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Nanomaterials

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https://read.qxmd.com/read/30759883/determination-of-transport-properties-of-glycol-based-nanofluids-derived-from-surface-functionalized-graphene
#1
Ebtisam Saeed, Manuel M Piñeiro, Carolina Hermida-Merino, María José Pastoriza-Gallego
Suspensions of nanometric-sized graphene platelets have been proposed recently as potential heat exchange working fluids, due to their remarkably enhanced thermal profile. Nevertheless, their use presents serious long-term stability issues. Due to this limitation, the nanoplatelets surface chemical functionalization has been postulated as a promising alternative to solve this problem. In this work, graphene nanoplatelets were functionalized following an oxidation-reduction process, and then dispersed in glycol as base fluid...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759881/tuning-localized-surface-plasmon-resonance-of-nanoporous-gold-with-a-silica-shell-for-surface-enhanced-raman-scattering
#2
Wei Li, Chao Ma, Ling Zhang, Bin Chen, Luyang Chen, Heping Zeng
We report the tuning of localized surface plasmon resonance (LSPR) of nanoporous gold (NPG) by silica coating, which also affects the surface enhanced Raman scattering (SERS) of NPG. In this study, controllable silica shell is assembled on the NPG surface, and a fully silica thin layer causes more than 50 nm red-shift of LSPR band due to dielectric medium dependence. Additionally, ~1 nm silica coated NPG film shows excellent SERS enhancement, which is due to electromagnetic coupling between ligaments and local surface plasmon field enhancement within pores, and theoretical analysis indicates that silica coating further improves the coupling effect, which demonstrates the electromagnetic origin of the tuning of SERS effect...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759854/ups-and-downs-of-water-photodecolorization-by-nanocomposite-polymer-nanofibers
#3
Shahin Homaeigohar, Niharika Krishna Botcha, Eman S Zarie, Mady Elbahri
Given the exponentially expanding water pollution causing water scarcity, there is an urgent need for operative nanotechnological systems that can purify water, with insignificant energy consumption, and rapidly. Here, we introduce a nanocomposite system based on TiO₂ nanoparticles (NPs) and PES nanofibers (NFs) that can adsorb and then photodecompose organic water pollutants such as dye molecules. We evaluate pros and cons of this system with respect to its purification efficiency and structural properties that can be impacted by the photocatalytic activity of the nanofillers...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759838/straightforward-immobilization-of-phosphonic-acids-and-phosphoric-acid-esters-on-mesoporous-silica-and-their-application-in-an-asymmetric-aldol-reaction
#4
Christian Weinberger, Tatjana Heckel, Patrick Schnippering, Markus Schmitz, Anpeng Guo, Waldemar Keil, Heinrich C Marsmann, Claudia Schmidt, Michael Tiemann, René Wilhelm
The combined benefits of moisture-stable phosphonic acids and mesoporous silica materials (SBA-15 and MCM-41) as large-surface-area solid supports offer new opportunities for several applications, such as catalysis or drug delivery. We present a comprehensive study of a straightforward synthesis method via direct immobilization of several phosphonic acids and phosphoric acid esters on various mesoporous silicas in a Dean⁻Stark apparatus with toluene as the solvent. Due to the utilization of azeotropic distillation, there was no need to dry phosphonic acids, phosphoric acid esters, solvents, or silicas prior to synthesis...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759830/a-novel-tizrhfmonb-high-entropy-alloy-for-solar-thermal-energy-storage
#5
Huahai Shen, Jianwei Zhang, Jutao Hu, Jinchao Zhang, Yiwu Mao, Haiyan Xiao, Xiaosong Zhou, Xiaotao Zu
An equiatomic TiZrHfMoNb high-entropy alloy (HEA) was developed as a solar thermal energy storage material due to its outstanding performance of hydrogen absorption. The TiZrHfMoNb alloy transforms from a body-centered cubic (BCC) structure to a face-centered cubic (FCC) structure during hydrogen absorption and can reversibly transform back to the BCC structure after hydrogen desorption. The theoretical calculations demonstrated that before hydrogenation, the BCC structure for the alloy has more stable energy than the FCC structure while the FCC structure is preferred after hydrogenation...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759816/functionalized-porous-silica-based-nano-micro-particles-for-environmental-remediation-of-hazard-ions
#6
REVIEW
Chun Min Li, Xin Peng Wang, Zi Hao Jiao, Yu Sheng Zhang, Xiang Biao Yin, Xue Min Cui, Yue Zhou Wei
The adsorption and separation of hazard metal ions, radioactive nuclides, or minor actinides from wastewater and high-level radioactive waste liquids using functional silica-based nano/micro-particles modified with various inorganic materials or organic groups, has attracted significant attention since the discovery of ordered mesoporous silica-based substrates. Focusing on inorganic and organic modified materials, the synthesis methods and sorption performances for specific ions in aqueous solutions are summarized in this review...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759779/recovery-of-li-ni-0-33-mn-0-33-co-0-33-o%C3%A2-from-lithium-ion-battery-cathodes-aspects-of-degradation
#7
Tim Sieber, Jana Ducke, Anja Rietig, Thomas Langner, Jörg Acker
Nickel⁻manganese⁻cobalt oxides, with LiNi0.33 Mn0.33 Co0.33 O₂ (NMC) as the most prominent compound, are state-of-the-art cathode materials for lithium-ion batteries in electric vehicles. The growing market for electro mobility has led to a growing global demand for Li, Co, Ni, and Mn, making spent lithium-ion batteries a valuable secondary resource. Going forward, energy- and resource-inefficient pyrometallurgical and hydrometallurgical recycling strategies must be avoided. We presented an approach to recover NMC particles from spent lithium-ion battery cathodes while preserving their chemical and morphological properties, with a minimal use of chemicals...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759765/biosynthesized-highly-stable-au-c-nanodots-ideal-probes-for-the-selective-and-sensitive-detection-of-hg-2-ions
#8
Sada Venkateswarlu, Saravanan Govindaraju, Roopkumar Sangubotla, Jongsung Kim, Min-Ho Lee, Kyusik Yun
The enormous ongoing industrial development has caused serious water pollution which has become a major crisis, particularly in developing countries. Among the various water pollutants, non-biodegradable heavy metal ions are the most prevalent. Thus, trace-level detection of these metal ions using a simple technique is essential. To address this issue, we have developed a fluorescent probe of Au/C nanodots (GCNDs-gold carbon nanodots) using an eco-friendly method based on an extract from waste onion leaves ( Allium cepa-red onions )...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759762/strain-tunable-visible-light-responsive-photocatalytic-properties-of-two-dimensional-cds-g-c%C3%A2-n%C3%A2-a-hybrid-density-functional-study
#9
Guangzhao Wang, Feng Zhou, Binfang Yuan, Shuyuan Xiao, Anlong Kuang, Mingmin Zhong, Suihu Dang, Xiaojiang Long, Wanli Zhang
By means of a hybrid density functional, we comprehensively investigate the energetic, electronic, optical properties, and band edge alignments of two-dimensional (2D) CdS/g-C 3 N 4 heterostructures by considering the effect of biaxial strain and pH value, so as to improve the photocatalytic activity. The results reveal that a CdS monolayer weakly contacts with g-C 3 N 4 , forming a type II van der Waals (vdW) heterostructure. The narrow bandgap makes CdS/g-C 3 N 4 suitable for absorbing visible light and the induced built-in electric field between the interface promotes the effective separation of photogenerated carriers...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30754724/the-self-assembly-of-lignin-and-its-application-in-nanoparticle-synthesis-a-short-review
#10
REVIEW
Pawan Kumar Mishra, Adam Ekielski
Lignin serves as a significant contributor to the natural stock of non-fossilized carbon, second only to cellulose in the biosphere. In this review article, we focus on the self-assembly properties of lignin and their contribution to its effective utilization and valorization. Traditionally, investigations on self-assembly properties of lignin have aimed at understanding the lignification process of the cell wall and using it for efficient delignification for commercial purposes. In recent years (mainly the last three years), an increased number of attempts and reports of technical-lignin nanostructure synthesis with controlled particle size and morphology have been published...
February 11, 2019: Nanomaterials
https://read.qxmd.com/read/30754722/micro-structured-polydopamine-films-via-pulsed-electrochemical-deposition
#11
Jing Lin, Sven Daboss, Dominik Blaimer, Christine Kranz
Polydopamine (PDA) films are interesting as smart functional materials, and their controlled structured formation plays a significant role in a wide range of applications ranging from cell adhesion to sensing and catalysis. A pulsed deposition technique is reported for micro-structuring polydopamine films using scanning electrochemical microscopy (SECM) in direct mode. Thereby, precise and reproducible film thicknesses of the deposited spots could be achieved ranging from 5.9 +/- 0.48 nm (1 pulse cycle) to 75...
February 11, 2019: Nanomaterials
https://read.qxmd.com/read/30754714/preparation-and-characterization-of-biomimetic-hydroxyapatite-nanocrystals-by-using-partially-hydrolyzed-keratin-as-template-agent
#12
Chunxia Gao, Ke Zhao, Liwei Lin, Jinyu Wang, Yang Liu, Peizhi Zhu
Hydroxyapatite (HA), a typical inorganic component of bone, is a widely utilized biomaterial for bone tissue repair and regeneration due to its excellent properties. Inspired by the recent findings on the important roles of protein in biomineralization and natural structure of fish scales, keratin was chosen as a template for modulating the assembly of HA nanocrystals. A series of HA nanocrystals with different sizes were synthesized by adjusting the concentration of partially hydrolyzed keratin. The structure and compositions of the prepared HA were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Raman spectrum, and Transmission electron microscopy (TEM)...
February 11, 2019: Nanomaterials
https://read.qxmd.com/read/30754695/preparation-of-tin-oxide-quantum-dots-in-aqueous-solution-and-applications-in-semiconductor-gas-sensors
#13
Jianqiao Liu, Weiting Xue, Guohua Jin, Zhaoxia Zhai, Jiarong Lv, Wusong Hong, Yuzhen Chen
Tin oxide quantum dots (QDs) were prepared in aqueous solution from the precursor of tin dichloride via a simple process of hydrolysis and oxidation. The average grain size of QDs was 1.9 nm. The hydrothermal treatment was used to control the average grain size, which increased to 2.7 and 4.0 nm when the operating temperatures of 125 and 225 °C were employed, respectively. The X-ray photoelectron spectroscopy (XPS) spectrum and X-ray diffraction analysis (XRD) pattern confirmed a rutile SnO₂ system for the QDs...
February 11, 2019: Nanomaterials
https://read.qxmd.com/read/30744215/luminescent-hydroxyapatite-doped-with-rare-earth-elements-for-biomedical-applications
#14
REVIEW
Ionela Andreea Neacsu, Alexandra Elena Stoica, Bogdan Stefan Vasile, Ecaterina Andronescu
One new, promising approach in the medical field is represented by hydroxyapatite doped with luminescent materials for biomedical luminescence imaging. The use of hydroxyapatite-based luminescent materials is an interesting area of research because of the attractive characteristics of such materials, which include biodegradability, bioactivity, biocompatibility, osteoconductivity, non-toxicity, and their non-inflammatory nature, as well their accessibility for surface adaptation. It is well known that hydroxyapatite, the predominant inorganic component of bones, serves a substantial role in tissue engineering, drug and gene delivery, and many other biomedical areas...
February 10, 2019: Nanomaterials
https://read.qxmd.com/read/30744193/electrical-properties-and-electromagnetic-interference-shielding-effectiveness-of-interlayered-systems-composed-by-carbon-nanotube-filled-carbon-nanofiber-mats-and-polymer-composites
#15
Claudia Angélica Ramírez-Herrera, Homero Gonzalez, Felipe de la Torre, Laura Benitez, José Gerardo Cabañas-Moreno, Karen Lozano
The demand for multifunctional requirements in aerospace, military, automobile, sports, and energy applications has encouraged the investigation of new composite materials. This study focuses on the development of multiwall carbon nanotube (MWCNT) filled polypropylene composites and carbon nanofiber composite mats. The developed systems were then used to prepare interlayered composites that exhibited improved electrical conductivity and electromagnetic interference (EMI) shielding efficiency. MWCNT-carbon nanofiber composite mats were developed by centrifugally spinning mixtures of MWCNT suspended in aqueous poly(vinyl alcohol) solutions...
February 10, 2019: Nanomaterials
https://read.qxmd.com/read/30744163/tunable-synthesis-of-mesoporous-carbons-from-fe%C3%A2-o-bdc-%C3%A2-for-chloramphenicol-antibiotic-remediation
#16
Thuan Van Tran, Duyen Thi Cam Nguyen, Hanh T N Le, Long Giang Bach, Dai-Viet N Vo, Seong Soo Hong, Tri-Quang T Phan, Trinh Duy Nguyen
Chloramphenicol (CAP) is commonly employed in veterinary clinics, but illegal and uncontrollable consumption can result in its potential contamination in environmental soil, and aquatic matrix, and thereby, regenerating microbial resistance, and antibiotic-resistant genes. Adsorption by efficient, and recyclable adsorbents such as mesoporous carbons (MPCs) is commonly regarded as a "green and sustainable" approach. Herein, the MPCs were facilely synthesized via the pyrolysis of the metal⁻organic framework Fe₃O(BDC)₃ with calcination temperatures ( x °C) between 600 and 900 °C under nitrogen atmosphere...
February 10, 2019: Nanomaterials
https://read.qxmd.com/read/30744160/biocellulose-for-incisional-hernia-repair-an-experimental-pilot-study
#17
Falk Rauchfuß, Julian Helble, Johanna Bruns, Olaf Dirsch, Uta Dahmen, Michael Ardelt, Utz Settmacher, Hubert Scheuerlein
Ventral or incisional hernia are a common disease pattern in general surgery. Mostcommonly, a mesh repair is used for reconstruction, whereby the mesh itself might causecomplications, like infections or adhesions. Biological materials, like biocellulose, might reducethese clinical problems substantially. In this prospective rodent study, a biocellulose mesh(produced by Gluconacetobacter xylinus) was implanted either by a sublay technique or assupplementation of the abdominal wall. After an observation period of 90 days, animals weresacrificed...
February 10, 2019: Nanomaterials
https://read.qxmd.com/read/30744133/investigation-of-the-surface-of-ga%C3%A2-sn%C3%A2-zn-eutectic-alloy-by-the-characterisation-of-oxide-nanofilms-obtained-by-the-touch-printing-method
#18
Alexandra Dobosz, Torben Daeneke, Ali Zavabeti, Bao Yue Zhang, Rebecca Orrell-Trigg, Kourosh Kalantar-Zadeh, Anna Wójcik, Wojciech Maziarz, Tomasz Gancarz
Ga⁻Sn⁻Zn eutectic alloy is a non-toxic liquid metal alloy which could be used in a multitude of applications, including as a heat transfer agent, in gas sensing, and in medicine. Alloys containing gallium readily oxidise in air, forming a thin oxide layer that influences the properties of liquid metals and which has not been studied. In this study, the oxide layer formed on Ga⁻Sn⁻Zn alloy was transferred at room temperature onto three substrates-quartz, glass and silicon. The contact angle between the liquid alloy and different substrates was determined...
February 9, 2019: Nanomaterials
https://read.qxmd.com/read/30744111/tailoring-upconversion-and-morphology-of-yb-eu-doped-y%C3%A2-o%C3%A2-nanostructures-by-acid-composition-mediation
#19
Daniela Nunes, Ana Pimentel, Mariana Matias, Tomás Freire, A Araújo, Filipe Silva, Patrícia Gaspar, Silvia Garcia, Patrícia A Carvalho, Elvira Fortunato, Rodrigo Martins
The present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y₂O₃:Yb3+ /Eu3+ . These nanostructures were formed through the dissociation of yttrium, ytterbium and europium oxides using acetic, hydrochloric and nitric acids, followed by a fast hydrothermal method assisted by microwave irradiation and subsequent calcination process. Structural characterization has been carried out by X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and scanning electron microscopy (SEM) both coupled with energy dispersive X-ray spectroscopy (EDS)...
February 9, 2019: Nanomaterials
https://read.qxmd.com/read/30744040/intracellular-imaging-with-genetically-encoded-rna-based-molecular-sensors
#20
REVIEW
Zhining Sun, Tony Nguyen, Kathleen McAuliffe, Mingxu You
Genetically encodable sensors have been widely used in the detection of intracellular molecules ranging from metal ions and metabolites to nucleic acids and proteins. These biosensors are capable of monitoring in real-time the cellular levels, locations, and cell-to-cell variations of the target compounds in living systems. Traditionally, the majority of these sensors have been developed based on fluorescent proteins. As an exciting alternative, genetically encoded RNA-based molecular sensors (GERMS) have emerged over the past few years for the intracellular imaging and detection of various biological targets...
February 8, 2019: Nanomaterials
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