LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 7 of total 7

Search options

  1. Article ; Online: Low-Power and Eco-Friendly Temperature Sensor Based on Gelatin Nanocomposite

    Giovanni Landi / Veronica Granata / Roberto Germano / Sergio Pagano / Carlo Barone

    Nanomaterials, Vol 12, Iss 2227, p

    2022  Volume 2227

    Abstract: An environmentally-friendly temperature sensor has been fabricated by using a low-cost water-processable nanocomposite material based on gelatin and graphene. The temperature dependence of the electrochemical properties has been investigated by using ... ...

    Abstract An environmentally-friendly temperature sensor has been fabricated by using a low-cost water-processable nanocomposite material based on gelatin and graphene. The temperature dependence of the electrochemical properties has been investigated by using cyclic voltammetry, chronopotentiometry and impedance spectroscopy measurements. The simple symmetric device, composed of a sandwich structure between two metal foils and a printable graphene–gelatin blend, exhibits a dependence on the open-circuit voltage in a range between 260 and 310 K. Additionally, at subzero temperature, the device is able to detect the ice/frost formation. The thermally-induced phenomena occur at the electrode/gel interface with a bias current of a few tens of μA. The occurrence of dissociation reactions within the sensor causes limiting-current phenomena in the gelatin electrolyte. A detailed model describing the charge carrier accumulation, the faradaic charge transfer and diffusion processes within the device under the current-controlled has been proposed. In order to increase the cycle stability of the temperature sensor and reduce its voltage drift and offset of the output electrical signal, a driving circuit has been designed. The eco-friendly sensor shows a temperature sensitivity of about −19 mV/K, long-term stability, fast response and low-power consumption in the range of microwatts suitable for environmental monitoring for indoor applications.
    Keywords temperature sensor ; sustainability ; environmental monitoring ; gel polymer electrolyte ; gelatin ; graphene ; Chemistry ; QD1-999
    Subject code 620
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article ; Online: A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

    Giovanni Landi / Luca La Notte / Alessandro Lorenzo Palma / Andrea Sorrentino / Maria Grazia Maglione / Giovanni Puglisi

    Nanomaterials, Vol 12, Iss 46, p

    2022  Volume 46

    Abstract: Environmentally friendly energy storage devices have been fabricated by using functional materials obtained from completely renewable resources. Gelatin, chitosan, casein, guar gum and carboxymethyl cellulose have been investigated as sustainable and low- ...

    Abstract Environmentally friendly energy storage devices have been fabricated by using functional materials obtained from completely renewable resources. Gelatin, chitosan, casein, guar gum and carboxymethyl cellulose have been investigated as sustainable and low-cost binders within the electrode active material of water-processable symmetric carbon-based supercapacitors. Such binders are selected from natural-derived materials and industrial by-products to obtain economic and environmental benefits. The electrochemical properties of the devices based on the different binders are compared by using cyclic voltammetry, galvanostatic charge/discharge curves and impedance spectroscopy. The fabricated supercapacitors exhibit series resistance lower than a few ohms and values of the specific capacitance ranged between 30 F/g and 80 F/g. The most performant device can deliver ca. 3.6 Wh/kg of energy at a high power density of 3925 W/kg. Gelatin, casein and carboxymethyl cellulose-based devices have shown device stability up to 1000 cycles. Detailed analysis on the charge storage mechanisms (e.g., involving faradaic and non-faradaic processes) at the electrode/electrolyte interface reveals a pseudocapacitance behavior within the supercapacitors. A clear correlation between the electrochemical performances (e.g., cycle stability, capacitance retention, series resistance value, coulombic efficiency) ageing phenomena and charge storage mechanisms within the porous carbon-based electrode have been discussed.
    Keywords water processable ; sustainable binder ; gelatin ; carbon-based supercapacitor ; pseudocapacitive material ; charge storage mechanisms ; Chemistry ; QD1-999
    Subject code 620
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Impact of Acetate‐Based Hydrogel Electrolyte on Electrical Performance and Stability of Eco‐Friendly Supercapacitors

    Dr. Giovanni Landi / Dr. Luca La Notte / Dr. Veronica Granata / Dr. Guerino Avallone / Prof. Carlo Barone / Prof. Giovanni Carapella / Prof. Sergio Pagano / Dr. Alessandro Lorenzo Palma / Dr. Paolo Sdringola / Dr. Giovanni Puglisi

    ChemElectroChem, Vol 10, Iss 23, Pp n/a-n/a (2023)

    2023  

    Abstract: Abstract The electrochemical characteristics and stability of hydrogel‐based environmentally friendly supercapacitors employing sodium acetate as salt have been investigated. To ensure the overall sustainability of the devices, chitosan (a biomaterial ... ...

    Abstract Abstract The electrochemical characteristics and stability of hydrogel‐based environmentally friendly supercapacitors employing sodium acetate as salt have been investigated. To ensure the overall sustainability of the devices, chitosan (a biomaterial from renewable resources) and activated carbon (derived from coconut shells) have been used as a binder and filler within the electrodes, respectively. Cyclic voltammetry, galvanostatic charge/discharge, and impedance spectroscopy measurements have been performed to compare the electrochemical properties of the fabricated devices. Compared to reference electrolytes containing NaCl, the utilization of sodium acetate exhibited enhancements in energy performance and stability up to 50000 cycles. The most efficient device has been delivered approximately 10.6 Wh/kg of energy at a high‐power density of about 3940 W/kg. A comprehensive investigation of the electrochemical performances has been carried out, considering both faradaic and non‐faradaic processes as charge storage mechanisms within the devices. A model has been proposed to describe the storage mechanisms and to provide insights into the ageing phenomena observed during the cycling procedure.
    Keywords Charge storage mechanisms ; Cyclic voltammetry ; Gel-polymer electrolyte ; Sodium acetate ; Sustainable Chemistry ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
    Subject code 621
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Wiley-VCH
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  4. Article ; Online: Association between Older Age and Psychiatric Symptoms in a Population of Hospitalized Patients with COVID-19

    Maria Camilla Cipriani / Cristina Pais / Vezio Savoia / Cinzia Falsiroli / Andrea Bellieni / Antonella Cingolani / Massimo Fantoni / Daniela Pia Rosaria Chieffo / Gabriele Sani / Francesco Landi / Giovanni Landi / Rosa Liperoti

    Journal of Personalized Medicine, Vol 13, Iss 973, p

    2023  Volume 973

    Abstract: Increased rates of anxiety and depression have been reported for older adults during the COVID-19 pandemic. However, little is known regarding the onset of mental health morbidity during the acute phase of the disease and the role of age as potential ... ...

    Abstract Increased rates of anxiety and depression have been reported for older adults during the COVID-19 pandemic. However, little is known regarding the onset of mental health morbidity during the acute phase of the disease and the role of age as potential independent risk factor for psychiatric symptoms. The cross-sectional association between older age and psychiatric symptoms has been estimated in a sample of 130 patients hospitalized for COVID-19 during the first and second wave of the pandemic. Compared to younger patients, those who were 70 years of age or older resulted at a higher risk of psychiatric symptoms measured on the Brief Psychiatric Symptoms Rating Scale (BPRS) (adjusted (adj.) odds ratio (OR) 2.36, 95% confidence interval (CI) 1.05–5.30) and delirium (adj. OR 5.24, 95% CI 1.63–16.8)). No association was found between older age and depressive symptoms or anxiety. Age was associated with psychiatric symptoms independently of gender, marital status, history of psychiatric illness, severity of disease and cardiovascular morbidity. Older adults appear at high risk of developing psychiatric symptoms related to COVID-19 disease during hospital stay. Multidisciplinary preventive and therapeutic interventions should be implemented to reduce the risk of psychiatric morbidity and related adverse health care outcomes among older hospital inpatients with COVID-19.
    Keywords older adults ; COVID-19 ; psychiatric symptoms ; delirium ; hospitalization ; Medicine ; R
    Subject code 150
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article ; Online: Natural History of Scoliosis in Children with NF1

    Giuseppe Toro / Claudia Santoro / Daniele Ambrosio / Giovanni Landi / Martina Scilipoti / Antimo Moretti / Marco Paoletta / Sara Liguori / Alfredo Schiavone Panni / Stefania Picariello / Giovanni Iolascon

    Healthcare, Vol 9, Iss 881, p

    An Observation Study

    2021  Volume 881

    Abstract: 1) Background. Scoliosis is the most common musculoskeletal manifestation of Neurofibromatosis type 1 (NF1), and it might be dystrophic (D) or non-dystrophic (ND) depending on the presence of dysplastic changes of the spine. The aim of our study was to ... ...

    Abstract (1) Background. Scoliosis is the most common musculoskeletal manifestation of Neurofibromatosis type 1 (NF1), and it might be dystrophic (D) or non-dystrophic (ND) depending on the presence of dysplastic changes of the spine. The aim of our study was to describe the characteristics and natural history of patients with NF1 and scoliosis. (2) Methods. We retrospectively reviewed records from patients with NF1 and scoliosis. Scoliosis was classified as D if at least two dystrophic changes were documented at imaging. (3) Results. Of the 438 patients reviewed, 43 fulfilled inclusion criteria; 17 were classified in D group and 26 in ND. The groups did not differ in age and localization of scoliosis curvature. Surgery was needed more often in D group, but the between-group difference was not significant. Male-to-female ratios of 3:1 and 4:1 were reported in surgically treated NF1 patients with ND and D scoliosis, respectively. (4) Conclusions. Our data suggests independently by the presence of dysplastic changes affecting the spine that males with NF1 are more often affected by scoliosis that requires surgery.
    Keywords neurofibromatosis type 1 ; scoliosis ; treatment ; natural history ; dystrophic ; non-dystrophic ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2021-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  6. Article ; Online: Mitochondrial Signatures in Circulating Extracellular Vesicles of Older Adults with Parkinson’s Disease

    Anna Picca / Flora Guerra / Riccardo Calvani / Federico Marini / Alessandra Biancolillo / Giovanni Landi / Raffaella Beli / Francesco Landi / Roberto Bernabei / Anna Rita Bentivoglio / Maria Rita Lo Monaco / Cecilia Bucci / Emanuele Marzetti

    Journal of Clinical Medicine, Vol 9, Iss 2, p

    Results from the EXosomes in PArkiNson’s Disease (EXPAND) Study

    2020  Volume 504

    Abstract: Systemic inflammation and mitochondrial dysfunction are involved in neurodegeneration in Parkinson’s disease (PD). Extracellular vesicle (EV) trafficking may link inflammation and mitochondrial dysfunction. In the present study, circulating small EVs ( ... ...

    Abstract Systemic inflammation and mitochondrial dysfunction are involved in neurodegeneration in Parkinson’s disease (PD). Extracellular vesicle (EV) trafficking may link inflammation and mitochondrial dysfunction. In the present study, circulating small EVs (sEVs) from 16 older adults with PD and 12 non-PD controls were purified and characterized. A panel of serum inflammatory biomolecules was measured by multiplex immunoassay. Protein levels of three tetraspanins (CD9, CD63, and CD81) and selected mitochondrial markers (adenosine triphosphate 5A (ATP5A), mitochondrial cytochrome C oxidase subunit I (MTCOI), nicotinamide adenine dinucleotide reduced form (NADH):ubiquinone oxidoreductase subunit B8 (NDUFB8), NADH:ubiquinone oxidoreductase subunit S3 (NDUFS3), succinate dehydrogenase complex iron sulfur subunit B (SDHB), and ubiquinol-cytochrome C reductase core protein 2 (UQCRC2)) were quantified in purified sEVs by immunoblotting. Relative to controls, PD participants showed a greater amount of circulating sEVs. Levels of CD9 and CD63 were lower in the sEV fraction of PD participants, whereas those of CD81 were similar between groups. Lower levels of ATP5A, NDUFS3, and SDHB were detected in sEVs from PD participants. No signal was retrieved for UQCRC2, MTCOI, or NDUFB8 in either participant group. To identify a molecular signature in circulating sEVs in relationship to systemic inflammation, a low level-fused (multi-platform) partial least squares discriminant analysis was applied. The model correctly classified 94.2% ± 6.1% PD participants and 66.7% ± 5.4% controls, and identified seven biomolecules as relevant (CD9, NDUFS3, C-reactive protein, fibroblast growth factor 21, interleukin 9, macrophage inflammatory protein 1β, and tumor necrosis factor alpha). In conclusion, a mitochondrial signature was identified in circulating sEVs from older adults with PD, in association with a specific inflammatory profile. In-depth characterization of sEV trafficking may allow identifying new biomarkers for PD and possible targets ...
    Keywords aging ; biomarkers ; mitophagy ; mitochondrial dynamics ; mitochondrial quality control ; mitochondrial-derived vesicles ; exosomes ; mitochondrial-lysosomal axis ; Medicine ; R
    Subject code 610
    Language English
    Publishing date 2020-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Article ; Online: Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells

    Giovanni Landi / Heinz Christoph Neitzert / Carlo Barone / Costantino Mauro / Felix Lang / Steve Albrecht / Bernd Rech / Sergio Pagano

    Advanced Science, Vol 4, Iss 10, Pp n/a-n/a (2017)

    2017  

    Abstract: Abstract In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH3NH3PbI3‐based perovskite solar cells. ... ...

    Abstract Abstract In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH3NH3PbI3‐based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, and electron–phonon scattering, is formulated evidencing how the presence of shallow and deeper band tail states influences the solar cell recombination losses. At low temperatures, the observed cascade capture process indicates that the trapping of the charge carriers by shallow defects is phonon assisted directly followed by their recombination. By increasing the temperature, a phase modification of the CH3NH3PbI3 absorber layer occurs and for temperatures above the phase transition at about 160 K the capture of the charge carrier takes place in two steps. The electron is first captured by a shallow defect and then it can be either emitted or thermalize down to a deeper band tail state and recombines subsequently. This result reveals that in perovskite solar cells the recombination kinetics is strongly influenced by the electron–phonon interactions. A clear correlation between the morphological structure of the perovskite grains, the energy disorder of the defect states, and the device performance is demonstrated.
    Keywords electron–hole recombination ; electronic disorder ; electron–phonon interaction ; noise spectroscopy ; perovskite solar cells ; Science ; Q
    Subject code 530
    Language English
    Publishing date 2017-10-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top