Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis Edited by Tatyana Shabatina and Vladimir Bochenkov Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis Edited by Tatyana Shabatina and Vladimir Bochenkov Published in London, United Kingdom Supporting open minds since 2005 Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis http://dx.doi.org/10.5772/intechopen.83226 Edited by Tatyana Shabatina and Vladimir Bochenkov Contributors Fuwei Zhuge, Yuqian Chen, Yu Huang, Hongcheng Ruan, Bipin Deochand Lade, Julien Bras, Le Gars Manon, Lorelei Douard, Naceur Belgacem, Mondher Yahya, Faouzi Hosni, Ahmed Hichem Hamzaoui, Daniel Bellet, Dorina T. Papanastasiou, Joao Resende, Viet Huong Nguyen, Carmen Jiménez, Ngoc Duy Nguyen, David Muñoz-Rojas, Alessandro Fanti, Matteo Bruno Lodi, Tatyana Shabatina, Vladimir Bochenkov, Liangxing Hu, Nan Wang, Kai Tao, Gülay Baysal, Zihni Onur Onur Uygun, Hilmiye Deniz Ertuğrul Uygun, Arti S. 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First published in London, United Kingdom, 2020 by IntechOpen IntechOpen is the global imprint of INTECHOPEN LIMITED, registered in England and Wales, registration number: 11086078, 5 Princes Gate Court, London, SW7 2QJ, United Kingdom Printed in Croatia British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library Additional hard and PDF copies can be obtained from orders@intechopen.com Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis Edited by Tatyana Shabatina and Vladimir Bochenkov p. cm. Print ISBN 978-1-83880-253-0 Online ISBN 978-1-83880-254-7 eBook (PDF) ISBN 978-1-83968-407-4 Selection of our books indexed in the Book Citation Index in Web of Science™ Core Collection (BKCI) Interested in publishing with us? Contact book.department@intechopen.com Numbers displayed above are based on latest data collected. For more information visit www.intechopen.com 5,100+ Open access books available 156 Countries delivered to 12.2% Contributors from top 500 universities Our authors are among the Top 1% most cited scientists 126,000+ International authors and editors 145M+ Downloads We are IntechOpen, the world’s leading publisher of Open Access books Built by scientists, for scientists BOOK CITATION INDEX C L A R I V A T E A N A L Y T I C S I N D E X E D Meet the editors Prof., Dr. Tatyana I. Shabatina is the Head of the Laboratory on Low Temperature Chemistry of the Department of Chemistry, M.V. Lomonosov Moscow State University. She graduated in Chemistry with honors in 1978 (MSU), 1984 - Ph.D. in Physi- cal Chemistry (MSU), 2013 - Doctor of Chemical Sciences, in Physical Chemistry (MSU), 1994 - research training in Max- Plank Institute, Muelheim (Germany), 1996 -research train- ing at the University of Amsterdam (Nederland), 2000 - research scientist in the Kansas State University (USA), 2009 - Visiting Professor, exchange visit with the University of York (UK). Her scientific activity is connected mainly with cryo- and nanochemistry, metal nanoclusters and hybrid metal-mesogenic nanosystems, drug nanoforms and cryospectroscopy. Her awards include the M.V. Lomonosov Moscow State University Prize for young scientists (1984) and the Diploma of winner of M.V. Lomonosov Moscow State University Innovation Projects Exhibitions (2004, 2012, 2016). She was the supervisor of 8 PhD students and 12 undergraduates. She is the author of more than 120 scientific papers, 4 books and 4 book chapters, and 6 patents of Russian Federation. Dr. Vladimir E. Bochenkov is a Leading Scientist of Lomonosov Moscow State University (MSU). He achieved his M.Sci. in Chemistry (2000) and PhD in Physics and Mathematics (2004) from MSU. Since 2004 he has been working as a scientific re- searcher at MSU. From 2011 to 2016, he has been working as a Postdoctoral Researcher at the iNANO Center of Aarhus Uni- versity. His scientific activity has been connected mainly with nanomaterials, including the development of new nanofabrication techniques, experimental studies of plasmonic nanomaterials combined with computer simula- tion of their properties, and molecular dynamics simulations of stimuli-responsive polymers. He is an author of 41 scientific publications, 1 book, and 1 book chapter. Contents Preface X II I Chapter 1 1 Biomedical Applications of Biomaterials Functionalized with Magnetic Nanoparticles by Matteo Bruno Lodi and Alessandro Fanti Chapter 2 19 Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La 0.8 Sr 0.2 MnO 3 Nanomanganite by Mondher Yahya, Faouzi Hosni and Ahmed Hichem Hamzaoui Chapter 3 41 Chiral Hybrid Nanosystems and Their Biosensing Applications by Vladimir E. Bochenkov and Tatyana I. Shabatina Chapter 4 61 Fullerene Based Sensor and Biosensor Technologies by Hilmiye Deniz Ertuğrul Uygun and Zihni Onur Uygun Chapter 5 77 Cellulose Nanocrystals: From Classical Hydrolysis to the Use of Deep Eutectic Solvents by Manon Le Gars, Loreleï Douard, Naceur Belgacem and Julien Bras Chapter 6 95 Phytonanofabrication: Methodology and Factors Affecting Biosynthesis of Nanoparticles by Bipin D. Lade and Arti S. Shanware Chapter 7 113 The Components of Functional Nanosystems and Nanostructures by Gülay Baysal Chapter 8 133 Metallic Nanowire Percolating Network: From Main Properties to Applications by Daniel Bellet, Dorina T. Papanastasiou, Joao Resende, Viet Huong Nguyen, Carmen Jiménez, Ngoc Duy Nguyen and David Muñoz-Rojas Chapter 9 149 Emerging Artificial Two-Dimensional van der Waals Heterostructures for Optoelectronics by Hongcheng Ruan, Yu Huang, Yuqian Chen and Fuwei Zhuge Chapter 10 167 Catalytic Micro/Nanomotors: Propulsion Mechanisms, Fabrication, Control, and Applications by Liangxing Hu, Nan Wang and Kai Tao II XII Preface The book describes modern trends in nanoscience and nanotechnology for creation of smart hybrid nanosystems combining inorganic nano-objects with organic, biological, and biocompatible materials, which create multifunctional and remotely controlled platforms for diverse technical and biomedical uses. The published mate- rial includes several review and original research articles devoted to the problems of directed chemical and biological synthesis of such nanosystems, thorough analysis of their physical and chemical properties and prospects of their possible applications. The combination of magnetic nanoparticles and biocompatible materials leads to the manufacturing of a multifunctional and remotely-controlled platform useful for diverse biomedical applications. The first chapter, “Biomedical Applications of Biomaterials Functionalized with Magnetic Nanoparticles” by Matteo B. Lodi and Alessandro Fanti, describes the possibilities of the formation of such hybrid nanosys- tems and the variety of their biomedical use. It covers the questions of mathematical modeling of the drug delivery processes and assesses the problem of establishing the influence of the system on tissue regeneration. On the other hand, if a time-varying magnetic field is applied, the magnetic nanoparticles would dissipate heat, which can be exploited to perform local hyperthermia treatment on residual cancer cells in bone tissue. To perform the treatment planning, it is necessary to account for the modeling of the intrinsic non-linear nature of the heat dissipation dynamics in magnetic pros- thetic implants. In this work, numerical experiments to investigate the physio-patho- logical features of the biological system, linked to the properties of the nanocomposite magnetic material, to assess its effectiveness as therapeutic agent are presented. Magnetic nanoparticles (MNPs) display physical and chemical properties different from those found in their corresponding bulk materials. These properties make them attractive in various applications such as energy, electronics, sensor designs of all kinds, catalysts, magnetic refrigeration, optics, and in various biomedi- cal applications. These multifunctional nanomaterials can be used as contrast agents for medical imaging, nano-vectors to transport therapeutic agents to their target, local delivery of drugs or used to destroy the cancer cells by local hyper- thermia. These magnetic platforms should possess small size combined with high magnetic susceptibility and loss of magnetization after removal of the magnetic field. Chapter 2, “Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La 0.8 Sr 0.2 MnO 3 Nanomanganite” by Mondher Yahya, Faouzi Hosni, and Ahmed Hichem Hamzaoui, describes the questions of the optimization of the nanoparticle’s size, size distribution, agglomeration, surface coatings and shapes along with the changes in magnetic properties prompted by the application of magnetic nanoparticles in diverse fields. Nowadays, plasmonic nanostructures attract an increasing attention as signal amplifiers and transducers for optical sensing. The local plasmon-induced enhance- ment of electric fields affects various optical processes in molecular systems and therefore finds various applications in enhanced spectroscopic techniques, such as Surface-Enhanced Raman Scattering (SERS), Plasmon-Enhanced Fluorescence (PEF), Surface-Enhanced Infrared Absorption (SEIRA), etc. Chapter 3, “Chiral IV Hybrid Nanosystems and Their Biosensing Applications” by Vladimir E. Bochenkov and Tatyana I. Shabatina, is devoted to chiral biosensing using various metal- containing hybrid nanosystems based on optically active organic and biological molecules. Plasmonic nanosystems and nanostructures provide an excellent platform for label-free detection of molecular adsorption by detecting tiny changes in the local refractive index or by amplification of light-induced processes in biomolecules. Based on recent theoretical and experimental developments in plasmon-enhanced techniques, we consider the main types of plasmonic nanosys- tems capable of generating an amplified chiroptical signal for such applications as detecting the presence of certain biomolecules and, in some cases, for the determi- nation of molecular orientations and their higher-order supramolecular structure. Sensor and biosensor technologies have demonstrated rapid progress in recent years. These technologies use nanosystems that are highly important in immobiliza- tion of materials for recognition the target molecules. Chapter 4, “Fullerene Based Sensor and Biosensor Technologies” by Hilmiye Deniz Ertuğrul Uygun and Zihni Onur Uygun, describes a number of studies of fullerene-based sensor nanomateri- als. As zero-dimensional nanomaterials, fullerenes provide an extremely large surface area. Therefore, they provide more biological or non-biological recognition receptors immobilized on this surface area. Moreover, increasing the surface area with more recognition agent also increases the sensitivity. In this book chapter, the examples of the development of fullerene-based sensor and biosensor technologies and their modifications and the comparison of fullerene-type sensor and biosensor applications in different cases are presented and discussed. Carbon nanomaterials can increase the sensitivity of different diagnostic sys- tems due to the increase of surface area and conductivity. Chapter 5, “Cellulose Nanocrystals: From Classic Hydrolysis to the Use of Deep Eutectic Solvents”, by Manon Le Gars, Loreleï Douard, Naceur Belgacem, and Julien Bras, describes recent achievements in the development of a promising sub-branch of diagnostic systems– point-of-care diagnostic tests–which has made great progress due to the use of the fundamentals of sensor and biosensor nanotechnology. The synthesis of cellulose nanocrystals for diagnostic systems development is considered in detail. The greener way of producing metal nanoparticles is the easiest, cheapest, and the most efficient way of producing large-scale nanoparticles that have no adverse effect on the environment. Chapter 6, “Phytonanofabrication: Methodology and Factor Affecting Biosynthesis of Nanoparticles” by Bipin D. Lade and Arti S. Shanware, dis- cussed in detail the preparation of silver nanoparticles using various methodologies and the biological synthesis. The effects of various sources and methods on nanopar- ticle synthesis, the impact of conditions such as dark, light, heating, boiling, sonica- tion, autoclave on the size and shape of colloidal nanoparticles have been analyzed. The authors discuss the effects of specific parameters such as leaf extract concentra- tion, AgNO 3 , reaction temperature, pH, light, and stirring time for nanoparticle synthesis and the results on the impact of silver nanoparticles on plant physiology. Smart nanosystems are used in many fields such as medicine, biomedical, biotech- nology, agriculture, environmental pollution control, cosmetics, optics, health, food, energy, textiles, automotive, communication technologies, agriculture, and electron- ics. Chapter 7, “The Components of Functional Nanosystems and Nanostructures” written by Gülay Baysal, is devoted to the questions of new synthetic, diagnostic, and treatment methods for production of nanospheres, nanorobots, biosensors, quantum dots, and biochips, which are considered to be the main components of XIV smart nanosystems and the combination of nanotechnological approaches based on mimicking the principle of atomic sequence in nature for their creation. Chapter 8, “Metallic Nanowire Percolating Network: From Main Properties to Applications” by Daniel Bellet, Dorina T. Papanastasiou, Joao Resende, Viet Huong Nguyen, Carmen Jiménez, Ngoc Duy Nguyen, and David Muñoz-Rojas, is devoted to metallic nanowire (MNW) networks that appear to be one of the most promising flexible, efficient, and low-cost transparent electrodes that can be integrated for many applications. This includes several applications related to energy technolo- gies (photovoltaics, lighting, supercapacitor, electro-chromism) or displays (touch screens, transparent heaters) as well as Internet of Things linked with renewable energy and autonomous devices. Randomly deposited MNW - AgNW or CuNW networks present record values of sheet resistance values below 10 Ω/sq, optical transparency of 90% and high mechanical stability under bending tests. Networks are destined to address a large variety of emerging applications. The main proper- ties of MNW networks, their stability, and their integration in energy devices are discussed in this contribution. In Chapter 9, “Emerging Artificial Two-Dimensional van der Waals Heterostructures for Optoelectronics” written by Hongcheng Ruan, Yu Huang, Yuqian Chen and Fuwei Zhuge, the authors introduce the basic concept of the design of hybrid nanosystems and hetero-nanostructures for optoelectronics and describe the pick-transfer methods for their artificial assembly. They discuss the recent progress in fabricating novel 2D van der Waals heterostructures for func- tional devices. In view of the rapid progress in this field, the chapter is not intended to cover all aspects of the field but focuses on optoelectronic related application, typically photodiode and phototransistors for photodetection and optoelectronic memories that integrate both light sensing and memory function. Chapter 10, “Catalytic Micro/Nanomotors: Propulsion Mechanisms, Fabrication, Control and Applications” by Liangxing Hu, Nan Wang and Kai Tao, describes self-propelled micro/nanomachines and micro/nanomotors, which are capable of converting the surrounding fuels into mechanical movement or force. Inspired by naturally occurring biomolecular motor proteins, scientists extensively paid great attention to synthetic micro/nanomotors. Especially, the authors describe the pos- sibility of the creation of catalytic micro/nanomotors. The future of this research field can be bright, but some major challenges such as biocompatible materials and fuels, smart controlling, and specifically practical applications still need to be resolved. In this chapter, propulsion mechanisms, fabrication methods, controlling strategies, and potential applications of catalytic micro/nanomotors are presented and summarized. We hope that this book will be useful for different nanoscience research groups and PhD and graduate students, to introduce them to the world of hybrid metal-organic and metal-biological nano-objects and smart self-organizing nanosystems and open new views of possible use of them in different scientific and practical areas. Tatyana I. Shabatina and Vladimir E. Bochenkov Lomonosov Moscow State University, Moscow, Russia V XV Chapter 1 Biomedical Applications of Biomaterials Functionalized with Magnetic Nanoparticles Matteo Bruno Lodi and Alessandro Fanti Abstract The combination of magnetic nanoparticles and a biocompatible material leads to the manufacturing of a multifunctional and remotely controlled platform useful for diverse biomedical issues. If a static magnetic field is applied, a magnetic scaf- fold behaves like an attraction platform for magnetic carriers of growth factors, thus being a potential tool to enhance magnetic drug delivery in regenerative medicine. To translate in practice this potential application, a careful and critical description of the physics and the influence parameter is required. This chapter covers the mathematical modeling of the process and assesses the problem of establishing the influence of the drug delivery system on tissue regeneration. On the other hand, if a time-varying magnetic field is applied, the magnetic nanoparticles would dissipate heat, which can be exploited to perform local hyperthermia treat- ment on residual cancer cells in the bone tissue. To perform the treatment planning, it is necessary to account for the modeling of the intrinsic nonlinear nature of the heat dissipation dynamic in magnetic prosthetic implants. In this work, numeric experiments to investigate the physiopathological features of the biological system, linked to the properties of the nanocomposite magnetic material, to assess its effectiveness as therapeutic agents are presented. Keywords: biomaterials, bone tumors, bone repair, drug delivery, hyperthermia, magnetic nanoparticles, RF heating, scaffolds 1. Introduction Nanotechnologies aim to ease and to satisfy the needs of regenerative medicine 1 by providing multifunctional, theranostic, and stimuli-responsive biomaterials [1, 2]. In particular, stimuli-responsive biomaterials such as magneto-responsive biomaterials are devices capable of reacting to an external magnetic field spatio- temporally in a specific way [3]. This powerful class of biomaterials is a promising candidate as active and therapeutic scaffolds for advanced drug delivery and tissue regeneration applications [3, 4]. Multifunctional magnetic-responsive materials can be manufactured by modi- fying or functionalizing traditional materials employed in tissue engineering or by 1 Regenerative medicine is a tissue regeneration technique based on the replacement or repair of diseased tissue or organs to restore a lost or impaired function [1]. 1 incorporating magnetic nanoparticles (MNPs) in the biocompatible matrix [4, 5]. Table 1 reports examples of several magnetic biomaterials synthesized in the liter- ature [6]. An approach to create a magnetic biomaterial is the impregnation of a polymer or ceramic (e.g., ε -poly caprolactone or hydroxyapatite) with MNPs dis- persed in a ferrofluid (FF) [5, 6]. Subject to the action of capillarity, the nanoparticles fill the superficial defects and pores of the biomaterials. In this way a nanocomposite is created, i.e., the final material is a two-phase system strength- ened by the magnetic iron phase [7]. Moreover, a multifunctional and composite material of such type can be obtained by the polymerization of a polymer in the presence of magnetic nanoparticles of magnetite (Fe 3 O 4 ) or maghemite ( γ -Fe 2 O 3 ). This allows to produce a solid object using rapid prototyping and additive manufacturing techniques, such as electrospinning or 3D bioplotting [7]. In alternative, a stable, repeatable, and controllable manufacturing technique of magnetic-responsive biomaterial is the chemical doping of or substitution with F 2 þ or F 3 þ ions in a ceramic material (e.g., hydroxyapatite, β -tricalcium phosphate, and hardystonite). This process gives rise to an intrinsic magnetic and biocompatible material, which can be used in the form of microparticles or directly as a bulk object with tunable and ad hoc properties for therapeutic or regenerative medicine applications [8, 9]. Given these methods, the magnetic biomaterial can be processed to develop a tissue-guiding structure or a tissue scaffold, i.e., a device intended to be implanted in an injured site for supporting and withstanding the cell adhesion, proliferation, and differentiation, in order to restore tissue continuity and functioning [10]. Magnetic scaffolds (MagS) have been proposed for the following three main applications, as presented in Figure 1 [1 – 9]: Type of scaffold Synthesis technique M s , emu � g � 1 Type of MNPs r mnp HA/collagen Impregnation 0.35 – 15 Fe 3 O 4 200 HA/collagen Impregnation 0.50 γ -Fe 2 O 3 , Fe 3 O 4 10 – 50 HA/PLA Electrospinning 0.05 γ -Fe 2 O 3 5 β -TCP Impregnation 0.6 – 1.2 Fe 3 O 4 250 Chitosan/PVA membrane Electrospinning 0.7 – 3.2 Fe 3 O 4 n.s. Calcium silicate/chitosan Mixture 6 – 10 SrFe 12 O 19 500 PMMA Mixture n.s. Fe 3 O 4 10 Silicate Mixture n.s. γ -Fe 2 O 3 n.s. Fe-doped HA Chemical substitution 4 HA-Fe 3 O 4 10 – 14 Fe-hardystonite Chemical doping 0.1 – 1.2 Fe 3 O 4 20 – 60 Bredigite Milling 7 – 25 Ca 7 MgSi 4 O 16 -Fe 3 O 4 120 HA Impregnation 12 – 20 Fe 3 O 4 200 HA Impregnation 1 – 2.5 γ -Fe 2 O 3 8 HA Impregnation n.s. γ -Fe 2 O 3 5 Chitosan In situ precipitation 4 γ -Fe 2 O 3 , Fe 3 O 4 n.s ε -PCL 3D Bioplotting 0.2 – 0.3 Fe 3 O 4 25 – 30 PLGA Electrospinning 2 – 10 Fe 3 O 4 8.47 Table 1. Magnetic scaffolds divided by composition, production, and MNPs embedded. Redrafted from [5]. 2 Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis • To provide a controlled mechanical stimulation of tissues and boost the healing response • To develop a smart and reliable magnetic drug delivery system (MDD) • To generate therapeutic heat and perform local hyperthermia (HT) against cancer cells The mechanical stimulation of injured tissues using magneto-responsive scaf- folds found application in bone tissue engineering, where static magnetic field (SMF) or low-frequency magnetic field is used to elicit osteoprogenitor cells [1 – 4]. The rationale of employing magnetic scaffolds as part of a MDD system is the need to have an “ attraction platform ” to target and control the attraction of mag- netic liposomes or MNPs bio-conjugated with growth factors (GFs) [6, 11]. Indeed, recently several magnetic carriers of biomolecules capable of acting on cell function were developed. However, using an external SMF their delivery to deep tissue and to the site of damage is complicated, and the MNPs tend to distribute where the magnetic force is maximum, i.e., at the body surface, where the field is applied [12]. Having a MagS implanted in the injured tissue allows to attract the MNPs and the GFs while controlling their spatial distribution [13]. Finally, if the external magnetic stimulus is a radio-frequency (RF) magnetic field, the population of MNPs embedded in the biomaterial dissipates a huge amount of heat. The deposited power can be exploited as therapeutic heat, enabling to use the magnetic scaffold as a thermo-seed able to perform HT treatment against cancer cells [14]. To date, magnetic scaffolds have been synthesized and characterized in terms of chemical and physical properties while proving experimentally their powerful and promising potential in regenerative medicine and oncology [1 – 4]. However, to translate the use of these nanostructured biomaterials in the clinical practice, sev- eral limitations have to be overcome, and further investigations are required to predict their behavior [4]. The potential use of magnetic scaffolds as tissue sub- stitutes needs the combined work of material scientists, biomedical engineers, and biologists. In particular, since in the literature there is a clear lack of mathematical and numerical models, which relate the physical properties of these nanocomposite Figure 1. Magnetic scaffolds are obtained by the combination of biomaterials and MNPs. They are multifunctional and theranostic nanocomposites. The potential biomedical applications of MagS are shown. 3 Biomedical Applications of Biomaterials Functionalized with Magnetic Nanoparticles DOI: http://dx.doi.org/10.5772/intechopen.89199 biomaterials with the magnetic drug delivery or the hyperthermia, in this chapter, two mathematical models for their use as hyperthermia agent and as a tool for magnetic drug delivery are provided. Section 2 briefly reviews the use of MagS as magneto-responsive biomaterials for the stimulation of tissues, in particular bone tissues. In Section 3 the nonlinear chemico-physical properties of magnetic scaffolds are presented, described, and used to introduce a recent in silico model for the planning of bone tumor hyper- thermia [14]. Finally, in Section 4 the use of MagS as tool for active magnetic drug delivery is discussed. Furthermore, a mathematical model able of providing insights into the parameters of influence of the phenomenon is presented and analyzed [13]. The complete description of magnetic scaffolds favors the assessment of their effectiveness and their potential clinical impact. 2. Magnetic scaffolds for tissue repair and regeneration Magnetic scaffolds have been tested both in vitro and in vivo, using animal models, demonstrating that they can transduce an external magnetic signal in mechanical stimulation to the cells attached to the biomaterial surface ( Figure 1 ) [1 – 4]. MagS have been investigated for bone, cartilage, cardiovascular and neuronal regeneration, and repair [2]. The most studied tissue is bone. The injury of skeletal tissue by traumas and diseases, such as osteoporosis, or by a tumor resection calls for the need of a bone substitute or scaffold to guide cell adhesion, proliferation, and differentiation [15]. Moreover, the bone tissue requires a continuous mechani- cal stimulation. Therefore, the magneto-responsive biomaterials in Table 1 can deliver a direct mechanical stimulation if exposed to SMF, to low-frequency mag- netic field (strengths from to 18 μ T to 0.6 T, frequencies varying from 10 to 76.6 Hz), or to pulsed electromagnetic fields [4]. The mechanism of action is not fully understood yet. The presence of magnetic nanoparticles in the biomaterials determines an increased superficial roughness and favors the interaction at the cell membrane with the cell surface receptors. It has been demonstrated that the mes- enchymal stem cells (MSCs) can differentiate into osteoblast thanks to the activa- tion of the integrin signaling pathways, which upregulate the expression of the osteogenic GF bone morphogenetic protein 2 (BMP-2) [4]. The use of magnetic scaffolds permits the integration of the implant with the host tissue, accelerating the defect healing and increasing the mineral density of newly formed bone. 3. The hyperthermia treatment of bone tumors 3.1 The heat dissipation of magnetic nanoparticles To understand the magnetization dynamic and the power losses of magnetic scaffolds, it is necessary to introduce the physical and mathematic descriptions of the response to a RF magnetic field of the MNPs embedded in it. If a population of magnetic nanoparticles in a solution is exposed to a harmonic RF magnetic field, they start to dissipate power due to the hysteresis loss but also to the magnetic dipole and to the Brownian relaxations [16]: P m ¼ πμ 0 f H j j 2 χ 00 (1) where μ 0 is the vacuum permeability; f is the frequency of the applied field, in Hz; H is the amplitude of the external magnetic field; and χ 00 is the imaginary part of 4 Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis