16 research outputs found
Syntheses and applications of periodic mesoporous organosilica nanoparticles
International audienc
Photoresponsive Bridged Silsesquioxane Nanoparticles with Tunable Morphology for Light-Triggered Plasmid DNA Delivery
Bridged silsesquioxane nanocomposites
with tunable morphologies
incorporating <i>o</i>-nitrophenylene–ammonium bridges
are described. The systematic screening of the sol–gel parameters
allowed the material to reach the nanoscale with controlled dense
and hollow structures of 100–200 nm. The hybrid composition
of silsesquioxanes with 50% organic content homogeneously distributed
in the nanomaterials endowed them with photoresponsive properties.
Light irradiation was performed to reverse the surface charge of nanoparticles
from +46 to −39 mV via a photoreaction of the organic fragments
within the particles, as confirmed by spectroscopic monitorings. Furthermore,
such nanoparticles were applied for the first time for the on-demand
delivery of plasmid DNA in HeLa cancer cells via light actuation
Photoresponsive Bridged Silsesquioxane Nanoparticles with Tunable Morphology for Light-Triggered Plasmid DNA Delivery
Bridged silsesquioxane nanocomposites
with tunable morphologies
incorporating <i>o</i>-nitrophenylene–ammonium bridges
are described. The systematic screening of the sol–gel parameters
allowed the material to reach the nanoscale with controlled dense
and hollow structures of 100–200 nm. The hybrid composition
of silsesquioxanes with 50% organic content homogeneously distributed
in the nanomaterials endowed them with photoresponsive properties.
Light irradiation was performed to reverse the surface charge of nanoparticles
from +46 to −39 mV via a photoreaction of the organic fragments
within the particles, as confirmed by spectroscopic monitorings. Furthermore,
such nanoparticles were applied for the first time for the on-demand
delivery of plasmid DNA in HeLa cancer cells via light actuation
Multifunctional Gold-Mesoporous Silica Nanocomposites for Enhanced Two-Photon Imaging and Therapy of Cancer Cells
International audienceThree dimensional sub-micron resolution has made two-photon nanomedicine a very promising medical tool for cancer treatment since current techniques cause significant side effects for lack of spatial selectivity. Two-photon-excited (TPE) photodynamic therapy (PDT) has been achieved via mesoporous nanoscaffolds, but the efficiency of the treatment could still be improved. Herein, we demonstrate the enhancement of the treatment efficiency via gold-mesoporous organosilica nanocomposites for TPE-PDT in cancer cells when compared to mesoporous organosilica particles. We performed the first comparative study of the influence of the shape and spatial position of gold nanoparticles (AuNPs) with mesoporous silica nanoparticles (MSN) functionalized with thiol groups and doped with a two-photon electron donor (2PS). The resulting multifunctional nanocarriers displayed TPE-fluorescence and were imaged inside cells. Furthermore, mesoporous organosilica NPs decorated gold nanospheres (AuNSs) induced 63 percent of selective killing on MCF-7 breast cancer cells. This study thus provides insights for the design of more effective multifunctional two-photon-sensitive nanocomposites via AuNPs for biomedical applications
Engineering Hydrophobic Organosilica Nanoparticle-Doped Nanofibers for Enhanced and Fouling Resistant Membrane Distillation
Engineering and scaling-up new materials
for better water desalination
are imperative to find alternative fresh water sources to meet future
demands. Herein, the fabrication of hydrophobic polyÂ(ether imide)
composite nanofiber membranes doped with novel ethylene-pentafluorophenylene-based
periodic mesoporous organosilica nanoparticles is reported for enhanced
and fouling resistant membrane distillation. Novel organosilica nanoparticles
were homogeneously incorporated into electrospun nanofiber membranes
depicting a proportional increase of hydrophobicity to the particle
contents. Direct contact membrane distillation experiments on the
organosilica-doped membrane with only 5% doping showed an increase
of flux of 140% compared to commercial membranes. The high porosity
of organosilica nanoparticles was further utilized to load the eugenol
antimicrobial agent which produced a dramatic enhancement of the antibiofouling
properties of the membrane of 70% after 24 h
Synthesis of disulfide-based biodegradable bridged silsesquioxane nanoparticles for twophoton imaging and therapy of cancer cells
International audienc