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

• , as well as the negatively charged THPC-Au seed particles and the positively charged pDADMAC layer [88]. As such, the stable attachment of the Ag particles to the polymer in aqueous solution was demonstrated by repeated cycles of centrifuging and redispersing the particles via sonication in water

Magnetic properties of biofunctionalized iron oxide nanoparticles as magnetic resonance imaging contrast agents

• Natalia E. Gervits,
• Andrey A. Gippius,
• Alexey V. Tkachev,
• Evgeniy I. Demikhov,
• Sergey S. Starchikov,
• Igor S. Lyubutin,
• Alexander L. Vasiliev,
• Vladimir P. Chekhonin,
• Maxim A. Abakumov,
• Alevtina S. Semkina and
• Alexander G. Mazhuga

Beilstein J. Nanotechnol. 2019, 10, 1964–1972, doi:10.3762/bjnano.10.193

• MNPs were precipitated by acetone, then thoroughly washed with acetone and dried. HSA-coated MNPs were synthesized by the following procedure. First, the MNPs (80 mg) were placed in NaOH aqueous solution (30 × 10−3 M, 20 mL) and the mixture was stirred until all the precipitate was suspended. After

Synthesis and potent cytotoxic activity of a novel diosgenin derivative and its phytosomes against lung cancer cells

• Liang Xu,
• Dekang Xu,
• Ziying Li,
• Yu Gao and
• Haijun Chen

Beilstein J. Nanotechnol. 2019, 10, 1933–1942, doi:10.3762/bjnano.10.189

• ingredients could undergo self-assembly into stable vesicles in aqueous solution, which could act as a vehicle to facilitate membrane transport [29]. Compared to liposomes, phytosomes can load more drug molecules, and showed enhanced stability in the lyophilization and reconstitution processes prior to use

• be attribute to the coalescence of particles during drying. According to the literature, phytosomes will display micellar shapes in aqueous solution [37]. The spherical phytosomes may probably coagulate into rods in the drying step during TEM sample preparation. From the DLS and TEM measurements, the

Facile synthesis of carbon nanotube-supported NiO//Fe₂O₃ for all-solid-state supercapacitors

• Shengming Zhang,
• Xuhui Wang,
• Yan Li,
• Xuemei Mu,
• Yaxiong Zhang,
• Jingwei Du,
• Guo Liu,
• Xiaohui Hua,
• Yingzhuo Sheng,
• Erqing Xie and
• Zhenxing Zhang

Beilstein J. Nanotechnol. 2019, 10, 1923–1932, doi:10.3762/bjnano.10.188

• , the CC-CNT was immersed into FeCl3 (0.1 M) aqueous solution for 12 h, and then dried at 70 °C in drying oven for 2 h, and transferred into NaBH4 (0.1 M) aqueous solution for 6 h at room temperature afterwards. Finally, the obtained samples were washed by deionized water and dried in a drying oven for

• 12 h. CC-CNT@NiO: The NiO was coated on the CC-CNT by the same process with NiCl2 (0.1 M) aqueous solution instead of FeCl3 (0.1 M). Materials characterization The morphologies and microstructures of the as-prepared samples were characterized by using a field-emission scanning electron microscope (FE

• (ASAP 2020). Electrochemical characterization The half-cell electrochemical properties were tested in a standard three-electrode system at room temperature on an electrochemical work station (CHI 600E, CH Instruments, Inc., China). 2 M KOH aqueous solution was used as the electrolyte, a Pt plate as the

Lipid nanostructures for antioxidant delivery: a comparative preformulation study

• Elisabetta Esposito,
• Maddalena Sguizzato,
• Markus Drechsler,
• Paolo Mariani,
• Federica Carducci,
• Claudio Nastruzzi,
• Giuseppe Valacchi and
• Rita Cortesi

Beilstein J. Nanotechnol. 2019, 10, 1789–1801, doi:10.3762/bjnano.10.174

• nanoparticles Lipid nanoparticles were prepared by a hot homogenization technique based on ultrasound treatment. In both cases the dispersing phase was an aqueous solution of poloxamer 188 (2.5% w/w) [37]. In the case of SLN the disperse phase was constituted of one solid lipid (i.e., tristearin, precirol

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

• oligomerization-induced self-assembly assisted by organic solvents, which are widely used typical small molecules. The CDP-catalyzed oligomerization from ᴅ-glucose primers, which is known to produce rectangular nanosheets as precipitates in aqueous solution (Figure 1) [30][31], was used in this study. The

• sulfoxide (DMSO), N,N-dimethylformamide (DMF), acetonitrile (MeCN), and ethanol (EtOH), with different characteristics were used in this study. We addressed the CDP-catalyzed oligomerization from ᴅ-glucose primers, where the precipitated nanosheets are produced in aqueous solution [30][31]. The

• ). The values were calculated from both kinds of spectra to be 8–10, slightly lower than that of the oligomers synthesized in aqueous solution (i.e., 10) [31][42], depending on the organic solvent species and their concentrations (Table 1). The slight decrease in with the organic solvents was mainly

Materials nanoarchitectonics at two-dimensional liquid interfaces

• Katsuhiko Ariga,
• Michio Matsumoto,
• Taizo Mori and
• Lok Kumar Shrestha

Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153

• -dimensional iron–nickel cyanide-bridged network at the air–water interface. A small amount of the amphiphilic pentacyanoferrate complex monomer was spread from a chloroform solution to form a monolayer in a LB trough, and was subsequently connected by introducing an aqueous solution of nickel nitrate into the

• ) [228]. DHTPA was dissolved in water, and the resulted aqueous solution was layered on top of a chloroform solution of a tetra-substituted amine monomer containing porphyrin. The segregation of the monomers confined the imine formation to the interface and yielded wafer-size multilayer imine-linked COF

• monomers were treated with p-toluene sulfonic acid (PTSA) forming [amine-PTSA] salts, and dissolved into aqueous phases. Each aqueous solution was layered on a dichloromethane solution containing 1,3,5-triformylphloroglucinol (Tp), an aldehyde-derivative COF monomer, yielding large COF films of sub-100 nm

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

• -oxidation The CVs of the methanol oxidation reaction (MOR) over the Pt-containing nanostructured electrodes were recorded in N2-purged 1 M CH3OH and 0.5 M H2SO4 aqueous solution to investigate their suitability for electrocatalytic applications. Due to the large double-layer capacity of the samples, a slow

• oxygen functional groups as anchoring sites. Afterwards, Fe nanoparticles were grown on the oxidized GC by double pulse deposition [57] in 0.005 M FeSO4·7H2O (≥99.5%, Roth, Germany) and 0.5 M MgSO4·7H2O (pure, Roth, Germany) aqueous solution. MgSO4 simply serves as a conducting electrolyte to avoid high

• a scan rate of 200 mV s−1 for 50–100 cycles in N2-purged 0.5 M H2SO4 (prepared from 98% H2SO4, Roth, Germany) aqueous solution until the CVs did not change any more, while Pt-GC, Pt-CNT/GC and Pt-CNT/CNT/GC were cycled in the potential range from 0.05 V to 1.2 V vs RHE. After this treatment, the

Warped graphitic layers generated by oxidation of fullerene extraction residue and its oxygen reduction catalytic activity

• Machiko Takigami,
• Rieko Kobayashi,
• Takafumi Ishii,
• Yasuo Imashiro and
• Jun-ichi Ozaki

Beilstein J. Nanotechnol. 2019, 10, 1391–1400, doi:10.3762/bjnano.10.137

• the amount of surface functional groups. The details of this technique are described elsewhere [45][46]. Electrochemical techniques Cyclic voltammetry was used to evaluate the heterogeneous electron transfer rate of the carbons in an aqueous solution consisting of 6 × 10−3 mol/L K3[Fe(CN)6] and 1 mol

• perfluorinated resin solution, Aldrich) solution on a 4 mm glass-like carbon disk electrode (0.2 mg [carbon]/cm2, 0.1 mg [binder]/cm2). The reference electrode was a reversible hydrogen electrode (RHE). The electrolyte was a 0.5 mol/L H2SO4 aqueous solution. A voltammogram obtained in a N2-saturated electrolyte

Construction of a 0D/1D composite based on Au nanoparticles/CuBi₂O₄ microrods for efficient visible-light-driven photocatalytic activity

• Weilong Shi,
• Mingyang Li,
• Hongji Ren,
• Feng Guo,
• Xiliu Huang,
• Yu Shi and
• Yubin Tang

Beilstein J. Nanotechnol. 2019, 10, 1360–1367, doi:10.3762/bjnano.10.134

• onto the surface of CBO by a facile simple thermal reduction–precipitation method. A certain amount of prepared CBO microrods was added to an aqueous solution of HAuCl4·4H2O. Afterward, the mixed solution was heated to boiling under continuous stirring for 10 min. The as-prepared product was washed and

• method and dispersed in aqueous solution of HAuCl4. After vigorous stirring, Au3+ was adsorbed on the surface CBO microrods. Then, the precursor mixture was boiled to reduce Au3+ to Au NPs precipitating on the CBO microrods yielding the Au/CBO hybrid photocatalyst. The crystalline phases of CBO and Au

The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles

• Hajar Jalili,
• Bagher Aslibeiki,
• Ali Ghotbi Varzaneh and
• Volodymyr A. Chernenko

Beilstein J. Nanotechnol. 2019, 10, 1348–1359, doi:10.3762/bjnano.10.133

• deionized water to a concentration of 8.0 M. In the second step, the temperature of the metal-salt solution was raised 80 °C under stirring. Then, the aqueous solution of NaOH was added quickly to the solution at 80 °C. The obtained black slurry was constantly stirred at 80 °C for 30 min. The prepared

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

• (VC750 Sonics Vibra-Cell, operating at 20 kHz) using a 13 mm standard probe. Separately, chitosan was slowly dissolved in an aqueous solution of 1% v/v acetic acid at 70 °C and added to the SEP/HNTs/GNPs/MWCNTs dispersion under magnetic stirring. The bionanocomposite films were processed by solvent

A silver-nanoparticle/cellulose-nanofiber composite as a highly effective substrate for surface-enhanced Raman spectroscopy

• Yongxin Lu,
• Yan Luo,
• Zehao Lin and
• Jianguo Huang

Beilstein J. Nanotechnol. 2019, 10, 1270–1279, doi:10.3762/bjnano.10.126

• points on the paper substrate with an integration time of 5 s for each spectrum. To monitor the molecular recognition between adenosine and thymidine, 10 μL aqueous solution (10 µM) of each nucleoside was dripped separately onto two pieces of the paper substrates; after the evaporation of the solvent, 10

• μL aqueous solution of the complementary nucleoside was dripped onto the corresponding paper substrate, and then the SERS spectra were measured after drying under the same experimental conditions as noted above. The finite element method (FEM) modeling of the plasmonic properties of the silver

A highly efficient porous rod-like Ce-doped ZnO photocatalyst for the degradation of dye contaminants in water

• Binjing Hu,
• Qiang Sun,
• Chengyi Zuo,
• Yunxin Pei,
• Siwei Yang,
• Hui Zheng and
• Fangming Liu

Beilstein J. Nanotechnol. 2019, 10, 1157–1165, doi:10.3762/bjnano.10.115

• ratio of 0.5%, 1%, 2%, 3%, and 4% were named as CZO-1, CZO-2, CZO-3, CZO-4, and CZO-5, respectively. Photocatalytic activity measurements The photocatalytic activity was evaluated based on the degradation of RhB using a sunlight stimulator. First, 4 mg of the photocatalyst was added to the RhB aqueous

• solution (8 mL) with a concentration of 10 mg/L in numbered test tubes. The suspension was stirred for 30 min to reach the adsorption/desorption equilibration in darkness. Following this, the photocatalytic reaction was started by turning on the solar simulator. 1 mL of the suspension was sampled and

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

• pharmaceutical drugs, organic dyes, and phenols in aqueous solution. The single-step synthesis yields W–TiO2, Zr–TiO2 and Ce–TiO2 immobilized on the surface of delaminated layered clay derived from montmorillonite. The resulting doped TiO2@clay materials showed high specific surface area values and a slight

• shows good catalytic activity (ca. 85%) in the photodegradation of the antibiotic flumequine in aqueous solution. Interestingly, the sepiolite nanoarchitecture shows better degradation efficiency than the semiconducting components alone according to the following sequence [160]: TiO2–ZnO@sepiolite

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

• compound-modified chitosan, was introduced immediately after the first coating with heparin. An aqueous solution (5 mL) of modified chitosan (8.1 mg) was magnetically stirred at 50 °C for 20 min and cooled to RT, while the γ-Fe2O3@Hep nanoparticle dispersion was sonicated for 5 min. After 2 min of

• , precursor chitosan (0.5 g) was dissolved in 2 wt % acetic acid (50 mL) at 70 °C for 24 h with magnetic stirring, the solution was cooled to room temperature (RT), and a mixture of ascorbic acid (AA) (54 mg), water (0.9 mL), and 25% H2O2 (0.1 mL) was added to yield chitosan (CS). After 30 min, an aqueous

• solution (20 mL) of phenolic compound (0.35 mmol) was added dropwise, and the reaction vessel was wrapped with aluminum foil to protect the reactants from light. The mixture was magnetically stirred at RT for 24 h and dialyzed against water, which was changed at least eight times, for 48 h using a membrane

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

• TNW surface and 12-2-12 due to the two positively charged polar heads of 12-2-12. Micrographs of synthesized TNWs taken by a) high-resolution scanning electron microscopy and b) atomic force microscopy. Variation of zeta potential (ζ) with pH of TNWs in 10−3 mol dm−3 NaBr aqueous solution. γ(TNW) = 1

Correlation of surface-enhanced Raman scattering (SERS) with the surface density of gold nanoparticles: evaluation of the critical number of SERS tags for a detectable signal

• Vincenzo Amendola

Beilstein J. Nanotechnol. 2019, 10, 1016–1023, doi:10.3762/bjnano.10.102

• AuNP solution at a 1:100 volume ratio. After 30 min under mild stirring, an aqueous solution of thiolated polyethylene glycol (PEG, MW 5000, Sigma-Aldrich) was added to the AuNPs with a final concentration of 30 µM. After stirring for 14 h at room temperature, the mixtures were washed with deionized

• samples for TEM analysis were obtained by mixing the AuNT solution (0.2 mg/mL in Au) 1:5 with a 10 mg/mL aqueous solution of polyvinyl alcohol (PVA, 200,000 Mw, on average, from Fluka) and depositing one drop on a copper grid coated with a holey carbon film, according to a well-established procedure which

• for the same AuNT but with light polarized along the x-axis. (A) Sketch of sample preparation for combined Raman and TEM analysis: 20 µL of an aqueous dispersion of AuNTs (0.2 mg/mL in Au) is mixed with 100 µL of an aqueous solution of PVA (10 mg/mL); after homogenization by ultrasonication, one drop

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

• delivered in the highest grade available. Nanoparticle preparation The NPs were prepared by an previously described emulsification–diffusion method [19]. Briefly, 100 mg PLGA was dissolved in 2 mL ethyl acetate and subsequently added to 4 mL of an aqueous solution containing PVA (2%, w/w). The mixture was

Structural and optical properties of penicillamine-protected gold nanocluster fractions separated by sequential size-selective fractionation

• Xiupei Yang,
• Zhengli Yang,
• Fenglin Tang,
• Jing Xu,
• Maoxue Zhang and
• Martin M. F. Choi

Beilstein J. Nanotechnol. 2019, 10, 955–966, doi:10.3762/bjnano.10.96

• fractionation and purification of the monolayer-protected AuNCs. Through continuously adding acetone to a crude AuNC aqueous solution and controlling the volume percentage of acetone, we successfully separated the polydisperse AuNCs with diameters ranging from 0.5 to 5.4 nm into four different fractions

• size distribution in order to obtain their representative photophysical properties. As shown in Figure 1, SSSP was used to fractionation the crude AuNCs into four AuNCs fractions with different sizes. Briefly, organic solvent (acetone) was gradually added in an aqueous solution of AuNCs, whereby the

• centrifugation, and the smaller clusters are still dispersed in the solvent. Herein, we performed SSSP for the polydisperse penicillamine-coated water-soluble AuNCs from aqueous medium using acetone as a nonsolvent. When acetone was gradually added to the aqueous solution of AuNCs to achieve supersaturation of

Synthesis of novel C-doped g-C₃N₄ nanosheets coupled with CdIn₂S₄ for enhanced photocatalytic hydrogen evolution

• Jingshuai Chen,
• Chang-Jie Mao,
• Helin Niu and
• Ji-Ming Song

Beilstein J. Nanotechnol. 2019, 10, 912–921, doi:10.3762/bjnano.10.92

• as precursors. Subsequently, the CCN was dispersed in an aqueous solution containing thiourea, Cd(NO3)2·4H2O and In(NO3)3·4.5H2O. As a result of the electrostatic attraction between cations and negatively charged CCN [34], Cd2+ and In3+ could easily load on to the surface of the CCN nanosheets

• and a Pt wire was used as the counter electrode, respectively. The electrolyte was a 1 M Na2SO4 aqueous solution. A glassy carbon electrode containing the as-prepared sample served as the working electrode. Photocatalytic H2 production reaction In this work, the activity of the photocatalyst was

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

• PEG has gained considerable attention and interest due to its unique physiochemical properties [46]. The functionalization of GO with PEG has been reported to improve the stability in aqueous solution and the biocompatibility, making it an ideal drug-delivery vehicle [47][48]. Rapid progress has been

Tungsten disulfide-based nanocomposites for photothermal therapy

• Tzuriel Levin,
• Hagit Sade,
• Rina Ben-Shabbat Binyamini,
• Maayan Pour,
• Iftach Nachman and
• Jean-Paul Lellouche

Beilstein J. Nanotechnol. 2019, 10, 811–822, doi:10.3762/bjnano.10.81

• preparation procedures. Preparation of CAN-mag nanoparticles A solution of FeCl3·H2O (240.0 mg, 0.9 mmol) in degassed, ddH2O water (4.5 mL) was mixed with an aqueous solution of FeCl2·4H2O (97.5 mg, 0.45 mmol, 4.5 mL H2O). The mixture was kept under nitrogen and ultra-sonicated for 1 min at room temperature

Polydopamine-coated Au nanorods for targeted fluorescent cell imaging and photothermal therapy

• Boris N. Khlebtsov,
• Andrey M. Burov,
• Timofey E. Pylaev and
• Nikolai G. Khlebtsov

Beilstein J. Nanotechnol. 2019, 10, 794–803, doi:10.3762/bjnano.10.79

• nanocomposites have uniform size distributions, are stable in aqueous solution, nontoxic, demonstrate plasmonic extinction under NIR excitation, strong fluorescence under UV–vis excitation and the ability to selectively accumulate in folate-positive cancer cells. By using fluorescent microscopy we demonstrated

Commercial polycarbonate track-etched membranes as substrates for low-cost optical sensors

• Paula Martínez-Pérez and
• Jaime García-Rupérez

Beilstein J. Nanotechnol. 2019, 10, 677–683, doi:10.3762/bjnano.10.67

• firstly activated by oxygen plasma in a plasma asher (PVA TEPLA 200, PVA TePla AG, Wettenberg, Germany) for 1 min (50 W, 1.5 mbar). Immediately after, it was immersed in an aqueous solution of APTES at 80 °C for 20 min. Then, the membrane was removed from the solution and dried out on a cleanroom wipe