Cavitation-enabled rapid and tunable evolution of high-χN micelles as templates for ordered mesoporous oxides

Lokupitiya, Hasala N.; Stefik, Morgan

doi:10.1039/c6nr07313a

Cited by 17 publications

(25 citation statements)

References 36 publications

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“…Persistent micelle templates (PMTs) recently emerged as a unique approach to realize isomorphic sample series (constant morphology symmetry) with independent control of each feature size, namely the wall‐thickness and pore size. PMT has advanced to span a wide range of dimensions from mesoporous to macroporous materials . PMT is based on kinetic control where micelle exchange mechanisms are suppressed to preserve a constant micelle diameter (constant template).…”

Section: Introductionmentioning

confidence: 99%

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Lantz

Clamp

Bergh

et al. 2019

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The predictive self‐assembly of tunable nanostructures is of great utility for broad nanomaterial investigations and applications. The use of equilibrium‐based approaches however prevents independent feature size control. Kinetic‐controlled methods such as persistent micelle templates (PMTs) overcome this limitation and maintain constant pore size by imposing a large thermodynamic barrier to chain exchange. Thus, the wall thickness is independently adjusted via addition of material precursors to PMTs. Prior PMT demonstrations added water‐reactive material precursors directly to aqueous micelle solutions. That approach depletes the thermodynamic barrier to chain exchange and thus limits the amount of material added under PMT‐control. Here, an ex situ hydrolysis method is developed for TiO2 that mitigates this depletion of water and nearly decouples materials chemistry from micelle control. This enables the widest reported PMT range (M:T = 1.6–4.0), spanning the gamut from sparse walls to nearly isolated pores with ≈2 Å precision adjustment. This high‐resolution nanomaterial series exhibits monotonic trends where PMT confinement within increasing wall‐thickness leads to larger crystallites and an increasing extent of lithiation, reaching Li0.66TiO2. The increasing extent of lithiation with increasing anatase crystallite dimensions is attributed to the size‐dependent strain mismatch of anatase and bronze polymorph mixtures.

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Section: Introductionmentioning

confidence: 99%

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Lantz

Clamp

Bergh

et al. 2019

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“…Each film was spin coated for 30 s at 1000, 1500, 2000, and 2150 rpm under 15% relative humidity for each M:T condition of 1.2, 1.8, 2.4, and 3.0, respectively, as described in detail elsewhere. [ 61,63,94 ] Immediately after the end of spin coating, each sample was removed from the humidity‐controlled chamber and placed on a 110 °C hot plate overnight to crosslink the oxide, termed as “aging.” The room humidity during aging was not found to have an effect. Aging conditions were optimized to prevent initial dewetting and to assure sufficient oxide connectivity to survive calcination.…”

Section: Methodsmentioning

confidence: 99%

Nanostructure Dependence of T‐Nb₂O₅ Intercalation Pseudocapacitance Probed Using Tunable Isomorphic Architectures

Bergh

Lokupitiya

Vest

et al. 2020

Adv Funct Materials

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Intercalation pseudocapacitance has emerged as a promising energy storage mechanism that combines the energy density of intercalation materials with the power density of capacitors. Niobium pentoxide was the first material described as exhibiting intercalation pseudocapacitance. The electrochemical kinetics for charging/discharging this material are surface‐limited for a wide range of conditions despite intercalation via diffusion. Investigations of niobium pentoxide nanostructures are diverse and numerous; however, none have yet compared performance while adjusting a single architectural parameter at a time. Such a comparative approach reduces the reliance on models and the associated assumptions when seeking nanostructure–property relationships. Here, a tailored isomorphic series of niobium pentoxide nanostructures with constant pore size and precision tailored wall thickness is examined. The sweep rate at which niobium pentoxide transitions from being surface‐limited to being diffusion‐limited is shown to depend sensitively upon the nanoscale dimensions of the niobium pentoxide architecture. Subsequent experiments probing the independent effects of electrolyte concentration and film thickness unambiguously identify solid‐state lithium diffusion as the dominant diffusion constraint even in samples with just 48.5–67.0 nm thick walls. The resulting architectural dependencies from this type of investigation are critical to enable energy‐dense nanostructures that are tailored to deliver a specific power density.

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“…A recent study showed that ultrasound can accelerate micelle growth by an order of magnitude with respect to agitation by vortex [44]. Cavitation effect enhance the production of bubbles, which increases the interfaces air/water.…”

Section: Effect Of Ultrasound On Electrolysismentioning

confidence: 99%

Effects of ultrasound irradiation on the electrochemical treatment of wastes containing micelles

Dionísio

Motheo

Sáez

et al. 2019

Applied Catalysis B: Environmental

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Cavitation-enabled rapid and tunable evolution of high-χN micelles as templates for ordered mesoporous oxides

Cited by 17 publications

References 36 publications

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Nanostructure Dependence of T‐Nb₂O₅ Intercalation Pseudocapacitance Probed Using Tunable Isomorphic Architectures

Effects of ultrasound irradiation on the electrochemical treatment of wastes containing micelles

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Cavitation-enabled rapid and tunable evolution of high-χN micelles as templates for ordered mesoporous oxides

Cited by 17 publications

References 36 publications

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Full Gamut Wall Tunability from Persistent Micelle Templates via Ex Situ Hydrolysis

Nanostructure Dependence of T‐Nb2O5 Intercalation Pseudocapacitance Probed Using Tunable Isomorphic Architectures

Effects of ultrasound irradiation on the electrochemical treatment of wastes containing micelles

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Nanostructure Dependence of T‐Nb₂O₅ Intercalation Pseudocapacitance Probed Using Tunable Isomorphic Architectures