Mesoporous Silica Nanoparticles Loaded with Surfactant: Low Temperature Magic Angle Spinning 13C and 29Si NMR Enhanced by Dynamic Nuclear Polarization | Zendy

Olivier Lafon | Zendy; Aany Sofia Lilly Thankamony | Zendy; Takeshi Kobayashi | Zendy; Diego Carnevale | Zendy; Veronika Vitzthum | Zendy; Igor I. Slowing | Zendy; Kapil Kandel | Zendy; Hervé Vezin | Zendy; JeanPaul Amoureux | Zendy; Geoffrey Bodenhausen | Zendy; Marek Pruski | Zendy

Open Access

Mesoporous Silica Nanoparticles Loaded with Surfactant: Low Temperature Magic Angle Spinning ¹³C and ²⁹Si NMR Enhanced by Dynamic Nuclear Polarization

Author(s) -

Olivier Lafon,

Aany Sofia Lilly Thankamony,

Takeshi Kobayashi,

Diego Carnevale,

Veronika Vitzthum,

Igor I. Slowing,

Kapil Kandel,

Hervé Vezin,

JeanPaul Amoureux,

Geoffrey Bodenhausen,

Marek Pruski

Publication year - 2012

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp310109s

Subject(s) - mesoporous material , magic angle spinning , pulmonary surfactant , mesoporous silica , bromide , nanoparticle , spin diffusion , radical , chemistry , materials science , analytical chemistry (journal) , chemical engineering , diffusion , nuclear magnetic resonance spectroscopy , nanotechnology , inorganic chemistry , organic chemistry , catalysis , biochemistry , physics , thermodynamics , engineering

We show that dynamic nuclear polarization (DNP) can be used to enhance NMR signals of ¹³C and ²⁹Si nuclei located in mesoporous organic/inorganic hybrid materials, at several hundreds of nanometers from stable radicals (TOTAPOL) trapped in the surrounding frozen disordered water. The approach is demonstrated using mesoporous silica nanoparticles (MSN), functionalized with 3-(N-phenylureido)propyl (PUP) groups, filled with the surfactant cetyltrimethylammonium bromide (CTAB). The DNP-enhanced proton magnetization is transported into the mesopores via ¹H-¹H spin diffusion and transferred to rare spins by cross-polarization, yielding signal enhancements ε_on/off of around 8. When the CTAB molecules are extracted, so that the radicals can enter the mesopores, the enhancements increase to ε_on/off ≈ 30 for both nuclei. A quantitative analysis of the signal enhancements in MSN with and without surfactant is based on a one-dimensional proton spin diffusion model. The effect of solvent deuteration is also investigated

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