Tubular catalytic polyHIPE reactor with deposited silver nanoplate nanoparticles

Mravljak, Rok; Božič, Benjamin; Podlogar, Matejka; Podgornik, Aleš

doi:10.1016/j.cej.2022.137869

Cited by 4 publications

(11 citation statements)

References 107 publications

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“…While trisodium citrate has long been considered essential for silver nanoplate formation, it was later demonstrated that it can be substituted by other carboxylic acids. 64 During our preliminary investigation, we found that silver nanoplates can be produced even in the complete absence of trisodium citrate or other carboxylic acid 31 and can already be obtained with only four reagents, namely, AgNO 3 , NaBH 4 , H 2 O 2 , and PVP. During further method development and optimization, the role of each component was carefully examined and optimized accordingly, also considering preparation in larger volumes and higher concentrations.…”

Section: Resultsmentioning

confidence: 97%

“…Once initial AgNP synthesis was optimized, we investigated AgNP transformation into silver nanoplates with a subsequent addition of hydrogen peroxide, keeping PVP/Ag + ratio constant at 6.6. The ratio was chosen as an in-between value based on reports suggesting high ratio of 17.1 31 and a low ratio of 0.89 and 0.22. 15 H 2 O 2 plays an essential role in nanoplate synthesis providing through its reaction energy for transformation of previously formed AgNP.…”

Section: Resultsmentioning

confidence: 99%

“…A rather high PVP M /Ag + ratio of 110 was originally used, 57 which affects the solution viscosity 81 and increases centrifugation time and, more importantly, PVP consumption. This ratio was already decreased recently; 31 therefore, we investigated what can be the lowest ratio to obtain suitable nanoplates. In Figure 3 c, colloids prepared with lower ratios resulted in a reduced transformation rate, and, even with an inflection point, not observed for higher ratios.…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis was developed by modifying previously published procedures. ,, The typical synthesis proceeded by first preparing 18 mL of the growth solution with a final concentration of 7 g/L PVP K30 and 9.5 mM (1.61 g/L) AgNO 3 . The optimal amount of NaBH 4 was determined by 24 consecutive additions of 100 μL freshly prepared 0.2 M NaBH 4 in cold DI water to the solution while mixing.…”

Section: Methodsmentioning

confidence: 99%

“…In addition to the special optical properties of nanoplate morphology, it was found that stacking faults and twin boundaries at the edges of nanoplate crystals enhance the catalytic activity. 30 This fact makes silver nanoplates more catalytically active 31 compared to thermodynamically favored cuboctahedrons. 32 …”

Section: Introductionmentioning

confidence: 99%

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Simple and Tailorable Synthesis of Silver Nanoplates in Gram Quantities

Mravljak

Podgornik

2023

ACS Omega

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Due to plasmonic and catalytic properties, silver nanoplates are of significant interest; therefore, their simple preparation in gram quantities is required. Preferably, the method is seedless, consists of few reagents, enables preparation of silver nanoplates with desired optical properties in high concentration, is scalable, and allows their long-term storage. The developed method is based on silver nitrate, sodium borohydride, polyvinylpyrrolidone, and H 2 O 2 as the main reagents, while antifoam A204 is implemented to achieve better product quality on a larger scale. The effect of each component was evaluated and optimized. Solution volumes from 3 to 450 mL and concentrations of silver nanoplates from 0.88 to 4.8 g/L were tested. Their size was tailored from 25 nm to 8 μm simply by H 2 O 2 addition, covering the entire visible plasmon spectra and beyond. They can be dried and spontaneously dispersed after at least one month of storage in the dark without any change in plasmonic properties. Their potential use in modern art was demonstrated by drying silver colloids on different surfaces in the presence of reagents or purified, resulting in a variety of colors but, more importantly, patterns of varying complexity, from simple multi-coffee-rings structures to dendritic forms and complex multilevel Sierpinśki triangle fractals.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple and Tailorable Synthesis of Silver Nanoplates in Gram Quantities

Mravljak

Podgornik

2023

ACS Omega

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Monolithic Catalysts Supported by Emulsion-Templated Porous Polydivinylbenzene for Continuous Reduction of 4-Nitrophenol

Chen,

Gao,

Zuo

et al. 2024

Langmuir

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A monolithic catalyst was fabricated through an emulsiontemplating method, postpolymerization modification, and in situ loading of active constituents. To achieve a high specific surface area, divinylbenzene (DVB) was solely employed as the monomer, while the porous structure was adjusted with the porogen content and the types of initiators. Then, anchor points were introduced on the pore wall through nitration and amination of the polymeric scaffold. Using a controlled "silver mirror reaction", monolithic catalysts were obtained after loading of silver nanoparticles (Ag NPs), which was verified from morphological and crystallinity characteristics. The catalytic performance of the resultant monolithic catalyst was determined with the model reduction of 4nitrophenol (4-NP). In static catalysis, the monolithic catalyst was proved to have a reactively high apparent rate constant and a good reusability. Furthermore, a flow reactor was fabricated with the monolithic catalyst, showing a high efficiency and long-term durability for the continuous reduction of 4-NP. This work broadened the adjustment of porous structures and the subsequent application for emulsion-templated monoliths.

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Mechanism of Interconnected Pore Formation in High Internal Phase Emulsion-Templated Polymer

Zhang,

Chen,

You

et al. 2024

ACS Macro Lett.

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High internal phase emulsion-templated polymer, named polyHIPE, has received widespread attention due to its great potential applications in many fields, such as separation, adsorption, heterogeneous catalysis, and sound absorption. The broad applicability is largely dependent on its adjustable opening structure. However, the question of why polyHIPE has an interconnected pore network structure is still to be discussed. Herein, different types (w/o, o/w, and o/o) of HIPEs are prepared and subsequently detected with laser scanning confocal microscopy (LSCM), and the polyHIPEs obtained by curing the HIPEs are characterized by SEM. The observations suggest that the interconnected pore formation is primarily due to the presence of the surfactant-rich phase in the film between the neighboring droplets in HIPE. The interconnected pores are generated by removal of the surfactant-rich domains in the postcuring procedure, and their sizes would be enlarged if the solubility of the surfactant in the continuous phase decreases in the curing stage.

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Tubular catalytic polyHIPE reactor with deposited silver nanoplate nanoparticles

Cited by 4 publications

References 107 publications

Simple and Tailorable Synthesis of Silver Nanoplates in Gram Quantities

Simple and Tailorable Synthesis of Silver Nanoplates in Gram Quantities

Monolithic Catalysts Supported by Emulsion-Templated Porous Polydivinylbenzene for Continuous Reduction of 4-Nitrophenol

Mechanism of Interconnected Pore Formation in High Internal Phase Emulsion-Templated Polymer

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