Pukyong National University

About: Pukyong National University is a education organization based out in Busan, South Korea. It is known for research contribution in the topics: Phosphor & Luminescence. The organization has 6689 authors who have published 14681 publications receiving 233751 citations. The organization is also known as: PKNU.

Synthesis and characterization of CoFe2O4 magnetic nanoparticles prepared by temperature-controlled coprecipitation method

Abstract: Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized in a homogeneous aqueous solution without any template and subsequent heat treatment. The average particle size could be varied in the range of 2–14 nm by controlling coprecipitation temperature of Co2+ and Fe3+ ions in alkaline solution although the size distribution is pretty wide. As the precipitation temperature increased in the range of 20–80°C, the average particle size also increased. However, there is a considerable change in XRD crystallinity and the average size of the nanoparticles at the precipitation temperature between 40°C and 60°C. While the nanoparticles prepared at the temperature below 40°C show superparamagnetic relaxation at room temperature with blocking temperatures between 75 and 200 K, the samples prepared at the temperature higher than 60°C consist of both superparamagnetic and ferrimagnetic nanoparticles that result in magnetic coercivity at room temperature. Mossbauer spectra of the samples also confirmed their magnetic properties and wide size distribution in each sample. The analysis of the spectra gave a rough estimation of the ratio of superparamagnetic and ferromagnetic nanoparticles in each sample at various temperatures.

Recent Strategies to Develop Innovative Photosensitizers for Enhanced Photodynamic Therapy.

Abstract: This review presents a robust strategy to design photosensitizers (PSs) for various species. Photodynamic therapy (PDT) is a photochemical-based treatment approach that involves the use of light combined with a light-activated chemical, referred to as a PS. Attractively, PDT is one of the alternatives to conventional cancer treatment due to its noninvasive nature, high cure rates, and low side effects. PSs play an important factor in photoinduced reactive oxygen species (ROS) generation. Although the concept of photosensitizer-based photodynamic therapy has been widely adopted for clinical trials and bioimaging, until now, to our surprise, there has been no relevant review article on rational designs of organic PSs for PDT. Furthermore, most of published review articles in PDT focused on nanomaterials and nanotechnology based on traditional PSs. Therefore, this review aimed at reporting recent strategies to develop innovative organic photosensitizers for enhanced photodynamic therapy, with each example described in detail instead of providing only a general overview, as is typically done in previous reviews of PDT, to provide intuitive, vivid, and specific insights to the readers.

How CSR Leads to Corporate Brand Equity: Mediating Mechanisms of Corporate Brand Credibility and Reputation

Abstract: The purpose of this study is to investigate the relationships among corporate social responsibility (CSR), corporate brand credibility, corporate brand equity, and corporate reputation. Structural equation modeling analysis provided support for the hypotheses from a sample of 867 consumers in South Korea. The results showed that CSR has a direct positive effect on corporate brand credibility and corporate reputation. In addition, the results indicate that corporate brand credibility mediates the relationship between CSR and corporate reputation. Moreover, corporate brand credibility mediates the relationship between CSR and corporate reputation. Finally, the relationship between CSR and corporate brand equity is sequentially and fully mediated by corporate brand credibility and corporate reputation. The theoretical and managerial implications of the results and limitations are discussed, and future research directions are suggested.