Nanocrystalline ZrO₂ and Pt-doped ZrO₂ catalysts for low-temperature CO oxidation

• Amit Singhania and
• Shipra Mital Gupta

Beilstein J. Nanotechnol. 2017, 8, 264–271, doi:10.3762/bjnano.8.29

• nanoparticles such as sol–gel [21], precipitation [22], combustion [23], hydrothermal synthesis [24], solvothermal synthesis [25], reverse micelles [26], chemical vapor synthesis [27], aerosol pyrolysis [28], and sonochemical synthesis [29]. Dongare et al. [30] described the synthesis of ZrO2 by a sol–gel

Prediction of the mechanical properties of zeolite pellets for aerospace molecular decontamination applications

• Guillaume Rioland,
• Patrick Dutournié,
• Delphine Faye,
• T. Jean Daou and
• Joël Patarin

Beilstein J. Nanotechnol. 2016, 7, 1761–1771, doi:10.3762/bjnano.7.169

• protocol described below. The gel preparation and hydrothermal synthesis were performed using a polypropylene bottle. First, 1.5 g of hydrofluoric acid (Sigma-Aldrich, 40% in water) was poured on 11 g of tetraethylammonium hydroxide (Sigma-Aldrich, 40% in water) used as structure-directing agent. 0.12 g of

Influence of hydrothermal synthesis parameters on the properties of hydroxyapatite nanoparticles

• Sylwia Kuśnieruk,
• Jacek Wojnarowicz,
• Agnieszka Chodara,
• Tadeusz Chudoba,
• Stanislaw Gierlotka and
• Witold Lojkowski

Beilstein J. Nanotechnol. 2016, 7, 1586–1601, doi:10.3762/bjnano.7.153

• Hydroxyapatite (HAp) nanoparticles of tunable diameter were obtained by the precipitation method at room temperature and by microwave hydrothermal synthesis (MHS). The following parameters of the obtained nanostructured HAp were determined: pycnometric density, specific surface area, phase purity, lattice

• found when comparing the properties of some types of nanostructured hydroxyapatite with natural occurring apatite found in animal bones and teeth. Keywords: hydroxyapatite; microwave hydrothermal synthesis; nanoparticle size control; physical properties of HAp NPs; room temperature synthesis

• chemistry techniques, such as direct precipitation from aqueous solutions, electrochemical deposition [23], sol–gel processes [24] and hydrothermal synthesis [25][26][27] (Table 1). In the majority of cases, the synthesized powder is a stoichiometric hydroxyapatite, and oftentimes contains additional phases

Development of highly faceted reduced graphene oxide-coated copper oxide and copper nanoparticles on a copper foil surface

• Rebeca Ortega-Amaya,
• Yasuhiro Matsumoto,
• Andrés M. Espinoza-Rivas,
• Manuel A. Pérez-Guzmán and
• Mauricio Ortega-López

Beilstein J. Nanotechnol. 2016, 7, 1010–1017, doi:10.3762/bjnano.7.93

• or metal oxide nanoparticles [11]. In particular, rGO–Cu core–shell nanostructures have been synthesized by CVD [12][13], hydrothermal synthesis [14] and pyrolysis of an organocopper compound [15][16][17]. In a previous work, the authors reported the effective reduction of chemically exfoliated GO

Selective photocatalytic reduction of CO₂ to methanol in CuO-loaded NaTaO₃ nanocubes in isopropanol

• Tianyu Xiang,
• Feng Xin,
• Jingshuai Chen,
• Yuwen Wang,
• Xiaohong Yin and
• Xiao Shao

Beilstein J. Nanotechnol. 2016, 7, 776–783, doi:10.3762/bjnano.7.69

• was increased to 3 mol/L and 4 mol/L, the ideal morphology of the nanocubes was disrupted and fewer nanocubes were observed. Generally, the SEM image of 2M-NaTaO3 presents the best morphology. He et al. [34] reported a hydrothermal synthesis of NaTaO3 with Ta2O5 powder and NaOH followed a dissolution

Paramagnetism of cobalt-doped ZnO nanoparticles obtained by microwave solvothermal synthesis

• Jacek Wojnarowicz,
• Sylwia Kusnieruk,
• Tadeusz Chudoba,
• Stanislaw Gierlotka,
• Witold Lojkowski,
• Wojciech Knoff,
• Malgorzata I. Lukasiewicz,
• Bartlomiej S. Witkowski,
• Anna Wolska,
• Marcin T. Klepka,
• Tomasz Story and
• Marek Godlewski

Beilstein J. Nanotechnol. 2015, 6, 1957–1969, doi:10.3762/bjnano.6.200

• suitable for practical application as a spintronic material. Microwave activation of hydrothermal synthesis used to obtain nano-sized powders has been reported in a number of papers [51][52][53][54][55][56][57]. Microwave ovens were already vastly adopted in the 1980s for the synthesis of organic compounds

• surface) with a narrow grain size distribution. It has been proved that many reactions based on hydrothermal synthesis can be carried out with high efficiency and low energy consumption [67]. Doped nanoparticles can be produced using these methods as well [67]. Thus, we expected that fully reacted, Co:ZnO

Size-dependent density of zirconia nanoparticles

• Agnieszka Opalinska,
• Iwona Malka,
• Wojciech Dzwolak,
• Tadeusz Chudoba,
• Adam Presz and
• Witold Lojkowski

Beilstein J. Nanotechnol. 2015, 6, 27–35, doi:10.3762/bjnano.6.4

• effect of the surface layer on the NP density becomes particularly evident for NPs smaller than 50 nm, and thus, the density of nanoparticles is size dependent. Keywords: density; hydrothermal synthesis; hydroxy groups; nanometrology; nanopowders; zirconia; Introduction Zirconium oxide (ZrO2) has a

• up to 1100 °C and transforms to t-ZrO2, which exists in the temperature range 1100–2370 °C, while the cubic phase is found above 2370 °C [21]. However, for nanocrystalline powders, the tetragonal phase can be obtained directly during hydrothermal synthesis. It was previously observed that density

• , specific surface area, and phase composition of nano-ZrO2 depends on the hydrothermal synthesis conditions. An increase of the synthesis temperature above 260 °C leads to an increase in the nano-ZrO2 density. It should be noted that in this case the density was always less than that of bulk ZrO2 [22]. The

Template-directed synthesis and characterization of microstructured ceramic Ce/ZrO₂@SiO₂ composite tubes

• Jörg J. Schneider and
• Meike Naumann

Beilstein J. Nanotechnol. 2014, 5, 1152–1159, doi:10.3762/bjnano.5.126

• -precipitation for the preparation of powders [13], impregnation [9], dip-coating [5], or hydrothermal synthesis [4], sol–gel synthesis routes have been widely employed for the preparation of CexZr1−xO2 solid solutions [14]. Pure aqueous sols or sols stabilized by the addition of organics, e.g., surfactants

One-step synthesis of high quality kesterite Cu₂ZnSnS₄ nanocrystals – a hydrothermal approach

• Vincent Tiing Tiong,
• John Bell and
• Hongxia Wang

Beilstein J. Nanotechnol. 2014, 5, 438–446, doi:10.3762/bjnano.5.51

• the formation of pure kesterite CZTS nanocrystals. The roles of TGA in the hydrothermal synthesis are discussed. Experimental Materials: All the materials were provided by Sigma Aldrich unless otherwise stated. Chemicals of copper(II) chloride dehydrate (CuCl2·2H2O), zinc chloride (ZnCl2) product of

• . Influence of TGA concentration TGA has been widely used in hydrothermal synthesis of metal sulfide such as ZnS, SnS etc. It has been reported that the content of TGA influences the morphology of the hydrothermal product [23][24]. The effect of the content of TGA on the formation of CZTS compound was

Template-assisted formation of microsized nanocrystalline CeO₂ tubes and their catalytic performance in the carboxylation of methanol

• Jörg J. Schneider,
• Meike Naumann,
• Christian Schäfer,
• Armin Brandner,
• Heiko J. Hofmann and
• Peter Claus

Beilstein J. Nanotechnol. 2011, 2, 776–784, doi:10.3762/bjnano.2.86

• polymer-templating method was investigated in an effort to reduce such agglomeration [1][7][8][9][10][11]. Nanosized ceria can be synthesized by methods such as chemical vapour deposition (CVD), spray pyrolysis, hydrothermal synthesis or electrosynthesis [1][2][9]. These approaches lead to particulate