Combining robocasting and alkali-induced starch gelatinization technique for fabricating hierarchical porous SiC structures

Sun, Shihao; Xia, Qian; Feng, Dong; Qin, Zheng; Ru, Hongqiang

doi:10.1016/j.addma.2022.102938

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The surface damage or depressions on the starch granules were attributed to the leaching of amylose, which increased at higher extraction pH levels. According to Sun et al (2022), strong alkalis, such as NaOH penetrate the starch granules and react with lipids bound to amylose, leading to chemical instability in the amyloselipid complex.…”

Section: Starch Granule Morphologymentioning

confidence: 99%

The effects of alkaline extraction on the characteristics of lima bean (Phaseolus lunatus) starch

Palupi,

Estiasih,

Subroto

et al. 2024

Braz. J. Food Technol.

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This study provides an overview of the use of lima bean (Phaseolus lunatus L.) flour as a raw material for starch extraction in consecutive steps for the preparation of lima bean protein concentrate. The starch from lima bean flour was extracted at different alkaline pH levels: 7, 8, 9, 10, and 11. The physicochemical, microstructural, crystallinity, pasting, and functional properties of the extracted starch were evaluated. The results showed that the purity of the starch increased with a higher extraction pH. However, a further increase in pH reduced the yield. The alkaline-extracted starch still contained other non-starch compounds. The extraction pH affected the amylose content, presumably due to the interaction of OH- ions with the starch granular components, influencing the yield and amylose level. At lower pH levels, alkali promoted a more orderly granular structure, decreasing starch solubility and resulting in higher yield and amylose content. Meanwhile, at higher pH levels, alkali ions increased protein solubility and starch content. The pH had a slight influence on the starch granule morphology. Lima bean starch exhibited a crystallinity index of 29% to 34% depending on the alkaline extraction pH. All starches showed individual peaks at 2θ values of 15° and 23°, unresolved peaks at 2θ values of 17° and 18°, and a diffracted plane around 5.63°, indicating a C-type starch. After alkali treatment, the starch maintained its C-type structure, indicating no structural transformation in the orthorhombic and hexagonal structures. Increasing the extraction pH to 9 increased starch crystallinity, but a further increase in pH decreased it. Viscosity during pasting was affected by the intensive interaction of water with amylose in the amorphous regions. The extraction pH influenced peak, trough, setback, and final viscosity. The alkaline treatment might disrupt granular regions, altering the functional properties of the starch. Alkaline extraction of starch can be performed on lima bean flour.

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Section: Starch Granule Morphologymentioning

confidence: 99%

The effects of alkaline extraction on the characteristics of lima bean (Phaseolus lunatus) starch

Palupi,

Estiasih,

Subroto

et al. 2024

Braz. J. Food Technol.

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“…The ability to tailor shape and size of fabricated parts is a great advantage that enables modulating the catalyst's macroscopic aspects. A variety of different additive manufacturing methods has recently emerged, enabling the construction of highly sophisticated materials such as shape memory alloys [12] fabricated through wire-based directed energy deposition, biodegradable polymers produced through stereolithography [13], and hierarchically porous structures fabricated through robocasting [14]. Although each method presents its own strengths and weaknesses, they are all based on the same principals, where the three-dimensional object is designed through a computer-aided design software, followed by a slicing procedure that reproduces the part layer by layer.…”

Section: Introductionmentioning

confidence: 99%

Influence of binder concentration in zeolitic ZSM-5/bentonite 3D-printed monoliths manufactured through robocasting for catalytic applications

Koltsakidis

Koidi

Lappas

et al. 2023

Int J Adv Manuf Technol

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In this work, a 3D printing method, robocasting was utilized to manufacture zeolite ZSM-5-based woodpile monolith catalysts of approximately 10-mm diameter, using bentonite clay as binding matrix. The effect of three different binder concentrations, in the 40–60 wt.% range, on the rheological, physicochemical, and mechanical properties was examined. The rheometer measurements showed that the printing pastes have identical shear thinning behavior and demonstrate sufficient storage modulus, irrespective of the binder concentration. The printed monoliths had high BET surface areas and porosity. The results showed that the ZSM-5 crystals retained their porous structure, textural characteristics, and crystalline structure during the additive manufacturing process. Pyridine FTIR measurements demonstrated reduced total acidity and number of Brønsted acid sites in the final specimens due to the dilution with the bentonite powder. However, the acidity reduction was roughly proportional to the binder concentration, signifying that the ZSM-5 crystallites also retain their acidity during the robocasting printing. Finally, the mechanical reliability of the thermally treated monoliths was determined by calculating the Weibull modulus values through linear regression of the Weibull equation. The increase in the binder concentration increased the compression strength by a factor of 4.5 and achieved superior mechanical reliability. Graphical abstract

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“…Due to their ability to perform multiple tasks simultaneously, such materials are widely used in catalytic carriers, high-temperature gas filtration, supercapacitors, porous burners, etc. [ 11 , 12 , 13 , 14 ]. Therefore, to achieve versatility, it has been necessary to develop porous structures with both high porosity and different pore sizes.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of SiC Porous Ceramics by Foaming Method

et al. 2023

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In this work, hierarchically porous SiC ceramics were prepared via the foaming method. Porous ceramics with tunable, uniform, and bimodal pore structures were successfully fabricated in a facile way. The formation mechanisms of the 1st and 2nd modal macropores are the H2O2 foaming process and SiC particle overlap, respectively. The effect of pore-foaming agent amount, foaming temperature, and surfactant was investigated. According to the results, with increasing H2O2 amount, the porosity, pore size, and interconnectivity of the 1st modal pores increased, whereas bulk density and strength decreased. The porosity increased while the strength decreased as the foaming temperature increased. Surfactants increased pore interconnectivity and porosity. When the foaming temperature was 85 °C, and the addition of H2O2 was 5 wt.%, the porosity, bulk density, flexural strength, and compressive strength were 56.32%, 2.8301 g/cm3, 11.94 MPa, and 24.32 MPa, respectively. Moreover, SiC porous ceramics exhibited excellent corrosion resistance to acids and alkalis.

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Combining robocasting and alkali-induced starch gelatinization technique for fabricating hierarchical porous SiC structures

Cited by 8 publications

References 38 publications

The effects of alkaline extraction on the characteristics of lima bean (Phaseolus lunatus) starch

The effects of alkaline extraction on the characteristics of lima bean (Phaseolus lunatus) starch

Influence of binder concentration in zeolitic ZSM-5/bentonite 3D-printed monoliths manufactured through robocasting for catalytic applications

Fabrication of SiC Porous Ceramics by Foaming Method

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