Porous materials from oppositely charged nanoparticle gel emulsions

Pentyala, Phanikumar; Shahid, Mohamed; Ramamirtham, Sashikumar; Basavaraj, Madivala G.

doi:10.1016/j.colsurfa.2018.02.026

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…From these results, we can conclude that the emulsions are gellike, have sufficient strength, and thus can be moulded into any shape for further processing. 55,56 We have also performed oscillatory shear rheology (amplitude sweep) of aggregate dispersion at 5 wt % total particle concentration, the results of which are presented in Figure S7 in the Supporting Information. Similar to emulsion gels, the heteroaggregated dispersions also show viscoelastic behavior because of the presence of the volume spanning network of the fumed oxide aggregate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Porous Ceramics via Processable Pickering Emulsion Stabilized by Oppositely Charged Colloids

2020

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We report a method to produce processable Pickering emulsions in which electrostatic heteroaggregation of oppositely charged fumed silica and alumina particles is exploited. The ability of weakly charged heteroaggregates to adsorb to the oil–water interface favors the formation of highly stable emulsions. A control over the microstructure and rheology of the Pickering emulsion is demonstrated by tuning parameters such as composition, pH, and total concentration of particles. The Pickering emulsions formed under optimal conditions are found to be gel-like and are excellent templates for the fabrication of porous ceramics. Furthermore, the porous mullite ceramic structure which has exceptional thermal and chemical resistance under harsh environments is obtained by drying and sintering of the emulsion template. The phase evolution, microstructure, and porosity of the resulting ceramic are characterized.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Porous Ceramics via Processable Pickering Emulsion Stabilized by Oppositely Charged Colloids

2020

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“…In spite of the enormous potential, the principles of heteroaggregation have not been adequately utilized, especially in porous material development. Nonetheless, some studies have focused on the fabrication of highly macroporous ceramic using a heteroaggregation-based dispersion processing route. , Another approach to producing porous materials is by using gels formed by exploiting heteroaggregation. , We have introduced a new processing method which involves the incorporation of oil drops into colloidal gels formed via the electrostatic heteroaggregation of particles that enables the development of ceramics with pores in the 20–60 μm size range . The porous material is obtained by the removal of oil drops and water trapped in the particle network via controlled drying followed by sintering.…”

Section: Porous Materials Developmentmentioning

confidence: 99%

Electrostatic Heteroaggregation: Fundamentals and Applications in Interfacial Engineering

et al. 2023

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The aggregation of oppositely charged soft materials (particles, surfactants, polyelectrolytes, etc.) that differ in one or more physical or chemical attributes, broadly referred to as electrostatic heteroaggregation, has been an active area of research for several decades now. While electrostatic heteroaggregation (EHA) is relevant to diverse fields such as environmental engineering, food technology, and pharmaceutical formulations, more recently there has been a resurgence to explore various aspects of this phenomenon in the context of interface stabilization and the development of functional materials. In this Feature Article, we provide an overview of the recent contributions of our group to this exciting field with particular emphasis on fundamental studies of electrostatic heteroaggregation between oppositely charged systems in the bulk, at interfaces, and across the bulk/interface. The influence of the size and shape of particles and the surface charge of heteroaggregates on the formation of Pickering emulsions and their utilization in the development of porous ceramics is discussed.

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“…SEM images to determine the projects pore area ( (Yang et al;Pentyala et al, 2018;Zou, 2020). The projected pore areas were measured using ImageJ software.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

What to Wear: The Filtration Performance of Alternative Materials Used to Construct Do-It-Yourself Masks

Mirrielees

Chen

Moreno

et al. 2021

Aerosol Air Qual. Res.

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The COVID-19 pandemic has shown that much of the world, including the United States, is illprepared for the material demands of a global crisis. In response to this shortage of Personal Protective Equipment (PPE), we have conducted filtration efficiency and pressure drop testing of a range of common materials used for constructing do-it-yourself masks, including an allergen filter, a vacuum bag, a heavy-duty tool wipe, and a standard cotton bandana, as well as a standard 3-ply surgical mask, a medical drape and an industrially available composite filter material. Size-resolved percent penetration of each material by particles with diameters ranging from 25 to 500 nm was measured at three face velocities (0.72 cm s -1 , 4.30 cm s -1 , 13.0 cm s -1 ). The allergen filter performed best, only allowing the penetration of 5% ± 3% of the 300 nm particles through the material at a face velocity of 13.0 cm s -1 , comparable to human breathing during heavy physical work. In comparison, the surgical mask and the cotton bandana allowed 39 ± 1% and 51% ± 1% of the 300 nm particles to pass through at the same face velocity, respectively. According to the calculated filter quality, the best choices for mask construction are the allergen filter, industrial composite filter, and the vacuum bag. Structure and morphology of the materials were characterized by scanning electron microscopy (SEM), image analysis, and thickness measurements to investigate physical characteristics which improve filtration. This study shows that certain household and commercially available materials and combinations can be used in the construction of highly effective face masks.

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Porous materials from oppositely charged nanoparticle gel emulsions

Cited by 9 publications

References 26 publications

Porous Ceramics via Processable Pickering Emulsion Stabilized by Oppositely Charged Colloids

Porous Ceramics via Processable Pickering Emulsion Stabilized by Oppositely Charged Colloids

Electrostatic Heteroaggregation: Fundamentals and Applications in Interfacial Engineering

What to Wear: The Filtration Performance of Alternative Materials Used to Construct Do-It-Yourself Masks

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