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

• and hydrogen peroxide. The use of the environmentally most benign oxidant, molecular oxygen (O2), is also possible, but comes with a drawback. To be able to generate an Mn=O complex, the Mn(III) porphyrin first needs to be reduced to a Mn(II) porphyrin, which can subsequently coordinate to O2 and

High permittivity, breakdown strength, and energy storage density of polythiophene-encapsulated BaTiO₃ nanoparticles

• Adnanullah Khan,
• Amir Habib and
• Adeel Afzal

Beilstein J. Nanotechnol. 2020, 11, 1190–1197, doi:10.3762/bjnano.11.103

• , hydrogen peroxide (H2O2, solution 30% w/w, Scharlab, S.L.) and copper(II) sulfate pentahydrate (CuSO4·5H2O, reagent grade, ≥98.0%, Honeywell) solution are added to the BTO-Th mixture. The reaction is performed by stirring the mixture for 7 h at 50 °C. The product is washed with double-distilled water and

Luminescent gold nanoclusters for bioimaging applications

• Nonappa

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

• imaging [91]. Recently Duan et al. reported the synthesis of NIR-luminescent AuNCs capped with N-acetyl-ʟ-cysteine (NAC-CS) for long-time imaging [92]. The Au-NAC-CS NCs were insensitive to hydrogen peroxide and trypsin in contrast to Au NCs coated with BSA or other proteins, allowing for extended imaging

• large amount of ascorbate and an elevated level of hydrogen peroxide, other free radicals and redox ligands appear at the lesions in the brain. Thus, HAuCl4 ions accumulated in the hippocampus can be can be potentially reduced. After tail-vein injection into four-month-old APP/PS1 male mice, imaging was

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

Preparation and in vivo evaluation of glyco-gold nanoparticles carrying synthetic mycobacterial hexaarabinofuranoside

• Gennady L. Burygin,
• Polina I. Abronina,
• Nikita M. Podvalnyy,
• Sergey A. Staroverov,
• Leonid O. Kononov and
• Lev A. Dykman

Beilstein J. Nanotechnol. 2020, 11, 480–493, doi:10.3762/bjnano.11.39

• 0.02% Tween 20 and 0.02% powdered milk for 90 min. The membrane was washed four times for 15 min with PBS containing 0.02% Tween 20. After that, the membrane was treated with a substrate mixture of 0.05% 3,3′-diaminobenzidine and 0.02% hydrogen peroxide in 0.15 M PBS until intense brown dots appeared

• well. After 30 min incubation, the wells were washed twice with 100 μL of PBS containing 0.02% Tween 20, and peroxidase activity was estimated by adding to each well 50 μL of a substrate mixture of 0.03% o-phenylenediamine and 0.02% hydrogen peroxide in 0.1 M sodium citrate buffer (pH 4.5). The enzyme

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

• ; functionalized graphene; H2O2 production; water treatment; Introduction Hydrogen peroxide (H2O2) is identified as one among the most important 100 chemicals in the world, and its applications extend from the pharmaceutical industry to water purification [1][2][3]. Today, a majority of the required H2O2 is

• ), sulfuric acid, and hydrogen peroxide (27% w/v) were obtained from Alfa Aesar. Nafion solution (5% w/w) was purchased from Sigma-Aldrich, and potassium fluoride (KF) and Ce(SO4)2 were obtained from Sisco research laboratories, India. All of the high purity chemicals were employed as-received without any

Poly(1-vinylimidazole) polyplexes as novel therapeutic gene carriers for lung cancer therapy

• Gayathri Kandasamy,
• Elena N. Danilovtseva,
• Vadim V. Annenkov and
• Uma Maheswari Krishnan

Beilstein J. Nanotechnol. 2020, 11, 354–369, doi:10.3762/bjnano.11.26

• peroxidase-conjugated secondary antibodies (dilution 1:5000, Cell Signaling Technology, USA) at room temperature. The protein spots were visualized using tetramethyl benzidine/hydrogen peroxide (TMB/H2O2, Bio-Rad, USA) reagent. Membranes were stripped, reblocked, and re-incubated with the primary antibody

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

• amplification pathway, the target DNA triggered the release of GOD-S that catalyzed glucose to form hydrogen peroxide, followed by changing the ECL signal. The ECL sensing solution was made up of tripropylamine (TPrA) and glucose (10 mM). The concentration of target DNA could easily be assessed by quantifying

• the ECL quenching via formation of hydrogen peroxide. Kim and co-workers developed an innovative approach of intercalation of the anticancer drug doxorubicin within the DNA tetrahedron that showed improved therapeutic efficacy in drug-resistant breast cancer cells [70]. The doxorubicin-encapsulated

Synthesis of amorphous and graphitized porous nitrogen-doped carbon spheres as oxygen reduction reaction catalysts

• Maximilian Wassner,
• Markus Eckardt,
• Andreas Reyer,
• Thomas Diemant,
• Michael S. Elsaesser,
• R. Jürgen Behm and
• Nicola Hüsing

Beilstein J. Nanotechnol. 2020, 11, 1–15, doi:10.3762/bjnano.11.1

• ) the ring current densities and (Figure 8c,f) the hydrogen peroxide yield. First of all, the data indicate that the carbon NCS-550 spheres are essentially inactive, while with higher nitriding temperatures the NCS samples are significantly more active. For the NCS-550 sample, this inactivity is at

• shell. Also when comparing the H2O2 yields of the TaON@NCS composites [33], we find no advantage of the composite catalysts since the hydrogen peroxide yields are around 40% for all catalysts, which is higher than the values obtained for the pure nitrided carbon spheres (mostly around 20%). Overall, the

• ) scan. For the calculation of the hydrogen peroxide yield we used Equation 1, where Ir is the measured ring current, Id the disc current and N the collection efficiency of the setup (here the measured value specific for the current setup of N is 0.2): The resistance measurements of the catalyst film

Use of data processing for rapid detection of the prostate-specific antigen biomarker using immunomagnetic sandwich-type sensors

• Camila A. Proença,
• Tayane A. Freitas,
• Thaísa A. Baldo,
• Elsa M. Materón,
• Flávio M. Shimizu,
• Gabriella R. Ferreira,
• Frederico L. F. Soares,
• Ronaldo C. Faria and
• Osvaldo N. Oliveira Jr.

Beilstein J. Nanotechnol. 2019, 10, 2171–2181, doi:10.3762/bjnano.10.210

• -hydroxysulfosuccinimide (Sulfo-NHS), hydrogen peroxide (H2O2, 30%), Tween-20, and 2-(N-morpholino)ethanesulfonic acid hydrate (MES) were purchased from Sigma-Aldrich. Monoclonal (mouse) primary anti-human prostate specific antigen (PSA) antibody, natural human prostate-specific antigen (PSA), and standard and secondary

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

• with its unsaturated analog trilinolein, represent the most prevalent triglycerides in oils. The introduction of mesopores by post-synthetic treatment with hydrogen peroxide and a subsequent calcination step results in the generation of an additional active surface with Brønsted basic sites becoming

• -synthetic modification of the ETS-10: an ion-exchange method [27], acidic treatment [28][29], and treatment with hydrogen peroxide (H2O2) [26][30][31]. The latter approach resulted in a notable pore network modification by introducing larger micropores (≈1–2 nm) and mesopores (≈5–30 nm) in a controllable

• %, Fluka, Sigma-Aldrich) were used. In the post-synthetic treatment of ETS-10, hydrogen peroxide (H2O2, 30 wt %, Merck Millipore) and distilled deionized water (DDW, 0.055 μS conductivity, PureLab flex 3 & 4 water purification systems) were used. Chemicals used in the transesterification reaction and gas

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

• wavelength of 535 nm. The untreated cells were used as negative controls, while cells treated with hydrogen peroxide (100 μM) served as positive controls. The data are expressed as percentage of fluorescence intensity compared to negative controls. The changes in the intracellular level of GSH were measured

Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

• Alexey V. Shaposhnik,
• Dmitry A. Shaposhnik,
• Sergey Yu. Turishchev,
• Olga A. Chuvenkova,
• Stanislav V. Ryabtsev,
• Alexey A. Vasiliev,
• Xavier Vilanova,
• Francisco Hernandez-Ramirez and
• Joan R. Morante

Beilstein J. Nanotechnol. 2019, 10, 1380–1390, doi:10.3762/bjnano.10.136

• glacial acetic acid. A surplus of hydrogen peroxide was added to the solution: where NH3·H2O was added dropwise to cause hydrolytic precipitation of tin oxide as follows: The obtained colloid was precipitated by centrifugation, dried and annealed. Tin dioxide nanopowder was formed as a result of tin acid

Janus-micromotor-based on–off luminescence sensor for active TNT detection

• Ye Yuan,
• Changyong Gao,
• Daolin Wang,
• Chang Zhou,
• Baohua Zhu and
• Qiang He

Beilstein J. Nanotechnol. 2019, 10, 1324–1331, doi:10.3762/bjnano.10.131

• capsule motors were fabricated by layer-by-layer assembly of UCNP-functionalized polyelectrolyte microcapsules, followed by sputtering of a platinum layer onto one half of the capsule. By catalytic decomposition of hydrogen peroxide to oxygen bubbles, the Janus UCNP capsule motors are rapidly propelled

• hydrogen peroxide fuel into oxygen at a speed of up to 110 μm s−1 (22 body lengths per second). Meanwhile, the Janus microcapsules are able to actively adsorb and detect TNT based on the luminescence quenching of the UCNPs by TNT. The combination of efficient self-propulsion and TNT detection by these

• oleic acid (OA, 90%) were obtained from Aladdin Chemistry Co. Ltd. NaOH, NH4F, ethanol, methanol, cyclohexane, trichloromethane, acetonitrile, NaCl, Na2HPO4, and NaH2PO4 were purchased from Tianjin Tianli Chemical Reagent Co. Ltd. Hydrofluoric acid (HF) and hydrogen peroxide (H2O2) were obtained from

Alloyed Pt₃M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction

• Stéphane Louisia,
• Yohann R. J. Thomas,
• Pierre Lecante,
• Marie Heitzmann,
• M. Rosa Axet,
• Pierre-André Jacques and
• Philippe Serp

Beilstein J. Nanotechnol. 2019, 10, 1251–1269, doi:10.3762/bjnano.10.125

• issue for a PEMFC catalyst. A well-known phenomenon of catalyst degradation is due to the formation of hydrogen peroxide near the electrolyte membrane [78]. Moreover, it was shown that in aqueous KNO3 solutions, nitrogen-doped carbon structures were active for ORR with lower H2O2 selectivity than Pt/C

• [79]. During the CV measurements in O2-saturated electrolyte, the amount of hydrogen peroxide produced during the ORR was monitored to compare its production for each catalyst. Figure 5 presents the hydrogen peroxide yield during the ORR for all the catalysts shown before. First, between 1 and 0.7 V

Photoactive nanoarchitectures based on clays incorporating TiO₂ and ZnO nanoparticles

• Eduardo Ruiz-Hitzky,
• Pilar Aranda,
• Marwa Akkari,
• Nithima Khaorapapong and
• Makoto Ogawa

Beilstein J. Nanotechnol. 2019, 10, 1140–1156, doi:10.3762/bjnano.10.114

• , industrial and agricultural wastewater. They are based on the in situ generation of reactive species as hydroxyl radicals (OH•) with high oxidizing capability [24]. AOP include Fenton and photo-Fenton reactions based on the combination of chemical oxidants, e.g., hydrogen peroxide, and UV irradiation, and

Glucose-derived carbon materials with tailored properties as electrocatalysts for the oxygen reduction reaction

• Rafael Gomes Morais,
• Natalia Rey-Raap,
• José Luís Figueiredo and
• Manuel Fernando Ribeiro Pereira

Beilstein J. Nanotechnol. 2019, 10, 1089–1102, doi:10.3762/bjnano.10.109

• potentials (0.75–0.78 V and 0.30–0.33 V), indicating that the ORR mechanism proceeds via the two-electron pathway. These results are corroborated by the experiments performed with a rotating ring disk electrode, from which the production of hydrogen peroxide was evaluated. More than 18% of hydrogen peroxide

• positive onset potential of sample AGBM is due to its higher conductance. Moreover, samples AG and AGBM exhibit a second shoulder at more negative potentials, indicating that the ORR mechanism proceeds via the two-electron pathway producing hydrogen peroxide. This second reduction shoulder does not appear

• for ORR. The approximation to a four-electron pathway with the modification of the surface chemistry is important to reduce the amount of hydrogen peroxide produced. The production of H2O2 was only determined for activated samples, since they have a mechanism closer to four-electron, whereas

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

• ROS levels and protect themselves from the deleterious impact of uncontrolled ROS activity. The enzymatic antioxidant defense involves catalase, superoxide dismutase, and glutathione peroxidase, which convert harmful oxidative products first to hydrogen peroxide and then to water. These processes are

• functional groups. In this study, magnetite (Fe3O4) nanoparticles were synthetized by coprecipitation of iron(II) chloride and iron(III) chloride with ammonia and subsequently oxidized with hydrogen peroxide under mild acidic conditions. The resulting maghemite (γ-Fe2O3) has the benefit of higher chemical

• levels after treatment with hydrogen peroxide. The density plot in the left panel shows the relationship between cellular volume and complexity. The R1 region in the density plot indicated cell population, whereas the left population outside the R1 region was related to the nanoparticles loosely bound on

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

• Malwina Liszewska,
• Bogusław Budner,
• Małgorzata Norek,
• Bartłomiej J. Jankiewicz and
• Piotr Nyga

Beilstein J. Nanotechnol. 2019, 10, 1048–1055, doi:10.3762/bjnano.10.105

• sulfuric acid (97%; Fluka), hydrogen peroxide (30%; Chempur), ethanol (96%; Chempur) and deionized water. SERS analyte 4-aminothiophenol (97%) was purchased from Sigma-Aldrich. Fabrication of semicontinuous silver films SSFs were fabricated on BK7 glass substrates using the electron beam PVD technique. The

The systemic effect of PEG-nGO-induced oxidative stress in vivo in a rodent model

• Qura Tul Ain,
• Samina Hyder Haq,
• Abeer Alshammari,
• Moudhi Abdullah Al-Mutlaq and
• Muhammad Naeem Anjum

Beilstein J. Nanotechnol. 2019, 10, 901–911, doi:10.3762/bjnano.10.91

• scavenging enzyme that converts hydrogen peroxide (H2O2) into water and oxygen, thus preventing cell damage. A reduction of the acitivity of CAT after PEG-nGO administration was observed as shown in Table 2. One hour after PEG-nGO administration, the decrease in CAT enzyme activity was significant (P* < 0.05

• kinds of SOD exist in all organs of mammals. SOD1, SOD2, and SOD3 are present in the cytoplasm, mitochondria, and extracellular, respectively. SOD converts the superoxide (O2−) produced due to the xenobiotic into oxygen and hydrogen peroxide. The amount of SOD present in the brain, heart, liver, and

• graphite powder, potassium permanganate, phosphoric acid (85%), sulfuric acid (98%), and hydrogen peroxide (30%). Polyethylene glycol (PEG) was used for PEGylation. Thiobarbituric acid (TBA, 0.6%), and trichloroacetic acid (TCA, 20%) were used to estimate the malondialdehyde (MDA) level, sodium phosphate

Thermal control of the defunctionalization of supported Au₂₅(glutathione)₁₈ catalysts for benzyl alcohol oxidation

• Zahraa Shahin,
• Hyewon Ji,
• Rodica Chiriac,
• Nadine Essayem,
• Franck Rataboul and
• Aude Demessence

Beilstein J. Nanotechnol. 2019, 10, 228–237, doi:10.3762/bjnano.10.21

• ], direct synthesis of hydrogen peroxide by the hydrogenation of O2 [3], ozone decomposition [4], selective oxidation reactions [5][6][7][8] and so on. However, a debate regarding the particle size effect on the catalytic activity and the concerns related to the synthesis and stabilization of monodisperse

In situ characterization of nanoscale contaminations adsorbed in air using atomic force microscopy

• Jesús S. Lacasa,
• Lisa Almonte and
• Jaime Colchero

Beilstein J. Nanotechnol. 2018, 9, 2925–2935, doi:10.3762/bjnano.9.271

• , Standard Clean-1 is performed with a solution composed of 5:1:1 parts by volume of Milli-Q water, NH4OH (ammonium hydroxide, 29%) and H2O2 (hydrogen peroxide, 30%). When utilized as sample, the chips with the cantilevers are sonicated for about 1 min in this solution, which removes organic residues. When

• used as cantilevers, the cantilever chips are immersed in the corresponding solution. Before the next step the samples are rinsed with Milli-Q water. The second step (Standard Clean-2) is performed with a solution composed of 5:1:1 parts by volume of Milli-Q water, H2O2 (hydrogen peroxide, 30%), and

The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement

• Nicolae Leopold,
• Andrei Stefancu,
• Krisztian Herman,
• István Sz. Tódor,
• Stefania D. Iancu,
• Vlad Moisoiu and
• Loredana F. Leopold

Beilstein J. Nanotechnol. 2018, 9, 2236–2247, doi:10.3762/bjnano.9.208

• in the solution. Also, at this time, gaseous reaction products were observed, probably due to the O2 released during the decomposition of hydrogen peroxide. No further color changes could be visually observed after 5 min of light exposure, but the reaction mixture was further exposed to light for a

• reaction does not proceed in the absence of an intense light source, regardless of the amount of hydrogen peroxide added in the reaction mixture. It should be mentioned that the formation of stable, SERS-active Cl-AgNP colloids can also be obtained in the absence of hydrogen peroxide, but in this case, the

• complete synthesis of the silver colloids takes several hours. The UV–vis absorption monitoring of the Cl-AgNP synthesis obtained in the absence of hydrogen peroxide is presented in Supporting Information File 1, Figure S2A, whereas the SERS activity of the Cl-AgNPs tested after different times of light

Metal-free catalysis based on nitrogen-doped carbon nanomaterials: a photoelectron spectroscopy point of view

• Mattia Scardamaglia and
• Carla Bittencourt

Beilstein J. Nanotechnol. 2018, 9, 2015–2031, doi:10.3762/bjnano.9.191

• pathway that involves the formation of hydrogen peroxide ions as intermediate [19]. The nitrogen-doped (NCNTs) and the commercial Pt–C electrodes exhibit a one-step process for the ORR with a half-wave potential of −0.1 V associated to a more efficient four-electron pathway that directly produces water as

Electrodeposition of reduced graphene oxide with chitosan based on the coordination deposition method

• Mingyang Liu,
• Yanjun Chen,
• Chaoran Qin,
• Zheng Zhang,
• Shuai Ma,
• Xiuru Cai,
• Xueqian Li and
• Yifeng Wang

Beilstein J. Nanotechnol. 2018, 9, 1200–1210, doi:10.3762/bjnano.9.111

• degree), concentrated sulfuric acid, hydrochloric acid, sodium nitrate, potassium permanganate, hydrogen peroxide, hydrazine hydrate, acetic acid, sodium hydrate, and 1-naphthol were purchased from Sinopharm Chemical Reagent Co., Ltd., China. 2-Hydroxypropyltrimethylammonium chloride chitosan was