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Chapter 5
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Development ofNanoparticles: Recent
Developments andFuture Prospects
RavichandranVeerasamy
Abstract The biotechnological approach to nanoparticle development constitutes a
remarkable convergence between biology, chemistry, and engineering, holding both
recent successes and bright potential for the future. This method uses biological
systems and processes to create, modify, and use nanoparticles for a variety of purposes. Recent advances in the production of biotechnological nanoparticles have
taken advantage of organic processes in cells, plants, and even bacteria. These
organisms are used in biosynthesis to produce nanoparticles with specic properties. For example, one can engineer bacteria and fungi to use their enzymatic activity to convert metal ions into nanoparticles. Compared to conventional chemical
processes, this strategy is environmentally friendly, sustainable, and often produces
more stable and biocompatible nanoparticles. Nanobiotechnology has made signicant progress in the eld of biomedical applications. Targeted drug delivery, imaging, and diagnostics are made possible by nanoparticles designed to interact with
biological systems. To reduce side effects and increase treatment effectiveness,
functionalized nanoparticles can deliver therapeutic drugs directly to the diseased
area. In addition, nanoparticle image contrast facilitates early disease identication.
In addition, scientists are working on nanoparticle-based biosensors that can identify specic chemicals involved in disease and transform point-of-care diagnostics.
However, standardization, scalability, and ethical issues remain. There are engineering challenges to ensure reliable and reproducible nanoparticle fabrication using
biological systems. As with any new technology, it is important to carefully consider the ethical implications of using living organisms to produce nanoparticles as
well as any potential impacts on the environment. Interdisciplinary collaboration
and thoughtful innovation will be key to maximizing the potential of biotech
R. Veerasamy (*)
Faculty of Pharmacy, AIMST University, Bedong, Kedah, Malaysia
e-mail: ravichandran_v@aimst.edu.my
Ltd. 2024
S. Bose et al. (eds.), Concepts in Pharmaceutical Biotechnology and Drug
Development, Interdisciplinary Biotechnological Advances,
https://doi.org/10.1007/978-981-97-1148-2_5
67© The Author(s), under exclusive license to Springer Nature Singapore Pte
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nanoparticles as the eld evolves. This chapter addresses potential future perspectives on this rapidly evolving topic while providing an in-depth review of current
developments in biosynthesis, characterization, and application of nanoparticles.
Keywords Nanoparticles · Recent developments · Characterization ·
Biotechnology · Biomedical applications
R. Ve era samy
5.1 Introduction
The size of nanoparticles is on the nanoscale, with a range of 1 to 100 nanometers
(nm). Metals, metal oxides, semiconductors, polymers, and even biological components can be used to create them. Because of their small size, nanoparticles have
different features and behaviors that distinguish them from bulk materials and microparticles. Nanoparticles have at least one dimension on the nanometer scale,
which is approximately 1000 times smaller than the width of a human hair. Because
of their small size and high surface area-to-volume ratio, they are extremely reactive
and capable of unusual interactions with other materials. Quantum effects become
relevant at the nanoscale. Because of their small size, nanoparticles can show quantum connement, in which the behavior of electrons is limited. The optical, electrical, and magnetic properties could therefore change. The primary surface properties
of nanoparticles stem from their huge surface area. Surface atoms or molecules can
behave differently than bulk material atoms or molecules, inuencing reactivity,
adsorption, and catalytic characteristics. Nanoparticles can outperform their bulk
counterparts in terms of mechanical qualities. Nanoparticles, for example, may have
improved hardness and tensile strength (Altammar 2023).
Metal nanoparticles, which have optical and catalytic capabilities, include gold,
silver, and platinum nanoparticles. They have numerous applications in electronics,
catalysis, and biomedicine. Iron oxide and titanium dioxide nanoparticles are two
examples of metal oxide nanoparticles that have applications in magnetic materials, catalysts, and sunscreen. Quantum dots are semiconductor nanoparticles with
customizable electronic properties that are extensively utilized in displays, imaging, and solar cells. Polymeric Nanoparticles: Made of organic polymers, these
nanoparticles are used in drug delivery systems, coatings, and nanocomposites
(Alhalili 2023).
5.2 Synthesis ofNanoparticles
Chemical reduction, sol-gel procedures, physical vapor deposition, and biological
approaches can all be used to create nanoparticles. These technologies enable exact
control of size, shape, and content, allowing nanoparticles to be engineered for specic uses.
5 Development ofNanoparticles: Recent Developments andFuture Prospects
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5.2.1 Chemical Reduction
Chemically reduced nanoparticles are a frequent and exible category of nanoparticles. The employment of reducing chemicals to transform metal ions in a solution
into metal nanoparticles is a method of chemical reduction. These techniques provide exact control of the nanoparticles’ size, shape, and composition. The use of
metal salts as precursors is usually the rst step in chemical reduction processes.
Common options include silver nitrate (AgNO3), gold chloride (HAuCl4), or other
metal precursors, depending on the type of nanoparticle that is needed. There is a
reduction agent applied to the metal precursor solution. The metal ions are reduced
to their elemental state by the reducing agent through a chemical process. Common
reducing agents include hydrazine, citrate ions, and sodium borohydride (NaBH4).
It is possible to modify the size, shape, and properties of the resulting nanoparticles
by varying the reaction temperature, reaction duration, and agent concentration. It
is possible to alter these factors to tailor nanoparticles for certain uses (Szczyglewska
etal. 2023).
5.2.2 Sol-Gel Procedures
By using a chemical process to convert a precursor sol or solution into a solid gel,
then drying and calcining the gel to create nanoparticles, sol-gel processes produce nanoparticles. With tight control over size, shape, and content, this method
is widely utilized to generate a wide spectrum of nanoparticles and nanocomposites. The process begins with a precursor sol, which is a colloidal suspension
comprising precursor compounds of metal or metal oxide. This sol is created by
dissolving metal salts or alkoxides in a solvent. A controlled chemical process,
commonly involving hydrolysis and condensation, results in the precursor sol
forming a gel, which is a three-dimensional web of interconnected nanoparticles.
This gel is made up of a continuous liquid phase and a three-dimensional network
of solid nanoparticles. During the drying process, the gel’s liquid component is
removed. There are several methods for completing this process, such as freeze
drying, supercritical uid drying, and air drying. Then calcinated the dry gel at
high temperature (typically above 400 °C), the gel is converted into a solid
nanoparticle structure during. This entails removing organic components and
crystallizing or transforming the nanoparticles into their nal form (Bokov
etal. 2021).
Sol-gel methods allow for ne control of nanoparticle size, shape, and content.
This feature is very useful for customizing materials for specic uses. Typically, the
process yields high-purity nanoparticles and nanocomposites. Sol-gel methods can
produce a variety of materials, including oxide and non-oxide nanoparticles. In the
case of silica nanoparticles, they are biocompatible and can be used in medical and
biological applications (Sopan Mahato etal. 2023).
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R. Ve era samy
5.2.3 Physical Vapor Deposition
The process of producing physical vapor deposition (PVD) nanoparticles involves
depositing vapor-phase material onto a substrate. PVD is a method that uses sputtering, evaporation, and chemical vapor deposition (CVD). PVD has various disadvantages in addition to its benets. In PVD, the material to be deposited into
nanoparticles is obtained from a material source. This source can be a heated crucible for evaporation, a liquid or solid precursor for CVD, or a solid target for sputtering. The material source is exposed to an energy source, which may be thermal
heating, plasma, or laser irradiation, depending on the PVD process. The material
transitions into the vapor phase as a result of this energy source. The material that
has vaporized is directed towards a substrate, which may be a wafer, a solid surface,
or another suitable medium. As the vapor condenses on the substrate, nanoparticles
are created. The vaporized material may nucleate and form nanoparticles on the
substrate. The PVD technology determines the specic mechanisms of growth, and
variables like temperature, pressure, and deposition rate can be changed to control
the process (Dobrzański et al. 2015; Smits et al. 2014; Vaseghi and
Nematollahzadeh 2020).
5.2.4 Biological Approaches
In biological nanoparticle production, live organisms including bacteria, fungi, and
plants as well as biological substances like enzymes and peptides are used to create
nanoparticles. While there are many benets to this sustainable and eco-friendly
approach, there are some disadvantages as well. The precise method of biologically
synthesizing nanoparticles can vary depending on the biological agent employed.
Select an appropriate biological agent, such as bacteria (e.g., E. coli), fungi (e.g.,
Aspergillus niger), plant extracts, or biological compounds (e.g., enzymes) (Ghosh
etal. 2021; Karunakaran etal. 2023; Pandit etal. 2022). If utilizing microorganisms, culture them in a suitable medium under controlled conditions. Alternatively,
plant extracts or pure biological substances can be used. Introduce the desired metal
ions (e.g., silver, gold) as precursor compounds into the culture medium or solution
containing the biological agent (Duran and Seabra 2018; Hasan etal. 2018; Kumar
etal. 2021). Through a bio-reduction process, the biological agent converts metal
ions into metallic nanoparticles.
Larger nanoparticles are eventually produced by the nucleated nanoparticles’
continued development and fusion. Reaction time and the concentration of precursor components are two examples of variables that can be used to inuence the size
and shape of the nanoparticles. After being produced, the nanoparticles are cleaned
to get rid of extra biological material and other pollutants, and they are separated
from the biological medium. The generated nanoparticles are characterized using a
variety of techniques to ascertain their dimensions, composition, and properties
(Nguyen etal. 2023).
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5.2.5 Polymeric Nanoparticle
Synthesis of polymeric nanoparticles involves creating nanoscale particles from
large molecules called polymers, which are composed of repeating subunits. These
nanoparticles can be applied to coatings, nanocomposites, and medicine delivery,
among other things. Depending on the polymer, the desired properties, and the
intended usage, many processes can be employed to make polymeric nanoparticles.
Choose a polymer that meets the requirements of the planned use. When creating
nanoparticles, poly(lactic-co-glycolic acid) (PLGA), polyethylene glycol (PEG),
chitosan, and other polymers are frequently used. Use a solvent that is compatible
with the chosen polymer to dissolve the polymer. This results in a polymer solution,
and additional chemicals or surfactants may be needed to regulate the nanoparticles’ characteristics. Following methods like centrifugation, evaporation, or dialysis, the solvent is eliminated, leaving the polymer nanoparticles oating in a liquid.
In certain situations, cross-linking agents or other chemical treatments may be utilized to enhance the stability or functionality of nanoparticles (Han et al. 2018;
Zielińska etal. 2020).
5.3 Characterization ofNanoparticles
Nanotechnology involves a thorough analysis and understanding of the physical,
chemical, and structural properties of particles that are typically between 1 and 100
nanometers in size. Because of their size, structure, and composition, nanoparticles
exhibit unique behaviors that require characterization techniques to fully comprehend. High-resolution imaging and size determination are possible with electron
microscopy (including transmission and scanning electron microscopy), while
X-ray diffraction provides crystallographic information. Optical and chemical properties can be analyzed with spectroscopic techniques like UV-Vis, FTIR, and Raman
spectroscopy. Moreover, surface charge and particle size distribution can be
ascertained using zeta potential and dynamic light scattering investigations, while
surface area and porosity are commonly assessed through BET (Brunauer-EmmettTeller) examination. Magnetic, thermal, and electrical properties are examined
using specialized techniques; surface characterization techniques such as atomic
force microscopy and X-ray photoelectron spectroscopy help to analyze the surface
topography and composition. The magnetic behavior and electron spin characteristics of nanoparticles are investigated using EPR spectroscopy. Designing nanoparticles for a range of uses, such as drug administration, catalysis, materials science,
and electronics, requires an understanding of these characteristics. Moreover,
nanoparticle characterization is a fundamental aspect of nanoscience research and
development since it ensures the security and utility of nanomaterials across a wide
range of elds. These characterization techniques are essential for assessing and
optimizing the characteristics of nanoparticles to t particular uses, such as energy
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conversion, environmental remediation, and medical and materials research.
Combining these approaches allows researchers to fully comprehend the behavior
of nanoparticles and maximize their capabilities (Jagadeesh etal. 2023; Ravichandran
etal. 2022).
R. Ve era samy
5.4 Challenges intheSynthesis ofNanoparticles
(Han etal. 2019; Khandel andShahi 2018; Patil
andChandrasekaran 2020; Ying etal. 2022)
The production of nanoparticles is a critical subject in nanoscience and nanotechnology, with signicant potential benets across a wide range of sectors. It does,
however, present signicant hurdles that researchers must solve in order to make
nanoparticles with the appropriate qualities. Some of the major issues in the synthesis of nanoparticles are as follows: Attaining precise control over the dimensions and morphology of nanoparticles can pose challenges, as numerous synthesis
methods yield a broad spectrum of sizes and forms. The uniformity of nanoparticles is crucial in specic applications, such as catalysis and drug administration.
Many synthesis processes work well in the lab but are difcult to scale up for commercial output. For practical applications, developing cost-effective and scalable
synthesis techniques is critical. It might be difcult to consistently reproduce the
same nanoparticles with precise qualities, which can cause problems with quality
control and product reliability. Variation in synthesis conditions and contaminants
can have an effect on repeatability. Because of van der Waals forces or electrostatic
interactions, nanoparticles tend to agglomerate, which might impact their properties and uses. It is difcult to stabilize nanoparticles and prevent agglomeration.
Nanoparticle production frequently entails the use of poisonous or hazardous substances. It is critical to ensure the safety of both researchers and the environment.
Furthermore, determining the possible toxicity of nanoparticles is a continuing
challenge.
The ecological consequences of nanoparticle synthesis, encompassing the generation of waste products and the utilization of energy and resources, play a crucial
role in the promotion of sustainable nanotechnology. Because of their small size and
unique features, characterizing nanoparticles is difcult. Developing appropriate
tools for precisely characterizing nanoparticles is a continuous challenge. The surface characteristics of nanoparticles inuence their behavior and usefulness signicantly. It might be difcult to create appropriate surface changes and coatings for
specialized purposes. Some advanced nanoparticle synthesis methods are expensive
and necessitate specialized equipment, limiting access to academics and enterprises
with minimal resources. As nanoparticles nd applications in a variety of industries,
worries about their safety, regulation, and ethical use continue to emerge, posing
difculties in negotiating these complex issues.
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5.5 Applications ofNanoparticles
Nanoparticles are utilized in medication delivery systems, as therapeutic agent carriers, and for imaging in diagnostics. They can target specic cells or tissues,
increasing therapy efcacy and precision. Transistors and memory devices are two
examples of electronic components made with nanoparticles. Displays make use of
quantum dots. Nanoparticles act as efcient catalysts in chemical reactions, allowing for the creation of a wide range of chemical compounds. In materials research,
nanoparticles are used to enhance material properties like coating durability and
composite strength. In environmental remediation, they can be applied to wastewater treatment and to eliminate pollutants from soil and water (Baetke etal. 2015;
Singh etal. 2019; Stark etal. 2015; Zazo etal. 2016).
5.6 Recent Developments inMicrobes-Mediated Synthesis
ofNanoparticles
Scientists have been investigating a wide variety of microorganisms, including
uncommon strains and extremophiles, in order to generate nanoparticles. The bacteria have the capacity to generate specialized nanoparticles. Extremophiles, which
thrive in severe conditions such as high salinity or temperatures, are capable of
generating nanoparticles. An understanding of the mechanics driving the synthesis
of microbial nanoparticles has enabled more exact control over their size, shape,
and characteristics. To tailor nanoparticles for specic applications, researchers
have focused on the genetic and enzymatic aspects of biogenic production.
Making biocompatible nanoparticles for biological uses is becoming more and
more common. Using microbial manufacturing techniques, low-cytotoxic nanoparticles have been produced that have potential uses in medication delivery, medical
imaging, and other healthcare elds. There have been attempts to increase the production of microbial nanoparticles for application in the industry. To satisfy the
demands of large-scale nanoparticle production for commercial usage, researchers
have been focusing on optimizing production processes such as bioreactors and
fermentation systems (Patra etal. 2018; Yusuf etal. 2023).
The use of microbes in the manufacture of multimetallic nanoparticles has
received attention. These nanoparticles, made up of various metals, have unique
features for catalysis, sensing, and other applications. The controlled construction
of these complex structures by microbes has shown promise. Several companies and
startups have developed with the intention of commercializing microbially produced nanoparticles and nanoparticle-based goods. Antimicrobial coatings, nanocatalysts, and nanomaterials for diverse sectors are examples of this. Microbial
production of nanoparticles has been investigated for environmental applications
such as heavy metal and pollutant removal from water and soil. This eco-friendly
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