Functionalization of SPION nanoparticle with malic acid for the development of superfinish optical surface

Md Amir, Rohit Sharma, Vinod Mishra, Kamal K. Pant, Amit K. Agarwal, Daewook Kim, S. Wazed Ali, Gufran Sayeed Khan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Optical instruments such as X-ray optics, high-power laser systems, synchrotron beamlines, lithography, and laser-based sensors, require a superfine optical surface to meet their tight optical performance tolerances. This study describes the development of a nanocomposite-based nanoabrasive that can provide a superfinish optical surface via optical polishing. The Malic acid as an organic surface modifier is functionalized with the superparamagnetic iron oxide nanoparticles (SPION). Strong chemical attachment between SPION nanoparticles and the Malic acid is verified through fourier transform infrared spectroscopy. A significant enhancement in the surface area and zeta potential value of SPION nanoparticles is observed when it is functionalized with the Malic Acid. The particle size distribution of the functionalized nanoabrasive is also narrowed down to 8–26 nm. The polishing performance of the functionalized SPION nanoabrasive has been investigated on the BK7 and Fused Silica glasses for precision optical polishing. The polishing results showed superfine surface finishing of the BK7 glass and the Fused silica glass down to the Ra value of 0.23 nm and 0.1 nm, respectively.

Original languageEnglish (US)
Article number109191
JournalOptics and Laser Technology
StatePublished - Jun 2023


  • BK7 glass
  • Fused silica glass
  • Nanoabrasives, Polishing slurry
  • Precision optical polishing
  • Superfinish substrate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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