Gold nanomakura: nanoarchitectonics and their photothermal response in association with carrageenan hydrogels

• Nabojit Das,
• Vikas,
• Akash Kumar,
• Sanjeev Soni and
• Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2024, 15, 678–693, doi:10.3762/bjnano.15.56

• photothermal conversion was exclusively assigned to morphological features (i.e., nanoparticles of higher aspect ratio showed higher temperature change and vice versa irrespective of the surfactant used). To enable biofunctionality and stability, we used kappa-carrageenan- (k-CG) based hydrogels for

• hydrogel beads attained up to ≈17.2, ≈17.2, and ≈15.7 °C, respectively. On the other hand, gold nanorods after incorporation into k-CG did not yield much photothermal response as compared to that of AuNMs. The results showed a promising platform to utilize nanomakura particles along with kappa-carrageenan

• hydrogels for enabling usage on nanophotonic, photothermal, and bio-imaging applications. Keywords: anisotropy; hydrogel; kappa-carrageenan; metal nanoparticles; nanoarchitectonics; nanomakura; photothermal properties; surfactants; Introduction Nanoarchitectonics is the fabrication of functional material

The role of deep eutectic solvents and carrageenan in synthesizing biocompatible anisotropic metal nanoparticles

• Nabojit Das,
• Akash Kumar and
• Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2021, 12, 924–938, doi:10.3762/bjnano.12.69

• cell lines [32]. Carrageenans are sulfated oligosaccharides extracted from red algae. They are composed of galactose and anhydrogalactose sub-units linked through a glycosidic bond. They are mainly categorized into three types depending on the degree of sulfation. The three types are: kappa carrageenan

Conducting composite materials from the biopolymer kappa-carrageenan and carbon nanotubes

• Ali Aldalbahi,
• Jin Chu,
• Peter Feng and
• Marc in het Panhuis

Beilstein J. Nanotechnol. 2012, 3, 415–427, doi:10.3762/bjnano.3.48

• Rico, San Juan, Puerto Rico 00931, USA 10.3762/bjnano.3.48 Abstract Conducting composite films containing carbon nanotubes (CNTs) were prepared by using the biopolymer kappa-carrageenan (KC) as a dispersant. Rheological studies indicated that 0.5% w/v was the appropriate KC concentration for

• . There are three types of carrageenan depending on the number of charged sulfated groups per biopolymer repeat unit, i.e., kappa-carrageenan (one group), iota-carrageenan (two groups) and lambda-carrageenan (three groups) [39]. Carrageenans have been extensively employed in the food industry and are

• usage as a plasticizer to increase the flexibility of polymer films [43]. In this work, it is shown that kappa-carrageenan (KC) is a suitable dispersant for the stabilization of SWNTs and MWNTs in water. The KC concentration and sonication time were optimised to facilitate the efficient dispersion of