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Proton-Conducting Sulfonated Periodic Mesoporous Organosilica.

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Title: Proton-Conducting Sulfonated Periodic Mesoporous Organosilica.
Authors: Wagner, Tobias1 (AUTHOR), Tiemann, Michael1 (AUTHOR) michael.tiemann@upb.de
Source: Nanomaterials (2079-4991). Feb2026, Vol. 16 Issue 3, p203. 12p.
Subjects: Proton conductivity, X-ray powder diffraction, Physisorption, Ion-permeable membranes, Surface active agents, Fuel cells
Abstract: Proton exchange membranes (PEMs) are essential for fuel cells, yet conventional materials like Nafion suffer from humidity dependence and limited thermal stability. This study introduces sulfonated phenylene-bridged periodic mesoporous organosilicas (PMOs) as promising inorganic–organic hybrid PEMs, synthesized via surfactant-templating with varying alkyl chain lengths for different mesopore sizes. Post-synthetic functionalization involves nitration of phenylene moieties, reduction to amines, and ring-opening of propane or butane sultones to graft sulfonic acid groups via flexible spacers, achieving homogeneous distribution along pore walls. Post-functionalization is confirmed by powder X-ray diffraction (PXRD), revealing preserved 2D hexagonal p6mm ordering and phenylene stacking. N2 physisorption shows type IV isotherms with reduced pore volumes and pore sizes. 1H NMR is used to quantify functionalization degrees. Impedance spectroscopy on pressed pellets demonstrates proton conductivities up to 2 × 10−3 S cm−1 at 30 °C and 90% RH, depending on the functionalization degree, confirming sulfonic acid-mediated conduction. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Proton-Conducting Sulfonated Periodic Mesoporous Organosilica.
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  Data: <searchLink fieldCode="AR" term="%22Wagner%2C+Tobias%22">Wagner, Tobias</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tiemann%2C+Michael%22">Tiemann, Michael</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> michael.tiemann@upb.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Feb2026, Vol. 16 Issue 3, p203. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Proton+conductivity%22">Proton conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+powder+diffraction%22">X-ray powder diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink><br /><searchLink fieldCode="DE" term="%22Ion-permeable+membranes%22">Ion-permeable membranes</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+active+agents%22">Surface active agents</searchLink><br /><searchLink fieldCode="DE" term="%22Fuel+cells%22">Fuel cells</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Proton exchange membranes (PEMs) are essential for fuel cells, yet conventional materials like Nafion suffer from humidity dependence and limited thermal stability. This study introduces sulfonated phenylene-bridged periodic mesoporous organosilicas (PMOs) as promising inorganic–organic hybrid PEMs, synthesized via surfactant-templating with varying alkyl chain lengths for different mesopore sizes. Post-synthetic functionalization involves nitration of phenylene moieties, reduction to amines, and ring-opening of propane or butane sultones to graft sulfonic acid groups via flexible spacers, achieving homogeneous distribution along pore walls. Post-functionalization is confirmed by powder X-ray diffraction (PXRD), revealing preserved 2D hexagonal p6mm ordering and phenylene stacking. N2 physisorption shows type IV isotherms with reduced pore volumes and pore sizes. 1H NMR is used to quantify functionalization degrees. Impedance spectroscopy on pressed pellets demonstrates proton conductivities up to 2 × 10−3 S cm−1 at 30 °C and 90% RH, depending on the functionalization degree, confirming sulfonic acid-mediated conduction. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3390/nano16030203
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 203
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      – SubjectFull: Proton conductivity
        Type: general
      – SubjectFull: X-ray powder diffraction
        Type: general
      – SubjectFull: Physisorption
        Type: general
      – SubjectFull: Ion-permeable membranes
        Type: general
      – SubjectFull: Surface active agents
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      – SubjectFull: Fuel cells
        Type: general
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              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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