Stereodiscrimination of guests in chiral organosilica aerogels studied by ESR spectroscopy

• Sebastian Polarz,
• Yasar Krysiak,
• Martin Wessig and
• Florian Kuhlmann

Beilstein J. Nanotechnol. 2025, 16, 2034–2054, doi:10.3762/bjnano.16.140

• particularly interesting result was that better performance could be achieved if one attaches bulky, hydrophobic groups directly to the stereocenter. The effect of such neighboring groups on the enantioselectivity highly depends on the distance they have to the stereocenter. Keywords: chirality; confinement

• chemistry; ESR spectroscopy; organic inorganic hybrids; porous materials; Introduction Chiral materials represent an evolving research field that focuses on materials whose structures lack mirror symmetry [1][2][3]. The materials exhibit chirality, and a good overview of important developments was given by

• Kotov and coworkers [4]. Chiral optical materials have unique optical activity, displaying phenomena such as circular dichroism and optical rotation. These characteristics are harnessed in applications like sensors, optical devices, and polarized materials. Material chirality can also lead to unusual

Deep-learning recognition and tracking of individual nanotubes in low-contrast microscopy videos

• Vladimir Pimonov,
• Said Tahir and
• Vincent Jourdain

Beilstein J. Nanotechnol. 2025, 16, 1316–1324, doi:10.3762/bjnano.16.96

• , finding numerous applications in scientific research. Deep learning models have been used to identify two-dimensional materials in microscopic images [6], characterize mineral composition in scanning electron microscopy (SEM) samples [7], and determine nanotube chirality from transmission electron

• adds useful information to the video. Additionally, differential videos capture other processes causing local changes in optical absorption. For instance, if the nanotube structure (also called helicity or chirality) changes during growth, this manifests as a second segment moving synchronously with

• the first one: The new chirality appears either as a bright segment if it has lower optical absorption, or as a dark segment otherwise. If the nanotube switches from growth to shrinkage, it appears as a single bright segment moving backward, corresponding to lower optical absorption [20]. We developed

Electronic and optical properties of chloropicrin adsorbed ZnS nanotubes: first principle analysis

• Prakash Yadav,
• Boddepalli SanthiBhushan and
• Anurag Srivastava

Beilstein J. Nanotechnol. 2025, 16, 1184–1196, doi:10.3762/bjnano.16.87

• ZnS NT with (3,3) chirality is illustrated in Figure 2. The structural analysis reveals an average Zn–S bond length of 2.29 Å, which is slightly shorter than the bond length of bulk ZnS (2.34 Å). This reduction in bond length can be attributed to the curvature of the NT structure, which induces a

Soft materials nanoarchitectonics: liquid crystals, polymers, gels, biomaterials, and others

• Katsuhiko Ariga

Beilstein J. Nanotechnol. 2025, 16, 1025–1067, doi:10.3762/bjnano.16.77

• treatment enabled the axis of linearly polarized electroluminescence to be rotated by 90°. These findings suggest that the molecular chirality, in conjunction with the tilted orientation of the chromophores within the liquid crystal molecules, induces a macroscopic electric polarization, resulting in a bulk

Radiosensitizing properties of dual-functionalized carbon nanostructures loaded with temozolomide

• Radmila Milenkovska,
• Nikola Geskovski,
• Dushko Shalabalija,
• Ljubica Mihailova,
• Petre Makreski,
• Dushko Lukarski,
• Igor Stojkovski,
• Maja Simonoska Crcarevska and
• Kristina Mladenovska

Beilstein J. Nanotechnol. 2025, 16, 229–251, doi:10.3762/bjnano.16.18

• sp3-hybridization of the carbon atoms in the CNTs; the position and intensity of the G band related to the E2g phonon mode of sp2-bonded carbon atoms in the 1600–1500 cm−1 region; the bands from the so-called low-frequency radial breathing mode (below 300 cm−1), sensitive to the diameter and chirality

Bolometric IR photoresponse based on a 3D micro-nano integrated CNT architecture

• Yasameen Al-Mafrachi,
• Sandeep Yadav,
• Sascha Preu,
• Jörg J. Schneider and
• Oktay Yilmazoglu

Beilstein J. Nanotechnol. 2024, 15, 1030–1040, doi:10.3762/bjnano.15.84

• from similar CNT growth conditions have been published in previous works [7][15]. It was shown that more than 90% of the CNTs grown on the Si wafer were double-walled carbon nanotubes (DWCNTs). The new TEM micrograph in Figure 3a shows the DWCNTs. Diameter and chirality of the carbon nanotubes are

• strongly influenced by the size and morphology of the catalyst particles. A correlation between cluster size and diameter of the CNT grown on it was shown in [15]. The effect of the growth temperature on the diameter distribution and chirality of single-walled carbon nanotubes can be found in [16]. A new

Directed growth of quinacridone chains on the vicinal Ag(35 1 1) surface

• Niklas Humberg,
• Lukas Grönwoldt and
• Moritz Sokolowski

Beilstein J. Nanotechnol. 2024, 15, 556–568, doi:10.3762/bjnano.15.48

• Figure 2c. We suppose that the adsorption of a QA molecule at the step edge on the upper/lower terrace induces a local change in the electron density at the step edge. This favors a specific adsorption site of a second QA molecule with the same chirality and azimuthal orientation at the step edge on the

• orientations A–D are identical to those that were already observed on the nominally flat Ag(100) surface [23]. The chain directions A and C, as well as B and D, exhibit equivalent adsorption sites because of a mirror symmetry. Note that the adsorbed molecules in A(C) and B(D) are of the same chirality R(L

• ). For the chain orientation E there exists the energetically equivalent chain with molecules of the opposite chirality. The color code of the atoms is: black = carbon, gray = hydrogen, blue = nitrogen, and red = oxygen. (b) Structural formula and hard-sphere model with dimensions of QA. The nominal van

Two-dimensional molecular networks at the solid/liquid interface and the role of alkyl chains in their building blocks

• Suyi Liu,
• Yasuo Norikane and
• Yoshihiro Kikkawa

Beilstein J. Nanotechnol. 2023, 14, 872–892, doi:10.3762/bjnano.14.72

• , the mixture of homogeneous (CCn–CCn) and heterogeneous (OCn–CCn) dimers formed lozenge and linear structures. Thus, the proportion of these interdigitated dimers determines the 2D structure of the blend system. 6 Chirality The chiral information of alkyl chain units can be transferred to

• supramolecular 2D assemblies, and the chirality of 2D structures composed of achiral molecular building blocks can be induced even upon the use of chiral solvents [144][145][146][147]. As stated in the above section 3.2, DBA derivatives formed hexagonal porous structures (Figure 6). Although the DBA molecule is

• was observed in the monolayer via self-assembly in (R)-2-octanol (Figure 14b,f). The induction of chirality was greater than 90% of the surface, and the CW and CCW domains were equally created when racemic 2-octanol was used. A pair of chiral solvents and DBA molecules formed upon interaction were

Current-induced mechanical torque in chiral molecular rotors

• Richard Korytár and
• Ferdinand Evers

Beilstein J. Nanotechnol. 2023, 14, 711–721, doi:10.3762/bjnano.14.57

• the incoming flux is conserved. This situation arises typically with molecular rotors that exhibit an easy axis of rotation. For quantitative analysis we investigate here a classical model where molecule and wires are represented by a rigid curved path. We demonstrate that in the presence of chirality

• unidirectional rotation in the STM setup requires a degree of symmetry breaking. There are two typical situations, that is, either the molecule by itself exhibits a handedness (chirality) or chirality is imposed by the geometry of the molecular junction [6][10]. The purpose of this article is to provide a

• crossover between both regimes. To exemplify our results, we employ a helical geometry. Helical molecular wires have sparked a lot of attention because of reports of spin-selective transport [16][17][18]. This phenomenon falls under the umbrella term “chirality-induced spin selectivity (CISS)”. The full

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

• agents [6][7][8]. Despite significant progress toward the synthesis of monochiral and chirality-enriched carbon nanotubes, further improvements are of unmet need even at the laboratory scale [3][8]. As SWCNT synthesis yields a distribution of bundled (n,m) types, solubilizing and isolating specific

• facilitate chirality separation. Conventional surfactants such as sodium dodecyl sulfate (SDS) and sodium deoxycholate (DOC), as well as polyethylene glycol-based compositions, are used to obtain high-quality dispersions of individual SWCNTs [3][4][5][10]. Although given surfactants show exemplary

• performance in both individualization and chirality separation of carbon nanotubes, excessive surfactant concentrations are usually required for their complete individualization [2][8][11]. Such excess subsequently introduces an additional step of surfactant removal to recover the SWCNTs in a pristine state

Design of surface nanostructures for chirality sensing based on quartz crystal microbalance

• Yinglin Ma,
• Xiangyun Xiao and
• Qingmin Ji

Beilstein J. Nanotechnol. 2022, 13, 1201–1219, doi:10.3762/bjnano.13.100

• for various sensing applications, including chirality detection due to the high sensitivity to nanogram or picogram mass changes, fast response, real-time detection, easy operation, suitability in different media, and low experimental cost. The sensing performance of QCM is dependent on the surface

• ; chiral surface; chirality recognition; quartz crystal microbalance (QCM); sensing applications; surface architecture; Introduction Chirality is a prevalent phenomenon in nature. Many common biological macromolecules such as proteins, ribose, and cellulose are inherently chiral. Chiral molecules have two

• several pregnant women causing fetal malformation [7], owing to the trace presence of teratogenic (S)-thalidomide in sedative (R)-thalidomide [8]. Hence, chirality detection keeps attracting much attention in the fields of chemistry, biology, and medicine. Especially for the pharmaceutical and food

Tunable high-quality-factor absorption in a graphene monolayer based on quasi-bound states in the continuum

• Jun Wu,
• Yasong Sun,
• Feng Wu,
• Biyuan Wu and
• Xiaohu Wu

Beilstein J. Nanotechnol. 2022, 13, 675–681, doi:10.3762/bjnano.13.59

• linear dispersion of the Dirac fermions [36]. These features proposed for graphene enable novel active devices, including modulators [37], perfect absorbers [38][39], imaging devices [40], detectors [41], waveguides [42][43], polarizers [44], and electromagnetic chirality devices [45]. The strength of

Effects of temperature and repeat layer spacing on mechanical properties of graphene/polycrystalline copper nanolaminated composites under shear loading

• Chia-Wei Huang,
• Man-Ping Chang and
• Te-Hua Fang

Beilstein J. Nanotechnol. 2021, 12, 863–877, doi:10.3762/bjnano.12.65

• ) composites under shear loading are investigated by molecular dynamics simulations. The effects of different temperatures, graphene chirality, repeat layer spacing, and grain size on the mechanical properties, such as failure mechanism, dislocation, and shear modulus, are observed. The results indicate that

• the mechanical properties of carbon materials [31]. In this study, graphene with zigzag and armchair chirality is considered while simulating different properties of graphene monolayers and copper layers, including stress–strain curve variations, the distribution of von Mises stress, the evolution of

• temperature and chirality The stress–strain curves of GPCuNL composites and polycrystalline copper (PCu) at different temperatures and with different graphene chirality are presented in Figure 3, where yield and failure strain are defined as γY and γF, respectively. As shown in Figure 3, the shear stress of

Direct observation of the Si(110)-(16×2) surface reconstruction by atomic force microscopy

• Tatsuya Yamamoto,
• Ryo Izumi,
• Kazushi Miki,
• Takahiro Yamasaki,
• Yasuhiro Sugawara and
• Yan Jun Li

Beilstein J. Nanotechnol. 2020, 11, 1750–1756, doi:10.3762/bjnano.11.157

• nanodots [8][9]. Particularly, the Si(110)-(16×2) reconstructed surface is considered to be an ideal 1D template [4][7][9]. Since this reconstructed surface is reported to be two dimensionally chiral, it has been the subject of many investigations, for example, in efforts to control the chirality for

• characteristic structures were observed in flat and step areas. In the flat area, the 16×2 reconstruction area (solid square) and the disorder area (dotted square) were mixed. The 16×2 reconstruction is known to have chirality with zigzag chains extending in the direction of or [13][21]. In this AFM image, zig

Self-assembly and spectroscopic fingerprints of photoactive pyrenyl tectons on hBN/Cu(111)

• Domenik M. Zimmermann,
• Knud Seufert,
• Luka Ðorđević,
• Tobias Hoh,
• Sushobhan Joshi,
• Tomas Marangoni,
• Davide Bonifazi and
• Willi Auwärter

Beilstein J. Nanotechnol. 2020, 11, 1470–1483, doi:10.3762/bjnano.11.130

• . The molecules interdigitated in both the atetra and btetra directions, with two distinct interdigitation arrangements, inducing organizational chirality of the achiral pyrene units [48]. Based on the model of the assembly depicted in Figure 2b, the array was stabilized by intermolecular noncovalent

• nm ± 0.05 nm (labeled as d in Figure 3b). For each chirality, six distinct rotational orientations of the trans-like molecule 2, separated by 30°, were observed on hBN/Cu(111) (not shown). Although rare, coexisting densely packed arrays could be detected near the step edges (see Figure S7, Supporting

• chirality. Overall, six distinct rotational orientations of the cis-like pyrene molecule 3, separated by 60°, were observed on hBN/Cu(111) (not shown). Binary assemblies The combination of different pyrene derivatives opens pathways to distinct multicomponent assemblies on hBN/Cu(111). For example, the

Hybridization vs decoupling: influence of an h-BN interlayer on the physical properties of a lander-type molecule on Ni(111)

• Maximilian Schaal,
• Takumi Aihara,
• Marco Gruenewald,
• Felix Otto,
• Jari Domke,
• Roman Forker,
• Hiroyuki Yoshida and
• Torsten Fritz

Beilstein J. Nanotechnol. 2020, 11, 1168–1177, doi:10.3762/bjnano.11.101

• , Chiba 263-8522, Japan Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan 10.3762/bjnano.11.101 Abstract 2D materials such as hexagonal boron nitride (h-BN) are widely used to decouple organic molecules from metal substrates. Nevertheless, there are

Scanning tunneling microscopy and spectroscopy of rubrene on clean and graphene-covered metal surfaces

• Karl Rothe,
• Alexander Mehler,
• Nicolas Néel and
• Jörg Kröger

Beilstein J. Nanotechnol. 2020, 11, 1157–1167, doi:10.3762/bjnano.11.100

• near-edge X-ray absorption fine structure spectroscopy [15]. The observed chirality, R-C42H28 and L-C42H28, therefore results from the left or right pair of phenyl groups of a twisted C42H28 molecule being closer to the surface. On Au(111) the formation of homochiral clusters led to remarkable

Molecular architectonics of DNA for functional nanoarchitectures

• Debasis Ghosh,
• Lakshmi P. Datta and
• Thimmaiah Govindaraju

Beilstein J. Nanotechnol. 2020, 11, 124–140, doi:10.3762/bjnano.11.11

• dT20–(APA)20–dT20, extended end-to-end through aromatic interactions, was visualized by AFM (Figure 4c). The left-handedness of the double-helical assembly dT20–(APA)20–dT20 observed in AFM correlated with the CD data. The stimuli-responsiveness of the SFM-supported chirality-imprinted double-helical

Review of advanced sensor devices employing nanoarchitectonics concepts

• Katsuhiko Ariga,
• Tatsuyuki Makita,
• Masato Ito,
• Taizo Mori,
• Shun Watanabe and
• Jun Takeya

Beilstein J. Nanotechnol. 2019, 10, 2014–2030, doi:10.3762/bjnano.10.198

• related to protein metabolism, food products and pharmaceuticals. Such difficult goals can be achieved through a nanoarchitectonics approach, namely molecular imprinting [103][104][105]. Qiu and co-workers developed sensors for chirality detection of amino acid guests using an organic electrochemical

First principles modeling of pure black phosphorus devices under pressure

• Ximing Rong,
• Zhizhou Yu,
• Zewen Wu,
• Junjun Li,
• Bin Wang and
• Yin Wang

Beilstein J. Nanotechnol. 2019, 10, 1943–1951, doi:10.3762/bjnano.10.190

• study the chirality dependence of strain-related quantum transport of BP, we propose an empirical model based on the Wentzel–Kramers–Brillouin (WKB) approximation to describe the transport through the BP device, which could serve as a simple compact model for this emerging device. In this manuscript, we

Chiral nanostructures self-assembled from nitrocinnamic amide amphiphiles: substituent and solvent effects

• Hejin Jiang,
• Huahua Fan,
• Yuqian Jiang,
• Li Zhang and
• Minghua Liu

Beilstein J. Nanotechnol. 2019, 10, 1608–1617, doi:10.3762/bjnano.10.156

• nanotubes, depending on the substituent position in the pyridine ring. However, we did not observe inversion in the helical sense of the formed self-assembled nanostructures due to the macroscopic chirality of nanofibers and nanotubes, which makes them difficult to be directly detected by a microscope. On

• formed 3D network gels. The SEM results reveal that the nanoscale chirality of the 3NCLG assembly is opposite to that of the 2NCLG and 4NCLG assemblies. It is suggested that the nanoscale chirality of the formed nanostructures did not strictly follow the chirality of the chiral carbon centers in

• theory that the formation of assemblies and the chirality of ʟ-glutamic acid was transferred to the cinnamic amide moiety. In our previous work, the self-assembly of cinnamic acid derivatives was photo-responsive, while in this work, we found that the self-assembled molecules of the three gelators did

Synthesis and characterization of quaternary La(Sr)S–TaS₂ misfit-layered nanotubes

• Marco Serra,
• Erumpukuthickal Ashokkumar Anumol,
• Dalit Stolovas,
• Iddo Pinkas,
• Ernesto Joselevich,
• Reshef Tenne,
• Andrey Enyashin and
• Francis Leonard Deepak

Beilstein J. Nanotechnol. 2019, 10, 1112–1124, doi:10.3762/bjnano.10.111

• assigned to the A1g vibration of the 2H-TaS2. Obviously, the diameter, number of layers and chirality varies from one nanotube to the next, and from one batch to the next. This polydispersity leads to the broadening of the peaks and minor shifts in their positions. Increasing the Sr content in the lattice

Structural and optical properties of penicillamine-protected gold nanocluster fractions separated by sequential size-selective fractionation

• Xiupei Yang,
• Zhengli Yang,
• Fenglin Tang,
• Jing Xu,
• Maoxue Zhang and
• Martin M. F. Choi

Beilstein J. Nanotechnol. 2019, 10, 955–966, doi:10.3762/bjnano.10.96

• 1.44 and 1.53 ppm, respectively, are chemically different in the 1H NMR spectrum due to the chirality effect [22] of the adjacent carbon (C* in the right panel of Figure 5). Peak splitting is also observed due to chiral induction in the 1H NMR spectrum of the crude product (spectrum 2) and size

Hydrophilicity and carbon chain length effects on the gas sensing properties of chemoresistive, self-assembled monolayer carbon nanotube sensors

• Juan Casanova-Cháfer,
• Carla Bittencourt and
• Eduard Llobet

Beilstein J. Nanotechnol. 2019, 10, 565–577, doi:10.3762/bjnano.10.58

• onto Au-decorated CNTs [28], in order to enhance the properties required to detect toxic gases. Additionally, the electronic properties of single-wall CNTs heavily depend on chirality, and the conduction properties of single-wall CNT films on top of interdigitated electrodes change dramatically

Nanocellulose: Recent advances and its prospects in environmental remediation

• Katrina Pui Yee Shak,
• Yean Ling Pang and
• Shee Keat Mah

Beilstein J. Nanotechnol. 2018, 9, 2479–2498, doi:10.3762/bjnano.9.232

• exceptional properties of chirality, hydrophilicity, and broad chemical variability [110]. Besides, cellulose is usually considered as a good host material for nanoparticles because cellulose can improve the stability and control the growth of nanoparticles while retaining its special morphology [111