---
res:
  bibo_abstract:
  - Two different mesoporous silica materials (SBA-15 and MCM 41) were impregnated
    with four different, commercially available surfactants, namely, E5, PEG 200,
    C10E6, and Triton X-100. Differential scanning calorimetry was employed to confirm
    the confinement of the surfactants in the pores of their host materials. Dynamic
    nuclear polarization enhanced solid state 13C magic angle spinning (MAS) nuclear
    magnetic resonance (NMR) spectra were recorded for these materials, showing that
    both the direct as well as the indirect polarization transfer pathways are active
    for the carbons of the polyethylene glycol moieties of the surfactants. The presence
    of the indirect polarization pathway implies the presence of molecular motion
    with correlation times faster than the inverse Larmor frequency of the observed
    signals. The intensities of the signals were determined, and an approach based
    on relative intensities was employed to ensure comparability throughout the samples.
    From these data, the interactions of the surfactants with the pore walls could
    be determined. Additionally, a model describing the surfactants’ arrangement in
    the pores was developed. It was concluded that all carbons of the hydrophilic
    surfactants, E5 and PEG 200, interact with the silica walls in a similar fashion,
    leading to similar polarization transfer pathway patterns for all observed signals.
    For the amphiphilic surfactants C10E6 and Triton X-100, the terminal hydroxyl
    group mediates the majority of the interactions with the pore walls and the polarizing
    agent. Two different mesoporous silica materials (SBA-15 and MCM 41) were impregnated
    with four different, commercially available surfactants, namely, E5, PEG 200,
    C10E6, and Triton X-100. Differential scanning calorimetry was employed to confirm
    the confinement of the surfactants in the pores of their host materials. Dynamic
    nuclear polarization enhanced solid state 13C magic angle spinning (MAS) nuclear
    magnetic resonance (NMR) spectra were recorded for these materials, showing that
    both the direct as well as the indirect polarization transfer pathways are active
    for the carbons of the polyethylene glycol moieties of the surfactants. The presence
    of the indirect polarization pathway implies the presence of molecular motion
    with correlation times faster than the inverse Larmor frequency of the observed
    signals. The intensities of the signals were determined, and an approach based
    on relative intensities was employed to ensure comparability throughout the samples.
    From these data, the interactions of the surfactants with the pore walls could
    be determined. Additionally, a model describing the surfactants’ arrangement in
    the pores was developed. It was concluded that all carbons of the hydrophilic
    surfactants, E5 and PEG 200, interact with the silica walls in a similar fashion,
    leading to similar polarization transfer pathway patterns for all observed signals.
    For the amphiphilic surfactants C10E6 and Triton X-100, the terminal hydroxyl
    group mediates the majority of the interactions with the pore walls and the polarizing
    agent.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Sonja C.
      foaf_name: Döller, Sonja C.
      foaf_surname: Döller
  - foaf_Person:
      foaf_givenName: Martin
      foaf_name: Brodrecht, Martin
      foaf_surname: Brodrecht
  - foaf_Person:
      foaf_givenName: Torsten
      foaf_name: Gutmann, Torsten
      foaf_surname: Gutmann
      foaf_workInfoHomepage: http://www.librecat.org/personId=118165
  - foaf_Person:
      foaf_givenName: Markus
      foaf_name: Hoffmann, Markus
      foaf_surname: Hoffmann
  - foaf_Person:
      foaf_givenName: Gerd
      foaf_name: Buntkowsky, Gerd
      foaf_surname: Buntkowsky
  bibo_doi: 10.1021/acs.jpcc.3c01946
  bibo_issue: '25'
  bibo_volume: 127
  dct_date: 2023^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1932-7447
  dct_language: eng
  dct_publisher: American Chemical Society@
  dct_title: Direct and Indirect DNP NMR Uncovers the Interplay of Surfactants with
    Their Mesoporous Host Material@
...