Starch aerogel beads obtained from inclusion complexes prepared from high amylose starch and sodium palmitate

Kenar, James A.; Eller, Fred J.; Felker, Frederick C.; Jackson, Michael A.; Fanta, George F.

doi:10.1039/c3gc41895b

Cited by 68 publications

(47 citation statements)

References 36 publications

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“…Der gängigste Gelbildungsweg für Stärke ist ein wärmeunterstütztes Hydratations‐Plastifizierungs‐Verfahren in drei Schritten: i) Quellen durch Adsorption von Wasser, ii) irreversible physikalische und strukturelle Veränderungen durch wärmeinduzierte Gelbildung und iii) partielles Umkristallisieren durch Abkühlen und Reifen. Alternativ dazu können Stärkederivate in kationische oder anionische Polymere umgewandelt werden, die durch ionische Wechselwirkungen gelieren können . Die Anteile von Amylose und Amylopectin in Stärke hängen von der Quelle ab (Mais, Erbsen, Tapioka, Kartoffel und Weizen) und wirken sich auf die Kristallinität und die Endeigenschaften aus: Amylose fördert eine amorphe Struktur und hohe Mesoporosität, während Amylopectin eine besser geordnete lokale Struktur mit höherer Kristallinität begünstigt .…”

Section: Biopolymer‐aerogelsystemeunclassified

“…Alternativ dazu können Stärkederivate in kationische oder anionische Polymere umgewandelt werden, die durch ionische Wechselwirkungen gelieren können . Die Anteile von Amylose und Amylopectin in Stärke hängen von der Quelle ab (Mais, Erbsen, Tapioka, Kartoffel und Weizen) und wirken sich auf die Kristallinität und die Endeigenschaften aus: Amylose fördert eine amorphe Struktur und hohe Mesoporosität, während Amylopectin eine besser geordnete lokale Struktur mit höherer Kristallinität begünstigt . Zusätzlich fördern schnelles Abkühlen und tiefe Temperaturen die Keimbildung über Wachstum und liefern große Oberflächen …”

Section: Biopolymer‐aerogelsystemeunclassified

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Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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Biopolymer‐Aerogele gehören zu den ersten Aerogelen, die hergestellt wurden, aber erst im letzten Jahrzehnt kam es zu einer Belebung der Forschung über Biopolymer‐ und Biopolymer‐Verbundstoff‐Aerogele, die durch Fragen der Nachhaltigkeit, einstellbare spezielle Eigenschaften und einfache Funktionalisierung motiviert wird. Biopolymer‐Aerogele und offenzellige Biopolymer‐Schäume haben Potenzial für klassische Aerogel‐Anwendungen wie Wärmedämmung und neue Anwendungen bei der Filtration, Öl‐Wasser‐Trennung, CO2‐Abscheidung, Katalyse und in der Medizin. Das Gebiet der Biopolymer‐Aerogele wird heute von der empirischen Materialentwicklung auf dem Labormaßstab beherrscht und benötigt eine bessere theoretische Grundlage und Test in Pilotanlagen. Unser Aufsatz umfasst eine Datenbank mit über 3800 Biopolymer‐Aerogel‐Eigenschaften, beurteilt den Forschungsstand auf dem Gebiet und diskutiert wissenschaftliche, technologische und wirtschaftliche Hindernisse bei der Kommerzialisierung dieser faszinierenden Materialien.

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Section: Biopolymer‐aerogelsystemeunclassified

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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“…Traditional methods such as air drying and lyophilization (freeze drying) suffer from several drawbacks. In the case of air drying, surface tension of the liquid contained in the small‐sized pores creates a capillary pressure gradient in the pore walls resulting in pore collapse and significant shrinkage of xerogels . Freeze‐drying may have a destructive effect on the cryogel structure due to the ice crystal formation and sublimation .…”

Section: Fabrication Of Porous Materialsmentioning

confidence: 99%

“…The scCO 2 drying excels traditional methods for aerogels preparation mainly for it avoids presence of intermediate vapor–liquid transition and surface tensions in the gel pores, thus, preventing the gel structure from the pore collapse phenomenon and shrinkage upon solvent removal . Given the high critical point (Pc = 22.1 MPa; Tc = 374°C) of water and its insolubility in scCO 2 , water phase in the starch hydrogel has to be replaced by a scCO 2 soluble solvent ( e.g ., ethanol or acetone) prior to supercritical drying, whereby the alco‐ or acetogel is obtained as an intermediate product . Stepwise volume change upon transformation of the corn starch (CS) hydrogel to the corresponding xero‐ and aerogel is presented in Fig.…”

Section: Fabrication Of Porous Materialsmentioning

confidence: 99%

Utilization of supercritical CO₂as a processing aid in setting functionality of starch-based materials

2016

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Modification of native starch enables fabrication of a broad spectrum of technologically valuable products for food and non-food applications. Given the increased public concern about food safety and rigorous environmental regulations, a special attention is paid to non-thermal and organic solvent-free treatments of the starch-based materials. Supercritical carbon dioxide (scCO 2 ) is considered to be an attractive processing aid for starch modification due to its unique physicochemical properties such as low viscosity, absence of surface tension, high diffusivity, tuneable density and controllable solvent strength, low critical parameters (7.38 MPa, 31.1°C), availability, and environmental acceptability. This is the first review on different use of scCO 2 as a processing aid in setting functionality of starch-based materials including scCO 2 -assisted gelatinization, fabrication of porous materials, impregnation, and chemical modification. In these processes, scCO 2 is used as a plasticizer, blowing agent, solvent, medium or anti-solvent to alter structural, and/or physicochemical properties of starch. The advantages of the scCO 2 -assisted processes for starch modification over the corresponding conventional techniques were discussed in detail.

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“…Starch foams have been produced by many techniques including extrusion, freeze‐drying/solvent exchange, hot‐mold baking/compression, and microwave heating . These foaming techniques usually require the use of either organic solvents, high‐operating temperatures, multistep processing with leaching or purification steps, or long processing times .…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

Peng

Runt

et al. 2018

Polymers for Advanced Techs

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Supercritical carbon dioxide (scCO2) processed thermoplastic starch (scCO2aTPS), cellulose nanofiber (CNF) modified scCO2aTPS (scCO2aTPS100CNF0.02) and glutaraldehyde (GA) modified scCO2aTPS100CNF0.02 (scCO2aTPS100CNF0.02GAx) foams were prepared for the first time using scCO2 as a blowing agent during their foaming processes. The expansion ratio, cell density, moisture resistance, and compressive strength (σc) retention properties of each foam series were considerably improved with increasing scCO2 pressure during the foaming processes. The expansion ratios and cell densities of each scCO2aTPS100CNF0.02GAx foam series were increased considerably to a maximum value, as the GA content approached an optimum value. The optimal scCO211TPS100CNF0.02GA1.6 foam material exhibited a high expansion ratio and cell density at approximately 50 and approximately 8 × 108 cells/cm3, respectively. Compared with corresponding aged scCO2aTPS and scCO2aTPS100CNF0.02 foam specimens, considerably better moisture resistance and σc retention properties were observed for scCO2aTPS100CNF0.02GAx foam specimens, when they were modified with the corresponding optimum GA content. The moisture resistance and σc retention for optimal prepared scCO27TPS100CNF0.02GA0.4, scCO29TPS100CNF0.02GA0.8 and scCO211TPS100CNF0.02GA1.6 foam materials improved further with increasing scCO2 pressure. Possible reasons accounting for the highly expansion ratio, moisture resistance, and σc retention properties for scCO2aTPS100CNF0.02GAx foams are presented.

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Starch aerogel beads obtained from inclusion complexes prepared from high amylose starch and sodium palmitate

Cited by 68 publications

References 36 publications

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Utilization of supercritical CO₂as a processing aid in setting functionality of starch-based materials

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

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Starch aerogel beads obtained from inclusion complexes prepared from high amylose starch and sodium palmitate

Cited by 68 publications

References 36 publications

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Utilization of supercritical CO2as a processing aid in setting functionality of starch-based materials

Thermoplastic starch and glutaraldehyde modified thermoplastic starch foams prepared using supercritical carbon dioxide fluid as a blowing agent

Contact Info

Product

Resources

About

Utilization of supercritical CO₂as a processing aid in setting functionality of starch-based materials