TY - JOUR
T1 - Polyphosphates can stabilize but also aggregate colloids
AU - Motta, Rayssa Jossanea Brasileiro
AU - Almeida, Ana Zélia Falcão
AU - de Lima, Bruna Luiza Batista
AU - Schneider, Ricardo
AU - Balaban, Rosangela de Carvalho
AU - van Duijneveldt, Jeroen Sebastiaan
AU - de Oliveira, Rodrigo José
PY - 2019/11/29
Y1 - 2019/11/29
N2 - Phosphates are well known as dispersants for a variety of colloidal particles. Here however we use rheological measurements to show that high molecular weight polyphosphates (PP) can instead act as a flocculant for Laponite clay platelets. The proposed mechanism is bridging of PP between clay particle edges, leading to highly charged clusters forming a Wigner glass. Dynamic light scattering shows a bimodal cluster size distribution, independent of PP molecular weight, but the highest molecular weight gave the highest viscous and loss moduli for the PP-clay solid. These unique all-inorganic solids may have application in solid-state ionic conducting materials, controlled release fertilizers and biomedical applications.
AB - Phosphates are well known as dispersants for a variety of colloidal particles. Here however we use rheological measurements to show that high molecular weight polyphosphates (PP) can instead act as a flocculant for Laponite clay platelets. The proposed mechanism is bridging of PP between clay particle edges, leading to highly charged clusters forming a Wigner glass. Dynamic light scattering shows a bimodal cluster size distribution, independent of PP molecular weight, but the highest molecular weight gave the highest viscous and loss moduli for the PP-clay solid. These unique all-inorganic solids may have application in solid-state ionic conducting materials, controlled release fertilizers and biomedical applications.
U2 - 10.1039/C9CP05225A
DO - 10.1039/C9CP05225A
M3 - Article (Academic Journal)
VL - 2020
SP - 15
EP - 19
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 1
M1 - 15
ER -