Antimicrobial metal-based nanoparticles: a review on their synthesis, types and antimicrobial action

• Matías Guerrero Correa,
• Fernanda B. Martínez,
• Cristian Patiño Vidal,
• Camilo Streitt,
• Juan Escrig and
• Carol Lopez de Dicastillo

Beilstein J. Nanotechnol. 2020, 11, 1450–1469, doi:10.3762/bjnano.11.129

• stabilizer or protective agent [42]. Occasionally, a catalyst can be added to accelerate the reaction, as well as a solvent, which can favor the interaction of the chemicals. As an example, we highlight the work of Wang et al. in which well-dispersed spherical nanoparticles with sizes ranging from 20 to 80

• temperature well above their boiling point, facilitating the interaction of the precursors during synthesis. Some examples are Y2O3 [58] and ZnO [59] nanoparticles with different morphologies and sizes. When water is used as the solvent, the method is called the hydrothermal technique, which is an easy and

Growth of a self-assembled monolayer decoupled from the substrate: nucleation on-command using buffer layers

• Robby Reynaerts,
• Kunal S. Mali and
• Steven De Feyter

Beilstein J. Nanotechnol. 2020, 11, 1291–1302, doi:10.3762/bjnano.11.113

• understanding of this already enigmatic process is further impaired by the nature of the solution–solid interface. A number of factors such as the temperature [6][7][8][9], the solvent [10][11][12][13][14][15], the substrate [16][17][18] and the concentration of the building block in solution [19][20][21][22

• proposed molecular model (red and green circles, Figure 2h). Due to this shift, the two (parallel) dimers with a different propagation direction are closer to each other. The molecular model also reveals that the space between four benzene rings may host a molecule of solvent adsorbed edge-on (black arrow

Role of redox-active axial ligands of metal porphyrins adsorbed at solid–liquid interfaces in a liquid-STM setup

• Thomas Habets,
• Sylvia Speller and
• Johannes A. A. W. Elemans

Beilstein J. Nanotechnol. 2020, 11, 1264–1271, doi:10.3762/bjnano.11.110

• single-molecule level, employing scanning tunneling microscopy (STM) [7][8][9]. Since our aim was to stay as close as possible to the laboratory conditions at which catalysis takes place (typically in an organic solvent under ambient conditions), we carried out our STM studies at a solid–liquid interface

• varying the experimental conditions in terms of type of substrate, solvent, solute, and concentration of the solute, we will demonstrate that the ligand can in fact be involved in redox processes in the liquid-STM setup. Results and Discussion One of the possible mechanisms for axial ligand dissociation

• no direct metal atom coordination from the substrate is possible. To our surprise we found a strong influence of the solvent on the success of imaging the molecules with STM. When n-tetradecane was used as the solvent, monolayers of MnTUPCl readily formed on Au(111) (Figure 1c), while poorly

Gas sorption porosimetry for the evaluation of hard carbons as anodes for Li- and Na-ion batteries

• Yuko Matsukawa,
• Fabian Linsenmann,
• Maximilian A. Plass,
• George Hasegawa,
• Katsuro Hayashi and
• Tim-Patrick Fellinger

Beilstein J. Nanotechnol. 2020, 11, 1217–1229, doi:10.3762/bjnano.11.106

• market share of HC and graphite was still 52% and 43%, respectively, and today graphite is almost exclusively used as negative electrode material in commercial LIBs [11]. Graphite with an interlayer distance of 0.335 nm cannot be intercalated by sodium without solvent co-intercalation [9][12][13

• either the reversible or the irreversible capacity [25]. Pores that can be accessed by solvent molecules of the electrolyte will contribute to the irreversible capacity, while smaller ones are suitable for the adsorption of alkali metal ions protected from side reactions with solvent molecules from the

• –electrolyte interphase, HCs can act as molecular sieves. Here, Na ions are adsorbed in the pores in a metal-plating-like mechanism and separated from bigger solvent molecules that suffer from electrochemical reductive decomposition at potentials below ca. 0.8 VLi or towards the alkali metal, respectively

Thermophoretic tweezers for single nanoparticle manipulation

• Jošt Stergar and
• Natan Osterman

Beilstein J. Nanotechnol. 2020, 11, 1126–1133, doi:10.3762/bjnano.11.97

• refraction between the particle and the surrounding solvent is also required. For manipulation of smaller particles and molecules, typically, electrophoretic [4] and electrokinetic [5] forces are used, but they need sophisticated electrode geometries. A combination of optical tweezers and an array of

• , diffusion coefficient D = kBT/6πηa, and thermodiffusion coefficient DT = STD (here ST is the Soret coefficient) in a solvent of viscosity η we dynamically created high-temperature gradients. To limit diffusion of the particle, one has to create an appropriate temperature gradient ∇T to produce a

Straightforward synthesis of gold nanoparticles by adding water to an engineered small dendrimer

• Sébastien Gottis,
• Régis Laurent,
• Vincent Collière and
• Anne-Marie Caminade

Beilstein J. Nanotechnol. 2020, 11, 1110–1118, doi:10.3762/bjnano.11.95

• , yielding compound 3 as a white powder. The 31P NMR spectra of compound 3 were different depending on the solvent used. When D2O was used as the solvent, only the expected set of doublets was observed (21.3 (P=N) ppm and 50.6 (P=S) ppm, JPP = 29 Hz, Figure S5, Supporting Information File 1). However, when

• DMSO was the solvent used, several sets of doublets were observed within the same region (Supporting Information File 1, Figure S6) presumably due to the presence of both the Z and E-isomers of the hydrazones [51]. These isomers were also detected in the 1H NMR spectra as two signals corresponding to

• the CH=N groups (8.13 ppm and 8.42 ppm) when DMSO was used as the solvent. The reaction completion was confirmed by the disappearance of the signal corresponding to the aldehydes in the 1H and 13C NMR spectra. The presence of isomers resulting from the CH=N–NHC(O)CH2NMe3 linkage was confirmed in the

Applications of superparamagnetic iron oxide nanoparticles in drug and therapeutic delivery, and biotechnological advancements

• Maria Suciu,
• Corina M. Ionescu,
• Alexandra Ciorita,
• Septimiu C. Tripon,
• Dragos Nica,
• Hani Al-Salami and
• Lucian Barbu-Tudoran

Beilstein J. Nanotechnol. 2020, 11, 1092–1109, doi:10.3762/bjnano.11.94

• also measures the layer of solvent and solutes permanently or transiently retained on the nanoparticle surface. For example, ultrasmall SPIONs of 10 nm or less (synthesis dimension) can measure a hydrodynamic diameter of 300 nm in water when uncoated, and around 100–150 nm when functionalized. If the

Microwave-induced electric discharges on metal particles for the synthesis of inorganic nanomaterials under solvent-free conditions

• Vijay Tripathi,
• Harit Kumar,
• Anubhav Agarwal and
• Leela S. Panchakarla

Beilstein J. Nanotechnol. 2020, 11, 1019–1025, doi:10.3762/bjnano.11.86

• ]. However, the microwave discharge technique, which is fast, solvent-free, and easy to set up technically, has not been explored to its fullest potential to synthesize different nanomaterials with controlled morphology. In this communication, we report on the microwave-induced electric discharge synthesis

A 3D-polyphenylalanine network inside porous alumina: Synthesis and characterization of an inorganic–organic composite membrane

• Jonathan Stott and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2020, 11, 938–951, doi:10.3762/bjnano.11.78

• ) in porous alumina membranes (ALOX-membranes) with respect to different solvent mixtures (tetrahydrofuran (THF) and dichloromethane (DCM)). It was found that increasing the volume fraction of DCM leads to an increasing amount of fibrillar polymer structures within the porous ALOX-membrane. A three

• -grafted gel might be interesting in membrane separation technology or supported drug release/adsorption systems. We investigate the ability of polyphenylalanine to form organo-gels in situ within a porous inorganic environment with respect to different volume fractions of DCM in the solvent mixture. We

• prefunctionalized with (3-aminopropyl)trimethoxysilane (APTMS) to enable surface-initiated polymerization. The polymerization of PA-NCA was performed in solvent mixtures of THF and DCM, employing different volume fractions of these solvent mixtures. We mainly investigate the morphology of the grafted polypeptitde

Three-dimensional solvation structure of ethanol on carbonate minerals

• Hagen Söngen,
• Ygor Morais Jaques,
• Peter Spijker,
• Christoph Marutschke,
• Stefanie Klassen,
• Ilka Hermes,
• Ralf Bechstein,
• Lidija Zivanovic,
• John Tracey,
• Adam S. Foster and
• Angelika Kühnle

Beilstein J. Nanotechnol. 2020, 11, 891–898, doi:10.3762/bjnano.11.74

• experimental studies exist addressing the interfacial arrangement of other solvent molecules [8][9][10]. This is unfortunate given the relevance of the interaction between organic molecules and carbonate surfaces, for example, in the field of biomineralization [11]. Moreover, by changing the solvent molecule

• , the same feature appears to be a saddle point rather than a maximum in the case of magnesite. At this short tip–sample distance, the solvent–tip approximation [19][20] alone cannot explain the data, but instead the chemical nature and macroscopic shape of the tip plays a crucial role. Hence, the

• from the OH group switch the hydrogen bond back and forth to a neighboring carbonate group within a very similar distance during the simulation run, which we further discuss in Supporting Information File 1. To compare the MD simulations with the AFM data, we use the well-established “solvent–tip

Simulations of the 2D self-assembly of tripod-shaped building blocks

• Łukasz Baran,
• Wojciech Rżysko and
• Edyta Słyk

Beilstein J. Nanotechnol. 2020, 11, 884–890, doi:10.3762/bjnano.11.73

• this research, several factors have been established that can help to control the self-assembly process, such as precursor design [4][5], substrate nature and symmetry [6][7], type of solvent and its concentration, and thermodynamic conditions. The knowledge of the influence of these variables is

• computer modeling, which allows for a versatile examination of various thermodynamic conditions in acceptable time frames. Additionally, it is also a convenient tool to vary multiple factors such as the shape of the molecules, and the type of solvent and substrate. The insight gained from the simulations

Transition from freestanding SnO₂ nanowires to laterally aligned nanowires with a simulation-based experimental design

• Jasmin-Clara Bürger,
• Sebastian Gutsch and
• Margit Zacharias

Beilstein J. Nanotechnol. 2020, 11, 843–853, doi:10.3762/bjnano.11.69

• , diluted in a solvent and deposited on a new substrate [6][10][11][12]. The deposited NWs will be randomly oriented and have to be individually contacted [10][12]. Laterally aligned NWs have the advantage that no transfer from the growth substrate to a new substrate is necessary [10]. Due to their

Quantitative determination of the interaction potential between two surfaces using frequency-modulated atomic force microscopy

• Nicholas Chan,
• Carrie Lin,
• Tevis Jacobs,
• Robert W. Carpick and
• Philip Egberts

Beilstein J. Nanotechnol. 2020, 11, 729–739, doi:10.3762/bjnano.11.60

• with acetone and subsequently ethanol for 20 min with each solvent. The samples were then transferred into the vacuum chamber and baked at 120 °C for 8 h. A non-reflective silicon AFM probe (PPP-NCL, Nanosensors) was used in AFM measurements. TEM images were taken of the AFM tip apex before mounting

Exfoliation in a low boiling point solvent and electrochemical applications of MoO₃

• Matangi Sricharan,
• Bikesh Gupta,
• Sreejesh Moolayadukkam and
• H. S. S. Ramakrishna Matte

Beilstein J. Nanotechnol. 2020, 11, 662–670, doi:10.3762/bjnano.11.52

• mV·s−1. Keywords: 2-butanone; liquid-phase exfoliation; low-boiling point solvent; molybdenum trioxide (MoO3); supercapacitors; Introduction The advent of graphene has opened a new area of research in the field of two-dimensional materials [1]. The extraordinary properties of graphene have led

• aforementioned issues, we exfoliated MoO3 in 2-butanone, an environmentally benign solvent (NFPA 704 health code = 1) with low boiling point (bp = 80 °C) for the first time. We obtained MoO3 concentrations up to 0.57 mg·mL−1 with a yield of 5.7%. It is noteworthy that, the chemical nature of the MoO3 dispersions

• dispersions was recorded using a UV–vis spectrophotometer (Perkin Elmer Lambda 750) in 10 mm quartz cuvettes. The concentrations of dispersions were determined by using thermogravimetric analysis. For this, 4 mL of MoO3 dispersion was filled in a 5 mL beaker followed by drying off the solvent at 80 °C in a

Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties

• Marta Bartel,
• Katarzyna Markowska,
• Marcin Strawski,
• Krystyna Wolska and
• Maciej Mazur

Beilstein J. Nanotechnol. 2020, 11, 620–630, doi:10.3762/bjnano.11.49

• structures are stable in aqueous solution, this may not be the case after addition of surfactants or the exchange of the solvent for a more hydrophobic one. Zhao et al. [23] proposed to incorporate silver nanoparticles into polystyrene/polystyrene sulfonate particles through accumulation of a silver complex

Soybean-derived blue photoluminescent carbon dots

• Shanshan Wang,
• Wei Sun,
• Dong-sheng Yang and
• Fuqian Yang

Beilstein J. Nanotechnol. 2020, 11, 606–619, doi:10.3762/bjnano.11.48

• due to the Raman scattering of the water [35]. The annealed-CDs show no PL under irradiation with UV–vis light. Note that the sharp peaks in Figure 3b represent the Raman scattering of water (solvent) only, indicating that there is no photoluminescence emission from the annealed-CDs under excitation

Luminescent gold nanoclusters for bioimaging applications

• Nonappa

Beilstein J. Nanotechnol. 2020, 11, 533–546, doi:10.3762/bjnano.11.42

• decay channel resulting in highly emissive aggregates [72]. The AIE phenomenon has been observed in several organic compounds of low molecular weight and in polymers [73]. The aggregation-induced luminescence of NCs has been achieved either using solvent-induced aggregation or addition of additives such

Multilayer capsules made of weak polyelectrolytes: a review on the preparation, functionalization and applications in drug delivery

• Varsha Sharma and
• Anandhakumar Sundaramurthy

Beilstein J. Nanotechnol. 2020, 11, 508–532, doi:10.3762/bjnano.11.41

• crosslinking without the need of post treatment [55]. Stable multilayered hollow capsules of N-methyl-2-nitro-diphenylamine-4-diazoresin/m-methylphenol-formaldehyde resin (NDR/MPR) on a PS core based on in situ coupling were found to withstand solvent etching without further processing [55]. The reaction

• capsules that are switchable by two parameters, namely, solvent polarity and temperature [47]. Multilayer β-cyclodextrin films with ferrocene-modified PAA, adamantyl-modified dedrimer and adamantyl-modified poly(isobutene-alt-maleic acid) have been successfully reported with weak PE systems [60][61][88

• and 2) the solvent exchange mechanism wherein lipid molecules dissolved in organic solvents were slowly exchanged with water [108]. The addition of the lipid layer not only provided long term stability but also slowed down the rate of permeation of small molecules through the capsule wall, making them

Interfacial charge transfer processes in 2D and 3D semiconducting hybrid perovskites: azobenzene as photoswitchable ligand

• Nicole Fillafer,
• Tobias Seewald,
• Lukas Schmidt-Mende and
• Sebastian Polarz

Beilstein J. Nanotechnol. 2020, 11, 466–479, doi:10.3762/bjnano.11.38

• conformational change and the associated symmetry breaking makes the transition S0→S1 more likely for the cis-isomer. By irradiating a solution of the ligands in an appropriate solvent at 313 nm (3.96 eV) the photoswitching can be observed via UV–vis absorption spectroscopy (see Figure 1). In the following, we

• temperature. The solvent was removed, and the residue was dissolved in ethyl acetate (EA) and methanol (MeOH) (5:1) and filtered over silica gel. The solvent was removed and a yellowish powder was obtained [61]. The product was characterized by using 1H NMR spectroscopy. 1H NMR (400 MHz, DMSO-d6) n = 1: δ

• nitrosobenzene (1.25 equiv) in glacial acetic acid. After stirring at 80 °C for 24 h a brown precipitate was obtained. The solid was dissolved in DCM and separated from the glacial acetic acid. After washing the organic phase with purified water three times the solvent was removed [62]. Chromatographic

Electrochemically derived functionalized graphene for bulk production of hydrogen peroxide

• Munaiah Yeddala,
• Pallavi Thakur,
• Anugraha A and
• Tharangattu N. Narayanan

Beilstein J. Nanotechnol. 2020, 11, 432–442, doi:10.3762/bjnano.11.34

• dispersing 10 mg of functionalized graphene in 375 µL of the solvent mixture consisting of isopropyl alcohol (IPA, 275 µL), water (50 µL), and N,N-dimethyl formamide (DMF, 50 µL). 3 µL and 5 µL of the above-prepared ink was drop cast over the well-polished GCE and RRDE (GCE disk having 4 mm diameter

Nanoparticles based on the zwitterionic pillar[5]arene and Ag⁺: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549

• Dmitriy N. Shurpik,
• Denis A. Sevastyanov,
• Pavel V. Zelenikhin,
• Pavel L. Padnya,
• Vladimir G. Evtugyn,
• Yuriy N. Osin and
• Ivan I. Stoikov

Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33

• 2D NOESY, ROESY – 400 MHz). The chemical shifts were determined against the signals of residual protons of deuterated solvent (DMSO-d6, D2O). The 2D 1H,1H-ROESY spectra were recorded using the roesyphpr standard pulse sequence at 298 K. The mixing time was 500 ms. The concentration of sample

• with distilled water. The organic layer was separated and dried (molecular sieves, 3 Å), and the solvent was removed under reduced pressure. The residue was dried under reduced pressure for 30 min and a light-yellow viscous oil was obtained. Yield 0.34 g (89%). 1H NMR (400 MHz, DMSO-d6, 298 K) δ (ppm

Correction: Biocatalytic oligomerization-induced self-assembly of crystalline cellulose oligomers into nanoribbon networks assisted by organic solvents

• Yuuki Hata,
• Yuka Fukaya,
• Toshiki Sawada,
• Masahito Nishiura and
• Takeshi Serizawa

Beilstein J. Nanotechnol. 2020, 11, 370–371, doi:10.3762/bjnano.11.27

• ; oligomerization-induced self-assembly; organic solvent; The originally published Figure 4 contains wrong units on the y axes of both depicted CD spectra. The corrected Figure 4 is given below. Corrected Figure 4 of the original publication.

Implementation of data-cube pump–probe KPFM on organic solar cells

• Benjamin Grévin,
• Olivier Bardagot and
• Renaud Demadrille

Beilstein J. Nanotechnol. 2020, 11, 323–337, doi:10.3762/bjnano.11.24

• of the solvent and additives used for the film deposition from solution. The use of PTB7:PC71BM is widely documented. It is now well established that films of good morphology, namely with a nanoscale phase separation, can be obtained from solutions containing 1,8-diiodooctane (DIO) as solvent

Understanding nanoparticle flow with a new in vitro experimental and computational approach using hydrogel channels

• Armel Boutchuen,
• Dell Zimmerman,
• Abdollah Arabshahi,
• John Melnyczuk and
• Soubantika Palchoudhury

Beilstein J. Nanotechnol. 2020, 11, 296–309, doi:10.3762/bjnano.11.22

• synthesis, the ligand mixture of PVP and PEI was heated to dissolution in the solvent TREG at 90 °C for 10 min. The iron precursor, Fe(acac)3 was subsequently added to this reactant mixture and thermally decomposed at 290 °C for 1 h to form the iron oxide NPs. The different biocompatible iron oxide NP

Phase inversion-based nanoemulsions of medium chain triglyceride as potential drug delivery system for parenteral applications

• Eike Folker Busmann,
• Dailén García Martínez,
• Henrike Lucas and
• Karsten Mäder

Beilstein J. Nanotechnol. 2020, 11, 213–224, doi:10.3762/bjnano.11.16

• Kolliphor HS 15. The experimental results indicate, that nanoemulsions with particles of small and tunable size can be easily formed without homogenization by thermal cycling. Keywords: cellular toxicity; isotonicity; nanoemulsion; phase inversion; solvent free; surface properties; Introduction Nanoscaled

• as the flexibility of the nanoparticles [6][7][8][9]. Shock dilution with ice-cold water during phase inversion of the emulsion gives the opportunity to produce nanocapsules without the use of any potentially toxic organic solvent at low energy cost [10][11]. The choice and the amount of the

• solutions of such surfactants increases nonlinearly with the solute concentration due to increasing polymer–solvent hydrogen bonding at low temperatures, which prevents the flow of solvent molecules in the solution and thus affects osmosis. This phenomenon is described by a modified polynomial van’t Hoff