147 research outputs found
PVA_H2SO4 Hydrogel for wearable devices
No full textIn recent years, wearable electronic sensing devices have attracted much attention because they can easily monitor human motion and physiological signals. The design of traditional wearable electronic devices mostly combines conductive materials with flexible substrates and provides for their placement on the body using an external aid like plasters and bands. The emergence and development of wearable devices have provided new directions for many fields, especially artificial intelligence systems and wearable healthcare devices. Currently, skin-attached wearable devices are widely expected because they adhere well to the skin and accurately enable health monitoring. However, wearable equipment, such as glasses or metal, is still limited to the conventional form. The key reason is that the critical devices cannot be flexible and stretchable so the device cannot be deformed and adhered well to the skin. Therefore, flexible, stretchable, and conductive materials are highly expected in wide applications. Gel-based materials exhibited excellent elongation, self-healing, and self-adhesive performance for various applications. As a result, the sample could be used for motion detection and signal transmission. Our research efforts are focused on the development of an alternative to traditional electronics that should be low-cost, bio-degradable, and made of environmentally nontoxic substances such as hydrogels. Hydrogels exhibit excellent flexibility and stretchability as promising candidates for preparing wearable devices, especially conductive hydrogels. We have investigated PVA_H2SO4 hydrogels and PVA_H2SO4/PANI-PAMPSA- PVA_H2SO4 double-layered hydrogels with different molecular weight as well as different amounts of PVA polymer as potential materials for energetic or sensors applications.
Reference:
Giovagnoli, A.; D’Altri, G.; Yeasmin, L.; Di Matteo, V.; Scurti, S.; Di Filippo, M.F.; Gualandi, I.; Cassani, M.C.; Caretti, D.; Panzavolta, S.; et al. Multi-Layer PVA-PANI Conductive Hydrogel for Symmetrical Supercapacitors: Preparation and Characterization. Gels 2024, 10, 458. https://doi.org/10.3390/gels10070458
Giada D’Altri, Lamyea Yeasmin, Valentina Di Matteo, Stefano Scurti, Angelica Giovagnoli, Maria Francesca Di Filippo, Isacco Gualandi, Maria Cristina Cassani, Daniele Caretti, Silvia Panzavolta, Erika Scavetta, Mariangela Rea, and Barbara Ballarin,ACS Omega 2024 9 (6), 6391-6402. DOI: 10.1021/acsomega.3c0539
Assessment of the health status in the Massa Lombarda cohort: a preliminary description of the program evaluating cardio-cerebro-vascular disease risk factors and quality of life in an elderly population.
No full textThe Massa Lombarda program (MLP) is the first step of a European multi-center program, promoted and coordinated from Bologna University's Academic Spin off Health Research and Development, which attempts to manage advanced sanitary research in general population. The instant individual definition (IID) study is the first phase of the program concerning the study of risk factors (RF) and early diagnosis of coronary heart disease (CHD), through a new diagnostic technology called myocardial perfusion scoring system (MPS). The study consists
of a longitudinal observational epidemiological investigation of adult population (above 25 years of age) resident in Massa Lombarda (Ravenna), with the survey of social and biological parameters. The elderly part of the population (1000 subjects above 75 years) was submitted to a more complex analysis, as part of the
study on health status in European aging populations, aimed at revealing the determinants influencing the healthy aging, and at identifying their impact on mortality,cardiovascular and respiratory morbidity, disability and decline of quality of life. Laboratory analyses were aimed at identifying the following factors: (i) Genetic markers related to pro and anti-inflammatory cytokine- codifying genes. (ii) Oxidative stress-involved molecules, and inflammation-involved genes, and more in general genes involved in the brittleness(iii) (ApoE). Appraising the degree of interaction with non-genetic factors, like measurable immunological markers in the peripheral blood, markers
of reactions to oxidative stress,evaluation of metabolic parameters. Moreover, old population is expected to answer the questionnaires for evaluation of the dietary habits, physical activity, self-sufficiency,cognitive ability, motor coordination, perceived stress and social relationships
Prospective, multicenter, observational analysis of 5-HT3 receptor antagonist antiemetic prescribing with different chemotherapy regiments
No full textCriogel polimerico macroporoso a base di N-alchil-D-glucammina per trattenere e/o rimuovere contaminanti tossici
No full textThe present invention refers to the field of chemistry and in particular to a N-alkyl-D-glucamine based macroporous polymeric cryogel, the method for the preparation thereof and its use for sequestering and/or removing toxic contaminants such as metalloids and/or toxic heavy metals, for example from water and/or soil
Electromechanical modeling of Nb3Sn superconducting wires subjected to periodic bending strain
No full textThe transport performance of Nb3 Sn cable-in- conduit conductors (CICCs) depends on the strain distribution along the superconducting filaments determined by the combi- nation of electromagnetic and mechanical forces applied to the strands. Experimental studies on the effect of bending strain were performed at the University of Twente by means of the Test Arrangement for Strain Influence on Strands (TARSIS) facility. The aim of this paper is to verify the agreement between a detailed electromechanical model of the wire and the experimental results obtained in TARSIS. A numerical model of two Nb3Sn internal tin strands was developed, which describes the wire through a distributed parameter nonlinear electrical circuit. The model re- quires a single strand to be discretized into a number of elements, connected by transverse conductances and subjected to a given strain distribution. The strain distribution maps were computed at the École Centrale Paris by means of the MULTIFIL code at different experimental conditions in the TARSIS facility. The simulation results show good agreement with the experimental ones in terms of both critical current and n-value degradation
A randomized, double-blind clinical trial on the long term efficacy of psyllium husk vs. guar gum on the clinical features of metabolic syndrome
No full text
Implementation of polyaniline in biocompatible supports for sensing and energy storage
No full textConductive polymers represent an affordable and reliable answer to the stiffness of conventional electronics. Polyaniline (PANI) in particular shows a peculiar doping/dedoping process, with high conductivity and exceptional tuneability. On the other hand, this material is fragile and not flexible. Different supports can enhance the mechanical properties of PANI, donating resilience, tenacity, and flexibility. This contribution would like to study the composite material based on PANI and paper or hydrogel and to report the fabrication of two different biocompatible devices, respectively a paper-like sensor for humidity1 and an all-in-one supercapacitor (SC)2. PANI was polymerized with poly (2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPSA) for a more mechanically stable structure. With the addition of PAMPSA, the emeraldine state of PANI is achieved, providing enhanced conductivity. For the fabrication of conductive paper, the polymerization was conducted in situ on cellulose fibres, which were then dried and consequently pressed. Humidity sensors were fabricated by cutting the obtained sheets in rectangles. Due to humidity (RH%), cellulose/PANI-PAMPSA conductivity increases and the considered analytical signal is the measured current flow through the material by applying a constant voltage. Another interesting application is in the medical field, as a breath or ECG sensor. We then investigated the insertion of PANI-PAMPSA in polyvinyl alcohol (PVA) hydrogel systems. PVA powder was dissolved in PANI-PAMPSA solution, inducing a physical crosslinking through freeze-thaw cycles and providing a self-healing ability to the SC. Since PANI-based hydrogel partially functions as an electrode, the need of an electrolyte is covered by PVA-H2SO4 hydrogel, with a high adhesion between the layers. The resulting structure composes the all-in-one supercapacitor.
References:
[1] Ragazzini, I.; Gualandi, I.; D’Altri, G.; Di Matteo, V.; Yeasmin, L.; Cassani, M. C.; Scavetta, E.; Bernardi, E.; Ballarin, B., Carbohydr Polym 2023, 316, 121079.
[2] D’Altri, G.; Yeasmin, L.; Di Matteo, V.; Scurti, S.; Giovagnoli, A.; Di Filippo, M. F.; Gualandi, I.; Cassani, M. C.; Caretti, D.; Panzavolta, S.; Scavetta, E.; Rea, M.; Ballarin, B., ACS Omega 2024, 6391-6402
N-methyl-D-glucamine based cryogels as reusable sponges to enhance heavy metals removal from water
No full textThe design of novel cryogels containing N‐methyl‐D‐glucamine (NMG) group was herein reported. The macroporous materials were prepared via sustainable and feasible cryopolymerization by using as co-monomers (4‐vinyl-benzyl)‐N‐methyl‐D‐glucamine (VbNMG) and 2-hydroxyethyl methacrylate (HEMA) at different percentages. Particularly, cryogel containing 100% of VbNMG (VbNMG-100) showed excellent ability in fast water uptake, removing arsenic (V) and chromium (VI) metal ions from it. Reusability up to six cycles was also demonstrated. The as-prepared materials were characterized by spectroscopic, thermal, and morphological analyses. The effect of initial oxyanions concentration, kinetic profiles, interfering anions (phosphate and sulphate) were investigated and adsorption/desorption studies were carried out. Equilibrium sorption results well fitted the Langmuir isotherm for both ions tested, showing a startling aptitude in arsenic (76.3 mg/g) as well as chromium (130.9 mg/g) sorption properties if compared with similar polymers as well as other materials. Exploiting its spongy nature, only 5 mins were needed to absorb contaminated medium releasing purified water by a simple squeezing. Most importantly, the sponge can be easily regenerated and reused again up to three times without the depletion of its efficiency
- …
