Design of a biomimetic, small-scale artificial leaf surface for the study of environmental interactions

• Miriam Anna Huth,
• Axel Huth,
• Lukas Schreiber and
• Kerstin Koch

Beilstein J. Nanotechnol. 2022, 13, 944–957, doi:10.3762/bjnano.13.83

• . tritici, Erysiphaceae), a natural pathogen of wheat. Conidia from infested wheat plants (provided by Prof. Ulrich Schaffrath, Lehrstuhl und Institut für Biologie III (Pflanzenphysiologie), RWTH Aachen, Germany) were cultivated on wheat plants (20 °C, 12 h/12 h day/night rhythm, 76% rel. air humidity

• wet paper towel in a petri dish to achieve 100% relative air humidity. The germination success of 100 conidia on the different surfaces was examined using a digital microscope (VHX-600 DSO, Keyence, Osaka, Japan). Leaf pieces were cut and decolorized with ethanol/acetic acid (3:1, v/v) for 24 h until

• ). This is in accordance with other studies. In Koch et al. [20] and Wang et al. [53] plants in a comparable developmental stage were investigated. A network of densely packed wax platelets was also described for both sides of the leaf [53]. Abiotic factors such as temperature, humidity, pollution, and

Micro-structures, nanomechanical properties and flight performance of three beetles with different folding ratios

• Jiyu Sun,
• Pengpeng Li,
• Yongwei Yan,
• Fa Song,
• Nuo Xu and
• Zhijun Zhang

Beilstein J. Nanotechnol. 2022, 13, 845–856, doi:10.3762/bjnano.13.75

• body width was 23.74 ± 1.53 mm, and the body weight was 5.27 ± 0.16 g. All insects were acclimated under standard laboratory conditions (ventilation room, 25 ± 1 °C, 60% ± 5% humidity, 12 h light/dark cycle) and had free access to standard water and food. All procedures were conducted in accordance

Ethosomal (−)-epigallocatechin-3-gallate as a novel approach to enhance antioxidant, anti-collagenase and anti-elastase effects

• Çiğdem Yücel,
• Gökçe Şeker Karatoprak,
• Sena Yalçıntaş and
• Tuğba Eren Böncü

Beilstein J. Nanotechnol. 2022, 13, 491–502, doi:10.3762/bjnano.13.41

• effectiveness results obtained in our study, and this is also compatible with the literature. Stability studies Stability studies were performed at different conditions (4 and 25 °C + 60% relative humidity) for ETHs and ETHGs. PS and ZP values were periodically monitored once a month. The EGCG contents of ETHs

• significant decrease in the drug content of the formulations was observed after three months at 4 °C (p > 0.005). In formulations stored at 25 °C, ± 60% relative humidity, both the amount of EGCG and the shelf life decreased with increasing temperature. Shelf lives of suspended ETHs were calculated as 25 days

• at 4 °C (correlation coefficient, r2 = 0.994) and 22 days at 25 °C (r2 = 0.991), respectively. In ETHGs, it was determined that the gel was transparent at 4 °C, and transparent/yellowish at 25 °C, ± 60% relative humidity. The gel system showed good physicochemical properties at both 4 and 25 °C. The

The role of sulfonate groups and hydrogen bonding in the proton conductivity of two coordination networks

• Ali Javed,
• Felix Steinke,
• Stephan Wöhlbrandt,
• Hana Bunzen,
• Norbert Stock and
• Michael Tiemann

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

• materials such as Nafion. Despite its high proton conductivity of ca. 0.1 S·cm−1 at 80 °C and 98% relative humidity (r.h.), Nafion exhibits some shortcomings, including high cost, sophisticated manufacturing processes, and stringent operating conditions [8]. Therefore, a variety of new functional network

• strongly humidity- and temperature-dependent. We discuss how differences in the conduction behavior may be related to the respective structural properties. Results and Discussion The compounds [Mg(H2O)2(H3L)]·H2O and [Pb2(HL)]·H2O were synthesized using the linker molecule H5L (see Supporting Information

A non-enzymatic electrochemical hydrogen peroxide sensor based on copper oxide nanostructures

• Irena Mihailova,
• Vjaceslavs Gerbreders,
• Marina Krasovska,
• Eriks Sledevskis,
• Valdis Mizers,
• Andrejs Bulanovs and
• Andrejs Ogurcovs

Beilstein J. Nanotechnol. 2022, 13, 424–436, doi:10.3762/bjnano.13.35

• environmental conditions (20 °C, 40% relative humidity) for one week, the signal level remained at 95% of the initial value. For samples stored under environmental conditions for a month, the signal level remained at 90% of the initial value. The influence of the environment and degree of sample degradation can

A chemiresistive sensor array based on polyaniline nanocomposites and machine learning classification

• Jiri Kroutil,
• Alexandr Laposa,
• Ali Ahmad,
• Jan Voves,
• Vojtech Povolny,
• Ladislav Klimsa,
• Marina Davydova and
• Miroslav Husak

Beilstein J. Nanotechnol. 2022, 13, 411–423, doi:10.3762/bjnano.13.34

• deformation of the polyaniline conjugation chains. The summary of the gas sensor responses for all active layers is shown in Figure 9. All layers show an increasing resistivity as a clear response to CO, CO2, NH3, and NO2. Additionally, to exclude the influence of humidity on the sensor signal, the sensor

• arrays were exposed to various relative humidity levels ranging from 20% to 80% (Figure 10). The obtained results show a decreasing sensor response with increasing RH% value. This change in response toward relative humidity is due to the adsorption of water molecules and an increase of charge

Effect of sample treatment on the elastic modulus of locust cuticle obtained by nanoindentation

• Chuchu Li,
• Stanislav N. Gorb and
• Hamed Rajabi

Beilstein J. Nanotechnol. 2022, 13, 404–410, doi:10.3762/bjnano.13.33

• controlled temperature (25–30 °C) and humidity (30%–40%), kept under natural day/night light and fed with fresh vegetables. Prior to any experiment, insects were euthanized with CO2. We used only adult individuals, 21 days after imaginal molt. Hind leg tibiae were cut off directly below the femur–tibia joint

Investigation of a memory effect in a Au/(Ti–Cu)Ox-gradient thin film/TiAlV structure

• Damian Wojcieszak,
• Jarosław Domaradzki,
• Michał Mazur,
• Tomasz Kotwica and
• Danuta Kaczmarek

Beilstein J. Nanotechnol. 2022, 13, 265–273, doi:10.3762/bjnano.13.21

• used. All electrical measurements were made at controlled room temperature (23 °C) and humidity (30% RH) in ambient air. Results Electrical properties The resistivity of the thin film was determined to be 1 × 103 Ω·cm. The type of electrical conductivity was determined on the basis of the sign of the

Engineered titania nanomaterials in advanced clinical applications

• Padmavati Sahare,
• Paulina Govea Alvarez,
• Juan Manual Sanchez Yanez,
• Gabriel Luna-Bárcenas,
• Samik Chakraborty,
• Sujay Paul and
• Miriam Estevez

Beilstein J. Nanotechnol. 2022, 13, 201–218, doi:10.3762/bjnano.13.15

• nanostructures such as nanotubes and nanowires have been utilized in photoelectrochemical sensing for the rapid and precise identification of biological analytes at low concentrations, useful for clinical diagnosis. These nanostructures have been employed for sensing humidity, oxygen, and hydrogen, inclusive of

A comprehensive review on electrospun nanohybrid membranes for wastewater treatment

• Senuri Kumarage,
• Imalka Munaweera and
• Nilwala Kottegoda

Beilstein J. Nanotechnol. 2022, 13, 137–159, doi:10.3762/bjnano.13.10

• collect the ejected polymer fibers. These are set up inside an enclosure in which ambient parameters, such as relative humidity, airflow, and temperature can be controlled. A high voltage is supplied to the metal spinneret. The polymer solution, pumped to the spinneret through the syringe, will be charged

• environmental conditions, primarily the relative humidity and the temperature. The effects of these parameters are interconnected, which makes it difficult to separate the impact of each parameter on the fiber properties. And the effect of each parameter can vary for different polymers such that dissimilar

• using lowly volatile CHCl3 while smooth, nonporous fibers were obtained when using highly volatile THF. The pore formation during electrospinning happens with phase separation, which can occur in two ways, namely thermally induced or vapor-induced, depending on temperature and humidity [38]. Hence, the

A photonic crystal material for the online detection of nonpolar hydrocarbon vapors

• Evgenii S. Bolshakov,
• Aleksander V. Ivanov,
• Andrei A. Kozlov,
• Anton S. Aksenov,
• Elena V. Isanbaeva,
• Sergei E. Kushnir,
• Aleksei D. Yapryntsev,
• Aleksander E. Baranchikov and
• Yury A. Zolotov

Beilstein J. Nanotechnol. 2022, 13, 127–136, doi:10.3762/bjnano.13.9

• . The diffuse reflectance spectra have been recorded automatically by using the standard software “i1Share v1.4” (X-Rite, Incorporated, USA) and a scripting language program that allowed for receiving data on a preset periodic base. Temperature, pressure and humidity were monitored by a BMP280 sensor

Polarity in cuticular ridge development and insect attachment on leaf surfaces of Schismatoglottis calyptrata (Araceae)

• Venkata A. Surapaneni,
• Tobias Aust,
• Thomas Speck and
• Marc Thielen

Beilstein J. Nanotechnol. 2021, 12, 1326–1338, doi:10.3762/bjnano.12.98

• temperatures, low humidity, and high light intensity, plants are known to develop thicker and (more) waxy cuticles [38][39][40]. Therefore, as described in the previous section, the ridge development on the leaves (Figure 2 and Figure 4) might depend upon the way that leaves are covered and protected (by being

• during mature leaf stages. Experimental Leaf collection and ontogenetic stages S. calyptrata plants (potted plant <0.5 m height) were cultivated in the glass houses of the Botanic Garden of the University of Freiburg, Germany. The average temperature and average relative humidity in the glass houses were

• 23.8 ± 0.4 °C and humidity of 41.5 ± 2.1% RH. Statistics The roughness, traction force and cell size data were analyzed using Kruskal–Wallis test followed by pairwise multiple comparisons using Dunn’s test adjusted with the Bonferroni correction. All statistical tests were performed using R software

Morphology-driven gas sensing by fabricated fractals: A review

• Vishal Kamathe and
• Rupali Nagar

Beilstein J. Nanotechnol. 2021, 12, 1187–1208, doi:10.3762/bjnano.12.88

The role of deep eutectic solvents and carrageenan in synthesizing biocompatible anisotropic metal nanoparticles

• Nabojit Das,
• Akash Kumar and
• Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2021, 12, 924–938, doi:10.3762/bjnano.12.69

• during preparation, and require no further purification, which gives them properties of a green solvent [25]. However, DESs share remarkable features with RTILs such as low vapor pressure, high tolerance to humidity, and high thermostability. The term “deep eutectic solvent” was first coined by Abbott in

Silver nanoparticles nucleated in NaOH-treated halloysite: a potential antimicrobial material

• Yuri B. Matos,
• Rodrigo S. Romanus,
• Mattheus Torquato,
• Edgar H. de Souza,
• Rodrigo L. Villanova,
• Marlene Soares and
• Emilson R. Viana

Beilstein J. Nanotechnol. 2021, 12, 798–807, doi:10.3762/bjnano.12.63

• loss increases substantially. The behaviour is concurrent with an endothermal peak. The endothermal behaviour and the fact that the increased rate of mass loss happens near 100 °C (water boiling temperature) strongly suggests that phase II is an evaporation process of humidity left after phase I. Again

Nanogenerator-based self-powered sensors for data collection

• Yicheng Shao,
• Maoliang Shen,
• Yuankai Zhou,
• Xin Cui,
• Lijie Li and
• Yan Zhang

Beilstein J. Nanotechnol. 2021, 12, 680–693, doi:10.3762/bjnano.12.54

• . Modaresinezhad et al. used a DC nanogenerator based on ZnO nanosheets as room-temperature self-powered humidity sensor [103]. This new type of self-powered gas sensors will be an important development direction for the next generation of gas sensors [95]. In addition, the above self-powered sensors show that

Fate and transformation of silver nanoparticles in different biological conditions

• Barbara Pem,
• Marija Ćurlin,
• Darija Domazet Jurašin,
• Valerije Vrček,
• Rinea Barbir,
• Vedran Micek,
• Raluca M. Fratila,
• Jesus M. de la Fuente and
• Ivana Vinković Vrček

Beilstein J. Nanotechnol. 2021, 12, 665–679, doi:10.3762/bjnano.12.53

• Unit for Laboratory Animals, at the Institute for Medical Research and Occupational Health, Zagreb, Croatia. The animals were kept under specific pathogen-free conditions, in polycarbonate cages with temperature (23 ± 2 °C) and humidity (55 ± 7%) control, with a 12 h light/dark reversed cycle. They

Simulation of gas sensing with a triboelectric nanogenerator

• Kaiqin Zhao,
• Hua Gan,
• Huan Li,
• Ziyu Liu and
• Zhiyuan Zhu

Beilstein J. Nanotechnol. 2021, 12, 507–516, doi:10.3762/bjnano.12.41

• triboelectric materials is helpful for distinguishing different gases. It is noted that water or humidity can degrade the surface charge density of the electrification surfaces in an actual experiment. We will carry out further investigations in the future. Conclusion Simulations of three differently shaped

Nickel nanoparticle-decorated reduced graphene oxide/WO₃ nanocomposite – a promising candidate for gas sensing

• Ilka Simon,
• Alexandr Savitsky,
• Rolf Mülhaupt,
• Vladimir Pankov and
• Christoph Janiak

Beilstein J. Nanotechnol. 2021, 12, 343–353, doi:10.3762/bjnano.12.28

• , formation of heterojunctions, or size reduction [18][19]. Doping of WO3 with nickel improves the humidity sensing compared to neat WO3. Attributed to a greater number of electrons donated by Ni atoms, higher surface area, and smaller bandgap energy, Ni-doped WO3 has a faster response, higher sensitivity

Paper-based triboelectric nanogenerators and their applications: a review

• Jing Han,
• Nuo Xu,
• Yuchen Liang,
• Mei Ding,
• Junyi Zhai,
• Qijun Sun and
• Zhong Lin Wang

Beilstein J. Nanotechnol. 2021, 12, 151–171, doi:10.3762/bjnano.12.12

• (e.g., humidity and height sensors) have been rarely reported. Recently, Ejehi et al. proposed a self-powered humidity sensor based on a graphene oxide (GO) paper-based TENG [151], which showed an outstanding power density as high as 1.3 W·m−2, a Voc of up to 870 V and a Isc of 1.4 µA·cm−2. GO was

• stable thin layer, which could be used as a free-standing friction layer (also electrode) in TENGs. In addition to the applications in energy harvesting, GO can also be readily used to monitor the relative humidity (RH) because of the strong interactions between water molecules and oxygen functional

• groups on its surface. The basis of a GO humidity sensor is the variation of impedance or capacitance owing to the tendency of the water molecules to be adsorbed on the GO surface. The rich functional groups of GO and the flexibility of GO paper deliver the significant potential for a less complicated

A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures

• Sina Kaabipour and
• Shohreh Hemmati

Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9

• humidity [233]. The sol–gel process is associated with costly precursors, process longevity, and difficulties regarding reproducibility [234]. 2.2.2 Reverse-micelle process. The reverse micelle is another approach for the synthesis of AgNPs. Reverse micelles are produced from surfactants such as sucrose

Electron beam-induced deposition of platinum from Pt(CO)₂Cl₂ and Pt(CO)₂Br₂

• Aya Mahgoub,
• Hang Lu,
• Rachel M. Thorman,
• Konstantin Preradovic,
• Titel Jurca,
• Lisa McElwee-White,
• Howard Fairbrother and
• Cornelis W. Hagen

Beilstein J. Nanotechnol. 2020, 11, 1789–1800, doi:10.3762/bjnano.11.161

• . IR (CH2Cl2): νCO 2129, 2170 cm−1. Both precursors are very sensitive to air and humidity and decompose immediately, discolouring to brown if exposed to air. For comparison, commercial samples of the commonly used Pt precursor MeCpPtMe3 are crystalline and colourless at room temperature and the

• compound is not sensitive to air or humidity. Thermogravimetric analysis Thermogravimetric analysis (TGA) of Pt(CO)2X2 was conducted on an ISI TGA-1000 instrument housed inside a nitrogen-atmosphere glove box, using Pt sample pans, with a 5 cc/min flow of ultrahigh-purity N2. The complexes were measured

Selective detection of complex gas mixtures using point contacts: concept, method and tools

• Alexander P. Pospelov,
• Victor I. Belan,
• Dmytro O. Harbuz,
• Volodymyr L. Vakula,
• Lyudmila V. Kamarchuk,
• Yuliya V. Volkova and
• Gennadii V. Kamarchuk

Beilstein J. Nanotechnol. 2020, 11, 1631–1643, doi:10.3762/bjnano.11.146

• humidity rises and the chemical composition of the gaseous medium changes. With an increase in humidity and temperature, the galvanic element, which is integrated in the point-contact gas-sensitive array and generates the electric field, is activated. The field initiates quantum-energy effects in the bulk

• previous one and it is caused by the desorption of the breath components and the return of atmospheric nitrogen molecules to the active centers. It is also initiated by the electric field of the galvanic cell integrated into the point-contact array. Yet, in this case, due to a decrease in humidity and

Walking energy harvesting and self-powered tracking system based on triboelectric nanogenerators

• Mingliang Yao,
• Guangzhong Xie,
• Qichen Gong and
• Yuanjie Su

Beilstein J. Nanotechnol. 2020, 11, 1590–1595, doi:10.3762/bjnano.11.141

• excellent performance, which can be used as motion [35][36][37] and temperature sensors [38][39], UV detectors [40], tactile sensors [41][42][43], sensors for healthcare [44][45][46][47], humidity sensors, and gas sensors [48][49][50][51], for example. In this work, a flexible undulated electrode-based

Triboelectric nanogenerator based on Teflon/vitamin B1 powder for self-powered humidity sensing

• Liangyi Zhang,
• Huan Li,
• Yiyuan Xie,
• Jing Guo and
• Zhiyuan Zhu

Beilstein J. Nanotechnol. 2020, 11, 1394–1401, doi:10.3762/bjnano.11.123

• measured open-circuit voltage was approximately 340 V. The TVB-TENG can be applied as a humidity sensor and exhibits a linear and reversible response to the relative humidity of the environment. Moreover, the change in relative humidity is also indicated by the change in luminosity of a set of light

• -emitting diodes (LEDs) integrated in the TVB-TENG system. The TVB-TENG proposed in this study illustrates a cost-effective method for portable power supply and sensing devices. Keywords: humidity sensor; self-powered system; triboelectric nanogenerators (TENGs); triboelectrification; vitamin B1

• ; Introduction Recently, there has been unprecedented advancement in the internet of things (IoT) technology, which includes environmental monitoring and intelligent community applications. Particularly, humidity sensing has been investigated in environmental monitoring, and in other sectors, such as agriculture