Search results
Search for "strain" in Full Text gives 337 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Classification and application of metal-based nanoantioxidants in medicine and healthcare
Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36
- ]. Figure 2 shows the property of ceria nanoplates with multi-antioxidant activities and the relationship between lattice thickness, Ce3+ concentration, and the resulting strain in ceria with specific surface orientation (100) [32]. Similarly, a large number of different metal-based nanomaterials have been
- generating silver nanoparticles from silver ions, whereas hyaluronic acid enhanced hydrophilicity and strain activities. To enhance wound repair, metal or metal oxide-based nanoantioxidants can be conjugated with miRNA146a. Because of the capability of miRNA146a to downregulate IL-6 and IL-8 expression, this
- thickness, Ce3+ concentration, and the resulting strain in ceria with specific surface orientation (100). Figure 2 was adapted with permission from [32]. Copyright 2023 American Chemical Society. This content is not subject to CC BY 4.0. (a) Percent injected dose (%ID) in blood of EaNA and Cy5-labeled human
On the mechanism of piezoresistance in nanocrystalline graphite
Beilstein J. Nanotechnol. 2024, 15, 376–384, doi:10.3762/bjnano.15.34
- , Technische Universität Darmstadt, 64287 Darmstadt, Germany 10.3762/bjnano.15.34 Abstract Strain sensors are sensitive to mechanical deformations and enable the detection of strain also within integrated electronics. For flexible displays, the use of a seamlessly integrated strain sensor would be beneficial
- applied strain on NCG placed on polyethylene terephthalate (PET) substrates provide intriguing insights into the underlying mechanism. Raman measurements, in conjunction with strain applied to NCG grown on flexible glass, indicate that the strain is concentrated at the grain boundaries for smaller strain
- values. For larger strains, mechanisms such as grain rotation and the formation of nanocracks might contribute to the piezoresistive behavior in nanocrystalline graphene. Keywords: grain boundary; nanocrystalline graphene; strain sensor; Raman; tunneling and destruction; Introduction Flexible strain
Nanomedicines against Chagas disease: a critical review
Beilstein J. Nanotechnol. 2024, 15, 333–349, doi:10.3762/bjnano.15.30
- increased 10-fold (from 0.4 mg/mL for bulk BNZ to 3.99 mg/mL for BNZ-NC) [49]. After oral administration of BNZ-NC to an acute murine model infected with the Nicaragua strain of T. cruzi at 300 mg/kg total dose (TD) (30 days treatment) and 375 mg/kg TD (15 days treatment), which was about half of the 750 mg
- gastrointestinal fluids. BNZ-SNEDDSs resulted in the same percentage of cure (57%) as free BNZ in an acute murine model infected with the Y strain of T. cruzi [52]. In a subsequent report, BNZ and nifurtimox (NFX) were loaded in a solid formulation of SNEDDSs, and their administration at 25 and 50 mg/kg/day (BNZ
- amphotericin B relapsed after immunosuppression with cyclophosphamide, or amastigotes remained in tissues of all mice, particularly in the heart and brain after treating a chronic model of infection with T. cruzi CL strain [66]. The failure of liposomal amphotericin B was likely because therapeutic targets in
Determining by Raman spectroscopy the average thickness and N-layer-specific surface coverages of MoS2 thin films with domains much smaller than the laser spot size
Beilstein J. Nanotechnol. 2024, 15, 279–296, doi:10.3762/bjnano.15.26
- of MoS2 flakes produced by different methods. Among these techniques, Raman spectroscopy is widely used thanks to its convenience, non-destructiveness, and sensitivity to materials change, including strain, temperature, doping, and defects [26]. Concerning the characterization of MoS2 flakes
- factors (e.g., stacking, strain, doping, and defects), the Raman intensities measured with a single laser wavelength close to exciton energies can be affected by external factors and differ for samples elaborated by different methods. For these reasons and in the aim to use Raman spectroscopy to count the
- exfoliated MoS2, because the A1g and E12g frequencies, and thus the value of ΔωA−E, can be affected by different factors such as stacking order, strain, doping, and defects which can be present in MoS2 flakes prepared by other ways [44][46][47][48][49]. To evaluate the number of layers, we can also use
Ultrasensitive and ultrastretchable metal crack strain sensor based on helical polydimethylsiloxane
Beilstein J. Nanotechnol. 2024, 15, 270–278, doi:10.3762/bjnano.15.25
- durability. These impressive attributes are attributed to the deliberate design of geometric structures and careful selection of connection types for the sensing materials, thereby presenting a novel approach to fabricating stretchable and highly sensitive crack-strain sensors. This work offers a universal
- platform for constructing strain sensors with both high sensitivity and stretchability, showing a far-reaching significance and influence for developing next-generation practically applicable soft electronics. Keywords: crack sensors; helical structure; polydimethylsiloxane (PDMS); ultrahigh sensitivity
- ], monitoring human health [6][7][8], medical treatment [9][10], soft robotics [11][12], and human–computer interaction [13][14][15]. Numerous flexible strain sensors employing various mechanisms such as piezoresistivity [16][17], capacitance [18][19], and piezoelectricity have been developed to fulfill the
Design, fabrication, and characterization of kinetic-inductive force sensors for scanning probe applications
Beilstein J. Nanotechnol. 2024, 15, 242–255, doi:10.3762/bjnano.15.23
- microscopy based on electromechanical coupling due to a strain-dependent kinetic inductance of a superconducting nanowire. The force sensor is a bending triangular plate (cantilever) whose deflection is measured via a shift in the resonant frequency of a high-Q superconducting microwave resonator at 4.5 GHz
- . We present design simulations including mechanical finite-element modeling of surface strain and electromagnetic simulations of meandering nanowires with large kinetic inductance. We discuss a lumped-element model of the force sensor and describe the role of an additional shunt inductance for tuning
- ][7]. We recently introduced such a sensor based on the electromechanical coupling between surface strain and kinetic inductance of a superconducting nanowire [8]. In this paper, we describe in detail the fabrication and characterization methods of these kinetic inductive mechano-electric coupling
Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites
Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16
- the attachment of the sample to the measuring system. The frequency-dependent measurement was performed at an initial strain of 1% and at an angular frequency of 0.1–100 rad/s at 30 °C. The number of data points collected was 31. Results and Discussion Characterization of GO-VTES XRD Figure 3 shows
- those reported on graft copolymerization of VTES onto NR [17][18]. Properties of DPNR/GO-VTES Stress–strain curves Figure 10 shows stress–strain curves for DPNR/GO-VTES(a), GO-VTES(b), and DPNR/GO as a control sample. The amount of GO, GO-VTES(a), and GO-VTES(b) used in graft copolymerization was 0.5
- . Table 2 shows the value of stress at strain of 100%, 300%, 500%, stress at break, and strain at break for DPNR/GO-VTES(a), DPNR/GO-VTES(b), and DPNR/GO. The samples DPNR/GO-VTES(a) and DPNR/GO-VTES(b) have higher stress values at 100%, 300%, and 500% than those of DPNR/GO. This was due to silica
Development and characterization of potential larvicidal nanoemulsions against Aedes aegypti
Beilstein J. Nanotechnol. 2024, 15, 104–114, doi:10.3762/bjnano.15.10
- ]. Preliminary larvicidal assay The protocol involved exposing III–IV-instar larvae to terpenes and terpene-based nanoemulsions; the mortality was recorded after 24 h. The laboratory-susceptible reference strain (Bora) from French Polynesia was utilized. The experimental protocol adhered to WHO guidelines with
Berberine-loaded polylactic acid nanofiber scaffold as a drug delivery system: The relationship between chemical characteristics, drug-release behavior, and antibacterial efficiency
Beilstein J. Nanotechnol. 2024, 15, 71–82, doi:10.3762/bjnano.15.7
- mechanism of BBR against a standard strain Staphylococcus aureus, whereby BBR inhibits the synthesis of the cell wall and an aromatic amino acid induces oxidative damage and decreases stress resistance. Besides, BBR was found to inhibit MRSA biofilm formation with the concentration in the range of 1–64 mg/L
- used to prepare all solutions. All the chemicals were used without any purification. Methicillin-resistant Staphylococcus aureus bacterial strain were isolated from clinical samples of hospitalized patients and stored according to Clinical and Laboratory Standards Institute (CLSI) regulations. The
- microbiological associates-104 cell line is an epithelial cell from fetal kidney of an African green monkey. The bacterial strain and the MA-104 cell line were provided by the National Institute of Hygiene and Epidemiology, Vietnam. Preparation of electrospun PLA, BBR/PLA and BBR NPs/PLA nanofiber scaffolds
Density functional theory study of Au-fcc/Ge and Au-hcp/Ge interfaces
Beilstein J. Nanotechnol. 2023, 14, 1093–1105, doi:10.3762/bjnano.14.90
- matching lattice parameters and following the experimental data if available. Moreover, different mutual positions of the slabs were considered in order to find the best atomic arrangement. It can be easily noticed that (001) faces of Au-fcc and Ge can form an almost strain-free heterostructure if the gold
- same Ge(001) slab. We note that now we get a strain-free interface only in one direction, and we need a few Au and Ge slabs to reduce the lattice strain in the perpendicular direction. Alternatively, the Au-fcc(011)/Ge(001) heterostructure can be built using a Ge slab marked with the green square, as
- ) interface only. To model the heterostructure, we multiply the relevant Au and Ge surfaces (shown in Figure 1d,e) to obtain minimal strain within a reasonable size of the system. Results and Discussion Convergence tests Ideally, the thickness of the slabs should be large enough to ensure that all the surface
Spatial mapping of photovoltage and light-induced displacement of on-chip coupled piezo/photodiodes by Kelvin probe force microscopy under modulated illumination
Beilstein J. Nanotechnol. 2023, 14, 1059–1067, doi:10.3762/bjnano.14.87
- effect of gravity on the displacement is taken into account. The voltage excitation signal is introduced to the LNO terminals as shown in the inset of Figure 2. The material properties of PZT and LNO thin films were derived from the literature and are summarized in Table 1. The strain-charge form is
Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays
Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82
- , they irradiated it with 0.6 W·cm−2 power for 30 s, and the generated heat energy was captured using a IR thermal camera. The test result showed a tenfold increment in sensitivity compared to the visual colour change. Also it was possible to differentiate the targeted bacterial strain from six other
Green SPIONs as a novel highly selective treatment for leishmaniasis: an in vitro study against Leishmania amazonensis intracellular amastigotes
Beilstein J. Nanotechnol. 2023, 14, 893–903, doi:10.3762/bjnano.14.73
- an atmosphere of 5% CO2. For the microscopic analyses, macrophages were grown in 25 cm2 bottles or on glass coverslips in 24-well plates; after 24 h of culture, they were treated for 24 h with different SPION concentrations. This study used the WHOM/BR/75/JOSEFA Leishmania amazonensis strain as a
Two-dimensional molecular networks at the solid/liquid interface and the role of alkyl chains in their building blocks
Beilstein J. Nanotechnol. 2023, 14, 872–892, doi:10.3762/bjnano.14.72
- between the core unit and aliphatic chains. When the meso positions of porphyrins were substituted with normal saturated alkyl chains (P-N), the porphyrin plane and the alkyl chain units exhibited torsional strain, resulting in a tilt angle between the porphyrin core and the direction of the alkyl chain
Ultralow-energy amorphization of contaminated silicon samples investigated by molecular dynamics
Beilstein J. Nanotechnol. 2023, 14, 834–849, doi:10.3762/bjnano.14.68
- , which is another interesting aspect of the analysis methodology. Amorphization coefficient The amorphization coefficient used to characterize damage formation in the irradiated sample is a modification of the strain formula adjusted to the needs of the MD simulations in this work. It is described in
Nanostructured lipid carriers containing benznidazole: physicochemical, biopharmaceutical and cellular in vitro studies
Beilstein J. Nanotechnol. 2023, 14, 804–818, doi:10.3762/bjnano.14.66
- of 1964 and its successive amendments and clarifications. Special attention was paid to Patient Rights in their relationship with health professionals and institutions and the National Law 25326 on the Protection of Personal Data. Parasites The T. cruzi strain K98 (TcI, low virulence) was used
- trypomastigote form was determined from concentration-response curves fitted through a nonlinear regression on GraphPad Prism version 8.0.1 software (San Diego, CA, USA). In vitro anti-amastigote effect Vero cells were infected with the trypomastigote form of GFP-expressing T. cruzi (K98 strain) [57] at a
Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity
Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64
- the medium. The antibacterial effectiveness of the nanocomposite varied among the bacterial strains and pH values, which may be related to the antibacterial mechanism of AgNPs and the cell wall and membrane structure of each bacterial strain [50]. These findings suggest that the antibacterial activity
Transferability of interatomic potentials for silicene
Beilstein J. Nanotechnol. 2023, 14, 574–585, doi:10.3762/bjnano.14.48
- all previously optimized structures were computed using the metric tensor formulation of strain in the density functional perturbation theory (DFPT) [23]. The mechanical stability of the analyzed structures was verified by calculating the so-called Kelvin moduli [24][25]. To calculate the phonons, the
- -relaxed with the conjugate gradient (CG) algorithm and, then, the elastic constants, Cij, were calculated for them using the stress–strain method with the maximum strain magnitude set to 10−6 [30][31]. In the z direction, a vacuum was set to 20 Å. To measure the performance of the analyzed interatomic
![[Graphic 3]](/bjnano/content/inline/2190-4286-14-48-i7.svg?max-width=637&scale=1.18182)
Nanoarchitectonics to entrap living cells in silica-based systems: encapsulations with yolk–shell and sepiolite nanomaterials
Beilstein J. Nanotechnol. 2023, 14, 522–534, doi:10.3762/bjnano.14.43
- brief description of the material aspect, while stability corresponds to the observed overall resistance of the material to mechanical strain. Biological viability focuses on the survival state of the encapsulated biological entities. Both yeast and cyanobacteria release gases as products of their
- been used for yeast cultivation. Two different unicellular microorganisms have been used. The wild-type cyanobacteria Synechococcus elongatus PCC7942 was used as a representative model of phototrophic prokaryotic microorganisms, and a wild-type Saccharomyces cerevisiae strain was selected as a model of
- heterotrophic eukaryotic microorganisms. The cyanobacterial strain has been obtained from stock cultures of a previous research project, developed in the summer of 2021 for the international Genetically Engineered Machine (iGEM) competition by MADRID_UCM 2021 iGEM team [43]. All procedures involving yeast cells
On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets
Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42
- . For example, information on flake size, extent of structural defects, chemical or electronic doping, and strain and layer number can all be extracted from one spectrum [13][14][15][16][17][18]. As such, Raman spectroscopy is widely used by producers to assess the quality of their material, in
Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities
Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31
- standard bacterial strains, 5% sheep blood agar and eosin methylene blue (EMB) media were used. The inoculated plates were kept in an oven at 35 ± 2 °C for 18–24 h. Sterile Müller Hinton broth fluid tubes were prepared in 0.5 McFarland turbidity standard for each bacterial strain. The bacteria were
- bacterial strain. Then the inoculated plates were kept in an oven at 35 ± 2 °C for 18–24 h. The diameters of the inhibition zones formed around the discs in the medium were measured with millimetric rulers. This process was repeated three times for each antibacterial solution. A statistically average value
Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes
Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26
- nitrogen conversion [61][63]. Antibiotics are persistent for long periods of time in natural environment. It is important to note that bacteria that develop resistance to one antibiotic also exhibit resistance to other drugs and chemicals. For example, Dickinson et al. [64] reported that the focal strain
- lowering the cost of treatment. Aside from its magnetic and optical properties, BiFeO3 also exhibits piezoelectric characteristics, photovoltaic effects, switchable ferroelectric diode effects, and spontaneous polarisation enhancement. It is also sensitive to epitaxial strain [88]. Given its intriguing
- photocatalysis over the past few years due to their distinct optical and electronic characteristics [42][88][106]. Simple strain relaxation and short diffusion paths are benefits of 1-D nanostructured materials and are advantageous for the separation of photogenerated carriers [102]. 1-D spindle-like BiVO4
Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating
Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11
- ] synthesized AgNPs on cotton fabrics using laser ablation, while Ahmad et al. [31] deposited AgNPs by the dip and dry method based on surface reduction reactions. However, the difference in expansion coefficients of the given metal layer and substrate can lead to surface defects under strain (cracks, loss of
- cotton textile was used as a substrate. Microbial strains and culture methods Microbiological assays were conducted with a non-pathogenic, published bacteria strain, Escherichia coli (E. coli) SCC1 [62], and a yeast strain, Candida albicans (C. albicans) 1602m 280057, isolated from an infected patient
Frequency-dependent nanomechanical profiling for medical diagnosis
Beilstein J. Nanotechnol. 2022, 13, 1483–1489, doi:10.3762/bjnano.13.122
- loss modulus [14][15][16][17]. These quantities are appropriate for characterizing soft viscoelastic materials, such as biological specimens, whose mechanical response depends on the rate of application of stress or strain. Notably, many measurements on complex biological systems are still reported
Bending and punching characteristics of aluminum sheets using the quasi-continuum method
Beilstein J. Nanotechnol. 2022, 13, 1303–1315, doi:10.3762/bjnano.13.108
- strain distribution, and fracture strength were provided as well as the interfacial mechanics and punching characteristics of each nano-punching model. Model and Methodologies The simulation model of the nano-punching system comprises a punch and a single crystalline Al workpiece, as shown in Figure 1
- were discussed under various conditions. The stress–displacement curve and stress/strain image were used to analyze various mechanical properties. Effect of crystal orientation on the nano-punching process Before discussing the influence of different crystal orientations on the nano-punching process
- is more widely distributed than that of O2. When the punch displacement was d = 120 Å, all of the Al workpieces of the O1, O2, and O3 orientations were broken. Figure 6 shows the shear stress and strain distribution during the unloading process of the O1, O2, and O3 orientations. Because the cutting
Other Beilstein-Institut Open Science Activities
