Template‐free Preparation of Mesoporous Silica Spheres through Optimized Microfluidics

Chokkalingam, Venkatachalam; Weidenhof, Boris; Kramer, Michael D.; Herminghaus, Stephan; Seemann, Ralf; Maier, Wilhelm F.

doi:10.1002/cphc.201000188

Cited by 20 publications

(19 citation statements)

References 44 publications

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“…Several designs have been used to bring droplets together. [119][120][121][122][123][124][125][126][127] To subsequently overcome the stabilizing forces, both the viscosity ratio of two-phase fluids, 74 and the presence of surfactant at the interface [128][129][130] have to be considered.…”

Section: Droplet Mergingmentioning

confidence: 99%

“…The conditions under which droplet merging occurs, can be predicted on the basis of their model. Alternatively in other channel geometries, droplets are merged by slowing down or stopping the leading droplet at a simple geometrical constriction, [126][127] or in a channel with an array of pillar elements. [123][124] It should be noted that typically no surfactant is used in these passive merging experiments.…”

Section: Passive Mergingmentioning

confidence: 99%

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Surface quality of aluminium extrusion products

Gu¹

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Section: Droplet Mergingmentioning

confidence: 99%

Section: Passive Mergingmentioning

confidence: 99%

Surface quality of aluminium extrusion products

Gu¹

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“…The SBA-N2E (Fig. 7e) present two morphology types: particle clusters and microspheres [28,[39][40][41]; the SBA-N3E (Fig. 7f) also shows particles accumulation.…”

Section: Contributed Articlementioning

confidence: 99%

Physicochemical effects of amino‐ or sulfur‐functional groups onto SBA‐15 sol‐gel synthesized mesoporous ceramic material

Vargas-Osorio

Chanes-Cuevas

Pérez-Soria

et al. 2016

Phys. Status Solidi C

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SBA‐15 mesoporous ceramics were synthesized by a sol‐gel method with some modifications and functionalized with ethylenediamine or tetrasulfide groups and using a sequential washing approach of organic solvent mixtures. The effects of the functional groups onto the physicochemical properties were characterized using XRD, TG/DTA, FTIR, N2 adsorption–desorption, TEM, SEM and NMR. These analyses showed that the SBA‐15 ceramic synthesized at low temperature shows a flat two‐dimensional hexagonal symmetry with pore diameters of 7.1 to 7.8 nm. In the meantime, the functionalized ethylenediamine SBA‐15 presented a narrow pore‐size distribution with diameter around 3.5 to 5.7 nm. A different behavior was observed on the tetrasulfide SBA‐15 showing a decrease in unit‐cell parameter, in pore size (∼ 2.5 nm) and an increase in pore wall size with loss in structural order and at high sulfur concentrations exhibited an amorphous structure. Results indicated that the lattice crystalline structure value of the SBA‐15 increased due to the amino‐functionalization process to a value of 13.48 nm respect to a value of 12.72 nm in SBA‐15 and decreased to 10.12 nm as an effect of the sulfur‐functionalization process, indicative of the effect of the amino and sulfur group into the well‐ordered hexagonal mesoporous structure of SBA‐15 ceramic materials.

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“…The coalescence of neighboring droplets can be largely suppressed by suitable surfactant molecules [3] or even by macroscopic particles that adsorb to the liquid-liquid interface [4]. This astonishing stability against coalescence allows one to employ, for example, individual emulsion droplets as tiny mobile containers for living cells in microbiological applications [5,6] or as chemical reactors on the micrometer scale [7]. Manipulations of flowing droplets, such as the merging of two adjacent droplets triggered by an electric pulse [8] or active sorting into different channels [9], open a large range of applications.…”

Section: Introductionmentioning

confidence: 98%

Packings of monodisperse emulsions in flat microfluidic channels

2012

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In the lateral confinement of a flat microfluidic channel, monodisperse emulsion droplets spontaneously self-organize in a variety of topologically different packings. The explicit construction of mechanically equilibrated arrangements of effectively two-dimensional congruent droplet shapes reveals the existence of multiple mechanical equilibria depending on channel width W, droplet area A{d}, and volume fraction φ of the dispersed phase. The corresponding boundaries of local or global stability are summarized in a packing diagram for congruent droplet shapes in terms of the dimensionless channel width w=W/sqrt[A_{d}] and φ. In agreement with experimental results, an increasingly strong hysteresis of the transition between single-row and two-row packings is observed during changes of w above a threshold volume fraction of φ≃0.813.

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Template‐free Preparation of Mesoporous Silica Spheres through Optimized Microfluidics

Cited by 20 publications

References 44 publications

Surface quality of aluminium extrusion products

Surface quality of aluminium extrusion products

Physicochemical effects of amino‐ or sulfur‐functional groups onto SBA‐15 sol‐gel synthesized mesoporous ceramic material

Packings of monodisperse emulsions in flat microfluidic channels

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