Maria Penelope De Santo

Maria Penelope De Santo
Università della Calabria | Università della Calabria · Department of Physics

Ph.D.

About

132
Publications
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1,605
Citations
Additional affiliations
January 2010 - present
Radboud University
January 2004 - December 2012
Università della Calabria

Publications

Publications (132)
Article
Full-text available
Induced or spontaneous chirality in natural systems is an intriguing issue. In recent years, a lot of attention has been focused on chirality of chromonic liquid crystals, a class of materials that is able to self-assemble in columnar structures. However, the mechanism involved in the arising of chirality in these materials, that starts at the mole...
Article
Full-text available
We present an innovative approach allowing the identification, isolation, and molecular characterization of disease-related exosomes based on their different antigenic reactivities. The designed strategy could be immediately translated into any disease in which exosomes are involved. The identification of specific markers and their subsequent assoc...
Article
Potato starch-based films obtained by the tape-casting process for producing biodegradable food packages were studied. The stability of starch-in-water suspensions was preliminary investigated via the Turbiscan technique, as a function of the amount of starch, and the mixing regime adopted to suspend the system. The most stable samples, prepared wi...
Article
Full-text available
Innovative goods authentication strategies are of fundamental importance considering the increasing counterfeiting levels. Such a task has been effectively addressed with the so-called physical unclonable functions (PUFs), being physical properties of a system that characterize it univocally. PUFs are commonly implemented by exploiting naturally oc...
Article
Amongst emerging Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted a remarkable interest thanks to many possible applications. In particular, MoS2 has potentialities not yet fully realized in solution-based applications. However, the lack of knowledge of the optical properties of MoS2 has significantly limited its...
Article
Full-text available
The creation of partial or complete human epidermis represents a critical aspect and the major challenge of skin tissue engineering. This work was aimed at investigating the effect of nano- and micro-structured CHT membranes on human keratinocyte stratification and differentiation. To this end, nanoporous and microporous membranes of chitosan (CHT)...
Article
Full-text available
Over the years, the need for the synthesis of biodegradable materials has facilitated the drift of the asphalt industry towards eco-sustainable and cost-effective production of road pavements. The principal additives in the asphalt industry to improve the performance of road pavements and increase its lifespan are majorly rheological modifiers, adh...
Article
Full-text available
Chirality emergence in biological systems is common but the chiral expression from the molecular to macroscopic level in water‐based systems is poorly understood. Among water‐based systems, chromonic liquid crystals have recently received a lot of attention due to the spontaneous chirality they show when confined in curved geometries. Confinement o...
Conference Paper
Full-text available
In the field of Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted an outstanding interest due to it having several applications. MoS2 has potentialities not yet fully realized in solution-based applications. However, the lack of knowledge of the optical properties of MoS2, especially in the infrared range, has sign...
Conference Paper
Full-text available
Among emerging Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted a remarkable interest due to its many possible applications. In particular, MoS2 has potentialities not yet fully realized in solution-based applications. The morphological and the structural properties of MoS2 films deposited by spin-coating onto Si/...
Article
Full-text available
In the past three decades, several conventional methods have been employed for characterizing the bitumen ageing phenomenon, such as rheological testing, ultraviolet testing, gel permeation chromatography (GPC), gas chromatography (GC), atomic force microscopy (AFM), X-ray scattering, and Fourier transform infrared spectroscopy (FTIR). Nevertheless...
Article
In this work, for the first time, Polarclean® was used as eco-friendly sustainable solvent for preparing Polyethersulfone (PES) hollow fiber membranes via non-solvent induced phase separation (NIPS) technique. After a preliminary study on the dope solution viscosity, the hollow fibers were prepared by non-solvent induced phase separation (NIPS) tec...
Article
Full-text available
Nature has evolved several molecular strategies to ensure adhesion in aqueous environments, where artificial adhesives typically fail. One recently‐unveiled molecular design for wet‐resistant adhesion is the cohesive cross‐β structure characteristic of amyloids, complementing the well‐established surface‐binding strategy of mussel adhesive proteins...
Article
Ag(I)‐containing ethylcellulose (EC) films suitable as antbacterial packaging materials have been prepared and fully characterized. Different preparation methods, including the use of green casting solvents, are proposed. The Ag(I) acylpyrazolonato complexes, [Ag(Qpy,CF3)(L)], L=benzylimidazole (Bzim) and L=ethylimidazole (EtimH), used as active ad...
Article
The relationship, during physical aging, between the transport properties and Young’s modulus for films of polymers of intrinsic microporosity (PIM) was investigated using pure gas permeability and atomic force microscopy (AFM) in force spectroscopy mode. Excellent agreement of Young’s modulus measured for the archetypal PIM-1 with values obtained...
Article
Full-text available
In this work, we demonstrate micro resonators made of liquid crystal blue phase (BP) microspheres, embedded in a polymer/water matrix. The omnidirectional 3D lasing from BPII and BPI microspheres and the temperature-controlled laser tuning within the range of 55 nm from the BPI microspheres were observed for the first time. The potential applicatio...
Article
This manuscript describes the gas separation performance of PIM-2, a partially fluorinated linear copolymer synthesized from 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethylspirobisindane (TTSBI) and decafluorobiphenyl (DFBP). As one of the early members of the family of polymers of intrinsic microporosity, it had never been tested as a gas separation...
Article
Using a Surface Forces Apparatus and an Atomic Force Microscope, we characterized the adhesive properties of adsorbed layers of two recombinant variants of Perna Viridis foot protein 5 (PVFP-5), the main surface-binding protein in the adhesive plaque of the Asian green mussel. In one variant, all tyrosine residues were modified into 3,4-dihydroxy-L...
Poster
Full-text available
Light controlled molecular photoswitches with reversible luminescence modulation property are highly attractive because of their wide prospects in advanced photonic applications. Spiropyrans (SPs) represent an important class of photochromic molecules and have attracted considerable research interest for their versatile applications [1, 2]. Here we...
Conference Paper
In the intriguing field of active plasmonics, liquid crystals are considered a well-suited materials to be used as an active medium [1]. Recently, dual-frequency nematic liquid crystals (DFNLCs) pave the way for the so-called liquid-crystals plasmonics as a modulators since the material enables the tuning of plasmonic properties and behaves as an a...
Article
Keratin proteins extracted from wool fibers by sulfitolysis were electrospun for the production of active nanofiber membranes (NFMs). The keratin NFMs were composited with nylon woven fabric for improving their mechanical properties as a filtration material. The prepared membranes were characterized in terms of morphology, pore size, contact angle,...
Article
Full-text available
In the last decade, the possibility to use liquid crystal droplets as optical micro-cavities and lasers has attracted much attention since it paves the way for many applications in the field of sensors or tunable photonics. Several techniques can be used to obtain small micro-resonators as, for example, dispersing a cholesteric liquid crystal insid...
Article
Full-text available
Vesicle fusion is a fundamental cell biological process similar from yeasts to humans. For secretory vesicles, swelling is considered a step required for the expulsion of intravesicular content. Here this concept is revisited providing evidence that it may instead represent a general mechanism. We report the first example that non-secretory vesicle...
Article
Bitumens are composite materials whose complex organization hinders the rational understanding of their relationships between composition, structure and performances. So, research attempting to shed more light in this field is required. In this work Wide Angle X ray Scattering (WAXS) has been used to explore the influence of six opportunely chosen...
Article
Full-text available
With the rapid development of modern information technology, massive amounts of data are stored that require an information security. Here, we introduce a spiropyran doped polymer dispersed cholesteric liquid crystal film based rewritable medium that can produce high quality visual two-dimensional barcodes for anti-counterfeiting, authentication an...
Article
Tuning the rheological properties of bitumens is extremely important for applicative purposes. This can be achieved by the use of chemical additives tuning the asphaltene-asphaltene and asphaltene-maltene interactions. We propose the use of an epoxy-resin to give more rigid and thermally stable bitumens on the basis of its tendency to form polymeri...
Article
Despite intensive investigations in the UV (ultraviolet) and visible range, the research on the optical properties of graphene in the extended near and mid infrared range by means of Spectroscopic Ellipsometry (SE) remains limited yet. Herein, the optical properties of a Chemical Vapor Deposition (CVD)-grown monolayer graphene, transferred from a c...
Article
This paper presents Atomic Force Microscopy (AFM) as a powerful alternative to the more commonly used tensile tests for the analysis of the mechanical properties of polymeric membranes. The Young’s modulus measurements by the traditional tensile tests were compared with AFM operated in Force Spectroscopy mode. AFM measurements were carried out with...
Cover Page
Full-text available
We disclose a theranostic device for performing image‐guided riboflavin/UV‐A corneal cross‐linking. The device determines treatment efficacy by real time monitoring of riboflavin concentration in the corneal stroma. The study shows efficacy of the device in eye bank human donor tissues. Further details can be found in the article by Giuseppe Lombar...
Article
The growth of graphene on copper foil has been performed, following the well-known low-pressure chemical vapor (LP-CVD) procedure. The as-deposited monolayer graphene clearly exhibits two different coupling behaviors with the metal substrate, as demonstrated by visual microscopic investigation and by other experimental techniques, like Scanning Ele...
Article
Traces of CO in hydrogen rich gas streams poison the anode of proton exchange membrane fuel cells reducing their power output and decreasing the cell life. This paper investigates the CO selective oxidation in simulated reformate gas by using catalytic zeolite membranes. In particular, the CO removal efficiency was explored using catalytic membrane...
Article
In this paper, the role of solvent characteristics on the rheological and physicochemical properties of organogels was investigated using different techniques. Vegetable oils, such as rice, sunflower and castor oil were used as solvents, for producing organogels with monoglycerides of fatty acids or a mixture of fatty alcohols (policosanol) as gela...
Article
Full-text available
In the last decade, much interest has grown around the possibility to use liquid-crystal droplets as optical microcavities and lasers. In particular, 3D laser emission from dye-doped cholesteric liquid crystals confined inside microdroplets paves the way for many applications in the field of sensors or tunable photonics. Several techniques can be u...
Article
Full-text available
Bigels are two-phase systems in which each phase (organic or aqueous) is structured using a specific gelator. Currently, these systems are widely investigated, mainly as matrices for controlled drug delivery, because they possess the advantages of both organogels and hydrogels and are very stable owing to the structuration of the dispersing phase....
Article
In the last years the potential of combining the attractive materials characteristics of graphene related materials and silver nanostructures for SERS and metamaterials has emerged. Here, we report of graphene oxide thin films deposited by dip-coating on magnetron sputtered silver thin films. Our work represents a novelty in the field of the study...
Article
Full-text available
Due to the wide variation in geographic and climatic conditions, the search for high-performance bituminous materials is becoming more and more urgent to increase the useful life of pavements and reduce the enormous cost of road maintenance. Extensive research has been done by testing various bitumen modifiers, although most of them are petroleum-d...
Article
Microdroplets systems have attracted great interest because of their wide range of applications, easiness in processing and handling, feasibility in developing miniaturized devices with high performances and large flexibility. In this study, a stable emulsion based on different dye-doped chiral liquid crystals droplets has been engineered in order...
Article
Measuring temperatures at small scales, especially around nanoparticles, is a crucial step for a variety of applications in biomedicine and in optics. Here, we report on a novel method to map temperature in the medium surrounding silver nanoparticles dispersing them in a thermochromic mixture prepared using an organic dye and a polymer. When the na...
Article
Full-text available
PURPOSE. The purpose of this study was to investigate the biomechanical stiffening effect induced by nanoplatform-based transepithelial riboflavin/UV-A cross-linking protocol using atomic force microscopy (AFM). METHODS. Twelve eye bank donor human sclerocorneal tissues were investigated using a commercial atomic force microscope operated in force...
Conference Paper
Full-text available
In the last decade, gold and silver nanomaterials have received considerable attention due to their attractive electronic and chemical properties and their potential applications in the development of new technologies. Recent advances in the study of various gold and silver nanomaterials have led to their utilization in a number of very important a...
Article
Several phenolic compounds bind to proteins and show the ability to interfere with their aggregation process. The impact of the natural polyphenol resveratrol on the stability and heat induced aggregation of human serum albumin (HSA) was investigated by differential scanning calorimetry (DSC), attenuated total reflectance Fourier transform infrared...
Poster
Full-text available
In recent years, metallic nanoparticles dispersed in liquid crystals have attracted attention for the possible development of novel materials based on the controlled assembly of the particles. The use of dye doped cholesteric liquid crystals (DD-CLC) for mirror-less lasing is a well-established technology. In this work we demonstrate that light emi...
Poster
Full-text available
Here, we present for the first time a strategy to obtain multicolored lasing from cholesteric liquid crystals. In particular, we obtained two laser lines separated by 95nm. Also, one of the laser lines can be switched off if an electric field is applied to the first or the last cholesteric layer.
Article
Homogeneous thin films of controlled thickness obtained from cyclometallated complexes of general formula [(C^N)M(O^N)], where M= Pd(II) or Pt(II), H(C^N) = 2-phenylpyridine and, respectively, 2-thienylpyridine and H(O^N) = a triphenylamine functionalized Schiff base, have been deposited by oxidative electropolymerization. The films have been elect...
Article
Full-text available
The gold nanoparticle (GNP) aggregation growth induced by deoxyribonucleic acid (DNA) is studied by laser scanning confocal and environmental scanning electron microscopies. As in the investigated case the direct light scattering analysis is not suitable, we observe the behavior of the fluorescence produced by a dye and we detect the aggregation by...
Article
Full-text available
Rewritable optical storage has been obtained in a spiropyran doped liquid crystal polymer films. Pictures can be recorded on films upon irradiation with UV light passing through a grayscale mask and they can be rapidly erased using visible light. Films present improved photosensitivity and optical contrast, good resistance to photofatigue, and high...
Article
A new grade of ethylene-chlorotrifluoroethylene, low melting point HALAR® ECTFE (LMP ECTFE), was studied and used as a polymer for the preparation of solvent-resistant flat-sheet membranes. Among the different types of non-toxic solvents tested, di-ethyl adipate (DEA) was selected for preparing flat sheet membranes via thermally induced phase separ...
Article
Full-text available
Immunofluorescence is a biological technique that allows displaying the localization of the target molecule through a fluorescent microscope. We used a combination of gold nanoparticles and the fluorescein isothiocianate, FITC, as optical contrast agents for laser scanning confocal microscopy imaging to localize the endothelial-like nitric oxide sy...
Article
Full-text available
We report a method to obtain a light-controllable dichroism. The main effect is achieved using spiropyran-doped (SP-doped) nematic liquid crystal mixtures. SP molecules exhibit a high solubility in the liquid crystal host, which can vary between 1% and 4% in weight, without destroying the liquid crystalline phase. Due to their elongated shape, SP m...
Article
Full-text available
A new strategy to obtain multicolor lasing from cholesteric liquid crystals is presented. A four layer cell is prepared with three different cholesteric layers and a layer containing a photoluminescent dye. The three cholesteric mixtures are prepared so that their photonic band gaps are partially overlapped. Through this combination, two laser line...
Article
Full-text available
Advanced countries need simple, effective and affordable novel technical solutions for anti-counterfeiting, authentication, identification and traceability of goods for security, health, justice, logistics, and industry. Nanotechnologies, in particular soft materials and biomaterials, offer new possibilities of overt and covert layers for combating...
Article
Full-text available
To investigate the depth-dependent mechanical anisotropy of the human corneal stroma at the tissue (stroma) and molecular (collagen) level by using atomic force microscopy (AFM). Eleven human donor corneas were dissected at different stromal depths by using a microkeratome. Mechanical measurements were performed in 15% dextran on the surface of the...
Article
The energetics of amyloid fibrillar aggregation of β-lactoglobulin (βLG) following incubation at high temperature and acid pH was studied by differential scanning calorimetry in the presence of Cu2+ or Fe3+ cations, and without any metal. Cu2+ and metal-free protein solutions showed a distinct exothermic response that disappeared almost completely...
Article
Full-text available
Warm mix asphalt (WMA) is a promising technique that allows the production of asphalt at a noticeably lower temperature. One of the methods in use is to add small quantities of specific organic compounds to the asphalt conglomerate. Although it is well established that this procedure leads to an effective reduction of the temperature of asphalt con...
Article
Full-text available
To investigate the viscoelastic changes of the human cornea induced by riboflavin/UV-A cross-linking using Atomic Force Microscopy (AFM) at the nano level. Seven eye bank donor corneas were investigated, after gently removing the epithelium, using a commercial AFM in the force spectroscopy mode. Silicon cantilevers with tip radius of 10 nm and spri...
Article
Quinoxaline cavitands (QxCav) are transferred by Langmuir-Schaefer method on self-assembled monolayers (SAMs) of octadecyltrichlorosilane (OTS) and N,N-dimethyl- N-octadecyl-3-aminopropyltrimethoxysilyl chloride (DMOAP) on fused silica substrates. The molecular architectures of both the hydrophobic SAMs templates and the hybrid cavitand-organosilan...