Control of nanostructures through pH-dependent self-assembly of nanoplatelets

Chang，Jing1; Shao，Huaizhi2; Liu，Bo1; Manica，Rogerio1; Li，Zhen3; Liu，Qingxia1; Xu，Zhenghe1,4

2021-01-15

10.1016/j.jcis.2020.07.093

JOURNAL OF COLLOID AND INTERFACE SCIENCE   影响因子和分区

0021-9797

1095-7103

Hypothesis: The self-assembly of platy clay particles is influenced by anisotropic surface charging properties of the particles. The Stern potentials of particle surfaces are controlled by solution pH. Consequently, the energy-favorable particle association varies with pH, leading to different self-assembly structures. Therefore, it should be possible to form desired nanostructure of final clay product through self-assembly of clay particles by controlling the surface charge through adjusting solution pH. Experiments: Three different surfaces of kaolinite clay nanoparticles were selectively exposed for Stern potential determination using an atomic force microscope. Aggregation structures through particle self-assembly were predicted based on the analysis of interaction energies between various types of surfaces of kaolinite particles. The structures were visually confirmed using the freeze-dried scanning electron microscopy technique. Findings: By reducing pH of a concentrated kaolinite suspension from 8 to 5 and 3, the dispersed kaolinite particles were self-assembled to a well-stacked configuration and card-house structure, respectively. Current study demonstrates that the pH-dependent surface properties of platy kaolinite nanoparticles can be successfully used to understand the macroscopic behavior (rheology) of kaolinite nanoparticle suspensions and design nanostructures of clay products (catalysts and sorbents). The pH-dependent self-assembly is also applicable to other platy particles of anisotropic surface (charging or wettability) properties.

Atomic force microscope Kaolinite Nanostructure materials pH-dependent Stern potential Surface charge-controlled particle self-assembly

SCI ; EI

英语

其他

Leading Talents Program of Guangdong Province[K17253301]

Chemistry

Chemistry, Physical

WOS:000590679100012

ACADEMIC PRESS INC ELSEVIER SCIENCE

20203509120159

Surface charge ; Suspensions (fluids) ; Scanning electron microscopy ; Anisotropy ; Product design ; Nanoparticles ; Self assembly

Minerals:482.2 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Production Engineering:913.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933 ; Materials Science:951

CHEMISTRY

2-s2.0-85089936650

Scopus

1.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,T6G 1R1,Canada
2.Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education),School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,221116,China
3.College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Xi'an,710054,China
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Chang，Jing,Shao，Huaizhi,Liu，Bo,et al. Control of nanostructures through pH-dependent self-assembly of nanoplatelets[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2021,582:439-445.

Chang，Jing.,Shao，Huaizhi.,Liu，Bo.,Manica，Rogerio.,Li，Zhen.,...&Xu，Zhenghe.(2021).Control of nanostructures through pH-dependent self-assembly of nanoplatelets.JOURNAL OF COLLOID AND INTERFACE SCIENCE,582,439-445.

Chang，Jing,et al."Control of nanostructures through pH-dependent self-assembly of nanoplatelets".JOURNAL OF COLLOID AND INTERFACE SCIENCE 582(2021):439-445.