The Golden Age of Transfer Hydrogenation

Core–shell nanoparticles (CSNs) are a class of nanostructured materials that have recently received increased attention owing to their interesting properties and broad range of applications in catalysis, biology, materials chemistry and sensors. By rationally tuning the cores as well as the shells of such materials, a range of core–shell nanoparticles can be produced with tailorable properties that can play important roles in various catalytic processes and offer sustainable solutions to current energy problems. Various synthetic methods for preparing different classes of CSNs, including the Stober method, solvothermal method, one-pot synthetic method involving surfactants, etc., are briefly mentioned here. The roles of various classes of CSNs are exemplified for both catalytic and electrocatalytic applications, including oxidation, reduction, coupling reactions, etc.

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

Nanosized mesoporous silica particles with high colloidal stability attract growing attention as drug delivery systems for targeted cancer treatment and as bioimaging devices. This Perspective describes recent breakthroughs in mesoporous silica nanoparticle design to demonstrate their high potential as multifunctional drug delivery nanocarriers. These types of nanoparticles can feature a well-defined and tunable porosity at the nanometer scale, high loading capacity, and multiple functionality for targeting and entering different types of cells. We focus on the requirements for an efficient stimuli-responsive and thus controllable release of cargo into cancer cells and discuss design principles for smart and autonomous nanocarrier systems. Mesoporous silica nanoparticles are viewed as a promising and flexible platform for numerous biomedical applications.

Multifunctional Mesoporous Silica Nanoparticles as a Universal Platform for Drug Delivery

Recent advancements in drug delivery technologies utilizing a variety of carriers have resulted in a path-breaking revolution in the approach towards diagnosis and therapy alike in the current times. Need for materials with high thermal, chemical and mechanical properties have led to the development of mesoporous silica nanoparticles (MSNs). These ordered porous materials have garnered immense attention as drug carriers owing to their distinctive features over the others. They can be synthesized using a relatively simple process, thus making it cost effective. Moreover, by controlling the parameters during the synthesis; the morphology, pore size and volume and particle size can be transformed accordingly. Over the last few years, a rapid increase in research on MSNs as drug carriers for the treatment of various diseases has been observed indicating its potential benefits in drug delivery. Their widespread application for the loading of small molecules as well as macromolecules such as proteins, siRNA and so forth, has made it a versatile carrier. In the recent times, researchers have sorted to several modifications in the framework of MSNs to explore its potential in drug resistant chemotherapy, antimicrobial therapy. In this review, we have discussed the synthesis of these multitalented nanoparticles and the factors influencing the size and morphology of this wonder carrier. The second part of this review emphasizes on the applications and the advances made in the MSNs to broaden the spectrum of its use especially in the field of biomedicine. We have also touched upon the lacunae in the thorough understanding of its interaction with a biological system which poses a major hurdle in the passage of this carrier to the clinical level. In the final part of this review, we have discussed some of the major patents filed in the field of MSNs for therapeutic purpose.

https://www.mdpi.com/1999-4923/10/3/118/pdf/1

Mesoporous Silica Nanoparticles: A Comprehensive Review on Synthesis and Recent Advances

Porous nanosized particles: preparation, properties, and applications.

Regulation of Silver Nanoclusters with 4 Orders of Magnitude Variation of Fluorescence Lifetimes with Solvent-Induced Noncovalent Interaction

The invention discloses a preparation method of microporous zeolite molecular sieves with different topological structures. The method comprises the following steps: by using layered mesoporous phases with ordered pore wall molecules as precursors, carrying out oriented structure modification on pore walls by using a hydrophobic silanization agent with a special molecular structure under an acidic condition, and then carrying out high-temperature roasting so as to obtain the novel microporous zeolite molecular sieves with the different topological structures. The zeolite molecular sieves synthesized by using the method are stable in structures, and the hydrophilicity and hydrophobicity in pore passages can be effectively modulated on the molecular level. The layered mesoporous molecular sieves are used as the precursors for synthesizing the zeolite molecular sieves, so that the direct correlation of two fields of mesoporous and cellular materials is realized for the first time.

Preparation method of microporous zeolite molecular sieves with different topological structures

The invention discloses a preparation method for multilevel mesoporous silica nanoparticles According to the method, a long-chain ionic liquid surfactant is adopted as a template agent, organic small molecular amine is taken as an alkali source, tetraalkyl silicate ester is used as a silicon source, and deionized water is taken as a water source For the raw materials, the silicon source, the ionic liquid surfactant, the organic small molecular amine and water are in a mole ratio of 1:001-03:0001-80:40-1000 According to the invention, the particle size can be effectively regulated in a range of 20-200nm The synthesized mesoporous SiO2 nanospheres are uniform in size, have a specific surface area of 1000m /g, a pore volume of 20ml/g, and a pore diameter of 2-30nm, and have an obvious divergent pore channel structure from the inside out, ie a so-called multilevel mesoporous structure The synthesis method provided by the invention has the advantages of simplicity, easy scalization, short cycle, low cost and good repeatability, thus being an environmental friendly synthetic strategy

Preparation method for multilevel mesoporous silica nanoparticles

This
excellent story answered two unresolved questions in the past one century and
two centuries. The first one is that water is colored or noncolored (Water
as an Activator of Luminescence. Nature 1930, 125, 706-707)? If it is colorful,
why and how does it emit the bright colors? The second question is on the
physical origin of catalysis or catalyst, i.e., the mysterious internal force
of catalysis is what, and how this powerful force determines the chemical
reactivity, including activity, selectivity and life times (or stability of
catalyst)? (A Brief History of Catalysis. CATTECH 2003, 7 (4), 130-138.)

After reading this
interesting story, both seemingly non-related two questions could be perfectly
answered by topological excitation of singly hydrated hydroxide complex in
confined sub-nanospace.

/pdf/topological-excitation-of-singly-hydrated-hydroxide-complex-2m5fqn53p3.pdf

Topological Excitation of Singly Hydrated Hydroxide Complex in Confined Sub-Nanospace for Bright Color Emission and Heterogeneous Catalysis

Significant progresses have been made in the performance of homogeneous catalysts in the oligomerization of 1-decene to polyalphaolefin (PAO), whereas it remains a big challenge to design heterogeneous catalysts with high catalytic activity in the PAO synthesis. Herein, a series of heterogeneous mesoporous catalysts with different acidity were successfully synthesized by the in situ incorporation of Al in the channels of mesoporous silica under room temperature and atmospheric pressure. These samples were characterized by various techniques including XRD (X-ray diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), BET (N2 adsorption–desorption analyses), Py-IR (pyridine-adsorbed IR) and XPS (X-ray photoelectron spectroscopy). The obtained samples exhibit a high surface area, high ordering, and controllable Bronsted and Lewis acid sites. The results indicated that the increasing acidity promotes oligomer selectivity, especially for the trimer (C30). The resulting heterogeneous catalyst exhibited excellent performance with high conversion (70.7%) and high oligomer selectivity (96.7%) due to the suitable acid sites. Moreover, the spent heterogeneous catalyst could be regenerated and its catalytic activity maintained after five cycles.

Kun Zhang

Papers

Regulation of Silver Nanoclusters with 4 Orders of Magnitude Variation of Fluorescence Lifetimes with Solvent-Induced Noncovalent Interaction

Preparation method of microporous zeolite molecular sieves with different topological structures

Preparation method for multilevel mesoporous silica nanoparticles

Topological Excitation of Singly Hydrated Hydroxide Complex in Confined Sub-Nanospace for Bright Color Emission and Heterogeneous Catalysis

Precisely regulating the acidity of mesoporous silica on the catalytic performance of 1-decene oligomerization