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https://www.readbyqxmd.com/read/29775852/biomimetic-magnetoelectric-nanocrystals-synthesized-by-polymerization-of-heme-as-advanced-nanomaterials-for-biosensing-application
#1
Jeong Eun Hyeon, Da Woon Jeong, Young Jin Ko, Seung Wook Kim, Chulhwan Park, Sung Ok Han
Regardless of the malaria disease risk, the malaria parasite Plasmodium falciparum has an interesting mechanism. During its growth within the red blood cell, toxic free heme is converted into an insoluble crystalline form called the malaria pigment, or hemozoin. In particular, natural hemozoin nanocrystals can provide multiple applications in biosensing fields for health care and diagnosis as similar to artificial metal nanoparticles. In this study, the heme was biologically synthesized and polymerized by Corynebacterium glutamicum and final polymer was applied as a biomimetic conductive biopolymer...
May 10, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775279/plasma-jet-printing-and-in-situ-reduction-of-highly-acidic-graphene-oxide
#2
Avishek Dey, Satheesh Krishnamurthy, James Bowen, Dennis Nordlund, M Meyyappan, Ram P Gandhiraman
Miniaturisation of electronic devices and the advancement of Internet of things pose exciting challenges to develop technologies for patterned deposition of functional nanomaterials. Printed and flexible electronic devices and energy storage devices can be embedded onto clothing or other flexible surfaces. Graphene oxide (GO) has gained much attention in printed electronics due its solution processability, robustness and high electrical conductivity in the reduced state. Here we introduce a new approach to print GO films from highly acidic suspensions with in-situ reduction using an atmospheric pressure plasma jet...
May 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29775278/hybrid-nanomaterials-with-single-site-catalysts-by-spatially-controllable-immobilization-of-nickel-complexes-via-photoclick-chemistry-for-alkene-epoxidation
#3
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
https://www.readbyqxmd.com/read/29775050/modulation-of-macrophage-phenotype-by-biodegradable-polyurethane-nanoparticles-the-possible-relation-between-macrophage-polarization-and-immune-response-of-nanoparticles
#4
Yen-Jang Huang, Kun-Che Hung, Huey-Shan Hung, Shan-Hui Hsu
Nanomaterials with surface functionalized by different chemical groups can either provoke or attenuate the immune responses of the nanomaterials, which is critical to their biomedical efficacies. In this study we demonstrate that synthetic waterborne polyurethane nanoparticles (PU NPs) can inhibit the macrophage polarization towards the M1 phenotype, but not M2 phenotype. The surface-functionalized PU NPs decrease the secretion levels of proinflammatory cytokines (TNF-α and IL-1β) for M1 macrophages. Specifically, PU NPs with carboxyl groups on the surface exhibit a greater extent of inhibition on M1 polarization than those with amine groups...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29774629/in-situ-nanoreactors-controllable-photoluminescent-carbon-rich-polymer-nanodots-derived-from-fatty-acid-under-photoirradiation
#5
Qin Dai, He Zhao, Zhuangjun Fan, Wentao Zhao, Guangwei Wang, Jimei Zhang, Rong Hou, Penghui Du, Hongbin Cao
Amphiphilic nanoreactors have been recently used to fabricate photoluminescent carbon-rich polymer nanodots (PCPNs). However, the applications of PCPNs have been limited by their requirements for high temperature and toxic organic solvents or catalysts and the difficult control of their luminescent properties. Herein, a novel and facile strategy is reported for the synthesis of controllable PCPNs. This strategy involves the use of in situ vesicular nanoreactors under mild photoirradiation with fatty acid as the precursor...
May 17, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29774065/catalytic-hairpin-assembly-gel-assay-for-multiple-and-sensitive-microrna-detection
#6
Wenhao Dai, Jing Zhang, Xiangdan Meng, Jie He, Kai Zhang, Yu Cao, Dongdong Wang, Haifeng Dong, Xueji Zhang
As important modulators of gene expression, microRNAs (miRNAs) have been identified as promising biomarkers with powerful predictive value in diagnosis and prognosis for several diseases, especially for cancers. Here we report a facile, multiple and sensitive miRNA detection method that uses conventional gel electrophoresis and catalytic hairpin assembly (CHA) system without any complex nanomaterials or enzymatic amplification. Methods: In this study, three pairs of hairpin probes are rationally designed with thermodynamically and kinetically preferable feasibility for the CHA process...
2018: Theranostics
https://www.readbyqxmd.com/read/29773785/revealing-isoelectronic-size-conversion-dynamics-of-metal-nanoclusters-by-a-noncrystallization-approach
#7
Qiaofeng Yao, Victor Fung, Cheng Sun, Sida Huang, Tiankai Chen, De-En Jiang, Jim Yang Lee, Jianping Xie
Atom-by-atom engineering of nanomaterials requires atomic-level knowledge of the size evolution mechanism of nanoparticles, which remains one of the greatest mysteries in nanochemistry. Here we reveal atomic-level dynamics of size evolution reaction of molecular-like nanoparticles, i.e., nanoclusters (NCs) by delicate mass spectrometry (MS) analyses. The model size-conversion reaction is [Au23 (SR)16 ]- → [Au25 (SR)18 ]- (SR = thiolate ligand). We demonstrate that such isoelectronic (valence electron count is 8 in both NCs) size-conversion occurs by a surface-motif-exchange-induced symmetry-breaking core structure transformation mechanism, surfacing as a definitive reaction of [Au23 (SR)16 ]-  + 2 [Au2 (SR)3 ]- → [Au25 (SR)18 ]-  + 2 [Au(SR)2 ]- ...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773374/electrospinning-and-wound-healing-activity-of-%C3%AE-chitin-extracted-from-cuttlefish-bone
#8
Hyeong-Seop Jung, Min Hee Kim, Ji Youn Shin, Se Ra Park, Ju-Young Jung, Won Ho Park
A nanofibrous β-chitin web was fabricated via electrospinning for use as a novel wound dressing material. β-chitin was extracted from cuttlefish bone using deproteinization and demineralization. First, cuttlefish bone was alkali-treated to remove the proteins and was then treated with the acid for demineralization. The extracted β-chitin was dissolved in formic acid as solvent to evaluate its electrospinnability, and the electrospinnability increased remarkably when β-chitin was blended with poly(ethylene oxide) (PEO) than without...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773372/bionanocomposites-materials-for-food-packaging-applications-concepts-and-future-outlook
#9
REVIEW
Ahmed M Youssef, Samah M El-Sayed
Bionanocomposites materials open a chance for the usage of novel, high performance, lightweight, and ecofriendly composite materials making them take place the traditional non-biodegradable plastic packaging materials. Biopolymers like polysaccharides such as chitosan (CS), carboxymethyl cellulose (CMC), starch and cellophane could be used to resolve environmental hazards owing to their biodegradability and non-toxicity. In addition these advantages, polysaccharides have some disadvantages for example poor mechanical properties and low resistance to water...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29772760/a-review-of-carbon-nanomaterials-synthesis-via-the-chemical-vapor-deposition-cvd-method
#10
REVIEW
Yehia M Manawi, Ayman Samara, Tareq Al-Ansari, Muataz A Atieh
Carbon nanomaterials have been extensively used in many applications owing to their unique thermal, electrical and mechanical properties. One of the prime challenges is the production of these nanomaterials on a large scale. This review paper summarizes the synthesis of various carbon nanomaterials via the chemical vapor deposition (CVD) method. These carbon nanomaterials include fullerenes, carbon nanotubes (CNTs), carbon nanofibers (CNFs), graphene, carbide-derived carbon (CDC), carbon nano-onion (CNO) and MXenes...
May 17, 2018: Materials
https://www.readbyqxmd.com/read/29772689/fabrication-and-characterization-of-nanoenergetic-hollow-spherical-hexanitrostibene-hns-derivatives
#11
Xiong Cao, Peng Deng, Shuangqi Hu, Lijun Ren, Xiaoxia Li, Peng Xiao, Yu Liu
The spherization of nanoenergetic materials is the best way to improve the sensitivity and increase loading densities and detonation properties for weapons and ammunition, but the preparation of spherical nanoenergetic materials with high regularization, uniform size and monodispersity is still a challenge. In this paper, nanoenergetic hollow spherical hexanitrostibene (HNS) derivatives were fabricated via a one-pot copolymerization strategy, which is based on the reaction of HNS and piperazine in acetonitrile solution...
May 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29772646/an-innovative-porous-nanocomposite-material-for-the-removal-of-phenolic-compounds-from-aqueous-solutions
#12
Antonio Turco, Anna Grazia Monteduro, Elisabetta Mazzotta, Giuseppe Maruccio, Cosimino Malitesta
Energy efficient, low-cost, user-friendly, and green methods for the removal of toxic phenolic compounds from aqueous solution are necessary for waste treatment in industrial applications. Herein we present an interesting approach for the utilization of oxidized carbon nanotubes (CNTs) in the removal of phenolic compounds from aqueous solution. Dried pristine CNTs were stably incorporated in a solid porous support of polydimethylsiloxane (PDMS) facilitating the handling during both oxidation process of the nanomaterial and uptake of phenolic compounds, and enabling their safe disposal, avoiding expensive post-treatment processes...
May 16, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29772516/acidic-amino-acids-a-new-type-of-enzyme-mimics-with-application-to-biosensing-and-evaluating-of-antioxidant-behaviour
#13
Ying Shi, Li Liu, Yuanyuan Yu, Yijuan Long, Huzhi Zheng
Nanomaterials have triggered tremendous interest to mimick peroxidase but rarely attention has been paid to small molecules. Herein we first found that acidic amino acids including l-glutamic acid (L-Glu) and l-aspartic acid (L-Asp) exhibited an intrinsic peroxidase-like activity, endowing acidic amino acids with the capability of catalysing the oxidation of the peroxidase substrates 3,3',5,5'-tetramethylbenzidine (TMB) to produce color reaction in the presence of H2 O2 . Reaction mechanism was further investigated by means of electron spin resonance spectroscopy (ESR), enzyme kinetics assay and quantum theoretical calculations, to verify and provide a good deal of insight into the catalytic process...
May 8, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29772415/highly-efficient-polymer-supported-monodisperse-ruthenium-nickel-nanocomposites-for-dehydrocoupling-of-dimethylamine-borane
#14
Betul Sen, Esra Kuyuldar, Buse Demirkan, Tugba Onal Okyay, Aysun Şavk, Fatih Sen
In the present study, highly effective and reusable monodisperse ruthenium-nickel (Ru-Ni) nanomaterials supported on poly(N-vinyl-2-pyrrolidone) (Ru-Ni@PVP) were synthesized (3.51 ± 0.38 nm) by a facile sodium-hydroxide-assisted reduction method; Ru and Ni reduction in PVP solution was accomplished. The prepared nanocomposites were characterized by TEM, HRTEM, XRD, and XPS and performed as a catalyst for dehydrocoupling of dimethylamine-borane (DMAB). It was found that Ru-Ni nanomaterials are one of the most active catalysts at low concentrations and temperature for dehydrocoupling of DMAB...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#15
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29770813/nanomaterial-based-devices-for-point-of-care-diagnostic-applications
#16
Daniel Quesada-González, Arben Merkoçi
In this review, we have discussed the capabilities of nanomaterials for point-of-care (PoC) diagnostics and explained how these materials can help to strengthen, miniaturize and improve the quality of diagnostic devices. Since the optical, electrochemical and other physical properties of nanomaterials are dictated by their composition, size and shape, these factors are critical in the design and function of nanomaterial-based PoC diagnostics.
May 17, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29770811/intrinsic-peroxidase-like-activity-and-enhanced-photo-fenton-reactivity-of-iron-substituted-polyoxometallate-nanostructures
#17
Akif Zeb, Shafaq Sahar, Umair Yaqub Qazi, Atheer Hameid Odda, Naseeb Ullah, Ya-Nan Liu, Ishtiaq A Qazi, An-Wu Xu
Heteropolyacids (HPAs) are a class of polyoxometallates (POMs) with oxygen-rich surfaces. Herein, we have developed an Fe-containing heteropolyacid by cation-exchange and employed KFePW12O40 nanostructures for Fenton, photo-Fenton and enzyme-mimetic reactions. The as-prepared KFePW12O40 catalyst exhibits efficient degradation of Rhodamine B (RhB) via the photo-Fenton reaction. As an enzyme-mimetic, this material can effectively oxidize TMB and dopamine. The obtained nanomaterials were characterized via SEM, TEM, XPS, BET surface area, TGA, UV-Vis spectroscopy, FT-IR, and XRD techniques...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29770774/i-v-characteristics-of-graphene-nanoribbon-h-bn-heterojunctions-and-resonant-tunneling
#18
Taiga Wakai, Shoichi Sakamoto, Mitsuyoshi Tomiya
We present the first principle calculations of the electrical properties of graphene sheet/h-BN heterojunction(GS/h-BN) and 11-armchair graphene nanoribbon heterojunction(11-AGNR/h-BN), which were carried out using the density functional theory(DFT) method and the non-equilibrium Green's function(NEGF) technique. Since 11-AGNR belongs to the conductive (3n-1)-family of AGNR, both are metallic nanomaterials with two transverse arrays of h-BN, which is a wide-gap semi-conductor. The two h-BN arrays act as double barriers...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29770369/nanomaterial-microbe-cross-talk-physicochemical-principles-and-patho-biological-consequences
#19
REVIEW
D Westmeier, A Hahlbrock, C Reinhardt, J Fröhlich-Nowoisky, S Wessler, C Vallet, U Pöschl, S K Knauer, R H Stauber
The applications of nanoparticles (NPs) are increasing exponentially in consumer products, biotechnology and biomedicine, and humans, as well as the environment, are increasingly being exposed to NPs. Analogously, various (pathogenic) microorganisms are present at all the major exposure and entry sites for NPs in the human body as well as in environmental habitats. However, the field has just started to explore the complex interplay between NPs and microbes and the (patho)biological consequences. Based on recent insights, herein, we critically reviewed the available knowledge about the interaction of NPs with microbes and the analytical investigations including the latest intravital imaging tools...
May 17, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29769673/thickness-independent-capacitance-of-vertically-aligned-liquid-crystalline-mxenes
#20
Yu Xia, Tyler S Mathis, Meng-Qiang Zhao, Babak Anasori, Alei Dang, Zehang Zhou, Hyesung Cho, Yury Gogotsi, Shu Yang
The scalable and sustainable manufacture of thick electrode films with high energy and power densities is critical for the large-scale storage of electrochemical energy for application in transportation and stationary electric grids. Two-dimensional nanomaterials have become the predominant choice of electrode material in the pursuit of high energy and power densities owing to their large surface-area-to-volume ratios and lack of solid-state diffusion1,2 . However, traditional electrode fabrication methods often lead to restacking of two-dimensional nanomaterials, which limits ion transport in thick films and results in systems in which the electrochemical performance is highly dependent on the thickness of the film1-4 ...
May 2018: Nature
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