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nano chemistry

Nadav Amdursky, Eric Daniel Głowacki, Paul Meredith
The conduction of ions and electrons over multiple length scales is central to the processes that drive the biological world. The multidisciplinary attempts to elucidate the physics and chemistry of electron, proton, and ion transfer in biological charge transfer have focused primarily on the nano- and microscales. However, recently significant progress has been made on biomolecular materials that can support ion and electron currents over millimeters if not centimeters. Likewise, similar transport phenomena in organic semiconductors and ionics have led to new innovations in a wide variety of applications from energy generation and storage to displays and bioelectronics...
October 17, 2018: Advanced Materials
Pierre-Etienne Rouet, Cyril Chomette, Etienne Duguet, Serge Ravaine
We demonstrate a simple method to create a variety of silica-based colloidal molecules through the covalent assembly of site-specifically functionalized patchy nano-particles with complementary nanospheres. Colloidal analogues of BeBr2, BBr3 and CBr4 are obtained from sp-, sp2- and sp3-like particles, while Br2O and NBr3 analogues can be fabricated by varying the relative amounts of both colloidal precursors. We also show that it is possible to attach covalently silica nanospheres of various sizes to one central patchy nanoparticle, which leads to the formation of more complex colloidal molecules, including chiral ones...
October 11, 2018: Angewandte Chemie
Afsar Khan, Rabia Hameed
One of the major goals of computational chemists is to determine and develop the pathways for anticancer drug discovery and development. In recent past, high performance computing systems threw the light to elicit our desired results, with little or no side effects. Different approaches to facilitate anticancer drug discovery include determination of actual targets, multi-targeted drug discovery, ligand-protein inverse docking, virtual screening of drug like compounds, formation of di-nuclear analogs of drugs, drug specific nano-carrier design, kinetic and trapping studies in drug design, multi-target QSAR model, targeted co-delivery of anticancer drug and siRNA, formation of stable inclusion complex, determination of mechanism of drug resistance, and designing drug like libraries for the prediction of drug-like compounds...
October 9, 2018: Anti-cancer Agents in Medicinal Chemistry
Alan Miralrio, Luis E Sansores, Bruce King, Alvaro Muñoz-Castro
The isolated-pentagon-rule (IPR) is a prime determinant of fullerene stabilization accounting for the difficult isolation of hollow Cn (n < 60) species. In this connection, the isolation and structural characterization of D5h-C50Cl10 as an IPR-violating fullerene are of interest owing to the study of factors providing further stability. Herein, we use DFT calculations to explore its aromatic behavior. In this connection the C50Cl10 structure is considered as a fullerene displaying a planar-aromatic character provided by the face-to-face disposition of two IPR structural motifs, mediated by ten exobonded sp3-carbons...
October 10, 2018: Physical Chemistry Chemical Physics: PCCP
Dwadasi Balarama Sridhar, Rakesh Gupta, Beena Rai
Gold nanoparticles (AuNP) are being used in a variety of applications ranging from drug delivery systems to nano-coolants. The structure and surface properties of AuNP can be manipulated using coatings of thiols, carrying different charges. Different densities of surface coverage can result in the formation of different structures. A molecular basis to quantify the interactions between AuNP covered with different densities (20, 60 and 100%) of surface coverage and various thiol chains (neutral, cationic and anionic) is obtained using potential of mean force (PMF) calculations...
October 17, 2018: Physical Chemistry Chemical Physics: PCCP
Mircea Vasile Diudea, Claudiu Nicolae Lungu, Csaba Levente Nagy
Rhombellanes represent a new class of structures, of which homeomorphs may be synthesized as real molecules. Cube-rhombellane is a double-shell structure, with vertices of degree 3 and 6, respectively. Several hypothetical structures/molecules were proposed and computed using molecular graph theory and coordination chemistry principles. Some geometries were optimized at the B3LYP/6-31G (d, p ) level of theory, followed by harmonic vibrational frequency analysis at the same level of theory, single point data were collected in view of molecular stability evaluation...
October 4, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Łukasz Lamch, Agata Pucek, Julita Kulbacka, Michał Chudy, Elżbieta Jastrzębska, Katarzyna Tokarska, Magdalena Bułka, Zbigniew Brzózka, Kazimiera A Wilk
This up-to-date review summarizes the design and current fabrication strategies that have been employed in the area of mono- and multifunctional colloidal nanoparticles - nanocarriers well suited for photodynamic therapy (PDT) and diagnostic purposes. Rationally engineered photosensitizer (PS)-loaded nanoparticles may be achieved via either noncovalent (i.e., self-aggregation, interfacial deposition, interfacial polymerization, or core-shell entrapment along with physical adsorption) or covalent (chemical immobilization or conjugation) processes...
September 18, 2018: Advances in Colloid and Interface Science
Muhammad Adeel, Muhammad Bilal, Tahir Rasheed, Ashutosh Sharma, Hafiz M N Iqbal
Graphene-based nanomaterials have gained high research interest in different fields related to proteins and thus are rapidly becoming the most widely investigated carbon-based materials. Their exceptional physiochemical properties such as electrical, optical, thermal and mechanical strength enable graphene to render graphene-based nanostructured materials suitable for applications in different fields such as electroanalytical chemistry, electrochemical sensors and immobilization of biomolecules and enzymes...
September 24, 2018: International Journal of Biological Macromolecules
Shalini Singh, Renu Tomar, Stephanie Ten Brinck, Jonathan De Roo, Pieter Geiregat, José C Martins, Ivan Infante, Zeger Hens
While the surface termination of quasi-spherical metal chalcogenide nanocrystals or quantum dots has been widely investigated, it remains unclear whether the ensuing surface chemistry models apply to similar nanocrystals with anisotropic shapes. In this work, we report on the surface-chemistry of 2D CdSe nanoplatelets, where we make use of an improved synthesis strategy that yields stable and aggregation free nanoplatelet suspensions with a photoluminescence quantum yield as high as 55%. We confirm that such nanoplatelets are enriched in Cd and, by means of 1 H nuclear magnetic resonance spectroscopy, we show that the Cd-rich surface is terminated by X-type carboxylate ligands...
October 17, 2018: Journal of the American Chemical Society
Farhana Sharmin Diba, Andrew Boden, Helmut Thissen, Mrinal Bhave, Peter Kingshott, Peng-Yuan Wang
The organization of matter into hierarchical structures is a fundamental characteristic of functional materials and living organisms. Binary colloidal crystal (BCC) systems present a diversified range of nanotopographic structures where large and small colloidal particles simultaneously self-assemble into either 2D monolayer or 3D hierarchical crystal lattices. More importantly, understanding how BCCs form opens up the possibility to fabricate more complex systems such as ternary or quaternary colloidal crystals...
August 23, 2018: Advances in Colloid and Interface Science
Nils Bohmer, Alexandra Rippl, Sarah May, Aurélie Walter, Min Beom Heo, Minjeong Kwak, Matthias Roesslein, Nam Woong Song, Peter Wick, Cordula Hirsch
Nanotechnology is regarded as the enabling technology of the 21st century. However, only a relatively small number of nano-enabled medical and healthcare products finally made their way to the market. There are several reasons why such innovative approaches fail in translation, with one key factor being the uncertainty surrounding their safety assessment. Although well described, interference reactions of engineered nanomaterials (ENM) with classical cytotoxicity assays remain a major source of uncertainty...
September 12, 2018: Colloids and Surfaces. B, Biointerfaces
Yanyan Liu, Yaqin Jiang, Meng Zhang, Zhongmin Tang, Mingyuan He, Wenbo Bu
The common existence of hypoxia in solid tumors has been heavily researched because it renders tumors more resistant to most standard therapeutic methods, such as radiotherapy (RT), chemotherapy, and photodynamic therapy (PDT), and is associated with a more malignant phenotype and poor survival in patients with tumors. The development of hypoxia modulation methods for advanced therapeutic activity is therefore of great interest but remains a considerable challenge. Since the significant development of nanotechnology and nanomedicine, functionalized nanomaterials can be exploited as adjuvant "drugs" for these oxygen-dependent standard therapies or as hypoxia initiators for advanced new therapies to solid tumors...
September 20, 2018: Accounts of Chemical Research
Sadia Afreen, Kasturi Muthoosamy, Sivakumar Manickam
The main objective of this review is to derive the salient features of previously developed ultrasound-assisted methods for hydroxylating graphene and Buckminsterfullerene (C60 ). The pros and cons associated to ultrasound-assisted synthesis of hydroxy-carbon nanomaterials in designing the strategical methods for the industrial bulk production are also discussed. A guideline on the statistical methods has also been considered to further provide the scopes towards the application of the previously reported methods...
September 14, 2018: Ultrasonics Sonochemistry
Jordan A Hachtel, Juan Carlos Idrobo, Miaofang Chi
Scanning transmission electron microscopy (STEM) excels in accessing atomic-scale structure and chemistry. Enhancing our ability to directly image the functionalities of local features in materials has become one of the most important topics in the future development of STEM. Recently, differential phase contrast (DPC) imaging has been utilized to map the internal electric and magnetic fields in materials from nanoscale features such as p-n junctions, skyrmions, and even from individual atoms. Here, we use an ultra-low noise SCMOS detector in as the diffraction plane camera to collect four-dimensional (4D) datasets...
2018: Advanced Structural and Chemical Imaging
Kate J F Carnevale, Geoffrey F Strouse
Covalently coupling nucleic acids to a gold nanoparticle (AuNP) surface has been demonstrated for generating effective gene therapy agents to modify cellular protein expression. The therapeutic efficacy of the approach is anticipated to be impacted by the length of time the nucleic acid sequence resides in the endolysosomal pathway once transfected into a cell. It is believed that the dynamics of the processing should reflect the linkage chemistry of the DNA to the AuNP surface. In this manuscript the dynamics of nanotherapeutic uptake, nucleic acid release, and gene processing are investigated  in vitro for a AuNP-nucleic acid delivery platform transfected into A375 human melanoma cells, as a function of the nucleic acid-gold linkage chemistry...
September 21, 2018: Bioconjugate Chemistry
Cihan Demir, Çiğdem Kip, Ali Tuncel
Organosilicon monoliths carrying chromatographic ligands with different alkyl chain lengths were obtained by thiol-methacrylate photopolymerization. The use of thiol-ene chemistry in the presence of a main monomer with a series of methacrylate functionality (i.e., methacrylate substituted polyhedral oligomeric silsesquioxane) allowed the synthesis of organosilicon monoliths with high cross-linking density and carrying hydrophobic alkyl-chain ligands by a one-pot process. In the synthesis runs, 1-butanethiol, 1-octanethiol, and 1-octadecanethiol were used as the hydrophobic thiol ligands with the number of methylene units between 4 and 18...
September 8, 2018: Electrophoresis
Guruprakash Karkera, Shivaraju G Chandrappa, Annigere S Prakash
With an anticipation of their use in electric vehicles, Li-O2 batteries are found to be attractive despite their complex chemistry and drawbacks. To be sucessful, cathode materials that are robust enough to overcome the sluggish kinetics of charge-discharge reactions are essential. We report sonochemically synthesized porous MnCo2O4 /graphene (MCO/G) as hybrid cathode material in non-aqueous Li-O2 batteries. The MCO/G hybrid is synthesized in less than 4 hours and offers a strong synergistic coupling between the MnCo2O4 nanospheres and graphene sheets...
September 3, 2018: Chemistry: a European Journal
Di Wu, Na Hu, Jichao Liu, Guangsen Fan, Xiuting Li, Jing Sun, Chunji Dai, Yourui Suo, Guoliang Li, Yongning Wu
Recently, exploitation of nanozymes for signal amplification has aroused extensive research interesting in the fields of analytical chemistry and nanoscience. Herein, we introduced a new sensing strategy based on the ascorbic acid (AA) precisely regulated Ag3 PO4 nanozyme for signal amplification. AA can reduce the partial Ag+ on the surface of Ag3 PO4 nano-particles to form Ag° particles and result in the formation of Ag°/Ag3 PO4 heterostructure. Due to surface plasmon resonance (SPR), the Ag° particles in heterostructure can act as the co-catalysts to enhance the electron-hole separation and the interfacial charge transfer, leading to a highly efficient oxidase mimicking activity for catalyzing the oxidation of the substrate of 3,3,5,5-tetramethylbenzidine (TMB) under visible light...
December 1, 2018: Talanta
Davide Stefani, Kevin J Weiland, Maxim Skripnik, Chunwei Hsu, Mickael L Perrin, Marcel Mayor, Fabian Pauly, Herre S J van der Zant
An appealing feature of molecular electronics is the possibility of inducing changes in the orbital structure through external stimuli. This can provide functionality on the single-molecule level that can be employed for sensing or switching purposes if the associated conductance changes are sizable upon application of the stimuli. Here, we show that the room-temperature conductance of a spring-like molecule can be mechanically controlled up to an order of magnitude by compressing or elongating it. Quantum-chemistry calculations indicate that the large conductance variations are the result of destructive quantum interference effects between the frontier orbitals that can be lifted by applying either compressive or tensile strain to the molecule...
September 12, 2018: Nano Letters
Xiangfu Wang, Ye Wang, Jihong Yu, Yanyan Bu, Xiaohong Yan
An efficient soft chemistry method to modify the phase, shape and optical thermometry of NaGdF4 :2%Er3+ nano-phosphors through doping Ca2+ ion is reported. With the introduction of Ca2+ , the phase changes from the GdF3 :2%Er3+ to NaGdF4 :2%Er3+ was achieved, and the shapes of NaGdF4 :2%Er3+ were modified from irregular particles to pure hexagonal NaGdF4 microtubes. These modifications derive from the charge redistribution on the nucleus surface through internal electron charge transport between Gd3+ in a lattice and co-doped Ca2+ ion...
August 20, 2018: Optics Express
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