LIVIVO - Search results -

Search results

Result 1 - 10 of total 33

Search options

Article: Polytriphenylamine composites for energy storage electrodes: effect of pendant vs. backbone polymer architecture of the electroactive group

Dianatdar, Afshin / Akin, Okan / Mongatti, Irene / Momand, Jamo / Ruggeri, Giacomo / Picchioni, Francesco / Bose, Ranjita K.

RSC advances. 2021 Nov. 01, v. 11, no. 56

2021

Abstract: Polymers are an increasingly used class of materials in semiconductors, photovoltaics and energy storage. Polymers bearing triphenylamine (TPA) or its derivatives in their structures have shown promise for application in electrochemical energy storage ... ...

Abstract	Polymers are an increasingly used class of materials in semiconductors, photovoltaics and energy storage. Polymers bearing triphenylamine (TPA) or its derivatives in their structures have shown promise for application in electrochemical energy storage devices. The aim of this work is to systematically synthesize polymers bearing TPA units either as pendant groups or directly along the backbone of the polymer and evaluate their performance as electrochemical energy storage electrode materials. The first was obtained via radical polymerization of an acrylate monomer bearing TPA as a side group, resulting in a non-conjugated polymer with individual redox active sites (rP). The latter was obtained by oxidative polymerization of a substituted TPA, resulting in a conjugated polymer with TPA units along its backbone (cP). These polymers were then developed into electrodes by separately blending them with multi-wall carbon nanotubes (rC and cC). The electrodes were characterized and their charge storage stability and mechanical properties were investigated for up to 1000 cycles by cyclic voltammetry, galvanostatic charge–discharge measurements and nanoindentation. The results show that cC offers a higher initial charge capacity than rC as well as improved carbon nanotube dispersion due to its conjugated structure. Although the improved dispersion results in a higher elastic modulus for cC (compared to rC), the stiffer nature of cP made it more vulnerable to degrade upon repetitive volumetric change, while with rP, the decoupled acrylate monomer remained more protected when its redox active units of TPA underwent charge–discharge cycling.
Keywords	carbon nanotubes ; electrochemistry ; electrodes ; energy ; modulus of elasticity ; polymerization ; polymers ; solar energy ; storage quality ; voltammetry
Language	English
Dates of publication	2021-1101
Size	p. 35187-35196.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/d1ra06415k
Database	NAL-Catalogue (AGRICOLA)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: A 4,4'-bis(2-benzoxazolyl)stilbene luminescent probe: assessment of aggregate formation through photophysics experiments and quantum-chemical calculations.

Battisti, Antonella / Ambrosetti, Matteo / Ruggeri, Giacomo / Cappelli, Chiara / Pucci, Andrea

Physical chemistry chemical physics : PCCP

2018 Volume 20, Issue 41, Page(s) 26249–26258

Abstract: A combination of experimental and quantum mechanical investigations is applied to the study of the optical features of 4,4'-bis(2-benzoxazolyl)stilbene (BBS) dissolved in solution or in a poly(l-lactic acid) (PLA) thermoplastic matrix at different ... ...

Abstract	A combination of experimental and quantum mechanical investigations is applied to the study of the optical features of 4,4'-bis(2-benzoxazolyl)stilbene (BBS) dissolved in solution or in a poly(l-lactic acid) (PLA) thermoplastic matrix at different concentrations. The experimental analyses allow the characterization of BBS solutions and dispersions in terms of absorption and emission features, along with the collection of some key parameters such as fluorescence quantum yield, anisotropy and lifetime, while the computational approach gives a detailed description of the photophysical behavior of BBS in the different environments. For the 10
Language	English
Publishing date	2018-10-16
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/c8cp04450c
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Polytriphenylamine composites for energy storage electrodes: effect of pendant

Dianatdar, Afshin / Akin, Okan / Mongatti, Irene / Momand, Jamo / Ruggeri, Giacomo / Picchioni, Francesco / Bose, Ranjita K

RSC advances

2021 Volume 11, Issue 56, Page(s) 35187–35196

Abstract	Polymers are an increasingly used class of materials in semiconductors, photovoltaics and energy storage. Polymers bearing triphenylamine (TPA) or its derivatives in their structures have shown promise for application in electrochemical energy storage devices. The aim of this work is to systematically synthesize polymers bearing TPA units either as pendant groups or directly along the backbone of the polymer and evaluate their performance as electrochemical energy storage electrode materials. The first was obtained
Language	English
Publishing date	2021-11-01
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d1ra06415k
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Structure and Dynamics of Perylene Bisimide Pigments for “Cool” Organic Coatings by Solid-State NMR: A Combined Experimental and DFT Study

Martini, Francesca / Geppi, Marco / Barcaro, Giovanni / Monti, Susanna / Contiero, Luca / Ruggeri, Giacomo / Lessi, Marco / Pucci, Andrea / Bellina, Fabio / Borsacchi, Silvia

Journal of physical chemistry. 2020 July 22, v. 124, no. 33

2020

Abstract: In this work, a combination of high-resolution solid-state nuclear magnetic resonance (SSNMR) experiments and density functional theory calculations has been exploited for obtaining a detailed characterization of the structural and dynamic properties of ... ...

Abstract	In this work, a combination of high-resolution solid-state nuclear magnetic resonance (SSNMR) experiments and density functional theory calculations has been exploited for obtaining a detailed characterization of the structural and dynamic properties of the perylene bisimide derivative (PBI) Paliogen Black L0086 (P-black). This “cool” organic pigment is characterized by unusual transparent, reflective, and cooling features in the near-infrared (NIR) spectrum. A full assignment of the ¹³C SSNMR spectrum was achieved, highlighting correlations between ¹³C isotropic chemical shifts and specific supramolecular features. The π-flip motion of the phenyl rings of the methoxybenzyl side groups bonded to the imide nitrogen atoms was characterized in the 310–386 K temperature range, determining activation energy and correlation times. This motion showed a strong dependence on the supramolecular order of P-black and the length of the alkyl linker between the side group and the perylene bisimide core. The results obtained in this work open the way to investigations on similar PBI pigments, aiming at achieving a collection of molecular, supramolecular, and NIR data that could allow the identification of the main factors determining the NIR performance.
Keywords	activation energy ; density functional theory ; isotropy ; nitrogen ; nuclear magnetic resonance spectroscopy ; physical chemistry ; temperature
Language	English
Dates of publication	2020-0722
Size	p. 17971-17980.
Publishing place	American Chemical Society
Document type	Article
Note	NAL-AP-2-clean
ISSN	1932-7455
DOI	10.1021/acs.jpcc.0c04940
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Vapochromic features of new luminogens based on julolidine-containing styrene copolymers.

Iasilli, Giuseppe / Martini, Fabio / Minei, Pierpaolo / Ruggeri, Giacomo / Pucci, Andrea

Faraday discussions

2016 Volume 196, Page(s) 113–129

Abstract: We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized ... ...

Abstract	We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized with cyanovinyl-julolidine moieties of different compositions were prepared, (P(STY-co-JCAEM)(m) with m = 0.06-0.61). The sensing performance of the spin-coated copolymer films demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and a favourable interaction with the polymer matrix, such as Et
Language	English
Publishing date	2016-11-25
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1359-6640
ISSN	1359-6640
DOI	10.1039/c6fd00151c
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Dye-containing polymers: methods for preparation of mechanochromic materials

Ciardelli, Francesco / Ruggeri, Giacomo / Pucci, Andrea

Chemical Society reviews. 2013 Jan. 14, v. 42, no. 3

2013

Abstract: The detection of mechanical stress in polymeric materials through optical variations has attracted considerable interest over the past ten years. In this tutorial review, the current state of knowledge concerning the preparation of polymers with ... ...

Abstract	The detection of mechanical stress in polymeric materials through optical variations has attracted considerable interest over the past ten years. In this tutorial review, the current state of knowledge concerning the preparation of polymers with mechanochromic features is summarized. Two types of procedures are illustrated and thoroughly discussed along with their respective structure–property relationships: the first resides in the physical dispersion of the dye in the form of supramolecular aggregates in a preformed polymer matrix; the second involves the covalent insertion of chromophoric units into the macromolecule backbone or side chains. Herein we review the simplicity of the preparative routes available, and their influence over the properties of the resulting dye–polymer systems, by focussing on the most illustrative examples described in the literature. Special reference is made to stimuli-responsiveness as a mechanical means towards innovative smart and intelligent materials.
Keywords	dyes ; mechanical stress ; polymers
Language	English
Dates of publication	2013-0114
Size	p. 857-870.
Publishing place	The Royal Society of Chemistry
Document type	Article
ZDB-ID	1472875-8
ISSN	1460-4744 ; 0306-0012
ISSN (online)	1460-4744
ISSN	0306-0012
DOI	10.1039/c2cs35414d
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Dye-containing polymers: methods for preparation of mechanochromic materials.

Ciardelli, Francesco / Ruggeri, Giacomo / Pucci, Andrea

Chemical Society reviews

2013 Volume 42, Issue 3, Page(s) 857–870

Abstract	The detection of mechanical stress in polymeric materials through optical variations has attracted considerable interest over the past ten years. In this tutorial review, the current state of knowledge concerning the preparation of polymers with mechanochromic features is summarized. Two types of procedures are illustrated and thoroughly discussed along with their respective structure-property relationships: the first resides in the physical dispersion of the dye in the form of supramolecular aggregates in a preformed polymer matrix; the second involves the covalent insertion of chromophoric units into the macromolecule backbone or side chains. Herein we review the simplicity of the preparative routes available, and their influence over the properties of the resulting dye-polymer systems, by focussing on the most illustrative examples described in the literature. Special reference is made to stimuli-responsiveness as a mechanical means towards innovative smart and intelligent materials.
Language	English
Publishing date	2013-02-07
Publishing country	England
Document type	Journal Article
ZDB-ID	1472875-8
ISSN	1460-4744 ; 0306-0012
ISSN (online)	1460-4744
ISSN	0306-0012
DOI	10.1039/c2cs35414d
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: pH-responsive host–guest polymerization and blending

Masseroni, Daniele / Dalcanale, Enrico / Orsi, Davide / Rampazzo, Enrico / Rastrelli, Federico / Ricci, Lucia / Ruggeri, Giacomo

RSC advances. 2015 Jan. 19, v. 5, no. 15

2015

Abstract: In this work, we demonstrate – in two different settings – the potential of the recognition motif made by tetraphosphonate cavitand/N-methyl ammonium salt for the development of supramolecular polymer chemistry. In the first part a novel pH sensitive ... ...

Abstract	In this work, we demonstrate – in two different settings – the potential of the recognition motif made by tetraphosphonate cavitand/N-methyl ammonium salt for the development of supramolecular polymer chemistry. In the first part a novel pH sensitive supramolecular homopolymer was assembled by proper design of the corresponding monomer, and monitoring the self-assembling process by several analytical tools, including NMR spectroscopy and light scattering techniques. These measurements provided the evidence for the formation of the homopolymer and its pH responsiveness. In the second study, the two recognition groups – tetraphosphonate cavitand (Host) and sarcosine hydrochloride (Sarc) – introduced in polystyrene (PS–Host) and poly(butyl methacrylate) (PBMA–Sarc) respectively, led to the mixing of the two otherwise immiscible polymers thanks to the energetically favourable host–guest interactions between the polymer chains. The polymer blending was verified by the presence of a single glass transition temperature (Tg) and showed its homogeneous morphology by atomic force microscopy (AFM).
Keywords	ammonium salts ; atomic force microscopy ; glass transition temperature ; light scattering ; mixing ; monitoring ; nuclear magnetic resonance spectroscopy ; pH ; phosphonates ; polymerization ; polystyrenes ; sarcosines
Language	English
Dates of publication	2015-0119
Size	p. 11334-11342.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/c4ra14793f
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Mechanochromic LLDPE Films Doped with NIR Reflective Paliogen Black.

Micheletti, Cosimo / Minei, Pierpaolo / Carlotti, Marco / Mattoli, Virgilio / Muniz-Miranda, Francesco / Perfetto, Anna / Ciofini, Ilaria / Adamo, Carlo / Ruggeri, Giacomo / Pucci, Andrea

Macromolecular rapid communications

2020 Volume 42, Issue 1, Page(s) e2000426

Abstract: The perylene bisimide derivative Paliogen Black (P-black) is proposed as a new chromogenic probe that shows visible (vis) and near-infrared (NIR) responses after mechanical solicitations of host linear low-density polyethylene (LLDPE) films. P-black is ... ...

Abstract	The perylene bisimide derivative Paliogen Black (P-black) is proposed as a new chromogenic probe that shows visible (vis) and near-infrared (NIR) responses after mechanical solicitations of host linear low-density polyethylene (LLDPE) films. P-black is reported to display strong absorption in the vis spectrum and unusual reflective and cooling features in the NIR region. Uniaxial deformation of the 2.5, 5, and 10 wt% P-black/LLDPE films yields a dichroic absorption under polarized light with color variations attributed by the computational analysis to the distinct anisotropic behavior of the transition dipole moments of P-black chromophores. When LLDPE films are deformed, P-black aggregates reduce their size from ≈30-40 µm to ≈5-10 µm that, in turn, causes reflectivity losses of about 30-40% at the maximum elongation. This gives rise to warming of 5-6 °C of the locally oriented film placed in contact with a black substrate under the illumination with an IR lamp for 5 s. These features combined with the high sensitivity of the vis-NIR response toward mechanical solicitations render P-black as a new solution to detect uniaxial deformations of plastic films through both optical and thermal outputs.
MeSH term(s)	Plastics ; Polyethylene
Chemical Substances	Plastics ; Polyethylene (9002-88-4)
Language	English
Publishing date	2020-10-21
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1475027-2
ISSN	1521-3927 ; 1022-1336
ISSN (online)	1521-3927
ISSN	1022-1336
DOI	10.1002/marc.202000426
Database	MEDical Literature Analysis and Retrieval System OnLINE

Full text online

Accessible to users with ZB MED library card

Order via subito

Details ▾
- Full text online
- Order with fees

Article: Synthesis, Characterization, and Solid-State NMR Investigation of Organically Modified Bentonites and Their Composites with LDPE

Borsacchi, Silvia / Geppi Marco / Liuzzo Vincenzo / Ricci Lucia / Ruggeri Giacomo / Sudhakaran Umayal

Langmuir. 2013 July 23, v. 29, no. 29

2013

Abstract: Polymer/clay nanocomposites show remarkably improved properties (mechanical properties, as well as decreased gas permeability and flammability, etc.) with respect to their microscale counterparts and pristine polymers. Due to the substantially apolar ... ...

Abstract	Polymer/clay nanocomposites show remarkably improved properties (mechanical properties, as well as decreased gas permeability and flammability, etc.) with respect to their microscale counterparts and pristine polymers. Due to the substantially apolar character of most of the organic polymers, natural occurring hydrophilic clays are modified into organophilic clays with consequent increase of the polymer/clay compatibility. Different strategies have been developed for the preparation of nanocomposites with improved properties, especially aimed at achieving the best dispersion of clay platelets in the polymer matrix. In this paper we present the preparation and characterization of polymer/clay nanocomposites composed of low-density polyethylene (LDPE) and natural clay, montmorillonite-containing bentonite. Two different forms of the clay have been considered: the first, a commercial organophilic bentonite (Nanofil 15), obtained by exchanging the natural cations with dimethyldioctadecylammonium (2Cââ) cations, and the second, obtained by performing a grafting reaction of an alkoxysilane containing a polymerizable group, 3-(trimethoxysilyl)propyl methacrylate (TSPM), onto Nanofil 15. Both the clays and LDPE/clay nanocomposites were characterized by thermal, FT-IR, and X-ray diffraction techniques. The samples were also investigated by means of Â²â¹Si, Â¹Â³C, and Â¹H solid-state NMR, obtaining information on the structural properties of the modified clays. Moreover, by exploiting the effect of bentonite paramagnetic (FeÂ³âº) ions on proton spinâlattice relaxation times (Tââs), useful information about the extent of the polymerâclay dispersion and their interfacial interactions could be obtained.
Keywords	bentonite ; blood platelets ; cations ; clay ; flammability ; Fourier transform infrared spectroscopy ; hydrophilicity ; iron ; mechanical properties ; nanocomposites ; nuclear magnetic resonance spectroscopy ; permeability ; polyethylene ; stable isotopes ; X-ray diffraction
Language	English
Dates of publication	2013-0723
Size	p. 9164-9172.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021%2Fla401686p
Database	NAL-Catalogue (AGRICOLA)

Order via subito

To top

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito