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Ali Khademhosseini, Warren W C Chan, Manish Chhowalla, Sharon C Glotzer, Yury Gogotsi, Jason H Hafner, Paula T Hammond, Mark C Hersam, Ali Javey, Cherie R Kagan, Nicholas A Kotov, Shuit-Tong Lee, Yan Li, Helmuth Möhwald, Paul A Mulvaney, Andre E Nel, Wolfgang J Parak, Reginald M Penner, Andrey L Rogach, Raymond E Schaak, Molly M Stevens, Andrew T S Wee, Jeffrey Brinker, Xiaoyuan Chen, Lifeng Chi, Michael Crommie, Cees Dekker, Omid Farokhzad, Christoph Gerber, David S Ginger, Darrell J Irvine, Laura L Kiessling, Kostas Kostarelos, Christy Landes, Takhee Lee, Graham J Leggett, Xing-Jie Liang, Luis Liz-Marzán, Jill Millstone, Teri W Odom, Aydogan Ozcan, Maurizio Prato, C N R Rao, Michael J Sailor, Emily Weiss, Paul S Weiss
No abstract text is available yet for this article.
February 15, 2017: ACS Nano
Xiang Liu, Didier Astruc
The properties of two alloyed metals have been known since the Bronze Age to outperform those of a single metal. How alloying and mixing metals applies to the nanoworld is now attracting considerable attention. The galvanic process, which is more than two centuries old and involves the reduction of a noble-metal cation by a less noble metal, has not only been used in technological processes, but also in the design of nanomaterials for the synthesis of bimetallic transition-metal nanoparticles. The background and nanoscience applications of the galvanic reactions (GRs) are reviewed here, in particular with emphasis on recent progress in bimetallic catalysis...
January 27, 2017: Advanced Materials
Dong Wang, Didier Astruc
Whereas noble metal compounds have long been central in catalysis, Earth-abundant metal-based catalysts have in the same time remained undeveloped. Yet the efficacy of Earth-abundant metal catalysts was already shown at the very beginning of the 20th century with the Fe-catalyzed Haber-Bosch process of ammonia synthesis and later in the Fischer-Tropsch reaction. Nanoscience has revolutionized the world of catalysis since it was observed that very small Au nanoparticles (NPs) and other noble metal NPs are extraordinarily efficient...
January 19, 2017: Chemical Society Reviews
Elena Colangelo, Joan Comenge, David Paramelle, Martin Volk, Qiubo Chen, Raphaël Lévy
A key aspect of nanoscience is to control the assembly of complex materials from a "bottom-up" approach. The self-assembly and self-organization of small ligands at the surface of nanoparticles represent a possible starting route for the preparation of (bio)nanomaterials with precise (bio)physical and (bio)chemical properties. However, surface characterization and elucidation of the structure-properties relationship, essential to envisioning such control, remain challenging and are often poorly investigated...
January 18, 2017: Bioconjugate Chemistry
Manuela Malatesta
During the last twenty years, the research in nanoscience and nanotechnology has dramatically increased and, in the last decade, the interest has progressively been oriented towards biomedical applications, giving rise to a new field termed nanomedicine. Transmis - sion electron microscopy is a valuable technique not only for the thorough physico-chemical characterization of newly synthesized nanoparticulates, but especially to explore the effects of nanocomposites on biological systems, providing essential information for the development of efficient therapeutic and diagnostic strategies...
December 9, 2016: European Journal of Histochemistry: EJH
Peng Wang, Xuan Qi, Xuemin Zhang, Tieqiang Wang, Yunong Li, Kai Zhang, Shuang Zhao, Jun Zhou, Yu Fu
This work has mainly investigated the influence of the solvent on the nanoparticles distribution in digestive ripening. The experiments suggested that the solvents played a key role in digestive ripening of Au nanoparticles (Au NPs). For the benzol solvents, the resulting size distribution of Au NPs was inversely related to the solvent polarity. It may be interpreted by the low Gibbs free energy of nanoparticles in the high polarity medium, which was supposedly in favor of reducing the nanoparticles distribution...
December 2017: Nanoscale Research Letters
Linjia Su, Song Hu, Li Zhang, Zhuoran Wang, Weiping Gao, Jing Yuan, Minghua Liu
The synthesis and surface modification of gold nanorods (GNRs) is one of the most important and basic issues in nanoscience. Most of the widely investigated GNRs are coated with a cetyltrimethylammonium bromide(CTAB) bilayer. Here, a highly efficient method is proposed to replace CTAB from the surface of GNRs with a bifunctional 11-mercaptoundecanoic acid in order to decrease the possible toxicity caused by CTAB. This ligand exchange is achieved in a biphasic mixture of an aqueous solution and a water-immiscible ionic liquid (IL), [BMIM][Tf2 N]...
January 9, 2017: Small
Cong Yan, Tie Wang
Studies on nanoparticle assemblies and their applications have been research frontiers in nanoscience in the past few decades and remarkable progress has been made in the synthetic strategies and techniques. Recently, the design and fabrication of the nanoparticle-based nanomaterials or nanodevices with integrated and enhanced properties compared to those of the individual components have gradually become the mainstream. However, a systematic solution to provide a big picture for future development and guide the investigation of different aspects of the study of nanoparticle assemblies remains a challenge...
January 6, 2017: Chemical Society Reviews
Hongwei Wu, Yunyun Zhou, Liyuan Yin, Cheng Hang, Xin Li, Hans Ågren, Tao Yi, Qing Zhang, Liangliang Zhu
In nanoscience, chirality has shown a significant ability to tune materials' electronic properties, whereas imposing macrochirality into the regulation of singlet-triplet features of organic optoelectronics remains a challenging research topic. Since the tuning for singlet and triplet excited-state properties in a single π-functional molecule connects to its multicolor luminescent application and potential improvement of internal quantum efficiency, we here report that supramolecular chirality can be employed to toggle the singlet and triplet emissions in a well-designed asterisk-shaped molecule...
January 18, 2017: Journal of the American Chemical Society
Warren W C Chan, Manish Chhowalla, Sharon Glotzer, Yury Gogotsi, Jason H Hafner, Paula T Hammond, Mark C Hersam, Ali Javey, Cherie R Kagan, Ali Khademhosseini, Nicholas A Kotov, Shuit-Tong Lee, Yan Li, Helmuth Möhwald, Paul A Mulvaney, Andre E Nel, Peter J Nordlander, Wolfgang J Parak, Reginald M Penner, Andrey L Rogach, Raymond E Schaak, Molly M Stevens, Andrew T S Wee, C Grant Willson, Laura E Fernandez, Paul S Weiss
No abstract text is available yet for this article.
December 27, 2016: ACS Nano
Shakeel Ahmed Ansari, Rukhsana Satar, Asma Perveen, Ghulam Md Ashraf
PURPOSE OF REVIEW: Nanotechnology typically deals with the measuring and modeling of matter at nanometer scale by incorporating the fields of engineering and technology. The most prominent feature of these engineered materials involves their manipulation/modification for imparting new functional properties. The current review covers the most recent findings of Alzheimer's disease (AD) therapeutics based on nanoscience and technology. RECENT FINDINGS: Current studies involve the application of nanotechnology in developing novel diagnostic and therapeutic tools for neurological disorders...
March 2017: Current Opinion in Psychiatry
Fang Peng, Qi Wang, Rongjia Shi, Zeyi Wang, Xin You, Yuhong Liu, Fenghe Wang, Jay Gao, Chun Mao
A novel and efficient catalyst is one of the goals in the material field, and the involvement of nanoscience and technology has brought new vigor to the development of catalyst. This research aimed to develop a simple two-step route to fabricate Fe3O4@PS/PDA-Ag hybridnanotubes with size-controllable and highly dispersed silver nanoparticles (NPs). First, Fe3O4@PS nanotubes of a sound mechanical property were prepared using polystyrene (PS)/toluene solution containing highly dispersed oleic acid modified Fe3O4 particles in a commercial AAO template...
December 21, 2016: Scientific Reports
Jwa-Min Nam, Jeong-Wook Oh, Haemi Lee, Yung Doug Suh
Plasmonic coupling-based electromagnetic field localization and enhancement are becoming increasingly important in chemistry, nanoscience, materials science, physics, and engineering over the past decade, generating a number of new concepts and applications. Among the plasmonically coupled nanostructures, metal nanostructures with nanogaps have been of special interest due to their ultrastrong electromagnetic fields and controllable optical properties that can be useful for a variety of signal enhancements such as surface-enhanced Raman scattering (SERS)...
20, 2016: Accounts of Chemical Research
Luciano Levin, Pablo Jensen, Pablo Kreimer
How do different countries tackle nanoscience research? Are all countries similar except for a trivial size effect, as science is often assumed to be universal? Or does size dictate large differences, as large countries are able to develop activities in all directions of research, while small countries have to specialize in some specific niches? Alternatively, is size irrelevant, as all countries have followed different historical paths, leading to different patterns of specialisation? Here, we develop an original method that uses a bottom-up definition of scientific subfields to map the international structure of any scientific field...
2016: PloS One
Shuit-Tong Lee, Lifeng Chi
No abstract text is available yet for this article.
December 2016: Advanced Materials
Alexandru Zabara, Thomas G Meikle, Janet Newman, Thomas S Peat, Charlotte E Conn, Calum J Drummond
The structural changes occurring at the nanoscale level within the lipid bilayer and driving the in-meso formation of large well-diffracting membrane protein crystals have been uniquely characterized for a model membrane protein, intimin. Importantly, the order to order transitions taking place within the bilayer and the lipidic nanostructures required for crystal growth have been shown to be general, occurring for both the cubic and the sponge mesophase crystallization pathways. For the first time, a transient fluid lamellar phase has been observed and unambiguously assigned for both crystallization pathways, present at the earliest stages of protein crystallogenesis but no longer observed once the crystals surpass the size of the average lyotropic liquid crystalline domain...
December 15, 2016: Nanoscale
Ivo S Vinklárek, Marek Scholz, Roman Dědic, Jan Hála
Delayed fluorescence (DF) of protoporphyrin IX (PpIX) has been recently proposed as a tool for monitoring of mitochondrial oxygen tension in vivo as well as for observation of the effectiveness of photodynamic therapy (PDT) [E. G. Mik, Anesth. Analg., 2013, 117, 834-346; F. Piffaretti et al., J. Biomed. Opt., 2012, 17, 115007]. However, the efficiency of the mechanism of thermal activation (E-type DF), which was considered in the papers, is limited due to a large energy gap between the first excited singlet and the first triplet state of PpIX at room or body temperatures...
December 12, 2016: Photochemical & Photobiological Sciences
Bat-El Pinchasik, Michael Kappl, Hans-Jürgen Butt
Designing materials for water harvesting has gained much attention in recent years as water scarcity continues to be one of the biggest problems facing mankind. In this issue of ACS Nano, Xu et al. propose a new device for harvesting water from fog. They use conically shaped copper wires with periodic roughness to enhance condensation and transport of water drops. While the periodic roughness enhances drop coalescence and motion, the conical shape of the wires guides the drops in a specific direction. Together, a self-sustained water-harvesting system is described which does not require additional external stimulus but makes use of a smart design and economic production...
December 27, 2016: ACS Nano
Sepideh Vahabi, Ali Eatemadi
The systemic administration of opioids leads to potentially severe and undesirable and side effects like sedation and drowsiness, vomiting and nausea, allergies, respiratory depression, and neutrophil dysfunction. The application of nanotechnology in medical field has drawn a great attention in recent times. Several treatments available are tedious and expensive. Application of nanotechnology brings about faster cure and cost effectiveness. Nanoliposomes are one of the widely used names for nanoparticles used in medicine...
February 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Claudia Stauch, Thomas Ballweg, Werner Stracke, Robert Luxenhofer, Karl Mandel
Despite immense progress in nanoscience and technology, one of the yet unsolved challenges is the redispersion of nanoparticles from dry powders back to the individual, primary particles. Herein, an easy to handle powder consisting of nanostructured micron sized raspberry-like particles is presented. These nanostructured micro-raspberries are composed of individual nanoparticles which are equipped with molecules that introduce a separating effect or "spring" functionality. Thereby, a powder system is obtained that allows for an easy and complete redispersibility of the agglomerates down to the level of individual nanoparticles in solvents and polymers...
March 15, 2017: Journal of Colloid and Interface Science
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