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3. Phosphate based glass in developing anti-scale devices with antimicrobial properties

Author

Baek, Song Yi

Abstract

Previous study allowed us to focus on the most effective anti scaling glass composition of 50P2O5 ∙10Na2O ∙ 40CaO (mol%) showing the best anti scaling property with the controlled release of the desired P3O93- and P3O105- phosphates. Achieving anti scaling properties with an increase of more than 1000% in humidifier running time using hard water (ca. 320 ppm), previously broken due to scale formation within 2 months. Primary studies carried out was glass dissolution, where tap and deionized water was used to observe dissolution and ion release in water with presence and absence of ions. Followed by dynamic and static tests to understand how the flow of liquid will effect dissolution and ion release. Extreme temperature and humidity experiments were carried out to test the glass' durability trying to understand how the condition in which the glasses are kept will affect its overall performance. Glass and its following results were characterized with thermal gravitational analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive x-ray (EDX), x-ray photoelectron spectroscopy (XPS) and 31P nuclear magnetic resonance (NMR) with dissolution properties analysed using ion chromatography, inductively coupled plasma-optical emission spectroscopy (ICP-OES). The glass chosen by this thesis showed great durability in extreme temperatures and humidity. Finally, extending on its controlled ion release and anti scaling property; the addition of copper showed antimicrobial property with 50P2O5 ∙10Na2O ∙20CaO ∙20CuO (mol%) showing best performance. Addition of copper decreased P3O93- and increased P3O105- phosphate release showing change in glass bulk structure with addition of Cu2+, making the glass more ideal as it allows for the glass not to excessively release phosphates whilst achieving antimicrobial property. The glass was also pulled into fibres with its possible application into cooperation into filters also showing excellent antimicrobial property. In conclusion, the glasses studied exhibited steady release of anti scaling phosphates in all conditions making it an excellent candidate for industrial uses in all hard water environments with effective antibacterial and antiviral property.

Published
2022

16. Antibacterial Copper-Doped Calcium Phosphate Glasses for Bone Tissue Regeneration

Author

Foroutan, Farzad, primary, McGuire, Jamie, additional, Gupta, Priyanka, additional, Nikolaou, Athanasios, additional, Kyffin, Benjamin A., additional, Kelly, Nicole L., additional, Hanna, John V., additional, Gutierrez-Merino, Jorge, additional, Knowles, Jonathan C., additional, Baek, Song-Yi, additional, Velliou, Eirini, additional, and Carta, Daniela, additional

Published
2019
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17. A reversible fluorescent probe for monitoring Ag(I) ions

Author

Lim, Zelong, Smith, David G., Kolanowski, Jacek L., Mattison, Rebecca L., Knowles, Jonathan C., Baek, Song-Yi, Chrzanowski, Wojciech, and New, Elizabeth J.

Subjects
Silver, Spectrometry, Fluorescence, Bacteria, Coumarins, Life Sciences–Chemistry interface, Candida albicans, Metal Nanoparticles, Fluorescent Dyes
Abstract

Silver-containing nanomaterials are of interest for their antibiotic properties, for a wide range of applications from medicine to consumer products. However, much remains to be learnt about the degradation of such materials and their effects on human health. While most analyses involve measurement of total silver levels, it is important also to be able to measure concentrations of active free Ag(I) ions. We report here the preparation of a coumarin-based probe, thiocoumarin silver sensor 1 (TcAg1), that responds reversibly to the addition of silver ions through the appearance of a new fluorescence emission peak at 565 nm. Importantly, this peak is not observed in the presence of Hg(II), a common interferent in Ag(I) sensing. To establish the utility of this sensor, we prepared silver-doped phosphate glasses with demonstrated bactericidal properties, and observed the Ag(I) release from these glasses in solutions of different ionic strength. TcAg1 is therefore a useful tool for the study of the environmental and medical effects of silver-containing materials.

Published
2018

18. Preconditioning with interleukin‐1 beta and interferon‐gamma enhances the efficacy of human umbilical cord blood‐derived mesenchymal stem cells‐based therapy via enhancing prostaglandin E2 secretion and indoleamine 2,3‐dioxygenase activity in dextran sulfate sodium‐induced colitis

Author

Yu, Yeonsil, primary, Yoo, Sae Mi, additional, Park, Hwan Hee, additional, Baek, Song Yi, additional, Kim, Yoon‐Jin, additional, Lee, Seunghee, additional, Kim, Yu Lee, additional, Seo, Kwang‐Won, additional, and Kang, Kyung‐Sun, additional

Published
2019
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19. Therapeutic effect of long‐interval repeated intravenous administration of human umbilical cord blood‐derived mesenchymal stem cells in DBA /1 mice with collagen‐induced arthritis

Author

Yu, Yeonsil, primary, Yoon, Kyung‐Ae, additional, Kang, Tae‐Wook, additional, Jeon, Hyo‐Jin, additional, Sim, Yun‐Beom, additional, Choe, Seung Hoon, additional, Baek, Song Yi, additional, Lee, Seunghee, additional, Seo, Kwang‐Won, additional, and Kang, Kyung‐Sun, additional

Published
2019
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25. MMPP Attenuates Non-Small Cell Lung Cancer Growth by Inhibiting the STAT3 DNA-Binding Activity via Direct Binding to the STAT3 DNA-Binding Domain

Author

Son, Dong Ju, primary, Zheng, Jie, additional, Jung, Yu Yeon, additional, Hwang, Chul Ju, additional, Lee, Hee Pom, additional, Woo, Ju Rang, additional, Baek, Song Yi, additional, Ham, Young Wan, additional, Kang, Min Woong, additional, Shong, Minho, additional, Kweon, Gi Ryang, additional, Song, Min Jong, additional, Jung, Jae Kyung, additional, Han, Sang-Bae, additional, Kim, Bo Yeon, additional, Yoon, Do Young, additional, Choi, Bu Young, additional, and Hong, Jin Tae, additional

Published
2017
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33. Phosphorus doped SnO 2 thin films for transparent conducting oxide applications: synthesis, optoelectronic properties and computational models.

Author

Powell MJ, Williamson BAD, Baek SY, Manzi J, Potter DB, Scanlon DO, and Carmalt CJ

Abstract

Phosphorus doped tin(iv) oxide (P:SnO 2 ) films have been synthesised by an aerosol assisted chemical vapour deposition route. Triethyl phosphate was used as the phosphorus dopant source. The phosphorus concentration in solution was found to be key to electrical properties, with concentrations between 0.25-0.5 mol% phosphorus giving the lowest resistivities of the deposited films. The conductivity of the films synthesised improved on doping SnO 2 with phosphorus, with resistivity values of 7.27 × 10 -4 Ω cm and sheet resistance values of 18.2 Ω □ -1 achieved for the most conductive films. Phosphorus doping up to 1.0 mol% was shown to improve visible light transmission of the deposited films. The phosphorus doping also had a significant effect on film morphology, with varying microstructures achieved. The films were characterised by X-ray diffraction, scanning electron microscopy, UV/vis spectroscopy, Hall effect measurements and X-ray photoelectron spectroscopy. The data generated was used to build computational models of phosphorus as a dopant for SnO 2 , showing that the phosphorus acts as a shallow one-electron n-type donor allowing for good conductivities. Phosphorus does not suffer from self-compensation issues associated with other dopants, such as fluorine.

Published
2018
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34. A metastatic hepatoma model of rats using the 13762-MAT-B-III cell line: basic characteristics and potential as a tool for interventional oncology experiments.

Author

Choi JW, Kim HC, Baek SY, Ryu YJ, and Chung JW

Subjects
Animals, Carcinoma, Hepatocellular secondary, Cell Line, Tumor, Disease Models, Animal, Humans, Liver Neoplasms pathology, Magnetic Resonance Imaging, Male, Rats, Inbred F344, Carcinoma, Hepatocellular therapy, Chemoembolization, Therapeutic, Liver Neoplasms therapy
Abstract

Aim: To evaluate the characteristics of a 13762-MAT-B-III model in the rat liver and to assess the adequacy of the model for transarterial embolization (TAE) study., Materials and Methods: One hundred thousand 13762-MAT-B-III rat breast cancer cells were inoculated into the livers of 11 Fisher 344 rats. Natural course via magnetic resonance imaging (MRI) follow-up, histological characteristics and tumor response after TAE were evaluated., Results: The tumor induction rate of the 13762-MAT-B-III hepatoma model was 100%. Except for one tumor that started to regress after 14 days, the 13762-MAT-B-III hepatomas showed rapid growth, up to 13.1±1.4 mm, at 21 days. Peritoneal seeding was observed in all rats. TAE was conducted successfully in three rats on day 11. The TAE-treated hepatomas were significantly smaller on day 21 (p=0.040) and had a significantly greater apoptosis ratio (p=0.046)., Conclusion: The 13762-MAT-B-III hepatoma model can be useful in many interventional oncology studies by providing consistent and rapidly growing tumors., (Copyright© 2015 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.)

Published
2015

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