Rheological behaviour of a lamellar liquid crystalline surfactant–water system

Németh, Zsolt; Halász, László; Pálinkás, János; Bóta, A.; Horányi, T.S.

doi:10.1016/s0927-7757(98)00576-7

Cited by 78 publications

(38 citation statements)

References 23 publications

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“…7. The micrograph looks similar to other micrographs from the other systems, which form multilamellar vesicles [36][37][38][39][40][41][42][43][44][45]. As it appears from Fig.…”

Section: The Effect Of Glycerol On Ff-tem Micrographssupporting

confidence: 79%

A novel viscoelastic system from a cationic surfactant and a hydrophobic counterion

Abdel‐Rahem¹,

Gradzielski

Hoffmann³

2005

Journal of Colloid and Interface Science

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“…7. The micrograph looks similar to other micrographs from the other systems, which form multilamellar vesicles [36][37][38][39][40][41][42][43][44][45]. As it appears from Fig.…”

Section: The Effect Of Glycerol On Ff-tem Micrographssupporting

confidence: 79%

A novel viscoelastic system from a cationic surfactant and a hydrophobic counterion

Abdel‐Rahem¹,

Gradzielski

Hoffmann³

2005

Journal of Colloid and Interface Science

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“…The rheogram has shown in Fig. 3a (50 wt.% glycerol) is consistent with a typical lamellar structure [24][25][26][27]. Later we will come to this point.…”

Section: Rheological Behavior Of the H 1 Phase And O/h 1 Gel Emulsionsupporting

confidence: 73%

Glycerol effects on the formation and rheology of hexagonal phase and related gel emulsion

Alam

Aramaki

2009

Journal of Colloid and Interface Science

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We have investigated the effects of glycerol on the formation and rheology of hexagonal phase (H(1)) and related O/H(1) gel emulsion in the water/C(12)EO(8)/dodecane system at 25 degrees C. It has been found that the aqueous solution of C(12)EO(8) forms H(1) phase, which could solubilize some amounts of dodecane. Beyond the solubilization limit, oil is separated and a two-phase region or H(1)+O phase appeared. Due to high viscosity of the H(1) phase, allows forming O/H(1) gel emulsion at the H(1)+O region. Rheological measurements (without glycerol) have shown that the rheogram of the H(1) phase does not change drastically with the addition of oil but the system is shifted to longer relaxation time. Simultaneously, the values of the absolute value(eta(*)) are found to increase with the addition of oil, which has been described with the neighboring micellar interaction. The rheogram of the O/H(1) gel emulsion shows gel type nature (G'>G'') but the viscosity monotonically decreases with increasing oil content, which could be due to the lower volume fraction of the continuous phase (H(1) phase). Addition of glycerol has brought an order-order transition or the microstructural transition from H(1)-lamellar (L(alpha)) phase, which is manifested from rheology and SAXS measurements. Viscosity of the O/H(1) gel emulsion also decreases with increasing glycerol content. Digital images show the physical appearance of the gel emulsion changes from turbid to transparent, which is depended on the glycerol concentration (since glycerol matches the refractive index of the H(1) phase and dodecane). Structural parameters of the H(1) phase have been evaluated with the help of Bohlin's model and found that the coordination number of the H(1) phase depends not only the oil and glycerol concentrations but also temperature.

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“…5A-5D, all for the same system but with different magnifications, the vesicles have diameters ranging from 100 to about 2000 nm. The micrograph looks similar to other micrographs from other systems, which form multilamellar vesicles [20][21][22][23][24][25][26][27][28][29]. For the system C 16 TAOH/2,1-HNC [5], multilamellar vesicles have diameters ranging from 100-1200 nm, and interlamellar spacing about 60 nm.…”

Section: The System 21-hnc/c 12 Taohsupporting

confidence: 77%

Novel viscoelastic systems from cationic surfactants and hydrophobic counter-ions: Influence of surfactant chain length

Abdel‐Rahem¹,

Hoffmann

2007

Journal of Colloid and Interface Science

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Rheological behaviour of a lamellar liquid crystalline surfactant–water system

Cited by 78 publications

References 23 publications

A novel viscoelastic system from a cationic surfactant and a hydrophobic counterion

A novel viscoelastic system from a cationic surfactant and a hydrophobic counterion

Glycerol effects on the formation and rheology of hexagonal phase and related gel emulsion

Novel viscoelastic systems from cationic surfactants and hydrophobic counter-ions: Influence of surfactant chain length

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