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ADVANCES IN AEROGEL COMPOSITES FOR ENVIRONMENTAL REMEDIATION

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ADVANCES IN AEROGEL COMPOSITES FOR ENVIRONMENTAL REMEDIATION

Edited by

AFTAB ASLAM PARWAZ KHAN

Chemistry Department, Faculty of Science, and Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

MOHAMMAD OMAISH ANSARI

Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia

ANISH KHAN

Chemistry Department, Faculty of Science, and Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

ABDULLAH M. ASIRI

Chemistry Department, Faculty of Science, and Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

Elsevier

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Shahnawaze Ansari, Anish Khan, Raviraj M. Kulkarni, and Vijaykumar S. Bhamare

4.5.

3. Biomedical applications

Varish Ahmad, Abrar Ahmad, Shah Alam Khan, Aftab Ahmad, Mohammed F. Abuzinadah, Shahid Karim, and Qazi Mohammad Sajid Jamal

2.3.

2.4.

2.5.

2.6.

3.

3.6.

3.7.

3.8.

3.9.

4.

4.

Jamal Akhter Siddique, Shahid Pervez Ansari, and Madhu Yadav 1.

5.

3.

2.2.

3.4.

Shahid Pervez Ansari, Ahmad Husain, Mohd Urooj Shariq, and Mohammad Omaish Ansari

1.

3.1.

5.

6. Aerogels

Jamiu O. Eniola, Mohammad Omaish Ansari, M.A. Barakat, and Rajeev Kumar

3.3.

4. Properties of high-quality aerogel photocatalyst

5. The effect of various parameters on photocatalysis

5.1. The effect of solution pH

5.2. Concentration and nature of pollutants

5.3. Effect of dopant

6. Conclusions and future prospects

7. Aerogels for waterborne pollutants purification

Abdul Moheman, Showkat Ahmad Bhawani, and Abu Tariq

1.

2.

of aerogels in waterborne pollutants

8. Aerogel and its composites for sensing, adsorption, and photocatalysis

Akbar Mohammad, Mohammad Ehtisham Khan, Ahmed Abutaleb, Wahid Ali, Mohd. Tauqeer, Taeho Yoon, and Moo Hwan Cho

1. Brief historical background and definition of aerogels

2. Aerogels and related materials

3. Water pollutions and remediation

4. Role of aerogels and its composites

9. Metal and metal oxides aerogels in purification systems

Mohammad Ehtisham Khan, Jeenat Aslam, Akbar Mohammad, Ruby Aslam, and Waleed Hassan Alhazmi

1. Overview of metal and metal oxides aerogels

2. Aerogels: classification and basics properties

3. Basic properties of metal and oxide-based aerogels

3.1. Porosity, hardness, and functionalization in aerogels

4. Fabrication of metal and metal oxides as an aerogel

5. Synthesis methods of aerogels

5.1. Brief elaboration

5.2.

5.3.

6. Role of metals, metal-oxides aerogels in

6.1. Advances of aerogels in

6.2.

6.3.

10.

Vijaykumar S. Bhamare, Raviraj M. Kulkarni, and Aftab Aslam Parwaz Khan

3. Adsorptive

3.1.

3.2.

3.3. Removal

3.4.

3.5.

11.

Mohammad Oves, Mohd Ahmar Rauf, Mohinuddin Khan Warsi, Fohad Mabood Husain, Mohammad Omaish Ansari, and Iqbal M.I. Ismail 1.

3.

4.

5.

6.

7.

8.

12.

Baljeet Singh and Mahak Dhiman 1.

2.1. Synthesis of activated

2.2. Synthesis of graphene aerogel

2.3. Synthesis of carbon nanotube aerogel

2.4. Synthesis of carbon fiber aerogel

2.5. Synthesis of nanocellulose aerogel

3. Application of carbon aerogels

3.1. Carbon aerogels for CO2 capture

3.2. Carbon aerogels for VOC removal

3.3. Carbon aerogels for oil recovery

3.4.

13. Aerogels in the environment

Asim Jilani, Mohd Hafiz Dzarfan Othman, Mohsin Raza Dustgeer, Ammar A. Melaibari, Imran Ullah Khan, and Ghani Ur Rehman

1. Introduction

2.

2.1.

2.2.

3.

14. Carbon-based conducting polymers aerogels and their sensing behavior

Mohammad Shahadat, Asha Embrandiri, Parveen Fatemeh Rupani, Rohana Adnan, T.R. Sreekrishnan, S. Wazed Ali, and Shaikh Ziauddin Ahammad

1.

1.1.

15. Heavy metals scavenging using multidentate/multifunctional aerogels and their composites

Mohammad Shahadat, Ajaz Ahmad Wani, Yahiya Kadaf Manea, Rohana Adnan, Shaikh Ziauddin Ahammad, and S. Wazed Ali

1. Introduction

1.2. Sol-gel process

1.3. Resorcinol-formaldehyde (RF) carbon aerogel

1.5. Comparative study of different drying techniques

2. Beneficent properties of aerogels/aerogel composites for

3. Functionalization and their relation with

4.

5.

16. Applications of nanocarbon-based aerogels in purifying

Subia Ambreen, A. Dhivylakshmi, B. Shuruti, T. Dhivya, and Mohammad Danish

1.

3.

2.3.

3.1.

3.2.

4.

5.1.

5.2.

5.3.

5.4.

5.5.

Pankaj Bharmoria and Sónia P.M. Ventura

18. Bio-based aerogels and their environment applications: an overview 347

Fohad Mabood Husain, Altaf Khan, Rais Ahmad Khan, Jamal Akhter Siddique, Mohammad Oves, Aftab Aslam Parwaz Khan, Mohammad Omaish Ansari, and Hurija Dzudzevic Cancar

1. Introduction

2. Bio-based aerogels

2.1. Polysaccharide-based

3.

4.

19. Aerogel applications and future aspects

Naved Azum, Malik Abdul Rub, Anish Khan, Aftab Aslam Parwaz Khan, and Abdullah M. Asiri

1.

Contributors

Ahmed Abutaleb

Department of Chemical Engineering, Jazan University, Jazan, Saudi Arabia

Mohammed F. Abuzinadah

Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia

Rohana Adnan

School of Chemical Sciences, Universiti Sains Malaysia, USM, Penang, Malaysia

Shaikh Ziauddin Ahammad

Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology

IIT Delhi, New Delhi, India

Abrar Ahmad

Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia

Aftab Ahmad

Health Information Technology Department, Faculty of Applied Studies, King Abdulaziz University, Jeddah, Saudi Arabia

Varish Ahmad

Health Information Technology Department, Faculty of Applied Studies, King Abdulaziz University, Jeddah, Saudi Arabia

Waleed Hassan Alhazmi

Department of Mechanical Engineering, College of Engineering, Jazan University, Jazan, Saudi Arabia

S. Wazed Ali

Department of Textile Technology, Indian Institute of Technology IIT Delhi, New Delhi, India

Wahid Ali

Department of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Jazan, Saudi Arabia

Subia Ambreen

Rajkiya Engineering College, Bijnore, Uttar Pradesh, India

Mohammad Omaish Ansari

Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia

Mohammad Shahnawaze Ansari

Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia

Shahid Pervez Ansari

Department of Applied Chemistry, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Abdullah M. Asiri

Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia

Jeenat Aslam

Department of Chemistry, College of Science, Yanbu, Taibah University, Al-Madina, Saudi Arabia

Ruby Aslam

Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Naved Azum

Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

M.A. Barakat

Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia; Central Metallurgical R & D Institute, Cairo, Egypt

Vijaykumar S. Bhamare

Centre for Nanoscience and Nanotechnology, Department of Chemistry, KLS Gogte Institute of Technology, Belagavi, Karnataka, India

Pankaj Bharmoria

Chemistry Department, CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal

Showkat Ahmad Bhawani

Department of Chemistry, Faculty of Resource Science and Technology, Universiti Malaysia

Sarawak, Kota Samarahn, Sarawak, Malaysia

Hurija Dzudzevic Cancar

Department of Natural Sciences in Pharmacy, Faculty of Pharmacy, University of Sarajevo, Sarajevo, Bosnia-Herzegovina

Moo Hwan Cho

School of Chemical Engineering, Yeungnam University, Gyeongsan-si, Gyeongbuk, South Korea

Mohammad Danish

Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam, Thanjavur, Tamil Nadu, India

Mahak Dhiman

Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, United States

T. Dhivya

Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam, Thanjavur, Tamil Nadu, India

A. Dhivylakshmi

Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam, Thanjavur, Tamil Nadu, India

Mohsin Raza Dustgeer

Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad, Punjab, Pakistan

Asha Embrandiri

Department of Environmental Health, College of Medicine and Health Sciences (CMHS), Wollo University, Dessie, Ethiopia

Jamiu O. Eniola

Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia

Ahmad Husain

Department of Applied Chemistry, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Fohad Mabood Husain

Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia

Iqbal M.I. Ismail

Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah, Saudi Arabia; Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia

Asim Jilani

Center of Nanotechnology, King Abdul-Aziz University, Jeddah, Saudi Arabia; Advanced Membrane Technology Research Centre, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia; School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia

Shahid Karim

Department of Pharmacology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia

Altaf Khan

Department of Pharmacology and Toxicology, Central Laboratory, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia

Anish Khan

Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

Imran Ullah Khan

Department of Chemical and Energy Engineering, Pak-Austria Fachhochshule, Institute of Applied Sciences &Technology, Haripur, Khyber Pakhtunkhwa, Pakistan

Mohammad Ehtisham Khan

Department of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Jazan, Saudi Arabia

Rais Ahmad Khan

Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia

Shah Alam Khan

College of Pharmacy, National University of Science and Technology, Muscat, Sultanate of Oman

Raviraj M. Kulkarni

Centre for Nanoscience and Nanotechnology, Department of Chemistry, KLS Gogte Institute of Technology, Belagavi, Karnataka, India

Rajeev Kumar

Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia

Sandeep R. Kurundawade

Department of Chemistry, KLE Technological University, Hubballi, Karnataka, India

Ramesh S. Malladi

Department of Chemistry, BLDEA’s V. P. Dr. P. G. Halakatti College of Engineering and Technology,Vijaypur, Karnataka, India

Yahiya Kadaf Manea

Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Ammar A. Melaibari

Center of Nanotechnology, King Abdul-Aziz University, Jeddah, Saudi Arabia

Akbar Mohammad

School of Chemical Engineering,Yeungnam University, Gyeongsan-si, Gyeongbuk, South Korea

Abdul Moheman

Department of Chemistry, Gandhi Faiz-e-Aam College (Affiliated to M. J. P. Rohilkhand University), Shahjahanpur, Uttar Pradesh, India

Mohd Hafiz Dzarfan Othman

Advanced Membrane Technology Research Centre, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia; School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia

Mohammad Oves

Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah, Saudi Arabia

Aftab Aslam Parwaz Khan

Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

Mohd Ahmar Rauf

Use-Inspired Biomaterials & Integrated Nano Delivery (U-BiND) Systems Laboratory, Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, United States

Ghani Ur Rehman

Advanced Membrane Technology Research Centre, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia; School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia

Malik Abdul Rub

Centre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

Parveen Fatemeh Rupani

Department of New Energy, School of Energy and Power Engineering, Jiangsu University, Zhenjiang, China

Qazi Mohammad Sajid Jamal

Department of Health Informatics, College of Public Health and Health Informatics, Qassim University, Al Bukayriyah, Saudi Arabia

Mohammad Shahadat

School of Chemical Sciences, Universiti Sains Malaysia, USM, Penang, Malaysia; Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology IIT Delhi, New Delhi, India

Mohd Urooj Shariq

Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

B. Shuruti

Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam, Thanjavur, Tamil Nadu, India

Jamal Akhter Siddique

Department of Chemistry, School of Basic and Applied Sciences, Lingaya’s Vidyapeeth, Faridabad, Haryana, India

Baljeet Singh

CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Averio, Portugal

T.R. Sreekrishnan

Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology IIT Delhi, New Delhi, India

Abu Tariq

Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Mohd. Tauqeer

Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Sónia P.M. Ventura

Chemistry Department, CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal

Ajaz Ahmad Wani

Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India

Mohinuddin Khan Warsi

Department of Biochemistry, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia

Madhu Yadav

Bio-organic Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, Uttar Pradesh, India; Government Girls Inter College, Prayagraj, Uttar Pradesh, India

Taeho Yoon

School of Chemical Engineering,Yeungnam University, Gyeongsan-si, Gyeongbuk, South Korea

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Preface

Due to the burning of fossil fuels and industrial wastes, the pollution of the ecosystem is increasing day-by-day. Thus, there is an immediate urge to educate the young masses and professionals toward the newer materials capable of environmental remediation as well as various advanced environmental remediation technologies. Aerogels, the light yet mechanically strong material has the potential of being among the pioneer materials for the above-mentioned field due to wide possibility such as large surface area, ease of functionality, fabrication from natural and synthetic materials, etc. In spite of these qualities, the aerogels have yet to gain attention and wide popularity, and this is the reason for this book.

Advances in aerogel composites for environmental remediation provides a detailed innovation in the field of fabrication of different types of aerogels such as traditional silica based aerogels, polymeric aerogels, carbon aerogels, and composites aerogels.The wide contrast in properties of the aerogels in contrast to the traditional materials is the main factor, which makes it an exciting material for usage in newer and advanced technologies. Being light weight, ease of functionality and fabrication as composites makes it highly suitable material for different environmental remediation technologies such as adsorptive removal of pollutants, vapor sensing of volatile organic compounds, microbial and photocatalytic disinfection under natural and artificial systems, etc.

This book provides a wide-range exploration on the ongoing research and developments in the environmental remediation technologies using aerogel and its composites written by from eminent writers of their field. The work discusses fabrication of various aerogel composites along with their design and applications toward different environmental remediation technologies. It will make a noteworthy appeal to scientists and researchers working in the field of diverse aerogels for environmental sciences.

Advances in aerogel composites for environmental remediation consists of 19 chapters. Chapter 1 deals with the basics of aerogels and their fabrication techniques. Rest of the chapters deals with different types of aerogels and its composites, that is, natural aerogels, carbon materials based aerogels, metal and metal oxide aerogels, conducting polymers based aerogels, bio material based aerogels, and further their application in environmental remediation fields such as gas sensing, heavy metal removal, absorptive removal of pollutants, microbial disinfection, biomedical application, etc.

Aftab Aslam Parwaz Khan

Mohammad Omaish Ansari

Anish Khan

Abdullah M. Asiri

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CHAPTER 1

Aerogel and its composites: fabrication and properties

Mohammad Omaish Ansaria, Aftab Aslam Parwaz Khanb,c, Mohammad Shahnawaze Ansaria, Anish Khanb,c, Raviraj M. Kulkarnid, and Vijaykumar S. Bhamared

aCenter of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia

bChemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia

cCentre of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia

dCentre for Nanoscience and Nanotechnology, Department of Chemistry, KLS Gogte Institute of Technology, Belagavi, Karnataka, India

Chapter Outline

1

5.5

6.1

6.2

6.3

6.4

1 Introduction

The evolution of normal synthetic chemical methodologies has led to the deliberate synthesis of porous materials. The porous materials have found large number of applications in sensing, adsorption, catalysis, energy storage, etc. [1,2]. Among different porous materials, aerogels are exciting owing to their peculiar properties such as low density, small pore size, low optical index of refraction, etc. [3]. Aerogels, one of the most exciting material of the 21st century that have been in use in space industry since 1960s, but recently have

Advances in Aerogel Composites for Environmental Remediation. http://dx.doi.org/10.1016/B978-0-12-820732-1.00001-1

also found newer applications in nowadays daily-used devices and all other industrial sectors [4]. The aerogels are not one complete specific material or mineral with a definite set of chemical formula, but rather, a material possessing unique porous specific geometrical structure [5]. The fabrication strategy provides high porosity, high specific surface area, low densities, and low thermal conductivities [6,7]. The aerogels are stretchable and highly connected structures and thus can be easily fabricated into different forms and shapes. Initially most of the work on aerogels was done on silica-based materials, but nowadays many other materials such as polymers, carbonaceous materials, metal/metal oxides, etc. have also been fabricated into aerogels [8–10]. The structure of aerogels consists of mostly hollow space filled with air with very little solid material inside. This unique structure gives it a ghostly appearance and hence is also called as a frozen smoke [11].

The first aerogels were created in 1931 by Samuel S. Kistler at the College of the Pacific in Stockton, California. It was he who hypothesized that by using supercritical drying (SCD) conditions it is possible to remove liquid out of gel without compacting its shape and size [12]. He showed that at a critical point, the liquid phase can be removed without disturbing the structure and the formation of liquid-vapor interfaces. Apart from this, the capillary forces which lead to shrinkage during drying can also be avoided by using SCD conditions. The Kistler method was tedious and went unnoticed till merely 3 decades until Teichner and Nicolaon in 1960s prepared aerogels by commonly used sol-gel process [13]. The technique of Teichner and Nicolaon eliminated the time-consuming salt removal and solvent-exchange steps. They produced silica aerogels by using silicon alkoxide which speeded up the fabrication process and thus the final aerogels can be made into few hours rather than days [14].

While the structure of aerogels is highly porous with pores in the range of nanometers, the incorporation of nanomaterials can further enhance their properties [15] Carbon nanomaterials, metal, metal oxides, polymers, etc. based aerogels have shown applications in the field of sensors, energy storage, environmental remediation, etc. [16–18]. Thus, with the large number of possibilities of variety of aerogels-based composites, this field is expected to be a big boom in near future for potential applications in vast variety of areas. This chapter deals with the fabrication of aerogels and its composites, their properties and applications in different areas. The work compiled here is far from complete but covers most of the major developments and progress in this field.

2 History and progress in the field of aerogels

The pioneer discovery in the field of aerogels was done by Kistler who demonstrated that the liquid part in the wet gel can be replaced by air under SCD conditions without collapsing the original porous structure. Also, the capillary forces which dry the gel into xerogel can also be avoided. The results got published in journal Nature in 1931 [19]. Due to the drying under supercritical conditions, the formation of liquid-vapor meniscus at gel pores responsible for the mechanical tension in liquid and pore walls responsible for gel shrinkage can be avoided [7]. This results in original porous structure,

high surface area, and very low density in the aerogels. Besides silica, Kristler synthesized alumina aerogels which was very weak and other aerogels of tungstic, ferric or stannic oxide, and nickel tartrate.

The methodology of Kristler was cumbersome and the field was not much explored until in 1960s when Teichner and Nicolaon prepared aerogels from simple sol-gel process. Teichner and Nicolaon eliminated the salt removal and solvent-exchange steps which reduced time and fabricated silica aerogels by using silicon alkoxide. This process initiated fast fabrication of aerogels from many days to few hours [20].

The advancement in technique resulted in scientist working in the design and fabrication of aerogels using wide variety of materials such as: noble metal aerogels, that is, Ag, Au, Pt, Pd [21], metal oxide aerogels, that is, SiO2, TiO2, ZnO, ZrO2 [22], carbonaceous materialsbased aerogels, that is, CNT, graphene, nanodiamond-based aerogels [23–25], polymer-based aerogels, that is, polyimide, polystyrene, conducting polymers, resorcinol-formaldehyde (RF) [26], silica carbide-based aerogels [27], naturally occurring materials based aerogels, that is, cellulose and proteins [28]. These developments have lead to a stage where the focus is on their applications in advanced areas such as CO2 trapping, coatings, energy storage, etc.

Due to wide potential possibilities of aerogels, the research in this field has grown by leaps and bound in the last few decades. Fig. 1.1 demonstrates increase in the total

Figure 1.1 Total number of publications per year for the past 1 decade showing “aerogels composites” in the content as per Science Direct record (Date of search: 09 January 2020).

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