Nanomaterials Properties and Uses

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Questions and Answers

How does particle size influence the optical properties of nanoparticles?

Increasing particle size leads to higher reflectance, while the reflectance decreases with an increasing refractive index.

What is the optimal particle size for magnetic nanoparticles, and why?

The optimal particle size for magnetic nanoparticles is less than 35 nm due to their enhanced magnetic performance at this size.

Explain how lattice parameters can change in metal nanoparticles with varying sizes.

Lattice parameters may change when nanoparticles contain metal oxides on the surface, leading to interfacial stress due to mismatches with the metal's lattice.

What mechanical advantages do nanoparticles have over bulk materials?

<p>Nanoparticles provide a larger surface area and enhanced mechanical properties such as increased hardness, adhesion, stress and strain, and elastic modulus.</p> Signup and view all the answers

How can the mechanical properties of organic compounds be improved using nanoparticles?

<p>The mechanical properties of organic compounds can be enhanced by adding inorganic nanoparticles, which improve hardness and resistance.</p> Signup and view all the answers

What determines the magnetic value in multicomponent nanoparticles?

<p>In multicomponent nanoparticles, the magnetic value is determined by the number of lone pair electrons according to the VSEPR theory.</p> Signup and view all the answers

What is a major factor influencing the mechanical properties of nanoparticles?

<p>The composition of the nanostructure is a major factor that influences the mechanical properties of nanoparticles.</p> Signup and view all the answers

Why is the particle size change generally small with minimal effects on lattice parameters?

<p>Generally, changes in particle size are small, meaning they do not significantly alter the lattice parameters of metals.</p> Signup and view all the answers

What is the primary technique used in the gas phase method for producing TiO2 thin films?

<p>The primary technique is Electron beam (E-beam) evaporation.</p> Signup and view all the answers

What are the advantages of using the microwave radiation method for producing nanomaterials?

<p>The advantages include not requiring high temperature calcination for long periods and it is a quick method for creating crystalline nanomaterials.</p> Signup and view all the answers

How does the sol-gel method allow for the introduction of dopants in nanomaterials?

<p>The sol-gel method allows for impregnation or co-precipitation of nanomaterials, facilitating the introduction of dopants.</p> Signup and view all the answers

What are some factors that can affect gel formation in the sol-gel technique?

<p>Factors include type of solvent, water content, acid or base content, precursor type, precursor concentration, and temperature.</p> Signup and view all the answers

What is one benefit of producing TiO2 thin films using E-beam evaporation compared to the CVD method?

<p>One benefit is that E-beam evaporation results in smoother films with better conductivity.</p> Signup and view all the answers

What is the role of the colloidal suspension in the sol-gel process?

<p>The colloidal suspension forms from the hydrolysis and polymerization reactions of precursors, crucial for gel formation.</p> Signup and view all the answers

In the microwave radiation method, how can high-quality rutile rods be created?

<p>High-quality rutile rods can be created by combining hydrothermal and microwave methods.</p> Signup and view all the answers

Why is the sol-gel technique noted for its scalability and high purity in nanomaterials?

<p>The sol-gel technique allows for controlled synthesis and can be easily scaled up, resulting in high-purity nanomaterials.</p> Signup and view all the answers

What are the main categories of nanomaterials mentioned in the text?

<p>The main categories of nanomaterials are carbon nanomaterials, metal and metal oxide nanomaterials, organic nanomaterials, nanocomposites, and ceramic nanomaterials.</p> Signup and view all the answers

Name two examples of metal and metal oxide nanomaterials.

<p>Gold (Au) and silver (Ag) are examples of metal nanomaterials, while titanium dioxide (TiO2) and zinc oxide (ZnO) are examples of metal oxide nanomaterials.</p> Signup and view all the answers

What characteristic distinguishes organic nanomaterials from carbon-based or inorganic nanomaterials?

<p>Organic nanomaterials mainly contain organic matter and possess noncovalent bonds, which are weaker and can be easily broken.</p> Signup and view all the answers

What is a nanocomposite?

<p>A nanocomposite is formed by combining one type of nanomaterial with another type, which can include combinations of carbon-based, metal-based, or organic-based nanomaterials with larger materials.</p> Signup and view all the answers

What benefits do ceramic nanomaterials exhibit due to their nanoscale dimensions?

<p>Ceramic nanomaterials exhibit enhanced structural, electro-optical, superconductive, ferromagnetic, and ferroelectric properties.</p> Signup and view all the answers

How does the doping concentration affect Ti-doped BiFeO3 nanoceramics?

<p>Changing the doping concentration can induce structural distortion and eliminate oxygen vacancies in Ti-doped BiFeO3 nanoceramics.</p> Signup and view all the answers

Why are noncovalent bonds significant in organic nanomaterials?

<p>Noncovalent bonds are significant in organic nanomaterials because they allow for easy modification and changes in the nanomaterial's structure.</p> Signup and view all the answers

What is the size definition of nanoceramic materials?

<p>Nanoceramic materials are defined as inorganic solids with dimensions smaller than 100 nanometers.</p> Signup and view all the answers

According to Gleiter's classification, what primarily influences the characteristics of nanomaterials?

<p>The characteristics of nanomaterials are primarily influenced by their grain boundaries.</p> Signup and view all the answers

What are the two main categories for classifying the origin of nanomaterials?

<p>Nanomaterials can be classified as naturally originating or synthetically produced.</p> Signup and view all the answers

Name two natural sources where nanomaterials can be found.

<p>Nanomaterials can be found in the hydrosphere and microorganisms.</p> Signup and view all the answers

What is a major advantage of synthetically produced nanomaterials?

<p>A major advantage is the ability to produce large quantities of nanomaterials with different shapes and sizes.</p> Signup and view all the answers

What does the classification by Pokropivny and Skorokhod suggest about nanomaterials?

<p>It suggests that the characteristics of nanomaterials are ascribed to their shapes and dimensionalities.</p> Signup and view all the answers

What concern arises from the synthetic methods in the production of nanomaterials?

<p>The concern is whether current knowledge is sufficient to predict their performance.</p> Signup and view all the answers

What are the primary goals in the synthesis of nanomaterials?

<p>The primary goals are to ensure the nanomaterials are synthesized for specific applications.</p> Signup and view all the answers

How do synthetic nanomaterials differ in behavior compared to natural nanomaterials?

<p>Synthetic nanomaterials display different environmental behaviors than natural ones.</p> Signup and view all the answers

What are the two major methods used in the synthesis of nanomaterials?

<p>The two major methods are the 'top-down' and 'bottom-up' methods.</p> Signup and view all the answers

What is a significant disadvantage of the top-down method for producing nanomaterials?

<p>A significant disadvantage is the difficulty in producing evenly shaped nanomaterials.</p> Signup and view all the answers

How does the bottom-up method improve the properties of nanomaterials?

<p>The bottom-up method allows for precise control over particle size and shape, resulting in better morphology.</p> Signup and view all the answers

What processes are primarily involved in the top-down approach to nanomaterial production?

<p>The top-down approach primarily involves physical processes such as crushing, milling, and grinding.</p> Signup and view all the answers

Why is the bottom-up method considered environmentally friendly?

<p>The bottom-up method is considered environmentally friendly because it reduces waste and focuses on precise chemical synthesis.</p> Signup and view all the answers

What challenges are associated with the top-down method in terms of crystallographic structure?

<p>The top-down method can cause substantial crystallographic loss in the processed nanomaterials.</p> Signup and view all the answers

Why is cost a consideration in synthesizing nanomaterials?

<p>Cost is important because researchers aim for better functionality while lowering production expenses.</p> Signup and view all the answers

What is the primary goal of synthesizing nanomaterials according to researchers?

<p>The primary goal is to achieve better functionality and lower production costs.</p> Signup and view all the answers

What is the primary definition of nanomaterials?

<p>Nanomaterials are substances with grain sizes on the order of a billionth of a meter.</p> Signup and view all the answers

Describe one major difference between nanomaterials and bulk materials.

<p>A major difference is that nanomaterials possess unique properties such as increased strength and reactivity due to their small size.</p> Signup and view all the answers

Name two types of nanomaterials classified by their composition.

<p>Carbon nanomaterials and metal oxide nanomaterials are two types classified by composition.</p> Signup and view all the answers

What is one example of a production method for nanomaterials?

<p>The chemical vapor deposition method is one example.</p> Signup and view all the answers

Identify one characterization technique used for analyzing nanoparticles.

<p>Scanning Electron Microscopy (SEM) is one such technique.</p> Signup and view all the answers

List one application of nanomaterials in the biomedical field.

<p>Nanoscaffolds are an application of nanomaterials in the biomedical field.</p> Signup and view all the answers

What is a significant advantage of using nanotechnology?

<p>A significant advantage is the enhanced performance of materials in applications such as electronics and medicine.</p> Signup and view all the answers

How are nanomaterials utilized in environmental remediation?

<p>Nanomaterials are used to eliminate pollutants and in water remediation processes.</p> Signup and view all the answers

What role do antimicrobial nanopowders play in medicine?

<p>Antimicrobial nanopowders are used to prevent infections in medical applications.</p> Signup and view all the answers

What is one disadvantage of nanotechnology?

<p>One disadvantage is the potential health risks associated with exposure to nanomaterials.</p> Signup and view all the answers

Name one method for synthesizing nanomaterials using the top-down approach.

<p>Mechanical milling is a method for synthesizing nanomaterials using the top-down approach.</p> Signup and view all the answers

Identify a key component of Fourier Transform Infrared (FTIR) Spectroscopy.

<p>A key component of FTIR is the interferometer used to analyze the spectral data.</p> Signup and view all the answers

What is the purpose of using laser ablation in nanomaterial synthesis?

<p>Laser ablation is used to produce nanoparticles from a target material by vaporizing it with a focused laser beam.</p> Signup and view all the answers

Flashcards

Carbon Nanomaterials

Nanomaterials composed entirely of carbon atoms, with a focus on their structure and size.

Metal and Metal Oxide Nanomaterials

Metal and metal oxide nanomaterials are inorganic nanoparticles, such as gold, silver, titanium dioxide, and zinc oxide.

Organic Nanomaterials

Mainly composed of organic matter, without carbon or inorganic compounds. They have weak, non-covalent bonds that can be easily manipulated.

Nanocomposites

Combinations of different types of nanomaterials, like blending metal with carbon or organic materials.

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Ceramic Nanomaterials

A specific type of nanomaterial made from ceramics, known for being heat-resistant, inorganic, and non-metallic.

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Doping

The ability to change the properties of materials by adding small amounts of another element, often influencing their structure and electrical conductivity.

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Elimination of Oxygen Vacancies

The process of removing oxygen atoms from a material, which can impact its properties and electrical conductivity.

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Porous Material

A material with a porous structure, allowing for increased surface area and potential for various applications.

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What are nanomaterials?

Nanomaterials are substances with grain sizes in the range of one billionth of a meter, also known as nanocrystalline materials.

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What is Nanotechnology?

Nanotechnology involves manipulating materials at the atomic and molecular level, resulting in unique properties and applications.

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How do nanomaterials differ from bulk materials?

Nanomaterials exhibit different properties compared to their bulk counterparts due to their extremely small size and increased surface area.

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What are carbon nanomaterials?

Carbon nanomaterials are a group of nanomaterials based on carbon, including fullerenes, graphene, and carbon nanotubes.

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What are Metal and Metal Oxide Nanomaterials?

Metal and metal oxide nanomaterials are composed of metal atoms or compounds, often exhibiting unique optical, electrical, and magnetic properties.

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What are Organic Nanomaterials?

Organic nanomaterials are composed of carbon-based molecules and often exhibit specific properties influenced by their structure and functional groups.

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What are Nanocomposites?

Nanocomposites combine two or more different materials at the nanoscale, resulting in enhanced properties like strength or conductivity.

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What are Ceramic Nanomaterials?

Ceramic nanomaterials, or nanoceramics, are ceramic materials engineered at the nanoscale, possessing improved strength, hardness, and thermal resistance.

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What are Semiconductor Nanomaterials?

Semiconductor nanomaterials are materials with electrical conductivity between that of a conductor and an insulator, often used in electronics and solar cells.

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What are Polymeric Nanomaterials?

Polymeric nanomaterials are polymers engineered at the nanoscale, often possessing enhanced properties such as flexibility, strength, and biocompatibility.

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How are Nanomaterials Classified based on size and dimensions?

Nanomaterials are classified based on their dimensions and sizes, categorized into 0D, 1D, 2D, and 3D structures.

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How are Nanomaterials classified based on their origin?

Nanomaterials can be naturally occurring or synthetically manufactured, each with unique properties and applications.

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What are the main methods for synthesizing Nanomaterials?

Top-down methods involve breaking down larger materials into nanoscale components, while bottom-up methods involve assembling nanoscale structures from individual atoms or molecules.

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What is the Hydrothermal method of Nanomaterial synthesis?

The hydrothermal method involves synthesizing nanomaterials in a high-pressure, high-temperature aqueous solution.

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What is the Solvothermal method of Nanomaterial synthesis?

The solvothermal method is similar to hydrothermal, but uses solvents other than water, enabling synthesis of different nanomaterials.

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Gleiter's Classification

Nanomaterials whose properties are determined by their grain boundaries, according to Gleiter's classification.

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Pokropivny and Skorokhod Classification

Nanomaterials whose properties are determined by their shape and dimensionality, according to Pokropivny and Skorokhod.

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Natural Nanomaterials

Nanomaterials formed naturally in the environment, usually in biological species like microbes or plants.

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Synthetic Nanomaterials

Nanomaterials created through human intervention, often using biological, chemical, or physical methods.

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Synthesis of Nanomaterials

Creating nanomaterials with precise shapes and sizes for specific applications.

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Characterization of Nanomaterials

Methods used to evaluate the properties and characteristics of nanomaterials.

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Doping of Nanomaterials

The process of adding small amounts of another element to a material to change its properties, often affecting its electrical conductivity.

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Top-Down Method

Production methods that involve breaking down bulk materials into smaller nanoparticles using physical processes like crushing, milling, and grinding.

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Bottom-Up Method

Production methods that involve building up nanomaterials atom-by-atom or molecule-by-molecule. This method is often used to create uniform and well-defined nanoparticles.

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Precise Chemical Synthesis

Nanomaterial production methods that aim to control specific chemical processes to ensure uniform particle size, distribution, and morphology.

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Environmentally Friendly and Economical Methods

Nanomaterial production methods that are environmentally friendly and economical, avoiding waste and minimizing costs.

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Uniformity in Nanomaterial Production

The ability to produce evenly shaped nanomaterials and control their size and distribution.

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Surface Structure Control

The challenge of creating nanomaterials with specific surface structures that can influence their physical properties and reactivity.

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Crystallographic Losses in Nanomaterial Production

The challenge of minimizing losses in the shape and crystal structure of nanomaterials during production.

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Functionality in Nanomaterial Production

The ability to produce nanomaterials with specific desired functionalities, such as improved electrical conductivity or catalytic activity.

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Gas Phase Method

A method for producing thin films by chemically or physically reacting precursors in the gas phase.

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Electron Beam (E-beam) Evaporation

A common gas phase method involving electron bombardment to heat the TiO2 material, resulting in evaporation and deposition of a thin film.

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Microwave Radiation Method

A rapid method for producing crystalline nanomaterials, particularly useful for high-quality rutile rods, using microwave energy to drive chemical reactions.

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Conventional Sol-Gel Method

A versatile and controllable method for synthesizing various oxide materials by using chemical reactions in a liquid solution.

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Physical Vapor Deposition (PVD)

A type of gas phase deposition that creates thin films without any chemical reactions. It's a physical process where atoms from a vapor deposit on a substrate.

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Chemical Vapor Deposition (CVD)

A common method for producing thin films, often contrasting with physical vapor deposition (PVD), where chemical reactions play a crucial role in the deposition process.

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Gel Maturation

A step in the Sol-Gel method that involves the maturation of a wet gel in a different solvent, influencing the final properties of the nanomaterial.

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Scattering in nanoparticles

The scattering of light by particles, which can change depending on the size of the nanoparticles. Smaller particles scatter light differently than larger particles.

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Reflectance in nanoparticles

The amount of light reflected back from a surface. Nanoparticles can affect reflectance based on their size. Larger particles usually reflect more light.

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Magnetic properties of nanoparticles

The property of a material to attract or repel magnets. Nanoparticles can exhibit unique magnetic properties depending on their size and composition.

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Magnetic moment in nanoparticles

The strength of a magnet. For nanoparticles, magnetic moment can be influenced by the number of magnetic atoms or the number of lone pair electrons in the material.

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Mechanical properties of nanoparticles

The way a material reacts to stress and strain. Nanoparticles can be harder, stronger, and more resistant to wear than their bulk counterparts.

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Hardness in nanoparticles

The ability of materials to resist deformation. Nanoparticles can improve the hardness of materials, making them more resistant to scratching and wear.

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Tensile strength in nanoparticles

The ability of a material to resist stretching. Nanoparticles can improve the tensile strength of materials, making them stronger and more durable.

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Improving organic materials with nanoparticles

The ability of nanoparticles to improve the properties of organic materials. Adding nanoparticles to organic compounds can make them stronger and more resistant to damage.

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Study Notes

Nanomaterials (Properties and Uses)

  • Nanomaterials are substances with grain sizes in the billionths of a meter
  • They possess unique properties in terms of their chemical, physical, and mechanical properties compared to their bulkier counterparts
  • These properties can be exploited in various applications for structural and non-structural packages
  • Applications include next-generation laptop chips, kinetic energy penetrators, better insulation, flat-panel displays, advanced cutting tools, pollution remediation, and more energy-efficient batteries
  • Nanomaterials are classified into seven categories: Carbon, Metal and metal oxide, Organic, Nanocomposites, Ceramic, Semiconductor, and Polymeric
  • Synthetic nanomaterials can be produced in large quantities with diverse shapes and sizes, offering precise control over chemical and physical properties
  • Top-down and bottom-up methods are commonly used for synthesis
  • Top-down approaches involve breaking down bulk materials into smaller particles
  • Bottom-up approaches involve assembling atoms or molecules to create nanomaterials with controlled size, shape, and distribution
  • Characterization techniques such as SEM, TEM, XRD, FTIR, TGA and EDX are used for evaluating properties of nanomaterials
  • Nanoparticles have unique electronic, optical, magnetic, and mechanical properties that differ from their bulk counterparts due to their high surface area to volume ratio, and quantum effects
  • Nanomaterials are finding applications in electronics, medicine, and other fields
  • Nanotechnology is an interdisciplinary field with applications in many areas, including manufacturing, construction, and environmental remediation.

List of Contents

  • Chapter One: Introduction of Nanomaterials: Definition, History, Main differences between nanomaterials and bulk materials, Types and Classification of nanomaterials, Carbon, Metal and metal oxide, Organic, Nanocomposites, Ceramic, Semiconductor, and Polymeric nanomaterials, Classification of Nanomaterials, Dimensions and Sizes, Origin of Nanomaterials, Natural vs Synthetic Nanomaterials
  • Chapter Two: Synthesis of Nanomaterials: Methods and Characterizations: Introduction, Methods to Synthesize Nanomaterials, Top-Down Method, Bottom-up Methods, (Specific methods like Hydrothermal, Solvothermal, Chemical Vapor Deposition, Thermal Decomposition, Pulsed Laser Ablation, Templating, Combustion, Gas Phase, Microwave Radiation and Conventional Sol-Gel) Characterization of Nanoparticles
  • Chapter Three: Methods of Detection of Nanomaterials: Introduction, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) Spectroscopy, X-Ray Diffraction (XRD)
  • Chapter Four: Applications, Advantages and Disadvantages of Nanomaterials: Introduction, Electronics, Displays, High energy density batteries, High- sensitivity sensors, Transportation and telecommunication, Car Tire, Car Bumpers, Imaging, Biomedical Applications, Drug Delivery, Gene Transfection, Medical Imaging, Nasal Vaccination, Nucleic Acid Sequence and Protein Detection, Treatment for local anesthetic toxicity, Pollution Remediation (Water Remediation, Elimination of pollutants), Cosmetics, Coatings (Self-cleaning windows, Scratch resistant materials), Textiles, Insulation materials, Nanocomposites, Paints Mechanical Engineering (Cutting Tools, Lubricants)
  • Conclusions and Recommendations:
  • References: (List of citations)

List of Abbreviations

  • (List of abbreviations and their meanings)

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