Reversible flocculation of silica across the phase boundary of poly(vinyl caprolactam) in aqueous solution

Q. Qiu; Brian Anthony Pethica; P. Somasundaran

doi:10.1021/la0517235

Reversible flocculation of silica across the phase boundary of poly(vinyl caprolactam) in aqueous solution

Q. Qiu, Brian Anthony Pethica, P. Somasundaran

Chemical & Biological Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The colloid stability of silica dispersions in water in the presence of poly(vinyl caprolactam) (PVCAP) has been studied below and above the lower consolute temperature (LCT) of its solutions. The dispersion sediments slowly without PVCAP in the temperature range studied (26-40°C) or with PVCAP below the LCT (∼30°C). In contrast, with PVCAP above the LCT, rapid flocculation occurs at acid pH, with redispersal on cooling. Reversible flocculation is also obtained above the LCT by cycling the pH from alkaline to acid and back. The flocculation observed above the LCT may also be regarded as heterocoagulation between the silica particles and the aggregates of the polymer.

Original language	English (US)
Pages (from-to)	12096-12099
Number of pages	4
Journal	Langmuir
Volume	21
Issue number	26
DOIs	https://doi.org/10.1021/la0517235
State	Published - Dec 20 2005

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la0517235

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title = "Reversible flocculation of silica across the phase boundary of poly(vinyl caprolactam) in aqueous solution",

abstract = "The colloid stability of silica dispersions in water in the presence of poly(vinyl caprolactam) (PVCAP) has been studied below and above the lower consolute temperature (LCT) of its solutions. The dispersion sediments slowly without PVCAP in the temperature range studied (26-40°C) or with PVCAP below the LCT (∼30°C). In contrast, with PVCAP above the LCT, rapid flocculation occurs at acid pH, with redispersal on cooling. Reversible flocculation is also obtained above the LCT by cycling the pH from alkaline to acid and back. The flocculation observed above the LCT may also be regarded as heterocoagulation between the silica particles and the aggregates of the polymer.",

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AU - Qiu, Q.

AU - Pethica, Brian Anthony

AU - Somasundaran, P.

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N2 - The colloid stability of silica dispersions in water in the presence of poly(vinyl caprolactam) (PVCAP) has been studied below and above the lower consolute temperature (LCT) of its solutions. The dispersion sediments slowly without PVCAP in the temperature range studied (26-40°C) or with PVCAP below the LCT (∼30°C). In contrast, with PVCAP above the LCT, rapid flocculation occurs at acid pH, with redispersal on cooling. Reversible flocculation is also obtained above the LCT by cycling the pH from alkaline to acid and back. The flocculation observed above the LCT may also be regarded as heterocoagulation between the silica particles and the aggregates of the polymer.

AB - The colloid stability of silica dispersions in water in the presence of poly(vinyl caprolactam) (PVCAP) has been studied below and above the lower consolute temperature (LCT) of its solutions. The dispersion sediments slowly without PVCAP in the temperature range studied (26-40°C) or with PVCAP below the LCT (∼30°C). In contrast, with PVCAP above the LCT, rapid flocculation occurs at acid pH, with redispersal on cooling. Reversible flocculation is also obtained above the LCT by cycling the pH from alkaline to acid and back. The flocculation observed above the LCT may also be regarded as heterocoagulation between the silica particles and the aggregates of the polymer.

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Reversible flocculation of silica across the phase boundary of poly(vinyl caprolactam) in aqueous solution

Abstract

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