Intermediate pickering emulsion formation as a means for synthesizing hollow mesoporous silica nanoparticles

Pochert, Alexander; Ziller, Sebastian; Kapetanovic, Sasa; Neusser, Gregor; Kranz, Christine; Lindén, Mika

doi:10.1039/c5nj02855h

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…Summarized in a phase diagram, it can observed that dimicellization occurs upon the introduction of (3-mercaptopropyl)trimethoxylsilane (MPTMS) resulting in a phase shift from cylindrical pores to vesicular phase. Other MSN syntheses that select TMB as the oil phase template for hollow MSNs have noticeably seen the effect of adsorption onto the template micelles and its effect on the MSN structure [186]. Similar results can be seen where high concentrations of CTAB convert hollow MSNs to solid silica nanoparticles with the collapse of the micelle oil phase [187].…”

Section: Hard and Soft Templating Synthesessupporting

confidence: 70%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

131

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A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

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Section: Hard and Soft Templating Synthesessupporting

confidence: 70%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

131

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“…A range of hollow mesostructured materials or hollow mesostructured organic–inorganic hybrid materials, which were synthesized via a diverse synthesis method, regardless of whether they were prepared by hard‐templating or soft‐templating or any other methodologies, have also been studied extensively . This article provides typical examples of the recent synthesis of hollow mesostructured hybrid materials based mainly on the authors' works.…”

Section: Preparation and Characterization Of Hollow Mesostructured Hymentioning

confidence: 99%

Hollow Mesoporous Functional Hybrid Materials: Fascinating Platforms for Advanced Applications

Park¹,

Ha²

2017

Adv Funct Materials

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Functionalized hollow nano-and microspheres containing both hollow and mesoporous structures are fascinating materials for a broad range of applications, such as nanoparticle collectors, catalysis, drug delivery systems, immobilization of biomolecules, and the adsorption and separation of gas and pollutants, because of their empty interior. These hollow mesoporous silica materials are synthesized mainly via soft-and hard-templating routes and are usually modified with a range of organic functional groups (SH, NH 2 , CN, CH 3 , CC, benzene, fluorine linked organoalkylsilanes, and ethane-, amine, benzene, and biphenyl-bridged silanes) to improve their performance in many applications. This article outlines the most advanced applications of silica-based and functionalized hollow mesoporous materials that are reported in the last 3 years (January 2014-June 2017). The high applicability of hollow materials in various fields is discussed, including drug delivery and cancer therapy, bioimaging, adsorption/separation, catalysis, thermal and electrical insulators, anticorrosion, sensors, fuel cells, proton conductors, membrane, optics, superhydrophobic surfaces, and fire safety.

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“…Emulsions are one of the important classes of multiphase materials. − Usually, they are considered thermodynamically unstable because of their high inner interfacial area and can be stabilized only kinetically, for example, using particles. − However, this general view is challenged by numerous observations on spontaneous emulsification. − These observations hold a promise for thermodynamically stable emulsions.…”

Section: Introductionmentioning

confidence: 99%

On the Negative Surface Tension of Solutions and on Spontaneous Emulsification

Kaptay

2017

Langmuir

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The condition of negative surface tension of a binary regular solution is discussed in this paper using the recently reconfirmed Butler equation (Langmuir 2015, 31, 5796-5804). It is shown that the surface tension becomes negative only for solutions with strong repulsion between the components. This repulsion for negative surface tension should be so strong that this phenomenon appears only within a miscibility gap, that is, in a two-phase region of macroscopic liquid solutions. Thus, for a macroscopic solution, the negative surface tension is possible only in a nonequilibrium state. However, for a nano-solution, negative surface tension is also possible in equilibrium state. It is also shown that nano- and microemulsions can be thermodynamically stable against both coalescence and phase separation. Further, the thermodynamic theory of emulsion stability is developed for a three-component (A-B-C) system with A-rich droplets dispersed in a C-rich matrix, separated by the segregated B-rich layer (the solubility of B is limited in both A and C while the mutual solubility of A and C is neglected). It is shown that when a critical droplet size is achieved by forced emulsification, it is replaced by spontaneous emulsification and the droplet size is reduced further to its equilibrium value. The existence of maximum temperature of emulsion stability is shown. Using low-energy emulsification below this maximum temperature, spontaneous emulsification can appear, which is enhanced with further decrease of temperature. This finding can be applied to interpret the experimental observations on spontaneous emulsification or for the design of stable micro- and nanoemulsions.

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Intermediate pickering emulsion formation as a means for synthesizing hollow mesoporous silica nanoparticles

Abstract: Particle and surfactant-stabilized emulsion droplets formed in situ serve as templates for hollow silica nanoparticle growth.

Cited by 11 publications

References 29 publications

Template-based syntheses for shape controlled nanostructures

Template-based syntheses for shape controlled nanostructures

Hollow Mesoporous Functional Hybrid Materials: Fascinating Platforms for Advanced Applications

On the Negative Surface Tension of Solutions and on Spontaneous Emulsification

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