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https://www.readbyqxmd.com/read/28821153/combination-of-microsized-mineral-particles-and-rosin-as-a-basis-for-converting-cellulosic-fibers-into-sticky-superhydrophobic-paper
#1
Xiaoyan Yu, Peiwen Bian, Yang Xue, Xueren Qian, Haipeng Yu, Wenshuai Chen, Xiaohai Hu, Peng Wang, Dong Wu, Qinghui Duan, Limei Li, Jing Shen, Yonghao Ni
The unique features of cellulosic paper including flexibility, biodegradability, and low cost enables it as a versatile, sustainable biomaterial for promising applications. In the paper industry, microsized mineral particles are widely used in the production of printing/writing paper grades, while rosin derived from trees is the earliest internal sizing agent for paper hydrophobication. On the basis of existing commercial practices associated with the use of mineral particles and rosin in paper production, we present a process concept of converting cellulosic fibers (paper-grade pulp) into "sticky" superhydrophobic paper involving the use of microsized mineral particles and rosin (a tree-derived natural product, mainly a mixture of resin acids, especially abietic acid with chemical formula of C19H29COOH)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821137/preparation-of-highly-oxidized-starch-using-hydrogen-peroxide-and-its-application-as-a-novel-ligand-for-zirconium-tanning-of-leather
#2
Yue Yu, Ya-Nan Wang, Wei Ding, Jianfei Zhou, Bi Shi
A series of highly-oxidized starch (HOS) were prepared using H2O2 and a copper-iron catalyst as a desired ligand for zirconium tanning of leather. The effects of catalyst and H2O2 dosages, and reaction temperature on the oxidation degree (OD, represented as the amount of carbonyl and carboxyl groups derived) of starch were investigated. The OD reached 76.2% when oxidation was conducted using 60% H2O2 and 0.015% catalyst at 98°C for 2h. (13)C NMR and FT-IR illustrated carbonyl and carboxyl groups were formed in HOS after oxidation...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820220/real-time-plasmon-spectroscopy-study-of-the-solid-state-oxidation-and-kirkendall-void-formation-in-copper-nanoparticles
#3
Mariano D Susman, Yishai Feldman, Tatyana A Bendikov, Alexander Vaskevich, Israel Rubinstein
Oxidation and corrosion reactions have a major effect on the application of non-noble metals. Kinetic information and simple theoretical models are often insufficient for describing such processes in metals at the nanoscale, particularly in cases involving formation of internal voids (nano Kirkendall effect, NKE) during oxidation. Here we study the kinetics of solid-state oxidation of chemically-grown copper nanoparticles (NPs) by in situ localized surface plasmon resonance (LSPR) spectroscopy during isothermal annealing in the range 110-170 °C...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819672/folding-sticky-elastica-dynamics-and-reversibility-of-folds-in-langmuir-monolayers
#4
L C Foucard, J M Eaton, M Dennin, Alex J Levine
Lipid monolayers at the air/water interface are often subject to large mechanical stresses when compressed laterally. For large enough compression they fold in the out-of-plane direction to relax stress. The repetitive folding and unfolding of lung surfactant monolayers during breathing plays a critical role in conserving monolayer material at the air/water interface lining the lung. Although the mechanisms behind the folding have been explored recently, relatively little information exists regarding the implications of folding dynamics on the long-term stability of the monolayer...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819664/antimicrobial-carbon-nanospheres
#5
Yao-Wen Jiang, Ge Gao, Xiaodong Zhang, Hao-Ran Jia, Fu-Gen Wu
Carbon nanomaterials have found numerous applications in various fields. However, their synthesis and functionalization usually require complicated procedures or tough experimental conditions. Herein, we report for the first time the synthesis of a new type of functional nanomaterial, quaternized carbon nanospheres (QCNSs), with superior antibacterial activity via a one-pot hydrothermal treatment of chitosan and hexadecylbetaine (abbreviated as BS-16). During the hydrothermal process, the direct reaction and carbonization between the amine-containing chitosan and the carboxyl-containing BS-16 were realized within only one step...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819659/solvent-hydrophobicity-induced-complex-coacervation-of-dsdna-and-in-situ-formed-zein-nanoparticles
#6
Pankaj Kumar Pandey, Priyanka Kaushik, Kamla Rawat, V K Aswal, H B Bohidar
Zein, a predominantly hydrophobic protein, was sustained as a stable dispersion in ethanol-water (80 : 20, % (v/v)) binary solvent at room temperature (25 °C). Addition of aqueous dsDNA solution (1% (w/v)) to the above dispersion prepared with the protein concentration of Czein = 0.01-0.5% (w/v) caused a concomitant change in ethanol content from 14-35% (v/v), which in turn generated zein nanoparticles in situ of size 80-120 nm increasing with water content. The subsequent associative interaction between DNA (polyanion; 2000 bps) and the positively charged zein nanoparticles, (at pH = 4) was driven by Coulombic forces, and by the solvent hydrophobicity due to the ethanol content of the binary solvent...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819178/curcumin-liposomes-interfere-with-quorum-sensing-system-of-aeromonas-sobria-and-in-silico-analysis
#7
Ting Ding, Tingting Li, Zhi Wang, Jianrong Li
Aeromonas sobria is opportunistic pathogen frequently found in environment and food. Interfering with its quorum sensing (QS) system could be a promising way to alleviate its virulence. In this study, curcumin liposomes were prepared and their characteristics like particle size, zeta potential, PDI (Polymey Disperse Index), encapsulation efficiency and loading capacity were measured. The quorum sensing inhibitory effect of curcumin liposomes under sub-MIC (Minimum Inhibitory Concentration) on siderophore production, swimming and swarming motility, extracellular proteases, biofilm formation and AHLs (N-acylhomoserine lactones) production of A...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819156/cell-damage-produced-by-magnetic-fluid-hyperthermia-on-microglial-bv2-cells
#8
M Pilar Calatayud, Elisa Soler, Teobaldo E Torres, Enrique Campos-Gonzalez, Concepción Junquera, M Ricardo Ibarra, Gerardo F Goya
We present evidence on the effects of exogenous heating by water bath (WB) and magnetic hyperthermia (MHT) on a glial micro-tumor phantom. To this, magnetic nanoparticles (MNPs) of 30-40 nm were designed to obtain particle sizes for maximum heating efficiency. The specific power absorption (SPA) values (f = 560 kHz, H = 23.9 kA/m) for as prepared colloids (533-605 W/g) dropped to 98-279 W/g in culture medium. The analysis of the intracellular MNPs distribution showed vesicle-trapped MNPs agglomerates spread along the cytoplasm, as well as large (~0...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819141/constructing-the-novel-ultrafine-amorphous-iron-oxyhydroxide-g-c3n4-nanosheets-heterojunctions-for-highly-improved-photocatalytic-performance
#9
Hongcen Yang, Shouwei Zhang, Ruya Cao, Xiaolong Deng, Zhipeng Li, Xijin Xu
Ultrafine particles, more heterojunction interfaces and amorphous materials can effectively enhance the photocatalytic activity of photocatalysts. In this work, a facile in-situ precipitation method was developed to prepare ultrafine amorphous iron oxyhydroxide/ultrathin g-C3N4 nanosheets heterojunction composites. The amorphous iron oxyhydroxide possessed an ultrafine particle size and a wide range of visible light absorption. In this process, the ultrafine particles not only shortened the diffusion distance of photogenerated carriers, but also facilitated the formation of more heterojunctions with ultrathin g-C3N4 nanosheets...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818776/bacillus-thuringiensis-coated-zinc-oxide-nanoparticle-and-its-biopesticidal-effects-on-the-pulse-beetle-callosobruchus-maculatus
#10
Balasubramanian Malaikozhundan, Baskaralingam Vaseeharan, Sekar Vijayakumar, Merlin P Thangaraj
Insect pests belonging to the genus Callosobruchus are the major cause of damage to stored pulse crops. Recently, nanotechnology has emerged as a promising tool for pest control. In the present study, we report for the first time the synthesis and biological evaluation of Bacillus thuringiensis coated zinc oxide nanoparticles (Bt-ZnO NPs) on the pulse beetle, Callosobruchus maculatus. The biologically synthesized Bt-ZnO NPs were extensively characterized using UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM) and Zeta potential...
August 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28815367/microplastic-pollution-a-threat-to-marine-ecosystem-and-human-health-a-short-review
#11
Shivika Sharma, Subhankar Chatterjee
Human populations are using oceans as their household dustbins, and microplastic is one of the components which are not only polluting shorelines but also freshwater bodies globally. Microplastics are generally referred to particles with a size lower than 5 mm. These microplastics are tiny plastic granules and used as scrubbers in cosmetics, hand cleansers, air-blasting. These contaminants are omnipresent within almost all marine environments at present. The durability of plastics makes it highly resistant to degradation and through indiscriminate disposal they enter in the aquatic environment...
August 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28815280/overcoming-challenges-in-single-particle-inductively-coupled-plasma-mass-spectrometry-measurement-of-silver-nanoparticles
#12
Jingyu Liu, Karen E Murphy, Michael R Winchester, Vincent A Hackley
Single particle ICP-MS has evolved rapidly as a quantitative method for determining nanoparticle size and number concentration at environmentally relevant exposure levels. Central to the application of spICP-MS is a commonly used, but not rigorously validated, calibration approach based on the measured transport efficiency and the response of ionic standards. In this work, we present a comprehensive and systematic study of the accuracy, precision and robustness of spICP-MS using the rigorously characterized reference material (RM) 8017 (Polyvinylpyrrolidone Coated Nominal 75 nm Silver Nanoparticles), recently issued by the National Institute of Standards and Technology (NIST)...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28814865/in-vitro-and-in-vivo-evaluation-of-sn-38-nanocrystals-with-different-particle-sizes
#13
Min Chen, Wanqing Li, Xun Zhang, Ye Dong, Yabing Hua, Hui Zhang, Jing Gao, Liang Zhao, Ying Li, Aiping Zheng
7-Ethyl-10-hydroxycamptothecin (SN-38) is a potent broad-spectrum antitumor drug derived from irinotecan hydrochloride (CPT-11). Due to its poor solubility and instability of the active lactone ring, its clinical use is significantly limited. As one of the most promising formulations for poorly water-soluble drugs, nanocrystals have attracted increasing attention. In order to solve these problems and evaluate the antitumor effect of SN-38 in vitro and in vivo, two nanocrystals with markedly different particle sizes were prepared...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28814864/controlled-release-of-lovastatin-from-poly-lactic-co-glycolic-acid-nanoparticles-for-direct-pulp-capping-in-rat-teeth
#14
Hung-Pin Lin, Han-Ping Tu, Yu-Ping Hsieh, Bor-Shiunn Lee
Statin at appropriate concentrations has been shown to induce odontoblastic differentiation, dentinogenesis, and angiogenesis. However, using a carrier to control statin release might reduce toxicity and enhance its therapeutic effects. The aim of this study was to prepare poly(d,l-lactide-co-glycolide acid) (PLGA) nanoparticles that contain lovastatin for application in direct pulp capping. The PLGA-lovastatin particle size was determined using dynamic light scattering measurements and transmission electron microscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28814229/cell-mediated-and-humoral-immune-responses-to-bordetella-pertussis-inactivated-whole-cells-encapsulated-alginate-microspheres-as-a-new-vaccine-candidate
#15
Naser Mohammadpour Dounighi, Fereshteh Shahcheraghi, Mehdi Razzaghi-Abyaneh, Mojtaba Nofeli, Hossein Zolfagharian
BACKGROUND: Effectiveness of the whole-cell pertussis vaccine is apparent, but improvement in the quality of the vaccine is necessary to achieve strong immunogenicity with a low bacterial number content. METHODS: The inactivated Bordetella pertussis (B. pertussis) cells entrapped microspheres were prepared via an emulsification method and analyzed for morphology, size, size distribution, loading efficiency, loading capacity, release kinetic, in vivo cytokines and antigen specific antibody subclasses...
August 15, 2017: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/28813621/improvement-of-an-in-vitro-model-to-assess-delivered-dose-and-particle-size-for-a-vibrating-mesh-nebulizer-during-mechanical-ventilation
#16
Nani Kadrichu, Derek Daniher
BACKGROUND: In an in vitro model of mechanical ventilation with gravity-dependent filter position we observed artificially high delivered doses resulting from liquid droplet collection and precipitation of aerosolized drug. We sequentially modified the model to obtain accurate reproducible measurements of delivered dose and particle size at endotracheal tube exit. METHODS: Stepwise changes in the model included (1) altering the endotracheal tube position to a gravity-independent position, (2) adding fluid traps, (3) humidifying air near the test lung, and (4) simplifying test lung and filters...
August 16, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/28813148/chitosan-coated-cinnamon-oregano-loaded-solid-lipid-nanoparticles-to-augment-5-fluorouracil-cytotoxicity-for-colorectal-cancer-extracts-standardization-nanoparticles-optimization-and-cytotoxicity-evaluation
#17
Kamel M Kamel, Islam A Khalil, Mostafa E Rateb, Hosieny Elgendy, Seham Elhawary
This study aimed to coat lipid-based-nanocarriers with chitosan to encapsulate nutraceuticals, minimize opsonization and facilitate passive-targeting. Phase-one was concerned with standardization according to WHO. Qualitative-analysis using LC-HRMS/MS investigated the active-constituents especially reported cytotoxic-agents. Cinnamaldehyde and rosmarinic acid was selected to be quantified using HPLC. Phase-two was aimed to encapsulate both extracts in solid lipid nanoparticles (core) and chitosan (shell) to gain the advantages of both materials properties...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28811202/aggregation-of-zein-in-aqueous-ethanol-dispersions-effect-on-cast-film-properties
#18
Lorina Bisharat, Alberto Berardi, Diego Romano Perinelli, Giulia Bonacucina, Luca Casettari, Marco Cespi, Hatim S AlKhatib, Giovanni F Palmieri
In this study, we evaluate the influence of zein aggregation in aqueous ethanol dispersions on the properties of zein films. The effects of zein concentration, ethanol content and temperature on transmittance of zein dispersions were investigated. Dynamic light scattering was used to measure the degree of zein aggregation in the dispersions. The results indicate that particle size of zein increased with higher zein concentration, lower ethanol level and at lower temperatures. Zein films were prepared by casting from 70% and 90% aqueous ethanol dispersions at different drying temperatures and were evaluated for appearance, thermomechanical and mechanical properties...
August 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28810687/the-characterization-of-polycyclic-aromatic-hydrocarbons-in-northeastern-us-trucking-terminals
#19
Erica D Walker, Jaime E Hart, Eric Garshick, Jennifer M Cavallari, Mary E Davis, Thomas J Smith, Francine Laden
In recent years, significant attention has been given to polycyclic aromatic hydrocarbons (PAHs) exposures given their mutagenic and carcinogenic properties. However, levels of exposure and the key determinants of exposure are not well defined for the trucking industry. We measured ultrafine particle characteristics at 10 trucking terminals of varying operating size and location in the Northeast region of the United States using particle concentration counter and a surface area analyzer. Multivariate mixed-effects linear regression models were used to assess determinants of the concentration of total bound PAHs (tPAH), the total aerosol active surface area (AS), and the ratio tPAH/AS overall and individually within docks, trucking cabs, and administrative offices...
August 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28810122/crystal-face-distributions-and-surface-site-densities-of-two-synthetic-goethites-implications-for-adsorption-capacities-as-a-function-of-particle-size
#20
Kenneth J T Livi, Mario Villalobos, Rowan K Leary, Maria Varela, Jon Barnard, Milton Villacís-García, Rodolfo Zanella, Anna Goodridge, Paul A Midgley
Two synthetic goethites of varying crystal sizes distributions were analyzed by BET, conventional TEM, cryo-TEM, atomic resolution STEM and HRTEM, and electron tomography in order to determine the effects of crystal size, shape, and atomic scale surface roughness on their adsorption capacities. The two samples were determined by BET to have very different site densities based on CrVI adsorption experiments. Model specific surfaces areas generated from TEM observations showed that, based on size and shape, there should be little difference in their adsorption capacities...
August 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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