George Chi Tangyie

George Chi Tangyie
Loughborough University | Lough · Department of Materials

PhD Chemistry

About

23
Publications
3,551
Reads
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188
Citations
Citations since 2016
14 Research Items
158 Citations
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
Introduction
Additive manufacturing, metamaterials, ceramics processing, materials synthesis and characterisation, formulation, RF devices, microwave assisted processing, water and wastewater treatment, process control, reactor engineering.
Additional affiliations
January 2007 - present
De Montfort University

Publications

Publications (23)
Article
Additive manufacturing via direct ink writing and microwave dielectric characterisation of commercially produced low sintering temperature bismuth molybdenum oxide ceramics, have been both performed for the first time, following a powder-to-product holistic approach. We demonstrated that direct ink writing is an excellent candidate for producing di...
Article
Low sintering temperature, ultra-low loss microwave ceramics are envisaged as future dielectrics for fabricating low temperature co-fired ceramic (LTCC) components for 5G applications. Low sintering temperature bismuth molybdate β-Bi2Mo2O9 ceramic powders have been synthesised using a solid-state reaction method. Their additive manufacture and resu...
Article
Low sintering temperature, ultra-low loss microwave ceramics are envisaged as future dielectrics for fabricating low temperature co-fired ceramic (LTCC) components for 5G applications. Low sintering temperature bismuth molybdate β-Bi2Mo2O9 ceramic powders have been synthesised using a solid-state reaction method. Their additive manufacture and resu...
Article
Full-text available
Successful attempts to regenerate a used surface functionalised nanocoated polyacrylonitrile (PAN) catalyst are described here. During use in wastewater treatment, the novel Fenton catalyst (F1) is deactivated due to iron loss caused by acid hydrolysis. In this study the deactivated catalyst (D1) is subjected to reactions with 1-ethyl-3-(3-dimethyl...
Article
Full-text available
Additive manufacturing (AM) of co-fired low temperature ceramics offers a unique route for fabrication of novel 3D radio frequency (RF) and microwave communication components, embedded electronics and sensors. This paper describes the first-ever direct 3D printing of low temperature co-fired ceramics/floating electrode 3D structures. Slurry-based A...
Article
Full-text available
A new hydrogen bonded Cobalt(II) Schiff base complex, N'-(pyridine-4-carboxaldehyde) isonicotinoylhydrazone Cobalt(II), has been synthesized from isoniazid and pyridine-4-carboxaldehyde and characterized by IR spectroscopy, 1 H-NMR, elemental analysis, TGA and single crystal X-ray structure determination. X-ray crystal structure analysis shows an o...
Presentation
This project aims to investigate the feasibility of fabricating novel metamaterial structures from microwave dielectric ceramics using additive manufacturing techniques for high-frequency applications.
Conference Paper
Full-text available
This paper presents 3D printed low temperature sintered (< 700 °C) ceramic materials for microwave applications. The advantages of using cold sintered ceramics include better material compatibility with conductive elements in future multi-material additive manufacturing for microwave devices. Molybdate based ceramics have been synthesized and prepa...
Poster
Full-text available
Fabrication of complex ceramic components involves multiple steps, often is labour & energy-intensive. 3D printing of ceramics and their sintering through the application of external fields could pave the way for solving these issues. In this work, the combination of Additive Manufacturing (AM) along with Field Assisted Sintering Techniques (FAST)...
Poster
Full-text available
This research project will assess the feasibility of introducing novel metamaterials through the real integration of advanced manufacturing technologies and material sciences to produce complex structures with characteristics that are not generally offered by existing materials. This could offer a radically new way of designing and manufacturing el...
Article
One step aqueous melt-crystallization and in situ granulation was utilized to produce ibuprofen-cationic dextran [diethylaminoethyl dextran (Ddex)] conjugate crystanules without the use of surfactants or organic solvents. This study investigates the mechanism of in situ granulation-induced crystanule formation using ibuprofen (Ibu) and Ddex. Labora...
Conference Paper
Growing population and industrial activities mean that fresh and potable water resources are declining at an alarming rate with the generation of vast amounts of wastewater and subsequent release of contaminants in to water courses. Heterogeneous advanced oxidation processes constitute a promising technology for the treatment of wastewaters contain...
Article
Materials performance at microwave frequencies has generated a wide interest in recent years for commercial and industrial purposes. However, the interaction between microwave energy and iron compounds is an area where further characterization work is required. The article presents a novel optimized analytical-numerical method for conversion of smo...
Article
Full-text available
Legionnaires' disease is a severe form of pneumonia caused by Legionella spp., organisms often isolated from environmental sources, including soil and water. Legionella spp. are capable of replicating intracellularly within free-living protozoa, and once this has occurred, Legionella is particularly resistant to disinfectants. Citrus essential oil...
Article
The direct effect of intermolecular association between ibuprofen and diethylaminoethyl dextran (Ddex) and the novel 'melt-in situ granulation-crystallization' technique on the solubility, dose distribution, in vitro dissolution kinetics and pre-compression characteristics of the ibuprofen-Ddex conjugate crystanules have been investigated using var...
Article
Full-text available
The pollution of water sources by endocrine disrupting compounds (EDCs) and pharmaceutical and personal care products (PPCPs) is a growing concern, as conventional municipal wastewater treatment systems are not capable of completely removing these contaminants. A continuous stir tank reactor incorporating a modified polyacrylonitrile (PAN) catalyst...
Article
A kinetic model has been developed that expresses the oxidation of maleic acid in solution using a novel modified (polyacrylonitrile) PAN catalyst/hydrogen peroxide system. The novel modified PAN catalyst contains immobilised Fe3+ and its reaction with hydrogen peroxide is thought to generate reactive hydroxyl radicals according to Fenton's reactio...
Article
The effectiveness, kinetics and mechanism of oxidation of maleic acid in solution using a novel modified polyacrylonitrile (PAN) catalyst/hydrogen peroxide system was studied. The modified PAN catalyst contains immobilised Fe3+ and its reaction with hydrogen peroxide generates reactive hydroxyl radicals according to Fenton's reaction. The effects o...
Chapter
In the tourism industry, Cameroon has often sold itself as “Africa in miniature” because of its rich biocenoses representing almost all ecotones found in Africa including a very wide variety of landscape patterns. About 75 percent of the flora is still virgin. The fauna diversity includes rare carnivores, herbivores, primates and a diversity of bir...
Article
Full-text available
The Fenton oxidation process is one of the most widely used technologies in the oxidation of organic pollutants. The identification and quantification of end products of these oxidation processes is of prime importance due to environmental concerns of pollution and toxicity. In this work, we have developed a highly sensitive, cheap, easy and rapid...

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Projects

Projects (2)
Project
The purpose of this project is to investigate the feasibility of fabricating components from high dielectric permittivity and low loss ceramics that have low enough sintering temperature. The goal is further expanded towards obtaining 3D printed multi-material structures and components such as metallic inclusions inside the porous structure of dielectric ceramics