Synthesis and Characterization of Mesoporous Silica Nanoparticles Loaded with Pt Catalysts

Lyu, Xingyi; Wu, Xun; Liu, Yuzi; Huang, Wenyu; Lee, Byeongdu; Li, Tao

doi:10.3390/catal12020183

Cited by 12 publications

(9 citation statements)

References 40 publications

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“…Figure shows representative small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) data for a mesoporous catalytic support with a pore diameter of 2.4 nm. The SAXS profile (Figure a) shows three peaks at positions 1, 3 , and 2 relative to its principal peak ( q *), indicating that the cylindrical pore channels shown in the TEM image (Figure b) are 2D hexagonally ordered. , The second order peak appears as a weak shoulder to the third peak, indicating the presence of a form factor minima …”

Section: Resultsmentioning

confidence: 97%

“…28,29 The second order peak appears as a weak shoulder to the third peak, indicating the presence of a form factor minima. 29 These strong diffraction peaks from the ordered nanochannels allow monitoring of the infiltration of polymers into the pore in situ, 30 which is demonstrated from simulated SAXS curves (Figure S1) with the analytical scattering formulae of a particle containing ordered pores (see the SI). In principle, the diffraction peak intensity is proportional to the product of the number of particles in the beam N p and the scattering contrast of the porous structure Δρ,…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The SAXS profile (Figure 1a) shows three peaks at positions 1, 3 , and 2 relative to its principal peak (q*), indicating that the cylindrical pore channels shown in the TEM image (Figure 1b) are 2D hexagonally ordered. 28,29 The second order peak appears as a weak shoulder to the third peak, indicating the presence of a form factor minima. 29 These strong diffraction peaks from the ordered nanochannels allow monitoring of the infiltration of polymers into the pore in situ, 30 which is demonstrated from simulated SAXS curves (Figure S1) with the analytical scattering formulae of a particle containing ordered pores (see the SI).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The above materials were used as received unless otherwise specified. The mSiO 2 /SiO 2 mesoporous nanoparticles with different pore diameters (1.7, 2.4, and 3.5 nm) and nonporous SiO 2 nanoparticles were synthesized as previously described. ,, The shell thicknesses (pore lengths) were ∼120 nm with minor variations.…”

Section: Methodsmentioning

confidence: 99%

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Molecular-Weight-Dependent Infiltration and Adsorption of Polymers into Nanochannels

Lyu

Meirow

et al. 2023

ACS Appl. Mater. Interfaces

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The mesoporous silica shell coating hydrogenolysis nano-catalysts alters the molecular weight distributions of cleaved polymer chains compared to catalysts without a shell. The shell, composed of radially aligned narrow cylindrical nanopores, reduces the formation of low-valued gaseous products and increases the median molecular weight of the product, thus enhancing the value of the products for polymer upcycling. To understand the role of the mesoporous shell, we have studied the spatial distribution of polystyrene chains, used as a model polymer, in the nanochannels in both the melt phase and solution phase. In the melt, we observed from small-angle X-ray scattering experiments that the infiltration rate of the polymer into the nanochannels is inversely proportional to the molecular weight, which is consistent with theory. In theta solution experiments using UV−vis spectroscopy, we found that the shell significantly enhances polymer adsorption compared to nanoparticles without pores. In addition, the degree of polymer adsorption is not a monotonic function of molecular weight but initially increases with the molecular weight before eventually decreasing. The molecular weight for the peak adsorption increases with the pore diameter. This adsorption behavior is rationalized as resulting from a balance between the mixing entropy gain by surface adsorption and the conformational entropy penalty incurred by chains confined in the nanochannels. The spatial distribution of polymer chains in the nanochannels is visualized by energy-dispersive X-ray spectroscopy (EDX), and inverse Abel-transformed data reveals a less uniform polymer distribution along the primary pore axis for longer chains.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Molecular-Weight-Dependent Infiltration and Adsorption of Polymers into Nanochannels

Lyu

Meirow

et al. 2023

ACS Appl. Mater. Interfaces

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“…For porosity and surface area analysis, the specific surface area of the sample was assessed by BET method and the pore size and pore volume distribution was determined by BJH method using the ASAP 2010 static volumetric absorption analyzer (Micromerities Corp., NY, USA). To remove residual moisture on the particles, samples were degassed by heating at 110 °C for 2 h before nitrogen treatment as the absorbent 37 .…”

Section: Methodsmentioning

confidence: 99%

Size-dependent bioactivity of electrosprayed core–shell chitosan-alginate particles for protein delivery

Shamszadeh

Akrami

Asgary

2022

Sci Rep

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Nano-bio interactions are size-dependent. The present study investigates whether core–shell chitosan-alginate particle size governs biological activities as well as protein release profile. A coaxial electrospraying was used to fabricate bovine serum albumin (BSA)-loaded core–shell micro/nanoparticles and were fully characterized. The bio/hemocompatibility of the particles was assessed using MTT and hemolytic assays, respectively, followed by the uptake assessment using flow cytometry. Finally, protein absorption was investigated using SDS-PAGE. The SEM size of the microparticles, the hydrodynamic, and the actual sizes of the nanoparticles were 1.2 μm, 90.49 nm, and 50 nm, respectively. Interactions among two polymers and BSA were observed using DSC analysis. BET analysis showed a more surface area for nanoparticles. A sustained release trend of BSA was observed after 14- and 10-day for microparticles and nanoparticles, respectively. Microparticles exhibited excellent hemocompatibility (< 5% hemolysis) and cell viability (at least > 70%) in all concentrations. However, acceptable hemolytic activity and cell viability were observed for nanoparticles in concentrations below 250 μg/mL. Furthermore, nanoparticles showed greater cellular uptake (~ 4 folds) and protein absorption (~ 1.61 folds) than microparticles. Overall, the developed core–shell chitosan-alginate particles in the micro/nanoscale can be promising candidates for biomedical application and regenerative medicine regarding their effects on above mentioned biological activities.

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Study on the property of mesoporous silica nanoparticles loaded with nisin for poly (lactic acid)‐based packaging film

Jiang

Zhu

et al. 2023

Polymer Composites

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Nisin was loaded in mesoporous silica nanoparticles (MSN) (0, 1, 2 and 3 wt%) and incorporated into poly (lactic acid) (PLA) matrix by casting method. The mechanical property, water vapor permeability, thermal property, and antimicrobial property of PLA nanocomposite films were measured. And the internal structure of the composite film was observed through the Scanning electron microscope. Meanwhile, the kinetic of nisin releasing from food simulated solution was investigated and the migration model was established. The result showed that mesoporous silica had an effect on the mechanical and thermal property of the composite films. Both water vapor transmission rate (WVP) and oxygen permeation rate (OTR) decreased, especially for 3MSN/NI/PLA, where WVP decreased by about 9.64% and OTR decreased by 35.19%, which was beneficial to improve the preservation effect. With the addition of MSN, the amount of loaded nisin increased, and at 3MSN/NI, the nisin loading reached 88.75%, and the mesoporous silica could effectively control the release of nisin, thus prolonging the preservation effect. The release kinetic of nisin was described by Fick's law and Weibull's model. In short, the PLA nanocomposite film has the potential to be used as an antimicrobial active film by adding nisin as an antimicrobial agent.Highlights A biodegradable antimicrobial food grade film was prepared. Nisin was added to the films as an antimicrobial agent. The ordered mesoporous structure of MSN was used as a carrier of antimicrobial agent. The film effectively inhibits E. coli and S. aureus by controlling the release of nisin. Fick's law and Weibull's model were used to describe the release kinetics of Nisin.

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Synthesis and Characterization of Mesoporous Silica Nanoparticles Loaded with Pt Catalysts

Cited by 12 publications

References 40 publications

Molecular-Weight-Dependent Infiltration and Adsorption of Polymers into Nanochannels

Molecular-Weight-Dependent Infiltration and Adsorption of Polymers into Nanochannels

Size-dependent bioactivity of electrosprayed core–shell chitosan-alginate particles for protein delivery

Study on the property of mesoporous silica nanoparticles loaded with nisin for poly (lactic acid)‐based packaging film

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