In the past decade, mesoporous silica nanoparticles (MSNs) have attracted more and more attention for their potential biomedical applications. With their tailored mesoporous structure and high surface area, MSNs as drug delivery systems (DDSs) show significant advantages over traditional drug nanocarriers. In this review, we overview the recent progress in the synthesis of MSNs for drug delivery applications. First, we provide an overview of synthesis strategies for fabricating ordered MSNs and hollow/rattle-type MSNs. Then, the in vitro and in vivo biocompatibility and biotranslocation of MSNs are discussed in relation to their chemophysical properties including particle size, surface properties, shape, and structure. The review also highlights the significant achievements in drug delivery using mesoporous silica nanoparticles and their multifunctional counterparts as drug carriers. In particular, the biological barriers for nano-based targeted cancer therapy and MSN-based targeting strategies are discussed. We conclude with our personal perspectives on the directions in which future work in this field might be focused.

Mesoporous Silica Nanoparticles: Synthesis, Biocompatibility and Drug Delivery

Drug delivery, magnetic resonance and fluorescence imaging, magnetic manipulation, and cell targeting are simultaneously possible using a multifunctional mesoporous silica nanoparticle. Superparamagnetic iron oxide nanocrystals were encapsulated inside mesostructured silica spheres that were labeled with fluorescent dye molecules and coated with hydrophilic groups to prevent aggregation. Water-insoluble anticancer drugs were delivered into human cancer cells; surface conjugation with cancer-specific targeting agents increased the uptake into cancer cells relative to that in non-cancerous fibroblasts. The highly versatile multifunctional nanoparticles could potentially be used for simultaneous imaging and therapeutic applications.

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Multifunctional Inorganic Nanoparticles for Imaging, Targeting, and Drug Delivery

This tutorial review provides an outlook on nanomaterials that are currently being used for theranostic purposes, with a special focus on mesoporous silica nanoparticle (MSNP) based materials. MSNPs with large surface area and pore volume can serve as efficient carriers for various therapeutic agents. The functionalization of MSNPs with molecular, supramolecular or polymer moieties, provides the material with great versatility while performing drug delivery tasks, which makes the delivery process highly controllable. This emerging area at the interface of chemistry and the life sciences offers a broad palette of opportunities for researchers with interests ranging from sol–gel science, the fabrication of nanomaterials, supramolecular chemistry, controllable drug delivery and targeted theranostics in biology and medicine.

Mesoporous silica nanoparticles in biomedical applications

Drug delivery, magnetic resonance andfluorescence imaging, magnetic manipulation, and cell targetingaresimultaneouslypossibleusingamultifunctionalmesoporoussilicananoparticleSuperparamagnetic ironoxidenanocrystalswereencapsulatedinsidemesostructuredsilicaspheresthatwerelabeledwithfluorescent dye molecules and coated with hydrophilic groups to prevent aggregation Water-insoluble anticancer drugs were delivered into human cancer cells; surface conjugation with cancer-specific targeting agents increased the uptake into cancer cells relative to that in non-cancerousfibroblasts The highly versatile multifunctional nanoparticles could potentially be used for simultaneous imaging and therapeutic applications

/pdf/multifunctional-inorganic-nanoparticles-for-imaging-3c6uigzz0u.pdf

Multifunctional Inorganic Nanoparticles for Imaging, Targeting, and Drug

Good control of the morphology, particle size, uniformity and dispersity of mesoporous silica nanoparticles (MSNs) is of increasing importance to their use in catalyst, adsorption, polymer filler, optical devices, bio-imaging, drug delivery, and biomedical applications. This review discusses different synthesis methodologies to prepare well-dispersed MSNs and hollow silica nanoparticles (HSNs) with tunable dimensions ranging from a few to hundreds of nanometers of different mesostructures. The methods include fast self-assembly, soft and hard templating, a modified Stober method, dissolving–reconstruction and modified aerogel approaches. In practical applications, the MSNs prepared by these methods demonstrate good potential for use in high-performance catalysis, antireflection coating, transparent polymer–MSNs nanocomposites, drug-release and theranostic systems.

Synthesis of mesoporous silica nanoparticles

MCM-41 silica particles with several morphologies have been controllably synthesized with a basic medium. Nanospherical MCM-41 silica with an average size of 110 nm was produced through reaction of extremely low surfactant concentrations of CTAB with TEOS in the sodium hydroxide medium at 353 K, while a submicrometer-sized silica rod, 0.3−0.6 μm in diameter and 1 μm in length, and micrometer-sized oblate silica with nominal diameter around 1 μm were synthesized in aqueous ammonia, where the size and the morphology were controlled by varing the content of the solvent. A morphogenetic mechanism that is based on the deposition of self-assembled silicate surfactant rodlike micelles is proposed and explains well the controllability of the morphology.

Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium

Synthesis and structure of the [AlPO4]12 Pr4NF molecular sieve with AFI structure

New mineralization agents for the synthesis of MCM-41

Synthesis of mordenite single crystals using two silica sources

The influence of the synthesis conditions on the crystallization and
crystal size of AlPO
 4
-5 molecular sieve is investigated in a
(TEA)
 2
O–Al
 2
O
 3
–P
 2

O
 5
–H
 2
O system. The initial mixture composition
and the crystallization method affect the crystallization and the crystal
size of the product. Microwave heating of the synthesis mixture results in
the formation of AlPO
 4
-5 with nanometre-sized
particles.

Wenqin Pang

Papers

Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium

Synthesis and structure of the [AlPO4]12 Pr4NF molecular sieve with AFI structure

New mineralization agents for the synthesis of MCM-41

Synthesis of mordenite single crystals using two silica sources

Preparation by microwave irradiation of nanometre-sized AlPO4-5 molecular sieve