267. Reactions in aqueous solutions of sodium metaperiodate exposed to artificial light

Head, Frank S. H.; Standing, H. A.

doi:10.1039/jr9520001457

Cited by 23 publications

(8 citation statements)

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“…CNF were oxidized to dialdehyde CNF (DACNF) by slowly adding 2.5 g NaIO 4 to 500 mL of a 0.5 wt % CNF suspension in deionized water (weight NaIO 4 :CNF = 1:1) and subsequently stirring in a beaker for 4 h at room temperature. The beaker was wrapped in aluminum foil to prevent light-induced decomposition of periodate and undesired side reactions . The DACNF suspension was filtered and washed with deionized water until the conductivity of the filtrate was <5 μS cm –1 .…”

Section: Methodsmentioning

confidence: 99%

Antioxidant and UV-Blocking Leather-Inspired Nanocellulose-Based Films with High Wet Strength

Kriechbaum

Bergström

2020

Biomacromolecules

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The mechanical performance in the wet state needs to be significantly improved and the intrinsic functionalities should be fully utilized to promote the replacement of fossil-based plastics with renewable biobased materials. We demonstrate a leatherinspired approach to produce multifunctional materials with a high wet strength that is based on tannin-induced precipitation of gelatin grafted onto surface-modified cellulose nanofibrils (CNF). The leather-inspired CNF-based films had a wet tensile strength of 33 MPa, a Young's modulus of 310 MPa, and a strain at failure of 22%, making the wet materials stronger than, for example, dry conventional low-density polyethylene and more ductile than paper-based food packaging materials. The tannin-containing films displayed excellent antioxidant and UV-blocking properties, rapidly scavenging more than 90% of added free radicals and absorbing 100% of light in the UV-B/UV-C range. This work illustrates the prospect of combining renewable materials in a leather-inspired approach to form wet strong and multifunctional films with potential application in food packaging.

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Section: Methodsmentioning

confidence: 99%

Antioxidant and UV-Blocking Leather-Inspired Nanocellulose-Based Films with High Wet Strength

Kriechbaum

Bergström

2020

Biomacromolecules

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“…The mixture was subsequently mixed with an Ultra Turrax (IKA Werke GmbH & Co. KG, Staufen, Germany) at 10 000 rpm for 5 min before the oxidation was continued without mixing or agitation for one hour in the absence of light to avoid photodegradation of the periodate as well as unwanted side-reactions. 25 The reaction was then quenched by the addition of a stoichiometric excess of ethylene glycol. Aer 2 h, the oxidized CNFs were washed exhaustively with water to remove remaining ethylene glycol and oxidation products from the quenching.…”

Section: Methodsmentioning

confidence: 99%

On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels

et al. 2018

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“…The periodate solution was wrapped with aluminum foil and was kept in the dark. Solutions of periodate are known to undergo photochemical decomposition 27 . Buffer solutions were made up of KHC 8 H 4 O 4 /HClO 4 solutions of known concentrations.…”

Section: Methodsmentioning

confidence: 99%

Kinetics and mechanism of the one‐step, two‐electron oxidation of diaquadichloro(1,10‐phenanthroline)chromium(III) chloride dihydrate by periodate to chromium(V) in aqueous acidic solutions

Eltahir

Ali

Sulfab

2021

Int J of Chemical Kinetics

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The kinetics of oxidation of [CrIIICl2(phen)(H2O)2]Cl⋅2H2O (phen = 1,10‐phenanthroline) by periodate {I(VII)} have been studied in aqueous acidic solutions. The oxidation product has been isolated and characterized by elemental analysis, IR, and ESR as [CrVCl2(phen)(O)]Cl⋅1.5H2O. Under pseudo–first‐order conditions, the reaction showed first‐order dependence on the initial Cr(III) complex concentration. At fixed reaction conditions, the dependence of kobs on [I(VII)] showed saturation kinetics. The rate constant, kobs, increased with increasing pH, indicating that the hydroxo form of the chromium(III) complex is the most reactive species. A plot of kobs([H+] + K1) versus [H+] is linear with an intercept, indicating that the reaction proceeds via two parallel pathways. One pathway is independent of [H+] and the other on [H+]–1. Since water is known to be a very weak bridging ligand, the pathway involving the aqua form of the complex, almost certainly, is bridged to periodate via the chloro ligand of the chromium(III) complex. The thermodynamic parameters of the processes involved are reported. A one‐step two‐electron transfer via an inner‐sphere mechanism has been assigned to the two pathways based on the form of the rate law

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267. Reactions in aqueous solutions of sodium metaperiodate exposed to artificial light

Cited by 23 publications

References 0 publications

Antioxidant and UV-Blocking Leather-Inspired Nanocellulose-Based Films with High Wet Strength

Antioxidant and UV-Blocking Leather-Inspired Nanocellulose-Based Films with High Wet Strength

On the mechanism behind freezing-induced chemical crosslinking in ice-templated cellulose nanofibril aerogels

Kinetics and mechanism of the one‐step, two‐electron oxidation of diaquadichloro(1,10‐phenanthroline)chromium(III) chloride dihydrate by periodate to chromium(V) in aqueous acidic solutions

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