pH-Controlled fluorescence switching in water-dispersed polymer brushes grafted to modified boron nitride nanotubes for cellular imaging

• Saban Kalay,
• Yurij Stetsyshyn,
• Volodymyr Donchak,
• Khrystyna Harhay,
• Ostap Lishchynskyi,
• Halyna Ohar,
• Yuriy Panchenko,
• Stanislav Voronov and
• Mustafa Çulha

Beilstein J. Nanotechnol. 2019, 10, 2428–2439, doi:10.3762/bjnano.10.233

• polymer brushes via polymerization initiated from their surface [12][28]. In particular, BNNTs were covalently modified with hydrophobic polystyrene or poly(glycidyl methacrylate) polymer brushes [28]. The modified nanotubes demonstrated high dispersibility in a large number of organic solvents. In our

• aggregation of poly(acrylic acid) due to hydrophobic interactions was shown [54]. At neutral or basic pH, the hydrodynamic diameter of the poly(acrylic acid) macromolecules was significantly decreased, indicating the disruption of intermolecular aggregates [54]. Cellular imaging using P(AA-co-FA

Coating of upconversion nanoparticles with silica nanoshells of 5–250 nm thickness

• Cynthia Kembuan,
• Maysoon Saleh,
• Bastian Rühle,
• Ute Resch-Genger and
• Christina Graf

Beilstein J. Nanotechnol. 2019, 10, 2410–2421, doi:10.3762/bjnano.10.231

• quantum yields are typically prepared in organic solvents at high temperatures using hydrophobic capping agents such as oleic acid [16][17]. Life sciences applications of these NPs require to render them water-dispersible using either ligand exchange or encapsulation procedures [2][13][18][19]. This can

• be similarly necessary for applications in plasmonics or chemical sensing [20][21]. One of the most versatile ways to protect the surface of NP, making hydrophobic particle surfaces hydrophilic and simultaneously providing functional groups for subsequent covalent attachment of, e.g., biomolecules

• monodisperse particles with just one UCNP core in the center coated by a thick silica shell are obtained. This method should also be suitable for other NPs with hydrophobic surfaces dispersed in an apolar solvent independent of their chemical composition. Results and Discussion The core particles used in this

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

• of operation/storage. The weak interaction of the toluene molecule with the surface of both functionalised and non-functionalised sensors can be explained by the hydrophobic–hydrophobic interaction between the functional groups of the monolayer (CH3 groups) and the CH3 group of the toluene molecule

• -mercaptohexadecanoic acid (MHDA) showed no response to aromatic vapours [22]. As presented in Table 1, the vapours tested are nonpolar in nature and therefore have a high affinity with the hydrophobic CH3 group of the HDT. On the contrary, MHDA molecules are carboxylic acid terminated thiols, which are hydrophilic

• 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

• elucidated by incorporation kinetics and location studies. They revealed that the drug was quickly incorporated and located in the hydrophobic portion of nanometer-sized polymeric micelles. Moreover, the systems displayed plastic behavior with rheopexy characteristics at 37 °C, viscoelastic properties and a

• increase of temperature can promote the self-assembly from unimers to micelles, with large endothermic heat. In this sense, PPO-groups dehydrate in a hydrophobic core with a surrounding hydrated shell. Higher concentrations of P407 are used (15% to 20%, w/w) as colloidal gelling systems in a cubic

• hexagonal core with ordered structure, which enable the solubilization of hydrophilic and hydrophobic drugs [4][5][6][7][8][9]. Moreover, C974P is an acrylic-acid derivative, highly cross-linked, hydrophilic, and displays mucoadhesive properties [1]. In this sense, an increase in temperature promotes the

Mannosylated brush copolymers based on poly(ethylene glycol) and poly(ε-caprolactone) as multivalent lectin-binding nanomaterials

• Stefania Ordanini,
• Wanda Celentano,
• Anna Bernardi and
• Francesco Cellesi

Beilstein J. Nanotechnol. 2019, 10, 2192–2206, doi:10.3762/bjnano.10.212

• aggregates (e.g., micelles and vesicles) above their critical aggregation concentration (CAC). The resulting self-assembled nanoparticles can act as drug carriers and delivery systems, being able to accommodate a hydrophobic drug within their hydrophobic core [22], or chemically bind bioactive agents [23][24

• tendency may be due to the presence of the mannose residues that, being connected to the hydrophobic PCL chains, could affect the self-assembly of the macromolecules and generate some aggregates. Remarkably, four-arm species had a slightly lower Dh than the corresponding linear species. Turbidity assay The

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

• fluorinated chains are reinforced by very effective hydrophobic repulsion caused by the proximity of the water phase. Figure 5 depicts the inverse of the characteristic adsorption time (1/τ) as a function of the Fe concentration of the dendronized IONPs. The 1/τ values increase with increasing Fe

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

• small and sharp splinter of a smashed sapphire bulk crystal was used as a tip. Sapphire is a very hard material, it is hydrophobic with a contact angle to water above 80°[20], and it is chemically inert [21]. The high hardness allows us to create large artificial defects in our sample (as described

Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules

• William W. Bryan,
• Riddhiman Medhi,
• Maria D. Marquez,
• Supparesk Rittikulsittichai,
• Michael Tran and
• T. Randall Lee

Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194

• by the lower critical solution temperature (LCST); that is, the temperature at which the hydrogel polymers become hydrophilic and soluble in aqueous solutions, or conversely, hydrophobic and insoluble in aqueous solutions [57][58][59]. Interestingly, through chemical modification, the LCST can be

• to the collapse of the hydrogel polymer due to increased hydrophobic interactions in the polymer hydrogel network [58]. Ionizable groups such as AAc and AAm are grafted into the polymer backbone to increase electrostatic interactions. The introduction of AAc, which has ionizable COOH groups, induces

High-tolerance crystalline hydrogels formed from self-assembling cyclic dipeptide

• Yongcai You,
• Ruirui Xing,
• Qianli Zou,
• Feng Shi and
• Xuehai Yan

Beilstein J. Nanotechnol. 2019, 10, 1894–1901, doi:10.3762/bjnano.10.184

• , which provide a substantial tendency for self-assembly and the formation of gels. In addition, other weak forces, such as π–π stacking, hydrophobic effect, electrostatic interactions, and van der Waals forces, are also serviceable in driving molecular self-assembly of CDPs toward the formation of gels

• ) (Figure 2A). Thioflavin T (ThT) and nile red (NR), two specific dyes for hydrophobic domains and beta-sheet secondary structures, respectively, were used to obtain insights into the detailed interior structure of the hydrogel [49]. CLSM results confirmed that the C-WY hydrogel contains both hydrophobic

• crystal pattern. (A) CLSM images of the C-WY hydrogel in light field. NR was used to indicate the formation of hydrophobic domains (red color, B) and ThT was used to indicate the beta-sheet secondary structures (blue color, C). (D) XRD pattern of the hydrogel. (E) POM images in cross-polarized light mode

Engineered superparamagnetic iron oxide nanoparticles (SPIONs) for dual-modality imaging of intracranial glioblastoma via EGFRvIII targeting

• Xianping Liu,
• Chengjuan Du,
• Haichun Li,
• Ting Jiang,
• Zimiao Luo,
• Zhiqing Pang,
• Daoying Geng and
• Jun Zhang

Beilstein J. Nanotechnol. 2019, 10, 1860–1872, doi:10.3762/bjnano.10.181

• -Cy7.5 material was then subsequently coated onto the hydrophobic SPIONs to make them hydrophilic and more stable for further fluorescent imaging experiments. Finally, PEPHC1, a small peptide that can specifically bind with the marker EGFRvIII that is overexpressed in glioblastoma, was grafted with the

Processing nanoporous organic polymers in liquid amines

• Jeehye Byun,
• Damien Thirion and
• Cafer T. Yavuz

Beilstein J. Nanotechnol. 2019, 10, 1844–1850, doi:10.3762/bjnano.10.179

• the hydrophobic nanoporous polymer at high temperature [27]. The COP-100-Film was formed much slower when the temperature was below 80 °C, supporting that the amide formation by the condensation reaction was crucial for processing the nanoporous polymer. The quick amide formation made the COP-100

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

• molecules are encapsulated in the aqueous compartment, while hydrophobic molecules are embedded in the membrane [16]. The EE of hydrophobic molecules is majorly affected by the lamellarity of the niosome membranes. Because the niosomes discussed here are unilamellar, the main factor that seems to affect the

• concentration of chol and the non-ionic surfactant in the final niosome formulations. The presence of chol is a key factor that controls membrane rigidity. Higher chol concentrations results in a less permeable and more rigid bilayer membrane. Moreover, the encapsulation of hydrophobic molecules is highly

• dependent on the bilayer membrane fluidity where higher encapsulation values can be achieved with less rigid membranes [17]. In addition, higher chol concentrations might compete with the hydrophobic molecules and prevent its encapsulation during the self-assemble of the lipid components into the bilayer

Biocatalytic oligomerization-induced self-assembly of crystalline cellulose oligomers into nanoribbon networks assisted by organic solvents

• Yuuki Hata,
• Yuka Fukaya,
• Toshiki Sawada,
• Masahito Nishiura and
• Takeshi Serizawa

Beilstein J. Nanotechnol. 2019, 10, 1778–1788, doi:10.3762/bjnano.10.173

• were similar in shape to lamellar crystals of cellulose oligomers [42][52][53][54]. According to our examination, the cross-linking of the nanoribbons was apparently based on their physical contact, possibly through the hydrophobic effect and hydrogen bonding. We previously demonstrated nanoribbon

The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98

• Simon Krause,
• Volodymyr Bon,
• Hongchu Du,
• Rafal E. Dunin-Borkowski,
• Ulrich Stoeck,
• Irena Senkovska and
• Stefan Kaskel

Beilstein J. Nanotechnol. 2019, 10, 1737–1744, doi:10.3762/bjnano.10.169

• around a relative pressure of 0.5, indicating increased adsorption ability. In contrast to other Zr-based MOFs [38], this is a rather high relative pressure for water adsorption, indicating a hydrophobic character of the pore inner surface. In DUT-98(3), a steep increase in water adsorption is observed

Chiral nanostructures self-assembled from nitrocinnamic amide amphiphiles: substituent and solvent effects

• Hejin Jiang,
• Huahua Fan,
• Yuqian Jiang,
• Li Zhang and
• Minghua Liu

Beilstein J. Nanotechnol. 2019, 10, 1608–1617, doi:10.3762/bjnano.10.156

• feature of these building blocks is that chiral centers are contained. The synergy between various noncovalent interactions, including hydrogen bonding [21][22], π–π stacking [23][24], and hydrophobic interactions [25][26] provided by other moieties in self-assembly units, cause the chiral information to

Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications

• Pei Wang,
• Katarzyna Kulp and
• Michael Bron

Beilstein J. Nanotechnol. 2019, 10, 1475–1487, doi:10.3762/bjnano.10.146

• should be mentioned that N-CNT/N-CNT/GC displays no redox peak attributed to oxygen-containing functional groups since Fe was electrochemically leached out in H2SO4 and not chemically in concentrated HNO3 for the sake of follow-up studies not presented here. Additionally, CNT/CNT/GC is hydrophobic, while

• CNT growth was investigated, where gas flow rates were adjusted by mass flow controllers (Bronkhorst High-Tech, Germany). Prior to CVD, the Fe catalysts were conditioned at 750 °C for 30 min in a H2/Ar gas mixture. After the CNT growth, the surface of CNT/GC is highly hydrophobic. To remove remaining

Multicomponent bionanocomposites based on clay nanoarchitectures for electrochemical devices

• Giulia Lo Dico,
• Bernd Wicklein,
• Lorenzo Lisuzzo,
• Giuseppe Lazzara,
• Pilar Aranda and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2019, 10, 1303–1315, doi:10.3762/bjnano.10.129

• ) develops highly stable and viscous suspensions after sonomechanical treatment in water. Dispersions of disaggregated sepiolite can efficiently suspend nanoparticles of different topologies and hydrophobic nature such as graphene nanoplatelets (GNPs) and multiwalled carbon nanotubes (MWCNTs) in water [25

Enhanced inhibition of influenza virus infection by peptide–noble-metal nanoparticle conjugates

• Zaid K. Alghrair,
• David G. Fernig and
• Bahram Ebrahimi

Beilstein J. Nanotechnol. 2019, 10, 1038–1047, doi:10.3762/bjnano.10.104

• , including H1N1, H3N2 and H5N1 [15] can be successfully incorporated into the ligand shell of gold and silver nanoparticles. The FluPep-functionalised nanoparticles have a greater antiviral activity than the free peptide. The FluPep amino acid sequence is hydrophobic and its solubilisation requires dimethyl

Tailoring the stability/aggregation of one-dimensional TiO₂(B)/titanate nanowires using surfactants

• Atiđa Selmani,
• Johannes Lützenkirchen,
• Kristina Kučanda,
• Dario Dabić,
• Engelbert Redel,
• Ida Delač Marion,
• Damir Kralj,
• Darija Domazet Jurašin and
• Maja Dutour Sikirić

Beilstein J. Nanotechnol. 2019, 10, 1024–1037, doi:10.3762/bjnano.10.103

• hydrophobic interactions. As expected, the interaction of TNWs with 12-2-12 was stronger than with DTAB, due to the presence of two positively charged head groups and two hydrophobic tails. As a consequence of the higher adsorption of 12-2-12, TNWs remained stable in both media, while DTAB showed an opposite

• research and industrial applications. Gemini surfactants possess a unique molecular structure involving two hydrophobic moieties connected by a hydrophobic or hydrophilic spacer at the level of the head groups. Consequently, these surfactants display superior physicochemical properties and distinctly

• gemini surfactants enables the effect of molecular and micellar structure to be determined while keeping surfactant chemistry the same [36]. It can be expected that surfactant adsorption on TNWs influences TNW stability by affecting the balance between the electrostatic, hydrophobic and steric

Serum type and concentration both affect the protein-corona composition of PLGA nanoparticles

• Katrin Partikel,
• Robin Korte,
• Dennis Mulac,
• Hans-Ulrich Humpf and
• Klaus Langer

Beilstein J. Nanotechnol. 2019, 10, 1002–1015, doi:10.3762/bjnano.10.101

• attracted to NPs composed of hydrophobic core materials [30][31] resulting in a prolonged circulation time in blood [18]. Moreover, covalent attachment of apolipoprotein A–I and apolipoprotein E to the NP surface enables drug transport across the blood–brain barrier [32]. Here, both proteins were identified

• human liver cancer cell line HepG2 was used for in vitro incubation experiments. For an easy tracking of NPs in cell culture experiments, the fluorescent dye Lumogen® Red was incorporated into the hydrophobic particle matrix. Due to the lipophilic properties of the dye molecule an average of 8.14 µg

Direct growth of few-layer graphene on AlN-based resonators for high-sensitivity gravimetric biosensors

• Jimena Olivares,
• Teona Mirea,
• Lorena Gordillo-Dagallier,
• Bruno Marco,
• José Miguel Escolano,
• Marta Clement and
• Enrique Iborra

Beilstein J. Nanotechnol. 2019, 10, 975–984, doi:10.3762/bjnano.10.98

• functionalization protocol is based on the non-covalent bonding of streptavidin on hydrophobic graphene surfaces. The two protocols end with the effective bonding of biotinylated anti-IgG antibodies to the streptavidin, which leaves the surface of the devices ready for possible IgG detection. Keywords: biomolecule

• functionalization platforms. On one hand, graphene containing defects (COOH groups) can be covalently functionalized by using an EDC/NHS zero-cross linker, which allows for the binding of primary amines present in proteins and antibodies [11][12]. On the other hand, defect-free graphene is highly hydrophobic, and

• graphene with better quality. The hydrophobic character of the surface was confirmed by dropping water on it with a pipette, which revealed the lack of liquid adhesion to the surface. We also analysed the influence of the process parameters (pressure, Ar/C2H2 flow ratio and cooling rate) on the defect

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

• advanced nanomaterials has led to the development of effective drug delivery systems [1][2]. Graphene, a single layer of carbon atoms with a hexagonal 2-dimensional crystal structure, its use in nanoscience and nanotechnology, is of great interest for scientists. The hydrophobic nature of graphene

Rapid, ultraviolet-induced, reversibly switchable wettability of superhydrophobic/superhydrophilic surfaces

• Yunlu Pan,
• Wenting Kong,
• Bharat Bhushan and
• Xuezeng Zhao

Beilstein J. Nanotechnol. 2019, 10, 866–873, doi:10.3762/bjnano.10.87

• . [22] modified TiO2 with 7-[4-(trifluoromethoxyphenylazo)phenoxy]pentanoic acid (CF3AZO) which could reversibly switch between hydrophobic (≈145°) and hydrophilic (≈24°) under UV illumination for about 13 h. Chagas et al. [23] fabricated surfaces that were reversibly wettable by dipping polypropylene

• )phenoxy)undecanoic acid (AzoC11) acid to fabricate a hybrid surface which could achieve a rapid change in wettability properties within 12 min, however the wettability range was only between hydrophobic (≈146°) and hydrophilic (≈21°). Qing et al. [30] fabricated superhydrophobic TiO2 nanoparticles with

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

• reversible transition of graphene surface water droplets from hydrophobic to hydrophilic was studied at a shutdown voltage [24]. Nbelayim et al. [25] achieved the reversible transformation of graphene from hydrophobic to hydrophilic driven by a direct-current voltage. Cui et al. [26] tested droplets of

• Materials and instrumentation Alcohol (99.7%, AR) and hydrophobic silica (16–25 nm diameter) was provided by Evonik Degussa Co. Ltd. (Germany). The varnish (Voep-1) was from Shijiazhuang Paint Company. All reagents were used as received without further purification. A high-voltage power supply (Tianjin

• interfacial charges will change the wettability from hydrophobic to very hydrophilic [19][20][21][22][23][24][25][26][27]. We thought that the charges injected and accumulated on the solid surface by a direct-current electric field may also change the surface wettability. For example, the charges that were

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

• diameter of 4 ± 1 nm as determined by TEM imaging, with a sample size of at least 100 particles in each case. The obtained nanorods are capped with tightly bound phosphonic acid ligands bearing long hydrophobic alkyl chains. Rather than exchanging these ligands to allow these nanorods to be dispersed in

• polar media, platinum nanoparticles were deposited onto these CdSe@CdS nanorods in hydrophobic media based on the photochemical process reported by Alivisatos and coworkers [30], with the liquid component consisting of either toluene/triethylamine or [bmim][Tf2N] (Scheme 1). We chose [bmim][Tf2N] as the