Mixed oxides with corundum-type structure obtained from recycling can seals as paint pigments: color stability

• Dienifer F. L. Horsth,
• Julia de O. Primo,
• Nayara Balaba,
• Fauze J. Anaissi and
• Carla Bittencourt

Beilstein J. Nanotechnol. 2023, 14, 467–477, doi:10.3762/bjnano.14.37

• together with recycled boehmite. The absorbance spectra indicate the presence of 3+ ions in the samples, which are responsible for the colors. The spectra also confirm the type of structure found via XRD and the oxidation state determined from XPS. SEM images show the characteristic morphology of this type

Conjugated photothermal materials and structure design for solar steam generation

• Chia-Yang Lin and
• Tsuyoshi Michinobu

Beilstein J. Nanotechnol. 2023, 14, 454–466, doi:10.3762/bjnano.14.36

• spectrum (Figure 7b). The average absorbance (weighted by the AM1.5G solar spectrum) of the p-PEGDA hydrogel from 200–2500 nm was about 75.5%, whereas that of solid PEGDA is only 32.6%. The higher absorption capacity of p-PEGDA is due to its rough and porous surface structure, which promotes multiple

Plasmonic nanotechnology for photothermal applications – an evaluation

• A. R. Indhu,
• L. Keerthana and
• Gnanaprakash Dharmalingam

Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33

• absorbance due to changes morphology stem predominantly from changes to the directionality of the LSPR (due to changing curvature and dimensionality of the nanoparticle) and changes to the dynamics between the restoring and exciting forces of the plasmons, such as the mean free path, the relative

• curvature [35]. Finally, changes to the material composition, such as through doping or vacancy processing, can affect the LSPR because of changes in the free electron density, the electron effective mass, and the electronic band structure in general [36][37]. An understanding of the changes in absorbance

• extinction spectra of nanostructures. Illustrative examples of the absorbance spectra for different morphologies of Ag nanoparticles are shown in Figure 2, elucidating the influence of the same. The extinction spectra (the summation of absorption and scattering spectra) from which the shape effects of

Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities

• Akif Hakan Kurt,
• Elif Berna Olutas,
• Fatma Avcioglu,
• Hamza Karakuş,
• Mehmet Ali Sungur,
• Cansu Kara Oztabag and
• Muhammet Yıldırım

Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31

• of the mixtures were measured between 200 and 800 nm wavelengths using a UV–vis double-beam spectrophotometer (Hitachi U-2900). The same method was also applied to the sample of Ch/Q-Ag NPs. Unlike the standards, the Ch/Q-Ag sample was centrifuged, and the absorbance of the supernatant was recorded

• incubated at ambient temperature for 1 h. Afterward, the absorbances of these mixtures were measured between 200 and 800 nm using a UV–vis double-beam spectrophotometer (Hitachi U-2900). The same method was also applied to the sample of Ch/CA-Ag NPs. The absorbance of the blue color solution of the Ch/CA-Ag

• acid hydrate, Cell Proliferation Kit II test (Roche). XTT solution was added to each plate at 50 µL and was incubated for 4 h at 37 °C. Then, the absorbance (optical density, OD) of the solution in each plate was read at 450 nm by a spectrophotometer (BiotekELx800, Winooski, VT, USA). Statistical

Biocatalytic synthesis and ordered self-assembly of silica nanoparticles via a silica-binding peptide

• Mustafa Gungormus

Beilstein J. Nanotechnol. 2023, 14, 280–290, doi:10.3762/bjnano.14.25

• observed around 457 nm (Figure 5e). The position and the width of the absorbance peaks in the UV–vis spectroscopy are determined by the Bragg diffraction of the light in photonic crystal structures and depend on the particle size, extent of the periodicity (i.e., quality of the assembly), and the angle of

• the incident light. The position of the absorbance peak can be calculated using Bragg’s law (Equation 1): where λ is the wavelength of the peak absorbance, d is the diameter of the particles, f is the packing factor (0.74 for hcp structures), n is the refractive index (1.46 for SiO2 [38] and 1 for air

• ), and θ is the angle of the incident light. Using this formula and the average particle sizes obtained from the particle size analysis, the absorbance peak was calculated to be 593 nm for the NH3-only reaction and 453 nm for the NH3 + 1 mM SiBP reaction. The slight difference between the calculated and

Concentration-dependent photothermal conversion efficiency of gold nanoparticles under near-infrared laser and broadband irradiation

• Vikas,
• Raj Kumar and
• Sanjeev Soni

Beilstein J. Nanotechnol. 2023, 14, 205–217, doi:10.3762/bjnano.14.20

• under irradiation is described as: Equation 7 and Equation 8 can be used to determine the amount of heat absorption, the photothermal conversion efficiency, or the temperature rise of the GNP suspension during photothermal interaction. Results and Discussion Spectral absorbance of GNPs The concentration

• -dependent spectral absorbance of GNSs of 40 nm diameter and GNRs with sizes of 25 × 47 nm, 10 × 38 nm, and 10 × 41 nm measured by using a UV–vis spectrophotometer (UV-3200, Labindia Instruments Pvt. Ltd.) is shown in Figure 4. The measured peak absorbance wavelength of the GNPs is in agreement with the

• × 41 nm GNRs show a temperature increase for a longer period of time than GNSs and 25 × 47 nm GNRs. The photothermal stability of the GNPs was examined by measuring the spectral absorbance of GNPs before and after irradiation as shown in Figure S3 (Supporting Information File 1). It is seen that there

Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine

• Zoran M. Marković,
• Milica D. Budimir,
• Martin Danko,
• Dušan D. Milivojević,
• Pavel Kubat,
• Danica Z. Zmejkoski,
• Vladimir B. Pavlović,
• Marija M. Mojsin,
• Milena J. Stevanović and
• Biljana M. Todorović Marković

Beilstein J. Nanotechnol. 2023, 14, 165–174, doi:10.3762/bjnano.14.17

• assay by measuring the absorbance at 540 nm on Tecan Infinite 200 Pro multiplate reader (Tecan Group, Männedorf, Switzerland). The cytotoxicity results were presented as a percentage of the control (untreated cells), which was arbitrary set to 100%. Fluorescence microscopy Hela cells were grown in low

Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating

• Jessica Plé,
• Marine Dabert,
• Helene Lecoq,
• Sophie Hellé,
• Lydie Ploux and
• Lavinia Balan

Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11

• formation and coalescence during UV exposure. When comparing the absorbance spectra for both coatings after 15 s irradiation, the full-widths at half maximum (FMWH) are calculated to be 134 and 131 nm, for Ag@PEG600DA and Ag@PEG600DA/PETIA, respectively (Figure 2c). Consequently, the nanoparticle size

• (Figure 4a) and Ag@PEG600DA/PETIA (Figure 4b) coatings, respectively. The AgNP size dispersion is also slightly higher in the case of Ag@PEG600DA. Both results are coherent with the peak and FMWH values calculated from the absorbance spectra (Figure 2c). Transmission electron microscopy (TEM) cross

• of antimicrobial substances, was then calculated for each material and control sample using Equation 1 and Equation 2. Significance of differences was assessed by the Student’s t-test. where and are the absorbance values of the suspensions collected from the control material and the tested sample

Single-step extraction of small-diameter single-walled carbon nanotubes in the presence of riboflavin

• Polina M. Kalachikova,
• Anastasia E. Goldt,
• Eldar M. Khabushev,
• Timofei V. Eremin,
• Timofei S. Zatsepin,
• Elena D. Obraztsova,
• Konstantin V. Larionov,
• Liubov Yu. Antipina,
• Pavel B. Sorokin and
• Albert G. Nasibulin

Beilstein J. Nanotechnol. 2022, 13, 1564–1571, doi:10.3762/bjnano.13.130

• SWCNT. The dextran–riboflavin binding energy was calculated as Ebind = Etotal − (Edextran + Eriboflavin). Absorbance spectra of CoMoCat SWCNT dispersions in riboflavin (red) and SDS (black). PL maps of CoMoCat SWCNTs in riboflavin dispersion (a) before and (b) after single-step extraction. (a) Optical

Non-stoichiometric magnetite as catalyst for the photocatalytic degradation of phenol and 2,6-dibromo-4-methylphenol – a new approach in water treatment

• Joanna Kisała,
• Anna Tomaszewska and
• Przemysław Kolek

Beilstein J. Nanotechnol. 2022, 13, 1531–1540, doi:10.3762/bjnano.13.126

• C18 H, with precolumn). The analysis conditions were as follows: mobile phase: 70% acetonitrile and 30% water; flow rate: 1.0 cm3·min−1; injection volume: 20 × 10−3 cm3; absorbance detection: 270 and 310 nm for PhOH and DBMP, respectively. External standards of seven concentration levels ranging from

In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles

• Mitzi J. Ramírez-Hernández,
• Mario Valera-Zaragoza,
• Omar Viñas-Bravo,
• Ariana A. Huerta-Heredia,
• Miguel A. Peña-Rico,
• Erick A. Juarez-Arellano,
• David Paniagua-Vega,
• Eduardo Ramírez-Vargas and
• Saúl Sánchez-Valdes

Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124

• incubated at room temperature until the formazan crystals were dissolved. Finally, the absorbance at 570 nm was measured. Photographs of Ag/AgCl nanoparticle biosynthesis from pineapple peel extracts. The photographs were taken at specified times and temperatures. Diffraction patterns of the reaction

Hydroxyapatite–bioglass nanocomposites: Structural, mechanical, and biological aspects

• Olga Shikimaka,
• Mihaela Bivol,
• Bogdan A. Sava,
• Marius Dumitru,
• Christu Tardei,
• Beatrice G. Sbarcea,
• Daria Grabco,
• Constantin Pyrtsac,
• Daria Topal,
• Andrian Prisacaru,
• Vitalie Cobzac and
• Viorel Nacu

Beilstein J. Nanotechnol. 2022, 13, 1490–1504, doi:10.3762/bjnano.13.123

• dissolved in isopropanol (StanChem, Poland). The absorbance was measured at 570 nm with a spectrophotometer (Synergy H1, BioTek). Results and Discussions XRD analysis XRD analysis showed that, for all composites, HA decomposes partially or fully into tricalcium phosphate (Ca3(PO4)2, TCP) during sintering. A

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

• Abu Hashem,
• M. A. Motalib Hossain,
• Ab Rahman Marlinda,
• Mohammad Al Mamun,
• Khanom Simarani and
• Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

• was isolated using a DNA extraction kit (Favorgen Biotech Corp, Taiwan) following manufacturer instructions. A UV–vis spectrophotometer (NanoPhotometer Pearl, Implen GmbH, Germany) was used to assess the extracted DNA content and purity at an absorbance of 260 nm and at an absorbance ratio of A260

Facile preparation of Au- and BODIPY-grafted lipid nanoparticles for synergized photothermal therapy

• Yuran Wang,
• Xudong Li,
• Haijun Chen and
• Yu Gao

Beilstein J. Nanotechnol. 2022, 13, 1432–1444, doi:10.3762/bjnano.13.118

• –visible (UV–vis) absorption spectra were measured with an UV–vis spectrometer (Q-5000, Quawell, America). The amounts of BDP in AB-LNPs were analyzed using UV–vis spectroscopy after the dissolution of AB-LNPs in DMSO by measuring the absorbance at a wavelength of 600 nm. The loading efficiency (LE, %) was

Orally administered docetaxel-loaded chitosan-decorated cationic PLGA nanoparticles for intestinal tumors: formulation, comprehensive in vitro characterization, and release kinetics

• Sedat Ünal,
• Osman Doğan and
• Yeşim Aktaş

Beilstein J. Nanotechnol. 2022, 13, 1393–1407, doi:10.3762/bjnano.13.115

• the absorbance of the CS-coated formulations was found to significantly increase compared to other formulations, which proves strong interaction between cationic CS and negatively charged mucin. This difference was statistically significant in CS-coated formulations (p < 0.05). Penetration of DCX-PLGA

• (LOQ) were determined for validation of the spectrophotometric method used for DCX quantification. Absorbance values for the amount of DCX were converted to concentration according to the standard calibration curve (r2 = 0.994). LOD and LOQ values were calculated as 0.0173 mg/mL and 0.0634 mg/mL

• nanoparticles, the interaction of mucin and DCX-loaded nanoparticle formulations was evaluated spectrophotometrically by turbidity measurements at 650 nm [10][14][79]. The basis of the experiment is to compare the absorbance of the mucin solution at 650 nm as a reference and the absorbance of the mixture of

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

• Nirmalendu S. Mishra and
• Pichiah Saravanan

Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114

• gas chromatograph coupled with a mass spectrometer (GC–MS, Thermo Fisher Scientific) by taking aliquots at 150 min and 330 min. The photocatalytic degradation and mineralization efficiencies were calculated by utilizing the following equations [19]: where Abs(0) symbolizes the initial absorbance, Abs

• (t) represents the absorbance of the samples at varied time intervals, TOC(0) represents the initial TOC, and TOC(t) denotes TOC at varied time intervals. Apparent quantum efficiency The photon harvesting ability of the as-synthesized MBN was evaluated by the apparent quantum efficiency (AQE

• with a zeta potential of −20 mV at a neutral pH. This implies that the surface of MBN-80 is negatively charged above pH 5.08 which results in better adsorptive ability towards positively charged pollutant moieties and vice-versa. Optical studies The UV–vis light harvesting characteristics (absorbance

Supramolecular assembly of pentamidine and polymeric cyclodextrin bimetallic core–shell nanoarchitectures

• Alexandru-Milentie Hada,
• Nina Burduja,
• Marco Abbate,
• Claudio Stagno,
• Guy Caljon,
• Louis Maes,
• Nicola Micale,
• Massimiliano Cordaro,
• Angela Scala,
• Antonino Mazzaglia and
• Anna Piperno

Beilstein J. Nanotechnol. 2022, 13, 1361–1369, doi:10.3762/bjnano.13.112

• nanoGSP; iii) a hyperchromic effect of the Pent band in nanoGSP, although it appears partially overlapped with the ascorbate band at 243 nm. The changes in the UV–vis spectra suggested the interactions of Pent with nanoGS components, and the increase of Pent absorbance in water clearly indicated the

Near-infrared photoactive Ag-Zn-Ga-S-Se quantum dots for high-performance quantum dot-sensitized solar cells

• Roopakala Kottayi,
• Ilangovan Veerappan and
• Ramadasse Sittaramane

Beilstein J. Nanotechnol. 2022, 13, 1337–1344, doi:10.3762/bjnano.13.110

• ]. The elemental Se spectrum (Figure 3f) shows the peaks of Se 3d5/2 (55.65 eV) indicating the existence of Se2− ions [27][29] .This result confirms that the synthesized QDs contain Zn2+, Ag+, Ga3+, S2− and Se2− ions forming I-II-III-VI3-type AgZnGaS1.5Se1.5 QDs. Optical studies The UV–vis absorbance

• –vis–NIR absorption spectrum; (b) Tauc Plot; (c) PL emission; (d) PL decay spectrum of AZGSSe QDs. (a) HRTEM image and (b) EDX spectrum of AZGSSe QDs/TiO2 NFs. (a) UV–vis absorbance spectra; (b) PL decay spectra; (c) PL emission spectra of the AZGSSe/TiO2 NF-based photoanode. Nyquist plot of the

Rapid fabrication of MgO@g-C₃N₄ heterojunctions for photocatalytic nitric oxide removal

• Minh-Thuan Pham,
• Duyen P. H. Tran,
• Xuan-Thanh Bui and
• Sheng-Jie You

Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96

• range (200–400 nm), with a sudden decrease in the visible range. The absorbance of 3% MgO@g-C3N4 is more substantial than the absorbance of 1% MgO@g-C3N4 and 5% MgO@g-C3N4 in the UV and visible ranges. These results indicate that the higher photocatalytic NO removal efficiency of the 3% MgO@g-C3N4

• ) Elemental composition and (b–e) EDS mappings of 3% MgO@g-C3N4. TEM and HR−TEM images of (a, b) MgO@g-C3N4 and (c, d) g-C3N4. The XPS survey (a), HR−XPS C1s (b), N 1s (c), O 1s (d), C 1s (c), and Mg 2s (e, f) of the materials. (a) DRS reflectance spectra, (b) direct bandgap, (c) DRS absorbance spectra, and

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

• Aisha Kanwal,
• Naheed Bibi,
• Sajjad Hyder,
• Arif Muhammad,
• Hao Ren,
• Jiangtao Liu and
• Zhongli Lei

Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93

Spindle-like MIL101(Fe) decorated with Bi₂O₃ nanoparticles for enhanced degradation of chlortetracycline under visible-light irradiation

• Chen-chen Hao,
• Fang-yan Chen,
• Kun Bian,
• Yu-bin Tang and
• Wei-long Shi

Beilstein J. Nanotechnol. 2022, 13, 1038–1050, doi:10.3762/bjnano.13.91

• holes. The bandgap (Eg) of a semiconductor is usually estimated by the Tauc formula (αhν) = A(hv − Eg)n/2, where α is the absorbance, hν is the photon energy, A is a constant, Eg is the bandgap , and n is a constant. For Bi2O3 and MIL101(Fe), as direct bandgap semiconductors, the value of n is 1 [58

DNA aptamer selection and construction of an aptasensor based on graphene FETs for Zika virus NS1 protein detection

• Nathalie B. F. Almeida,
• Thiago A. S. L. Sousa,
• Viviane C. F. Santos,
• Camila M. S. Lacerda,
• Thais G. Silva,
• Rafaella F. Q. Grenfell,
• Flavio Plentz and
• Antero S. R. Andrade

Beilstein J. Nanotechnol. 2022, 13, 873–881, doi:10.3762/bjnano.13.78

• rinsed with 0.1 M HCl for 5 min, water (DNAse/RNAse free) for 1 min, then borate buffer for 5 min under 50 psi pressure before injection of the incubation mixture at 0.5 psi for 5 s. The mixture was separated under 26 kV (reverse polarity) in borate buffer at 25 °C and monitored through UV absorbance

• /ampicillin and incubated overnight at 37 °C, 200 rpm. The plasmids were extracted following the manufacturer protocol of the Wizard® Plus SV Minipreps DNA purification system kit (Promega) and quantified via 260 nm absorbance in a spectrophotometer. The vectors were sequenced by the automated Sanger

• manufacturer’s instructions. The plate was washed three times in borate buffer, and a colorimetric reaction was initiated by adding 3,30,5,50-tetramethylbenzidine (TMB). After incubating the reaction for 15 min, the reaction was stopped by adding 2 M sulfuric acid. Absorbance at 450 nm was recorded and a

Efficient liquid exfoliation of KP₁₅ nanowires aided by Hansen's empirical theory

• Zhaoxuan Huang,
• Zhikang Jiang,
• Nan Tian,
• Disheng Yao,
• Fei Long,
• Yanhan Yang and
• Danmin Liu

Beilstein J. Nanotechnol. 2022, 13, 788–795, doi:10.3762/bjnano.13.69

• KP15 dispersions. The Lambert–Beer law (Equation 3) was then used to measure the concentration of the KP15 dispersions: where A is the absorbance, K is the absorption coefficient of the material, b is the absorbing layer thickness (which in this work is the width of the cuvette, i.e., 1 cm), and C is

• the concentration of the KP15 dispersions. The absorbance A and the absorption coefficient K are related to the wavelength of the incident light. To determine A and K, it is necessary to choose a specific incident wavelength. The bandgap of bulk KP15 is approx. 1.75 eV [20]. However, according to our

• previous study, with thickness reduction of the KP15 nanowires, a surface-state luminescence at 693 nm gradually dominates in the KP15 nanowire [14]. This could affect light absorption properties of KP15 due to its decreased size. To avoid the generation of concentration error caused by the absorbance

Gelatin nanoparticles with tunable mechanical properties: effect of crosslinking time and loading

• Agnes-Valencia Weiss,
• Daniel Schorr,
• Julia K. Metz,
• Metin Yildirim,
• Saeed Ahmad Khan and
• Marc Schneider

Beilstein J. Nanotechnol. 2022, 13, 778–787, doi:10.3762/bjnano.13.68

• organic phase remained uncolored. Samples were then diluted tenfold, and the absorbance was measured at λ = 349 nm in an Infinite M200 plate reader (Tecan group, Männerdorf, Switzerland). The same procedure was followed with the same amount of pure uncrosslinked gelatin, which served as a reference

• ) was added in a concentration of 0.5 mg/mL and the cells were incubated for 4 h on a shaker with 35 rpm at 37 °C protected from light. Subsequently, the absorbance was measured at 550 nm with a plate reader (Synergy 2, BioTek Instruments GmbH, Bad Friedrichshall, Germany). The resulting cell viability

• after substance exposure was calculated based on the absorbance measurements obtained from MTT assay by a percentual ratio to the positive control of 1% Triton X-100 (PanReac AppliChem ITW Reagents, Darmstadt, Germany) and the negative control treated with HBSS according to Equation 1. Statistical

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

• Zehao Lin,
• Zhan Yang and
• Jianguo Huang

Beilstein J. Nanotechnol. 2022, 13, 745–762, doi:10.3762/bjnano.13.66

• pollutant solution was taken out at set intervals to determine the concentration variation of the pollutant solution. Cr(VI) and RhB were chosen as pollutant representatives, and the concentration of the RhB aqueous solution was measured by the absorbance at λ = 553 nm, analyzed through a Shimadzu UV-2450

• water (40.0 mL) to form solution B. The Cr(VI) pollutant solution (1.0 mL), solution A (40.0 μL), and solution B (20.0 μL) were uniformly blended for 6 min, and the absorbance at λ = 540 nm of the mixed solution was recorded by a Shimadzu UV-2450 spectrophotometer to give the concentration of the