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separation Nano particle

Najing Fu, Liteng Li, Kaijing Liu, Chan Kyung Kim, Jun Li, Tao Zhu, Jianheng Li, Baokun Tang
With the development of deep eutectic solvents (DESs), more DES-based functional materials have been explored and applied in various areas. In this work, a novel choline chloride-acrylic acid (ChCl-AA) DES polymer, on a 2D magnetic base, was prepared for the recognition of β-lactoglobulin (β-LG) biomacromolecules in milk and for the inhibition of common bacteria such as Escherichia coli (E. coli), Pseudomonas fluorescens (P. fluorescens), Staphylococcus aureus (S. aureus), and Bacillus subtilis (B. subtilis)...
May 15, 2019: Talanta
Hong-Shan Ren, Zhan-Fang Cao, Xin Wen, Shuai Wang, Hong Zhong, Zai-Kun Wu
In this paper, a magnetic nano-Fe3 O4 /triethanolamine/GO composite (TEA-GO-FE) was prepared by using graphene oxide (GO), triethanolamine (TEA), and ferric chloride. The result indicates that triethanolamine acted as an important role for the growing of Fe3 O4 and adsorption ability of composite material. The synthesis mechanism of TEA-GO-FE was investigated through the medium of SEM-EDS, XRD, FT-IR, and TEM. The characterization results indicated Fe3 O4 nanoparticles have been successfully loaded on the surface of graphene oxide and they were encapsulated by TEA and have excellent stability...
February 13, 2019: Environmental Science and Pollution Research International
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
Denis Gebauer, Stephan E Wolf
"Non-classical" notions consider formation pathways of crystalline materials where larger species than monomeric chemical constituents, i.e., ions or single molecules, play crucial roles, which are not covered by the classical theories dating back to the 1870s and 1920s. Providing an outline of "non-classical" nucleation, we demonstrate that pre-nucleation clusters (PNCs) can lie on alternative pathways to phase separation, where the very event of demixing is not primarily based on the sizes of the species forming, as in the classical view, but their dynamics...
February 12, 2019: Journal of the American Chemical Society
Victor U Weiss, Karin Wieland, Andreas Schwaighofer, Bernhard Lendl, Günter Allmaier
Gas-phase electrophoresis employing a nano Electrospray Differential Mobility Analyzer (nES DMA) aka Gas-phase Electrophoretic Mobility Molecular Analyzer (nES GEMMA) enables nanoparticle separation in the gas-phase according to their surface-dry diameter with number-based detection. Moreover, particles in the nanometer size range can be collected after size-selection on supporting materials. It has been shown by subsequent analyses employing orthogonal methods, for instance microscopic or antibody-based techniques, that the surface integrity of collected analytes remains intact...
February 8, 2019: Analytical Chemistry
Shujing Lin, Xiao Zhi, Di Chen, Fangfang Xia, Yihuan Shen, Jiaqi Niu, Shiyi Huang, Jie Song, Jianmin Miao, Daxiang Cui, Xianting Ding
White blood cells (WBCs) isolated from peripheral blood have been verified as important biomarkers for the diagnosis, treatment and prognosis of cancer. However, it's still under challenge to acquire high-purity WBCs, even by taking advantage of current microfluidic technology. Considering the universality of clinical magnetic activated cell sorting (MACS) method, new developments on microfluidic chip in combination of magnetic cells separation technologies may provide a fascinating approach for high-purity WBCs sorting and widely clinical application...
January 30, 2019: Biosensors & Bioelectronics
Izumi Yamane, Ayano Momose, Hideki Fujita, Eri Yoshimoto, Akie Kikuchi-Kinoshita, Izuru Kawamura, Akira Naito
Glucagon is a 29 amino acid peptide hormone secreted by pancreatic α-cells and interacts with specific receptors located in various organs. Glucagon tends to form gel-like fibril aggregates that are cytotoxic because they activate apoptotic signaling pathways. To understand mechanism of fibril formation, we investigated the structure and kinetics of glucagon fibril formation using 13 C solid-state NMR spectroscopy. In aqueous acetic acid solution at pH 3.3, distorted α-helical structure appeared around Gly4, Leu14, Ala19 and Leu26 in the monomeric form...
January 25, 2019: Chemistry and Physics of Lipids
Nasim Baimani, Parviz Aberoomand Azar, Syed Waqif Husain, Homayon Ahmad Panahi, Ali Mehramizi
This study introduced a developed approach for the use of polyester dendrimer during the imprinting process to raise the number of recognized sites in the polymer matrix and improve its identification ability. Photo-responsive molecular imprinting polymers were synthesized on modified magnetic nano-particles involving polyester dendrimer which uses the reactivity between allyl glycidyl ether and acrylic acid for the high-yielding assembly by surface polymerization. The photo responsive molecular imprinting polymers were constructed using methylprednisoloneacetate as the template, water-soluble azobenzene involving 5-[(4, 3-(methacryloyloxy) phenyl) diazenyl] dihydroxy aniline as the novel functional monomer, and ethylene glycol dimethacrylate as the cross-linker...
January 28, 2019: Journal of Separation Science
Joseph A Kraai, Gregory L Rorrer, Alan X Wang
This study showed that a nanostructured, highly-porous stationary phase composed of randomly-deposited biosilica frustules isolated from living cells of diatom Pinnularia sp. significantly improved the conventional thin-layer chromatography (TLC) based separation of the triphenylmethane dyes malachite green and fast green relative to silica gel by two mobile phases (9:1:1 v/v 1-butanol:ethanol:water, 5:1:2 v/v 1-butanol:acetic acid:water). Although both stationary phases were composed of amorphous silica rich in silanol groups with particle size of 10-12 μm, diatom biosilica frustules were highly porous, hollow shells with surface structure dominated by 200 nm pore arrays...
January 14, 2019: Journal of Chromatography. A
Alessandro Magazzù, Agnese Callegari, Juan Pablo Staforelli, Andrea Gambassi, Siegfried Dietrich, Giovanni Volpe
Critical Casimir forces can play an important role for applications in nano-science and nano-technology, owing to their piconewton strength, nanometric action range, fine tunability as a function of temperature, and exquisite dependence on the surface properties of the involved objects. Here, we investigate the effects of critical Casimir forces on the free dynamics of a pair of colloidal particles dispersed in the bulk of a near-critical binary liquid solvent, using blinking optical tweezers. In particular, we measure the time evolution of the distance between the two colloids to determine their relative diffusion and drift velocity...
January 24, 2019: Soft Matter
Virginia Moreno, Mohammed Zougagh, Ángel Ríos
Analytical nanometrology is a present challenge in today's analytical science, particularly from a practical point of view and when it is addressed to routine/control laboratories. In this way, a screening-confirmation approach is described for the characterization and distinction between titanium dioxide nano/micro-particles in sugary food samples. The first step involves the confirmation of the presence of TiO2 in the sample (used as additive E171 in sugary samples), using a portable Raman spectrometer, in which the crystalline structure of TiO2 (anatase or rutile) in the positive samples can be also obtained in this step...
March 7, 2019: Analytica Chimica Acta
Bharath Babu Nunna, Debdyuti Mandal, Joo Un Lee, Harsimranjit Singh, Shiqiang Zhuang, Durgamadhab Misra, Md Nasir Uddin Bhuyian, Eon Soo Lee
Integrating microfluidics with biosensors is of great research interest with the increasing trend of lab-on-the chip and point-of-care devices. Though there have been numerous studies performed relating microfluidics to the biosensing mechanisms, the study of the sensitivity variation due to microfluidic flow is very much limited. In this paper, the sensitivity of interdigitated electrodes was evaluated at the static drop condition and the microfluidic flow condition. In addition, this study demonstrates the use of gold nanoparticles to enhance the sensor signal response and provides experimental results of the capacitance difference during cancer antigen-125 (CA-125) antigen-antibody conjugation at multiple concentrations of CA-125 antigens...
January 17, 2019: Nano Convergence
Chang Min Park, Young Mo Kim, Ki-Hyun Kim, Dengjun Wang, Chunming Su, Yeomin Yoon
Toxic substances such as heavy metals or persistent organic pollutants raise global environmental concerns. Thus, diverse water decontamination approaches using nano-adsorbents and/or photocatalysts based on nanotechnology are being developed. Particularly, many studies have examined the removal of organic and inorganic contaminants with novel graphene-based nano spinel ferrites (GNSFs) as potential cost-effective alternatives to traditionally used materials, owing to their enhanced physical and chemical properties...
January 9, 2019: Chemosphere
Chunwei Yang, Baixiang Ren, Dong Wang, Qian Tang
The coupling of electrolysis and the peroxydisulfate (PDS) activation was selected in this study to degrade solution-phase 2,4,6-trichlorophenol (TCP). To enhance the PDS activation efficiency and catalytic recycling ratio, a novel magnetic activator, nano iron coated on neodymium iron boron/activated carbon nanocomposite (Nano-Fe@NdFeB/AC), was synthesized and utilized as catalytic particle electrodes. To increase the mass transfer ability, a novel magnetic internal circulation electrolytic reactor (MICE) was established...
January 14, 2019: Environmental Technology
Selvakumar Duraipandi, Vijaya Selvakumar
BACKGROUND: Anu Tailam, an Ayurvedic medicated oil where 'anu' meant for atom and 'tailam' meant for oil and virtually meant for 'oil of subtle or atomic size particles'. Since the major active ingredients in this formulation are incorporated from the polyherbal decoction, it is expected to contain predominantly water soluble ingredients. OBJECTIVES: It is hypothesized that these polar active botanical ingredients are present in the formulation should be either suspended in the form of submicron particles or entrapped in the submicron vesicular structures since the formulation did not show any precipitation or phase separation instead showed a monophasic oily liquid with very little moisture...
January 8, 2019: Journal of Ayurveda and Integrative Medicine
Zhe Wang, Yanqiu Jiang, Yudong Li, Hang Huo, Tingting Zhao, Defeng Li, Kaifeng Lin, Xianzhu Xu
A series of multi-scaled cementite/iron porous carbon (CIPC-T) composites with extremely low nitrogen content and millimeter-size spherical format are successfully prepared through a simple carbothermal pyrolysis of exchanged resin spheres by ferric oxalate anions. CIPC-T samples are characterized to be composted of highly dispersed core-shell structured Fe3C/Fe @ graphitic carbon (CI@GC) nano-particles embedded in porous amorphous carbon frame. The mechanism for the formation of the composites is proposed based on the results of XRD, SEM, TEM and TGA...
January 8, 2019: Chemistry: a European Journal
Qiang Zhang, Junqing Li, Xingguang Liu
Surface plasmon polaritons carry an intrinsic transverse spin angular momentum which is locked to their propagation direction due to the quantum spin Hall effect of light. We study the chirality-sorting lateral optical forces arising from this phenomenon in a Kretschmann configuration. We show that the characteristics of surface plasmon polaritons are affected by small changes of the environment's chirality. This property can be utilized to detect the medium's chirality in the macro-world. Furthermore, we explain how the the lateral forces and optical torques interact with the chirality of nano-particles located or adsorbed in the vicinity of the surface in the micro-world...
December 21, 2018: Physical Chemistry Chemical Physics: PCCP
Jesús Sot, Sebastião A Mendanha-Neto, Jon V Busto, Aritz B García-Arribas, Shengrong Li, Stephen W Burgess, Walt A Shaw, David Gil-Carton, Félix M Goñi, Alicia Alonso
Lipid bilayers of different phospholipid compositions have been prepared, in the form of vesicles, or of supported lipid bilayers, and doped with AuroraTM at 0.1 mol%. AuroraTM consists of an Au55 gold nanoparticle (about 1.4 nm in diameter) capped with triphenylphosphine ligands and a single diglyceride (distearoyl glycerol) ligand. Gold nanoparticles have been incorporated in the past inside liposomes, or grafted onto their surfaces, with diagnostic or therapeutic aims. Including the gold nanoparticles in a stable form within the lipid bilayers has serious technical difficulties...
November 28, 2018: Chemistry and Physics of Lipids
Zhan Wang, Stephen E Taylor, Prabhakar Sharma, Markus Flury
Extraction and quantification of nano- and microplastics from sediments and soils is challenging. Although no standard method has been established so far, flotation is commonly used to separate plastic from mineral material. The objective of this study was to test the efficiency of flotation for the extraction of nano- and microplastics from biosolids and soil. We spiked biosolids and soil samples with polystyrene nano- and microbeads (0.05, 1.0, 2.6, 4.8, and 100 μm diameter). Different extraction methods (w/ and w/o H2O2 digestion) were tested, and plastic beads were separated from mineral particles by flotation in a ZnCl2 solution...
2018: PloS One
R Iqbal, B Majhy, Amy Q Shen, A K Sen
Understanding the formation of different morphological patterns depending on the particle size and surface wettability has great relevance in the separation, mixing and concentration of micro/nano particles and biological entities. We report the evaporation and morphological patterns of evaporating bi-dispersed colloidal droplets on hydrophilic and hydrophobic surfaces. To explain the underlying mechanisms of various particle distribution patterns, we propose a phenomenological model that accounts for the drag force, van der Waals and electrostatic interaction forces, and surface tension force acting on the particles...
November 26, 2018: Soft Matter
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