Ultralight magnetic aerogels from Janus emulsions

Raju, Rajarshi Roy; Liebig, Ferenc; Klemke, Bastian; Koetz, Joachim

doi:10.1039/c9ra10247g

Cited by 8 publications

(7 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, these materials entail several drawbacks such as their lack of biodegradability or the non-renewable origin of their building blocks. Consequently, hydrogels − or hydrogel composites − based on various biopolymers have been examined extensively as materials for the sorption of ions due to their low cost, biocompatibility, and biodegradability. , For example, the removal of the cationic dye methylene blue from aqueous solutions was demonstrated not only for hydrogels based on cellulose–graft–acrylic acid but also for chitosan–halloysite composite hydrogels . Furthermore, foamed hydrogels have also been examined for the sorption of heavy metal ions , or organic dyes , via ion exchange.…”

Section: Introductionmentioning

confidence: 99%

“…As this results in a net negative charge at a neutral pH, hydrogels based on gelatin methacryloyl are potential materials for the sorption of cations via ion exchange. In fact, gelatin has often been used as part of a polymer mixture whose sorption capability is studied. ,, However, the contribution of gelatin regarding the sorption of ions remains unclear and has not yet been thoroughly characterized. One aspect that is also highly relevant in the field of sorption is the reusability of the material, especially for adsorbers used, e.g., in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gelatin-Based Foamed and Non-foamed Hydrogels for Sorption and Controlled Release of Metoprolol

Dehli

Poole

Southan

2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

The influence of gelatin methacryloyl hydrogel morphology on the sorption and release behavior of metoprolol was studied for both equilibrium and non-equilibrium conditions. For samples examined in equilibrium conditions, no influence of the sample morphology was observed. The maximum sorption capacity q max was determined to be 530 μmol g −1 . Furthermore, up to 100% of the sorbed drug was released from both foamed and non-foamed samples upon immersion into salt solutions, which demonstrates the regenerability of the material. By contrast, the sample morphology strongly influenced the sorption and release kinetics. We found that the sorption and release rate coefficients k increased up to 10 times for foamed hydrogels as compared to non-foamed hydrogels. Furthermore, k increased with increasing ion concentration in the sorption and release medium. This effect was more pronounced for non-foamed hydrogels. The obtained results indicate that the sorption and release rate can be controlled by the morphology of the sorbents and, to some extent, by the ion concentration of the surrounding medium.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gelatin-Based Foamed and Non-foamed Hydrogels for Sorption and Controlled Release of Metoprolol

Dehli

Poole

Southan

2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…Janus emulsions containing two non-mixable oil components dispersed in water have attracted great interest in different fields of application; they are superior to single emulsions because of the different interfaces and advanced morphological structures [1][2][3][4][5][6]. Different strategies for the preparation of Janus emulsions are already well established, e.g., by microfluidic processes [7,8] or one-step vortex mixing in a mini shaker [4][5][6]9,10]. Numerical analysis has shown that the angles at the contact line between three liquids can be calculated from experimentally obtained interfacial tensions [11].…”

Section: Introductionmentioning

confidence: 99%

Inner Rotation of Pickering Janus Emulsions

Raju

Koetz

2021

Nanomaterials

Self Cite

View full text Add to dashboard Cite

Janus droplets were prepared by vortex mixing of three non-mixable liquids, i.e., olive oil, silicone oil and water, in the presence of gold nanoparticles (AuNPs) in the aqueous phase and magnetite nanoparticles (MNPs) in the olive oil. The resulting Pickering emulsions were stabilized by a red-colored AuNP layer at the olive oil/water interface and MNPs at the oil/oil interface. The core–shell droplets can be stimulated by an external magnetic field. Surprisingly, an inner rotation of the silicon droplet is observed when MNPs are fixed at the inner silicon droplet interface. This is the first example of a controlled movement of the inner parts of complex double emulsions by magnetic manipulation via interfacially confined magnetic nanoparticles.

show abstract

“…An emulsion is a metastable system but can be stabilized by a suitable surfactant, which generally consists of two immiscible liquid phases with one phase dispersed into the second. 1 Recently, complex emulsions, including multiple emulsions 1,2 and Janus emulsions, 3,4 have promising applications in foods, 5 chemical separations, 6 sensors, 7 drug delivery, 8 microcapsules fabrication. 9,10 Multiple emulsions are often generated through a two-step method.…”

Section: Introductionmentioning

confidence: 99%