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Your search keyword '"Avestro, Alyssa-Jennifer"' showing total 32 results
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32 results on '"Avestro, Alyssa-Jennifer"'

3. 3D‐Printing Multi‐Component Multi‐Domain Supramolecular Gels with Differential Conductivity.

Author

Vadukoote, Tajmon Tony, Avestro, Alyssa‐Jennifer, and Smith, David K.

Subjects
*GOLD nanoparticles, *TISSUE engineering, *THREE-dimensional printing, *NANOELECTRONICS, *STRIPES
Abstract

We report the use of wet‐spinning to 3D‐print gels from low‐molecular‐weight gelators (LMWGs) based on the 1,3 : 2,4‐dibenzylidenesorbitol (DBS) scaffold. Gel stripes assembled from DBS‐CONHNH2 and DBS‐COOH are printed, and their conductivities assessed. Printed gels based on DBS‐CONHNH2 can be loaded with Au(III), which is reduced in situ to form embedded gold nanoparticles (AuNPs). The conductivity of these gels increases because of electron transport mediated by the AuNPs, whereas the conductivity of DBS‐COOH, which does not promote AuNP formation, remains lower. We then fabricate multi‐component gel patterns comprised of spatially well‐defined domains of printed DBS‐CONHNH2/AuNP (higher conductivity) and DBS‐COOH (lower conductivity) resulting in soft multi‐domain materials with differential conductivity. Such materials have future prospects in applications such as soft nanoelectronics or tissue engineering. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Rupturing Aromaticity by Periphery Overcrowding

Author

Saha, Promeet, primary, Mallick, Abhijit, additional, Turley, Andrew, additional, Bismillah, Aisha, additional, Danos, Andrew, additional, Monkman, Andrew, additional, Avestro, Alyssa-Jennifer, additional, Yufit, Dmitry, additional, and McGonigal, Paul, additional

Published
2022
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9. Enhancing the Efficiency of a Dye-Sensitized Solar Cell Based on a Metal Oxide Nanocomposite Gel Polymer Electrolyte

Author

Saidi, Norshahirah M., Omar, Fatin Saiha, Numan, Arshid, Apperley, David C., Algaradah, Mohammed M., Kasi, Ramesh, Avestro, Alyssa Jennifer, and Subramaniam, Ramesh T.

Abstract

To overcome the critical limitations of liquid-electrolyte-based dye-sensitized solar cells, quasi-solid-state electrolytes have been explored as a means of addressing long-term device stability, albeit with comparatively low ionic conductivities and device performances. Although metal oxide additives have been shown to augment ionic conductivity, their propensity to aggregate into large crystalline particles upon high-heat annealing hinders their full potential in quasi-solid-state electrolytes. In this work, sonochemical processing has been successfully applied to generate fine Co3O4 nanoparticles that are highly dispersible in a PAN:P(VP-co-VAc) polymer-blended gel electrolyte, even after calcination. An optimized nanocomposite gel polymer electrolyte containing 3 wt % sonicated Co3O4 nanoparticles (PVVA-3) delivers the highest ionic conductivity (4.62 × 10-3 S cm-1) of the series. This property is accompanied by a 51% enhancement in the apparent diffusion coefficient of triiodide versus both unmodified and unsonicated electrolyte samples. The dye-sensitized solar cell based on PVVA-3 displays a power conversion efficiency of 6.46% under AM1.5 G, 100 mW cm-2. By identifying the optimal loading of sonochemically processed nanoparticles, we are able to generate a homogenous extended particle network that effectively mobilizes redox-active species through a highly amorphous host matrix. This effect is manifested in a selective 51% enhancement in photocurrent density (JSC = 16.2 mA cm-2) and a lowered barrier to N719 dye regeneration (RCT = 193 ω) versus an unmodified solar cell. To the best of our knowledge, this work represents the highest known efficiency to date for dye-sensitized solar cells based on a sonicated Co3O4-modified gel polymer electrolyte. Sonochemical processing, when applied in this manner, has the potential to make meaningful contributions toward the ongoing mission to achieve the widespread exploitation of stable and low-cost dye-sensitized solar cells.

Published
2019

11. Easy access to a family of polymer catalysts from modular star polymers

Author

Rodionov, Valentin, Haifeng Gao, Scroggins, Steven, Unruh, David A., Avestro, Alyssa-Jennifer, and Frechet, Jean M.J.

Subjects
Catalysis -- Analysis, Hydrophobicity -- Analysis, Polymers -- Structure, Polymers -- Chemical properties, Solvation -- Analysis, Chemistry
Abstract

A versatile and scalable synthesis of a water-dispersible modular star polymer platform with an enzyme-inspired hydrophobic interior is described. The cores of the stars are functionalized and the use of this material is explored for the creation of a local hydrophobic solvent environment in water and for site isolation of incompatible catalytic entities.

Published
2010

17. Lithium-Ion Batteries: A Rigid Naphthalenediimide Triangle for Organic Rechargeable Lithium-Ion Batteries (Adv. Mater. 18/2015)

Author

Chen, Dongyang, primary, Avestro, Alyssa-Jennifer, additional, Chen, Zonghai, additional, Sun, Junling, additional, Wang, Shuanjin, additional, Xiao, Min, additional, Erno, Zach, additional, Algaradah, Mohammed M., additional, Nassar, Majed S., additional, Amine, Khalil, additional, Meng, Yuezhong, additional, and Stoddart, J. Fraser, additional

Published
2015
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20. An ExBox [2]catenane

Author

Juríček, Michal, primary, Barnes, Jonathan C., additional, Strutt, Nathan L., additional, Vermeulen, Nicolaas A., additional, Ghooray, Kala C., additional, Dale, Edward J., additional, McGonigal, Paul R., additional, Blackburn, Anthea K., additional, Avestro, Alyssa-Jennifer, additional, and Stoddart, J. Fraser, additional

Published
2014
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25. The Chameleonic Nature of Diazaperopyrenium Recognition Processes

Author

Basuray, Ashish N., primary, Jacquot de Rouville, Henri-Pierre, additional, Hartlieb, Karel J., additional, Kikuchi, Takashi, additional, Strutt, Nathan L., additional, Bruns, Carson J., additional, Ambrogio, Michael W., additional, Avestro, Alyssa-Jennifer, additional, Schneebeli, Severin T., additional, Fahrenbach, Albert C., additional, and Stoddart, J. Fraser, additional

Published
2012
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26. Organic Switches for Surfaces and Devices

Author

Fahrenbach, Albert C., primary, Warren, Scott C., additional, Incorvati, Jared T., additional, Avestro, Alyssa-Jennifer, additional, Barnes, Jonathan C., additional, Stoddart, J. Fraser, additional, and Grzybowski, Bartosz A., additional

Published
2012
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31. Asymmetric Anion-π Catalysis of Iminium/Nitroaldol Cascades To Form Cyclohexane Rings with Five Stereogenic Centers Directly on π-Acidic Surfaces.

Author

Liu L, Cotelle Y, Avestro AJ, Sakai N, and Matile S

Abstract

Anion-π interactions have been introduced to catalysis only recently, and evidence for their significance is so far limited to one classical model reaction in enolate and enamine chemistry. In this report, asymmetric anion-π catalysis is achieved for the first time for a more demanding cascade process. The selected example affords six-membered carbocycles with five stereogenic centers in a single step from achiral and acyclic substrates. Rates, yields, turnover, diastereo- and enantioselectivity are comparable with conventional catalysts. Rates and stereoselectivity increase with the π-acidity of the new anion-π catalysts. Further support for operational anion-π interactions in catalysis is obtained from inhibition with nitrate. As part of the stereogenic cascade reaction, iminium chemistry and conjugate additions are added to the emerging repertoire of asymmetric anion-π catalysis.

Published
2016
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32. Gated electron sharing within dynamic naphthalene diimide-based oligorotaxanes.

Author

Avestro AJ, Gardner DM, Vermeulen NA, Wilson EA, Schneebeli ST, Whalley AC, Belowich ME, Carmieli R, Wasielewski MR, and Stoddart JF

Subjects
Catalysis, Electron Spin Resonance Spectroscopy, Hydrogen Bonding, Models, Molecular, Molecular Conformation, Electrons, Imides chemistry, Naphthalenes chemistry, Rotaxanes chemistry
Abstract

The controlled self-assembly of well-defined and spatially ordered π-systems has attracted considerable interest because of their potential applications in organic electronics. An important contemporary pursuit relates to the investigation of charge transport across noncovalently coupled components in a stepwise fashion. Dynamic oligorotaxanes, prepared by template-directed methods, provide a scaffold for directing the construction of monodisperse one-dimensional assemblies in which the functional units communicate electronically through-space by way of π-orbital interactions. Reported herein is a series of oligorotaxanes containing one, two, three and four naphthalene diimide (NDI) redox-active units, which have been shown by cyclic voltammetry, and by EPR and ENDOR spectroscopies, to share electrons across the NDI stacks. Thermally driven motions between the neighboring NDI units in the oligorotaxanes influence the passage of electrons through the NDI stacks in a manner reminiscent of the conformationally gated charge transfer observed in DNA., (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2014
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