keyword
MENU ▼
Read by QxMD icon Read
search

Porous

keyword
https://www.readbyqxmd.com/read/28641182/unraveling-the-complexities-of-the-velocity-dependency-of-e-coli-retention-and-release-parameters-in-saturated-porous-media
#1
Salini Sasidharan, Scott A Bradford, Saeed Torkzaban, Xueyan Ye, Joanne Vanderzalm, Xinqiang Du, Declan Page
Escherichia coli transport and release experiments were conducted to investigate the pore-water velocity (v) dependency of the sticking efficiency (α), the fraction of the solid surface area that contributed to retention (Sf), the percentage of injected cells that were irreversibly retained (Mirr), and cell release under different (10-300mM) ionic strength (IS) conditions. Values of α, Sf, and Mirr increased with increasing IS and decreasing v, but the dependency on v was greatest at intermediate IS (30 and 50mM)...
June 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28641089/combined-time-lapse-magnetic-resonance-imaging-and-modeling-to-investigate-colloid-deposition-and-transport-in-porous-media
#2
Alizée P Lehoux, Pamela Faure, François Lafolie, Stéphane Rodts, Denis Courtier-Murias, Philippe Coussot, Eric Michel
Colloidal particles can act as vectors of adsorbed pollutants in the subsurface, or be themselves pollutants. They can reach the aquifer and impair groundwater quality. The mechanisms of colloid transport and deposition are often studied in columns filled with saturated porous media. Time-lapse profiles of colloid concentration inside the columns have occasionally been derived from magnetic resonance imaging (MRI) data recorded in transport experiments. These profiles are valuable, in addition to particle breakthrough curves (BTCs), for testing and improving colloid transport models...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28640590/chlorin-e6-functionalized-theranostic-multistage-nanovectors-transported-by-stem-cells-for-effective-photodynamic-therapy
#3
Simo Näkki, Jonathan Martinez, Michael Evangelopoulos, Wujun Xu, Vesa-Pekka Lehto, Ennio Tasciotti
Approaches to achieve site-specific and targeted delivery that provide an effective solution to reduce negative, off target side-effects are urgently needed for cancer therapy. Here, we utilized a Trojan horse-like strategy to carry photosensitizer Chlorin e6 conjugated porous silicon multistage nanovectors with tumor homing mesenchymal stem cells for targeted photodynamic therapy and diagnosis. The inherent versatility of multistage nanovectors permitted the conjugation of photosensitizers to enable precise cell death induction (60%) upon photodynamic therapy, while simultaneously retaining the loading capacity to load various payloads, such as antitumor drugs and diagnostic nanoparticles...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636565/porous-carbon-nanotubes-decorated-carbon-nanofibers-with-effective-microwave-absorption-property
#4
Tao Zhang, Bo Xiao, Pengyu Zhou, Long Xia, Guangwu Wen, Haibin Zhang
Carbon nanofibers decorated with porous carbon nanotubes have been prepared by electrospinning and annealing methods. Microwave reflection loss of the products is investigated in the frequency range of 2-18 GHz. The bandwidth with a reflection loss less than -10 dB covers a wide frequency ranging from 7.0 to 14.1 GHz with the thickness of 3.0-5.5 mm, and the minimum reflection loss is -44.5 dB at 10.7 GHz with a thickness of 2.0 mm. The large reflection loss and wide reflection band reveals that the products could be a promising candidate for microwave absorption...
June 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28636384/role-of-crystal-structure-and-chalcogenide-redox-properties-on-the-oxidative-assembly-of-cadmium-chalcogenide-nanocrystals
#5
Jessica Davis, Aaron M Chalifoux, Stephanie L Brock
Oxidative assembly of metal chalcogenide nanocrystals (NCs) enables formation of 2-D (dense) and 3-D porous structures without the presence of intervening ligands between particles that can moderate transport properties. This route has been demonstrated successful for a range of single component structures including CdQ, PbQ and ZnQ (Q = S, Se, Te). En route to controllable assembly of multicomponent nanostructures, the roles of Q redox properties (2Q2-  Q22- + 2e), responsible for particle crosslinking, and the native structure (cubic zinc blende vs...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28636356/biomimetic-architectured-graphene-aerogel-with-exceptional-strength-and-resilience
#6
Miao Yang, Nifang Zhao, Ying Cui, Weiwei Gao, Qian Zhao, Chao Gao, Hao Bai, Tao Xie
Materials combining lightweight, robust mechanical performances, and multifunctionality are highly desirable for engineering applications. Graphene aerogels have emerged as attractive candidates. Despite recent progresses, the bottleneck remains how to simultaneously achieve both strength and resilience. While multiscale architecture designs may offer a possible route, the difficulty lies in the lack of design guidelines and how to experimentally achieve the necessary structure control over multiple length scales...
June 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28636318/inverse-photonic-glasses-by-packing-bi-disperse-hollow-microspheres-with-uniform-cores
#7
Seung-Hyun Kim, Sofia Magkiriadou, Do Kyung Rhee, Doo Sung Lee, Pil J Yoo, Vinothan N Manoharan, Gi-Ra Yi
A major fabrication challenge is producing disordered photonic materials with angle-independent structural red color. Theoretical work has shown that such color can be produced by fabricating inverse photonic glasses with monodisperse, non-touching voids in a silica matrix. Here we demonstrate a route toward such materials and show that they have angle-independent red color. We first synthesize monodisperse hollow silica particles with precisely controlled shell thickness, then make glassy colloidal structures by mixing two types of hollow particles with the same core size and different shell thicknesses...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636315/fabrication-of-hierarchical-macroporous-biocompatible-scaffolds-by-combining-pickering-high-internal-phase-emulsion-templates-with-three-dimensional-printing
#8
Ting Yang, Yang Hu, Chaoyang Wang, Bernard P Binks
Biocompatible and biodegradable porous scaffolds with adjustable pore structure have aroused increasing interest in bone tissue engineering. Here, we report a facile method to fabricate hierarchical macroporous biocompatible (HmPB) scaffolds by combining Pickering high internal phase emulsion (HIPE) templates with three-dimensional (3D) printing. HmPB scaffolds composed of a polymer matrix of poly(L-lactic acid), PLLA, and poly(ε-caprolactone), PCL, are readily fabricated by solvent evaporation of 3D printed Pickering HIPEs which are stabilized by hydrophobically modified silica nanoparticles (h-SiO2)...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636308/redox-sensitive-nanoscale-coordination-polymers-for-drug-delivery-and-cancer-theranostics
#9
Jiayue Zhao, Yu Yang, Xiao Han, Chao Liang, Jingjing Liu, Xuejiao Song, Zili Ge, Zhuang Liu
Nanoscale coordination polymers (NCPs) with inherent biodegradability, chemical diversities, and porous structures, are a promising class of nanomaterials in the nanomedicine field. Herein, a unique type of redox sensitive NCPs is constructed with manganese ions (Mn2+) and dithiodiglycolic acid as the disulfide (SS) containing organic bridging ligand. The obtained Mn-SS NCPs with mesoporous structure could be efficiently loaded with doxorubicin (DOX), a chemotherapeutics. The yielded Mn-SS/DOX nanoparticles are coated with a layer of polydopamine (PDA) and then modified by polyethylene glycol (PEG)...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636029/cross-impact-of-surface-and-interaction-anisotropy-in-the-self-assembly-of-organic-adsorption-monolayers-a-monte-carlo-and-transfer-matrix-study
#10
V A Gorbunov, S S Akimenko, A V Myshlyavtsev
Using a simple lattice gas model we study the features of self-assembly in adsorption layers where both "molecule-surface" and "molecule-molecule" interactions are anisotropic. Based on the example of adsorption layers of mono-functional organic molecules on the heterogeneous surface with strip-like topography, we have revealed plenty of possible self-assembled structures in this simple system, such as discrete, linear, zigzag, chess board-like, two-dimensional porous and close-packed patterns. However, the phase behavior of the adsorption layer is much richer, if the interactions between functional and non-functional parts of adjacent adsorbed molecules have comparable strength and opposite signs...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28635641/the-fate-of-pollutants-in-porous-asphalt-pavements-laboratory-experiments-to-investigate-their-potential-to-impact-environmental-health
#11
Susanne M Charlesworth, Jamie Beddow, Ernest O Nnadi
Pervious Paving Systems (PPS) are part of a sustainable approach to drainage in which excess surface water is encouraged to infiltrate through their structure, during which potentially toxic elements, such as metals and hydrocarbons are treated by biodegradation and physical entrapment and storage. However, it is not known where in the PPS structure these contaminants accumulate, which has implications for environmental health, particularly during maintenance, as well as consequences for the recycling of material from the PPS at the end-of-life...
June 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28635414/core-shell-pla-pva-porous-microparticles-as-carriers-for-bacteriocin-nisin
#12
Pavlina Holcapkova, Martina Hrabalikova, Petra Stoplova, Vladimir Sedlarik
This work is focused on preparation of novel porous type of core-shell-structured microparticles based on polylactide (shell) and poly(vinyl alcohol) cross-linked with glutaric acid (GA) (core) prepared by water-in-oil-in-water solvent evaporation technique. The microparticle systems were used as delivery systems for immobilisation of model antibacterial agent - nisin. The effect of cross-linking and the initial amount of nisin on their morphology was investigated using scanning electron microscopy, BET analysis, zeta potential measurement and Fourier transform infra-red spectroscopy...
June 21, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28635250/a-highly-stimuli-responsive-au-nanorods-poly-n-isopropylacrylamide-pnipam-composite-hydrogel-for-smart-switch
#13
Chuan-Ling Zhang, Fu-Hu Cao, Jin-Long Wang, Zhi-Long Yu, Jin Ge, Yang Lu, Zhi-Hua Wang, Shu-Hong Yu
To achieve both fast response and structural integrity during the repeating volume changes are the most significant chal-lenges for thermo-responsive hydrogels. In this work, AuNRs/PNIPAM composite hydrogel with fast thermal/optical re-sponse and structural integrity is facilely prepared by electrospinning and following a curing treatment. By combining the photothermal property of AuNRs and thermal-responsive effect of PNIPAM, the composite hydrogel shows fast thermal/photo-response, high heating rate and high structural integrity with fiercely size change...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28634793/arsenic-sorption-by-red-mud-modified-biochar-produced-from-rice-straw
#14
Chuan Wu, Liu Huang, Sheng-Guo Xue, Yu-Ying Huang, William Hartley, Meng-Qian Cui, Ming-Hung Wong
Red mud-modified biochar (RM-BC) has been produced to be utilized as a novel adsorbent to remove As because it can effectively combine the beneficial features of red mud (rich metal oxide composition and porous structure) and biochar (large surface area and porous structure properties). SEM-EDS and XRD analyses demonstrated that red mud had loaded successfully on the surface of biochar. With the increasing of pH in solution, arsenate (As(V)) adsorption on RM-BC decreased while arsenite (As(III)) increased. Arsenate adsorption kinetics process on RM-BC fitted the pseudo-second-order model, while that of As(III) favored the Elovich model...
June 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634610/efficiently-mapping-structure-property-relationships-of-gas-adsorption-in-porous-materials-application-to-xe-adsorption
#15
A R Kaija, C E Wilmer
Designing better porous materials for gas storage or separations applications frequently leverages known structure-property relationships. Reliable structure-property relationships, however, only reveal themselves when adsorption data on many porous materials are aggregated and compared. Gathering enough data experimentally is prohibitively time consuming, and even approaches based on large-scale computer simulations face challenges. Brute force computational screening approaches that do not efficiently sample the space of porous materials may be ineffective when the number of possible materials is too large...
June 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28634602/recent-advances-in-the-computational-chemistry-of-soft-porous-crystals
#16
Guillaume Fraux, François-Xavier Coudert
Here we highlight recent progress in the field of computational chemistry of nanoporous materials, focusing on methods and studies that address the extraordinary dynamic nature of these systems: the high flexibility of their frameworks, the large-scale structural changes upon external physical or chemical stimulation, and the presence of defects and disorder. The wide variety of behavior demonstrated in soft porous crystals, including the topical class of metal-organic frameworks, opens new challenges for computational chemistry methods at all scales...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634397/one-pot-hydrothermal-synthesis-of-cds-decorated-cus-microflower-like-structures-for-enhanced-photocatalytic-properties
#17
Xiaolong Deng, Chenggang Wang, Hongcen Yang, Minghui Shao, Shouwei Zhang, Xiao Wang, Meng Ding, Jinzhao Huang, Xijin Xu
CdS decorated CuS structures have been controllably synthesized through a one-pot hydrothermal method. The morphologies and compositions of the as-prepared samples could be concurrently well controlled by simply tuning the amount of CdCl2 and thiourea. Using this strategy, the morphology of the products experienced from messy to flower-like morphologies with multiple porous densities, together with the phase evolution from pure CuS to the CdS/CuS composites. Serving as a photocatalyst, the samples synthesized with the addition of 1 mmol cadmium chloride and 3 mmol thiourea during synthetic process, showed the best photocatalytic activity, which could reach a maximum photocatalytic efficiency of 93% for methyl orange (MO) photodegradation after 150 min...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634126/biosorption-of-high-concentration-cu-ii-by-periphytic-biofilms-and-the-development-of-a-fiber-periphyton-bioreactor-fpbr
#18
Junzhuo Liu, Fengwu Wang, Wantong Wu, Juanjuan Wan, Jiali Yang, Sulin Xiang, Yonghong Wu
In this study, a kind of microbial aggregates: periphytic biofilms were used for Cu removal and immobilized onto fiber for developing a novel bioreactor. Results show that periphyton can effectively entrap Cu at initial concentrations of 2-20mgL(-1) due to the overproduction of EPS and porous structure of periphyton, and biosorption was the primary mechanism of Cu removal. Cu (mainly Cu3(OH)4(2+), Cu2(OH)2(2+) and Cu(2+)) adsorption onto periphytic biofilms followed the pseudo-second order kinetic model. The biosorption process fitted the Freundlich, Langmuir and Dubinin-Radushkevich Isotherm models well and was thermodynamically spontaneous...
June 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28633839/permeability-recovery-of-damaged-water-sensitive-core-using-ultrasonic-waves
#19
Nasir Khan, Chunsheng Pu, Xu Li, Yanlong He, Lei Zhang, Cheng Jing
It is imperative to recover the well productivity lose due to formation damage nearby wellbore during variant well operations. Some indispensable issues in conventional techniques make ultrasonic technology more attractive due to simple, reliable, favorable, cost-effective, and environment friendly nature. This study proposes the independent and combined use of ultrasonic waves and chemical agents for the treatment of already damaged core samples caused by exposure to distilled water. Results elucidate that ultrasonic waves with optimum (20kHz, 1000W) instead of maximum frequency and power worked well in the recovery owing to peristaltic transport caused by matching of natural frequency with acoustic waves frequency...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633566/microsphere-based-scaffolds-in-regenerative-engineering
#20
Vineet Gupta, Yusuf Khan, Cory J Berkland, Cato T Laurencin, Michael S Detamore
Microspheres have long been used in drug delivery applications because of their controlled release capabilities. They have increasingly served as the fundamental building block for fabricating scaffolds for regenerative engineering because of their ability to provide a porous network, offer high-resolution control over spatial organization, and deliver growth factors/drugs and/or nanophase materials. Because they provide physicochemical gradients via spatiotemporal release of bioactive factors and nanophase ceramics, microspheres are a desirable tool for engineering complex tissues and biological interfaces...
June 21, 2017: Annual Review of Biomedical Engineering
keyword
keyword
6142
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"