logo icmab ochoa 02 01 logo icmab ochoa 02 01
  • NEWS

Origami magnetic cellulose: controlled magnetic fraction and patterning of flexible bacterial cellulose


Muling Zeng, Anna Laromaine*, Wenqian Feng, Pavel A. Levkin and Anna Roig* .
J. Mater. Chem. C, 2014, Advance Article

DOI: 10.1039/C4TC00787E

Cellulose of microbial origin is becoming a commodity structural material with promise in a myriad of potential applications. The range of applications can be further enlarged by nanocomposites that provide additional functional properties to the bacterial cellulose. Here, bacterial cellulose films nanocomposited with iron oxide nanoparticles are fabricated by microwave-assisted thermal decomposition within only 5 min and without the need for any post-synthetic treatment. The in situ synthesized nanoparticles are crystalline, less than 10 nm in size, and with a narrow particle-size distribution.

Control over the magnetic fraction (from 4 to 40 wt%) is achieved either by employing undried cellulose, cellulose films dried by different methods, or by adjusting the initial iron precursor concentration. Structural, magnetic, and mechanical characterization of the materials is included. All films react easily to an external magnetic field, present a superparamagnetic behavior at room temperature, and are flexible enough to be bent and folded into complex origami shapes. Interestingly, films with low magnetic fraction are also transparent which is a highly attractive property for magnetic materials since most of them are either metallic or absorb visible light. Finally, preliminary results on a strategy to selectively pattern bacterial cellulose with nanoparticles are presented that pave the way to new uses of functional bacterial cellulose.

See more posts on ICMAB related to: Muling Zeng , Anna Laromaine , Wenqian Feng , Pavel A. Levkin , Anna Roig

Related Topics: Biomaterials and materials for drug delivery, therapy, diagnostics and sensing

Also on ICMAB...

  • Iron oxide nanoparticles stress the cells

    07 August 2017 708 hit(s)

    ICMAB researchers lead a study on the toxicity of iron oxide nanoparticles based on the analysis of specific genetic markers linked to nanotoxicity in the C. elegans organisms. Part of the experiment, published in the journal Nanotoxicology, has been carried out at the ALBA Synchrotron, in its infrared light MIRAS beamline. The study suggests that nanoparticles can be captured by intestinal cells in their interior, they can interact with cell lipids, and they can activate cellular mechanisms of oxidative stress.
  • Three INPhINIT "la Caixa" Research Fellows will start their PhD at ICMAB on September 2017

    03 August 2017 691 hit(s)

    We are very happy to announce that, out of a total of 57 PhD positions offered by the INPhINIT doctoral fellowship for outstanding early-stage researchers, the Institute of Materials Science of Barcelona (ICMAB) will welcome three new PhD students, placing the Institute fourth among the 28 centres that were chosen.