Tag Archives: Gengfeng Zheng

Prussian blue nanocubes and ultralightweight iron oxide materials

The research itself concerns the synthesis of ultralight iron oxide frameworks but really caught my attention was the image used to illustrate the work and the term ‘Prussian blue nanocubes’,

[downloaded from http://www.wiley-vch.de/util/hottopics/mesoporous/]

[downloaded from http://www.wiley-vch.de/util/hottopics/mesoporous/]

I believed the image is meant to indicate an ultralight iron anvil resting on the head of a rose-like blossom (I was mostly wrong) as you’ll see in this Feb. 25, 2014 news item on Nanowerk (Note: A link has been removed),

Adsorption, catalysis, or substrates for tissue growth: porous materials have many potential applications. In the journal Angewandte Chemie (“Ultralight Mesoporous Magnetic Frameworks by Interfacial Assembly of Prussian Blue Nanocubes”), a team of Chinese and Australian researchers has now introduced a method for the synthesis of ultralight three-dimensional (3D) iron oxide frameworks with two different types of nanoscopic pores and tunable surface properties. This superparamagnetic material can be cut into arbitrary shapes and is suitable for applications such as multiphase catalysis and the removal of heavy metal ions and oil from water.

Materials with hierarchically organized pore systems—meaning that the walls of macropores with diameters in the micrometer range contain mesopores of just a few nanometers—are high on the wish lists of materials researchers. The advantages of these materials include their high surface area and the easy accessibility of the small pores through the larger ones. The great desirability of these materials is matched by the degree of difficulty in producing them on an industrial scale.

Scientists at Fudan University (China) and Monash University (Australia) have now successfully produced an ultralight iron oxide framework with 250 µm and 18 nm pores in a process that can be used on an industrial scale. A team led by Gengfeng Zheng and Dongyuan Zhao used highly porous polyurethane sponges as a “matrix”, which were soaked with yellow potassium hexacyanoferrate (K4[Fe(CN)6]). Subsequent hydrolysis resulted in cubic nanocrystals of Prussian blue (iron hexacyanoferrate), a dark blue pigment, which were deposited all over the surfaces of the sponge. The polyurethane sponge was then fully burned away through pyroloysis and the Prussian blue was converted to iron oxide. The result is a 3D framework of iron oxide cubes that are in turn made of iron oxide nanoparticles and contain mesopores. The material is so light that the researchers were able to balance a 240 cm3 piece on an oleander blossom.

As for Prussian blue, it’s a term I associate with portraits and landscapes. Actually, Prussian blue is a little more than that (from the Prussian blue entry on wiktionary.org),

Prussian blue (plural Prussian blues)

(inorganic chemistry) An insoluble dark, bright blue pigment, ferric ferrocyanide (equivalent to ferrous ferricyanide), used in painting and dyeing, and as an antidote for certain kinds of heavy metal poisoning.
A moderate to rich blue colour, tinted with deep greenish blue.

Here’s a sample of the colour from the wiktionary entry,

[downloaded from http://en.wiktionary.org/wiki/Prussian_blue]

[downloaded from http://en.wiktionary.org/wiki/Prussian_blue]

Prussian Blue was also the name for a short-lived white nationalist band (from the Prussian Blue essay on Wikipedia; Note: Links have been removed),

Prussian Blue was an American white nationalist pop pre-teen duo formed in early 2003 by April Gaede, mother of Lynx Vaughan Gaede[1] and Lamb Lennon Gaede,[2] sororal twins born on June 30, 1992, in Bakersfield, California.[3] The twins referred to the Holocaust as a myth[4] and their group was described as racist and white supremacist in nature.[5][6]

Lynx and Lamb were about 14 when they decided that they wanted to cease touring. In 2011, in an interview with The Daily, the twins renounced their previous politics.[7] Lamb was quoted saying, “I’m not a white nationalist anymore. My sister and I are pretty liberal now.”

Getting back to the research at hand, here’s a link to and a citation for the research into ultralight iron oxide frameworks,

Ultralight Mesoporous Magnetic Frameworks by Interfacial Assembly of Prussian Blue Nanocubes by Biao Kong, Jing Tang, Zhangxiong Wu, Jing Wei, Hao Wu, Yongcheng Wang, Prof. Gengfeng Zheng, & Prof. Dongyuan Zhao. Angewandte Chemie International Edition Article first published online: 12 FEB 2014 DOI: 10.1002/anie.201308625

Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

I really wasn’t expecting to trip across information about a holocaust-denying pre-teen pop duo (who’ve since renounced those views) in a post regarding research on iron oxide and Prussian blue nanocubes that was published in a German chemistry journal. I’m not sure this can be called ironic but it certainly has that quality.