Biopolymer-Targeted Adsorption onto Halloysite Nanotubes in Aqueous Media.

6533b7d3fe1ef96bd1260083

RESEARCH PRODUCT

Biopolymer-Targeted Adsorption onto Halloysite Nanotubes in Aqueous Media.

Vanessa Bertolino Giuseppe Cavallaro Stefana Milioto Giuseppe Lazzara Filippo Parisi

subject

Materials science Biopolymer Functionalized nanotube 02 engineering and technology engineering.material Hydroxypropyl cellulose 010402 general chemistry 01 natural sciences Halloysite chemistry.chemical_compound symbols.namesake Adsorption Enthalpy Kaolinite Langmuir adsorption model Polymer chemistry Electrochemistry Halloysite nanotube (HNTs)General Materials Science Surface charge Free energy Polymer Spectroscopy Yarn Functionalized nanoparticle Hydroxypropyl cellulose Langmuir adsorption model Water Isothermal titration calorimetry Surfaces and Interfaces Polymer adsorption Thermal Propertie 021001 nanoscience & nanotechnology Condensed Matter Physics Pectin 0104 chemical sciences Biomolecule Nanotube chemistry Chemical engineering engineering symbols Isothermal titration calorimetry Biopolymer Adsorption 0210 nano-technology Surface charge propertie Thermodynamic parameter Polymers Chitosan

description

Studies on the adsorption of biopolymers onto halloysite nanotubes (HNTs) in water were conducted. Three polymers with different charges-anionic (pectin), neutral (hydroxypropyl cellulose), and cationic (chitosan)-were chosen. The thermodynamic parameters for the adsorption of polymers onto the HNT surface were determined by isothermal titration calorimetry (ITC). The experimental data were interpreted based on a Langmuir adsorption model. The standard variations in free energy, enthalpy, and entropy of the process were obtained and discussed. Turbidimetry was used to evaluate the stability of functionalized nanoparticles in water. The ζ-potential clarified the surface charge properties of functionalized nanotubes upon polymer adsorption. The interaction of modified nanotubes with polymers led to the formation of a colloidal system with tunable stability and surface properties, which offers different perspectives on new applications of these dispersions, such as carriers for substances to be released in response to external stimuli. © 2017 American Chemical Society.

year	journal	country	edition	language
2017-03-21	Langmuir : the ACS journal of surfaces and colloids

10.1021/acs.langmuir.7b00600 https://pubmed.ncbi.nlm.nih.gov/28276693