Electrostatic interplay: The interaction triangle of polyamines, silicic acid, and phosphate studied through turbidity measurements, silicomolybdic acid test, and ²⁹Si NMR spectroscopy

• Anne Jantschke,
• Katrin Spinde and
• Eike Brunner

Beilstein J. Nanotechnol. 2014, 5, 2026–2035, doi:10.3762/bjnano.5.211

• studied in order to visualize the possible influence of hydrophobic interactions. For 29Si NMR spectroscopy aqueous solutions of isotope-labelled sodium [29Si] metasilicate as precursor compound were used. Different silica precursors, such as toxic TMOS (tetramethyl orthosilicate) or TEOS (tetraethyl

• oligomers/silica nanoparticles below the pKa of PAH. The resulting immobilization of higher silicic acid oligomers could indeed be observed by 29Si NMR spectroscopy previously [23]. The soluble silica (mono- and disilicic acid) is almost completely polycondensed into insoluble species (higher silica

Carbon nano-onions (multi-layer fullerenes): chemistry and applications

• Juergen Bartelmess and
• Silvia Giordani

Beilstein J. Nanotechnol. 2014, 5, 1980–1998, doi:10.3762/bjnano.5.207

• product was well soluble in common organic solvents such as ethanol, chloroform and dichloromethane. Evidence for a successful CNO functionalization was derived from 1H NMR spectroscopy, MALDI mass spectrometry and elemental analysis. TEM suggested that the individual CNOs had diameters between 60 and 300

• , the authors estimated that approximately one pyridine functionality per 120 CNO surface carbon atoms was present. The pyridine groups were then decorated with Zn-tetraphenylporphyrin (ZnTPP) what was confirmed by NMR spectroscopy and electrochemistry. No further spectroscopic studies were carried out

• well as Raman spectroscopy were used to verify the successful alkylation of the CNOs. It was reported that the CNO-C16 exhibits an outstanding solubility in a multitude of organic solvents, even in high concentrations of up to 0.1 mg·mL−1. This high solubility enabled the use of 1H NMR spectroscopy

Visible light photooxidative performance of a high-nuclearity molecular bismuth vanadium oxide cluster

• Johannes Tucher and
• Carsten Streb

Beilstein J. Nanotechnol. 2014, 5, 711–716, doi:10.3762/bjnano.5.83

• proposed as a transient species with short lifetime using 51V NMR spectroscopy [46]. In the present case, the anion is electrostatically stabilized by four bismuth(III) ions which coordinate to binding pockets formed on the cluster surface, see Scheme 1. Initial photocatalytic studies using the

Controlled synthesis and tunable properties of ultrathin silica nanotubes through spontaneous polycondensation on polyamine fibrils

• Jian-Jun Yuan,
• Pei-Xin Zhu,
• Daisuke Noda and
• Ren-Hua Jin

Beilstein J. Nanotechnol. 2013, 4, 793–804, doi:10.3762/bjnano.4.90

• -MAS NMR spectroscopy, and the spectra were recorded on a JEOL-400 MHz NMR spectrometer. Raman spectra were recorded with a Renishaw Raman imaging microscope. Radiation of 514 nm from an Ar-ion laser was used as the excitation source. The photoluminescence (phosphorescence) spectra of silica

New hybrid materials based on poly(ethyleneoxide)-grafted polysilazane by hydrosilylation and their anti-fouling activities

• Thi Dieu Hang Nguyen,
• François-Xavier Perrin and
• Dinh Lam Nguyen

Beilstein J. Nanotechnol. 2013, 4, 671–677, doi:10.3762/bjnano.4.75

• kinetics and yields of this reaction have been surveyed by 1H and 13C NMR spectroscopy. The PEO grafting-density onto PSZ by hydrosilylation increases with a reduction of the S–H/allyl ratio and a decrease of the PEO chain-length. The PEO-graft-PSZ (PSZ-PEO) hybrid coatings, which can be used to prevent

• 13C NMR spectroscopy. Figure 2 shows the 1H NMR and 13C NMR spectra of the mixture of the reactants and of the grafting products. In Figure 1 and in Scheme 2, it is found that the structure of the grafted group ≡Si–CH2–CH2–CH2–O– of PSZ-PEO is very close to that of the group ≡Si–CH2–CH2–CH2–N– of the

Preparation of electrochemically active silicon nanotubes in highly ordered arrays

• Tobias Grünzel,
• Young Joo Lee,
• Karsten Kuepper and
• Julien Bachmann

Beilstein J. Nanotechnol. 2013, 4, 655–664, doi:10.3762/bjnano.4.73

• appearance turns to a lustrous black (Figure 5a). The conversion can be monitored by magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. In the 29Si MAS NMR spectrum of an ALD sample (step (d) of Figure 2), a resonance is observed at −108.4 ppm (Figure 5b), which can be assigned to 'Q

Zeolites as nanoporous, gas-sensitive materials for in situ monitoring of DeNO_x-SCR

• Thomas Simons and
• Ulrich Simon

Beilstein J. Nanotechnol. 2012, 3, 667–673, doi:10.3762/bjnano.3.76

• can be measured by different measuring techniques, such as infrared (IR) spectroscopy [2], NMR spectroscopy [3], thermal analysis [4][5][6] and indicator method [7], as well as the amine titration method [8] and temperature-programmed desorption of ammonia (NH3-TPD) [9][10][11]. H-form zeolites are

Magnetic nanoparticles for biomedical NMR-based diagnostics

• Huilin Shao,
• Tae-Jong Yoon,
• Monty Liong,
• Ralph Weissleder and
• Hakho Lee

Beilstein J. Nanotechnol. 2010, 1, 142–154, doi:10.3762/bjnano.1.17

• systems Nuclear magnetic resonance (NMR) can be detected with instruments such as clinical MRI scanners (routinely used for deep tissue whole body imaging), and NMR spectroscopy (used to study proteins and small molecules). Both of these techniques have been used to measure T2 relaxation time for DMR