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https://www.readbyqxmd.com/read/28719053/microwave-assisted-synthesis-of-metal-organic-framework-mil-101-nanocrystals-as-sorbent-and-pseudostationary-phase-in-capillary-electrophoresis-for-the-separation-of-anthraquinones-in-environmental-water-samples
#1
Yue Liu, Jia Hu, Yan Li, Yun-Tao Shang, Jia-Qi Wang, Ye Zhang, Zhong-Liang Wang
In this work, a CE method was developed to separate five anthraquinones: aloe-emodin, rhein, emodin, chrysophanol and physcion. The CE method used a nano-sized metal organic framework MIL-101 (nMIL-101) as pseudostationary phase (PSP) and sorbent for dispersed particle extraction (DPE). The nMIL-101 was synthesized by microwave technique and was characterized by UV-vis, TEM, Zeta potential, X-ray diffraction spectrometry and micropore physisorption. In this method, anthraquinones were adsorbed by nMIL-101 of a fast kinetics within 10 min and then separated by CE...
July 18, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28718292/structural-characterization-of-ordered-non-close-packed-functionalized-silica-nanoparticles-on-gold-surfaces
#2
Christian Grunewald, Madlen Schmudde, Christina Graf, Thomas Risse
Nanostructured surfaces play an important role in modern science and technology. In particular, ordered arrangements of nonclose-packed nanoparticles created by self-assembly offer a versatile route to prepare systems, which can be used in various applications such as sensing, plasmonic devices or antireflection coatings. Self-assembly based systems are particularly appealing as preparation is rather simple. The ability of nanoparticle systems to form nonclosed packed monolayers by self-assembly depends on the balance of various energetic contributions in particular the adsorption energy, the lateral barrier for diffusion and the repulsion between particles...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28717975/development-of-a-novel-polymeric-nanocomposite-complex-for-drugs-with-low-bioavailability
#3
Mduduzi N Sithole, Yahya E Choonara, Lisa C du Toit, Pradeep Kumar, Thashree Marimuthu, Pierre P D Kondiah, Viness Pillay
Semi-synthetic biopolymer complex (SSBC) nanoparticles were investigated as a potential oral drug delivery system to enhance the bioavailability of a poorly water-soluble model drug acyclovir (ACV). The SSBCs were prepared from cross-linking of hydroxyl groups on hyaluronic acid (HA) with poly(acrylic acid) (PAA) resulting in ether linkages. Thereafter, conjugation of 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) onto HA-PAA was accomplished using a 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC)/N-hydroxysuccinimide (NHS)-promoted coupling reaction...
July 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28715747/alumina-activated-carbon-nano-composites-synthesis-and-application-in-sulphide-ion-removal-from-water
#4
Ushadevi Balasubramani, Ranjithkumar Venkatesh, Sangeetha Subramaniam, Gayathri Gopalakrishnan, Vairam Sundararajan
An investigation of adsorption of sulphide ion (S(2-)) in water onto carbon/alumina nano-composites synthesized from aluminium carboxylate precursors, in presence of HCl, NaOH, NaCl and surfactant is reported in this paper. A controlled oxygen free pyrolytic technique has been adopted for the synthesis of nano-composites, using acetate, acetyl acetonate, lactate and distearate of aluminium and activated carbon. XRD, SEM and TEM studies of the composites show that they contain clusters made of nano carbon particles of size 50-130nm into which nano alumina particles of size around 10nm are dispersed...
July 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28715736/highly-effective-cs-removal-by-turbidity-free-potassium-copper-hexacyanoferrate-immobilized-magnetic-hydrogels
#5
Yun Kon Kim, Taegeon Kim, Yonghwan Kim, David Harbottle, Jae W Lee
Potassium copper hexacyanoferrate-immobilized magnetic hydrogel (MHPVA) has been synthesized via a facile freeze/thaw crosslinking method. The citric acid coated Fe3O4 is embedded into the hydrogel matrix to facilitate the dispersion of nano-sized KCuHCF particles for Cs(+) removal, followed by the rapid recovery of the composite in a magnetic field. The Cs(+) adsorption behavior of the MHPVA is fitted well with the Langmuir isotherm and the pseudo-second-order kinetic model. The MHPVA exhibits both high Cs(+) adsorption capacity (82...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28715175/airborne-nanoparticle-release-and-toxicological-risk-from-metal-oxide-coated-textiles-toward-a-multi-scale-safe-by-design-approach
#6
Paride Mantecca, Kaja Kasemets, Archana Deokar, Ilana Perelshtein, Aharon Gedanken, Yeon Kyoung Bahk, Baharh Kianfar, Jing Wang
Nano metal oxides have been proposed as alternatives to Silver (Ag) nanoparticles (NPs) for antibacterial coatings. Here cotton and polyester-cotton fabrics were sonochemically coated with Zinc oxide (ZnO) ZnO and Copper oxide (CuO) CuO NPs. By varying the reaction solvent (water or ethanol), NPs with different sizes and shapes were synthesized. The cytotoxic and pro-inflammatory effects of studied NPs were investigated in vitro in human alveolar epithelial A549 and macrophage-like THP1 cells. To understand the potential respiratory impact of the NPs, the coated textiles were subjected to the abrasion tests and the released airborne particles were measured...
July 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28714596/multifunctional-nanotube-mucoadhesive-poly-methyl-vinyl-ether-co-maleic-acid-hydroxypropyl-methylcellulose-acetate-succinate-composite-for-site-specific-oral-drug-delivery
#7
Nattha Kerdsakundee, Wei Li, João Pedro Martins, Zehua Liu, Feng Zhang, Marianna Kemell, Alexandra Correia, Yaping Ding, Mikko Airavaara, Jouni Hirvonen, Ruedeekorn Wiwattanapatapee, Hélder A Santos
An advanced oral drug delivery system that can effectively deliver drugs with poor oral bioavailability is strongly desirable. Herein, a multifunctional nano-in-micro structured composite is developed by encapsulation of the mucoadhesive poly(methyl vinyl ether-co-maleic acid) modified halloysite nanotubes (HNTs) with the pH-responsive hydroxypropyl methylcellulose acetate succinate by the microfluidics to control the drug release, increase cell-particle interaction, and improve drug absorption. The microparticles show spherical shape, homogeneous particle size distribution (58 ± 1 µm), and pH-responsive dissolution behavior at pH > 6, and they prevent the premature release of curcumin in simulated pH conditions of the stomach and immediately release the curcumin in simulated pH conditions of the small intestine...
July 17, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28711833/assessment-of-nanoparticles-release-into-the-environment-during-drilling-of-carbon-nanotubes-epoxy-and-carbon-nanofibres-epoxy-nanocomposites
#8
Kristof Starost, Evelien Frijns, Jo Van Laer, Nadimul Faisal, Ainhoa Egizabal, Cristina Elizextea, Maria Blazquez, Inge Nelissen, James Njuguna
The risk assessment, exposure and understanding of the release of embedded carbon nanotubes (CNTs) and carbon nanofibers (CNFs) from commercial high performance composites during machining processes are yet to be fully evaluated and quantified. In this study, CNTs and CNFs were dispersed in epoxy matrix through calendaring process to form nanocomposites. The automated drilling was carried out in a specially designed drilling chamber that allowed elimination of background noise from the measurements. Emission measurements were taken using condensed particle counter (CPC), scanning mobility particle sizer (SMPS) and DMS50 Fast Particulate Size Spectrometer...
June 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28710475/isotopic-signature-and-nano-texture-of-cesium-rich-micro-particles-release-of-uranium-and-fission-products-from-the-fukushima-daiichi-nuclear-power-plant
#9
Junpei Imoto, Asumi Ochiai, Genki Furuki, Mizuki Suetake, Ryohei Ikehara, Kenji Horie, Mami Takehara, Shinya Yamasaki, Kenji Nanba, Toshihiko Ohnuki, Gareth T W Law, Bernd Grambow, Rodney C Ewing, Satoshi Utsunomiya
Highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) provide nano-scale chemical fingerprints of the 2011 tragedy. U, Cs, Ba, Rb, K, and Ca isotopic ratios were determined on three CsMPs (3.79-780 Bq) collected within ~10 km from the FDNPP to determine the CsMPs' origin and mechanism of formation. Apart from crystalline Fe-pollucite, CsFeSi2O6 · nH2O, CsMPs are comprised mainly of Zn-Fe-oxide nanoparticles in a SiO2 glass matrix (up to ~30 wt% of Cs and ~1 wt% of U mainly associated with Zn-Fe-oxide)...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710378/sub-nanometer-surface-chemistry-and-orbital-hybridization-in-lanthanum-doped-ceria-nano-catalysts-revealed-by-3d-electron-microscopy
#10
Sean M Collins, Susana Fernandez-Garcia, José J Calvino, Paul A Midgley
Surface chemical composition, electronic structure, and bonding characteristics determine catalytic activity but are not resolved for individual catalyst particles by conventional spectroscopy. In particular, the nano-scale three-dimensional distribution of aliovalent lanthanide dopants in ceria catalysts and their effect on the surface electronic structure remains unclear. Here, we reveal the surface segregation of dopant cations and oxygen vacancies and observe bonding changes in lanthanum-doped ceria catalyst particle aggregates with sub-nanometer precision using a new model-based spectroscopic tomography approach...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709903/targeted-delivery-of-cyclosporine-a-by-polymeric-nanocarriers-improves-the-therapy-of-inflammatory-bowel-disease-in-a-relevant-mouse-model
#11
Ana Melero, Christina Draheim, Steffi Hansen, Elisa Giner, Juan José Carreras, Raquel Talens-Visconti, Teresa María Garrigues, José Esteban Peris, Ma Carmen Recio, Rosa Giner, Claus-Michael Lehr
The therapy of inflammatory bowel diseases is still rather inefficient, and about 80% of patients require surgery at some stage. Improving the treatments by more efficient medication is, therefore, an urgent medical need. The objective of this project was to demonstrate targeted delivery of Cyclosporine-A (CYA) to the inflamed areas of the intestinal mucosa after oral administration, enabling improved alleviation of the symptoms and, at the same time, reduced systemic drug absorption and associated adverse effects...
July 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28709896/comparative-study-on-antifungal-activities-of-chitosan-nanoparticles-and-chitosan-silver-nano-composites-against-fusarium-oxysporum-species-complex
#12
S H S Dananjaya, W K C U Erandani, Cheol-Hee Kim, Chamilani Nikapitiya, Jehee Lee, Mahanama De Zoysa
Though the metal nanoparticles (NPs) have been shown favorable results against fungal diseases, erratic environmental toxicity of NPs have raised serious concerns against their applications. Hence, it is vital to modify antifungal compounds into safe substitutes over synthetic chemicals. In this study, antifungal effects of chitosan nanoparticles (CNPs) and chitosan silver nanocomposites (CAgNCs) were compared against Fusarium oxysporum species complex. CNPs and CAgNCs were synthesized, characterized and compared based on the transmission electron microscope, X-ray diffraction, UV-vis absorbance spectra, particle size distribution, zeta potential and thermal stability analysis...
July 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28709016/spray-drying-assisted-reassembly-of-uniform-and-large-micro-sized-mil-101-microparticles-with-controllable-morphologies-for-benzene-adsorption
#13
Aijian Zhang, Xin-Yu Li, Shengyu Zhang, Zhikai Yu, Xingmin Gao, Xiangru Wei, Zhangxiong Wu, Winston Duo Wu, Xiao Dong Chen
Significant research has been focused on the synthesis of metal-organic frameworks (MOFs) with controllable compositions and structures, while much fewer works have been devoted to the construction of large micro-sized MOFs with uniform sizes and morphologies, which could be beneficial for practical applications. In this paper, a unique microfluidic jet spray drying technology has been adopted to reassemble nano-sized MIL-101 building blocks into hierarchical microparticles with uniform and large particle sizes...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28708390/softwood-lignin-self-assembly-for-nanomaterial-design
#14
Stefan Salentinig, Mark Schubert
Lignin is a natural, renewable biopolymer synthesized by plants. It is a macromolecule consisting of aromatic structures with high density of functional groups making it an ideal precursor for the design of sustainable biomaterials for applications such as drug delivery. The rational design of these materials requires an in-depth understanding of the underlying lignin self-assembly in solution. Colloidal transformations from nano-sized lignin assemblies to sub-micron sized spherical particles upon solvent exchange were studied using small angle X-ray scattering, dynamic light scattering and electron microscopy...
July 14, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28703643/methotrexate-and-beta-carotene-loaded-lipid-polymer-hybrid-nanoparticles-a-preclinical-study-for-breast-cancer
#15
Ashay Jain, Gajanand Sharma, Varun Kushwah, Neeraj K Garg, Prashant Kesharwani, Gargi Ghoshal, Bhupinder Singh, Uma Shankar Shivhare, Sanyog Jain, Om Prakash Katare
AIM: This work was intended to investigate the targeting potential of fructose-tethered lipid-polymeric hybrid nanoparticles (F-BC-MTX-LPHNPs) co-loaded with beta carotene (BC) and methotrexate (MTX) in breast cancer therapeutics and find out the possible protective role of BC on MTX-induced toxicity. MATERIALS & METHODS: F-BC-MTX-LPHNPs were fabricated using self-assembled nano-precipitation technique. Fructose was conjugated on the surface of the particles. The in vitro cytotoxicity, sub-cellular localization and apoptotic activity of F-BC-MTX-LPHNPs were evaluated against MCF-7 breast cancer cells...
July 13, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28702635/the-mechanism-of-nanoparticle-mediated-enhanced-energy-transfer-during-high-intensity-focused-ultrasound-sonication
#16
Chandan Bera, Surendra B Devarakonda, Vishal Kumar, Ashok K Ganguli, Rupak K Banerjee
In this combined experimental and theoretical research, magnetic nano-particle (mNP) mediated energy transfer due to high intensity-focused ultrasound (HIFU) sonication has been evaluated. HIFU sonications have been performed on phantoms containing three different volume percentages (0%, 0.0047%, and 0.047%) of mNPs embedded in a tissue mimicking material (TMM). A theoretical model has been developed to calculate the temperature rise in the phantoms during HIFU sonication. It is observed from theoretical calculation that the phonon layer at the interface of the mNPs and TMM dominates the attenuation for higher (0...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28702591/investigation-of-the-effects-of-phase-transformations-in-micro-and-nano-aluminum-powders-on-kinetics-of-oxidation-using-thermogravimetric-analysis
#17
Florin Saceleanu, Sanam Atashin, John Z Wen
Aluminum micro and nanoparticles are key ingredients in the synthesis of nano energetic materials. Hence it is important to characterize the kinetics and the rate controlling process of their oxidation. The literature shows that the mass diffusion and phase transformation within the aluminum oxide shell are important. However, the description of physical processes regarding simultaneous oxidation and phase transformation is lacking. In this paper, the controlled thermogravimetric (TGA) oxidation of 40-60 nm and 1 µm Al powders is investigated at constant heating rates and under isothermal conditions, respectively, upon varying the partial pressure of oxygen...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28701167/a-combined-experimental-and-numerical-study-on-upper-airway-dosimetry-of-inhaled-nanoparticles-from-an-electrical-discharge-machine-shop
#18
Lin Tian, Yidan Shang, Rui Chen, Ru Bai, Chunying Chen, Kiao Inthavong, Jiyuan Tu
BACKGROUNDS: Exposure to nanoparticles in the workplace is a health concern to occupational workers with increased risk of developing respiratory, cardiovascular, and neurological disorders. Based on animal inhalation study and human lung tumor risk extrapolation, current authoritative recommendations on exposure limits are either on total mass or number concentrations. Effects of particle size distribution and the implication to regional airway dosages are not elaborated. METHODS: Real time production of particle concentration and size distribution in the range from 5...
July 12, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28700211/polyphenolic-polymersomes-of-temperature-sensitive-poly-n-vinylcaprolactam-block-poly-n-vinylpyrrolidone-for-anticancer-therapy
#19
Veronika Kozlovskaya, Fei Liu, Bing Xue, Fahim Ahmad, Aaron Alford, Mohammad Saeed, Eugenia Kharlampieva
We report a versatile synthesis for polyphenolic polymersomes of controlled submicron (< 500 nm) size for intracellular delivery of high and low molecular weight compounds. The nanoparticles are synthesized by stabilizing the vesicular morphology of thermally responsive poly(N-vinylcaprolactam)n-poly(N-vinylpyrrolidone)m (PVCLn-PVPONm) diblock copolymers with tannic acid (TA), a hydrolyzable polyphenol, via hydrogen bonding at the temperature above the copolymer's LCST. The PVCL179-PVPONm diblock copolymers are produced by controlled RAFT polymerization of PVPON using PVCL as a macro-chain transfer agent...
July 12, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28699742/quantitative-analysis-of-reactive-oxygen-species-photo-generated-on-metal-oxide-nanoparticles-and-their-bacteria-toxicity-the-role-of-superoxide-radicals
#20
Dan Wang, Lixia Zhao, Haiyan Ma, Hui Zhang, Liang-Hong Guo
Ecotoxicity of engineered nanoparticles (NPs) have become the focus of considerable attention due to their wide applications. Reactive oxygen species (ROS) play important roles in the toxicity mechanisms of engineered metal-oxide NPs. This work aimed to understand quantitatively the contribution of photo-generated ROS on metal oxide NPs to their toxicity. The dynamic generation of O2•-, •OH and H2O2 in aqueous suspensions of photo-illuminated metal oxide nano- and bulk particles (TiO2, ZnO, V2O5, CeO2, Fe2O3, and Al2O3) was measured by a continuous-flow chemiluminescence (CFCL) detection system...
July 12, 2017: Environmental Science & Technology
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