Twisted and tubular silica structures by anionic surfactant fibers encapsulation

GoldHelix: Gold Nanoparticles Forming 3D Helical Superstructures with Controlled Morphology and Strong Chiroptical Property

“…In this context, the use of colloidal inorganic chiral nanostructures (for example twisted or helical nanoribbons with controlled lengths) as templates to organize the GNPs is described to form a sustainable alternative for new chiroptical materials with interesting optical properties such as giant optical activity or circular dichroism. [51][52] We have previously reported the synthesis of silica nanohelices, [53][54] [56][57][58] The resulting organic nanohelices were used as templates for the sol-gel condensation of a tetra alkoxysilane to obtain silica nanohelices (See scheme 1 for a depiction of the stepwise approach to obtain GNP-decorated functionalized inorganic nanohelices, i.e. the Goldhelices).…”

“…Such biomolecules also suffer from structure modification when concentrated, leading to a strong limitation for the construction of a large-scale hierarchical 2D or 3D superstructures, which are potentially very interesting since such superstructures can enhance the chiroptical properties of the individual building blocks in specific directions. , Robust alternatives to 3D anisotropic organic scaffolds to organize NPs are therefore desirable in order to fulfill nanophotonic materials design. In this context, the use of colloidal inorganic chiral nanostructures (for example twisted or helical nanoribbons with controlled lengths) as templates to organize the GNPs is described to form a sustainable alternative for chiroptical materials with interesting optical properties such as giant optical activity or CD. , …”

“…In this context, the use of colloidal inorganic chiral nanostructures (for example twisted or helical nanoribbons with controlled lengths) as templates to organize the GNPs is described to form a sustainable alternative for chiroptical materials with interesting optical properties such as giant optical activity or CD. 51,52 We have previously reported the synthesis of silica nanohelices, 53,54 using cationic bis-quaternary ammonium gemini surfactants 55 of chemical formula C 2 H 4 -1,2-((CH 3 ) 2 N + C 16 H 33 ) 2 , noted hereafter 16-2-16, which selfassemble to form nanometric helical structures with wellcontrolled dimensions in the presence of tartrate counterions, (helical pitch, diameter, and length). 56−58 The resulting organic nanohelices were used as templates for the sol−gel condensation of a tetra alkoxysilane to obtain silica nanohelices (see Scheme 1 for a depiction of the stepwise approach to obtain GNP-decorated functionalized inorganic nanohelices, i.e., the Goldhelices).…”

Direct Observation of Siloxane Chirality on Twisted and Helical Nanometric Amorphous Silica

“…Sol–gel transcription to silica materials, using these nanometric self-assemblies as chiral templates, offers them polymorphisms with further structural stability. , Chiral mesoporous silica having helical holes (several nanometers) were studied using X-ray diffraction and diffractograms by Che et al , Helical mesoporous silica can be used as effective templates for various attractive inorganic nanomaterials. Sanchez et al reported helical mesoporous organosilica fibers functionalized with fluorophore and chromophore for sensor and catalytic applications .…”

“…N anometric chiral objects based on molecular assembly such as twisted or helical nanoribbons represent a new class of objects having important potential in a large panel of applications, taking advantage for example of (1) electromechanical or optical chirality, 1−3 (2) local chiral environment for catalysis, 4−6 and (3) chiral recognition 7,8 as described in recent reviews by Wang et al 9 or Zhang et al 10 Sol−gel transcription to silica materials, using these nanometric self-assemblies as chiral templates, offers them polymorphisms with further structural stability. 11,12 Chiral mesoporous silica having helical holes (several nanometers) were studied using X-ray diffraction and diffractograms by Che et al 13,14 Helical mesoporous silica can be used as effective templates for various attractive inorganic nanomaterials. Sanchez et al reported helical mesoporous organosilica fibers functionalized with fluorophore and chromophore for sensor and catalytic applications.…”