We developed two-step solution-phase reactions to form hybrid materials of Mn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery applications. Mn3O4 nanoparticles grown selectively on RGO sheets over free particle growth in solution allowed for the electrically insulating Mn3O4 nanoparticles wired up to a current collector through the underlying conducting graphene network. The Mn3O4 nanoparticles formed on RGO show a high specific capacity up to ~900mAh/g near its theoretical capacity with good rate capability and cycling stability, owing to the intimate interactions between the graphene substrates and the Mn3O4 nanoparticles grown atop. The Mn3O4/RGO hybrid could be a promising candidate material for high-capacity, low-cost, and environmentally friendly anode for lithium ion batteries. Our growth-on-graphene approach should offer a new technique for design and synthesis of battery electrodes based on highly insulating materials.

Mn3O4-Graphene Hybrid as a High Capacity Anode Material for Lithium Ion Batteries

https://cyberleninka.org/article/n/768408.pdf

Mechanical properties of graphene and graphene-based nanocomposites

Polymeric materials with antimicrobial activity

Water-Soluble Conjugated Polymers for Imaging, Diagnosis, and Therapy

Graphene-polymer nanocomposites for structural and functional applications

Ethylene was polymerized at 40°C temperature and 1 atm. pressure using melamine-formaldehyde (M-F) supported titanium tetrachloride (TiCl4) catalyst. Polymer-supported catalysts were prepared with a different weight ratio of TiCl4/ M-F in hexane. The wt% titanium incorporated in the polymer matrix was determined by UV-visible spectroscopy. In addition, the resulting catalysts were characterized by SEM-EDX, XRD, and TGA. The catalytic productivity is found to be 4721.09 g PE/g Ti/h. The productivity of the catalysts also depends on the titanium content in the polymer matrix. The catalyst with titanium content 3.5 wt% showed maximum activity. These catalysts also showed good storability.

Melamine-Formaldehyde-Supported Titanium-Based Heterogeneous Ziegler-Natta Catalyst for Ethylene Polymerization in Slurry Process

https://doi.org/10.1080/16583655.2022.2153426

Determining fractures and their orientation for preventing in-situ seepage of water in the Poison Lake, Sikkim, India

A simple hydrothermal method was employed to synthesize various aspect ratio zinc oxide nanorods. These nanorods were incorporated into a conducting polymer, poly (9-vinylcarbazole). A series of hybrid bulk heterojunction solar cells was fabricated by using nanocomposite material as the active layer. Short circuit current density of the devices increases from 1.075 mAcm(-2) to 28.35 mAcm(-2) by increasing the aspect ratio, due to the formation of large number of charges and more percolation pathways facilitating the transport of electrons. Photo conversion efficiency of the devices was increased from 0.05 to 0.44% with increase in the aspect ratio from 8 to 20.

Hybrid Bulk Heterojunction Solar Cells Based on Poly(9-Vinylcarbazole)/Zinc Oxide Nanocomposites: Effectof Aspect Ratio of Zinc Oxide Nanorod

In this first investigation on the oil absorption capacity of poly (ethylene- co -vinyl acetate), a novel crosslinked poly (ethylene-co-vinyl acetate) (EVA) based absorbent was prepared by the grafting of maleic anhydride (MA) and cetyl alcohol (CA) in the presence of benzoyl peroxide (BP). Although EVA has been widely used in various applications like drug delivery, encapsulation, and footwear industry, however, its application in environmental remediation has not been studied in detail. In this study, melt mixing was carried out in the Brabender mixture at 120 °C. The grafted polymer was post-cured in the hot air oven at 100 °C for 24 h. The post-cured sorbent showed excellent absorption capacity in toluene (2200 %), gasoline (1720 %), crude oil (1105 %), and kerosene (390 %). The contact angle measurement reveals its hydrophobic nature (123°). The absorption properties of this hydrophobic composite remain stable even after 10 absorption/desorption cycles with absorption capacity remaining constant. The crosslinked polymer was characterized by FTIR, XRD, TGA, and SEM. • Crosslinked poly (ethylene- co -vinyl acetate) • Absorption capacity • Reusability 

Removal of organic solvents and oils from wastewater by absorption with crosslinked poly (ethylene-co-vinyl acetate) modified by cetyl alcohol

A simple and sensitive colorimetric fluorescent sensing probe for the detection of Uric Acid (UA) is designed. UA can able to quench the fluorescent properties of CsPbBr3 through hydrogen-bonding interaction....

Swapan Kumar Dolui

Papers

Melamine-Formaldehyde-Supported Titanium-Based Heterogeneous Ziegler-Natta Catalyst for Ethylene Polymerization in Slurry Process

Determining fractures and their orientation for preventing in-situ seepage of water in the Poison Lake, Sikkim, India

Hybrid Bulk Heterojunction Solar Cells Based on Poly(9-Vinylcarbazole)/Zinc Oxide Nanocomposites: Effectof Aspect Ratio of Zinc Oxide Nanorod

Removal of organic solvents and oils from wastewater by absorption with crosslinked poly (ethylene-co-vinyl acetate) modified by cetyl alcohol

Cesium Lead Bromide as a colorimetric and fluorometric sensing platform for selective detection of Uric Acid