Controlling nanostructure in periodic mesoporous hexylene-bridged polysilsesquioxanes

Lin, Derong; Hu, Lijiang; Tolbert, Stephanie H.; Li, Zhe; Loy, Douglas A.

doi:10.1016/j.jnoncrysol.2015.03.010

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…This periodicity was later extended to meta ‐P ( m ‐P) and biphenylene (−C 6 H 4 −C 6 H 4 −) bridges . These studies inspired researchers from around the globe and led to a vast panel of PMO structures such hexylene (−CH 2 −CH 2 −CH 2 −CH 2 −CH 2 −CH 2 −), bipyridine (−C 5 H 3 N−C 5 H 3 N−), thiophene (−C 4 H 2 S−), and bithiophene (−C 4 H 2 S−C 4 H 2 S−) bridges, to name a few . Several bifunctional PMO were also designed by multiple silanes co‐condensation …”

Section: Introductionmentioning

confidence: 98%

“…[31,32] These studies inspired researchersf rom around the globe and led to av ast panel of PMO structures such hexylene (ÀCH 2 ÀCH 2 ÀCH 2 ÀCH 2 ÀCH 2 À CH 2 À), bipyridine (ÀC 5 H 3 NÀC 5 H 3 NÀ), thiophene (ÀC 4 H 2 SÀ), and bithiophene( ÀC 4 H 2 SÀC 4 H 2 SÀ)b ridges, to name af ew. [9,[33][34][35] Severalb ifunctional PMO were also designed by multiple silanes co-condensation. [36][37][38] NanoscaledP MOs [39] have been comparatively much less investigated due to the ongoing challenge to control the morphology, porositya nd organisationo fs ilsesquioxane materials.…”

Section: Introductionmentioning

confidence: 99%

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Periodic Mesoporous Organosilica Nanoparticles with Controlled Morphologies and High Drug/Dye Loadings for Multicargo Delivery in Cancer Cells

Croissant

Fatieiev

Omar

et al. 2016

Chemistry A European J

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Despite the worldwide interest generated by periodic mesoporous organosilica (PMO) bulk materials, the design of PMO nanomaterials with controlled morphology remains largely unexplored and their properties unknown. In this work, we describe the first study of PMO nanoparticles (NPs) based on meta-phenylene bridges, and we conducted a comparative structure-property relationship investigation with para-phenylene-bridged PMO NPs. Our findings indicate that the change of the isomer drastically affects the structure, morphology, size, porosity and thermal stability of PMO materials. We observed a much higher porosity and thermal stability of the para-based PMO which was likely due to a higher molecular periodicity. Additionally, the para isomer could generate multipodal NPs at very low stirring speed and upon this discovery we designed a phenylene-ethylene bridged PMO with a controlled Janus morphology. Unprecedentedly high payloads could be obtained from 40 to 110 wt % regardless of the organic bridge of PMOs. Finally, we demonstrate for the first time the co-delivery of two cargos by PMO NPs. Importantly, the cargo stability in PMOs did not require the capping of the pores, unlike pure silica, and the delivery could be autonomously triggered in cancer cells by acidic pH with nearly 70 % cell killing.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Periodic Mesoporous Organosilica Nanoparticles with Controlled Morphologies and High Drug/Dye Loadings for Multicargo Delivery in Cancer Cells

Croissant

Fatieiev

Omar

et al. 2016

Chemistry A European J

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“…The same xerogels prepared under basic conditions are mesoporous with surface areas as high as 600 m 2 /g hundreds of meters squared. One of the key advantages of surfactant templated bridged polysilsesquioxanes is that they can be made under acidic conditions with long, flexible bridging groups and still be porous, whereas the sol-gel processed ones are nonporous (Lin et al 2015). Pore size distributions for some alkylene-and arylenebridged xerogels are as narrow as many surfactant template systems (Fig.…”

Section: Properties Of Mesoporous Polysilsesquioxanesmentioning

confidence: 99%

Mesoporous Polysilsesquioxanes: Preparation, Properties, and Applications

Loy¹

2016

Handbook of Sol-Gel Science and Technology

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Mesoporous polysilsesquioxanes are an important class of hybrid organicinorganic materials with numerous applications in microelectronics, membranes, chromatographic materials, catalysis, and more. Prepared by sol-gel polymerization of monomers with trialkoxysilyl groups, these materials are based on siloxane networks modified by organic groups. Mesoporosity in these materials is formed through sol-gel polymerizations by themselves or can be directed into ordered arrays using surfactant templating. Surfactant templating allows mesopores in geometries ranging from cylindrical pores to gyroid porosities. Surfactant templating also enables the facile development of hierarchical structures where multiple modes of pores can independently coexist in the same material. Formulations for preparation of all of these mesoporous materials as monoliths, particles, and coatings will be discussed and examples will be provided.

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“…Adsorption has become one of the methods of wastewater treatment. Among these, the bridge group and modified silsesquioxane (SSO) have used a variety of optimization methods to promote the development and application of this mesoporous three-dimensional material because of its unique physical and chemical properties [1,2,3,4,5,6,7,8]. For example, the SSO membrane can be used for the removal of anionic compounds, and it can be easily separated from the treated medium [9].…”

Section: Introductionmentioning

confidence: 99%

“…Hexane, octane, phenyl, and biphenyl-bridged bis (triethoxysilyl) precursors can be used in synthesizing cubic mesoporous (BPS) copolymers. The textural properties of ordered mesoporous hexane bridged polysilsesquioxane (BPS) can be tailored by choosing reaction conditions [2]. And three-dimensional cubic (Pm3n) periodic mesoporous silsequioxanes (PMS) with alkylene bridging groups was prepared by surfactant templating.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Highly Ordered Mercapto-Modified Bridged Silsesquioxane for Removing Ammonia-Nitrogen from Water

et al. 2018

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In acidic conditions, mesoporous molecular sieves SBA-15 and SBA-15-SH were synthesized. Structural characterization was carried out by powder X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), 13C CP MAS-NMR, 29Si CP MAS-NMR and nitrogen adsorption–desorption (BET). The results showed that in SBA-15-SH, the direct synthesis method made the absorption peak intensity weaker than that of SBA-15, while the post-grafted peak intensity did not change. Their spectra were different due to the C-H stretching bands of Si-O-Si and propyl groups. But their structure was still evenly distributed and was still hexangular mesoporous structure. Their pore size increased, and the H-SBA-15-SH had larger pore size. The adsorption of ammonia-nitrogen by molecular sieve was affected by the relative pressure and the concentration of ammonia-nitrogen, in which the adsorption capacity of G-SBA-15-SH was the largest and the adsorption capacity of SBA-15 was the smallest.

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Controlling nanostructure in periodic mesoporous hexylene-bridged polysilsesquioxanes

Cited by 11 publications

References 34 publications

Periodic Mesoporous Organosilica Nanoparticles with Controlled Morphologies and High Drug/Dye Loadings for Multicargo Delivery in Cancer Cells

Periodic Mesoporous Organosilica Nanoparticles with Controlled Morphologies and High Drug/Dye Loadings for Multicargo Delivery in Cancer Cells

Mesoporous Polysilsesquioxanes: Preparation, Properties, and Applications

Preparation and Characterization of Highly Ordered Mercapto-Modified Bridged Silsesquioxane for Removing Ammonia-Nitrogen from Water

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