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Ferrara, Liberato,Van Mullem, Tim,Alonso, Maria Cruz,Antonaci, Paola,Borg, Ruben Paul,Cuenca, Estefania,Jefferson, Anthony,Ng, Pui-Lam,Peled, Alva,Roig-Flores, Marta,Sanchez, Mercedes,Schroefl, Christ Elsevier 2018 Construction and Building Materials Vol.167 No.-
<P><B>Abstract</B></P> <P>Heuristically known at least since the first half of XIX century, the self-healing capacity of cement-based materials has been receiving keen attention from the civil engineering community worldwide in the last decade. As a matter of fact, stimulating and/or engineering the aforementioned functionality via tailored addition and technologies, in order to make it more reliable in an engineering perspective, has been regarded as a viable pathway to enhance the durability of reinforced concrete structures and contribute to increase their service life.</P> <P>Research activities have provided enlightening contributions to understanding the mechanisms of crack self-sealing and healing and have led to the blooming of a number of self-healing stimulating and engineering technologies, whose effectiveness has been soundly proved in the laboratory and, in a few cases, also scaled up to field applications, with ongoing performance monitoring. Nonetheless, the large variety of methodologies employed to assess the effectiveness of the developed self-healing technologies makes it necessary to provide a unified, if not standardized, framework for the validation and comparative evaluation of the same self-healing technologies as above. This is also instrumental to pave the way towards a consistent incorporation of self-healing concepts into structural design and life cycles analysis codified approaches, which can only promote the diffusion of feasible and reliable self-healing technologies into the construction market.</P> <P>In this framework the Working Group 2 of the COST Action CA 15202 “Self-healing as preventive repair of concrete structures – SARCOS” has undertaken the ambitious task reported in this paper. As a matter of fact this state of the art provides a comprehensive and critical review of the experimental methods and techniques, which have been employed to characterize and quantify the self-sealing and/or self-healing capacity of cement-based materials, as well as the effectiveness of the different self-sealing and/or self-healing engineering techniques, together with the methods for the analysis of the chemical composition and intrinsic nature of the self-healing products. The review will also address the correlation, which can be established between crack closure and the recovery of physical/mechanical properties, as measured by means of the different reviewed tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Review of test methods for assessing healing efficiency. </LI> <LI> Novel perspective in correlating healing to durability and mechanical recovery. </LI> <LI> Correlation between different test methods. </LI> <LI> Characterization methods of healing products. </LI> <LI> Pioneer monitored case studies are presented. </LI> </UL> </P>
M.da CT. Cavalcanti Liberato,Selene Maia de Morais,Sônia Maria Costa Siqueira,Jane Eire Silva Alencar de Menezes,Denise Nogueira Ramos,Lyeghyna Karla Andrade Machado,Islay Lima Magalha˜es 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.6
Twenty-three honey samples of Apis mellifera L. forged on plants from northeastern Brazil were analyzed to determine total phenolic content, flavonoid content, antioxidant activity, and antiacetylcholinesterase activity. The total phenol content was determined by using the Folin–Ciocalteu method, and the flavonoid content was analyzed using by the aluminum chloride method. The antioxidant activity was evaluated using the diphenyl-1-picrylhydrazyl–scavenging test. Honey samples from Lippia sidoides Cham. (mean [±standard deviation] 50% inhibitory concentration [IC_50], 4.20±1.07 mg/mL) and Myracrodruon urundeuva Fr. All. (IC_50, 28.27±1.41 mg/mL) showed better antioxidant activity and presented higher total phenol values (108.50±3.52 mg gallic acid equivalents/100 g for L. sidoides and 68.55±1.01 mg gallic acid equivalents/100 g for M. urundeuva). Several honey samples had relevant results on antiacetylcholinesterase assay. The biological activity of honeys is related to their floral origin, and medicinal plants constitute a useful resource for the generation of functional foods.
Prospects of Nanoscience with Nanocrystals
Kovalenko, Maksym V.,Manna, Liberato,Cabot, Andreu,Hens, Zeger,Talapin, Dmitri V.,Kagan, Cherie R.,Klimov, Victor I.,Rogach, Andrey L.,Reiss, Peter,Milliron, Delia J.,Guyot-Sionnnest, Philippe,Konstan American Chemical Society 2015 ACS NANO Vol.9 No.2
<P>Colloidal nanocrystals (NCs, <I>i.e.</I>, crystalline nanoparticles) have become an important class of materials with great potential for applications ranging from medicine to electronic and optoelectronic devices. Today’s strong research focus on NCs has been prompted by the tremendous progress in their synthesis. Impressively narrow size distributions of just a few percent, rational shape-engineering, compositional modulation, electronic doping, and tailored surface chemistries are now feasible for a broad range of inorganic compounds. The performance of inorganic NC-based photovoltaic and light-emitting devices has become competitive to other state-of-the-art materials. Semiconductor NCs hold unique promise for near- and mid-infrared technologies, where very few semiconductor materials are available. On a purely fundamental side, new insights into NC growth, chemical transformations, and self-organization can be gained from rapidly progressing <I>in situ</I> characterization and direct imaging techniques. New phenomena are constantly being discovered in the photophysics of NCs and in the electronic properties of NC solids. In this Nano Focus, we review the state of the art in research on colloidal NCs focusing on the most recent works published in the last 2 years.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-2/nn506223h/production/images/medium/nn-2014-06223h_0020.gif'></P>
Schembri, Emanuel,Massalha, Victoria,Spiteri, Karl,Camilleri, Liberato,Lungaro-Mifsud, Stephen The Korean Pain Society 2020 The Korean Journal of Pain Vol.33 No.4
Background: This study investigated whether current smoking and a higher nicotine dependency were associated with chronic low back pain (LBP), lumbar related leg pain (sciatica) and/or radicular neuropathic pain. Methods: A cross-sectional study was conducted on 150 patients (mean age, 60.1 ± 13.1 yr). Demographic data, the International Association for the Study of Pain (IASP) neuropathic pain grade, STarT Back tool, and the Fagerström test were completed. A control group (n = 50) was recruited. Results: There was a significant difference between current smokers and nonsmokers in the chronic LBP group in the mean pain score (P = 0.025), total STarT Back score (P = 0.015), worst pain location (P = 0.020), most distal pain radiation (P = 0.042), and in the IASP neuropathic pain grade (P = 0.026). There was a significant difference in the mean Fagerström score between the four IASP neuropathic pain grades (P = 0.005). Current smoking yielded an odds ratio (OR) of 3.071 (P = 0.011) for developing chronic LBP and sciatica, and an OR of 4.028 (P = 0.002) for obtaining an IASP "definite/probable" neuropathic pain grade, for both cohorts. The likelihood for chronic LBP and sciatica increased by 40.9% (P = 0.007), while the likelihood for an IASP neuropathic grade of "definite/probable" increased by 50.8% (P = 0.002), for both cohorts, for every one unit increase in the Fagerström score. Conclusions: A current smoking status and higher nicotine dependence increase the odds for chronic LBP, sciatica and radicular neuropathic pain.
Andre Luiz Ferreira Costa,Rubens Caliento,Glauber Bareia Liberato da Rocha,Joao Pedro Perez Gomes,Alison Jhisel Calle Mansmith,Claudio Froes de Freitas,Paulo Henrique Braz-Silva 대한영상치의학회 2017 Imaging Science in Dentistry Vol.47 No.4
Foreign body granulomas can develop after the injection of various cosmetic filling materials into the facial area to flatten wrinkles. Clinically, reactive lesions are easily mistaken for soft-tissue neoplasms or cysts. This report presents a case of foreign body granuloma in a 52-year-old female patient complaining of a painless swelling in the nasolabial region. Both clinical and histological features are described, underscoring the diagnostic role of magnetic resonance imaging findings.
Costa, Andre Luiz Ferreira,Caliento, Rubens,da Rocha, Glauber Bareia Liberato,Gomes, Joao Pedro Perez,Mansmith, Alison Jhisel Calle,de Freitas, Claudio Froes,Braz-Silva, Paulo Henrique Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.4
Foreign body granulomas can develop after the injection of various cosmetic filling materials into the facial area to flatten wrinkles. Clinically, reactive lesions are easily mistaken for soft-tissue neoplasms or cysts. This report presents a case of foreign body granuloma in a 52-year-old female patient complaining of a painless swelling in the nasolabial region. Both clinical and histological features are described, underscoring the diagnostic role of magnetic resonance imaging findings.
Park, Sungwook,An, Mai Ngoc,Almeida, Guilherme,Palazon, Francisco,Spirito, Davide,Krahne, Roman,Dang, Zhiya,De Trizio, Luca,Manna, Liberato The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.40
<P>We developed a facile synthesis of nanocomposite powders of CsPbX3 nanocrystals (NCs) embedded in silica. The synthesis starts from colloidal Cs4PbX6 NCs that are mixed with tetraethyl orthosilicate in the presence of nitric acid, which triggers the sol-gel reaction yielding the formation of SiOx and the conversion of starting NCs into CsPbX3 ones. The overall reaction delivers CsPbX3 NCs encased in a silica matrix. The resulting CsPbX3/SiOx nano-composite powders exhibited enhanced moisture and thermal stability in air. Also, when mixing different CsPbX3/SiOx samples having diverse anion compositions, no interparticle anion exchange processes were observed, which is a further indication that the silica matrix acts as a robust barrier surrounding the NCs. Finallly, we used these composites as down-converter phosphors on top of a blue light-emitting diode (LED), delivering nearly ideal white light emission with the Commission Internationale de l'Eclairage (CIE) color coordinates (0.32, 0.33).</P>
Akkerman, Quinten A.,Park, Sungwook,Radicchi, Eros,Nunzi, Francesca,Mosconi, Edoardo,De Angelis, Filippo,Brescia, Rosaria,Rastogi, Prachi,Prato, Mirko,Manna, Liberato American Chemical Society 2017 NANO LETTERS Vol.17 No.3
<P/><P>We have developed a colloidal synthesis of nearly monodisperse nanocrystals of pure Cs<SUB>4</SUB>PbX<SUB>6</SUB> (X = Cl, Br, I) and their mixed halide compositions with sizes ranging from 9 to 37 nm. The optical absorption spectra of these nanocrystals display a sharp, high energy peak due to transitions between states localized in individual PbX<SUB>6</SUB><SUP>4–</SUP> octahedra. These spectral features are insensitive to the size of the particles and in agreement with the features of the corresponding bulk materials. Samples with mixed halide composition exhibit absorption bands that are intermediate in spectral position between those of the pure halide compounds. Furthermore, the absorption bands of intermediate compositions broaden due to the different possible combinations of halide coordination around the Pb<SUP>2+</SUP> ions. Both observations are supportive of the fact that the [PbX<SUB>6</SUB>]<SUP>4–</SUP> octahedra are electronically decoupled in these systems. Because of the large band gap of Cs<SUB>4</SUB>PbX<SUB>6</SUB> (>3.2 eV), no excitonic emission in the visible range was observed. The Cs<SUB>4</SUB>PbBr<SUB>6</SUB> nanocrystals can be converted into green fluorescent CsPbBr<SUB>3</SUB> nanocrystals by their reaction with an excess of PbBr<SUB>2</SUB> with preservation of size and size distributions. The insertion of PbX<SUB>2</SUB> into Cs<SUB>4</SUB>PbX<SUB>6</SUB> provides a means of accessing CsPbX<SUB>3</SUB> nanocrystals in a wide variety of sizes, shapes, and compositions, an important aspect for the development of precisely tuned perovskite nanocrystal inks.</P>