Hot paper: Layer-by-layer coating of alginate matrices with chitosan–alginate

It is postulated that probiotic bacteria play a role in maintaining good health and they have been shown to alleviate the symptoms of some common conditions such as traveller’s diarrhoea. If the bacteria are to be ingested orally, they must withstand an acid challenge in the stomach before they can reach the intestine to act. A common strategy to reduce bacterial cell death is encapsulation, usually using a polymer matrix. The naturally occurring polysaccharide alginate is the most popular probiotic encapsulation-based material.

In this hot paper, Khutoryanskiy, Charalampopoulos and co-workers evaluate the production of alginate matrices coated with multilayers of alternating alginate and chitosan as viable encapsulation materials for probiotic bacteria. The authors show, that the multilayers are stable in both simulated gastric and intestinal solutions, with encapsulation in 3-layer coated matrices giving the highest recovery of viable cells. It is suggested that this method of encapsulation could be used to protect orally administrated probiotics from the low pH of the stomach.

Layer-by-layer coating of alginate matrices with chitosan–alginate for the improved survival and targeted delivery of probiotic bacteria after oral administration
J. Mater. Chem. B
, 2013, Advance Article.  DOI: 10.1039/c2tb00126h (free to read for a short time)

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It is postulated that probiotic bacteria play a role in maintaining good health and they have been shown to alleviate the symptoms of some common conditions such as traveller’s diarrhoea. If the bacteria are to be ingested orally, they must withstand an acid challenge in the stomach before they can reach the intestine to act. A common strategy to reduce bacterial cell death is encapsulation, usually using a polymer matrix. The naturally occurring polysaccharide alginate is the most popular probiotic encapsulation-based material.

In this hot paper, Khutoryanskiy, Charalampopoulos and co-workers evaluate the production of alginate matrices coated with multilayers of alternating alginate and chitosan as viable encapsulation materials for probiotic bacteria. The authors show, that the multilayers are stable in both simulated gastric and intestinal solutions, with encapsulation in 3-layer coated matrices giving the highest recovery of viable cells. It is suggested that this method of encapsulation could be used to protect orally administrated probiotics from the low pH of the stomach.

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Happy holidays from Journal of Materials Chemistry A, B & C!

All of us in the Journal of Materials Chemistry Editorial team would like to wish you all a merry Christmas and a happy new year! The Editorial office will be closed from 21 December 2012 and will reopen on 2 January 2013.

We’re really looking forward to 2013, which will see some great themed issues in all of the Journal of Materials Chemistry family of journals as well as the 2013 Journal of Materials Chemistry Lectureship (opening for nominations early in the year).

Don’t miss out on all the journal news – follow us on twitter @JMaterChem and and like us on Facebook!

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Journal of Materials Chemistry A, B and C Issue 3’s online now!

The Issue 3’s of Journal of Material Chemistry A, B and C have been published online. Each journal showcases high impact research you expect from Journal of Materials Chemistry, now in three separate journals. For more information, please go to http://rsc.li/jmc-abc.

Journal of Materials Chemistry C features articles on the following:

Self assembled monolayers (SAMs) on metallic surfaces (gold and graphene) for electronic applications, Aravind Vijayaraghavan et al.: We review advances in the last decade in self-assembled monolayers (SAMs) for electronic applications, focusing on gold and graphene surfaces.

A D–A–D swivel-cruciform oligothiophene based on 5,5′-bibenzothiadiazole, Xiaowei Zhan et al.: A multi-dimensional D–A–D oligothiophene, 4,4′,7,7′-tetrakis(hexylbithiophene)–5,5′-bibenzo[c][1,2,5]thiadiazole swivel cruciform (BBT-SC), was synthesized. BBT-SC thin films exhibited a high intrinsic charge carrier mobility of 0.1 cm2 V−1 s−1, measured by a time-resolved microwave conductivity technique.

Low operation voltage macromolecular composite memory assisted by graphene nanoflakes, Yang-Fang Chen et al.: Bistable nonvolatile memory devices using an insulating polymer doped with solution phase of graphene nanoflakes are fabricated through a simple one-step solution-process.

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Journal of Materials Chemistry A features articles on the following:

Ca-based synthetic materials with enhanced CO2 capture efficiency, Jose Manuel Valverde, This manuscript reviews the development of novel sorbents to improve the CO2 capture performance of natural limestone at Ca-looping conditions.

Microporous metal–organic frameworks with open metal sites as sorbents for selective gas adsorption and fluorescence sensors for metal ions
, Xian-He Bu et al.: Two cluster-based microporous MOFs exhibit highly selective uptake for CO2 over CH4 and N2 under ambient conditions. 1 also provides an ideal luminescence sensor for selectively probing Ba2+ and Cu2+ ions based on its significant fluorescence enhancement or quenching.

Derivatives of 5-nitro-1,2,3-2H-triazole – high performance energetic materials, Jean’ne M. Shreeve et al.: The derivatives of 5-nitro-1,2,3-2H-triazole are energetic materials, in particular 2-amino-4,5-dinitro-1,2,3-2H-triazole which exhibits good properties (Td,onset, 190 °C; P, 36.2 GPa; vD, 8843 m s−1; IS, 24 J).
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Journal of Materials Chemistry B features articles on the following:

Biologically responsive, sustainable release from metallo-drug coordinated 1D nanostructures, Naohiro Kameta, Toshimi Shimizu et al.: A multistep self-assembly process produced nanotubes and nanotapes with a ligand that coordinated an anticancer Pt complex. Nanotubes were superior to nanotapes with respect to sustainable release of the drug.

A water-soluble phosphorescent polymer for time-resolved assay and bioimaging of cysteine/homocysteine, Qiang Zhao, Fuyou Li, Wei Huang et al.: A water-soluble phosphorescent bioprobe was successfully developed by introducing an iridium(III) complex as a phosphorescent signaling unit with poly(N-isopropylacrylamide) (PNIPAM) as the stimuli-responsive backbone.

A graphene oxide platform for the assay of DNA 3′-phosphatases and their inhibitors based on hairpin primer and polymerase elongation, Jianhui Jiang, Ruqin Yu et al.: A label-free sensitive GO sensing platform for DNA 3′-phosphatases and their inhibitors, based on a hairpin primer and polymerase elongation.

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Hot paper: First thermodynamically-controlled synthesis of iron pyrite nanocrystals

Iron pyrite (fool’s gold, FeS2) has a high absorption coefficient and an indirect band gap of ~0.95 eV, making it a promising optoelectronic material. FeS2 is also abundant and non-toxic compared to commonly employed chalcogenides semiconductor materials. Photovoltaic investigations into FeS2 have not progressed as quickly as other materials because of its complicated synthesis control and conflicting crystal studies.

In this hot paper the Ren group report the nanoscale synthesis and characteristics of FeS2. The authors systematically change the different synthetic variables in the synthesis such as reaction temperature and chemical precursors. Five different nanocrystal shapes are observed with two different growth directions by controlling both the thermal and chemical precursor effects. The authors propose a thermodynamic model behind the shape-controlled synthesis.

Thermodynamic control of iron pyrite nanocrystal synthesis with high photoactivity and stability
J. Mater. Chem. A, 2013, Advance Article.  DOI: 10.1039/c2ta00498d
(read for free for a short time)

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Journal of Materials Chemistry A, B and C Issue 2’s online now!

The Issue 2’s of Journal of Material Chemistry A, B and C have been published online this week. Each journal showcases high impact research you expect from Journal of Materials Chemistry, now in three separate journals. For more information, please go to http://rsc.li/jmc-abc.

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Journal of Materials Chemistry B features articles on the following:

Design strategies for fluorescent biodegradable polymeric biomaterials, Yi Zhang and Jian Yang: In this paper, we provide a critical review on the fluorescent biodegradable polymers with emphases on material fluorescence mechanism, design criteria for fluorescence, and their cutting-edge applications in biomedical engineering. We expect that this review will provide an insightful discussion on the fluorescent biomaterial design and lead to innovations for the next generation of fluorescent biomaterials and fluorescence-based biomedical technology.

Polyol induced interpenetrating networks: chitosan–methylmethacrylate based biocompatible and pH responsive hydrogels for drug delivery system, Sharif Ahmad et al.: The hydrophobically modified hydrogels of CH–MMA/Polyol were prepared by free radical polymerization reaction. This study has come up with novel characteristics associated with the formation of interpenetrating networks by the introduction of polyol in the CH–MMA matrix..

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Journal of Materials Chemistry C features articles on the following:

Soft X-ray characterisation of organic semiconductor films, Christopher R. McNeill and Harald Ade: This feature article highlights the versatility of soft X-ray based techniques for characterising the structure of organic semiconductor devices.

The visible photoluminescence mechanism of oxidized multi-walled carbon nanotubes: an experimental and theoretical investigation, Hui Feng et al.: Dominant components of oxidized products of MWCNTs were separated by column chromatography, the origin of highly visible fluorescence from carbon nanotubes was revealed, and the nature of weak near UV-Vis fluorescence of oxidized carbon nanotubes from isolated sp2 clusters was supported.

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Journal of Materials Chemistry A features articles on the following:

Engineering nanostructured anodes via electrostatic spray deposition for high performance lithium ion battery application, Xifei Li and Chunlei Wang: ESD-derived nanostructured anodes show significantly improved cycling performance and rate capability in high performance lithium ion battery application.

Controlled synthesis of concave Cu2O microcrystals enclosed by {hhl} high-index facets and enhanced catalytic activity, Zhaoxiong Xie, Lansun Zheng et al.: Truncated concave octahedral Cu2O mainly with {332} high-index facets exhibit enhanced catalytic activity.

Counter electrodes from double-layered polyaniline nanostructures for dye-sensitized solar cell applications, Qunwei Tang et al.: DSSCs from double-layered polyaniline counter electrodes were fabricated by an electrochemical method and can be potentially used as high photoelectric conversion devices.

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Hot paper: Detecting explosives with crystalline frameworks

3D porous aromatic frameworks for explosives detection

For hundreds of years there have been attempts to use explosives for nefarious purposes. Unfortunately, central government can not always rely on mysterious, anonymous letters to prevent their untimely obliteration. A simple, sensitive and reliable means of detecting explosive compounds would not only have security applications; there is also a need to prevent the accidental release of explosive materials into the environment.

In a recent paper, Yuan et al. describe a three-dimensional pourous aromatic framework (PAF) with high-fluorescence quenching ability for nitro-aromatic compounds. As little as 1.5 ppm of an explosive such as TNT (2,4,6-trinitrotoluene) leads to a significant, observable decrease in luminescence intensity. Common aromatics lacking a nitro group elicit no such decrease.

The highly crystalline PAF was formed by a condensation reaction between a germanium-containing, luminescent monomer and aromatic boronic acids. The resulting polymeric framework gives the material a high fluorescence quantum yield that is easily disrupted by interactions with an analyte. The specificity for nitro-aromatics is thought to come from the attraction of electronegative nitro groups to the electron-donating PAF.

Such a sensitive material has enormous potential for use in explosives detection equipment. However, enemies of Jacobean plotters beware! This strategy might not detect gunpowder.

Sensitive detection of hazardous explosives via highly fluorescent crystalline porous aromatic frameworks

J. Mater. Chem., 2012, 22, 24558.  DOI: 10.1039/c2jm35341e

James Serginson is a guest web writer for the Journal of Materials Chemistry blog. He currently works at Imperial College London carrying out research into nanocomposites.

To keep up-to-date with all the latest research, sign-up to our RSS feed or Table of contents alert.

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Introducing the Journal of Materials Chemistry A, B and C Editor-in-Chief and Deputy Editors-in-Chief

Editor-in-Chief, Journal of Materials Chemistry

Dongyuan Zhao was born in Shenyang, Liaoning Province in June 1963. He was a undergraduate student at Jilin University (1980-84), got his Master degree from Chemistry Department at Jilin University (1987), and a Ph.D.degree from Jilin University and Dalin Institute of Chemical Physics (1990). He began his academic career almost immediately as a lecturer in Chemical Engineering Department at the Shenyang Institute of Chemical Technology, and was promoted to an Associate Professor in 1992. In 1992-93, he was a visiting scholar in the Chemistry Department of University of Regina. After postdoctoral research at the Weizmann Institute of Science (with Prof. Daniella Goldfarb, 1993-94), University of Houston (with Prof. Larry Kevan, 1995-96), and University of California at Santa Barbara (with Prof. Galen D. Stucky, 1996-98), he joined the faculty of the Fudan University in Dec.1998, where he is now Professor in the Department of Chemistry. Dr. Zhao‘s research includes:

• Macro- and Microscopically Topological Construction of Highly Ordered Porous Materials

• Designed Synthesis, Assembly, Growth and Properties of Mesoporous Materials

• Structure and Synthesis Design of Novel Microporous Molecular Sieves

…………………………………………………• Rational Synthesis and Organization of Novel Patterned Nanoscale Materials.

His recent papers include:

Ligand exchange triggered controlled-release targeted drug delivery system based on core–shell superparamagnetic mesoporous microspheres capped with nanoparticles, J. Mater. Chem., 2012,22, 17677-17684
Self-assembly of monodispersed silica nano-spheres with a closed-pore mesostructure, J. Mater. Chem., 2012, 22, 11523-11528
Post-enrichment of nitrogen in soft-templated ordered mesoporous carbon materials for highly efficient phenol removal and CO2 capture, J. Mater. Chem., 2012, 22, 11379-11389
A hierarchical adsorption material by incorporating mesoporous carbon into macroporous chitosan membranes, J. Mater. Chem., 2012, 22, 11908-11911

Ordered mesoporous graphitized pyrolytic carbon materials: synthesis, graphitization, and electrochemical properties, J. Mater. Chem., 2012, 22, 8835-8845Dr. Zhao

Deputy Editor-in-Chief, Journal of Materials Chemistry A

Kazuhito Hashimoto is currently a professor of chemistry at the University of Tokyo. After he received his BS and MS degrees from the University of Tokyo, he obtained a research position at the Institute for Molecular Science (Okazaki, Japan) in 1980. In 1989, he was invited as a lecturer in the Department Applied Chemistry at the University of Tokyo, where he was promoted to an associate professor in 1991. When he became a full professor in 1997, he opened his own laboratory at the Research Centre of Advanced Science & Technology. He also succeeded the chair of the Department of Applied Chemistry in 2003 and opened the laboratory at this department, too. His current research interests are development of functionalized materials for energy conversion and environmental purifications such as photocatalysts, polymer photovoltaic materials, electrochemical catalysts and microbial catalysts.

His recent papers include:

Efficient oxygen reduction by a Fe/Co/C/N nano-porous catalyst in neutral media, J. Mater. Chem. A, 2013, Advance Article, DOI: 10.1039/C2TA00392A
Poly(bis-2,6-diaminopyridinesulfoxide) as an active and stable electrocatalyst for oxygen reduction reaction, J. Mater. Chem., 2012, 22, 12263
Synthesis and application of poly(fluorene-alt-naphthalene diimide) as an n-type polymer for all-polymer solar cells, Chem. Commun., 2012,48, 5283-5285

.Deputy Editor-in-Chief, Journal of Materials Chemistry B

Christine E. Schmidt is the B.F. Goodrich Endowed Professor of Materials Engineering in the Departments of Biomedical Engineering and Chemical Engineering at the University of Texas at Austin. Dr. Schmidt received her B.S. degree in Chemical Engineering from the University of Texas at Austin in 1988 and her Ph.D. in Chemical Engineering from The University of Illinois at Urbana-Champaign in 1995. She conducted postdoctoral research at MIT as an NIH Postdoctoral Fellow, joining the UT Austin faculty in 1996. Dr. Schmidt will be moving to the University of Florida to be the J. Crayton Pruitt Family Professor & Department Chair for the J. Crayton Pruitt Family Department of Biomedical Engineering, effective January 1, 2013. Dr. Schmidt’s research is focused on developing new biomaterials and biomaterial composites (e.g., electronic polymer composites, natural material scaffolds and processed tissues) for neural engineering applications.

Her recent papers include:

Neuronal growth promoting sesquiterpene–neolignans; syntheses and biological studies, Org. Biomol. Chem., 2012,10, 383-393

Deputy Editor-in-Chief, Journal of Materials Chemistry C

Peter Skabara was born in Edinburgh in 1968. He was educated at Bolton School and gained his first degree from QMW, University of London. After completing his doctoral studies under the supervision of Professor Martin Bryce at the University of Durham (1994), he went on to work in the group of Professor Klaus Müllen at the Max-Planck Institute for Polymer Research in Mainz. In 2005 he joined the University of Strathclyde as the first WestCHEM Professor and is currently the 1870 Young Chair of Chemistry. His research activities involve the synthesis of electroactive molecules and macromolecules and their application in organic semiconductor devices.

His recent papers include:

BODIPY-based conjugated polymers for broadband light sensing and harvesting applications, J. Mater. Chem., 2012,22, 14119-14126
Electrochromic properties of a poly(dithienylfuran) derivative featuring a redox-active dithiin unit, Polym. Chem., 2012,3, 2277-2286
Incorporation of fused tetrathiafulvalene units in a DPP–terthiophene copolymer for air stable solution processable organic field effect transistors, J. Mater. Chem., 2012,22, 11310-11315

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Journal of Materials Chemistry A, B and C Issue 1’s now online

The first issues of the newly formed Journal of Materials Chemistry A, B and C have been published online! Each journal showcases high impact research you expect from Journal of Materials Chemistry, now in three separate journals. For more information, please go to http://rsc.li/jmc-abc.

Journal of Materials Chemistry A features articles on the following:

Multifunctionality in metal@microgel colloidal nanocomposites, Jorge Pérez-Juste and Luis M. Liz-Marzán et al.: This Highlight describes recent developments related to hybrid nanocomposites comprising a metal core and a smart microgel shell.

Naturally occurring iron oxide nanoparticles: morphology, surface chemistry and environmental stability, Haibo Guo and Amanda S. Barnard : There is much to be learned from the simple and effective materials chemistry of naturally occurring nanomaterials.

Aluminum-stabilized NASICON-structured Li3V2(PO4)3, John B. Goodenough et al.: The redox couple, V4+/V3+, exhibits a potential of 3.76 V in NASICON-structured Li3Al0.1V1.9(PO4)3, which is suitable for a cathode material of a lithium-ion battery.

Importance of small micropores in CO2 capture by phenolic resin-based activated carbon spheres, Nilantha P. Wickramaratne and Mietek Jaroniec: Phenolic resin-based carbon spheres obtained by a slightly modified Stöber method are shown to be superior CO2 adsorbents.

Journal of Materials Chemistry B features articles on the following:

Biomimetic intracellular matrix (ICM) materials, properties and functions. Full integration of actuators and sensors, Toribio F. Otero and Jose G. Martinez: The electrochemistry of conducting polymers, and other organic compounds, originates biomimetic (intracellular matrix, ICM, reactive gels) materials, properties and devices here reviewed.

Cellular uptake and gene delivery using layered double hydroxide nanoparticles, Jun Lu, David G. Evans and Dermot O’Hare: The cellular uptake of fluorescein labelled 20 nm LDH nanoparticles into NSC 34 cells as a function of LDH particle concentration and incubation time was studied. The 20 nm LDH nanoparticles can also act as a DNA delivery agent to NSC 34 cell nuclei.

Biocompatible reduction-responsive polypeptide micelles as nanocarriers for enhanced chemotherapy efficacy in vitro, Xuesi Chen et al.: Biocompatible reduction-responsive micelles of disulfide-linked methoxyl poly(ethylene glycol) and poly(ε-benzyloxycarbonyl-L-lysine) block copolymers were developed for efficient intracellular drug delivery.

Theoretical understanding of single-stranded DNA assisted dispersion of graphene, Swapan K. Pati et al.: Using atomistic molecular dynamics (MD) simulation, we investigate the structure and energetic of single-stranded DNA (ssDNA) assisted solubilisation of single-layer graphene in aqueous medium at room temperature.

Journal of Materials Chemistry C features articles on the following:

Pyroelectric and electrocaloric materials, Q. M. Zhang et al.: This review summarizes typical properties of electrocaloric and pyroelectric materials and discusses related phenomena, and examines the relationship between these effects.

Graphenylene, a unique two-dimensional carbon network with nondelocalized cyclohexatriene units, Klaus Müllen and Linjie Zhi et al.: The unique structure and properties of a new hypothetical two-dimensional sp2-carbon network which is called graphenylene, have been predicted.

A deep-blue emitting charged bis-cyclometallated iridium(III) complex for light-emitting electrochemical cells, Wiebke Sarfert, Enrique Ortí, Michael Grätzel and Etienne Baranoff et al.: A cationic iridium(III) complex based on 2′,6′-difluoro-2,3′-bipyridine shows deep-blue emission in a concentrated film and is used in light-emitting electrochemical cells.

The design and investigation of porphyrins with liquid crystal properties at room temperature, Ross W. Boyle and Georg H. Mehl et al.: Porphyrins linked via hydrocarbon and siloxane spacers to cyanobiphenyls exhibit semectic LC behaviour at room temperature, confirmed by OPM, DSC and XRD.

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C2TC00283C
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Poster prize winners at the 2012 International Symposium on Stimuli-Responsive Materials

Congratulations to the poster prize winners at the 2012 International Symposium on Stimuli-Responsive Materials! The three winners were chosen by an independent panel and they are: Young-Jin Kim (University of Tsukuba), Heather A. Pearson (University of Southern Mississippi) and William L. A. Brooks (University of Florida).

From left to right: Young-Jin Kim, Heather A. Pearson and William L. A. Brooks

Journal of Materials Chemistry Best Poster Award Winner: Young-Jin Kim from Takao Aoyagi’s group
“‘On-Off’ Switchable Drug Release Platform Using Temperature-Responsive Smart Nanofiber”

Soft Matter Best Poster Award Winner: Heather A. Pearson from Marek Urban’s group
“Switchable Polyelectrolyte Tethers on Polymeric Substrates: A New Platform for Covalent Attachment of Multilayers (CAM) with Responsive Bioactive Components”

Polymer Chemistry Best Poster Award Winner:
William L. A. Brooks from Brent Sumerlin’s group
“Accelerated Synthesis of Responsive Polymers by Microwave-Assisted RAFT Polymerization”

The 2012 International Symposium on Stimuli-Responsive Materials was held October 21 – 23 2012 at the Hilton Sonoma Wine Country in Santa Rosa, CA. The symposium covered the design, synthesis, characterization, and understanding of the physical, chemical, and applied principles of stimuli-responsive materials and devices.

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Here’s to the future, J. Mater. Chem. Editorial

The collage of cover images were chosen by editorial staff from previous front cover images of Journal of Materials Chemistry

The last issue of Journal of Materials Chemistry in its current form has been published online this week. Editor Dr Liz Dunn and Chair of the Editorial Board Professor Seth Marder give their thoughts on the past 22 years of Journal of Materials Chemistry and the exciting future of the journal in their Editorial ‘Here’s to the future‘.

Next week, the issue 1’s of the three new journals replacing Journal of Materials Chemistry will be published online. Each journal will focus on an area of the field as follows:

Journal of Materials Chemistry A – Materials for energy and sustainability

Journal of Materials Chemistry B – Materials for biology and medicine

Journal of Materials Chemistry C – Materials for optical and electronic devices

We will shortly be announcing the board members of the new journals, so stay tuned!

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