NEHA AGRAWAL
Articles written in Bulletin of Materials Science
Volume 43 All articles Published: 8 August 2020 Article ID 0186
NANDINI BHANDARU NEHA AGRAWAL MENEKA BANIK RABIBRATA MUKHERJEE ASHUTOSH SHARMA
Cross-linked polydimethylsiloxane (PDMS) films and surfaces obtained by thermal cross-linking of commercially available Sylgard 184 are widely utilized in many areas of science, due to superior thermal stability, low dielectric constant, transparency and biocompatibility. Cross-linked PDMS surfaces are weakly hydrophobic and several experiments, particularly the ones that utilize capillary-driven microscale flow require the modulation of the surface wettability. A well-known strategy to achieve the same is by exposing the Sylgard 184 surface to UV/ozone (UVO) treatment at room temperature. Depending on the duration of exposure, the wettability drops from hydrophobic to a nearcompletewetting (water contact angle $\sim$10$^{\circ}$), due to the formation of a surface oxide layer. However, under normal atmospheric conditions, these surfaces recover their hydrophobicity over a period of time due to diffusive migration of the uncrosslinked oligomers to the surface, and formation of a hydrophobic dimethyl silicone layer. We explore the hydrophobic recovery process as a function of cross-linker concentration and UVO exposure time and show how a partially or fully recovered PDMS stamp may influence subsequent nanopatterning, including the possible creation of features with different morphology using a single stamp.
Volume 44 All articles Published: 21 June 2021 Article ID 0191
NEHA AGRAWAL PRIYANKA MISHRA RAHUL RANJAN PUNAM AWASTHI ALOK SRIVASTAVA DEEPTI PRASAD EKTA KOHLI
Silver nanomaterials (AgNMs) ubiquitously known for their biological applications are studied here in terms
of their shape-dependent antibacterial and anti-biofilm effect. Chemically synthesized nano-cubes (AgNCs) with size
range around 150–200 nm were compared for their biological activity with commercial nano-sphere (AgNS) of comparable
size (${\sim}$160 nm). The antibacterial activity against both
Volume 46, 2023
All articles
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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