Studies in Silica/Ethylene Glycol Charged Colloidal System

Cited by 7 publications

References 10 publications

Phase Behavior of Poly(N-isopropylacrylamide) Nanogel Dispersions: Temperature Dependent Particle Size and Interactions

Phase Behavior of Poly(N-isopropylacrylamide) Nanogel Dispersions: Temperature Dependent Particle Size and Interactions

Long-Wavelength Transverse Modes in Charged Colloidal Crystals

Accurate Determination of the Size and Mass of Polymers, Nanoparticles, and Fine Bubbles in Water

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