The flow of water confined in nanosize capillaries is subject of intense research due to its relevance in the fabrication of nanofluidic devices and in the development of theories for fluid transport in porous media. Here, using molecular dynamics simulations carried out on 2D capillaries made up of graphite, hexagonal boron nitride (hBN) and a mix of the two, and of sizes from subnanometer to few nanometers, we investigate the relationship between the wettability of the wall capillary, the water diffusion, and its flow rate. We find that the water diffusion is decoupled from its flow properties as the former is not affected either by the height or chemistry of the capillary (except for the subnanometer slits), while the latter is dependent on both. The capillaries containing hBN show a reduced flow rate compared to those that are purely graphitic, likely due to the high friction coefficient between water and hBN. Such resistance to the flow is, however, at its maximum in the smallest capillary and lower for larger ones. Finally, we show that the flow rate values obtained from the Hagen-Poiseuille theory are almost always smaller than those obtained from simulations, indicating that either the slip length or the viscosity of nanoconfined water could be substantially different from the bulk values.
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http://dx.doi.org/10.1021/acsami.4c10738 | DOI Listing |
J Infus Nurs
December 2024
Author Affiliations: Elaine Marieb College of Nursing, Elaine Marieb Center for Nursing & Engineering Innovation, University of Massachusetts Amherst, Amherst, Massachusetts.
Intravenous pumps (IVPs) deliver IV medications to millions of acute care patients each year and result in many adverse events reported to the US Food and Drug Administration (FDA). Although the use of IVPs has improved overall safety, there are still high rates of error that risk the safety of all patients, especially those of advanced age and those suffering from critical illness. Most of the documented errors are based on clinician reports, although there is reason to believe that errors due to flow rate inaccuracy go undetected and unreported.
View Article and Find Full Text PDFCell Biochem Biophys
January 2025
Pharmacy Administration Office, The Third Hospital of Nanchang City, Jiangxi Province, Nanchang, Jiangxi, China.
In the contemporary era of drug discovery, herbal treatments have demonstrated an unparalleled ability to produce anticancer drugs. An important part of the therapy of cancer is the use of plants and their by-products via analogues, which alter the tumor microenvironment and several signaling pathways. The objective of the current investigation was to conclude the rate at which the herbal medications quercetin (QT) and sulforaphane (SFN) repressed the growth of breast carcinoma cells in MDA-MB-231 by preventing the ERK/MAPK signaling systems.
View Article and Find Full Text PDFInvest Ophthalmol Vis Sci
January 2025
Department of Ophthalmology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Purpose: A projection-resolved optical coherence tomography angiography (PR-OCTA) algorithm with slab-specific strategy was applied in polypoidal choroidal vasculopathy (PCV) to differentiate between polyp and branching vascular network (BVN) and improve polyp detection by en face OCTA.
Methods: Twenty-nine participants diagnosed with PCV by indocyanine green angiography (ICGA) and 30 participants diagnosed with typical neovascular age-related macular degeneration (nAMD) were enrolled. Polyps were classified into three categories after using the slab-specific PR algorithm.
Andes Pediatr
August 2024
Facultad de Salud, Universidad Santiago de Cali, Cali, Colombia.
Unlabelled: High-frequency oscillatory ventilation with volume guarantee (HFOV-VG) is a ventilatory mode that controls small tidal volumes at supraphysiological frequencies, potentially beneficial for preterm infants with respiratory distress syndrome (RDS).
Objective: To identify the physiological and clinical effects of HFOV-VG in preterm newborns with RDS, compared with conventional HFOV.
Method: Exploratory review of studies published between 2019 and 2023 of preterm newborns from 23 to 36 weeks of gestation with RDS, weighing ≥ 450g, with invasive HFOV support, using PRISMA flow diagram.
Head Neck
January 2025
Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
Background: Flow-through flaps (FTFs) are an advanced technique in which a free flap is anastomosed to the pedicle of another free flap to reconstruct extensive head and neck defects when recipient vessels are scarce.
Methods: A multi-institutional cohort of FTFs used for head and neck reconstruction were reviewed. For comparison, FTF outcomes were compared to free flaps that required vein grafts (VG) to reach distant recipient vessels.
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