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Nanochemistry

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https://www.readbyqxmd.com/read/29144761/amphiphiles-without-head-and-tail-design-nanostructures-based-on-the-self-assembly-of-anionic-boron-cluster-compounds
#1
Roberto Fernandez-Alvarez, Vladimír Ďorďovič, Mariusz Uchman, Pavel Matejicek
Anionic boron hydride cluster compounds (ABCCs) are intrinsically amphiphilic building blocks suitable for nanochemistry. ABCCs are involved in atypical weak interactions, notably dihydrogen bonding, due to their peculiar polyhedral structure, consisting of negatively charged B-H units. The most striking feature of ABCCs that differentiates them from typical surfactants is the lack of head-and-tail structure. Furthermore, their structure can be described as intrinsically amphiphilic or aquaneutral. Therefore, classical terms established to describe self-assembly of classical amphiphiles are insufficient and need to be reconsidered...
November 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29070592/enamel-crystallite-strength-and-wear-nanoscale-responses-of-teeth-to-chewing-loads
#2
Jing Xia, Z Ryan Tian, Licheng Hua, Lei Chen, Zhongrong Zhou, Linmao Qian, Peter S Ungar
The nanoscale responses of teeth to chewing loads are poorly understood. This has contributed to debate concerning the aetiology of enamel wear and resistance to fracture. Here we develop a new model for reactions of individual hydroxyapatite nanofibres to varying loads and directions of force. Hydroxyapatite nanofibres, or crystallites, composed of chains of bonded nanospheres, are the fundamental building blocks of enamel. This study indicates that these nanofibres respond to contact pressure in three distinct ways depending on force magnitude and direction: (i) plucking (nanosphere loss when the strength of the bonding protein 'glue' is exceeded), (ii) plastic deformation (compression to gradually bend nanofibres and squeeze the protein layer), and (iii) fragmentation (nanofibres fracture when the strength of H-bonds that bind smaller nanoparticles into nanospheres is exceeded)...
October 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29051865/photothermal-catalyst-engineering-hydrogenation-of-gaseous-co2-with-high-activity-and-tailored-selectivity
#3
Jia Jia, Hong Wang, Zhuole Lu, Paul G O'Brien, Mireille Ghoussoub, Paul Duchesne, Ziqi Zheng, Peicheng Li, Qiao Qiao, Lu Wang, Alan Gu, Abdinoor A Jelle, Yuchan Dong, Qiang Wang, Kulbir Kaur Ghuman, Thomas Wood, Chenxi Qian, Yue Shao, Chenyue Qiu, Miaomiao Ye, Yimei Zhu, Zheng-Hong Lu, Peng Zhang, Amr S Helmy, Chandra Veer Singh, Nazir P Kherani, Doug D Perovic, Geoffrey A Ozin
This study has designed and implemented a library of hetero-nanostructured catalysts, denoted as Pd@Nb2O5, comprised of size-controlled Pd nanocrystals interfaced with Nb2O5 nanorods. This study also demonstrates that the catalytic activity and selectivity of CO2 reduction to CO and CH4 products can be systematically tailored by varying the size of the Pd nanocrystals supported on the Nb2O5 nanorods. Using large Pd nanocrystals, this study achieves CO and CH4 production rates as high as 0.75 and 0.11 mol h(-1) gPd(-1), respectively...
October 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29049882/plasmonic-nanochemistry-based-on-nanohole-array
#4
Bin Ai, Zengyao Wang, Helmuth Möhwald, Gang Zhang
We show that the growth of Ag nanoparticles (NPs) follows the areas of maximum plasmonic field in nanohole arrays (NAs). We thus obtain Ag NP rings not connected to the metallic rim of the nanoholes. The photocatalytic effect resulting from the enhanced E-field of NAs boosts the reaction and is responsible for the site selectivity. The strategy, using plasmonics to control a chemical reaction, can be expanded to organic reactions, for example, synthesis of polypyrrole. After the NA film is removed, ordered ring-shaped Ag NPs are easily obtained, inspiring a facile micropatterning method...
October 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/29030559/understanding-seed-mediated-growth-of-gold-nanoclusters-at-molecular-level
#5
Qiaofeng Yao, Xun Yuan, Victor Fung, Yong Yu, David Tai Leong, De-En Jiang, Jianping Xie
The continuous development of total synthesis chemistry has allowed many organic and biomolecules to be produced with known synthetic history-that is, a complete set of step reactions in their synthetic routes. Here, we extend such molecular-level precise reaction routes to nanochemistry, particularly to a seed-mediated synthesis of inorganic nanoparticles. By systematically investigating the time-dependent abundance of 35 intermediate species in total, we map out relevant step reactions in a model size growth reaction from molecularly pure Au25 to Au44 nanoparticles...
October 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/28945412/toward-cost-effective-and-sustainable-use-of-precious-metals-in-heterogeneous-catalysts
#6
Younan Xia, Xuan Yang
Waste not, want not. There is a pressing need to maximize the use of precious metals in catalysts to attain affordable and sustainable products. Recent progress in nanochemistry suggests that it is feasible to put the majority of metal atoms in a catalytic particle to work at optimal activity and selectivity.
March 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28719073/our-contributions-in-nanochemistry-for-antibiosis-electrocatalyst-and-energy-storage-materials
#7
REVIEW
Jian Zhang, Jing Xu, Yan Wang, Huaiguo Xue, Huan Pang
This account mainly introduces and reviews our recent progress in three projects: antibacterial nanomaterial, electrocatalyst for detecting and electrode nanomaterial of energy storage device, especially the supercapacitor. Besides, our thought and idea about the design, fabrication and application of corresponding nanomaterials are sketched throughout the whole article in order to reveal the structure-function relationship and corresponding mechanism. In the end, we tend to attach importance to the bottleneck of nanomaterial's development and put forward our understanding in this field...
July 18, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28661129/supernormal-conversion-anode-consisting-of-high-density-mos2-bubbles-wrapped-in-thin-carbon-network-by-self-sulfuration-of-polyoxometalate-complex
#8
Peiyuan Wang, Jing Tian, Jiulin Hu, Xuejun Zhou, Chilin Li
Large-capacity conversion electrodes are highly required to raise the energy density of batteries. However, their undesired phase segregation and volume expansion during cycling lead to the motivation for nanofabrication and nanochemistry of active species in order to decrease "dead mass" and promote better construction of conductive networks. However, the inactivity of the conductive skeleton and loose nanostructure would compromise the energy density of the electrode. The integration of large-sized (high-density) grains into an electroactive conductive network in a compact way is still a big challenge...
July 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28572706/electroactive-nanoporous-metal-oxides-and-chalcogenides-by-chemical-design
#9
Christopher H Hendon, Keith T Butler, Alex M Ganose, Yuriy Román-Leshkov, David O Scanlon, Geoffrey A Ozin, Aron Walsh
The archetypal silica- and aluminosilicate-based zeolite-type materials are renowned for wide-ranging applications in heterogeneous catalysis, gas-separation and ion-exchange. Their compositional space can be expanded to include nanoporous metal chalcogenides, exemplified by germanium and tin sulfides and selenides. By comparison with the properties of bulk metal dichalcogenides and their 2D derivatives, these open-framework analogues may be viewed as three-dimensional semiconductors filled with nanometer voids...
April 25, 2017: Chemistry of Materials: a Publication of the American Chemical Society
https://www.readbyqxmd.com/read/28560348/molecular-surgery-on-a-23-gold-atom-nanoparticle
#10
Qi Li, Tian-Yi Luo, Michael G Taylor, Shuxin Wang, Xiaofan Zhu, Yongbo Song, Giannis Mpourmpakis, Nathaniel L Rosi, Rongchao Jin
Compared to molecular chemistry, nanochemistry is still far from being capable of tailoring particle structure and functionality at an atomic level. Numerous effective methodologies that can precisely tailor specific groups in organic molecules without altering the major carbon bones have been developed, but for nanoparticles, it is still extremely difficult to realize the atomic-level tailoring of specific sites in a particle without changing the structure of other parts (for example, replacing specific surface motifs and deleting one or two metal atoms)...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28497789/underwater-leidenfrost-nanochemistry-for-creation-of-size-tailored-zinc-peroxide-cancer-nanotherapeutics
#11
Mady Elbahri, Ramzy Abdelaziz, Duygu Disci-Zayed, Shahin Homaeigohar, Justyna Sosna, Dieter Adam, Lorenz Kienle, Torben Dankwort, Moheb Abdelaziz
The dynamic underwater chemistry seen in nature is inspiring for the next generation of eco-friendly nanochemistry. In this context, green synthesis of size-tailored nanoparticles in a facile and scalable manner via a dynamic process is an interesting challenge. Simulating the volcano-induced dynamic chemistry of the deep ocean, here we demonstrate the Leidenfrost dynamic chemistry occurring in an underwater overheated confined zone as a new tool for customized creation of nanoclusters of zinc peroxide. The hydrodynamic nature of the phenomenon ensures eruption of the nanoclusters towards a much colder region, giving rise to growth of monodisperse, size-tailored nanoclusters...
May 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28363025/channeling-through-two-stacked-guanine-quartets-of-one-and-two-alkali-cations-in-the-li-na-k-and-rb-series-assessment-of-the-accuracy-of-the-sibfa-anisotropic-polarizable-molecular-mechanics-potential
#12
Nohad Gresh, Sehr Naseem-Khan, Louis Lagardère, Jean-Philip Piquemal, Judit E Sponer, Jiri Sponer
Stacking of guanine quartets (GQs) can trigger the formation of DNA or RNA quadruple helices, which play numerous biochemical roles. The GQs are stabilized by alkali cations, mainly K(+) and Na(+), which can reside in, or channel through, the central axis of the GQ stems. Further, ion conduction through GQ wires can be leveraged for nanochemistry applications. G-quadruplex systems have been extensively studied by classical molecular dynamics (MD) simulations using pair-additive force fields or by quantum-chemical (QC) calculations...
April 13, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28211697/benchmarking-density-functionals-for-chemical-bonds-of-gold
#13
Kasper P Kepp
Gold plays a major role in nanochemistry, catalysis, and electrochemistry. Accordingly, hundreds of studies apply density functionals to study chemical bonding with gold, yet there is no systematic attempt to assess the accuracy of these methods applied to gold. This paper reports a benchmark against 51 experimental bond enthalpies of AuX systems and seven additional polyatomic and cationic molecules. Twelve density functionals were tested, covering meta functionals, hybrids with variable HF exchange, double-hybrid, dispersion-corrected, and nonhybrid GGA functionals...
February 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27812592/designed-synthesis-and-surface-engineering-strategies-of-magnetic-iron-oxide-nanoparticles-for-biomedical-applications
#14
REVIEW
Wei Wu, Chang Zhong Jiang, Vellaisamy A L Roy
Iron oxide nanoparticles (NPs) hold great promise for future biomedical applications because of their magnetic properties as well as other intrinsic properties such as low toxicity, colloidal stability, and surface engineering capability. Numerous related studies on iron oxide NPs have been conducted. Recent progress in nanochemistry has enabled fine control over the size, crystallinity, uniformity, and surface properties of iron oxide NPs. This review examines various synthetic approaches and surface engineering strategies for preparing naked and functional iron oxide NPs with different physicochemical properties...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27763764/extraordinary-off-stoichiometric-bismuth-telluride-for-enhanced-n-type-thermoelectric-power-factor
#15
Kunsu Park, Kyunghan Ahn, Joonil Cha, Sanghwa Lee, Sue In Chae, Sung-Pyo Cho, Siheon Ryee, Jino Im, Jaeki Lee, Su-Dong Park, Myung Joon Han, In Chung, Taeghwan Hyeon
Thermoelectrics directly converts waste heat into electricity and is considered a promising means of sustainable energy generation. While most of the recent advances in the enhancement of the thermoelectric figure of merit (ZT) resulted from a decrease in lattice thermal conductivity by nanostructuring, there have been very few attempts to enhance electrical transport properties, i.e., the power factor. Here we use nanochemistry to stabilize bulk bismuth telluride (Bi2Te3) that violates phase equilibrium, namely, phase-pure n-type K0...
October 20, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27740664/electron-microscopy-reveals-a-soluble-hybrid-network-of-individual-nanocrystals-self-anchored-by-bifunctional-thiol-fluorescent-bridges
#16
Roberto Matassa, Giuseppe Familiari, Ezio Battaglione, Concita Sibilia, Grigore Leahu, Alessandro Belardini, Iole Venditti, Laura Fontana, Ilaria Fratoddi
Today, nanochemistry research of hybrid materials growth in liquid media represents a new challenge for tailoring specific nano-sized materials directly related to the hybrid electron-optical properties. Distinctive assumptions about the origin, the growth, and the functionalization of hybrid nanoparticles have recently been proposed by scientific research to attend the different aspects of observable behaviors. Therefore, appropriate morpho-structural observation of the hybrid nanoparticles is the most important factor for controlling the chemical and physical properties...
October 27, 2016: Nanoscale
https://www.readbyqxmd.com/read/27588432/optical-excitation-of-carbon-nanotubes-drives-localized-diazonium-reactions
#17
Lyndsey R Powell, Yanmei Piao, YuHuang Wang
Covalent chemistries have been widely used to modify carbon nanomaterials; however, they typically lack the precision and efficiency required to directly engineer their optical and electronic properties. Here, we show, for the first time, that visible light which is tuned into resonance with carbon nanotubes can be used to drive their functionalization by aryldiazonium salts. The optical excitation accelerates the reaction rate 154-fold (±13) and makes it possible to significantly improve the efficiency of covalent bonding to the sp(2) carbon lattice...
September 15, 2016: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/27548159/quantum-nanochemistry-5-volume-set-by-mihai-v-putz
#18
REVIEW
Petr Čársky
This book, with its 2889 pages in five volumes, represents an impressive piece of work written by a single author.[...].
August 19, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27489854/nanochemistry-of-protein-based-delivery-agents
#19
REVIEW
Subin R C K Rajendran, Chibuike C Udenigwe, Rickey Y Yada
The past decade has seen an increased interest in the conversion of food proteins into functional biomaterials, including their use for loading and delivery of physiologically active compounds such as nutraceuticals and pharmaceuticals. Proteins possess a competitive advantage over other platforms for the development of nanodelivery systems since they are biocompatible, amphipathic, and widely available. Proteins also have unique molecular structures and diverse functional groups that can be selectively modified to alter encapsulation and release properties...
2016: Frontiers in Chemistry
https://www.readbyqxmd.com/read/27460290/press-printed-conductive-carbon-black-nanoparticle-films-for-molecular-detection-at-the-microscale
#20
Flavio Della Pelle, Luis Vázquez, Michele Del Carlo, Manuel Sergi, Dario Compagnone, Alberto Escarpa
Carbon black nanoparticle (CBNP) press-transferred film-based transducers for the molecular detection at the microscale level were proposed for the first time. Current-sensing atomic force microscopy (CS-AFM) revealed that the CBNP films were effectively press-transferred, retaining their good conductivity. A significant correlation between the morphology and the resistance was observed. The highest resistance was localized at the top of the press-transferred film protrusions, whereas low values are usually obtained at the deep crevices or grooves...
August 26, 2016: Chemistry: a European Journal
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