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Search for "membranes" in Full Text gives 304 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Intermodal coupling spectroscopy of mechanical modes in microcantilevers
Beilstein J. Nanotechnol. 2023, 14, 123–132, doi:10.3762/bjnano.14.13
- coupling was proven in doubly clamped beams, square membranes and circular membranes [18][26][27][28][29][30][31]. For atomic force microscopy imaging, a slight angle between the sensing mechanical resonator and the sample of interest is required, ensuring that the only contact occurs between the sample
Frequency-dependent nanomechanical profiling for medical diagnosis
Beilstein J. Nanotechnol. 2022, 13, 1483–1489, doi:10.3762/bjnano.13.122
- optical imaging, the device could be equipped with one or more piezoelectrically excited membranes coupled with a sensing mechanism, such as an AFM cantilever or other type of mechanical sensor (similar stand-alone developments already exist [31][32]). The mechanical response of the membrane could be
Straight roads into nowhere – obvious and not-so-obvious biological models for ferrophobic surfaces
Beilstein J. Nanotechnol. 2022, 13, 1345–1360, doi:10.3762/bjnano.13.111
- segmentation of the water conduit network into compartments. Each pit pore connects two conduits, and this joint pore space is separated by a special nanoporous membrane, the pit membrane (Figure 4). When a conduit becomes dysfunctional due to embolism, the nanopores within the pit membranes prevent the
Roll-to-roll fabrication of superhydrophobic pads covered with nanofur for the efficient clean-up of oil spills
Beilstein J. Nanotechnol. 2022, 13, 1228–1239, doi:10.3762/bjnano.13.102
- , mixtures of oil (nonpolar) and water (polar) are easily separated. A promising application of nanofur is therefore the cleaning of oil spills [23][31]. This behavior can be also utilized for the fabrication of membranes that filter oil out of water (or vice versa) [17]. For that, the nanofur is perforated
Design of surface nanostructures for chirality sensing based on quartz crystal microbalance
Beilstein J. Nanotechnol. 2022, 13, 1201–1219, doi:10.3762/bjnano.13.100
- recognition of biomolecules (Figure 2) [38]. The sensing films of poly(EDOT-OH) with either R or S chirality were directly synthesized on the surface of the QCM electrode and engineered with different morphologies of nanotubular arrays and smooth membranes. The binding effects of fetal bovine serum, RGD
- -alanine was 307.97% more enantioselective than ᴅ-alanine. Similar enantioselectivity could also be achieved by Al/ʟ-Cys MLD films [123]. The methodology is also versatile and promising for the deposition of chiral thin films over any substrates or membranes of interest, which may promote the exploration
- oligomers, and the subsequent fibrillation process. The results give interesting insights into the crucial roles of biological membranes on protein amyloidosis, and how intrinsic chirality contributes to this process. It also brings the prospect of chiral-modified carbon nanostructures for biological and
Application of nanoarchitectonics in moist-electric generation
Beilstein J. Nanotechnol. 2022, 13, 1185–1200, doi:10.3762/bjnano.13.99
- liquids, the selection of ion-permeable membranes, and the effects of surface functional groups are discussed in detail in the paper and will not be repeated here. By adding an ion-selective membrane, ion concentration diffusion can take place in the fluid, not just in the bulk material. This innovation
Green synthesis of zinc oxide nanoparticles toward highly efficient photocatalysis and antibacterial application
Beilstein J. Nanotechnol. 2022, 13, 1108–1119, doi:10.3762/bjnano.13.94
- , •O2−, O2 formed on the surface of ZnO NPs, will break bacterial cell membranes and enter the cells destroying organelles and ultimately inhibiting and shutting off bacteria metabolism [37][38]. The •OH radical is the most active oxidant which rapidly reacts with bacterial nucleic acids, lipids
- bacterial cell membranes, inhibiting amino acid metabolism and disrupting the bacterial cell enzymatic system [43][44][45]. Conclusion ZnO nanoparticles were synthesized by a green method using rosin extracted from Pinus latteri trees in Vietnam. The XRD diagram of synthesized ZnO showed that ZnO has the
Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications
Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93
- by the use of vacuum filtration to separate the hydrothermal product. The hydrochar was refluxed in nitric and sulfuric acid, and dialysis membranes of different sizes were used to get CDs emitting four different colors, that is, blue, green, yellow, and red (Figure 7A,B) [118]. EDTA was used in a
Biomimetic chitosan with biocomposite nanomaterials for bone tissue repair and regeneration
Beilstein J. Nanotechnol. 2022, 13, 1051–1067, doi:10.3762/bjnano.13.92
- Chemical Society. This content is not subject to CC BY 4.0. (a) The viability of mesenchymal stem cells in the developed electrospun membranes Live (green) and dead (red) staining of cells after 24 h of incubation. (b) Chitosan-based nanofibers without the addition of graphene oxide or (c) containing 1 wt
- % of graphene oxide. SEM images show the geometry of MSCs on the surface of membranes containing (d) 0% of graphene oxide, (e) 0.5% graphene oxide, (f) 1, (g) 1.5, and (h) 2% of graphene oxide. Figure 6 was reprinted from [72], Materials Science and Engineering: C, vol. 70, by N. Mahmoudi; A. Simchi
- , “On the biological performance of graphene oxide-modified chitosan/polyvinyl pyrrolidone nanocomposite membranes: In vitro and in vivo effects of graphene oxide”, pages 121–131, Copyright (2016), with permission from Elsevier. This content is not subject to CC BY 4.0. Alkaline phosphatase activity in
Bioselectivity of silk protein-based materials and their bio-inspired applications
Beilstein J. Nanotechnol. 2022, 13, 902–921, doi:10.3762/bjnano.13.81
- and promotes their attachment to the bacterial surface/membrane residues [85]. HDPs have properties of cell-penetrating peptides and can translocate across membranes of prokaryotic, but also eukaryotic, cells [90]. The main mode of action of these peptides is promotion of adhesion through the cationic
- groups to the anionic bacterial membranes and their lipopolysaccharides (a component of the outer membrane of most Gram-negative bacteria), enabling insertion into the membrane driven by clusters of hydrophobic residues [85][91]. As a consequence, the microbial membranes are permeabilized, associated
- be used to generate self-assembled membranes, allowing for the adhesion of endothelial cells on the one side and smooth muscle cells on the other side, as well as the diffusion of relevant molecules, making this material promising for vascular tissue engineering [170]. In addition to flat films or
Effects of substrate stiffness on the viscoelasticity and migration of prostate cancer cells examined by atomic force microscopy
Beilstein J. Nanotechnol. 2022, 13, 560–569, doi:10.3762/bjnano.13.47
- for cell invasion [25][26]. Our results suggest that stiff substrates promote the protrusion of the leading edge of cancer cell membranes to guide cell motility. The average surface roughness of cells on extracellular environments with different stiffness is shown in Figure 3d. PC-3 cells showed a
Ethosomal (−)-epigallocatechin-3-gallate as a novel approach to enhance antioxidant, anti-collagenase and anti-elastase effects
Beilstein J. Nanotechnol. 2022, 13, 491–502, doi:10.3762/bjnano.13.41
- their interaction with skin cells is high. They are unique systems that can be easily shaped by the presence of ethanol in their structures, and their vesicle membranes become very flexible such that they can be transported through pores much smaller than their own diameters [20][21]. In addition, the
- liposomes, which have limited skin penetration and mostly remain in the upper layer of the stratum corneum. The release of the therapeutic agent occurs by the fusion of these vesicles with the cell membranes in the deeper layers of the skin [11]. ETHs have been reported to help many active substances to be
Investigation of electron-induced cross-linking of self-assembled monolayers by scanning tunneling microscopy
Beilstein J. Nanotechnol. 2022, 13, 462–471, doi:10.3762/bjnano.13.39
- Abstract Ultrathin membranes with subnanometer pores enabling molecular size-selective separation were generated on surfaces via electron-induced cross-linking of self-assembled monolayers (SAMs). The evolution of p-terphenylthiol (TPT) SAMs on Au(111) surfaces into cross-linked monolayers was observed
The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks
Beilstein J. Nanotechnol. 2022, 13, 437–443, doi:10.3762/bjnano.13.36
- these, proton-conducting solid materials show significant potential in the development of novel membranes for proton exchange membrane (PEM) fuel cells, PEM electrolyzers, and for humidity sensors [5][6][7]. The goal is to overcome the restrictions of state-of-the-art proton-conducting membrane
Effect of sample treatment on the elastic modulus of locust cuticle obtained by nanoindentation
Beilstein J. Nanotechnol. 2022, 13, 404–410, doi:10.3762/bjnano.13.33
- expect this difference is due to the influence of hydrated soft tissues (e.g., membranes and muscles) that are attached to the interior wall of the tibial cuticle. In our study, we carefully removed the inner tissues, whereas the previous studies have been performed on the whole tibia. Conclusion The
Electrostatic pull-in application in flexible devices: A review
Beilstein J. Nanotechnol. 2022, 13, 390–403, doi:10.3762/bjnano.13.32
- small voltage and controlling the airflow between the two cavities. The system can also be used for molecular sieving of gases and the aspiration and dispensing of liquids by introducing pores in the graphene membranes. NEM physical unclonable functions Just as NEM switches use the pull-in instability
Micro- and nanotechnology in biomedical engineering for cartilage tissue regeneration in osteoarthritis
Beilstein J. Nanotechnol. 2022, 13, 363–389, doi:10.3762/bjnano.13.31
- , interesting and innovative nanofiber-based scaffolds have been developed using electrospinning methods in which the concentration distributions of two bioactive agents were applied [117] or a range of membranes with different proportions of components were prepared to mimic the zonal matrix of the bone
Interfacial nanoarchitectonics for ZIF-8 membranes with enhanced gas separation
Beilstein J. Nanotechnol. 2022, 13, 313–324, doi:10.3762/bjnano.13.26
- Road, Taipei 10617, Taiwan Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University P.O.Box 84428. Riyadh 116711, Saudi Arabia 10.3762/bjnano.13.26 Abstract Metal-organic framework (MOF) membranes are potentially useful in gas separation applications. Conventional
- methods of MOF membrane preparation require multiple steps and high-pressure conditions. In this study, a reliable one-step interfacial synthesis method under atmospheric pressure has been developed to prepare zeolitic imidazolate framework-8 (ZIF-8) membranes supported on porous α-Al2O3 disks. To obtain
- optimal ZIF-8 membranes, three reaction parameters were investigated, namely, reaction temperature, reaction time, and concentration of the organic linker (i.e., 2-methylimidazole). The growth of ZIF-8 membranes under various parameters was evaluated by field-emission scanning electron microscopy, and the
Photothermal ablation of murine melanomas by Fe3O4 nanoparticle clusters
Beilstein J. Nanotechnol. 2022, 13, 255–264, doi:10.3762/bjnano.13.20
- proteins were resolved by SDS-PAGE, transferred to nitrocellulose membranes and blocked with 5% non-fat milk for 1 h at room temperature. After overnight incubation with anti-HSP70 primary antibody (Cell Signaling Technologies, #4872) or anti-ACTB (Cell Signaling Technologies, #4970) at 4 °C, membranes
- were washed with 1× TBST for three times and incubated for 1 h at room temperature with HRP-conjugated Goat anti-Rabbit secondary antibody (Thermo Scientific). Membranes were washed three times with 1× TBST and rinsed in H2O2/DAB substrate mixture until the reaction proceeded to the desired intensity
- . Finally, membranes were washed in water, dried and photographed by ChemiDoc™ MP Imaging System (Bio-Rad). Densitometric quantification analysis was performed using the built-in Image Lab software. Relative expression levels were presented as ratios of band intensities of HSP70 over the internal control
A comprehensive review on electrospun nanohybrid membranes for wastewater treatment
Beilstein J. Nanotechnol. 2022, 13, 137–159, doi:10.3762/bjnano.13.10
- for Advanced Materials Research (CAMR), Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka 10.3762/bjnano.13.10 Abstract Electrospinning, being a versatile and straightforward method to produce nanofiber membranes, has shown significant advancement in
- recent years. On account of the unique properties such as high surface area, high porosity, mechanical strength, and controllable surface morphologies, electrospun nanofiber membranes have been found to have a great potential in many disciplines. Pure electrospun fiber mats modified with different
- techniques of surface modification and additive incorporation have exhibited enhanced properties compared to traditional membranes and are even better than the as-prepared electrospun membranes. In this review, we have summarized recently developed electrospun nanohybrids fabricated by the incorporation of
Tin dioxide nanomaterial-based photocatalysts for nitrogen oxide oxidation: a review
Beilstein J. Nanotechnol. 2022, 13, 96–113, doi:10.3762/bjnano.13.7
- thin film materials that can replace powder materials, (5) adhering the catalyst materials on commercial films such as polypropylene, polytetrafluorethylene, or PM2.5 films for real-life applications, such as air filters and NOx gas treatment membranes; and (6) applying the materials in biological
Theranostic potential of self-luminescent branched polyethyleneimine-coated superparamagnetic iron oxide nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 82–95, doi:10.3762/bjnano.13.6
- pathways do not necessarily involve traffic to lysosomes, it can yield a better transfection efficiency [65]. Indeed, it was shown that both unmodified branched and linear PEI polyplexes could damage plasma membranes, resulting in a rapid redistribution of phosphatidylserine from the inner plasma membrane
Measurement of polarization effects in dual-phase ceria-based oxygen permeation membranes using Kelvin probe force microscopy
Beilstein J. Nanotechnol. 2021, 12, 1380–1391, doi:10.3762/bjnano.12.102
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Wilhelm-Johnen-Straße, 52452 Jülich, Germany Faculty of Science and Technology, Inorganic Membranes, University of Twente, 7500 AE Enschede, Netherlands Central Facility for Electron Microscopy GFE
- spinel or perovskite phase applicable in membrane reactors for partial oxidation reactions. Dual-phase membranes with FeCo2O4, or its iron-rich pendant Fe2CoO4, and Gd-doped ceria as an ion conductor have already been successfully applied as oxygen permeation membranes with high permeability in the
- partial oxidation reactions. Apart from Gd-doped ceria, Sm-doped ceria also could be an interesting alternative in this kind of composite due to its high ionic conductivity [17]. Obstacles that generally still need to be addressed for the application of dual-phase ceria-based membranes in such an
Alteration of nanomechanical properties of pancreatic cancer cells through anticancer drug treatment revealed by atomic force microscopy
Beilstein J. Nanotechnol. 2021, 12, 1372–1379, doi:10.3762/bjnano.12.101
- /or the cytoskeleton, which cause cancer cell death [8][9]. Fang et al. found that N-methyl-ᴅ-aspartate (NMDA) binding to NMDA receptors on cell membranes will increase the overall contractile forces in the cytoskeleton, thus increasing the pre-existing mechanical stress [10]. Yun et al. reported that
- ultrastructure of living cells [15][16], cell membranes, membrane proteins [17][18] and DNA [19], and through recording single molecular force spectra [20][21]. However, the morphology and the nanoscale mechanical properties of malignant pancreatic cancer cells (PCCs) under anticancer drug treatment have not
- membranes were stained with Hoechst 33342 (1 µg/mL) or AF488-WGA (1 µg/mL) for 10 min. Then, the cells were rinsed three times with PBS before imaging with laser confocal microscopy. To investigate the effect of DOX on the nanostructure of MIA-PaCa-2, cell nuclei and the cytoskeleton were stained with DAPI
Electrical, electrochemical and structural studies of a chlorine-derived ionic liquid-based polymer gel electrolyte
Beilstein J. Nanotechnol. 2021, 12, 1252–1261, doi:10.3762/bjnano.12.92
- patterns of the electrolyte membranes are depicted in Figure 2a–e. The XRD pattern of pure PVdF-HFP can be marked according to the α, β, and γ PVdF crystalline phases. From Figure 2a, it can be seen that pure PVdF-HFP possesses well-defined peaks at 18.4, 20.4, 25.6, and 38°. The peak at 18.4° [20
- (ACN) was obtained from Merck. All the chemicals were used without further purification. Preparation of IL-polymer gel electrolyte membranes The electrolyte films were synthesized by using the standard solution casting technique. Details can be seen in our previous articles [10][11]. Briefly, different
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