Sodium Chloride and Ethanol Induced Sphere to Rod Transition of Triblock Copolymer Micelles

Ganguly, R.; Aswal, Vinod K.; Hassan, P. A.; Gopalakrishnan, I. K.; Yakhmi, J. V.

doi:10.1021/jp0468408

Cited by 135 publications

(161 citation statements)

References 44 publications

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“…The disappearance of the correlation peak, shows change in shape of the micelles from sphere to ellipsoidal. Ganguly et al [46] have shown similar effects for prolate ellipsoidal transition in P123 micelles on addition of ethanol. Fig.…”

Section: Small Angle Neutron Scattering (Sans)mentioning

confidence: 72%

Influence of a hydrophobic diol on the micellar transitions of Pluronic P85 in aqueous solution

Bharatiya¹,

Aswal²,

Hassan³

et al. 2008

Journal of Colloid and Interface Science

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Section: Small Angle Neutron Scattering (Sans)mentioning

confidence: 72%

Influence of a hydrophobic diol on the micellar transitions of Pluronic P85 in aqueous solution

Bharatiya¹,

Aswal²,

Hassan³

et al. 2008

Journal of Colloid and Interface Science

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“…The disappearance of correlation peak confirms the sphere-to-ellipsoidal transition. Ganguly et al [13] have shown similar effects for prolate ellipsoidal transition in P123 micelles on addition of ethanol. Figure 2 shows the SANS profiles for 5% P123, P85, F127 and F88 in the presence of 0.6 wt% diol.…”

Section: Resultsmentioning

confidence: 72%

Small angle neutron scattering study on the aggregation behaviour of PEO-PPO-PEO copolymers in the presence of a hydrophobic diol

2008

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Small angle neutron scattering (SANS) measurements on aqueous solutions of four polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymers (commercially known as Pluronic R )F88, P85, F127 and P123 in the presence of hydrophobic C14Diol (also known as Surfynol R 104) reveal information on micellization, micellar size and micellar transitions. While most hydrophilic F88 (with least PPO/PEO ratio) remained unimers in water at 30 • C, other copolymers formed micellar solutions. Surfynol R 104 is sparingly soluble in water to only about ∼0.1 wt%, but on addition to pluronic solution, it gets incorporated in the micellar region of block copolymer which leads to increase in aggregation number and transformation of spherical to ellipsoidal micelles. The added diol-induced micellization in F88, though hydrophilic copolymers F88 and F127 did not show any appreciable micellar growth or shape changes as observed for P85 and P123 (which are comparatively more hydrophobic). The SANS results on copolymer pairs with same molecular weight PPO but different % PEO (viz. F88 and P85, F127 and P123) and with same molecular weight PEO but different PPO (F88 and F127) reveal that the copolymer with large PPO/PEO ratio facilitate micellar transition in the presence of diol. An increase in temperature and presence of added electrolyte (sodium chloride) in the solution further enhances these effects. The micellar parameters for these systems were found out using available software and are reported.

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“…Three small-angle neutron scattering facilities are operated at Dhruva. One instrument based on pin-hole collimation geometry has been extensively used [14][15][16][17][18][19][20][21][22][23] for research in the area of soft condensed matter, such as polymers, colloids, surfactants, biopolymers, gels, liquid crystals, foams and emulsions. A polarized neutron small-angle facility is also available recently on the spin-echo spectrometer [24].…”

Section: Structural Studies At Mesoscopic Length Scalementioning

confidence: 99%

Recent neutron scattering research and development in India

Chaplot

2006

Pramana - J Phys

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A national facility for neutron beam research is operated at the research reactor Dhruva at Trombay in India. The research activities involve various nanoscale structural, dynamical and magnetic investigations on materials of scientific interest and technological importance. Thermal neutron has certain special properties that enable, e.g., selective viewing of parts of an organic molecule, hydrogen or water in materials, investigations on minerals and ceramics, and microscopic and mesoscopic characterization of bulk samples. The national facility comprises of eight neutron-scattering spectrometers in the reactor hall, and another four spectrometers in the neutron-guide laboratory. In addition, a neutron radiography facility and a detector development laboratory are located at APSARA reactor. All the instruments including the detectors and electronics have been developed within BARC. A new powder diffractometer (PD-3) is being developed by UGC-DAE-CSR. The national facility is utilized in collaboration with various universities and other institutions.

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Sodium Chloride and Ethanol Induced Sphere to Rod Transition of Triblock Copolymer Micelles

Cited by 135 publications

References 44 publications

Influence of a hydrophobic diol on the micellar transitions of Pluronic P85 in aqueous solution

Influence of a hydrophobic diol on the micellar transitions of Pluronic P85 in aqueous solution

Small angle neutron scattering study on the aggregation behaviour of PEO-PPO-PEO copolymers in the presence of a hydrophobic diol

Recent neutron scattering research and development in India

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