THE ADSORPTION OF LINEAR POLY(N-ISOPROPYLACRYLAMIDE)CHAINS ON SURFACTANT-FREE POLYSTYRENE NANOPARTICLES

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THE ADSORPTION OF LINEAR POLY(N-ISOPROPYLACRYLAMIDE)CHAINS ON SURFACTANT-FREE POLYSTYRENE NANOPARTICLES

Papers | Updated：2021-06-21

- THE ADSORPTION OF LINEAR POLY(N-ISOPROPYLACRYLAMIDE)CHAINS ON SURFACTANT-FREE POLYSTYRENE NANOPARTICLES
- Vol. 17, Issue 6, Pages: 595-601(1999)
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- Published：20 December 1999
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THE ADSORPTION OF LINEAR POLY(N-ISOPROPYLACRYLAMIDE)CHAINS ON SURFACTANT-FREE POLYSTYRENE NANOPARTICLES[J]. 1999, 17(6): 595-601.
DOI：

THE ADSORPTION OF LINEAR POLY(N-ISOPROPYLACRYLAMIDE)CHAINS ON SURFACTANT-FREE POLYSTYRENE NANOPARTICLES[J]. 1999, 17(6): 595-601. DOI：

摘要

The adsorption of linear poly(N-isopropylacrylamide) (PNIPAM) chains on surfactant-freepolystyrene (PS) nanoparticles was used as a model system to study the hydrophobic adsorption of polymeron the surface

because the hydrophobility of PNIPAM can be continuously varied by a small temperaturechange. The adsorption was investigated by a combination of static and dynamic laser light scattering (LLS)measurements

In static LLS

the absolute excess scattered light intensity led to the amount of PNIPAMa dsorbed on the surface.In dynamic LLS

the hydrodynamic thickness of the adsorbed PNIPAM layer was accurately measured.For a given particle concentration

the adsorption increases as the PNIPAM concentration and the incubation temperature increase.The average density of the adsorbed PNIPAM layer is reciprocally proportional to the number of the PNIPAM chains on the surface

revealing a simple scaling of the chain density distribution.The adsorption follows the Langmuir's isotherm.The enthalpy change estimated from the adsorption at 25℃ and 30℃ is slightly positive

indicating that the adsorption involves the coil-to-globule transition of the chains on the surface.

Abstract

In static LLS

the absolute excess scattered light intensity led to the amount of PNIPAMa dsorbed on the surface.In dynamic LLS

the hydrodynamic thickness of the adsorbed PNIPAM layer was accurately measured.For a given particle concentration

revealing a simple scaling of the chain density distribution.The adsorption follows the Langmuir's isotherm.The enthalpy change estimated from the adsorption at 25℃ and 30℃ is slightly positive

indicating that the adsorption involves the coil-to-globule transition of the chains on the surface.

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