Search results for " NANO"

Measurement of Low Concentration of Nanosized Objects Suspended in a Liquid Medium

2018

The new optical scheme of refractometer with temperature stabilisation 10-2 °C is developed, which allows measuring a refractive index of the sample with accuracy not worse than 10-5; dependence of refraction index on concentration of SiO2 nanoparticles in liquid suspension is obtained within the framework of the research.

Nanokristāliskā itrija oksīda lokālās struktūras pētījumi

2017

Darbā tiek pētīta nanokristāliskā (2 – 50 nm) itrija (III) oksīda (Y2O3) lokālā struktūra, izmantojot dažādas eksperimentālās (rentgenstaru difrakcijas, Ramana spektroskopijas, caurejošās elektronu mikroskopijas, rentgenabsorbcijas spektroskopijas) un teorētiskās (klasiskās molekulārās dinamikas (CMD) un apgrieztās Monte-Karlo (RMC)) metodes. Rentgenabsorbcijas spektri, kas satur informāciju par materiāla lokālo struktūru, tika iegūti izmantojot sinhrotrono starojumu. Iegūtie spektri tika interpretēti, veicot teorētiskos aprēķinus uz superdatora. Darbā tiek analizēti materiālu lokālo struktūru raksturojošie lielumi atkarībā no nanodaļiņu izmēra. Salīdzinot CMD un RMC iegūtos rezultātus, tie…

Effect of multiple reprocessing cycles on the properties of polyethylene/Cloisite 15A nanocomposites

2012

Effect of reprocessing on polyamide/polyolefin based nanocomposites

2013

Restoration of a XVII Century’s predella reliquary: From Physico-Chemical Characterization to the Conservation Process

2021

We report on the restoration of a XVII century’s predella reliquary, which is a part of a larger setup that includes a wall reliquary and a wooden crucified Christ, both belonging to the church of “Madre Maria SS. Assunta”, in Polizzi Generosa, Sicily, Italy. The historical/artistic and paleographic research was flanked successfully by the scientific objective characterization of the materials. The scientific approach was relevant in the definition of the steps for the restoration of the artefact. The optical microscopy was used for the identification of the wood species. Electron microscopy and elemental mapping by energy-dispersive X-ray (EDX) was successful in the identification of the l…

Antifouling Mortars for Underwater Restoration

2022

This research has focused on the assessment of the compositional features and mechanical and antifouling performances of two different mortars formulated for an underwater setting, and which contain Mg(OH)2 as an antifouling agent. Regarding the mechanical characterization, the uniaxial compressive strength and flexural strength were measured. The composition of the materials was explored by differential thermal/thermogravimetric analysis (DTA-TG), X-ray diffraction analysis (XRPD), and scanning electronic microscopy (SEM) coupled with EDS microanalysis. The assessment of the biological colonization was evaluated with colorimetric analysis and image analysis. The results suggest that both m…

Physicochemical investigation of surfactant-coated gold nanoparticles synthesized in the confined space of dry reversed micelles

2006

Abstract Gold nanoparticle/surfactant composites have been synthesized by a novel reduction reaction in the confined space of dry sodium bis(2- ethylhexyl)sulfosuccinate (AOT) or lecithin reversed micelles dispersed in n-heptane and cyclohexane, respectively. The reaction was carried out by adding an opportune amount of anhydrous hydrazine/tetrahydrofuran solution to a suspension of HAuCl4-containing dry reversed micelles dispersed in organic solvent. UV–vis investigation ascertained the formation of stable metal gold nanoparticles and the analysis of FT-IR spectra highlighted the formation of an oriented surfactant monolayer at the nanoparticle surface. Simple evaporation under vacuum of t…

A model for the prediction of the flow curves from interlayer distance and vice versa for intercalated polymer and polymer blend nanocomposites

2015

In this work was proposed a simple model to predict the viscosity and the power law index from the interlayer distance and, vice versa, the interlayer distance from a single flow curve for intercalated polymer nanocomposites. This model cannot be applied to exfoliated nanocomposites or when other interactions are present in the systems.

The Influence of Nanoparticle Shape on Protein Corona Formation

2020

Nanoparticles have become an important utility in many areas of medical treatment such as targeted drug and treatment delivery as well as imaging and diagnostics. These advances require a complete understanding of nanoparticles' fate once placed in the body. Upon exposure to blood, proteins adsorb onto the nanoparticles surface and form a protein corona, which determines the particles' biological fate. This study reports on the protein corona formation from blood serum and plasma on spherical and rod‐shaped nanoparticles. These two types of mesoporous silica nanoparticles have identical chemistry, porosity, surface potential, and size in the y ‐dimension, one being a sphere and the other a …

Photoluminescent Detection of Human T-Lymphoblastic Cells by ZnO Nanorods.

2020

The precise detection of cancer cells currently remains a global challenge. One-dimensional (1D) semiconductor nanostructures (e.g., ZnO nanorods) have attracted attention due to their potential use in cancer biosensors. In the current study, it was demonstrated that the possibility of a photoluminescent detection of human leukemic T-cells by using a zinc oxide nanorods (ZnO NRs) platform. Monoclonal antibodies (MABs) anti-CD5 against a cluster of differentiation (CD) proteins on the pathologic cell surface have been used as a bioselective layer on the ZnO surface. The optimal concentration of the protein anti-CD5 to form an effective bioselective layer on the ZnO NRs surface was selected. …