An investigation on the drag reduction performance of bioinspired pipeline surfaces with transverse microgrooves

• Weili Liu,
• Hongjian Ni,
• Peng Wang and
• Yi Zhou

Beilstein J. Nanotechnol. 2020, 11, 24–40, doi:10.3762/bjnano.11.3

• surface. In this case, the hydrophobicity of the pipeline surface was improved by the transverse microgrooves. The better the hydrophobicity of the surface was, the lower the adhesion of water was. Therefore, the increased contact angle of the bionic pipeline was beneficial for reducing the drag

• pressure loss in fluid transport by bionic pipelines. (5) The drag reduction mechanism was mainly attributed to the vortex ‘cushioning’ and ‘driving’ effects, which were produced by low-speed vortexes in the microgrooves. In addition, the hydrophobicity of the pipeline surface was improved by the

Advanced hybrid nanomaterials

• Andreas Taubert,
• Fabrice Leroux,
• Pierre Rabu and
• Verónica de Zea Bermudez

Beilstein J. Nanotechnol. 2019, 10, 2563–2567, doi:10.3762/bjnano.10.247

• hydrophobicity and lipophilicity. Exfoliated nanosheets of layered calcium phenylphosphonate assisted by solvent were used in “Layered calcium phenylphosphonate: a hybrid material for a new generation of nanofillers” to promote the mechanical properties and improve the barrier effect for applications such as

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

• ) hydrolysis [8][9], 2) oxidation, and 3) dehydrohalogenation [10][11][12] (Scheme 1). The hydrolysis route is limited to small scales because of the hydrophobicity of sulfur mustard gas. The mechanism of degradation by dehydrohalogenation mechanism is still poorly understood and not efficient enough for real

Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation

• Nadra Bohli,
• Meryem Belkilani,
• Juan Casanova-Chafer,
• Eduard Llobet and
• Adnane Abdelghani

Beilstein J. Nanotechnol. 2019, 10, 2364–2373, doi:10.3762/bjnano.10.227

• the sensor response was studied in a previous work [32]. The response to vapours remains basically unchanged for sensors employing hydrophobic thiols due to their hydrophobicity [31]. Such long-chain alkanethiol functionalised and decorated MWCNTs showed a high contact angle with water, which remains

Design of a nanostructured mucoadhesive system containing curcumin for buccal application: from physicochemical to biological aspects

• Sabrina Barbosa de Souza Ferreira,
• Gustavo Braga,
• Évelin Lemos Oliveira,
• Jéssica Bassi da Silva,
• Hélen Cássia Rosseto,
• Lidiane Vizioli de Castro Hoshino,
• Mauro Luciano Baesso,
• Wilker Caetano,
• Craig Murdoch,
• Helen Elizabeth Colley and
• Marcos Luciano Bruschi

Beilstein J. Nanotechnol. 2019, 10, 2304–2328, doi:10.3762/bjnano.10.222

• the structuring of the micelles to promote a steric hindrance as well as higher emission intensity that promotes increased hydrophobicity of PPO blocks with higher affinity with CUR. CUR localization by fluorescence quenching The localization of CUR in the polymeric systems was performed by

Microbubbles decorated with dendronized magnetic nanoparticles for biomedical imaging: effective stabilization via fluorous interactions

• Da Shi,
• Justine Wallyn,
• Dinh-Vu Nguyen,
• Francis Perton,
• Delphine Felder-Flesch,
• Sylvie Bégin-Colin,
• Mounir Maaloum and
• Marie Pierre Krafft

Beilstein J. Nanotechnol. 2019, 10, 2103–2115, doi:10.3762/bjnano.10.205

• , which contributes to a further increase of the hydrodynamic radius. The mean diameter of the IONP@C4X9OEG8Den materials was larger, namely ≈95 nm and ≈200 nm for X = H and F, respectively, revealing that aggregation occurs in aqueous media due to the hydrophobicity of the end group. Fortunately, this

• tension σ over time are collected in Figure 3 and Table 1. The results show that, not surprisingly, σ decreases with increasing Fe concentration in all cases. The lowest σ values were obtained for the IONPs grafted with the fluorinated dendrons, reflecting their higher hydrophobicity. We also observed

Ion mobility and material transport on KBr in air as a function of the relative humidity

• Dominik J. Kirpal,
• Korbinian Pürckhauer,
• Alfred J. Weymouth and
• Franz J. Giessibl

Beilstein J. Nanotechnol. 2019, 10, 2084–2093, doi:10.3762/bjnano.10.203

• water layers depends on many factors including the relative humidity, surface roughness, hydrophilicity or hydrophobicity, meniscus formation (as described later) and also air pressure and temperature [2]. In the case of freshly cleaved or dried surfaces the amount of adsorbed water also relates to the

• later) without damaging the tip. Moreover, the hydrophobicity reduces capillary formation at the tip–sample contact area. Capillary condensation causes a locally enhanced presence of condensed water molecules [22], which might correspond to a much higher relative humidity near the apex. Furthermore, the

• water film and the water meniscus that forms around the tip–sample contact cause damping forces on the probe, which result in higher noise [7]. The hydrophobicity of sapphire reduces the meniscus effect. The impact that hydrophobicity or hydrophilicity of the tip material can have is demonstrated by

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

• solely from the rapid Xe exchange between micro- and mesopores highly interconnected to each other. An alternative explanation that the appearance of mesopores with multiple surface hydroxyl groups are not accessible for Xe due to too low hydrophobicity seems to be improbable. A similar observation is

• titanosilicate it was expected that the too small pores prohibit accommodation of triolein molecules. For P-ETS-10/60 this might result from the decreased surface hydrophobicity (as seen by the 29Si NMR and indirectly by the NH3-TPD), preventing efficient diffusion into the mesopores of the crystals. The

• surface area of the catalysts; for P-ETS-10, it led to the lower activity compared to the microporous Na,K-ETS-10. The maximum conversion of 57% was reached only after 20 h of reaction. This observation, being counterintuitive at a first glance, can be explained by the reduced hydrophobicity of the

Microfluidic manufacturing of different niosomes nanoparticles for curcumin encapsulation: Physical characteristics, encapsulation efficacy, and drug release

• Mohammad A. Obeid,
• Ibrahim Khadra,
• Abdullah Albaloushi,
• Margaret Mullin,
• Hanin Alyamani and
• Valerie A. Ferro

Beilstein J. Nanotechnol. 2019, 10, 1826–1832, doi:10.3762/bjnano.10.177

• cancer such as prostate and cervical cancers [3]. However, the therapeutic application of curcumin is limited by its high hydrophobicity with poor water solubility, photosensitivity, chemical instability, and rapid metabolism rate [4][5]. Therefore, as a result, systemic bioavailability is much reduced

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

• dispersion and to increase the performance of the catalyst for the ORR due to the structural and electronic properties of the doped CNT [34][35]. Additionally, the amount of heteroatom in the doped structure has an effect on the hydrophobicity of the material, which could provide a solution to facilitate the

• performance and durability of PEM fuel cells [44][45]. These materials should combine some key characteristics such as: i) an adapted surface chemistry to allow high dispersion of the metallic phase at very high metal loading, ii) a good balance between hydrophobicity and hydrophilicity to allow water

Novel reversibly switchable wettability of superhydrophobic–superhydrophilic surfaces induced by charge injection and heating

• Xiangdong Ye,
• Junwen Hou and
• Dongbao Cai

Beilstein J. Nanotechnol. 2019, 10, 840–847, doi:10.3762/bjnano.10.84

• the temperature to 25–60 °C. Hou et al. [15] studied the influence of drying temperature on the hydrophobicity of PS/TiO2. By increasing the drying temperature from 20 °C to 180 °C, the static contact angle of the coating changed from 0 ± 2° to 158 ± 2°. Yu et al. [16] prepared a surface with pH

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

• Michael D. Ballentine,
• Elizabeth G. Embry,
• Marco A. Garcia and
• Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

• ionic liquid due to its facile synthesis and the hydrophobicity imparted by the fluorinated anion. For metal deposition in organic media (tol-NR, Figure 1a), CdSe@CdS nanorods were dispersed in toluene containing triethylamine and Pt(acac)2 followed by irradiation using a xenon arc lamp. For metal

Ultrathin hydrophobic films based on the metal organic framework UiO-66-COOH(Zr)

• Miguel A. Andrés,
• Clemence Sicard,
• Christian Serre,
• Olivier Roubeau and
• Ignacio Gascón

Beilstein J. Nanotechnol. 2019, 10, 654–665, doi:10.3762/bjnano.10.65

• increases the hydrophobicity of highly hydrophilic substrates. Experimental MOF synthesis and characterization UiO-66-COOH(Zr) was synthesized following a previously reported protocol with slightly modified conditions [31]. 1,2,4-Benzenetricarboxylic acid (BTC) (2.2 g, 10 mmol) from Alfa Aesar (98%) was

Topochemical engineering of composite hybrid fibers using layered double hydroxides and abietic acid

• Liji Sobhana,
• Lokesh Kesavan,
• Jan Gustafsson and
• Pedro Fardim

Beilstein J. Nanotechnol. 2019, 10, 589–605, doi:10.3762/bjnano.10.60

• purity, bonding, and morphology. These fibers further were tested for water contact angle (hydrophobicity), oil absorption (lipophilicity), tensile strength and ISO brightness measurements. The performance of C-HF was compared with unmodified reference fibers (REF), fibers composed with only AA (C-F) and

• hydrophobicity was carried out by anchoring a hydrophobic moiety, namely stearic acid (SA), on wood pulp via a bridging LDH molecule. This led a new hybrid organic–inorganic–organic composite (SA-LDH-CEL) [15]. There are two different methods to make cellulose hydrophobic: (1) chemical methods such as

• hydrophobic molecules on pulp was carefully controlled as the adhesion was steered by self-directed –COOH…OH hydrogen bonding. This SA-LDH-CEL hybrid material offered super-hydrophobicity. We have decided to extend this research using another environmentally friendly natural fatty acid, namely abietic acid

Biomimetic synthesis of Ag-coated glasswing butterfly arrays as ultra-sensitive SERS substrates for efficient trace detection of pesticides

• Guochao Shi,
• Mingli Wang,
• Yanying Zhu,
• Yuhong Wang,
• Xiaoya Yan,
• Xin Sun,
• Haijun Xu and
• Wanli Ma

Beilstein J. Nanotechnol. 2019, 10, 578–588, doi:10.3762/bjnano.10.59

• . However, these chemical methods cannot avoid aggregation phenomena, which is a major drawback. Recent years have witnessed a very high level of research interest in well-defined biomimetic compounds. Because the micro/nanomaterials in nature usually possess intrinsic hydrophobicity and high adhesion

• ± 20 nm. The rough nanostructures including the crisscrossing nanoplates are regarded as the origin of hydrophobicity. As shown in Figure 2b–f, Ag nanofilms were deposited on the surface of the G.b. wings and 3D plasmonic nanostructures with high EM were successfully fabricated. It can be clearly

Hydrophilicity and carbon chain length effects on the gas sensing properties of chemoresistive, self-assembled monolayer carbon nanotube sensors

• Juan Casanova-Cháfer,
• Carla Bittencourt and
• Eduard Llobet

Beilstein J. Nanotechnol. 2019, 10, 565–577, doi:10.3762/bjnano.10.58

• response and selectivity. This would make the detection of polar and nonpolar gas species employing low-power gas sensors easier, even under fluctuating ambient moisture conditions. Keywords: carbon length chain; gas sensing mechanism; hydrophilicity; hydrophobicity; multiwall carbon nanotubes (MWCNTs

• the gold nanoparticles creating SAMs (see Figure S2, Supporting Information File 1), which differed in their terminal functional groups and in the length of their carbon chain. This enables studying the effects of hydrophilicity or hydrophobicity of terminal functional groups and carbon chain length

• 16 carbons) and in the head group (either carboxylic acid or methyl). This has enabled the study of the effects of hydrophilicity or hydrophobicity of terminal functional groups and carbon chain length on the gas sensing properties of SAMs supported on CNTs. Under this approach, thiols should, in

Nanocomposite–parylene C thin films with high dielectric constant and low losses for future organic electronic devices

• Marwa Mokni,
• Gianluigi Maggioni,
• Abdelkader Kahouli,
• Sara M. Carturan,
• Walter Raniero and
• Alain Sylvestre

Beilstein J. Nanotechnol. 2019, 10, 428–441, doi:10.3762/bjnano.10.42

• ][22]. Parylene C is highly corrosion resistant on metallic surfaces and possesses outstanding electrical insulation with high tensile strength, moderate dielectric losses [16][23] and low permeability to gases [24][25]. Hydrophobicity [26] and physical stability [27] of parylene C make it a good

Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability

• Camilo Florian Baron,
• Alexandros Mimidis,
• Daniel Puerto,
• Evangelos Skoulas,
• Emmanuel Stratakis,
• Javier Solis and
• Jan Siegel

Beilstein J. Nanotechnol. 2018, 9, 2802–2812, doi:10.3762/bjnano.9.262

• surface structures; laser rescanning; steel; wettability; Introduction Complex structures found in nature often present properties that are attractive for applications in science and technology. The hydrophobicity found at the lotus leaf surface [1], the exceptional adhesion capability of gecko feet [2

• delivered in an area. Supporting Information Supporting Information File 192: Wettability test of a laser-structured area, exposed to a laser fluence of 1 J/cm2, 200 rescans and a repetition rate of 500 kHz. The water droplet touches the surface several times, but never lands due to the high hydrophobicity

Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

• Naoual Allali,
• Veronika Urbanova,
• Mathieu Etienne,
• Xavier Devaux,
• Martine Mallet,
• Brigitte Vigolo,
• Jean-Joseph Adjizian,
• Chris P. Ewels,
• Sven Oberg,
• Alexander V. Soldatov,
• Edward McRae,
• Yves Fort,
• Manuel Dossot and
• Victor Mamane

Beilstein J. Nanotechnol. 2018, 9, 2750–2762, doi:10.3762/bjnano.9.257

• putting oxidative defects on their sidewalls and extremities to decrease their hydrophobicity, ii) to use non-covalent interaction with hydrophilic biomolecules or surfactants [15][16][17][18] or iii) to use covalently grafted polyethyleneglycol (PEG) linkers, as described by us [9][11][12]. Many studies

Lead-free hybrid perovskites for photovoltaics

• Oleksandr Stroyuk

Beilstein J. Nanotechnol. 2018, 9, 2209–2235, doi:10.3762/bjnano.9.207

• stable in humid air than MAGeI3 because of its high hydrophobicity of the organic component [143]. The stability of MAGeI3 HP and its performance as a light harvester of solar cells can also be enhanced by introducing bromide additives. By substituting 10% I− with Br− a PCE of 0.57% was achieved (Table 1

• not tested as a potential light harvester. A highly stable C6H4NH2CuBr2I compound was synthesized by reacting 2-iodaniline with CuBr2 [150]. It displayed extraordinary hydrophobicity and retained stability even after a 4 h immersion in water. This stability is coupled with a high sensitivity to

Nanoconjugates of a calixresorcinarene derivative with methoxy poly(ethylene glycol) fragments for drug encapsulation

• Alina M. Ermakova,
• Julia E. Morozova,
• Yana V. Shalaeva,
• Victor V. Syakaev,
• Aidar T. Gubaidullin,
• Alexandra D. Voloshina,
• Vladimir V. Zobov,
• Irek R. Nizameev,
• Olga B. Bazanova,
• Igor S. Antipin and
• Alexander I. Konovalov

Beilstein J. Nanotechnol. 2018, 9, 2057–2070, doi:10.3762/bjnano.9.195

• nanoassociates that are able to encapsulate organic substrates of different hydrophobicity, including drugs (doxorubicin, naproxen, ibuprofen, quercetin). The micelles of the macrocycle slowed down the release of the hydrophilic substrates in vitro. In physiological sodium chloride solution and phosphate

• encapsulation of hydrophobic substrates The encapsulation of model compounds of different hydrophobicity by macrocycle 3 was studied (Table 2). These compounds were doxorubicin (Dox), an anthracycline antitumor antibiotic, quercetin (QC), a flavonol that exhibits decongestant, antispasmodic, antihistaminic

• particle size of 3 is observed, which is probably related to an increased hydrophobicity of the particles. The higher drug-loading (DL) values of Orange OT lead to a stronger growth of the particles (Figure 5c, Table S1, Supporting Information File 1). The encapsulation of Dox into micelles of 3 was also

Biomimetic and biodegradable cellulose acetate scaffolds loaded with dexamethasone for bone implants

• Aikaterini-Rafailia Tsiapla,
• Varvara Karagkiozaki,
• Veroniki Bakola,
• Foteini Pappa,
• Panagiota Gkertsiou,
• Eleni Pavlidou and
• Stergios Logothetidis

Beilstein J. Nanotechnol. 2018, 9, 1986–1994, doi:10.3762/bjnano.9.189

• synthetic polymeric scaffolds exhibit controllable degradation, good mechanical properties and can be modified easily, they cannot be as bioactive as natural polymers. Moreover, due to their hydrophobicity they hinder significant cellular growth and subsequent tissue formation [14]. Therefore, cellulose

• partial esterification of cellulose with acetic acid. The esterification of hydroxy groups of cellulose increases the hydrophobicity of CA while at the same time the existence of ester bonds makes it more susceptible to degrading in aquatic environments. So, in a 5 month period the change of the scaffold

• release pattern with an initial burst on day 1, in which 11.6% of the dexamethasone was released. This is probably due to the hydrophobicity of dexamethasone. When a hydrophobic drug forms a fibrous matrix with a polymer, a low burst release is observed. The second stage is the decay of the polymeric

Atomic-level characterization and cilostazol affinity of poly(lactic acid) nanoparticles conjugated with differentially charged hydrophilic molecules

• María Francisca Matus,
• Martín Ludueña,
• Cristian Vilos,
• Iván Palomo and
• Marcelo M. Mariscal

Beilstein J. Nanotechnol. 2018, 9, 1328–1338, doi:10.3762/bjnano.9.126

• hydrophilicity/hydrophobicity ratio, the size and surface chemistry are crucial factors in NP–cell interactions. Several studies on metallic NPs, carbon nanotubes, and dendrimers have shown that toxicity of different NPs is determined by a combination of these factors [25][26][27][28][29]. In this respect

• combined computational methodology could be particularly effective in cases where potential drugs have similar hydrophobicity values to achieve a first approximation to guide the experimental phase. It could be expected that a drug with a lower degree of hydrophobicity would be more likely to migrate to

• reported when testing drugs with comparable hydrophobicity [54], which could be explained by NP–drug interactions calculated by these predictive tools. Conclusion In the present study, MD simulations provided a comprehensive understanding of the factors that contribute to PLA–PEG nanoparticle formation. To

Review on nanoparticles and nanostructured materials: history, sources, toxicity and regulations

• Jaison Jeevanandam,
• Ahmed Barhoum,
• Yen S. Chan,
• Alain Dufresne and
• Michael K. Danquah

Beilstein J. Nanotechnol. 2018, 9, 1050–1074, doi:10.3762/bjnano.9.98

• sophisticated fractal and layered cuticle patterns possess superhydrophobic properties. These structural types are composed of the hierarchical structure which may be responsible for increasing the surface hydrophobicity [194]. Moreover, the colors of butterflies are attributed to their fine wing structure

Comparative study of antibacterial properties of polystyrene films with TiO_x and Cu nanoparticles fabricated using cluster beam technique

• Vladimir N. Popok,
• Cesarino M. Jeppesen,
• Peter Fojan,
• Anna Kuzminova,
• Jan Hanuš and
• Ondřej Kylián

Beilstein J. Nanotechnol. 2018, 9, 861–869, doi:10.3762/bjnano.9.80

• viability. The survival ratio (number of live cells after 120 min with respect to that immediately after the deposition) is found to be around 0.42 for the first cycle (see Table 1). The relatively long initial time for inactivation of the bacteria can be related to the hydrophobicity of the PS surface with