A5024493593- biodegradable polymer synthesis and properties
- Organometallic Complex Synthesis and Catalysis
- Carbon dioxide utilization in catalysis
- Polymer crystallization and properties
- Advanced Photocatalysis Techniques
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- TiO2 Photocatalysis and Solar Cells
- Synthesis and properties of polymers
- Polymer Nanocomposites and Properties
- Membrane Separation and Gas Transport
- Advanced Polymer Synthesis and Characterization
- Aerogels and thermal insulation
- Mesoporous Materials and Catalysis
- Silicone and Siloxane Chemistry
- Organic Electronics and Photovoltaics
- Synthetic Organic Chemistry Methods
- Conducting polymers and applications
- Polyoxometalates: Synthesis and Applications
- Microplastics and Plastic Pollution
- Organic Light-Emitting Diodes Research
- Advanced Nanomaterials in Catalysis
- Catalytic Processes in Materials Science
- Crystallography and molecular interactions
- Covalent Organic Framework Applications
University of Salerno
2015-2024
National Interuniversity Consortium of Materials Science and Technology
2009-2023
National Research Council
2002-2006
Institute of Polymers, Composites and Biomaterials
2006
University of Naples Federico II
1990-2005
High-porosity syndiotactic polystyrene aerogels characterized by nanofibrils that give rise to a microporous crystalline δ-phase (see Figure) present high sorption capacity for volatile organic compounds at low concentrations, typical of the δ-phase, as well kinetics, aerogels. These properties make these new very promising industrial applications in chemical separations and water purification.
Abstract BACKGROUND Heterogeneous photocatalysis for the degradation of non‐biodegradable organic contaminants in wastewater is an alternative to traditional treatment techniques. Since applications developed employ photocatalysts powder form, a main disadvantage remains related recovery from treated wastewater, resulting damage and shorter lifetime recirculation pumps. Structured offer valid solution simplify process; however, they have guarantee light transmission, long‐term stability...
The beneficial effects on ZnO and TiO2 photocatalytic activity resulting from a suitable combination of doping heterojunctions were proposed investigated by synergistic experimental theoretical study. In detail, the ZnO/N-doped heterojunction was synthesized tested in degradation atrazine under UV visible light. Wide-angle X-ray diffraction (WAXD) analysis reveals presence both crystalline phases heterojunction. UV–vis DRS shows that simultaneous N-doped results slight increase band gap...
In this study, P-doped TiO2 photocatalysts with different molar percentages (in the range 0.071-1.25 mol %) of non-metallic element were prepared and their photocatalytic activity under visible light irradiation was tested. All achieved samples characterized by XRD, Raman, UV-Vis DRS SEM-EDX techniques. XRD Raman analysis showed that all doped in anatase phase evidenced P ions successfully incorporated into crystal lattice, affecting also crystallinity degree photocatalysts. Noticeably,...
The empty space in different crystalline and clathrate phases of syndiotactic polystyrene (s-PS) is evaluated by a numerical procedure. It shown that the δ form nanoporous includes two identical cavities per unit cell, whose shape volume are characterized. As consequence clathration, cell enlarged cavity able to include molecules definitely larger than its starting size. Sorption experiments nitrogen at 77 K for s-PS powders forms also presented. These can be interpreted inclusion three...
The crystal structure of the molecular complex syndiotactic polystyrene (s-PS) with bicyclo[2.2.1]hepta-2,5-diene (norbornadiene, NB) is presented. In analogy to already described s-PS complexes, this presents a monoclinic unit cell (cell constants = 17.5 Å, b 14.5 c 7.8 and γ 107.8°) in which s(2/1)2 polymer helices guest molecules are packed according space group P21/a. However, s-PS/NB layers contiguous alternated enantiomorphous hence can be as an intercalate phase. On other hand, all...
All lined up: C1-symmetric octahedral titanium complexes (see structure, Ti dark gray, N blue, O red, I purple) whose labile positions reside in different electronic environments were designed using the readily available salalen ligands. With methylalumoxane as co-catalyst, highly active catalysts obtained, which yielded high-molecular-weight polypropylene with ultra-high isotacticities 13C NMR spectrum) and melting transitions. Detailed facts of importance to specialist readers are...
Salalen aluminum complexes gave isotactic polylactides from <italic>rac</italic>-LA, heterotactic <italic>meso</italic>-LA and random copolymers of LA/CL. An experiment was designed to prove polymeryl exchange events.
Poly(lactic acid) (PLA) is a biodegradable polymer prepared by the catalyzed ring opening polymerization of lactide. An ideal catalyst should enable sequential lactide enantiomers to afford stereoblock copolymers with predetermined number and lengths blocks. We describe magnesium based that combines very high activity true-living nature, which gives access PLA materials unprecedented microstructures. Full consumption thousands equivalents L-LA within minutes gave PLLA expected molecular...
Abstract Enantiopure poly(lactic acid) (PLA) can form stereocomplexes when enantiomeric PLA chains are mixed in equivalent amounts. Such materials provide interesting features that might be suitable for numerous applications. Despite several advantages, the main drawback of is its narrow window processing, thus limiting use industrial Reported herein achiral iron complexes, highly active, productive, and stereoselective under mild reaction conditions ring‐opening polymerization lactide. The...
TiO2/biochar (C/TiO2)BM hybrid photocatalytic system is prepared, for the first time, by a cost-effective method (ball-milling procedure) and used removal of two organic dyes, labeled as Acid Blue 7 Red RTN, employed in tanning industry. The physicochemical properties are investigated different characterization methods, evidencing presence TiO2 anatase phase composite. performance evaluated degradation RTN UV light irradiation. results show similar efficiency (about 70 %) both dyes under at...
An inexpensive and reusable thermoplastic material that is promising in the field of chemical separations, particular water air purification from volatile organic compounds, presented. This semicrystalline based on syndiotactic polystyrene comprises a nanoporous crystalline phase where guest molecules can be clathrated. Changes conformational equilibria some chlorinated hydrocarbons upon clathration have been rationalized by molecular mechanics approach. sheds light nature host−guest...
The self-assembling of fluorescent guest molecules, with the δ nanoporous host crystalline phase syndiotactic polystyrene (s-PS) films, reduces chromophore diffusivity. Moreover, chromophore...
Chemical sensors are generally based on the integration of suitable sensitive layers and transducing mechanisms. Although inorganic porous materials can be effective, there is significant interest in use polymeric because their easy fabrication process, lower costs mechanical flexibility. However, absorbents amorphous hence present poor molecular selectivity undesired changes properties as a consequence large analyte uptake. In this contribution structure, some possible applications sensing...
Abstract A magnesium complex of the type {ONNN}Mg‐HMDS wherein {ONNN} is a sequential tetradentate monoanionic ligand introduced. In presence an alcohol initiator this catalyzes living and immortal homopolymerization lactide enantiomers ϵ‐caprolactone at room‐temperature with exceptionally high activities, as well precise block copolymerization these monomers in one‐pot synthesis by monomer addition. Copolymers unprecedented microstructures such PCL‐b‐PLLA‐b‐PDLA...
Phenol is an important chemical compound since it a precursor of the industrial production many materials and useful compounds. Nowadays, phenol industrially produced from benzene by multi-step “cumene process”, which energy consuming due to high temperature pressure. Moreover, in highly explosive cumene hydroperoxide as intermediate. To overcome these disadvantages, would be develop green alternatives for synthesis that are more efficient environmentally benign. In this regard, great...
In recent years, aromatic substances have become the focus of environmental pollution-related concern due to their high stability and mutagenicity. this regard, researchers focused attention on development photocatalytic processes convert nitroaromatic compounds into aniline. work, conversion nitrobenzene (NB) aniline (AN) was studied. The reaction performed using commercial TiO2 (P25) a aerogel, based P25 embedded in syndiotactic polystyrene (sPS) aerogel (sPS/P25 aerogel) as...
Guest desorption procedures for s-PS clathrate samples, leading to formation and regeneration of the nanoporous δ phase, are compared. An extraction procedure, based on supercritical carbon dioxide, allows an easy fast recovery guest molecules operating under relatively mild conditions (90–200 bar, 40°C) generates a completely empty form, also starting from most stable forms. In agreement with previously proposed crystal structure X-ray diffraction patterns form powders obtained by this...