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nanomaterials, chemistry

Gisela Ibáñez-Redín, Tiago Almeida Silva, Fernando Campanhã Vicentini, Orlando Fatibello-Filho
Carbon Black (CB) has acquired a prominent position as a carbon nanomaterial for the development of electrochemical sensors and biosensors due to its low price and extraordinary electrochemical and physical properties. These properties are highly dependent on the surface chemistry and thus, the effect of functionalization has been widely studied for different applications. Meanwhile, the influence of CB functionalization over its properties for electroanalytical applications is still being poorly explored. In this study, we describe the use of chemically functionalized CB Vulcan XC 72R for the development of sensitive electrochemical biosensors...
September 2018: Enzyme and Microbial Technology
Pingqiang Cai, Xiaoqian Zhang, Ming Wang, Yun-Long Wu, Xiaodong Chen
Nano-bio interfaces are emerging from the convergence of engineered nanomaterials and biological entities. Despite rapid growth, clinical translation of biomedical nanomaterials is heavily compromised by the lack of comprehensive understanding of biophysicochemical interactions at nano-bio interfaces. In the past decade, a few investigations have adopted a combinatorial approach toward decoding nano-bio interfaces. Combinatorial nano-bio interfaces comprise the design of nanocombinatorial libraries and high-throughput bioevaluation...
June 8, 2018: ACS Nano
Matthew R Findlay, Daniel N Freitas, Maryam Mobed-Miremadi, Korin E Wheeler
Proteins encountered in biological and environmental systems bind to engineered nanomaterials (ENMs) to form a protein corona (PC) that alters the surface chemistry, reactivity, and fate of the ENMs. Complexities such as the diversity of the PC and variation with ENM properties and reaction conditions make the PC population difficult to predict. Here, we support the development of predictive models for PC populations by relating biophysicochemical characteristics of proteins, ENMs, and solution conditions to PC formation using random forest classification...
January 1, 2018: Environmental Science. Nano
Anna L Brown, Marc P Kai, Allison N DuRoss, Gaurav Sahay, Conroy Sun
Platinum nanoparticles (PtNPs) have shown promise as diagnostic and therapeutic agents due to their unique physiochemical properties. However, critical parameters, such as toxicity and accumulation at both desired and other tissues, remain a significant concern in the clinical translation of these nanomaterials. Here, we examine the cytotoxicity, biodistribution, and effect on clearance organ function of an intravenously administered polyethylene glycol (PEG) -ylated PtNP construct. We synthesized hydrophobic PtNPs and assembled them into aqueous micelles with the lipid-polymer conjugate 1,2-distearoyl-sn-glycero-3-phosphoethanolamine (DSPE)-PEG (PtNP: DSPE-PEG, ~70 nm)...
June 7, 2018: Nanomaterials
Rafael A Soler-Crespo, Wei Gao, Lily Mao, Hoang T Nguyen, Michael R Roenbeck, Jeffrey T Paci, Jiaxing Huang, SonBinh T Nguyen, Horacio D Espinosa
Graphene oxide (GO), whose highly tunable surface chemistry enables the formation of strong interfacial hydrogen bond networks, has garnered increasing interest in the design of devices that operate in the presence of water. For instance, previous studies have suggested that controlling GO's surface chemistry leads to enhancements in interfacial shear strength, allowing engineers to manage deformation pathways and control failure mechanisms. However, these previous reports have not explored the role of ambient humidity, and only offer extensive chemical modifications to GO's surface as the main pathway to control GO's interfacial properties...
June 5, 2018: ACS Nano
Zheng Luo, Yang Xu, Enyi Ye, Zibiao Li, Yun-Long Wu
Gold nanoparticles (AuNPs), with elegant thermal, optical, or chemical properties due to quantum size effects, may serve as unique species for therapeutic or diagnostic applications. It is worth mentioning that their small size also results in high surface activity, leading to significantly impaired stability, which greatly hinders their biomedical utilizations. To overcome this problem, various types of macromolecular materials are utilized to anchor AuNPs so as to achieve advanced synergistic effect by dispersing, protecting, and stabilizing the AuNPs in polymeric-Au hybrid self-assemblies...
June 4, 2018: Macromolecular Rapid Communications
Hongsheng Liu, Cristiana Di Valentin
Surfaces and their interaction with water play an important role in most of materials' applications. Magnetite has attracted continued interest in the fields of catalysis, spintronic devices, magnetic resonance imaging (MRI) and drug delivery. In this work, water adsorption and its effect on the stability diagram and on the electronic structure of the Fe3O4(001) surface are investigated by hybrid density functional theory calculations combined with an ab initio atomistic thermodynamic approach. We span a wide range of gaseous O2 and vapor H2O partial pressures...
June 5, 2018: Nanoscale
Qiaofeng Yao, Tiankai Chen, Xun Yuan, Jianping Xie
Total synthesis, where desired organic- and/or biomolecules could be produced from simple precursors at atomic precision and with known step-by-step reactions, has prompted centuries-lasting bloom of organic chemistry since its conceptualization in 1828 (Wöhler synthesis of urea). Such expressive science is also highly desirable in nanoscience, since it represents a decisive step toward atom-by-atom customization of nanomaterials for basic and applied research. Although total synthesis chemistry is less established in nanoscience, recent years have witnessed seminal advances and increasing research efforts devoted into this field...
May 24, 2018: Accounts of Chemical Research
Dwaipayan Ghosh, Benny Febriansyah, Disha Gupta, Leonard Kia-Sheun Ng, Shibo Xi, Yonghua Du, Tom Baikie, ZhiLi Dong, Han Sen Soo
Catalyst deactivation is a persistent problem not only for the scientific community but also in industry. Isolated single-site heterogeneous catalysts have shown great promise to overcome these problems. Here, a versatile anchoring strategy for molecular complex immobilization on a broad range of semiconducting or insulating metal oxide (e.g. titanium dioxide, mesoporous silica, cerium oxide, and tungsten oxide) nanoparticles to synthesize isolated single-site catalysts has been studied systematically. An oxidatively stable anchoring group, maleimide, is shown to form covalent linkages with surface hydroxyl functionalities of metal oxide nanoparticles by photoclick chemistry...
May 18, 2018: ACS Nano
Congxin Xia, Shanshan Zhang, Di Sun, Baolai Jiang, Wenshou Wang, Xia Xin
In this work, three-dimensional nanoflowers with tunable fluorescent properties constructed by mixed Weakley-type polyoxometalates (POMs, Na9[LnW10O36]•32H2O, Ln = Eu, Tb, abbreviate to LnW10) and tetraethylenepentamine (TEPA) have been successfully prepared through a facile ionic self-assembly (ISA) method. The shape and petal size of the nanoflower as well as its fluorescent behaviours can be tuned through varying the ratio of EuW10/TbW10. The varied-temperature emission behaviors in 80-260K show the fluorescent intensity of both Tb3+ and Eu3+ decreased with the temperature raised which makes them to be potential luminescent ratiometric thermometers...
May 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhen Liu, Jingquan Liu, Yichao Wang, Joselito Razal, Paul Francis, Mark J Biggs, Colin Barrow, Wenrong Yang
Dispersing graphene oxide (GO) in low-polar solvents can realize a perfect self-assembly with functional molecules and application in removal of organic impurities that only dissolve in low-polar solvents. The surface chemistry of GO plays an important role in its dispersity in these solvents. The direct transfer of hydrophilic GO into low-polar solvents, however, has remained an experimental challenge. In this study, we design an interface to transfer GO by simultaneously "pushing and pulling" the nanosheets into low-polar solvents...
May 14, 2018: Nanotechnology
David K Smith
This feature article provides a personal insight into the research from my group over the past 10 years. In particular, the article explains how, inspired in 2005 by meeting my now-husband, Sam, who had cystic fibrosis, and who in 2011 went on to have a double lung transplant, I took an active decision to follow a more applied approach to some of our research, attempting to use fundamental supramolecular chemistry to address problems of medical interest. In particular, our strategy uses self-assembly to fabricate biologically-active nanosystems from simple low-molecular-weight building blocks...
May 8, 2018: Chemical Communications: Chem Comm
Qisheng Wu, Wen Wu Xu, Liang Ma, Jinlan Wang, Xiao Cheng Zeng
Aurophilicity, known as aurophilic interaction, is a strong attractive van der Waals interaction between cationic gold(I) centers, whose strength is comparable to the hydrogen bond. Here, we show that aurophilicity can serve as an engineering approach to expand the structural dimensionality for nanomaterials design. Specifically, based on a global-structure search method and density functional theory calculations, we predict a series of stable two-dimensional (2D) AuMX2 (M = Al, Ga, In; X = S, Se) structures featuring intracrystalline aurophilic interactions...
May 16, 2018: ACS Applied Materials & Interfaces
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 HPLC 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...
May 2, 2018: Biomacromolecules
Rui Xiong, Ho Shin Kim, Lijuan Zhang, Volodymyr F Korolovych, Shuaidi Zhang, Yaroslava G Yingling, Vladimir V Tsukruk
Constructing advanced functional nanomaterials with pre-designed organized morphologies from low-dimension synthetic and biological components is challenging. Herein, we report an efficient and universal amphiphilicity-driven assembly strategy to construct "hairy" flexible hybrid nanosheets with a 1D cellulose nanofibers (CNFs) net conformally wrapped around 2D graphene oxide (GO) monolayers. This interface-driven bio-synthetic assembly is facilitated by tailoring the surface chemistry of flexible GO sheets, resulting in individual sheets tightly surrounded by dense conformal nanocellulose network...
April 17, 2018: Angewandte Chemie
Rachel L 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...
May 14, 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 23, 2018: Chemical Society Reviews
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