The Influence of Arylene and Alkylene Units on the Structuring of Urea‐Based Bridged Silsesquioxanes

Pichon, Benoît P.; Scampini, Sylvana; Bied, Catherine; Moreau, Joël J. E.; Man, Michel Wong Chi

doi:10.1002/ejic.201200616

Cited by 16 publications

(9 citation statements)

References 56 publications

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“…Such systems include disulfide‐ and tetrasulfide‐doped PMO NPs (for glutathione‐mediated biodegradation in cells), and degradable oxamide‐ or lysine‐doped PMO NPs. Fourth, solid nonporous BS NPs can also be constructed from bridged multi‐organoalkoxysilanes (Figure D) . The absence of specific interactions between micelles and bridged organoalkoxysilanes produces dense NPs with high organic content in the composite matrix …”

Section: Two‐photon‐sensitive Organosilica Nanomaterialsmentioning

confidence: 99%

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

Croissant

Zink

Raehm

et al. 2018

Adv Healthcare Materials

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Coherent two-photon-excited (TPE) therapy in the near-infrared (NIR) provides safer cancer treatments than current therapies lacking spatial and temporal selectivities because it is characterized by a 3D spatial resolution of 1 µm and very low scattering. In this review, the principle of TPE and its significance in combination with organosilica nanoparticles (NPs) are introduced and then studies involving the design of pioneering TPE-NIR organosilica nanomaterials are discussed for bioimaging, drug delivery, and photodynamic therapy. Organosilica nanoparticles and their rich and well-established chemistry, tunable composition, porosity, size, and morphology provide ideal platforms for minimal side-effect therapies via TPE-NIR. Mesoporous silica and organosilica nanoparticles endowed with high surface areas can be functionalized to carry hydrophobic and biologically unstable two-photon absorbers for drug delivery and diagnosis. Currently, most light-actuated clinical therapeutic applications with NPs involve photodynamic therapy by singlet oxygen generation, but low photosensitizing efficiencies, tumor resistance, and lack of spatial resolution limit their applicability. On the contrary, higher photosensitizing yields, versatile therapies, and a unique spatial resolution are available with engineered two-photon-sensitive organosilica particles that selectively impact tumors while healthy tissues remain untouched. Patients suffering pathologies such as retinoblastoma, breast, and skin cancers will greatly benefit from TPE-NIR ultrasensitive diagnosis and therapy.

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Section: Two‐photon‐sensitive Organosilica Nanomaterialsmentioning

confidence: 99%

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

Croissant

Zink

Raehm

et al. 2018

Adv Healthcare Materials

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“…50,51 Bromoundecene (Alpha Aesar) was rst mixed with triethoxysilane and Karstedt catalyst both purchased from ABCR to obtain bromoundecyl-triethoxysilane. 50,51 Bromoundecene (Alpha Aesar) was rst mixed with triethoxysilane and Karstedt catalyst both purchased from ABCR to obtain bromoundecyl-triethoxysilane.…”

Section: Synthesis Of Amino-undecyl-triethoxysilanementioning

confidence: 99%

Organosilica-metallic sandwich materials as precursors for palladium and platinum nanoparticle synthesis

et al. 2015

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A promising strategy to design highly active catalysts is to use multicomponent catalysts including active metals (such as platinoids) and organosilica as a substrate. In this article, we develop stable OrganoSilica Sandwiches (OSS) consisting of sandwiched metallic layers between organosilica layers. The formation of such a sandwich-like organosilica@platinoid@organosilica material was obtained from bis-silicaalkylammonium carbamate dimers, acting as a template for the immobilization of platinoid salt complexes or metallic nanoparticles in the interlayer space after a reduction treatment. The layered templates and the sandwich structures were investigated by small angle X-ray scattering, coupled thermogravimetric analysis and mass spectrometry, and Raman spectroscopy. It was demonstrated that the meso-structure of the initial template material is not affected by the chemical steps involved in the synthesis of the material and does not depend on the incorporated metal. † Electronic supplementary information (ESI) available: Fig. S1: in situ SAXS experiment of M1 and M1-Pt(IV) materials at 25 C and 120 C; Fig. S2: SAXS patterns of M1-Pd(0) and M1-Pt(0) in the range of 25 nm À1 to 31 nm À1 and the corresponding ts of structure peak; Fig. S3: TEM images of M1-Pt(0) material. See

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“…Other diureido derivatives including aryl groups91 to provide additional aromatic π–π stacking interactions ( 10 , Figure 14) or diaminocyclohexane92 to introduce chirality effects ( 11 , Figure 14) turned out to be effective building blocks for the synthesis of highly ordered self‐organized hybrid solids. The authors also focused on the influence of the experimental conditions,93 the alkylene chain length,94 and arylene structure95 on the mesostructuration process. They showed that pH affects not only hydrolysis/polycondensation kinetics, but also hydrogen‐bonding‐driven structuration when pH‐sensitive functions, such as carbamate groups, are involved.…”

Section: Self‐assembly Of Bis‐silylated Organosilanesmentioning

confidence: 99%

Ordered Hybrids from Template‐Free Organosilane Self‐Assembly

Chemtob

Croutxé‐Barghorn

et al. 2014

Chemistry A European J

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Despite considerable achievements over the last two decades, nonporous organic-inorganic hybrid materials are mostly amorphous, especially in the absence of solvothermal processes. The organosilane self-assembly approach is one of the few opportunities for creating a regular assembly of organic and inorganic moieties. Additionally, well-established organosilicon chemistry enables the introduction of numerous organic functionalities. The synthesis of periodically ordered hybrids relies on mono-, bis-, or multisilylated organosilane building blocks self-assembling into hybrid mesostructures or superstructures, subsequently cross-linked by siloxane Si-O-Si condensation. The general synthesis procedure is template-free and one-step. However, three concurrent processes underlie the generation of self-organized hybrid networks: thermodynamics of amphiphilic aggregation, dynamic self-assembly, and kinetically controlled sol-gel chemistry. Hence, the set of experimental conditions and the precursor structure are of paramount importance in achieving long-range order. Since the first developments in the mid-1990s, the subject has seen considerable progress leading to many innovative advanced nanomaterials providing promising applications in membranes, pollutant remediation, catalysis, conductive coatings, and optoelectronics. This work reviews, comprehensively, the primary evolution of this expanding field of research.

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The Influence of Arylene and Alkylene Units on the Structuring of Urea‐Based Bridged Silsesquioxanes

Cited by 16 publications

References 56 publications

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

Two‐Photon‐Excited Silica and Organosilica Nanoparticles for Spatiotemporal Cancer Treatment

Organosilica-metallic sandwich materials as precursors for palladium and platinum nanoparticle synthesis

Ordered Hybrids from Template‐Free Organosilane Self‐Assembly

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