This week in Nano: Week 7(Feb 9th-Feb 15th)

An overview of a very specific application of nanomaterials was recently highlighted by a nice article in Nanowerk: ‘Nanotechnology andnanomaterials for camouflage and stealth applications’ This article  highlights nanomaterials as one of the emerging materials suitable for 'multi-spectral camouflage/stealth applications owing to their response to electromagnetic radiation of different energies'. They also highlight that the stealth coating technology mimics the active camouflage used by the squid. 

 

More applications of nanomaterials: A paper was published by PetroleumScience and Technology recently investigating the application of nanomaterials to boost oil extraction. The paper describes the use of fumed silica (AEROSIL® 200) to prevent adsorption of surfactant on reservoir rocks during oil extraction. Surfactant is injected into site during oil extraction to change properties of the reservoir rock and fluid and thus making extraction easier. Adsorption of the surfactant on the surface of reservoir rock is a problem during oil extraction. This paper investigates this issue examining the use of Aerosil 200 prevent the adsorption of surfactant on the reservoir rock.  The article is pay walled so can’t see if it was nano silica or what exactly the material was but the news article can be found here.

To end this weeks nano reading the nanotox paper (published Jan 2015) Toxicity of particulate matter from incineration of nanowaste (open access) is worth highlighting.  The paper exams oxidative potential (as measured by reactive oxygen species consumption of ascorbic acid, dithiothreitol, glutathione, or uric acid antioxidants) and toxicity (as measured by cytotoxicity and genotoxicity of PM to A549 human lung epithelial cells) of PM resulting from the incineration of pure nanomaterials and of paper and plastic wastes containing Ag, NiO, TiO₂, ceria, C₆₀, Fe₂O₃, or CdSe/ZnS quantum dots (CdSe QD). The results reported that in most cases ( see paper)  the presence of nanomaterials in the waste did not significantly affect the oxidation potential of the PM and did not significantly modify the cytotoxicity or genotoxicity of the PM.

This week in Nano: Week 6 (Feb 2nd-Feb 8th)

Researchers reported in Nature Communications this week that they have educated the three-dimensional shape and orientation of individual nanoparticles using X-ray free-electron lasers (located at the national research center in Germany). These types of advances in NM characterisation methods could lead to allowing direct observation of changes in NP structure. Read more here.

NanoSafePack: 'Safe Handling and Use of Nanoparticles in Packaging'- a project (funded under the EU’s FP7) which aims to develop a best practices guide for the safe handling and use of nanomaterials  have released a 'Best Practice Guide for the Safe Handling and Use of Nanoparticles in Packaging Industries'. This guide is intended to support those working with nanomaterials. The ‘NanoSafePack can be downloaded here. The data comes from a complete hazard and exposure assessment conducted on NM in conjunction with polymer matrices (nanocomposites).

GoogleX (the life science department of Google) have developed a fake skin as part of it's ongoing work with nanomaterials: 

This week in Nano: Week 5 (Jan 26th-Feb 1st)

Nanohybrids: Pure nanoparticles of one type are not only difficult to isolate, synthesize and characterize, but also have limited use.  Increasingly  nanomaterial’s are found as  ‘nanohybrids’ (NH) i.e two moieties combined in the nano/molecular scale. Not to be confused with a nanocomposites - NH’s offers unique properties not inherent in either of the parent components. A recent article published in Environmental Nano discusses the distinctive environmental risks these materials pose while proposing a strategy for focusing research efforts on relevant NH systems.

Controlling nanowire growth has always been a challenge in NM synthesis. Recently scientists from the Berkeley National Lab demonstrated a novel technique for growing nanowires that promises 'a new means of control over their light-emitting and electronic properties'. Reported in NANOletters see the release from the Berkley labs here. 

(Image from: http://newscenter.lbl.gov/2015/02/05/precision-growth-light-emitting-nanowires/)

This week in Nano: Week 4(Jan 19th- Jan 25th)

This week sees a publication (AdvancedMaterials) of a paper reporting a nanoparticle designed by researchers from University at Buffalo that can be detected by six medical imaging techniques! Yes you heard right. That is 6. Termed hypermodal imaging or hexamodal imaging the particle can be detected by:

1-Computed tomography (CT) scanning

2- Positron emission tomography (PET) scanning

3- Photoacoustic imaging

4- Upconversion imaging

5- Fluorescence imaging

6- Cerenkov luminescence imaging 

With no instrument currently available that can actually measure these 6 things at once and with waiting lists for a regular CT scan at my local hospital being 1 year I hope never to have my doctor mention this diagnostic technique. Of course I do hope it will spur on the invention of new diagnostic tools. 

Nanomaterials as anti cancer drugs. A study reported in ACS nano from Radboud University has shown a nonmaterial loaded with a sialic acid-blocking glycomimetic successfully prevents cancer metastasis in mice. In other words packing nanomaterials with this drug targeted to cancer cells and injecting them into mice in a lab study has been successful for preventing the spread of cancer in the mice.

They may not be nanosized but this week’s story on micromotors cant be left out! I have just tweeted a moving image of the micromotors in action from ACS nano (RT from compound Interest). Researchers have demonstrated a simple micromotor (zinc based)  that can propel itself inside the body of a mouse. When introduced into a mouse’s stomach, the micromotor moves to the stomach lining,  the body of the motors gradually dissolves in the gastric acid, autonomously releasing their cargo. Sounds like science fiction - but it is science fact. Read all about it here.

This week in Nano Week 3 (Jan 12- Jan 18th)

Welcome to the world of nanocrystals. What are nanocrystals I hear you say - well simply put they are nanomaterials composed of  atoms in a single/poly-crystalline arrangement. A research paper published by JACS called ’Decoding the Superlatticeand Interface Structure of Truncate PbS Nanocrystal-Assembled Supercrystal andAssociated Interaction Forces’ published this week (paywalled) looks at the structure of individual nanocrystals  and larger ‘supercrystals’ grown in the lab with electron microscopy. Given that characterisation of these types of structures are more complex than spheres and their wide range of applications (e.g. medicine and electronic) it is a good step forward for those involved with NM design and crystal formation.

Discovered a nice new website called The Future of Things (TFOT). There are ‘dedicated to bringing unique and fun content on science, technology, and medicine to the general public’. This article on the recently published paper investigating how silicon dioxide nanoparticles increase atherogenicity gives a very good overview not only on the paper itself but also on nanomaterials and atherosclerosis

Phototherapy+nanoparticles= improved identification and surgical removal of malignant tumours. Read all about the current work from the Ohio State University here.

This week in Nano Week 2 (Jan 5th - 11th)

Those working with products that use silica-based nanoparticles (chip makers those working with drug delivery or medical diagnostics) may be interested to read the paper out this week looking at increased cardiovascular risk and silicon dioxide NP exposure. Published in Environmental Toxicology the showed NP exposure was linked to pro-atherogenic effects (in vitro study/macrophages). They measured LDH release (cytotoxicity), increased oxidative stress and triglyceride accumulation. The original research paper can be found (paywalled) here and an article about this article can be found here.

 

A study has been published demonstrating how pulmonary immunization (inhaled vaccination) may be more effective when protein-loaded nanoparticles are synthesized with a positive surface charge. This study published by PNAS and accessible here (paywalled) shows how the positively charged NP induced antibody responses following pulmonary administration, whereas negatively charged nanoparticles did not. 

The mystery surrounding why grephene oxide (GO) were highly stable in water has been solved! Just a case of contamination during preparation of GO. This is a nice article entitled’ Freshmen-levelchemistry solves the solubility mystery of graphene oxide films ‘ from physics.org.