Preparation of Al(OH)3-based layered structural material by shear alignment from aqueous dispersion of colloidal gibbsite platelets

Nguyen, Minh Kim; Trung, Le Gia; Nguyen, Hoang Hung; Tran, Nguyen Tien

doi:10.1016/j.jtice.2021.06.006

Cited by 5 publications

(14 citation statements)

References 51 publications

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“…15,16 In recent years, nanomaterials with low-dimensional structures have been widely used as a new type of promoted material due to their superior physicochemical properties for many potential applications, such as uorescent probes, inorganic membranes of gibbsite platelets, anisotropic lms, etc. [17][18][19] A metal-organic framework (MOF) is a porous material with one-(1D), two-(2D), or three-dimensional (3D) structures made up of metal ions or clusters coordinated to organic ligands. That has been extensively studied as an interesting material in research and technology.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies

Trung

Nguyen

et al. 2023

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies

Trung

Nguyen

et al. 2023

RSC Adv.

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“…20,23 The centrifugation process was used to reduce the polydispersity of particles. 23 The average lateral diameter of GS particles was measured at approximately 164 ± 39 nm by evaluating over 200 individual hexagonal platelets from TEM images (Figure 1a). The lateral size of as-synthesized GS nanoparticles was larger than previous reports.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…To address these issues, 2D colloidal GS nanoplatelets are a superior candidate due to their versatile nanostructures and excellent dispersibility in hydrophilic compounds. Moreover, regarding the self-stacking and selfassembly of 2D platelets, 23 GS-layer-coated foams may extremely effectively prevent thermal transmission over foams. Outstandingly, GS/polymer composites may preserve both the anisotropic properties of GS and the flexible behaviors of polymers.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Gibbsite Nanoparticle/Polyacrylamide Composites for Flame-Retardant Materials

Trung,

Nguyen,

Mishra

et al. 2023

ACS Appl. Nano Mater.

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nanomaterials have many potential applications. Herein, 2D colloidal gibbsite (GS) nanoparticles, [γ-Al(OH) 3 ], dispersed easily in water, are used as an effective filler for polyacrylamide (PAM) to improve their thermal degradation behaviors for applied fields in flame retardants. A composite containing 10.0 wt % GS retains more than 30.8 wt % noninflammable residues after pyrolysis (900 °C). The kinetics and thermodynamics of PAM and GS/PAM have been elaborately investigated using thermogravimetric analysis for the first time. The kinetic (activation energy, pre-exponential factor, reaction order) and thermodynamic (ΔH, ΔG, ΔS) parameters during the major decomposition zone (330−460 °C) are determined by applying Van Krevelen, Horowitz−Metzger, Coats−Redfern, Broido, Madhusudanan, Arrhenius, and Bagchi models. The results show that as the content of GS or acrylamide in composites increases, their activation energy increases or decreases, respectively. For a composite containing 10.0 wt % GS and 30.0 wt % acrylamide, compared to PAM, the activation energy reaches the highest value of 362.720 kJ/mol, the ignition time is 125 s longer, and the peak heat release rate and total heat release diminish by 44.5 and 68.8%, respectively. The presence of a kinetic compensation effect is also evident. The as-prepared GS/acrylamide is an aqueous dispersion and is hence easily surface-coated onto other flammable foams or materials by blade-coating or dipping. Our studies contribute to understanding 2D GS-blended nanocomposites in their applications as flame retardants or fire-resistant membranes.

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“…The further theoretical prediction for the I–N m transition in the dispersion of rod-shaped and disc-shaped molecules has been reported by Bates and Frenkel based on a calculation of the total free energy (i.e., excluded volume effect of molecules). Lyotropic LCs of colloids have great potential for effectively producing oriented materials in a macroscopic framework from nanoscale building blocks. − These basic blocks can self-assemble into the colossal colloidal aggregates with several forms from one-dimensional tubes to two-dimensional (2D) layers, e.g., montmorillonite, gibbsite, and Mxene …”

Section: Introductionmentioning

confidence: 99%

“…Lyotropic LCs of colloids have great potential for effectively producing oriented materials in a macroscopic framework from nanoscale building blocks. 3−5 These basic blocks can self-assemble into the colossal colloidal aggregates with several forms from onedimensional tubes to two-dimensional (2D) layers, e.g., montmorillonite, 6 gibbsite, 7 and Mxene. 8 Graphene is a 2D-structural allotrope of carbon and can be seen as a single layer of graphite.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide Liquid Crystals Aligned in a Confined Configuration: Implications for Optical Materials

Trung

Mishra

Subedi

et al. 2022

ACS Appl. Nano Mater.

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Orientation control of two-dimensional (2D) colloidal liquid crystals in both microscopic and macroscopic scales holds massive promise for improved multifield applications. In this respect, graphene oxide (GO) is used as a platform substance for 2D carbon-based lyotropic liquid crystal (LC) materials. Here, we design the directed alignment of aqueous GO-LC dispersion confined in a rectangular capillary tube. The isotropic GO dispersion is loaded into a horizontal capillary and subsequently concentrated to the LC phase by slow water evaporation at open ends of the tube. An obtained surprising result, GO layers organize normal to the inner surfaces of the capillary with a highly ordered orientation of the optic axis over tens of millimeters. Such transverse orientation of GO layers originates from the meniscus region and then moves toward the center, caused by the interfacial effect and the sequential isotropic-to-nematic transition. This aligned mesomorphic system is characterized via optical retardation, nematic order parameter, absorption, and modified Cauchy’s transmission equation about the dependency of both birefringence and wavelength with concentration. Finally, the aligned GO-LC layers are preserved in a polymer composite matrix by photopolymerizing the evaporation-aligned GO/acrylamide-LC dispersion confined in a capillary. This composite shows higher thermal stability than polyacrylamide until 500 °C of about 6.1%. Our experimental findings provide efficient advantages for controlling the orientation of GO-LC and 2D materials, beneficial for diverse optical applications due to their directional ordering.

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Preparation of Al(OH)3-based layered structural material by shear alignment from aqueous dispersion of colloidal gibbsite platelets

Cited by 5 publications

References 51 publications

Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies

Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies

Colloidal Gibbsite Nanoparticle/Polyacrylamide Composites for Flame-Retardant Materials

Graphene Oxide Liquid Crystals Aligned in a Confined Configuration: Implications for Optical Materials

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