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nanomaterials, chemistry

Edvaldo V Soares Maciel, Ana Lúcia de Toffoli, Fernando Mauro Lanças
The accelerated rising of the world's population increased the consumption of food, thus demanding more rigors in the control of residue and contaminants in food-based products marketed for human consumption. In view of the complexity of most food matrices, including fruits, vegetables, different types of meat, beverages, among others, a sample preparation step is important to provide more reliable results when combined with high performance liquid chromatography separations. An adequate sample preparation step before the chromatographic analysis is mandatory in obtaining higher precision and accuracy in order to improve the extraction of the target analytes, one of the priorities in analytical chemistry...
April 20, 2018: Electrophoresis
Roger Alberto, Angelo Frei, Pennie P Mokolokolo, Robin Bolliger, Henrik Braband, Tsosane S Mampotso, Alice Brink, Andreas Roodt
Multinuclear complexes or clusters are rarely investigated in medicinal inorganic chemistry although they represent structural intermediates between molecules and nanomaterials. We present in this report two strategies towards 99mTc containing clusters. In a pre-assembly approach, the preformed but incomplete cluster fragment [Re3(2-OH)33-OH)(CO)9]- reacts with [99mTc(CO)3]+ to the highly stable [99mTcRe3(3-OH)4(CO)12] cube. The same structure self-assembles when reacting the mono-nuclear Re and 99mTc precursors in one pot...
April 19, 2018: Chemistry: a European Journal
Jacek K Wychowaniec, Maria Iliut, Mi Zhou, Jonathan Moffat, Mohamed A Elsawy, Wagner A Pinheiro, Judith A Hoyland, Aline F Miller, Aravind Vijayaraghavan, Alberto Saiani
A recent strategy that has emerged for the design of increasingly functional hydrogels is the incorporation of nanofillers in order to exploit their specific properties to either modify the performance of the hydrogel or add functionality. The emergence of carbon nanomaterials in particular has provided great opportunity for the use of graphene derivatives (GDs) in biomedical applications. The key challenge when designing hybrid materials is the understanding of the molecular interactions between the matrix (peptide nanofibers) and the nanofiller (here GDs) and how these affect the final properties of the bulk material...
April 19, 2018: Biomacromolecules
Rui Xiong, Ho Shin Kim, Volodymyr F Korolovych, Shuaidi Zhang, Yaroslava Yingling, Vladimir V Tsukruk
Constructing advanced functional nanomaterials with pre-designed organized morphologies from low-dimension synthetic and biological components is extremely challenging because of complex inter-component interactions, high-aspect ratios, flexible shapes, crumpling instabilities and limited common wet-chemistry processing conditions. Herein, we report an efficient and universal amphiphilicity-driven assembly strategy to construct "hairy" flexible hybrid nanosheets with the net of 1D cellulose nanofibers (CNFs) conformally wrapped around 2D graphene oxide (GO) monolayers...
April 17, 2018: Angewandte Chemie
Rachel Leah Merzel, Bradford G Orr, Mark M Banaszak Holl
Characterization of materials with biological applications and assessment of physiological effects of therapeutic interventions are critical for translating research to the clinic and preventing adverse reactions. Analytical techniques typically used to characterize targeted nanomaterials and tissues rely on bulk measurement. Therefore, the resulting data represent an average structure of the sample, masking stochastic (randomly generated) distributions that are commonly present. In this Perspective, we examine almost 20 years of work our group has done in different fields to characterize and control distributions...
April 17, 2018: Biomacromolecules
Qianqian Shang, Chengguo Liu, Yun Hu, Puyou Jia, Lihong Hu, Yonghong Zhou
This work presents an efficient and environmentally friendly approach to generate hydrophobic cellulose nanocrystals (CNC) using thiol-containing castor oil (CO-SH) as a renewable hydrophobe with the assist of bio-inspired dopamine at room temperature. The modification process included the formation of the polydopamine (PDA) buffer layer on CNC surfaces and the Michael addition reaction between the catechol moieties of PDA coating and thiol groups of CO-SH. The morphology, crystalline structure, surface chemistry, thermal stability and hydrophobicity of the modified CNC were charactered by TEM, XRD, FT-IR, solid-state 13 C NMR, XPS, TGA and contact angle analysis...
July 1, 2018: Carbohydrate Polymers
E Johan Foster, Robert J Moon, Umesh P Agarwal, Michael J Bortner, Julien Bras, Sandra Camarero-Espinosa, Kathleen J Chan, Martin J D Clift, Emily D Cranston, Stephen J Eichhorn, Douglas M Fox, Wadood Y Hamad, Laurent Heux, Bruno Jean, Matthew Korey, World Nieh, Kimberly J Ong, Michael S Reid, Scott Renneckar, Rose Roberts, Jo Anne Shatkin, John Simonsen, Kelly Stinson-Bagby, Nandula Wanasekara, Jeff Youngblood
A new family of materials comprised of cellulose, cellulose nanomaterials (CNMs), having properties and functionalities distinct from molecular cellulose and wood pulp, is being developed for applications that were once thought impossible for cellulosic materials. Commercialization, paralleled by research in this field, is fueled by the unique combination of characteristics, such as high on-axis stiffness, sustainability, scalability, and mechanical reinforcement of a wide variety of materials, leading to their utility across a broad spectrum of high-performance material applications...
April 16, 2018: Chemical Society Reviews
Damien P Debecker, Solène Le Bras, Cédric Boissière, Alexandra Chaumonnot, Clément Sanchez
Aerosol processing is long known and implemented industrially to obtain various types of divided materials and nanomaterials. The atomisation of a liquid solution or suspension produces a mist of aerosol droplets which can then be transformed via a diversity of processes including spray-drying, spray pyrolysis, flame spray pyrolysis, thermal decomposition, micronisation, gas atomisation, etc. The attractive technical features of these aerosol processes make them highly interesting for the continuous, large scale, and tailored production of heterogeneous catalysts...
April 16, 2018: Chemical Society Reviews
Marcelo M Nobrega, Erico Teixeira-Neto, Andrew B Cairns, Marcia L A Temperini, Roberto Bini
Low-dimensional nanomaterials such as highly ordered polyaniline (PANI) have attracted considerable interest due to their expected extraordinary electronic and optoelectronic properties. In spite of several attempts, the attainment of atomically well-ordered PANI is a long-standing challenge. Pressure-induced polymerization of aromatic molecules in the crystal phase has been demonstrated as a practicable route for the synthesis of highly ordered polymers but this approach has never been tested to produce PANI...
January 7, 2018: Chemical Science
William Edwards, Nicolas Marro, Grace Turner, Euan R Kay
Surface chemical composition is fundamental to determining properties on the nanoscale, making precise control over surface chemistry critical to being able to optimise nanomaterials for virtually any application. Surface-engineering independent of the preparation of the underlying nanomaterial is particularly attractive for efficient, divergent synthetic strategies, and for the potential to create reactive, responsive and smart nanodevices. For monolayer-stabilised nanoparticles, established methods include ligand exchange to replace the ligand shell in its entirety, encapsulation with amphiphilic (macro)molecules, noncovalent interactions with surface-bound biomolecules, or a relatively limited number of covalent bond forming reactions...
January 7, 2018: Chemical Science
Lidia Nazaret Gómez-Arribas, Elena Benito-Peña, María Del Carmen Hurtado-Sánchez, María Cruz Moreno-Bondi
Food allergy is one of the major health threats for sensitized individuals all over the world and, over the years, the food industry has made significant efforts and investments to offer safe foods for allergic consumers. The analysis of the concentration of food allergen residues in processing equipment, in raw materials or in the final product, provides analytical information that can be used for risk assessment as well as to ensure that food-allergic consumers get accurate and useful information to make their food choices and purchasing decisions...
April 4, 2018: Sensors
Vijeta Sharma, Nagarjuna Amarnath, Swapnil Shukla, R Ayana, Naveen Kumar, Nisha Yadav, Deepika Kannan, Seema Sehrawat, Soumya Pati, Bimlesh Lochab, Shailja Singh
Development of new class of anti-malarial drugs is an essential requirement for the elimination of malaria. Bioactive components present in medicinal plants and their chemically modified derivatives could be a way forward towards the discovery of effective anti-malarial drugs. Herein, we describe a new class of compounds, 1,3-benzoxazine derivatives of pharmacologically active phytophenols eugenol (compound 3) and isoeugenol (compound 4) synthesised on the principles of green chemistry, as anti-malarials. Compound 4, showed highest anti-malarial activity with no cytotoxicity towards mammalian cells...
March 19, 2018: Bioorganic & Medicinal Chemistry Letters
Zhaowei Chen, Chaoqun Liu, Fangfang Cao, Jinsong Ren, Xiaogang Qu
DNA metallization has witnessed tremendous growth and development, from the initial simple synthesis aimed at manufacturing conductive metal nanowires to the current fabrication of various nanostructures for applications in areas as diverse as nanolithography, energy conversion and storage, catalysis, sensing, and biomedical engineering. To this, our aim here was to present a comprehensive review to summarize the research activities on DNA metallization that have appeared since the concept was first proposed in 1998...
April 3, 2018: Chemical Society Reviews
Guolong Zhu, Zihan Huang, Ziyang Xu, Li-Tang Yan
The ability to tailor the interfacial behaviors of nanoparticles (NPs) is crucial not only for the design of novel nanostructured materials with superior properties and of interest for many promising applications such as water purification, enhanced oil recovery, and innovative energy transduction, but also for a better insight into many biological systems where nanoscale particles such as proteins or viruses can interact and organize at certain interfaces. As a class of emerging building blocks, Janus NPs consisting of two compartments of different chemistry or polarity are ideal candidates to generate tunable and stable interfacial nanostructures because of the asymmetric nature...
March 28, 2018: Accounts of Chemical Research
Sabrina Engel, Nadja Möller, Lucas Stricker, Martin Peterlechner, Bart Jan Ravoo
A self-assembly approach for the design of multifunctional nanomaterials consisting of different nanoparticles (gold, iron oxide, and lanthanide-doped LiYF4 ) is developed. This modular system takes advantage of the light-responsive supramolecular host-guest chemistry of β-cyclodextrin and arylazopyrazole, which enables the dynamic and reversible self-assembly of particles to spherical nanoparticle aggregates in aqueous solution. Due to the magnetic iron oxide nanoparticles, the aggregates can be manipulated by an external magnetic field leading to the formation of linear structures...
March 24, 2018: Small
Yangbo Wang, Bingxiao Yang, Kun Chen, Enlong Zhou, Qinghua Zhang, Lisha Yin, Xiaoji Xie, Lin Gu, Ling Huang
Scandium (Sc) sits at a unique position in the periodic table, i.e., the junction of the top of the rare earth column and the beginning of the transition metal row. Studies have shown that Sc-based nanomaterials are very sensitive to the surrounding chemical environment. A simple adjustment of the chemical reaction conditions such as temperature, surfactant molecules, and solvents (e.g., oleic acid (OA) or 1-octadecene (OD)) can easily lead to different products in terms of chemical composition and phase structure...
March 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Mohamed Bayati, Jingjing Dai, Austin Zambrana, Chloe Rees, Maria Fidalgo de Cortalezzi
Carbon dots are rapidly emerging carbon-based nanomaterials that, due to their growing applications, will inevitable find their way to natural waters; however, their environmental fate is mostly unknown. Carbon dots with different surface functionality were fabricated and characterized by TEM and FT-IR. Their surface charge, given by the zeta potential, and their hydrodynamic diameter in suspension were investigated under a variety of environmentally relevant conditions. The effect of ionic strength was studied in the presence of monovalent (NaCl) and divalent (CaCl2 ) cations, for pH levels from 3 to 11; humic acid was used as a model for dissolved natural organic matter...
March 2018: Journal of Environmental Sciences (China)
Luca Malfatti, Plinio Innocenzi
Carbon dots are an emerging class of carbon-based nanostructures produced by low-cost raw materials which exhibit a widely-tunable photoluminescence and a high quantum yield. The potential of these nanomaterials as a substitute of semiconductor quantum dots in optoelectronics and biomedicine is very high, however they need a customized chemistry to be integrated in host-guest systems or functionalized in core-shell structures. This review is focused on recent advances of the sol-gel chemistry applied to the C-dots technology...
March 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
David Portehault, Simon Delacroix, Guillaume Gouget, Rémi Grosjean, Tsou-Hsi-Camille Chan-Chang
The design of inorganic nanoparticles relies strongly on the knowledge from solid-state chemistry not only for characterization techniques, but also and primarily for choosing the systems that will yield the desired properties. The range of inorganic solids reported and studied as nanoparticles is however strikingly narrow when compared to the solid-state chemistry portfolio of bulk materials. Efforts to enlarge the collection of inorganic particles are becoming increasingly important for three reasons. First, they can yield materials more performing than current ones for a range of fields including biomedicine, optics, catalysis, and energy...
March 13, 2018: Accounts of Chemical Research
Ralph Freund, Ulrich Lächelt, Tobias Gruber, Bastian Rühle, Stefan Wuttke
Green chemistry, in particular, the principle of atom economy, has defined new criteria for the efficient and sustainable production of synthetic compounds. In complex nanomaterials, the number of embedded functional entities and the energy expenditure of the assembly process represent additional compound-associated parameters that can be evaluated from an economic viewpoint. In this Perspective, we extend the principle of atom economy to the study and characterization of multifunctionality in nanocarriers, which we define as "multifunctional efficiency"...
March 13, 2018: ACS Nano
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