On the Size Effect of Gelation Kinetics in RF Aerogels

Ratke, Lorenz; Hajduk, Anna

doi:10.3390/gels1020276

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…The aggregated and combined nature of the primary particle is mainly due to the smaller volume of the droplets formed during the emulsion process. According to Ratke et al [ 38 ], the aggregation and compaction of the particles were in correlation with the drop volume of the RF aerogel droplet gelled in paraffin oil.…”

Section: Resultsmentioning

confidence: 99%

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

2021

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Organic aerogels in the form of powder, microgranules and microsized particles receive considerable attention due to their easy fabrication, low process time and costs compared to their monolithic form. Here, we developed resorcinol-formaldehyde (RF) aerogel microparticles by using an emulsion-gelation method. The main objective of this study is to investigate the influence of curing time, stirring rate, RF sol:oil ratio and initial pH of the sol in order to control the size and properties of the microparticles produced. The emulsion-gelation of RF sol prepared with sodium carbonate catalyst in an oil phase at 60 °C was explored. RF microparticles were washed with ethanol to remove the oil phase followed by supercritical and ambient pressure drying. The properties of the dried RF microparticles were analyzed using FT-IR, N2 adsorption isotherm, gas pycnometry, wide angle X-ray scattering and scanning electron microscope. RF microparticles with high surface area up to 543 m2/g and large pore volume of 1.75 cm3/g with particle sizes ranging from 50–425 µm were obtained.

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Section: Resultsmentioning

confidence: 99%

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

2021

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“…In addition, they created a model known as the fluctuating bond aggregation (FBA) to clarify their results. In addition, Ratke and Hajduk investigated the size effect of RF gels on gelation time by preparing them in different volumes ( Ratke and Hajduk, 2015 ).…”

Section: Solution Preparation and Gelationmentioning

confidence: 99%

The effect of synthesis conditions and process parameters on aerogel properties

Payanda Konuk,

Alsuhile,

Yousefzadeh

et al. 2023

Front. Chem.

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Aerogels are remarkable nanoporous materials with unique properties such as low density, high porosity, high specific surface area, and interconnected pore networks. In addition, their ability to be synthesized from various precursors such as inorganics, organics, or hybrid, and the tunability of their properties make them very attractive for many applications such as adsorption, thermal insulation, catalysts, tissue engineering, and drug delivery. The physical and chemical properties and pore structure of aerogels are crucial in determining their application areas. Moreover, it is possible to tailor the aerogel properties to meet the specific requirements of each application. This review presents a comprehensive review of synthesis conditions and process parameters in tailoring aerogel properties. The effective parameters from the dissolution of the precursor step to the supercritical drying step, including the carbonization process for carbon aerogels, are investigated from the studies reported in the literature.

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“…Although this mesoscale atomistic model is able to capture the structural and mechanical properties, the atomistic nature does not allow for modeling of the sol-gel process, which involves condensation reactions. Currently, the following approaches for sol-gel representation are gaining more attention [1,6]: (i) algorithm based on the Smoluchowski equation [7,8], (ii) Langevin dynamics [9,10], (iii) percolation theory and cluster aggregation models [11][12][13]. Among these, percolation theory and cluster aggregation have provided significant insights into the internal gel structure [6,8], correlating synthesis parameters with microstructure [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the microstructural connectivity and compressive behavior of particle aggregated silica aerogels

Xiong,

Abdusalamov,

Itskov

et al. 2024

Proc Appl Math and Mech

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Porous media such as aerogels can exhibit unique properties including low thermal conductivity, low bulk density, and low sound velocity. However, the limited mechanical properties of aerogels restrict their widespread application. This study focuses on understanding the mechanical behavior of aggregated silica aerogels by investigating their microstructural connectivity and densification mechanisms under uniaxial compression. The interparticle connectivity is generated using the diffusion‐limited cluster–cluster aggregation (DLCA) algorithm, and the particle connections are modeled by beam elements that account for contact interaction. The mechanical response of representative volume elements (RVEs) is analyzed in both linear and nonlinear regimes while applying periodic boundary conditions. The model is correlated with experimental compression test data to validate the simulation results. With increasing compressive strain, load transitions between multiple backbone paths appear in the network structure. Thus, the simulation model provides insight into the compression process. Moreover, the simulation model enables the examination of the influence of various model parameters and facilitates the evaluation of the power–law relationship between the elasticity modulus and porosity of aerogels.

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On the Size Effect of Gelation Kinetics in RF Aerogels

Cited by 9 publications

References 14 publications

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method

The effect of synthesis conditions and process parameters on aerogel properties

Analysis of the microstructural connectivity and compressive behavior of particle aggregated silica aerogels

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