Search

Your search keyword '"Kowalewski, Tomasz"' showing total 32 results
Start Over Author "Kowalewski, Tomasz" Journal macromolecules
32 results on '"Kowalewski, Tomasz"'

10. Controlled Preparation of Well-Defined Mesoporous Carbon/Polymer Hybrids via Surface-Initiated ICAR ATRP with a High Dilution Strategy Assisted by Facile Polydopamine Chemistry

Author

Song, Yang, primary, Ye, Gang, additional, Wang, Zongyu, additional, Kopeć, Maciej, additional, Xie, Guojun, additional, Yuan, Rui, additional, Chen, Jing, additional, Kowalewski, Tomasz, additional, Wang, Jianchen, additional, and Matyjaszewski, Krzysztof, additional

Published
2016
Full Text
View/download PDF

13. Nanoporous Polystyrene and Carbon Materials with Core–Shell Nanosphere-Interconnected Network Structure

Author

Wu, Dingcai, primary, Hui, Chin Ming, additional, Dong, Hongchen, additional, Pietrasik, Joanna, additional, Ryu, Hyung Ju, additional, Li, Zhenghui, additional, Zhong, Mingjiang, additional, He, Hongkun, additional, Kim, Eun Kyung, additional, Jaroniec, Mietek, additional, Kowalewski, Tomasz, additional, and Matyjaszewski, Krzysztof, additional

Published
2011
Full Text
View/download PDF

31. Water-Dispersible Carbon Black Nanocomposites Prepared by Surface-Initiated Atom Transfer Radical Polymerization in Protic Media

Author

Liu, Tianqi, Jia, Shijun, Kowalewski, Tomasz, Matyjaszewski, Krzysztof, Casado-Portilla, Rosa, and Belmont, James

Abstract

The synthesis of hydrophilic carbon black composites by grafting 2-(dimethylamino)ethyl methacrylate (DMAEMA) from functionalized carbon black using atom transfer radical polymerization (ATRP) is reported. The polymerizations were performed in methanol/water mixtures near ambient temperatures using CuBr/CuBr2/2,2‘-bipyridine as the catalytic system. Under acidic conditions or upon quaternization with ethyl bromide, the polymer-bound carbon black can form stable dispersions in water. TGA, light scattering, and AFM were used to characterize the polymer bound carbon black. 2-Hydroxyethyl methacrylate (HEMA) was random and block copolymerized with DMAEMA to form functional carbon black nanocomposites.

Published
2006
Full Text
View/download PDF

32. Single-Material Organic Solar Cells Based on Electrospun Fullerene-Grafted Polythiophene Nanofibers

Author

Massimiliano Lanzi, Krzysztof Zembrzycki, Tomasz Kowalewski, Sylwia Pawłowska, Olga Urbanek, Filippo Pierini, Paweł Nakielski, Pierini, Filippo, Lanzi, Massimiliano, Nakielski, Pawel, Pawlowska, Sylwia, Urbanek, Olga, Zembrzycki, Krzysztof, and Kowalewski, Tomasz Aleksander

Subjects
Fullerene, Nanostructure, Materials science, Polymers and Plastics, Organic solar cell, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, Inorganic Chemistry, chemistry.chemical_compound, law, Solar cell, Materials Chemistry, Copolymer, chemistry.chemical_classification, Organic Chemistry, Nanofiber, Polymer, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Organic Solar Cell, chemistry, Polythiophene, polythiophene: Fullerene, 0210 nano-technology
Abstract

Highly efficient single-material organic solar cells (SMOCs) based on fullerene-grafted polythiophenes were fabricated by incorporating electrospun one-dimensional (1D) nanostructures obtained from polymer chain stretching. Poly(3-alkylthiophene) chains were chemically tailored in order to reduce the side effects of charge recombination which severely affected SMOC photovoltaic performance. This enabled us to synthesize a donor-acceptor conjugated copolymer with high solubility, molecular weight, regioregularity, and fullerene content. We investigated the correlations among the active layer hierarchical structure given by the inclusion of electrospun nanofibers and the solar cell photovoltaic properties. The results indicated that SMOC efficiency can be strongly increased by optimizing the supramolecular and nanoscale structure of the active layer, while achieving the highest reported efficiency value (PCE = 5.58%). The enhanced performance may be attributed to well-packed and properly oriented polymer chains. Overall, our work demonstrates that the active material structure optimization obtained by including electrospun nanofibers plays a pivotal role in the development of efficient SMOCs and suggests an interesting perspective for the improvement of copolymer-based photovoltaic device performance using an alternative pathway.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results