Distribution of functional groups in periodic mesoporous organosilica materials studied by small-angle neutron scattering with in situ adsorption of nitrogen

• Monir Sharifi,
• Dirk Wallacher and
• Michael Wark

Beilstein J. Nanotechnol. 2012, 3, 428–437, doi:10.3762/bjnano.3.49

• the benzene rings. However, the mesoporous structure with hexagonal pore ordering is still well developed, as shown below by SANS measurements. To clarify the general influence of the preparation conditions on the pore size distribution, pure benzene-PMO materials were also treated, either with

Conducting composite materials from the biopolymer kappa-carrageenan and carbon nanotubes

• Ali Aldalbahi,
• Jin Chu,
• Peter Feng and
• Marc in het Panhuis

Beilstein J. Nanotechnol. 2012, 3, 415–427, doi:10.3762/bjnano.3.48

• , mechanical and physical characteristics are dependent on various parameters, such as the type of CNTs (SWNT or MWNT), the filtration substrate (pore size; hydrophilic or hydrophobic), the sonication time and the type of dispersant (surfactants or polymers) [9][33]. The electrical properties combined with

• obtained from Sigma Aldrich (USA, lot # 033K0097). Methanol (CH3OH, lot # 318-2.5L GL) was purchased from Ajax Finechem (Australia). Hydrophobic polytetrafluoroethylene (PTFE, pore size of 5 μm) filtration membranes were purchased from Micro Filtration Systems (USA). Milli-Q water was used in all

• -filtration method KC–CNT dispersions were processed into buckypapers by using a vacuum-filtration method. Prior to the filtration the KC–CNT dispersion was combined with 35 mL Milli-Q water and inverted to ensure complete mixing. The dispersions (50 mL) were drawn through a PTFE membrane filter (pore size

Ultraviolet photodetection of flexible ZnO nanowire sheets in polydimethylsiloxane polymer

• Jinzhang Liu,
• Nunzio Motta and
• Soonil Lee

Beilstein J. Nanotechnol. 2012, 3, 353–359, doi:10.3762/bjnano.3.41

• suspension was vacuum filtered through a porous anode aluminum oxide (AAO) membrane, diameter of 4.3 cm and pore size of 200 nm, purchased from Whatman Co. Then the network film of ZnO nanowires on an AAO membrane was dried in air at 100 °C for 1 h. Finally, the thin sheet of ZnO nanowires was detached from

Synthesis and catalytic applications of combined zeolitic/mesoporous materials

• Jarian Vernimmen,
• Vera Meynen and
• Pegie Cool

Beilstein J. Nanotechnol. 2011, 2, 785–801, doi:10.3762/bjnano.2.87

• with only minor) “true” hierarchical ordering cannot be beneficial for certain reactions. In fact, often a uniform pore size distribution and a high level of porosity are much more relevant than a perfectly ordered nanoporous material. The disordered mesoporous material, KIT-1 [53], is the perfect

Nanostructured, mesoporous Au/TiO₂ model catalysts – structure, stability and catalytic properties

• Matthias Roos,
• Dominique Böcking,
• Kwabena Offeh Gyimah,
• Gabriela Kucerova,
• Joachim Bansmann,
• Johannes Biskupek,
• Ute Kaiser,
• Nicola Hüsing and
• R. Jürgen Behm

Beilstein J. Nanotechnol. 2011, 2, 593–606, doi:10.3762/bjnano.2.63

• (BET) relation in the p/p0 range of 0.05 to 0.3 [26]. The pore size distribution was evaluated from the desorption branch of the isotherms, by the procedure developed by Barrett, Joyner and Halenda (BJH) [27]. XRD measurements were performed on a PANalytical MPD PRO instrument, with Cu Kα radiation (λ

• P123, are applied [32]. Nevertheless, a porous material was obtained, built up from anatase crystallites of 9 nm diameter (calculated from the Scherrer equation) with specific surface areas (after calcination at 350 °C) of 175 m2·g−1 and a monomodal, narrow, pore-size distribution with an average pore

• total, most of the structural properties of the mesoporous TiO2 thin films on Si(100) substrates (crystallinity, pore size) are similar to those found in the mesoporous TiO2 powder. Subsequent Au loading leads to a homogeneous distribution of the Au nanoparticles with a slightly smaller mean size, but a

Inorganic–organic hybrid materials through post-synthesis modification: Impact of the treatment with azides on the mesopore structure

• Miriam Keppeler,
• Jürgen Holzbock,
• Johanna Akbarzadeh,
• Herwig Peterlik and
• Nicola Hüsing

Beilstein J. Nanotechnol. 2011, 2, 486–498, doi:10.3762/bjnano.2.52

• Inorganic–organic hybrid materials with tailored porosity on several length scales are of interest for a variety of applications, such as separation, adsorption, catalysis, energy storage, etc., due to the benefits arising from each pore size regime, e.g., rapid mass transport through macropores combined

• with selectivity provided by meso- or micropores. This is especially true for materials with uniform pore size distributions in the mesoporous (2–50 nm) and/or macroporous regime (>50 nm) [1][2][3]. A powerful tool in the preparation of stable, mesoscopically organized materials that are characterized

• pore structure is quite well investigated [25]. In post-synthetic functionalization procedures, a porous matrix with the desired pore size, pore connectivity, surface area, etc., is prepared prior to the modification step and the organic moieties are made to react with the surface silanol groups in a

Dynamics of capillary infiltration of liquids into a highly aligned multi-walled carbon nanotube film

• Sławomir Boncel,
• Krzysztof Z. Walczak and
• Krzysztof K. K. Koziol

Beilstein J. Nanotechnol. 2011, 2, 311–317, doi:10.3762/bjnano.2.36

• ∞) established by the balance between gravitational and capillarity force: where R is the average pore size. The second factor affecting the infiltration, via the kinetics of this rise (the rate of infiltration), is expected to be the viscosity of the liquid (at the infiltration temperature). The Lucas–Washburn

• intertube separation distance calculated from the nanotube density in the HACNT film is ~310 nm, whereas an average pore size (R) derived from the H2/R ratio (20 m) is ~50 nm. This is also a reflection of the coalescence behaviour. Addition of a conventional anionic surfactant, sodium dodecylbenzene sulfate

Novel acridone-modified MCM-41 type silica: Synthesis, characterization and fluorescence tuning

• Maximilian Hemgesberg,
• Gunder Dörr,
• Yvonne Schmitt,
• Andreas Seifert,
• Zhou Zhou,
• Robin Klupp Taylor,
• Sarah Bay,
• Stefan Ernst,
• Markus Gerhards,
• Thomas J. J. Müller and
• Werner R. Thiel

Beilstein J. Nanotechnol. 2011, 2, 284–292, doi:10.3762/bjnano.2.33

• to the TEM analysis (Figure 3) and BET measurements (Figure 4), the sol–gel process yielded a well ordered mesoporous material with a total surface area of up to 810 m2·g−1, exhibiting a characteristic pore size distribution with a sharp peak around 2.4 nm. The XRD spectrum reveals the expected peak

• CHNS vario Microcube elemental analyzer (Elementar). X-ray powder diffraction (PXRD) patterns of the silica samples were recorded on a Siemens D5005 instrument using Ni-filtered Cu Kα radiation (λ = 1.5404 Å), with a step size of 1 °/min. N2-Adsorption–desorption isotherms, pore size distributions as

• , which was kept under liquid nitrogen. The average pore size of the samples was estimated using the BJH approach based on the Kelvin equation while assuming a cylindrically shaped porous structure. The specific surface areas were calculated by means of the Brunauer–Emmett–Teller (BET) equation in the low

Detection of interaction between biomineralising proteins and calcium carbonate microcrystals

• Hanna Rademaker and
• Malte Launspach

Beilstein J. Nanotechnol. 2011, 2, 222–227, doi:10.3762/bjnano.2.26

• % sodium dodecyl sulfate (SDS), 10 mM dithiothreitol (DTT), and 10 mM Tris-HCl (pH 8.0). 2.5 mL of the supernatant liquid (protein solution, P) was filtered (NALGENE syringe filters with nylon membranes, pore size: 0.2 μm) and divided into 12 parts (first one 1.0 mL, the others 0.5 mL) with a PD-10 gel

Room temperature synthesis of indium tin oxide nanotubes with high precision wall thickness by electroless deposition

• Mario Boehme,
• Emanuel Ionescu,
• Ganhua Fu and
• Wolfgang Ensinger

Beilstein J. Nanotechnol. 2011, 2, 119–126, doi:10.3762/bjnano.2.14

• nanotubes were examined by Raman spectroscopy with 633 nm laser excitation. The SEM images in Figure 1b–c show the ITO-NTs freed from the polycarbonate template. The outer diameter of the tube shown in Figure 1d is about 100 nm, which is in relation to the etched ion-track pore size of the polycarbonate

Pore structure and surface area of silica SBA-15: influence of washing and scale-up

• Jörg P. Thielemann,
• Frank Girgsdies,
• Robert Schlögl and
• Christian Hess

Beilstein J. Nanotechnol. 2011, 2, 110–118, doi:10.3762/bjnano.2.13

• of solvent used, alter the homogeneity and order of the pores, but also lead to an increase of the surface area of SBA-15. A reduction of solvent volume and a controlled washing protocol allow the synthesis of high surface area SBA-15 materials with a narrow monomodal pore size distribution. For

• larger batch sizes the influence of the quantity of solvent on the quality of the SBA-15 is reduced. Keywords: SBA-15; scale-up; silica mesoporous material; tensile strength effect; washing; Introduction SBA-15 is a mesoporous silica sieve based on uniform hexagonal pores with a narrow pore size

• volume of the solvents has an impact on the surface area and pore size distribution of SBA-15. Also the influence of scaling up to 27 g per batch on the properties of SBA-15 is discussed. Up until now the largest synthesis scale as reported by Tkachenko et al. corresponded to approximately 24.5 g [23

Microfluidic anodization of aluminum films for the fabrication of nanoporous lipid bilayer support structures

• Jaydeep Bhattacharya,
• Alexandre Kisner,
• Andreas Offenhäusser and
• Bernhard Wolfrum

Beilstein J. Nanotechnol. 2011, 2, 104–109, doi:10.3762/bjnano.2.12

• substrates can address the backside of the membrane via a direct fluidic interface. The advantage of nanoporous substrates over other membrane spanning systems using microapertures lies in the increased stability caused by the small pore size [33][34][35][36]. Nevertheless, alumina membranes themselves are

Synthesis of LiNbO₃ nanoparticles in a mesoporous matrix

• Anett Grigas and
• Stefan Kaskel

Beilstein J. Nanotechnol. 2011, 2, 28–33, doi:10.3762/bjnano.2.3

• . Elemental analyses of these materials showed that there was no silica residue after the treatment. Figure 2 shows the nitrogen physisorption isotherms of the SBA-15 and LiNbO3/SBA-15 composite (LN), and the corresponding pore size distributions of the samples. The measurements were recorded to investigate

• m2·g−1 for the SBA-15 to 130–160 m2·g−1 after impregnation with nanoparticles, as expected. The pore size distribution curves indicate identical pore sizes for both materials, and narrow pore size distributions in the range of 7.0–8.5 nm. These values are typical for the formation of particles inside

• specific surface area was calculated from the BET (Brunauer–Emmet–Teller) equation (p/p0 = 0.05–0.20). The pore volume was determined at relative pressure of p/p0 = 0.95. The pore size distribution was estimated from the desorption branch of the isotherm using Density Functional Theory (DFT). Chemical