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Influence of Nanoconfinement on the pKa of Polyelectrolyte Functionalized Silica Mesopores

Brilmayer, Robert ; Kübelbeck, Sonja ; Khalil, Adnan ; Brodrecht, Martin ; Kunz, Ulrike ; Kleebe, Hans-Joachim ; Buntkowsky, Gerd ; Baier, Grit ; Andrieu‐Brunsen, Annette (2021)
Influence of Nanoconfinement on the pKa of Polyelectrolyte Functionalized Silica Mesopores.
In: Advanced Materials Interfaces, 2020, 7 (7)
doi: 10.26083/tuprints-00019915
Artikel, Zweitveröffentlichung, Verlagsversion

WarnungEs ist eine neuere Version dieses Eintrags verfügbar.

Kurzbeschreibung (Abstract)

Functionalized ordered mesoporous materials are relevant in technologies, such as drug release, sensing, and separation. To design functionality, the silica framework can be functionalized with responsive molecules or polymers. Often, the pH value in those hybrid materials determines performance. Even though pH/pKa differences between polymers in bulk solutions and nanoscale confinement have been observed, the influence of confinement on pH- and pore filling dependent polyelectrolyte oligomer chain charge has yet not been investigated systematically. Here, mesoporous silica films are functionalized with (2-dimethylamino)ethyl methacrylate) (DMAEMA) and 2-(methacryloyloxy)ethyl phosphate (MEP) oligomers using photoiniferter initiated polymerization. This approach allows a controlled and environmentally friendly mesopore functionalization in water. The obtained oligomer functionalized pores are tunable with respect to pore filling. For both, poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and poly(2-(methacryloxy)ethyl phosphate) (PMEP), the charge generation inside mesopore confinement is significantly delayed toward harsher pH conditions resulting in pKa shifts of 1–2 pH units. Polymer amount and ionic strength show to further influence the pKa of PDMAEMA in mesopores. The technological importance of the pH value in confinement and its effect on enzyme stabilization is demonstrated. Lipase from Aspergillus oryzae loses its activity upon encapsulation in silica nanoparticles at pH values where the enzyme is stable in bulk solution.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Brilmayer, Robert ; Kübelbeck, Sonja ; Khalil, Adnan ; Brodrecht, Martin ; Kunz, Ulrike ; Kleebe, Hans-Joachim ; Buntkowsky, Gerd ; Baier, Grit ; Andrieu‐Brunsen, Annette
Art des Eintrags: Zweitveröffentlichung
Titel: Influence of Nanoconfinement on the pKa of Polyelectrolyte Functionalized Silica Mesopores
Sprache: Englisch
Publikationsjahr: 2021
Publikationsdatum der Erstveröffentlichung: 2020
Verlag: Wiley
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Advanced Materials Interfaces
Jahrgang/Volume einer Zeitschrift: 7
(Heft-)Nummer: 7
Kollation: 10 Seiten
DOI: 10.26083/tuprints-00019915
URL / URN: https://tuprints.ulb.tu-darmstadt.de/19915
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Herkunft: Zweitveröffentlichungsservice
Kurzbeschreibung (Abstract):

Functionalized ordered mesoporous materials are relevant in technologies, such as drug release, sensing, and separation. To design functionality, the silica framework can be functionalized with responsive molecules or polymers. Often, the pH value in those hybrid materials determines performance. Even though pH/pKa differences between polymers in bulk solutions and nanoscale confinement have been observed, the influence of confinement on pH- and pore filling dependent polyelectrolyte oligomer chain charge has yet not been investigated systematically. Here, mesoporous silica films are functionalized with (2-dimethylamino)ethyl methacrylate) (DMAEMA) and 2-(methacryloyloxy)ethyl phosphate (MEP) oligomers using photoiniferter initiated polymerization. This approach allows a controlled and environmentally friendly mesopore functionalization in water. The obtained oligomer functionalized pores are tunable with respect to pore filling. For both, poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and poly(2-(methacryloxy)ethyl phosphate) (PMEP), the charge generation inside mesopore confinement is significantly delayed toward harsher pH conditions resulting in pKa shifts of 1–2 pH units. Polymer amount and ionic strength show to further influence the pKa of PDMAEMA in mesopores. The technological importance of the pH value in confinement and its effect on enzyme stabilization is demonstrated. Lipase from Aspergillus oryzae loses its activity upon encapsulation in silica nanoparticles at pH values where the enzyme is stable in bulk solution.

Status: Verlagsversion
URN: urn:nbn:de:tuda-tuprints-199152
Sachgruppe der Dewey Dezimalklassifikatin (DDC): 500 Naturwissenschaften und Mathematik > 540 Chemie
Fachbereich(e)/-gebiet(e): DFG-Sonderforschungsbereiche (inkl. Transregio)
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen > Projektbereich C: Neue und verbesserte Anwendungen
DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1194: Wechselseitige Beeinflussung von Transport- und Benetzungsvorgängen > Projektbereich C: Neue und verbesserte Anwendungen > C04: Dynamische Benetzungssteuerung und der Einfluss auf ionischen Stofftransport in mesoporöse Filme
Hinterlegungsdatum: 19 Nov 2021 13:14
Letzte Änderung: 01 Dez 2021 12:46
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