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separation Nano particle

Zahra Karbalaei Mirza Shahrbabaki, Farshid Pahlevani, Narjes Gorjizadeh, Rumana Hossain, Mohammad Bagher Ghasemian, Vaibhav Gaikwad, Veena Sahajwalla
The abundant application of metallized paper and the quick growth of their wastes lead to the removal of a huge amount of valuable resources from economic cycle. In this work, for the first-time, the thermal micronizing technique has been used to directly transform the metallized paper wastes to Al-Si nano-rod and Al nano-particles for use as the input in different manufacturing sectors such as additive manufacturing or composite fabrication. Structure of metallized paper has been investigated using FT-IR analysis and first-principle plane-wave calculation...
October 12, 2018: Materials
M B Tahir, M Sagir, K Shahzad
Highly efficient, visible light-driven and a novel ternary hybrid photocatalyst WO3 -TiO2 -g-C3 N4 with robust stabilities and versatile properties has been synthesized through facile hydrothermal method. This study considers the photo-degradation of aspirin (acetylsalicylate) and caffeine (methyl-theobromine) via photocatalysts (WO3 , WO3 /TiO2, and WO3 /TiO2 /g-C3 N4 (WTCN) composite) under visible-light irradiation. The SEM and TEM images show the formation of WO3 nanoparticles with orthorhombic structure and average particle size of 65 nm...
September 24, 2018: Journal of Hazardous Materials
Mikhail S Ermolin, Petr S Fedotov, Alexandr I Ivaneev, Vasily K Karandashev, Andrey A Burmistrov, Yury G Tatsy
A comprehensive approach has been developed to the assessment of composition and properties of atmospherically deposited dust in the area affected by a copper smelter. The approach is based on the analysis of initial dust samples, dynamic leaching of water soluble fractions in a rotating coiled column (RCC) followed by the determination of recovered elements and characterization of size, morphology and elemental composition of nano-, submicron, and micron par ticles of dust separated using field-flow fractionation in a RCC...
October 3, 2018: Environmental Science and Pollution Research International
V Sokolova, K Loza, T Knuschke, J Heinen-Weiler, H Jastrow, M Hasenberg, J Buer, A M Westendorf, M Gunzer, M Epple
Nanoparticles can act as transporters for synthetic molecules and biomolecules into cells, also in immunology. Antigen-presenting cells like dendritic cells are important targets for immunotherapy in nanomedicine. Therefore, we have used primary murine bone marrow-derived phagocytosing cells (bmPCs), i.e. dendritic cells and macrophages, to study their interaction with spherical barium sulphate particles of different size (40 nm, 420 nm, and 1 µm) and to follow their uptake pathway. Barium sulphate is chemically and biologically inert (no dissolution, no catalytic effects), i...
September 18, 2018: Acta Biomaterialia
Yingxin Liu, Michael Agthe, Michaela Salajková, Korneliya Gordeyeva, Valentina Guccini, Andreas Fall, Germán Salazar-Alvarez, Christina Schütz, Lennart Bergström
Assembly of bio-based nano-sized particles into complex architectures and morphologies is an area of fundamental interest and technical importance. We have investigated the assembly of sulfonated cellulose nanocrystals (CNC) dispersed in a shrinking levitating aqueous drop using time-resolved small angle X-ray scattering (SAXS). Analysis of the scaling of the particle separation distance (d) with particle concentration (c) was used to follow the transition of CNC dispersions from an isotropic state at 1-2 vol% to a compressed nematic state at particle concentrations above 30 vol%...
October 4, 2018: Nanoscale
Su-Mi Hur, Vikram Thapar, Abelardo Ramírez-Hernández, Paul F Nealey, Juan J de Pablo
Defects in highly ordered self-assembled block copolymers represent an important roadblock toward the adoption of these materials in a wide range of applications. This work examines the pathways for annihilation of defects in symmetric diblock copolymers in the context of directed assembly using patterned substrates. Past theoretical and computational studies of such systems have predicted minimum free energy pathways that are characteristic of an activated process. However, they have been limited to adjacent dislocations with opposite Burgers vectors...
October 8, 2018: ACS Nano
Azam Hassanpoor, Masoud Mirzaei, Mahdi Niknam Shahrak, Anna M Majcher
A magnetic metal organic framework {[Cu(but-1,4-dc)0.5(N3)(H2O)]·H2O}n (MFUM-1(Cu)) (but-1,4-dc = butane-1,4-dicarboxylate) was synthesized and characterized structurally and magnetically. In MFUM-1(Cu), each CuII ion has a distorted octahedral geometry with an obvious Jahn-Teller distortion, where the coordination environment is composed of mixed EO-azido/aliphatic based carboxylate/H2O threefold bridges. These bridges extend the structure of MFUM-1(Cu) in two dimensions by covalent connectivity and form square-shaped channels...
October 9, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Oliver Wrede, Yvonne Reimann, Stefan Lülsdorf, Daniel Emmrich, Kristina Schneider, Andreas Josef Schmid, Diana Zauser, Yvonne Hannappel, André Beyer, Ralf Schweins, Armin Gölzhäuser, Thomas Hellweg, Thomas Sottmann
The use of smart colloidal microgels for advanced applications critically depends on their response kinetics. We use pressure jump small angle neutron scattering with supreme time resolution to study the rapid volume phase transition kinetics of such microgels. Utilizing the pressure induced microphase separation inside the microgels we were able to resolve their collapse and swelling kinetics. While the collapse occurs on a time scale of 10 ms, the particle swelling turned out to be much faster. Photon correlation spectroscopy and static small angle neutron scattering unambiguously show, that the much slower collapse can be associated with the complex particle architecture exhibiting a loosely-crosslinked outer region and a denser inner core region...
September 13, 2018: Scientific Reports
Mahsa Sabouri, Aniseh Samadi, Saman Ahmad Nasrollahi, Effat Sadat Farboud, Bahareh Mirrahimi, Hournaz Hassanzadeh, Mansour Nassiri Kashani, Rassoul Dinarvand, Alireza Firooz
BACKGROUND AND AIM: Acne vulgaris is a common inflammatory skin condition which is treated using Tretinoin (TRE), a widely used retinoid. Nano emulations (NEs) are colloidal nano-sized particles that enhance the therapeutic efficacy of TRE and minimize adverse effects. This study is aimed at developing a TRE-loaded NE (NE-TRE) and at assessing the therapeutic effects of the formulation in acne vulgaris lesions, compared to conventional 0.05% TRE emulsion. METHOD: The high energy emulsification method was used to make NE-TRE...
2018: Skin Pharmacology and Physiology
Tatiana Abashina, Mikhail Vainshtein, Saara Korpela, Timo Korpela
Gelatin added in certain concentration into the density gradient mixtures allows to solidify and melt the gradient reversibly. Such a method was applied to separation of partially disintegrated Escherichia coli VKM B-125 cells in discontinuous sucrose gradient which was optimized to obtain small round "nano-cells" free from other cell components. Gelatin added to the sucrose solutions had the advantages: i) accurate gradient layers were formed, ii) gelatin did not interfere with the cells and sub-particles during centrifugation, iii) solidified gelatin allowed to cut out the separated cell components, and iv) gelatin allowed to prepare ready-made solidified gradient centrifugation tubes into storage...
September 5, 2018: Journal of Microbiological Methods
Hind El Hadri, Julien Gigault, Jiaojie Tan, Vincent A Hackley
Applications of asymmetrical flow field-flow fractionation (AF4) continue to expand rapidly in the fields of nanotechnology and biotechnology. In particular, AF4 has proven valuable for the separation and analysis of particles, biomolecular species (e.g., proteins, bacteria) and polymers (natural and synthetic), ranging in size from a few nanometers to several micrometers. The separation of non-spheroidal structures (e.g., rods, tubes, etc.) with primary dimensions in the nanometer regime, is a particularly challenging application deserving of greater study and consideration...
November 2018: Analytical and Bioanalytical Chemistry
Xin Zhang, Yang He, Jia Liu, Mark E Bowden, Libor Kovarik, Scott X Mao, Chongmin Wang, James J De Yoreo, Kevin M Rosso
Biominerals serve as critical structures of living systems and play important roles in biochemical processes. Understanding their crystallization mechanisms is therefore central to many areas of biology, biogeoscience, and biochemistry. Some biominerals, such as bone and dentin, are hierarchical nanocomposite structures constructed by sequential addition of individual oriented nanocrystals. The driving forces that enable this oriented assembly are still poorly understood, with advances in understanding limited in part by the availability of techniques that can precisely measure the delicate interactions between nanocrystals as a function of their separation distance and mutual orientation...
September 2018: Nature Protocols
Weiwei Cao, Xi Wang, Qiang Li, Xuefeng Peng, Lina Wang, Peili Li, Zhiwen Ye, Xiaodong Xing
Designing cationic nano-antimicrobial is a promising solution for combating drug resistant microbes. In this work, hydrophilic cationic copolymer was applied for the surface functionalization of nanodiamonds (NDs) aiming at developing a highly membrane-active nano-antibacterial agent with satisfactory selectivity. As a result, after functionalization, the increased repulsive forces within NDs and interaction with solvent molecular network made the heavily aggregated pristine NDs break down into tiny nanoparticles with particle size ranging from 10 to 100 nm...
November 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Di Wu, Na Hu, Jichao Liu, Guangsen Fan, Xiuting Li, Jing Sun, Chunji Dai, Yourui Suo, Guoliang Li, Yongning Wu
Recently, exploitation of nanozymes for signal amplification has aroused extensive research interesting in the fields of analytical chemistry and nanoscience. Herein, we introduced a new sensing strategy based on the ascorbic acid (AA) precisely regulated Ag3 PO4 nanozyme for signal amplification. AA can reduce the partial Ag+ on the surface of Ag3 PO4 nano-particles to form Ag° particles and result in the formation of Ag°/Ag3 PO4 heterostructure. Due to surface plasmon resonance (SPR), the Ag° particles in heterostructure can act as the co-catalysts to enhance the electron-hole separation and the interfacial charge transfer, leading to a highly efficient oxidase mimicking activity for catalyzing the oxidation of the substrate of 3,3,5,5-tetramethylbenzidine (TMB) under visible light...
December 1, 2018: Talanta
Yu Hoshino, Toshiki Jibiki, Masahiko Nakamoto, Yoshiko Miura
The acid dissociation constants (p Ka values) of Brønsted acids at the active sites of proteins are reversibly modulated by intramolecular electrostatic interactions with neighboring ions in a reaction cycle. The resulting p Ka shift is crucial for the proteins to capture, transfer, and release target ions. On the other hand, reversible p Ka modulation through electrostatic interactions in synthetic polymer materials has seldom been realized because the interactions are strongly shielded by solvation water molecules in aqueous media...
September 19, 2018: ACS Applied Materials & Interfaces
Yu Yang, Huang Chen, Matthew A Beckner, Piliang Xiang, Joann Juan Lu, Chengxi Cao, Shaorong Liu
We report that we can achieve extremely high separation efficiencies using a narrow, open, tubular (NOT) column for liquid-chromatographic separations, and we can carry out these separations under an elution pressure of no more than 50 bar. To improve the separation efficiency in packed-column liquid chromatography, one of the most effective approaches is to reduce the monodispersed-particle sizes. A direct consequence of reduced particle size is an increased elution pressure. High efficiencies have been obtained in ultrahigh-performance liquid chromatography (UPLC) using 1-2 μm or even submicron particles, and high elution pressures (greater than 1000 bar) are commonly used to carry out these separations...
September 18, 2018: Analytical Chemistry
Jie Li, Bing Xie, Kai Xia, Yingchun Li, Jing Han, Chunmao Zhao
Nano titanium dioxide (TiO₂) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO₂-chitosan (STC) and TiO₂-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO₂ nanoparticles on the cross-linked chitosan microsphere...
August 10, 2018: Materials
Riyadh Al-Attabi, Yosry Morsi, Jürg A Schütz, Ludovic F Dumée
The development of fibrous air filters exhibiting high air filtration efficiency, low energy consumption, and self-cleaning properties is a critical challenge to generate the next generation of resilient air filtration systems. Nano-fibrous mats typically exhibit higher particle capture efficiency but may also lead to higher airflow resistance compared to macro-fibrous materials due to their tighter structure. In this paper, novel catalytic membranes mats were fabricated through a one-pot synthesis from ammonium tetrathiomolybdate (ATTM) doped poly(acrylonitrile) (PAN) nanofibers for sub-micron diameter aerosol particle removal...
January 10, 2019: Science of the Total Environment
A Mateos-Maroto, A Guerrero-Martínez, R G Rubio, F Ortega, F Martínez-Pedrero
Some biological microorganisms can crawl or swim due to coordinated motions of their cytoskeleton or the flagella located inside their bodies, which push the cells forward through intracellular forces. To date, there is no demonstration of synthetic systems propelling at low Reynolds number via the precise actuation of the material confined within an enclosing lipid membrane. Here, we report lipid vesicles and other more complex self-assembled biohybrid structures able to propel due to the advection flows generated by the actuated rotation of the superparamagnetic particles they contain...
September 5, 2018: ACS Applied Materials & Interfaces
Xiaofei Guo, Chuanxiang Qin, Mingyue Zhu, Jian-Jun Wang, Jun Sun, Lixing Dai
A composite photocatalyst, with a BiOI/TiO2 heterojunction supported on carboxyl polystyrene spheres, was prepared using a two step hydrothermal reaction method. The products were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results show that the polystyrene microspheres were covered with smaller-sized BiOI microspheres, while nano-sized TiO2 particles were deposited on the surface of the flower-like BiOI microspheres. As an internal electric field exists when BiOI is hybridized with TiO2, the photogenerated carriers could be separated effectively and the resulting composite photocatalyst PS/BiOI/TiO2 had better performance for degrading rhodamine B in aqueous solution under visible-light irradiation with a 40 W incandescent lamp than that of PS/BiOI...
September 11, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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