Day :
- Nano Materials Synthesis and Characterisation
Location: Webinar
Session Introduction
Shweta Meena
National Institute of Technology, India
Title: Study of effect of functionalization of black phosphorene on its spin-transport and magnetic properties
Biography:
Shweta Meena has completed her PhD at the age of 30 years from National Institute of Technology, Kurukshetra, India. She is working as Assistant Professor in Department of Electronics & Communication Engg, National Institute of Technology, Kurukshetra, India. She has published papers in reputed journals and in international conferences.
Abstract:
First-principles spin-polarized density functional theory investigations are reported to understand the effect of functionalization (vanadium and titanium) on tunelling magnetoresistance (TMR) and spin-polarized transport of black phosphorene (
) nanosheet based magnetic tunnel junction (MTJ) with CrO2 as electrodes. The results show, vanadium adsorbed black phosphorene based structure exhibits better spin filtration and high TMR, as compared to titanium adsorbed black phosphorene and pristine black phosphorene based structures. In addition, vanadium adsorbed black phosphorene nanosheet exhibits ferromagnetic behaviour with a magnetic moment of 
. The magnetic moment for pristine black phosphorene and titanium adsorbed black phosphorene nanosheets are reported to be 
and 
, respectively. Higher TMR, better spin filtration and ferromagnetic behaviour for vanadium adsorbed black phosphorene based structure opens up its possibility as spin filter (injector) in MTJs and other spin-based devices.
Gabriela Moron
Cayetano Heredia Peruvian University, Peru
Title: Antifungal Activity of Loaded Chitosan Nanoparticles with S-nitrosomercaptosuccinic acid against Candida sp.
Biography:
Gabriela Morón is a Pharmaceutical Chemistry graduated from the Faculty of Science of the Cayetano Heredia Peruvian University. He has won the Prize for Innovation in Pharmaceutical Technology awarded by the Association of National Pharmaceutical Industries from 2015 to 2016. Currently, he works in the Cosmetic Industry as Technical Director and is pursuing a specialization in Lean Six Sigma Black Belt by the University of the Pacific.
Abstract:
Introduction: Candida sp species are fungal pathogens that affect patients with risk pathologies. Due to the change in their conventional drug susceptibility patterns, it is necessary to investigate therapeutic alternatives. It is proposed to evaluate the antifungal potential of nitric oxide (NO), by administering it in the donor s-nitrosomercaptosuccinic acid (MSA-NO), encapsulated in chitosan nanoparticles (Np) to improve its bioavailability and inhibit the growth of Candida albicans, glabrata, krusei and parapsilosis.
Methods: Three batches of nanoparticles loaded with mercaptosuccinic acid (MSA-Np) were synthesized by ionic gelation. The effective particle diameter and polydispersity index were analyzed by dynamic light scattering and encapsulation efficiency by the Ellman reaction. After adding NaNO2, MSA-NO Np. The minimum inhibitory concentration (MIC) against species of Candida sp. iwas determined by microdilution and the NO release profile was estimated by UV spectrophotometry.
Results: The MSA Np presented optimal values of effective particle diameter (241.69 ± 18.95 nm), polydispersity index (0.274 ± 0.015) and encapsulation efficiency (97.52 ± 0.07%). The MIC values of C. glabrata and C. albicans were 0.28 mg / mL and 2.25 mg / mL, respectively. The lowest CMI corresponded to C. krusei while C. albicans was the least susceptible to NO. The results did not vary significantly batch to batch.
Conclusions: A procedure of synthesis of MSA-NO Np with antifungal activity on Candida sp was validated. The antifungal potency varied according to the species. The chitosan of MSA-NO Np was useful as a polymer matrix for NO controlled release.
Y. Vicente-MartÃnez
University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT
Title: Nanomaterials for adsorption of contaminants in water
Biography:
Dr. Yesica Vicente Martínez obtained her doctorate in chemistry at the University of Murcia (Spain) in 2014. During her research career she has worked on the development of nanotechnology-based analysis techniques for contaminants that are in trace concentrations. At present she has founded the research group Physico-chemical of the environment together with doctors in physics Manuel Caravaca and Antonio Soto Meca. Focusing their research work on the adsorption of contaminants through the use of nanoparticles.
Abstract:
Currently, methods of water disinfection, decontamination and desalination can mitigate some of the problems related to water pollution. These treatment methods are generally chemically and energy intensive, so heavy investments are required. In addition, they are not able to eliminate the presence of some pollutants which are in very small concentrations, but that even at these levels involve a risk to society, such as drugs, detergents or heavy metals. Nanotechnology is the potential solution for long-term water forecasting with techniques such as filtration, the use of nanoparticles in catalysis and desalination. Moreover, with the development of nanotechnology, conventional techniques used in water treatment such as adsorption, flocculation and coagulation can be enhanced. Pharmaceuticals are products used in large doses in daily life considered as contaminants of emerging concern. Due to the large amounts of drugs consumed, the hydrogenic sources suffer from contamination processes that give rise to toxicological effects in humans despite its low concentrations. Many medicines considered as emerging contaminants are constantly detected in groundwater, wastewater treatment plants and water supply. The inefficiency of conventional methods used in water treatment plants to remove the contaminant motivates the development of effective methods to treat effluent contamination. Nanoparticles have been employed in recent studies to remove emerging pollutants from different media due to its very small size and high contact surface, thus achieving a high adsorption efficiency. Heavy metals present in water are also easily removed by emulating nanostructured adsorbents.
Fernando Gimeno-Bellver
University Center of Defence, Spain
Title: Effectiveness in the absorption of X-rays by composite materials doped with graphene
Biography:
Fernando Gimeno-Bellver has been a full-time lecturer for 10 years at the university's defense center and has published more than 15 articles in journals related to functional materials and technology.
Abstract:
In the University Center of Defense in San Javier, composite sheets based on carbon fiber and epoxy matrix have been prepared, with some of them doped with graphene oxide or with 0.1% graphite from Sigma-Aldritch and manufatured by us.
These sheets were then irradiated with X-rays in the radiodiagnosis service of the Mesa del Castillo Hospital, Murcia, Spain. Radiation absorption measures via image analysis were performed and it has been shown that graphene-doped sheets absorb an important part of the X-ray intensity over a wide range of energy. These experiments were repeated over various ranges of frequency and energy with similar results.