Nanomaterials are typically described as engineered substances possessing at least one dimension between 1 and 100 nm. Materials at the nanoscale display distinctive or enhanced characteristics, such as increased chemical reactivity, superior sensing performance, and improved mechanical properties. Nanotechnology provides a straightforward, rapid, clean, and cost-effective approach for synthesizing a wide range of organic compounds, encouraging many researchers to transition from conventional synthetic techniques. This article aims to highlight the fundamental concept of nanomaterials, their methods of preparation, and their overall significance.The synthesis of nanomaterials can generally be categorized into two major strategies: top‑down and bottom‑up approaches. In the top‑down method, bulk materials are reduced to nanoscale dimensions through processes such as milling, lithography, and etching. Conversely, the bottom‑up approach involves assembling nanostructures from atoms or molecules using techniques like chemical vapor deposition, sol‑gel methods, and green synthesis. Among these, green synthesis has attracted considerable interest due to its environmentally benign nature, employing plant extracts, microorganisms, or other biological agents to fabricate nanoparticles without harmful chemicals. The exceptional properties of nanomaterials are largely attributed to their high surface area‑to‑volume ratio along with quantum mechanical effects. These factors strongly affect their optical, electrical, magnetic, and catalytic properties. Consequently, nanomaterials have wide‑ranging applications across fields such as healthcare, electronics, environmental management, and energy systems. For example, in medicine, nanoparticles are widely utilized in targeted drug delivery, imaging, and diagnostic applications. Similarly, in environmental applications, they are effectively used in water treatment and pollution control by facilitating the removal of contaminants. Furthermore, nanotechnology has revolutionized catalysis by providing highly active and selective catalysts, thereby improving reaction efficiency and reducing waste generation. Despite these advantages, concerns regarding toxicity, environmental impact, and safe handling of nanomaterials must be carefully addressed. Therefore, ongoing research is essential to ensure the sustainable development and responsible use of nanotechnology in the future

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1. LaVan DA, McGuire T, Langer R. Small-scale systems for in vivo drug delivery. Nat Biotechnol. 2003;21(10):1184–1191.
2. Boisseau P, Loubaton B. Nanomedicine, nanotechnology in medicine. C R Phys. 2011;12(7):620–636.
3. Ansari NH, Singh SK, Shukla RK. Recent Research in Physical & Chemical Sciences and Engineering.
4. Allen TM, Cullis PR. Drug delivery systems: Entering the mainstream. Science. 2004;303(5665):1818–1822.
5. Minchin R. Nanomedicine: Sizing up targets with nanoparticles. Nat Nanotechnol. 2008;3(1):12–13.
6. Martis E, Badve R, Degwekar M. Nanotechnology based devices and applications in medicine: An overview. Chronicles of young Scientists. 2012 Jan 1;3(1):68.
7. Wang AZ, Langer R, Farokhzad OC. Nanoparticle delivery of cancer drugs. Annu Rev Med. 2012;63:185–198.
8. Feynman RP. There’s plenty of room at the bottom. 1959 Dec. Available from: Retrieved March 2010.
9. Trotta F, Mele A, editors. Nanomaterials: classification and properties. In: Nanosponges: synthesis and applications. 1st ed. London: Wiley; 2019.
10. Smith SC, Rodrigues DF. Carbon-based nanomaterials for removal of chemical and biological contaminants from water: A review of mechanisms and applications. Carbon. 2015;91:122–143.
11. Alagarasi A. Introduction to nanomaterials. In: Viswanathan B, editor. Nanomaterials. Narosa Publishing House; 2009.
12. Asmatulu R. Nanotechnology safety in the automotive industry. In: Nanotechnology safety. New York: Elsevier; 2013. p. 57–72.
13. Bratovcic A. Different applications of nanomaterials and their impact on the environment. SSRG Int J Mater Sci Eng. 2019;5(1):1–7.
14. Shafiq M, Anjum S, Hano C, Anjum I, Abbasi BH. An overview of the applications of nanomaterials and nanodevices in the food industry. Foods. 2020;9:148.
15. Sundeep H, Yo HJ, Huang JL. Int J Nanoscience. 2010;9(3):225.
16. Ravikrishna A. Engineering chemistry. 10th ed. Chennai: Sri Krishna Hi-Tech Publishing Company; 2009 Jul.
17. Arivalagan K, Karthikeyan R. Engineering chemistry. Chennai: Shiv Publications; 2007 Jul.
18. Varma RS, Saini RK, Dahiya R. Tetrahedron Lett. 1997;38:7823.
19. Kidwai M, Sapra P. Org Prep Proced Int. 2001;33:381.
20. Gedye R, Smith F, Westaway K, Ali H. Tetrahedron Lett. 1986;27:279.
21. Rajkumar N, Umamaheswari D, Ramachandran K. Int J Nanoscience. 2010;9(3):243.
22. Rao CNR, Müller A, Cheetham AK. The chemistry of nanomaterials: Synthesis, properties and applications. John Wiley & Sons; 2004.
23. Herring C, Galt JK. Elastic and plastic properties of very small metal specimens. Physical Review. 1952 Mar 15;85(6):1060.
24. Veprek S, Argon AS. Mechanical properties of superhard nanocomposites. Surface and Coatings Technology. 2001 Sep 1;146:175-82.
25. Iijima S, Ichihashi T. Single-shell carbon nanotubes of 1-nm diameter. nature. 1993 Jun 17;363(6430):603-5.
26. OMA de Souza R, SM Miranda L. Recent advances in the Morita-Baylis-Hillman reaction under microwave irradiation. Mini-Reviews in Organic Chemistry. 2010 Aug 1;7(3):212-20.
27. Raman N, Ravichandran S. Effect of substituents on N-(1-piperidinobenzyl) acetamide and N-(1-morpholinobenzyl) acetamide and their antimicrobial activity. Asian Journal of Chemistry. 2003 Jul 1;15(3):1848.
28. Raman N, Ravichandran S. Studies on Schiff base complexes of beta-diketones/beta-ketoesters with 2, 4-dinitrophenylhydrazone and their antimicrobial activities. Polish Journal of Chemistry. 2004;78:2005-12.
29. Satheesh KP, Ravichandran S, Chandrasekar KB. Int J Chem Tech Res. 2011;3(4):1740–1746.
30. Wong SS, Harper JD, Lansbury PT, Lieber CM. Carbon nanotube tips: high-resolution probes for imaging biological systems. Journal of the American Chemical Society. 1998 Jan 1;120(3):603-4.
31. Shaffer MS, Windle AH. Fabrication and characterization of carbon nanotube/poly (vinyl alcohol) composites. Advanced materials. 1999 Aug;11(11):937-41.

Nanomaterials are typically described as engineered substances possessing at least one dimension between 1 and 100 nm. Materials at the nanoscale display distinctive or enhanced characteristics, such as increased chemical reactivity, superior sensing performance, and improved mechanical properties. Nanotechnology provides a straightforward, rapid, clean, and cost-effective approach for synthesizing a wide range of organic compounds, encouraging many researchers to transition from conventional synthetic techniques. This article aims to highlight the fundamental concept of nanomaterials, their methods of preparation, and their overall significance.The synthesis of nanomaterials can generally be categorized into two major strategies: top‑down and bottom‑up approaches. In the top‑down method, bulk materials are reduced to nanoscale dimensions through processes such as milling, lithography, and etching. Conversely, the bottom‑up approach involves assembling nanostructures from atoms or molecules using techniques like chemical vapor deposition, sol‑gel methods, and green synthesis. Among these, green synthesis has attracted considerable interest due to its environmentally benign nature, employing plant extracts, microorganisms, or other biological agents to fabricate nanoparticles without harmful chemicals. The exceptional properties of nanomaterials are largely attributed to their high surface area‑to‑volume ratio along with quantum mechanical effects. These factors strongly affect their optical, electrical, magnetic, and catalytic properties. Consequently, nanomaterials have wide‑ranging applications across fields such as healthcare, electronics, environmental management, and energy systems. For example, in medicine, nanoparticles are widely utilized in targeted drug delivery, imaging, and diagnostic applications. Similarly, in environmental applications, they are effectively used in water treatment and pollution control by facilitating the removal of contaminants. Furthermore, nanotechnology has revolutionized catalysis by providing highly active and selective catalysts, thereby improving reaction efficiency and reducing waste generation. Despite these advantages, concerns regarding toxicity, environmental impact, and safe handling of nanomaterials must be carefully addressed. Therefore, ongoing research is essential to ensure the sustainable development and responsible use of nanotechnology in the future

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.

1. LaVan DA, McGuire T, Langer R. Small-scale systems for in vivo drug delivery. Nat Biotechnol. 2003;21(10):1184–1191.
2. Boisseau P, Loubaton B. Nanomedicine, nanotechnology in medicine. C R Phys. 2011;12(7):620–636.
3. Ansari NH, Singh SK, Shukla RK. Recent Research in Physical & Chemical Sciences and Engineering.
4. Allen TM, Cullis PR. Drug delivery systems: Entering the mainstream. Science. 2004;303(5665):1818–1822.
5. Minchin R. Nanomedicine: Sizing up targets with nanoparticles. Nat Nanotechnol. 2008;3(1):12–13.
6. Martis E, Badve R, Degwekar M. Nanotechnology based devices and applications in medicine: An overview. Chronicles of young Scientists. 2012 Jan 1;3(1):68.
7. Wang AZ, Langer R, Farokhzad OC. Nanoparticle delivery of cancer drugs. Annu Rev Med. 2012;63:185–198.
8. Feynman RP. There’s plenty of room at the bottom. 1959 Dec. Available from: Retrieved March 2010.
9. Trotta F, Mele A, editors. Nanomaterials: classification and properties. In: Nanosponges: synthesis and applications. 1st ed. London: Wiley; 2019.
10. Smith SC, Rodrigues DF. Carbon-based nanomaterials for removal of chemical and biological contaminants from water: A review of mechanisms and applications. Carbon. 2015;91:122–143.
11. Alagarasi A. Introduction to nanomaterials. In: Viswanathan B, editor. Nanomaterials. Narosa Publishing House; 2009.
12. Asmatulu R. Nanotechnology safety in the automotive industry. In: Nanotechnology safety. New York: Elsevier; 2013. p. 57–72.
13. Bratovcic A. Different applications of nanomaterials and their impact on the environment. SSRG Int J Mater Sci Eng. 2019;5(1):1–7.
14. Shafiq M, Anjum S, Hano C, Anjum I, Abbasi BH. An overview of the applications of nanomaterials and nanodevices in the food industry. Foods. 2020;9:148.
15. Sundeep H, Yo HJ, Huang JL. Int J Nanoscience. 2010;9(3):225.
16. Ravikrishna A. Engineering chemistry. 10th ed. Chennai: Sri Krishna Hi-Tech Publishing Company; 2009 Jul.
17. Arivalagan K, Karthikeyan R. Engineering chemistry. Chennai: Shiv Publications; 2007 Jul.
18. Varma RS, Saini RK, Dahiya R. Tetrahedron Lett. 1997;38:7823.
19. Kidwai M, Sapra P. Org Prep Proced Int. 2001;33:381.
20. Gedye R, Smith F, Westaway K, Ali H. Tetrahedron Lett. 1986;27:279.
21. Rajkumar N, Umamaheswari D, Ramachandran K. Int J Nanoscience. 2010;9(3):243.
22. Rao CNR, Müller A, Cheetham AK. The chemistry of nanomaterials: Synthesis, properties and applications. John Wiley & Sons; 2004.
23. Herring C, Galt JK. Elastic and plastic properties of very small metal specimens. Physical Review. 1952 Mar 15;85(6):1060.
24. Veprek S, Argon AS. Mechanical properties of superhard nanocomposites. Surface and Coatings Technology. 2001 Sep 1;146:175-82.
25. Iijima S, Ichihashi T. Single-shell carbon nanotubes of 1-nm diameter. nature. 1993 Jun 17;363(6430):603-5.
26. OMA de Souza R, SM Miranda L. Recent advances in the Morita-Baylis-Hillman reaction under microwave irradiation. Mini-Reviews in Organic Chemistry. 2010 Aug 1;7(3):212-20.
27. Raman N, Ravichandran S. Effect of substituents on N-(1-piperidinobenzyl) acetamide and N-(1-morpholinobenzyl) acetamide and their antimicrobial activity. Asian Journal of Chemistry. 2003 Jul 1;15(3):1848.
28. Raman N, Ravichandran S. Studies on Schiff base complexes of beta-diketones/beta-ketoesters with 2, 4-dinitrophenylhydrazone and their antimicrobial activities. Polish Journal of Chemistry. 2004;78:2005-12.
29. Satheesh KP, Ravichandran S, Chandrasekar KB. Int J Chem Tech Res. 2011;3(4):1740–1746.
30. Wong SS, Harper JD, Lansbury PT, Lieber CM. Carbon nanotube tips: high-resolution probes for imaging biological systems. Journal of the American Chemical Society. 1998 Jan 1;120(3):603-4.
31. Shaffer MS, Windle AH. Fabrication and characterization of carbon nanotube/poly (vinyl alcohol) composites. Advanced materials. 1999 Aug;11(11):937-41.