Porous microcapsules comprised inter-locked nano-particles by evaporation-induced assembly: Evaluation of dye sorption

Biswas, Priyanka; Sen, Debasis; Mazumder, S.; Ramkumar, Jayshree

doi:10.1016/j.colsurfa.2017.01.091

Cited by 14 publications

(9 citation statements)

References 55 publications

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“…Due to the possibility of assembling individual nanoparticles in a building block manner upon spray‐drying, the pore and void structure of the supraparticle can be controlled and thus the specific surface area adjusted, by choosing differently sized nanoparticles ,. Herein, four different sizes of primary silica nanoparticle building blocks were assembled to supraparticles.…”

Section: Resultsmentioning

confidence: 99%

“…As a model dye, methylene blue is often in focus and so it is in this study as well. For this sample dye, it can be found that already many materials have been proposed in earlier works to be suitable as adsorbers like activated carbon, natural clay materials, bioadsorbers like algae, agricultural solid wastes and silica based systems ,…”

Section: Introductionmentioning

confidence: 99%

“…Typically, adsorber capacities around 10 to 1000 mg/g have been reported . However, to achieve these adsorption results, typically, long contact times of several minutes to many hours were conducted ,…”

Section: Introductionmentioning

confidence: 99%

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Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

et al. 2018

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Herein, a particle system of so‐called raspberry‐like supraparticles, capable of dye removal from water within a few seconds, is presented. These particles are micron sized and assembled of smaller silica nanoparticles as adsorber and iron oxide nanoparticles which act, due to their superparamagnetic properties, as switchable magnets. With this particle design, it is possible to tailor the adsorber structure and adjust the magnetic properties. Using very small silica nanoparticles (10 nm) combined with superparamagnetic iron oxide nanoparticles (10 nm) to build the supraparticles resulted in a system which could clarify a deeply methylene blue dye colored water within 60 seconds via dye adsorption on the particles and their subsequent magnetic separation. A comparison with assembled supraparticles from larger primary nanoparticles revealed the role of the primary nanoparticles to create a porous particle structure which comes with an apparent capillary effect to take up the dye. The system could be regenerated either thermally or by acid treatment and reused consecutively as magnetically recoverable adsorber. Due to the building block principle of the system, modification towards other adsorption tasks should be easily possible. This therefore turns such particle systems into an ideal platform to build tailored adsorbers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

et al. 2018

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“…Over the years, porous materials [1] have found numerous applications in technology and in everyday life [2][3][4][5][6][7][8][9]. In this regard, synthesis of material with defined shape, pore size and specific surface area are indeed desirable, as these attributes determine their utility for specific application.…”

Section: Introductionmentioning

confidence: 99%

Porous nano-structured micro-granules from silica-milk bi-colloidal suspension: Synthesis and characterization

Biswas

Sen

Mazumder

et al. 2017

Colloids and Surfaces B: Biointerfaces

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“…Supraparticles consisting of individual silica nanoparticles present a novel mesoporous sensor support. These micrometer sized hierarchical particles, which are assembled upon spray‐drying, have a raspberry‐like appearance . The spray‐drying technique affords high flexibility in terms of building block selection (comparable to a toolbox), i.e., it is possible to readily select the primary particle size or to combine various sizes within one supraparticle.…”

Section: Introductionmentioning

confidence: 99%

Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Wintzheimer

Oppmann

Dold

et al. 2019

Part & Part Syst Charact

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The detection of toxic gases, such as NH3 and CO, in the environment is of high interest in chemical, electronic, and automotive industry as even small amounts can display a health risk for workers. Sensors for the real‐time monitoring of these gases should be simple, robust, reversible, highly sensitive, inexpensive and show a fast response. The indicator supraparticles presented herein can fulfill all of these requirements. They consist of silica nanoparticles, which are assembled to supraparticles upon spray‐drying. Sensing molecules such as Reichardt's dye and a binuclear rhodium complex are loaded onto the microparticles to target NH3 and CO detection, respectively. The spray‐drying technique affords high flexibility in primary nanoparticle size selection and thus, easy adjustment of the porosity and specific surface area of the obtained micrometer‐sized supraparticles. This ultimately enables the fine‐tuning of the sensor sensitivity and response. For the application of the indicator supraparticles in a gas detection device, they can be immobilized on a coating. Due to their microscale size, they are large enough to poke out of thin coating layers, thus guaranteeing their gas accessibility, while being small enough to be applicable to flexible substrates.

show abstract

Porous microcapsules comprised inter-locked nano-particles by evaporation-induced assembly: Evaluation of dye sorption

Cited by 14 publications

References 55 publications

Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

Porous nano-structured micro-granules from silica-milk bi-colloidal suspension: Synthesis and characterization

Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

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