ZnO nanodaļiņu iegūšana, īpašības un izmantošana

Mūsdienās liela uzmanība tiek pievērsta nanodaļiņu sintēzes pētījumiem. Tas ir saistīts ar to, ka, pārejot uz nanometru izmēriem, daļiņām parādās unikālas īpašības, kuras izmanto jauno, neparasto materiālu ražošanai

Application of Ultrasonic Imaging Technique as Structural Healt Monitoring Tool for Assessement of Defects in Glass Fiber Composite Structures

Structural Health Monitoring (SHM) is non-destructive testing technique which implements a damage detection and characterization strategy for engineering structures. It is widely applied for rapid condition screening with aim to provide reliable information regarding the integrity of composite structures. Key elements of system functionalities include detection of unanticipated structural damage events, damage location identification and characterization through images, monitoring damage growth and enabling feedback action/alarm mechanism. Fiberglass composite materials are becoming widely utilised in design of wind energy structures because of their performance in terms of high moduli, high corrosion and fatigue resistance, and low weight. Nevertheless the damage assessment by means of ply delamination causing stiffness and strength reduction is required by both industry and certification societies. In current research ultrasonic imaging technique is considered as the most efficient method employed for quality control and damage growth inspection by means of ultrasound B - and C - scans for visualization and direct estimation of the nature, structure and spatial distribution of the defects in GFRP structures. More than fifty impact caused damage GFRP samples with artificial damage have been produced for assessment study. A current research resulted in systemisation of damage and delamination identification means in glass fibre reinforced composite panels

Synthesis and Properties of ZnO/Al Thin Films Prepared by Dip-Coating Process

In this work sol–gel dip-coating technique was used to synthesize ZnO and ZnO/Al films. The influence of annealing regime and dopant concentration on the structural properties of ZnO and aluminum doped ZnO (ZnO/Al) films was investigated. The surface morphology and crystallinity of ZnO films were determined using atomic force microscopy and Xray diffraction, respectively. The experimental results show that ZnO and ZnO/Al films prepared using “shock” conditions have smooth surfaces and uniform grains. Increase of aluminum concentration led to grain size reduction and denser film

Synthesis of Nanoparticles by Redox Initiated Process and Preparation of Their Polymeric Nanocomposites

The ability of silver nanoparticles to interact efficiently with photons is of high interest in last years and also for obtaining the efficient and selected electrical and optical properties for application in the medicine and production of microelectronic and optical elements. However, zinc oxide is piezoelectric, transparent, semiconducting oxide with a wide direct band gap 3,37 eV and large excition binding energy of 60 meV.

Synthesis of Nanoparticles by Redox Initiated Process and Preparation of Their Polymeric Nanocomposites

The ability of silver nanoparticles to interact efficiently with photons is of high interest in last years and also for obtaining the efficient and selected electrical and optical properties for application in the medicine and production of microelectronic and optical elements. However, zinc oxide is piezoelectric, transparent, semiconducting oxide with a wide direct band gap 3,37 eV and large excition binding energy of 60 meV