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1. Nanocomposite-based stretchable optics

Author

Cristian Ghisleri, Mirko Siano, Marco A. C. Potenza, Paolo Milani, and Luca Ravagnan

Subjects
Fabrication, Nanocomposite, Materials science, business.industry, Optical power, Substrate (electronics), Conformable matrix, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Molding (decorative), Optics, Resilience (materials science), business, Beam (structure)
Abstract

Stretchable and conformable optical devices open up very exciting perspectives for the fabrication of systems incorporating diffracting and optical power in a single element. Supersonic cluster beam implantation of silver nanoparticles in an elastomeric substrate grooved by molding allows effective fabrication of cheap and simple stretchable optical elements able to withstand thousands of deformations and stretching cycles without any degradation of their optical properties. The nanocomposite-based reflective optical devices were characterized both morphologically and optically showing excellent performances and stability compared to similar devices fabricated with standard techniques. The nanocomposite-based devices can therefore be applied to arbitrary curved nonoptical grade surfaces in order to achieve optical power and to minimize aberrations like astigmatism. The high resilience of the nanocomposite material on which the devices are based allows them to be peeled and reused multiple times. more...

Published
2013
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2. Self-Healing Inside APbBr3 Halide Perovskite Crystals

Author

Yevgeny Rakita, Michael Elbaum, Davide Raffaele Ceratti, Llorenç Cremonesi, Dan Oron, Marco A. C. Potenza, Vyacheslav Kalchenko, Ron Tenne, David Cahen, Gary Hodes, Ceratti, D, Rakita, Y, Cremonesi, L, Tenne, R, Kalchenko, V, Elbaum, M, Oron, D, Potenza, M, Hodes, G, and Cahen, D more...

Subjects
Materials science, Photoluminescence, Mechanical Engineering, chemistry.chemical_element, Halide, halide perovskite, bleaching, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Photobleaching, 0104 chemical sciences, Formamidinium, chemistry, Mechanics of Materials, Chemical physics, Caesium, Phase (matter), self-healing, photoluminescence, General Materials Science, Thin film, 0210 nano-technology, Perovskite (structure)
Abstract

Self-healing, where a modification in some parameter is reversed with time without any external intervention, is one of the particularly interesting properties of halide perovskites. While there are a number of studies showing such self-healing in perovskites, they all are carried out on thin films, where the interface between the perovskite and another phase (including the ambient) is often a dominating and interfering factor in the process. Here, self-healing in perovskite (methylammonium, formamidinium, and cesium lead bromide (MAPbBr3 , FAPbBr3 , and CsPbBr3 )) single crystals is reported, using two-photon microscopy to create damage (photobleaching) ≈110 µm inside the crystals and to monitor the recovery of photoluminescence after the damage. Self-healing occurs in all three perovskites with FAPbBr3 the fastest (≈1 h) and CsPbBr3 the slowest (tens of hours) to recover. This behavior, different from surface-dominated stability trends, is typical of the bulk and is strongly dependent on the localization of degradation products not far from the site of the damage. The mechanism of self-healing is discussed with the possible participation of polybromide species. It provides a closed chemical cycle and does not necessarily involve defect or ion migration phenomena that are often proposed to explain reversible phenomena in halide perovskites. more...

Published
2018
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5. 18F-FDG PET-CT Scans in Oncology Patients Treated with Hyaluronic Acid Filler: Not Always a Pitfall.

Author

Proietti I, Battilotti C, Svara F, Tolino E, Bernardini N, Skroza N, Filippi L, and Potenza C

Abstract

The use of hyaluronic acid (HA) fillers in oncology patients undergoing PET-CT scans is a topic of debate due to potential interference with imaging accuracy. A 54-year-old female, postmelanoma metastasectomy in the parotid region with subsequent facial nerve palsy (FNP), received HA filler injections for facial symmetry and functional restoration. Follow-up PET-CT scans showed no interference or artifacts attributable to HA injection, allowing for accurate imaging results. This case suggests that HA fillers administered in oncology patients may not universally pose challenges or disrupt PET-CT imaging interpretation. Due to the possible false positives induced by fillers, the inclusion of aesthetic treatments in patients' anamnesis is a crucial step to accurately interpret PET-CT images. Although maintaining high level of caution in interpreting PET-CT results after filler injection is essential, our case emphasizes the safety of this procedure in oncology patients undergoing follow-up PET-CT scans., Competing Interests: All authors declare that they have no conflicts of interest., (Copyright © 2024 Ilaria Proietti et al.) more...

Published
2024
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6. A Review of the Literature of Surgical and Nonsurgical Treatments of Invasive Squamous Cells Carcinoma.

Author

Potenza C, Bernardini N, Balduzzi V, Losco L, Mambrin A, Marchesiello A, Tolino E, Zuber S, Skroza N, and Proietti I

Subjects
Female, Humans, Male, Carcinoma, Squamous Cell pathology, Carcinoma, Squamous Cell therapy, Skin Neoplasms pathology, Skin Neoplasms therapy
Abstract

Cutaneous squamous cell carcinoma (cSCC) is an increasing public health problem. It is a primary malignant skin tumor with Malpighian differentiation and together with basal cell carcinoma is classified among nonmelanoma skin cancers (NMSCs). cSCC usually occurs on photoexposed areas, such as the head, the neck, and the extremities, and its incidence increases with age. Invasive forms of this skin tumor tend to be more aggressive showing a higher metastatic potential, usually regarding regional lymph nodes. Treatment options for invasive cSCCs include both surgical and nonsurgical options. The therapeutic choice depends on several factors, such as anatomic location, risk factors for tumor recurrence, age, and health status of the patient. This review aims to provide an overview of the current evidence on therapeutic surgical and nonsurgical management of invasive cSCC. more...

Published
2018
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7. Correlations between psoriasis and inflammatory bowel diseases.

Author

Skroza N, Proietti I, Pampena R, La Viola G, Bernardini N, Nicolucci F, Tolino E, Zuber S, Soccodato V, and Potenza C

Subjects
Comorbidity, Humans, Models, Biological, Prevalence, Risk Factors, Statistics as Topic, Cytokines immunology, Inflammatory Bowel Diseases epidemiology, Inflammatory Bowel Diseases physiopathology, Intestines physiopathology, Psoriasis epidemiology, Psoriasis physiopathology, Skin physiopathology
Abstract

For a long time the relationship between inflammatory bowel diseases (IBDs) and psoriasis has been investigated by epidemiological studies. It is only starting from the 1990s that genetic and immunological aspects have been focused on. Psoriasis and IBD are strictly related inflammatory diseases. Skin and bowel represent, at the same time, barrier and connection between the inner and the outer sides of the body. The most important genetic correlations involve the chromosomal loci 6p22, 16q, 1p31, and 5q33 which map several genes involved in innate and adaptive immunity. The genetic background represents the substrate to the common immune processes involved in psoriasis and IBD. In the past, psoriasis and IBD were considered Th1-related disorders. Nowadays the role of new T cells populations has been highlighted. A key role is played by Th17 and T-regs cells as by the balance between these two cells types. New cytokines and T cells populations, as IL-17A, IL-22, and Th22 cells, could play an important pathogenetic role in psoriasis and IBD. The therapeutic overlaps further support the hypothesis of a common pathogenesis. more...

Published
2013
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