Spray coating of cellulose aerogel particles in a miniaturized spouted bed

Schroeter, Baldur; Yonkova, Velislava P.; Goslinska, M.; Orth, Maike; Pietsch, Swantje; Gurikov, Pavel; Смирнова, Ирина; Heinrich, Stefan

doi:10.1007/s10570-021-04032-0

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…Moreover, the release of the loaded compounds can vary based on the thickness of the surface. Previously, Schroeter et al [ 25 ] reported that coating cellulose aerogels resulted in a more controlled drug release.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Porous Spherical Beads from Corn Starch by Using a 3D Food Printing System

Ahmadzadeh

Ubeyitogullari

2022

Foods

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This study introduces a 3D food printing approach to fabricate spherical starch beads with small sizes and high porosity for the first time. The results illustrated that 3D food printing could generate starch beads in different sizes depending on the nozzle diameter, printing pressure, and ink viscosity. The 3D-printed beads were characterized for their morphology, crystallinity, and textural properties, while the starch-based ink was analyzed for its rheological properties. A suitable printing was attained when viscosity was in the range of 1000–1200 Pa.s at a low shear rate (˂0.1 s−1). Among the starch concentrations (10–15%, w/w) investigated, 15% starch concentration provided the best control over the shape of the beads due to its high storage modulus (8947 Pa), indicating higher gel strength. At this condition, the starch beads revealed an average size of ~650 µm, which was significantly smaller than the beads produced with other starch concentrations (10 and 12.5%), and had a density of 0.23 g/cm3. However, at lower starch concentrations (10%), the beads were not able to retain their spherical shape, resulting in larger beads (812–3501 µm). Starch crystallinity decreased by gelatinization, and the starch beads exhibited a porous structure, as observed from their SEM images. Overall, 3D food printing can be an alternative approach to preparing porous beads for the delivery of bioactive compounds with high precision.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Porous Spherical Beads from Corn Starch by Using a 3D Food Printing System

Ahmadzadeh

Ubeyitogullari

2022

Foods

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“…For instance, high sphericity is a prerequisite for controlled release purposes or for further spray coating of aerogels beads. [ 39 ] Particles with low sphericity are desirable in all fields, which benefit from an entanglement of individual particles. Examples are the compression of aerogel particles to slabs, which represent from aerogel processing view an efficient way to build up larger aerogel structures, or 3D‐printing of wet hydrogel particles.…”

Section: Discussionmentioning

confidence: 99%

Wet Milling of Alginate Alco‐ and Hydrogel Composites: A Facile Top‐Down Approach for Continuous Production of Aerogel Microparticles

Schroeter

Jeansathawong

Hajnal

et al. 2023

Macro Materials & Eng

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Moving toward high‐throughput production of biopolymer aerogel microparticles, in this work, the wet milling process is applied to hydrogels and alcogels. Alcogels are then converted into aerogels by well‐established supercritical drying. Alginate and hybrid alginate/silica gels are used as a model system. As the Young's moduli of hydrogels significantly change when water is exchanged by ethanol, it is possible to study the effect of the gel stiffness on macroscopic and microstructural properties of the resulting aerogels. Influence of process parameters (milling speed and gap size) is also investigated. Smallest particles sizes and minimal changes in microstructure are obtained for completely solvent exchanged gels. The wet milling is shown to be a versatile method to obtain aerogel particles with diameters in the range 50–300 µm.

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“…Deposition was possible on different substrates, and the film thickness was controlled by varying the number of spray cycles. The influence of some of these parameters on the film thickness of various sprayed materials was investigated in previous work. − The thin films obtained in this work are uniform, transparent, and electrically conductive (when they reach the percolation point); they have a typical highly porous, spongelike structure, low relative density, and very high porosity, although supercritical drying was not applied.…”

Section: Introductionmentioning

confidence: 95%

Porous Thin Films with Large Specific Surface Area on the Basis of Spray-Coated Metal Aerogels

Khavlyuk,

Shamraienko,

Tenhagen

et al. 2023

J. Phys. Chem. C

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The preparation of aerogels in the form of thin films deposited on a substrate (e.g., as an electrode material) is an attractive but challenging task. Such thin films are expected to combine the highly porous gel nanostructure, good mechanical stability, and a remarkably high specific surface area with efficient charge-carrier transport via the interconnected nanoparticle chains. All together, they make them attractive for the fabrication of (electro)catalysts or sensors for microfluidics, flexible electrodes for microelectronics, soft electrodes compatible with a stress-sensitive bioenvironment, etc. In this work, thin aerogel films of colloidal Pd and PtNi building blocks were prepared from the corresponding wet gels using a spray technique. The films were fabricated on substrates of around 1.5 cm2. During the modification of the substrates, the film thickness can be adjusted by controlling the ink content (flow rate, gas pressure, and temperature) and the number of spray cycles. In this way, both the electrical (down to R s = ∼0.2 kOhm/sq) and optical parameters of the thin porous films can be tuned. Comparative studies of the pore and surface structures of the films have confirmed their integrity and the highly porous structure typical for aerogels. In perspective, spray-coated aerogels can be easily adapted to industrial applications because upscaling is possible and expensive equipment such as supercritical or freeze-dryers is not required. It is important to note that the spray-coating technique is applicable through a mask or can be converted to inkjet printing, which allows for the desired micropatterning of aerogel thin films.

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Spray coating of cellulose aerogel particles in a miniaturized spouted bed

Cited by 11 publications

References 30 publications

Fabrication of Porous Spherical Beads from Corn Starch by Using a 3D Food Printing System

Fabrication of Porous Spherical Beads from Corn Starch by Using a 3D Food Printing System

Wet Milling of Alginate Alco‐ and Hydrogel Composites: A Facile Top‐Down Approach for Continuous Production of Aerogel Microparticles

Porous Thin Films with Large Specific Surface Area on the Basis of Spray-Coated Metal Aerogels

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