Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites

• Nghiem Thi Thuong,
• Le Dinh Quang,
• Vu Quoc Cuong,
• Cao Hong Ha,
• Nguyen Ba Lam and
• Seiichi Kawahara

Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16

• a clear evidence for the formation of a silica layer on the surface of GO as a result of the reaction between GO and VTES. 29Si NMR spectroscopy To understand the degree of hydrolysis and condensation of VTES to form silica during GO modification, 29Si NMR spectra of GO-VTES(a) and GO-VTES(b) were

Exploring internal structures and properties of terpolymer fibers via real-space characterizations

• Michael R. Roenbeck and
• Kenneth E. Strawhecker

Beilstein J. Nanotechnol. 2023, 14, 1004–1017, doi:10.3762/bjnano.14.83

• , this distinction in fundamental chemistry has significant implications for the structures and properties of the resulting fibers. To date, structure–property characterizations of Technora® in the literature have primarily focused on (i) X-ray diffraction (XRD), (ii) nuclear magnetic resonance (NMR

• ) spectroscopy, and (iii) fiber tensile properties. Interestingly, although Technora® is noncrystalline, it can be effectively modeled through XRD as a paracrystalline material such as Kevlar®. Within this framework, the Technora® paracrystalline distortion parameter, a measure of crystalline “sinuosity”, was

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

• during the reduction/stabilization of metal NPs was investigated for the first time by NMR spectroscopy. Keywords: antimicrobial agents; bimetallic nanoparticles; gold/silver core–shell; Leishmania; pentamidine; polycyclodextrin; Introduction Noble metal nanoparticles (NPs), in particular those

• antileishmanial drug pentamidine with Au@Ag NPs produced the nanosystem nanoGSP endowed with excellent stability as evidenced by UV–vis, DLS, and ζ-potential analyses. The role of PolyCD in the reduction/stabilization of NPs processes was investigated by NMR spectroscopy. The analyses of DEPT-edited HSQC NMR

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

• promoted the combination of S-1-phenethylamine, while the ortho-position may combine with R-1-phenethylamine. The QCM results were consistent with the data from 1H NMR spectroscopy. Moreover, the QCM method may also allow for the detection of weak interactions of amides and esters with amines and a slight

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

• absorption spectroscopy (GF-AAS), nuclear magnetic resonance (NMR) spectroscopy, and transmission electron microscopy (TEM) experiments. Physicochemical characteristics of freshly prepared AgNPs Freshly prepared AgNPs coated with PVP, sodium bis(2-ethylhexyl)sulfosuccinate (AOT), and poly(ʟ-lysine) (PLL

• , while the Ag signal evidenced that the captured particles were generated from AgNPs by the reductive power of CYS (Figure 7a) or GSH (Figure 7b). Finally, the fate of GSH during the formation of AgNPs was monitored by 1H NMR spectroscopy (Figure 8). The reaction was conducted in 25 mM of PB to maintain

• ) detector and enabled to work in scanning transmission (STEM) mode to perform EDX analysis. NMR experiments As the incubation of ionic Ag in mGSH media showed the appearance of AgNPs (observed both visually and by TEM), the interaction between AgNO3 and GSH was evaluated by NMR spectroscopy. The spectra of

Gold(I) N-heterocyclic carbene precursors for focused electron beam-induced deposition

• Cristiano Glessi,
• Aya Mahgoub,
• Cornelis W. Hagen and
• Mats Tilset

Beilstein J. Nanotechnol. 2021, 12, 257–269, doi:10.3762/bjnano.12.21

• initially transparent cold finger. The material was left subliming at this temperature in order to accumulate a small quantity of sublimate, sufficient for further analysis. The sublimed material was then collected and analyzed by 1H NMR spectroscopy. The identity of the sublimed material was assessed by

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

• obtained chemicals were used without further purification unless stated otherwise. The purity of 1-phenyloctane, the solvent in which the additional currents were observed, was confirmed by 1H NMR spectroscopy; moreover, the currents were observed in multiple batches of this solvent, of two different

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

• azobenzene molecules in our materials were determined using a combination of methods. A quantitative assertion can be made using 1H NMR spectroscopy of the dissolved particles, which gives a DOI. The conformational change is accompanied by a reduction of the molecule length, which is why a change in layer

• 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

• purification with EA and pentane (PE) (1:2) gave an orange solid. The product was characterized by using 1H NMR spectroscopy. 1H NMR (400 MHz, DMSO-d6) n = 1: δ 7.90–7.84 (m, 6H), 7.71 (d, 2H), 7.60 (d, 2H), 7.42 (t, 4H), 7.34 (m, 3H), 4.39 (d, 2H, CH2, Fmoc), 4.28 (t, 1H, CH, Fmoc), 4.03 (d, 2H, CH2); n = 2

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

• NMR spectroscopy, two-dimensional 1H,1H-NOESY NMR spectroscopy, IR spectroscopy, MALDI–TOF mass-spectrometry and elemental analysis. Association of decasubstituted pillar[5]arenes with Ag+ In addition, the self-association of the obtained macrocycles 2–4 and their aggregation with AgNO3 in water was

• step was the study of the interaction of pillar[5]arenes 3 and 4 with AgNO3 by DLS, UV–vis and 1H, 13C, 2D NMR spectroscopy. It was shown by UV–vis spectroscopy that addition of an excess of AgNO3 to macrocycles 3 and 4 does not lead to an absorption maximum shift. It is worth noting that, in the case

• spectra [10]. Thus, studies of the 3/Ag+ association show the formation of time-stable nanoparticles of macrocycle 3/Ag+ not containing Ag–Ag bonds. To confirm this hypothesis, we studied the interaction of macrocycles 3 and 4 with AgNO3 by 1Н NMR spectroscopy. The analysis of the experimental data

Air oxidation of sulfur mustard gas simulants using a pyrene-based metal–organic framework photocatalyst

• Ghada Ayoub,
• Mihails Arhangelskis,
• Xuan Zhang,
• Florencia Son,
• Timur Islamoglu,
• Tomislav Friščić and
• Omar K. Farha

Beilstein J. Nanotechnol. 2019, 10, 2422–2427, doi:10.3762/bjnano.10.232

• points, filtered using syringe filters and, after dilution with dichloromethane, analyzed by GC-FID to monitor the reaction kinetics. Oxidation products were analyzed by NMR spectroscopy using deuterated methanol as a solvent. Under these conditions, reaction monitoring revealed that complete and

• overoxidation of CEES to 2-chloroethyl ethyl sulfone (CEESO2) was observed, as demonstrated by 1H NMR spectroscopy (Figure S6, Supporting Information File 1). Conclusion In summary, we demonstrated NU-400, a microporous MOF based on a pyrene-2,7-dicarboxylate linker as a highly effective platform for singlet

Mannosylated brush copolymers based on poly(ethylene glycol) and poly(ε-caprolactone) as multivalent lectin-binding nanomaterials

• Stefania Ordanini,
• Wanda Celentano,
• Anna Bernardi and
• Francesco Cellesi

Beilstein J. Nanotechnol. 2019, 10, 2192–2206, doi:10.3762/bjnano.10.212

• number of pendant mannose, as well as the self-assembly behavior in water. Remarkably, when the ratios PEG/PCL were 9:1 or 8:2, the polymerizations achieved high conversions (≥87% after 6 h), as calculated from 1H NMR spectroscopy results (see Figure S2, Supporting Information File 1). The

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

• Alberto Boretti,
• Lorenzo Rosa,
• Jonathan Blackledge and
• Stefania Castelletto

Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207

• with high-spectral-resolution NMR spectroscopy is presented in [13]. In terms of future commercial products that permit nano-MRI to be undertaken at hospitals and for medical research, it will inevitably be required that they be produced in a way that secures the best trade-off between cost and

Synthesis of highly active ETS-10-based titanosilicate for heterogeneously catalyzed transesterification of triglycerides

• Muhammad A. Zaheer,
• David Poppitz,
• Khavar Feyzullayeva,
• Marianne Wenzel,
• Jörg Matysik,
• Radomir Ljupkovic,
• Aleksandra Zarubica,
• Alexander A. Karavaev,
• Andreas Pöppl,
• Roger Gläser and
• Muslim Dvoyashkin

Beilstein J. Nanotechnol. 2019, 10, 2039–2061, doi:10.3762/bjnano.10.200

• or CO2-/NH3-TPD do not guarantee that the mesopores will become accessible for these molecules in a reaction. In our recent study [67], we demonstrated the applicability of pulsed-field gradient (PFG) NMR spectroscopy for measuring self-diffusion coefficients of the long-chain hydrocarbons (up to C19

Magnetic properties of biofunctionalized iron oxide nanoparticles as magnetic resonance imaging contrast agents

• Natalia E. Gervits,
• Andrey A. Gippius,
• Alexey V. Tkachev,
• Evgeniy I. Demikhov,
• Sergey S. Starchikov,
• Igor S. Lyubutin,
• Alexander L. Vasiliev,
• Vladimir P. Chekhonin,
• Maxim A. Abakumov,
• Alevtina S. Semkina and
• Alexander G. Mazhuga

Beilstein J. Nanotechnol. 2019, 10, 1964–1972, doi:10.3762/bjnano.10.193

• nanoparticles designed for use as MRI contrast media are precisely examined by a variety of methods: powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, Mössbauer spectroscopy and zero-field nuclear magnetic resonance (ZF-NMR) spectroscopy. TEM and XRD measurements reveal

• a spherical shape of the nanoparticles with an average diameter of 5–8 nm and a cubic spinel-type crystal structure of space group Fd−3m. Raman, Mössbauer and NMR spectroscopy clearly indicate the presence of the maghemite γ-Fe2O3 phase. Moreover, a difference in the magnetic behavior of uncoated

• spectroscopy; MRI contrast agents; nanocrystalline materials; NMR spectroscopy; Raman spectroscopy; Introduction Nowadays, magnetic nanoparticles (MNPs) are widely used in biology and medicine. A large number of studies [1][2][3][4] have shown different prospects of their use for sample preparation, in

Long-term entrapment and temperature-controlled-release of SF₆ gas in metal–organic frameworks (MOFs)

• Hana Bunzen,
• Andreas Kalytta-Mewes,
• Leo van Wüllen and
• Dirk Volkmer

Beilstein J. Nanotechnol. 2019, 10, 1851–1859, doi:10.3762/bjnano.10.180

• infrared (FTIR) and 19F nuclear magnetic resonance (NMR) spectroscopy. SF6 is an inert, nonflammable and nontoxic gas, which is known to be an excellent dielectric gas for high-voltage applications [15][16]. At the same time, it is also known as one of the most severe greenhouse gases [17][18]. Therefore

Toxicity and safety study of silver and gold nanoparticles functionalized with cysteine and glutathione

• Barbara Pem,
• Igor M. Pongrac,
• Lea Ulm,
• Ivan Pavičić,
• Valerije Vrček,
• Darija Domazet Jurašin,
• Marija Ljubojević,
• Adela Krivohlavek and
• Ivana Vinković Vrček

Beilstein J. Nanotechnol. 2019, 10, 1802–1817, doi:10.3762/bjnano.10.175

• , the mixture of a metallic salt (HAuCl4 or AgNO3), NaBH4, and CYS (as described above) was stirred under argon in ultrapure water at room temperature for 90 minutes. The progress of the reaction was monitored by 1H NMR spectroscopy. Aliquots were taken from the reaction mixture at selected time points

• as average values of five independent measurements. NMR experiments The progress of the reaction in the mixture of biothiols, metallic salts, and/or NaBH4, was followed by 1H and 13C NMR spectroscopy using a Varian INOVA 400 spectrometer (Varian, Palo Alto, CA, USA) operating at 399.6 and 99.9 MHz

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. 2019, 10, 1778–1788, doi:10.3762/bjnano.10.173

• structure of the products was analyzed by 1H NMR spectroscopy and MALDI–TOF mass spectrometry. The NMR spectra of the representative products showed proton signals for cellulose oligomers (Figure 5). In addition, the mass spectra further revealed the successful synthesis of cellulose oligomers (Figure 6

• dispersions was dried at 105 °C for 24 h, followed by weighing. For 1H NMR spectroscopy, ATR-FTIR absorption spectroscopy, and XRD measurements, as much as possible of the supernatant after the final centrifugation was removed by pipette, followed by adding water to the products. The resultant product aqueous

• dispersions with residual organic solvents were lyophilized and then stored at 4 °C until use. Characterization of the products For NMR spectroscopy, the lyophilized products were dissolved in 4% NaOD/D2O to obtain product solutions (≥2% (w/v)). 1H NMR spectra were recorded on an AVANCE III HD500 spectrometer

Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids

• Ilka Simon,
• Julius Hornung,
• Juri Barthel,
• Jörg Thomas,
• Maik Finze,
• Roland A. Fischer and
• Christoph Janiak

Beilstein J. Nanotechnol. 2019, 10, 1754–1767, doi:10.3762/bjnano.10.171

• )3], respectively [76][77]. Propylene carbonate was dried over 4 Å molecular sieves for several days. Characterization was carried out by 1H and 13C NMR spectroscopy. Quantitative anion exchange and IL purity of 99.9% was assessed by ion chromatography (Dionex ICS-1100, with IonPac® AS22, 4 × 250 mm

Layered double hydroxide/sepiolite hybrid nanoarchitectures for the controlled release of herbicides

• Ediana Paula Rebitski,
• Margarita Darder and
• Pilar Aranda

Beilstein J. Nanotechnol. 2019, 10, 1679–1690, doi:10.3762/bjnano.10.163

• ) and d(113) are observed in all the nanoarchitectures formed, confirming the formation of the LDH structure for all the studied LDH/sepiolite ratios. The formation of true hybrid nanoarchitectures was confirmed by infrared and NMR spectroscopy. For this purpose, the spectral region of the OH vibration

Scavenging of reactive oxygen species by phenolic compound-modified maghemite nanoparticles

• Małgorzata Świętek,
• Yi-Chin Lu,
• Rafał Konefał,
• Liliana P. Ferreira,
• M. Margarida Cruz,
• Yunn-Hwa Ma and
• Daniel Horák

Beilstein J. Nanotechnol. 2019, 10, 1073–1088, doi:10.3762/bjnano.10.108

• phenolic compounds Physicochemical characterization The effect of the AA/H2O2 redox system and the phenolic compounds on the molecular structure of chitosan was investigated using ATR-FTIR and 1H NMR spectroscopy. The ATR-FTIR spectra of CS and of chitosans modified with phenolic compounds differed from

• formed, the AA/H2O2 redox system is convenient for chitosan degradation [19][20]. Hydroxyl radicals attack the polysaccharide, forming macroradicals, which are then prone to covalently bind phenolic compounds. According to the ATR-FTIR and 1H NMR spectroscopy results, the structural similarity between CS

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

• fractions, indicating that these AuNCs are of polycrystalline structure. 1H NMR spectroscopy The spectra of D2O solutions of free ligand, crude and fractions obtained from SSSP are presented in Figure 5. The proton peaks are in the range of chemical shifts (δ) 1.4–4.8 ppm and the strong peak at 4.79 ppm is

pH-mediated control over the mesostructure of ordered mesoporous materials templated by polyion complex micelles

• Emilie Molina,
• Mélody Mathonnat,
• Jason Richard,
• Patrick Lacroix-Desmazes,
• Martin In,
• Philippe Dieudonné,
• Thomas Cacciaguerra,
• Corine Gérardin and
• Nathalie Marcotte

Beilstein J. Nanotechnol. 2019, 10, 144–156, doi:10.3762/bjnano.10.14

• ) of the as-synthesized silica network was determined by 29Si MAS-NMR spectroscopy using a Varian VNMRS 300MHz spectrometer. The typical Q4, Q3 and Q2 signals appearing respectively at −110 ppm (SiO2), −100 ppm (SiO3/2) and −90 ppm (SiO(OH)2) were deconvoluted, and the areas were used for calculating D

• condensation degree (D) was quantified by 29Si MAS NMR spectroscopy. Table 2 gathers the data related to the compositions of the materials expressed in weight percentages and mg (organics) per gram of SiO2. Figure 5 shows the N/AA and EO/Si ratio variations in the materials as a function of pH. For all pH

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

• Emmanuel I. Unuabonah,
• Robert Nöske,
• Jens Weber,
• Christina Günter and
• Andreas Taubert

Beilstein J. Nanotechnol. 2019, 10, 119–131, doi:10.3762/bjnano.10.11

• 2Z-HYCA, a sample calcined at 650 °C was investigated with solid-state cross-polarized magic angle spinning nuclear magnetic resonance (CP-MAS-NMR) spectroscopy. The corresponding 29Si, 27Al, and 13C CP-MAS-NMR spectra are shown in Figure 5. The 13C spectrum only shows a prominent peak at 128 ppm

Dielectric properties of a bisimidazolium salt with dodecyl sulfate anion doped with carbon nanotubes

• Doina Manaila Maximean,
• Viorel Cîrcu and
• Constantin Paul Ganea

Beilstein J. Nanotechnol. 2018, 9, 164–174, doi:10.3762/bjnano.9.19

• , yielded the corresponding salt [bisC8ImC10][C12H25OSO3]2 (3). Compound 3 was characterized by several physico-chemical techniques, such as elemental analysis (C, H, N), IR, 1H and 13C NMR spectroscopy, supporting the proposed structure. The exchange of bromide anion with dodecyl sulfate ion was easily

The rational design of a Au(I) precursor for focused electron beam induced deposition

• Ali Marashdeh,
• Thiadrik Tiesma,
• Niels J. C. van Velzen,
• Sjoerd Harder,
• Remco W. A. Havenith,
• Jeff T. M. De Hosson and
• Willem F. van Dorp

Beilstein J. Nanotechnol. 2017, 8, 2753–2765, doi:10.3762/bjnano.8.274

• described in [12]. The products were analyzed by C and H elemental analysis and showed satisfactory values. MeAu(PMe3), anal. calcd for C4H12PAu: C, 16.68; H, 4.20; found: C, 17.15; H, 4.26. Samples were also analyzed by 1H and 31P NMR spectroscopy. MeAu(PMe3): 1H NMR (400 MHz, C6D6, 25 °C) δ 1.20 (d, 3JHP