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Hydrophobic treatment is one of the most important interventions usually carried out for the conservation of stone artefacts and monuments. The study here reported aims to answer a general question about how two polymers confer different protective performance. Two fluorinated-based polymer formulates applied on samples of Cusa’s stone confer a different level of water repellence and water vapour permeability. The observed protection action is here explained on the basis of chemico-physical interactions. The distribution of the polymer in the pore network was investigated using scanning electron microscopy and X-ray microscopy. The interactions between the stone substrate and the protective agents were investigated by means of solid state NMR spectroscopy. The ss-NMR findings reveal no significant changes in the chemical neighbourhood of the observed nuclei of each protective agent when applied onto the stone surface and provide information on the changes in the organization and dynamics of the studied systems, as well as on the mobility of polymer chains. This allowed us to explain the different macroscopic behaviours provided by each protective agent to the stone substrate.
Veronica Ciaramitaro; Alberto Spinella; Francesco Armetta; Roberto Scaffaro; Emmanuel Gulino; George Kourousias; Alessandra Gianoncelli; Eugenio Caponetti; Maria Saladino. A New Methodological Approach to Correlate Protective and Microscopic Properties by Soft X-ray Microscopy and Solid State NMR Spectroscopy: The Case of Cusa’s Stone. Applied Sciences 2021, 11, 5767 .
AMA StyleVeronica Ciaramitaro, Alberto Spinella, Francesco Armetta, Roberto Scaffaro, Emmanuel Gulino, George Kourousias, Alessandra Gianoncelli, Eugenio Caponetti, Maria Saladino. A New Methodological Approach to Correlate Protective and Microscopic Properties by Soft X-ray Microscopy and Solid State NMR Spectroscopy: The Case of Cusa’s Stone. Applied Sciences. 2021; 11 (13):5767.
Chicago/Turabian StyleVeronica Ciaramitaro; Alberto Spinella; Francesco Armetta; Roberto Scaffaro; Emmanuel Gulino; George Kourousias; Alessandra Gianoncelli; Eugenio Caponetti; Maria Saladino. 2021. "A New Methodological Approach to Correlate Protective and Microscopic Properties by Soft X-ray Microscopy and Solid State NMR Spectroscopy: The Case of Cusa’s Stone." Applied Sciences 11, no. 13: 5767.
This work follows a previous one dealing with the state of conservation study of the wooden part of the roman Acqualadroni rostrum soon after its finding in the seabed of Acqualadroni (Messina, Italy). The archaeological survey and recovery were particularly relevant since this artefact is one of the two rostrums, nowadays known, found together with its wooden part. Following the recovery, it was consolidated by immersion in a melamine-formaldehyde resin (Kauramin) aqueous solution for eight months at the “Centro di Restauro del Legno Bagnato” (Pisa, Italy). The present investigation is aimed to determine at microscopic scale the wood state of conservation and to highlight interactions of the consolidant with wood components, by using solid-state NMR spectroscopy ten years after the consolidation treatment. Sampling by coring was exceptionally authorized, and the wood core was divided into seven aliquots as a function of depth. 13C cross-polarization magic angle spinning (13C{1H} CP-MAS NMR) spectra and variable contact time (VCT) experiments have been carried out to determine the cellulose crystallinity index, the lignin condensation degree and the holocellulose-lignin ratio. The interactions between the resin and the wood components were highlighted by T1ρH relaxation times determination and two-dimensional 13C–1H correlation (FSLG CP HETCOR) NMR experiments. Findings revealed specific interactions between the aromatic part of the resin and the lignin, as well as a network of hydrogen bonds involving all components of the system.
Alberto Spinella; Delia Francesca Chillura Martino; Maria Luisa Saladino; Federica Sammartino; Francesco Caruso; Eugenio Caponetti. Solid state NMR investigation of the roman Acqualadroni rostrum: tenth year assessment of the consolidation treatment of the wooden part. Cellulose 2020, 28, 1025 -1038.
AMA StyleAlberto Spinella, Delia Francesca Chillura Martino, Maria Luisa Saladino, Federica Sammartino, Francesco Caruso, Eugenio Caponetti. Solid state NMR investigation of the roman Acqualadroni rostrum: tenth year assessment of the consolidation treatment of the wooden part. Cellulose. 2020; 28 (2):1025-1038.
Chicago/Turabian StyleAlberto Spinella; Delia Francesca Chillura Martino; Maria Luisa Saladino; Federica Sammartino; Francesco Caruso; Eugenio Caponetti. 2020. "Solid state NMR investigation of the roman Acqualadroni rostrum: tenth year assessment of the consolidation treatment of the wooden part." Cellulose 28, no. 2: 1025-1038.
Oleanolic and ursolic acids are two ubiquitous isomeric triterpene phytochemicals known for their anticancer activity. A set of derivatives of the two compounds with a modified oxidation state and lipophylicity at C-3 and C-28 positions, were prepared and tested as anticancer agents versus the lines HepG2, Hep3B and HA22T/VGH of hepatocarcinoma, a strongly aggressive tumor that is not responsive toward the standard therapies. New derivatives containing a three carbons side chain on the C-3 position were synthetized in both stereoisomeric forms by the Barbier-Grignard procedure and three of them were found to be active toward all of the three targets. The implication of the transcriptional nuclear factor NF−κB in the mechanism of action was assessed for the more active compounds in the set, as hepatocellular carcinoma (HCC) cyto-types are known to overexpress NF−κB.
Gianfranco Fontana; Maurizio Bruno; Monica Notarbartolo; Manuela Labbozzetta; Paola Poma; Alberto Spinella; Sergio Rosselli. Cytotoxicity of oleanolic and ursolic acid derivatives toward hepatocellular carcinoma and evaluation of NF-κB involvement. Bioorganic Chemistry 2019, 90, 103054 .
AMA StyleGianfranco Fontana, Maurizio Bruno, Monica Notarbartolo, Manuela Labbozzetta, Paola Poma, Alberto Spinella, Sergio Rosselli. Cytotoxicity of oleanolic and ursolic acid derivatives toward hepatocellular carcinoma and evaluation of NF-κB involvement. Bioorganic Chemistry. 2019; 90 ():103054.
Chicago/Turabian StyleGianfranco Fontana; Maurizio Bruno; Monica Notarbartolo; Manuela Labbozzetta; Paola Poma; Alberto Spinella; Sergio Rosselli. 2019. "Cytotoxicity of oleanolic and ursolic acid derivatives toward hepatocellular carcinoma and evaluation of NF-κB involvement." Bioorganic Chemistry 90, no. : 103054.
In this study, the silk fabrics mordanted at the rates of 1%, 2%, 3%, 4%, 6%, 9%, 12%, 14%, 18%, 21%, 24%, 27%, 30%, 33% and 36% of alum (KAl(SO4)2.12H2O) were separately dyed with chrysin, quercetin dihydrate, 7,8-dihydroxyflavone and naringenin flavonoids. The CIEL*a*b* color values of the performed dyeings were measured and compared with each other. According to the results of the color measurement, the dyeings obtained using the mordant of 6% alum showed the best color values. The bonds relating to the amino acids present in Bombyx mori silk were characterized by FTIR. Also, the binding to the fibroin protein via Al-O and Al-N bonds of Al (coming from alum mordant) was determined. The amino acids including of pure silk were specified by 13C CP/MAS NMR. The coordination numbers of Al (III) ions in the complexes formed among the silk fibroin-mordant-dye were determined by 27Al MAS NMR.
Ozan Deveoglu; Recep Karadag; Alberto Spinella; Emine Torgan Guzel. Examination of Dyeing Properties on Silk of Some Flavonoids by Spectroscopic Techniques. Journal of Natural Fibers 2019, 18, 238 -249.
AMA StyleOzan Deveoglu, Recep Karadag, Alberto Spinella, Emine Torgan Guzel. Examination of Dyeing Properties on Silk of Some Flavonoids by Spectroscopic Techniques. Journal of Natural Fibers. 2019; 18 (2):238-249.
Chicago/Turabian StyleOzan Deveoglu; Recep Karadag; Alberto Spinella; Emine Torgan Guzel. 2019. "Examination of Dyeing Properties on Silk of Some Flavonoids by Spectroscopic Techniques." Journal of Natural Fibers 18, no. 2: 238-249.
Two different carbon nanoforms (CNFs), namely multi‐walled carbon nanotubes (MWCNTs) and carbon nanohorns (CNHs), have been chosen as support for the direct polymerization of a bis‐vinylimidazolium salt. Transmission electron microscopy analyses revealed a templating effect of the CNFs on the growth of the polymeric network, which perfectly covers their whole surfaces creating a cylindrical or spherical coating for MWCNTs and CNHs, respectively. Subsequently, the CNFs‐polyimidazolium have been used as stabilizers for Pd nanoparticles (Pd NPs), and the obtained materials have been characterized by means of analytical and spectroscopic techniques and then employed as easily recoverable and recyclable catalysts for Suzuki and Heck reactions. Quantitative conversions have been obtained in almost all the explored reactions, even employing low loading of catalyst (down to 0.007 mol%). Suzuki reactions were carried out in pure water under aerobic conditions. Both materials showed excellent activity and recyclability for the investigated C‐C coupling reactions, with the CNHs‐based material resulting slightly more active than the MWCNTs‐based one due to a higher superficial exposure of Pd NPs.
Vincenzo Campisciano; Carla Calabrese; Leonarda Francesca Liotta; Valeria La Parola; Alberto Spinella; Carmela Aprile; Michelangelo Gruttadauria; Francesco Giacalone. Templating effect of carbon nanoforms on highly cross‐linked imidazolium network: Catalytic activity of the resulting hybrids with Pd nanoparticles. Applied Organometallic Chemistry 2019, 33, 1 .
AMA StyleVincenzo Campisciano, Carla Calabrese, Leonarda Francesca Liotta, Valeria La Parola, Alberto Spinella, Carmela Aprile, Michelangelo Gruttadauria, Francesco Giacalone. Templating effect of carbon nanoforms on highly cross‐linked imidazolium network: Catalytic activity of the resulting hybrids with Pd nanoparticles. Applied Organometallic Chemistry. 2019; 33 (7):1.
Chicago/Turabian StyleVincenzo Campisciano; Carla Calabrese; Leonarda Francesca Liotta; Valeria La Parola; Alberto Spinella; Carmela Aprile; Michelangelo Gruttadauria; Francesco Giacalone. 2019. "Templating effect of carbon nanoforms on highly cross‐linked imidazolium network: Catalytic activity of the resulting hybrids with Pd nanoparticles." Applied Organometallic Chemistry 33, no. 7: 1.
Abies nebrodensis (Lojac.) Mattei (Pinaceae) is a species living in a very small population only in a confined area of Sicily. In this study, the dichloromethane extract of the leaves was analyzed. Apart from three already known metabolites namely dehydroabietic acid; maltol; and rheosmin, previously detected in other species of Abies, a lanostane derivative was isolated. Its chemical structure was elucidated by means of extensive spectroscopic methods.
Rosario Schicchi; Anna Geraci; Sergio Rosselli; Alberto Spinella; Antonella Maggio; Maurizio Bruno. Phytochemical investigation of the needles of Abies nebrodensis (Lojac.) Mattei. Natural Product Research 2019, 34, 2131 -2136.
AMA StyleRosario Schicchi, Anna Geraci, Sergio Rosselli, Alberto Spinella, Antonella Maggio, Maurizio Bruno. Phytochemical investigation of the needles of Abies nebrodensis (Lojac.) Mattei. Natural Product Research. 2019; 34 (15):2131-2136.
Chicago/Turabian StyleRosario Schicchi; Anna Geraci; Sergio Rosselli; Alberto Spinella; Antonella Maggio; Maurizio Bruno. 2019. "Phytochemical investigation of the needles of Abies nebrodensis (Lojac.) Mattei." Natural Product Research 34, no. 15: 2131-2136.
Two mixtures of polyaminoazides were synthesized by a nucleophilic displacement strategy providing no separation of the components. The mixtures were adequately characterized by means of combined HR-ESIMS, FTIR and NMR techniques and, despite their complexity, they were successfully used to accomplish the subsequent preparation of pH-sensitive calixarene hyper-reticulated nanosponge materials. The desired responsivity to pH variations of the nanosponges obtained was verified by means of absorption tests on a set of organic pollutant model molecules.
Antonella Di Vincenzo; Antonio Palumbo Piccionello; Alberto Spinella; Delia Chillura Martino; Marco Russo; Paolo Lo Meo. Polyaminoazide mixtures for the synthesis of pH-responsive calixarene nanosponges. Beilstein Journal of Organic Chemistry 2019, 15, 633 -641.
AMA StyleAntonella Di Vincenzo, Antonio Palumbo Piccionello, Alberto Spinella, Delia Chillura Martino, Marco Russo, Paolo Lo Meo. Polyaminoazide mixtures for the synthesis of pH-responsive calixarene nanosponges. Beilstein Journal of Organic Chemistry. 2019; 15 (1):633-641.
Chicago/Turabian StyleAntonella Di Vincenzo; Antonio Palumbo Piccionello; Alberto Spinella; Delia Chillura Martino; Marco Russo; Paolo Lo Meo. 2019. "Polyaminoazide mixtures for the synthesis of pH-responsive calixarene nanosponges." Beilstein Journal of Organic Chemistry 15, no. 1: 633-641.
Four new composite materials, formed by silver nanoparticles embedded in polyamino‐cyclodextrin nanosponge architectures, were designed exploiting the affinity of polyamino‐cyclodextrins towards Ag+ ions. These materials were characterized by means of different techniques (thermogravimetry, FT‐IR, solid state NMR, SEM, HR‐TEM), and tested as catalysts for the reduction of nitroarenes and the oxidative coupling of anilines. The results obtained showed synergistic activity between the supramolecular binding abilities of the nanosponge matrix and the catalytic properties of the metal nanoparticle, and open the way towards the design of new composite smart nanomaterials with improved catalytic performances.
Marco Russo; Alberto Spinella; Antonella Di Vincenzo; Giuseppe Lazzara; M. Rita Correro; Patrick Shahgaldian; Paolo Lo Meo; Eugenio Caponetti. Synergistic Activity of Silver Nanoparticles and Polyaminocyclodextrins in Nanosponge Architectures. ChemistrySelect 2019, 4, 873 -879.
AMA StyleMarco Russo, Alberto Spinella, Antonella Di Vincenzo, Giuseppe Lazzara, M. Rita Correro, Patrick Shahgaldian, Paolo Lo Meo, Eugenio Caponetti. Synergistic Activity of Silver Nanoparticles and Polyaminocyclodextrins in Nanosponge Architectures. ChemistrySelect. 2019; 4 (3):873-879.
Chicago/Turabian StyleMarco Russo; Alberto Spinella; Antonella Di Vincenzo; Giuseppe Lazzara; M. Rita Correro; Patrick Shahgaldian; Paolo Lo Meo; Eugenio Caponetti. 2019. "Synergistic Activity of Silver Nanoparticles and Polyaminocyclodextrins in Nanosponge Architectures." ChemistrySelect 4, no. 3: 873-879.
New calixarene-based nanosponges (CaNSs), i.e., hyper-reticulated polymers constituted by calixarene monomer units joined by means of bis(1,2,3-trialzolyl)alkyl linkers, were synthesized, characterized and subjected to preliminary tests to assess their supramolecular absorption abilities towards a set of suitable organic guests, selected as pollutant models. The synthesis was accomplished by means of a CuAAC reaction between a tetrakis(propargyloxy)calix[4]arene and an alkyl diazide. The formation of the polymeric network was assessed by means of FTIR and 13C{1H} CP-MAS solid-state NMR techniques, whereas morphological characterization was provided by SEM microghaphy. The materials were proved to possess pH-dependent sequestration abilities, due to the presence of the weakly basic triazole linkers. Sequestration efficiency indeed depends on the effective occurrence of both electrostatic and hydrophobic interactions between the guest and the polymer lattice. Thus, our CaNS nanosponges can be considered as a new class of purely synthetic smart absorbent materials.
Alberto Spinella; Marco Russo; Antonella Di Vincenzo; Delia Chillura Martino; Paolo Lo Meo. Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials. Beilstein Journal of Organic Chemistry 2018, 14, 1498 -1507.
AMA StyleAlberto Spinella, Marco Russo, Antonella Di Vincenzo, Delia Chillura Martino, Paolo Lo Meo. Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials. Beilstein Journal of Organic Chemistry. 2018; 14 (1):1498-1507.
Chicago/Turabian StyleAlberto Spinella; Marco Russo; Antonella Di Vincenzo; Delia Chillura Martino; Paolo Lo Meo. 2018. "Hyper-reticulated calixarene polymers: a new example of entirely synthetic nanosponge materials." Beilstein Journal of Organic Chemistry 14, no. 1: 1498-1507.
Cross-linked polyamine-based materials were easily prepared by reduction of the corresponding cross-linked imidazolium-based materials with sodium borohydride in hot ethanol. Overall, the synthetic procedure is based on the polymerization of the proper bis-vinylimidazolium salt with or without the presence of a suitable support, such as silica or silica coated magnetic nanoparticles (γ[email protected]), followed by reduction. This simple approach allows the synthesis of materials based on a network of secondary and tertiary amines. Materials were characterized by 13C Cross-Polarization Magic Angle Spinning NMR (13C CPMAS NMR), proton spin-lattice relaxation times in the rotating frame (T1ρH) and thermogravimetric analysis (TGA). Cross-linked polyamine-based materials were used as recoverable catalyst for Knoevenagel reaction. High yields of the condensation products were obtained and up to 11 cycles were carried out.
Vincenzo Campisciano; Anna Maria Pia Salvo; Leonarda Francesca Liotta; Alberto Spinella; Francesco Giacalone; Michelangelo Gruttadauria. Cross-Linked Polyamine from Imidazolium-Based Materials: A Simple Route to Useful Catalytic Materials. European Journal of Organic Chemistry 2018, 2018, 1352 -1358.
AMA StyleVincenzo Campisciano, Anna Maria Pia Salvo, Leonarda Francesca Liotta, Alberto Spinella, Francesco Giacalone, Michelangelo Gruttadauria. Cross-Linked Polyamine from Imidazolium-Based Materials: A Simple Route to Useful Catalytic Materials. European Journal of Organic Chemistry. 2018; 2018 (11):1352-1358.
Chicago/Turabian StyleVincenzo Campisciano; Anna Maria Pia Salvo; Leonarda Francesca Liotta; Alberto Spinella; Francesco Giacalone; Michelangelo Gruttadauria. 2018. "Cross-Linked Polyamine from Imidazolium-Based Materials: A Simple Route to Useful Catalytic Materials." European Journal of Organic Chemistry 2018, no. 11: 1352-1358.
Alberto Spinella; Marco Malagodi; Maria Luisa Saladino; Maduka L. Weththimuni; Eugenio Caponetti; Maurizio Licchelli. A step forward in disclosing the secret of stradivari's varnish by NMR spectroscopy. Journal of Polymer Science Part A: Polymer Chemistry 2017, 55, 3949 -3954.
AMA StyleAlberto Spinella, Marco Malagodi, Maria Luisa Saladino, Maduka L. Weththimuni, Eugenio Caponetti, Maurizio Licchelli. A step forward in disclosing the secret of stradivari's varnish by NMR spectroscopy. Journal of Polymer Science Part A: Polymer Chemistry. 2017; 55 (23):3949-3954.
Chicago/Turabian StyleAlberto Spinella; Marco Malagodi; Maria Luisa Saladino; Maduka L. Weththimuni; Eugenio Caponetti; Maurizio Licchelli. 2017. "A step forward in disclosing the secret of stradivari's varnish by NMR spectroscopy." Journal of Polymer Science Part A: Polymer Chemistry 55, no. 23: 3949-3954.
The investigation of artwork to understand story, state of conservation and to know about the composing materials\ud is an issue that is getting growing attention in specialized literature. Froma methodological point of view the\ud scientific community is trying to reach a common proposal that could contribute to define a Standard Operating\ud Procedure (SOP) for the application of portable non-invasive and microinvasive techniques for in-situ analyses.\ud In this paper the oil painting on canvas “St. Girolamo nello studio” by Nicolò Buttafoco was investigated to known\ud the materials and techniques used by the artist as well as to evaluate its preservation status. The survey has been\ud conducted by applying in situ non-destructive techniques. Depending on specific questions arising during the\ud survey, microsamples were taken and analyzed by micro-destructive techniques. The applied methodology to\ud the specific painting can be considered an application of best practices useful to define the SOP. The obtained information\ud were preparatory to the restoration work and have been used to plan and direct the relative choices
Maria Luisa Saladino; Stefano Ridolfi; Ilaria Carocci; Delia Chillura Martino; Renato Lombardo; Alberto Spinella; Giuseppe Traina; Eugenio Caponetti. A multi-analytical non-invasive and micro-invasive approach to canvas oil paintings. General considerations from a specific case. Microchemical Journal 2017, 133, 607 -613.
AMA StyleMaria Luisa Saladino, Stefano Ridolfi, Ilaria Carocci, Delia Chillura Martino, Renato Lombardo, Alberto Spinella, Giuseppe Traina, Eugenio Caponetti. A multi-analytical non-invasive and micro-invasive approach to canvas oil paintings. General considerations from a specific case. Microchemical Journal. 2017; 133 ():607-613.
Chicago/Turabian StyleMaria Luisa Saladino; Stefano Ridolfi; Ilaria Carocci; Delia Chillura Martino; Renato Lombardo; Alberto Spinella; Giuseppe Traina; Eugenio Caponetti. 2017. "A multi-analytical non-invasive and micro-invasive approach to canvas oil paintings. General considerations from a specific case." Microchemical Journal 133, no. : 607-613.
Epoxy resin/TiO2 nanocomposites prepared by both reactivesuspension method, based on in situ synthesis, and conventional mechanical mixing are analysed by solid-state nuclear magnetic resonance and transmission electron microscopy in order to have a deeper insight into the nature of interactions at the polymer/particle interface and their effect on the nanoparticles dispersion. Specifically, solid-state nuclear magnetic resonance experiments showed that the nanoparticles, synthesized by reactive suspension method, can efficiently link the matrix by hydrogen bonds forming a hybrid organic-inorganic 3D network. Such evidences strongly supports our previously reported theory, in which the nanoparticles in situ synthesized by reactive suspension method act not only as rigid filler, but also as actual cross-linking points, dramatically improving the mechanical properties of the polymeric matrix. Moreover, as revealed by transmission electron microscopy investigations, the formation of such hydrogen bonds significantly affect also the nanoparticles distribution, thanks to a stabilizing effect on the nanoparticles’ surface that prevents their aggregation and improves their dispersion.
Alberto Spinella; Federica Bondioli; Giorgio Nasillo; Vincenzo Renda; Eugenio Caponetti; Massimo Messori; Davide Morselli. Organic-inorganic nanocomposites prepared by reactive suspension method: investigation on filler/matrix interactions and their effect on the nanoparticles dispersion. Colloid and Polymer Science 2017, 295, 695 -701.
AMA StyleAlberto Spinella, Federica Bondioli, Giorgio Nasillo, Vincenzo Renda, Eugenio Caponetti, Massimo Messori, Davide Morselli. Organic-inorganic nanocomposites prepared by reactive suspension method: investigation on filler/matrix interactions and their effect on the nanoparticles dispersion. Colloid and Polymer Science. 2017; 295 (4):695-701.
Chicago/Turabian StyleAlberto Spinella; Federica Bondioli; Giorgio Nasillo; Vincenzo Renda; Eugenio Caponetti; Massimo Messori; Davide Morselli. 2017. "Organic-inorganic nanocomposites prepared by reactive suspension method: investigation on filler/matrix interactions and their effect on the nanoparticles dispersion." Colloid and Polymer Science 295, no. 4: 695-701.
Ce:YAG-poly(methyl methacrylate) (PMMA) composites were prepared by using a melt compounding method, adding several amounts of Ce:YAG in the range 0.1–5 wt. %. The optical properties of the obtained composites and of the composites combined with a blue LED were measured to investigate the effect of the amount of Ce:YAG on the resulting emitted light in view of possible application in white LED manufacture. An increase in Ce:YAG amount caused an increase in the emission and a shift of 15 nm, influencing the white LED performance. The structure and morphology of the composites were studied. The results show that the interaction between the two components, observed by using solid state NMR experiments, are the responsible for the observed shift.
Francesco Armetta; Motshabi A. Sibeko; Adriaan S. Luyt; Delia F. Chillura Martino; Alberto Spinella; Maria Luisa Saladino. Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED. Zeitschrift für Physikalische Chemie 2016, 230, 1219 -1231.
AMA StyleFrancesco Armetta, Motshabi A. Sibeko, Adriaan S. Luyt, Delia F. Chillura Martino, Alberto Spinella, Maria Luisa Saladino. Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED. Zeitschrift für Physikalische Chemie. 2016; 230 (9):1219-1231.
Chicago/Turabian StyleFrancesco Armetta; Motshabi A. Sibeko; Adriaan S. Luyt; Delia F. Chillura Martino; Alberto Spinella; Maria Luisa Saladino. 2016. "Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED." Zeitschrift für Physikalische Chemie 230, no. 9: 1219-1231.
Solid-state NMR spectroscopy was applied to characterize the wooden part of a roman Rostrum recovered in the Tyrrhenian Sea in the Acqualadroni area (Messina, Italy). The Acqualadroni Rostrum has been, in the recent past, investigated to establish its provenance and conservation. In this paper, solid-state NMR was used to obtain information on the conservation state of the wood as a preliminary step for the conservation process.A wooden sample of this artifact, collected by coring, was divided in four parts in order to correlate the conservation state to the depth. Results were compared with those obtained for a modern wood of the same species.A structural study was performed by acquiring 13C cross-polarization magic angle spinning spectra to evaluate the cellulose crystallinity degree and the lignin condensation degree. In addition, the holocellulose-lignin ratio and the cellulose-lignin residual interactions were determined through variable contact time experiments and relaxation times determination respectively.Being the solid-state NMR a non-destructive technique, all measurements were performed with no modification of the samples such as solvent extraction or other chemical treatment, making the samples available for further analytical investigation
Stella Bastone; Alberto Spinella; Delia Francesca Chillura Martino; Sebastiano Tusa; Eugenio Caponetti. More insight into characterization of the waterlogged wooden part of Acqualadroni Roman Rostrum by solid-state NMR. Microchemical Journal 2016, 124, 831 -836.
AMA StyleStella Bastone, Alberto Spinella, Delia Francesca Chillura Martino, Sebastiano Tusa, Eugenio Caponetti. More insight into characterization of the waterlogged wooden part of Acqualadroni Roman Rostrum by solid-state NMR. Microchemical Journal. 2016; 124 ():831-836.
Chicago/Turabian StyleStella Bastone; Alberto Spinella; Delia Francesca Chillura Martino; Sebastiano Tusa; Eugenio Caponetti. 2016. "More insight into characterization of the waterlogged wooden part of Acqualadroni Roman Rostrum by solid-state NMR." Microchemical Journal 124, no. : 831-836.
A class of inorganic binders, also known as geopolymers, can be obtained by alkali activation of aluminosilicate powders at room temperature. The process is affected by many parameters (curing time, curing temperature, relative humidity etc.) and leads to a resistant matrix usable for inertization of hazardous waste. In this study an industrial liquid waste containing a high amount of chromium (≈ 2.3 wt%) in the form of metalorganic salts is inertized into a metakaolin based geopolymer matrix. One of the innovative aspects is the exploitation of the water contained in the waste for the geopolymerization process. This avoided any drying treatment, a common step in the management of liquid hazardous waste. The evolution of the process--from the precursor dissolution to the final geopolymer matrix hardening--of different geopolymers containing a waste amount ranging from 3 to 20%wt and their capability to inertize chromium cations were studied by: i) the leaching tests, according to the EN 12,457 regulation, at different curing times (15, 28, 90 and 540 days) monitoring releases of chromium ions (Cr(III) and Cr(VI)) and the cations constituting the aluminosilicate matrix (Na, Si, Al); ii) the humidity variation for different curing times (15 and 540 days); iii) SEM characterization at different curing times (28 and 540 days); iv) the trend of the solution conductivity and pH during the leaching test; v) the characterization of the short-range ordering in terms of TOT bonds (where T is Al or Si) by (29)Si and (27)Al solid state magic-angle spinning nuclear magnetic resonance (ss MAS NMR) for geopolymers containing high amounts of waste (10-20%wt). The results show the formation of a stable matrix after only 15 days independently on the waste amount introduced; the longer curing times increase the matrices stabilities and their ability to immobilize chromium cations. The maximum amount of waste that can be inertized is around 10 wt% after a curing time of 28 days.
Chiara Ponzoni; Isabella Lancellotti; Luisa Barbieri; Alberto Spinella; Maria Luisa Saladino; Delia Chillura Martino; Eugenio Caponetti; Francesco Armetta; Cristina Leonelli. Chromium liquid waste inertization in an inorganic alkali activated matrix: Leaching and NMR multinuclear approach. Journal of Hazardous Materials 2015, 286, 474 -483.
AMA StyleChiara Ponzoni, Isabella Lancellotti, Luisa Barbieri, Alberto Spinella, Maria Luisa Saladino, Delia Chillura Martino, Eugenio Caponetti, Francesco Armetta, Cristina Leonelli. Chromium liquid waste inertization in an inorganic alkali activated matrix: Leaching and NMR multinuclear approach. Journal of Hazardous Materials. 2015; 286 ():474-483.
Chicago/Turabian StyleChiara Ponzoni; Isabella Lancellotti; Luisa Barbieri; Alberto Spinella; Maria Luisa Saladino; Delia Chillura Martino; Eugenio Caponetti; Francesco Armetta; Cristina Leonelli. 2015. "Chromium liquid waste inertization in an inorganic alkali activated matrix: Leaching and NMR multinuclear approach." Journal of Hazardous Materials 286, no. : 474-483.
In this work, a multi‐scale approach with different analytical methods is applied to study the curing process and the structural properties of a diglycidyl ether of bisphenol A (DGEBA) epoxy resin. This monomer, thermally cured using 4,4′‐diaminodiphenilsulfone (DDS) as hardener, is analyzed after 10, 45, 90, and 120 min of reaction time at 180 °C to obtain information on samples with different cross‐linking densities. Samples are also characterized after extraction in acetone in order to obtain structural information on the insoluble parts. For this purpose, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), solid‐state nuclear magnetic resonance (ss‐NMR), and positron annihilation lifetime spectroscopy (PALS) are employed. The importance of this multi‐method approach lies in the possibility to obtain a more complete knowledge of the investigated system, overcoming the limits inherent to the use of a single technique, through the correlation among results obtained from different structural investigation methodologies.
Sabina Alessi; Eugenio Caponetti; Olgun Güven; Meshude Akbulut; Giuseppe Spadaro; Alberto Spinella. Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation. Macromolecular Chemistry and Physics 2015, 216, 538 -546.
AMA StyleSabina Alessi, Eugenio Caponetti, Olgun Güven, Meshude Akbulut, Giuseppe Spadaro, Alberto Spinella. Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation. Macromolecular Chemistry and Physics. 2015; 216 (5):538-546.
Chicago/Turabian StyleSabina Alessi; Eugenio Caponetti; Olgun Güven; Meshude Akbulut; Giuseppe Spadaro; Alberto Spinella. 2015. "Study of the Curing Process of DGEBA Epoxy Resin Through Structural Investigation." Macromolecular Chemistry and Physics 216, no. 5: 538-546.
A series of new gemini surfactants without a spacer group, disodium 2,3-dialkyl-1,2,3,4-butanetetracarboxylates, were synthesized in a green chemistry context minimizing the use of organic solvents and applying microwaves (MW) when activation energy was required. Once the desired architecture was confirmed by means of the nuclear magnetic resonance technique (1H-NMR, 1H-1H COSY) for all the studied surfactants, the critical micellization concentration was determined by conductance measurements. The diffusion coefficient of micelles formed by the four compounds was characterized using pulsed field gradient (PFG)-NMR. Diffusion coefficients were found to be dependent on the concentration and on the number of carbon atoms in the alkyl chain. The absence of the spacer group, peculiar to this new series of gemini surfactants, may confer relatively low flexibility to the molecules, with potential implications on the interfacial properties, namely on micellization. These gemini surfactants might have interesting applications in the preparation of composite materials, in nanotechnology, in gene transfection and mainly, due to the low CMCs, as new interesting ingredients of cosmetics and toiletries.
Carla Villa; Sara Baldassari; Delia F. Chillura Martino; Alberto Spinella; Eugenio Caponetti. Green Synthesis, Molecular Characterization and Associative Behavior of Some Gemini Surfactants without a Spacer Group. Materials 2013, 6, 1506 -1519.
AMA StyleCarla Villa, Sara Baldassari, Delia F. Chillura Martino, Alberto Spinella, Eugenio Caponetti. Green Synthesis, Molecular Characterization and Associative Behavior of Some Gemini Surfactants without a Spacer Group. Materials. 2013; 6 (4):1506-1519.
Chicago/Turabian StyleCarla Villa; Sara Baldassari; Delia F. Chillura Martino; Alberto Spinella; Eugenio Caponetti. 2013. "Green Synthesis, Molecular Characterization and Associative Behavior of Some Gemini Surfactants without a Spacer Group." Materials 6, no. 4: 1506-1519.
Maria Antonietta Sabatino; Donatella Bulone; Miklós Veres; Alberto Spinella; Giuseppe Spadaro; Clelia Dispenza. Structure of e-beam sculptured poly(N-vinylpyrrolidone) networks across different length-scales, from macro to nano. Polymer 2013, 54, 54 -64.
AMA StyleMaria Antonietta Sabatino, Donatella Bulone, Miklós Veres, Alberto Spinella, Giuseppe Spadaro, Clelia Dispenza. Structure of e-beam sculptured poly(N-vinylpyrrolidone) networks across different length-scales, from macro to nano. Polymer. 2013; 54 (1):54-64.
Chicago/Turabian StyleMaria Antonietta Sabatino; Donatella Bulone; Miklós Veres; Alberto Spinella; Giuseppe Spadaro; Clelia Dispenza. 2013. "Structure of e-beam sculptured poly(N-vinylpyrrolidone) networks across different length-scales, from macro to nano." Polymer 54, no. 1: 54-64.
Soluble derivatives of multi-walled carbon nanotubes (MWNT) embedded in a poly(methylmethacrylate) (PMMA) matrix forming thick, homogeneous and transparent nanocomposites, were prepared and characterized. A new photo-assisted method using microwaves, to purify the MWNTs from amorphous carbon and synthesis catalyst clusters, was tested in a sulphonitric mix. This method shortened the processing time compared to other methods. Pristine and functionalized MWNTs were introduced into the MMA, then in situ photo-polymerized. Transmission electron microscopy (TEM) and X-ray diffractometry (XRD), as well as Fourier-transform infrared (FTIR), Raman and nuclear magnetic resonance (NMR) spectroscopy were used to monitor the effects of the treatment on the different components. The thermal properties of the composites were determined through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The short, microwave treated and polyethylene glycol (PEG) functionalized MWNTs showed the best dispersion in and interaction with PMMA, and had the most significant influence on the thermal properties of this polymer.
A. Zanotto; A.S. Luyt; Alberto Spinella; Eugenio Caponetti. Improvement of interaction in and properties of PMMA-MWNT nanocomposites through microwave assisted acid treatment of MWNT. European Polymer Journal 2012, 49, 61 -69.
AMA StyleA. Zanotto, A.S. Luyt, Alberto Spinella, Eugenio Caponetti. Improvement of interaction in and properties of PMMA-MWNT nanocomposites through microwave assisted acid treatment of MWNT. European Polymer Journal. 2012; 49 (1):61-69.
Chicago/Turabian StyleA. Zanotto; A.S. Luyt; Alberto Spinella; Eugenio Caponetti. 2012. "Improvement of interaction in and properties of PMMA-MWNT nanocomposites through microwave assisted acid treatment of MWNT." European Polymer Journal 49, no. 1: 61-69.