Preface

The chemistry of cobalt compounds has attracted attention in recent years due to its applications in biological systems as antimicrobial agents and antibacterial agents. To design new drugs, medical chemistry can take advantage of the properties of cobalt ions and compounds. Cobalt studies continue because of their wide range of functions and applications in pharmaceutical technology. These studies have led to the emergence of medical bioorganometallic chemistry and the expansion of medical inorganic chemists. Studies in this field have led to new and difficult questions to date and this will continue. A recent literature review showed that many new cobalt compounds have been used in many different areas as scientists are seeking answers to these questions.

This book presents knowledge of the new cobalt compounds that can be used in many different applications for scientists, engineers, and students. The chapters include novel approaches of cobalt, nanostructured cobalt, new catalysts in some reactions, and biological systems and technologies.

We hope that the book will shed light on new horizons for scientists, engineers, and students.

**II**

**Section 6**

Route toward Practical Applications

Perovskite-Type Material Lanthanum Cobaltite LaCoO3: Aspects

Perovskite-Type Lanthanum Cobaltite LaCoO3: Aspects of Processing

*by Mirela Dragan, Stanica Enache, Mihai Varlam and Konstantin Petrov*

of Processing Route Toward Practical Applications **89**

**Chapter 6 91**

**Aynur Manzak** Department of Chemistry, Sakarya University, Sakarya, Turkey

**Yasemin Yildiz** Vocational School of Health Services, Sakarya University, Sakarya, Turkey

**1**

Section 1

Introduction

Section 1 Introduction

**3**

**Chapter 1**

**1. Introduction**

method [8], etc. [9].

Ag nanoparticles [9].

technologies [15].

Introductory Chapter: Cobalt

Compounds and Applications

Cobalt has a subject of extensive research and application area due to being ferromagnetic with high thermostability, multivalent, a high-melting point (1493°C), and retaining its strength to a higher temperature [1]. Some of them are antimicrobial agents in biological systems, biocompatible magnetic-fluids, hybrid supercapacitors, magnetic resonance imaging and controlled drug delivery, nanostructured cobalt gas sensors, microwave absorbing paints and catalytic activity in

Some of these extensive functions and applications can be mentioned. Cobalt ferrite (CoFe2O4) has a great physical and chemical stability and large anisotropy, making it suitable for biomedical applications. It has a magnetic property due to its tetrahedral (Td) and octahedral (Oh) sites, which include cation. Also, it is used to enhance the scope of materials in the biomedical field. Synthesis of CoFe2O4 is carried out by the following methods: sol-gel [3], solid-state reaction method [4], microemulsion [5], combustion [6], chemical coprecipitation [7], hydrothermal

The CoFe2O4 is a suitable material in energy harvesting/storage and conversion, pathogen detection, chemoresistive sensor, and dye degradation. Besides these features, it also has applications such as magnetic resonance imaging, magnetic fluid hyperthermia, drug delivery, and tissue repair. CoFe2O4 ferrite nanoparticles can be utilized in various antimicrobial applications that they have good antimicrobial activity against all tested bacteria, especially, Gram-negative bacteria. This feature of theirs can bring a new perspective to future studies in other ferrite and composite structures [10]. Also, the antimicrobial activity of CoFe2O4 was augmented with the addition of silver in some research [3, 11–13]. Kooti et al. [14] found that the antibacterial activity of Ag-coated CoFe2O4 nanocomposites is more efficient than

Cobalt oxide nanostructures have the matchless advantages of high theoretical capacity, highly active catalytic properties, and outstanding thermal/chemical stability. So, they are used as electrode materials for various electrochemical applications. Cobalt oxides are used in many research areas. They are abundant on earth and low cost and have environmental compatibility and excellent thermal stability and exceptional physical and chemical properties. Cobalt oxides have been successfully synthesized and used so far for various applications. These metal oxides stand out in applications of electrochemical energy devices. It will be used in theoretical calculations and simulations in the design of new cobalt oxide-based materials for practical applications in new studies. These studies encourage nanoscience and nanotechnology and the development of materials science, with regard to energy

some reactions, active sites for electrochemical applications [2].

*Aynur Manzak and Yasemin Yildiz*
