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

• was equilibrated to the desired temperature, optical measurements of the particles were acquired. FTIR spectral data was obtained using a Nicolet Nexus FTIR 670 spectrometer. Aqueous solutions of the hydrogel particles and pDADMAC were directly deposited onto a silicon wafer and dried under vacuum

Layered double hydroxide/sepiolite hybrid nanoarchitectures for the controlled release of herbicides

• Ediana Paula Rebitski,
• Margarita Darder and
• Pilar Aranda

Beilstein J. Nanotechnol. 2019, 10, 1679–1690, doi:10.3762/bjnano.10.163

• Pangel® S9, a commercial product of rheological grade that contains more than 95% pure sepiolite. Zein (Z) from maize, and alginate (A) were purchased from Sigma-Aldrich. Absolute ethanol was supplied by Panreac. Aqueous solutions were prepared from chemicals of analytical reagent grade: AlCl3·6H2O (>99

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

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

• sheets were used as SERS substrates, and aqueous solutions of R6G with different concentrations (from 1 × 10−6 M to 1 × 10−18 M) were used as the test samples. 10 μL R6G solution with the given concentration was dripped onto the Ag-NP/cellulose-NF substrate using a pipette; after the solvent was

Imaging the surface potential at the steps on the rutile TiO₂(110) surface by Kelvin probe force microscopy

• Masato Miyazaki,
• Huan Fei Wen,
• Quanzhen Zhang,
• Yuuki Adachi,
• Jan Brndiar,
• Ivan Štich,
• Yan Jun Li and
• Yasuhiro Sugawara

Beilstein J. Nanotechnol. 2019, 10, 1228–1236, doi:10.3762/bjnano.10.122

• preparation. The steps showed a higher photodegradation activity than the steps for aqueous solutions of methylene blue [23], indicating that the different step structures have different catalytic activities. KPFM measures the contact potential difference (CPD), corresponding to the difference in work

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

• aqueous solutions of ZnO and CZO-4 (8 ppm) were used to measure the specific chemical compositions. Conclusion In this study, we synthesized spherical ZnO and a series of rod-like Ce/ZnO catalysts via high temperature pyrolysis to investigate their photocatalytic performance using RhB as a model pollutant

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

• in aqueous solutions. In order to fill this void, in this study, the effect of monomers and micelles of (a) monomeric dodecyltrimethylammonium bromide (DTAB), and (b) its corresponding gemini, bis(N,N-dimethyl-N-dodecyl)ethylene-1,2-diammonium dibromide (12-2-12) quaternary ammonium surfactant

Effects of gold and PCL- or PLLA-coated silica nanoparticles on brain endothelial cells and the blood–brain barrier

• Aniela Bittner,
• Angélique D. Ducray,
• Hans Rudolf Widmer,
• Michael H. Stoffel and
• Meike Mevissen

Beilstein J. Nanotechnol. 2019, 10, 941–954, doi:10.3762/bjnano.10.95

• the chromophore indocyanine green (ICG). The latter enables the transduction of laser light into heat leading to denaturation of the albumin and, subsequently, tissue fusion [6]. As ICG is unstable in aqueous solutions and prone to fast photo-bleaching, the use of a stabilizing system, such as

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

• occur during the sensing event. Second, most solutions contain water and it is well known that its absorption coefficient in the NIR region is high [12]. If we place these aqueous solutions on the PCTE membrane in order to detect the presence of any component in it, part of the incident light will be

Removal of toxic heavy metals from river water samples using a porous silica surface modified with a new β-ketoenolic host

• Said Tighadouini,
• Smaail Radi,
• Abderrahman Elidrissi,
• Khadija Haboubi,
• Maryse Bacquet,
• Stéphanie Degoutin,
• Mustapha Zaghrioui and
• Yann Garcia

Beilstein J. Nanotechnol. 2019, 10, 262–273, doi:10.3762/bjnano.10.25

• thermodynamical properties including pH, adsorption isotherms, competitive adsorption, selectivity and regeneration were studied to investigate the effect of ketoenol–pyridine–furan–silica (SiNL) on the removal of Zn(II), Pb(II), Cd(II) and Cu(II) from aqueous solutions. An increase in adsorption as a function of

• from polluted media have been thus proposed. These include several well-known analytical chemistry methods [6][7][8][9][10][11][12][13][14][15][16] as well as adsorption materials able to extract metal ions from aqueous solutions [17][18][19][20][21][22][23]. However, this latter solution presents

• , zinc and copper metal ions from aqueous solutions as well as in natural water samples. Experimental Synthesis Solvents and chemicals, used without further purification, were of analytical grade (Aldrich, 99.5% purity). Silica gel (particle size of 70–230 mesh, median pore diameter of 60 Å) (E. Merck

Raman study of flash-lamp annealed aqueous Cu₂ZnSnS₄ nanocrystals

• Yevhenii Havryliuk,
• Oleksandr Selyshchev,
• Mykhailo Valakh,
• Alexandra Raevskaya,
• Oleksandr Stroyuk,
• Constance Schmidt,
• Volodymyr Dzhagan and
• Dietrich R. T. Zahn

Beilstein J. Nanotechnol. 2019, 10, 222–227, doi:10.3762/bjnano.10.20

• were prepared in aqueous solutions by the reaction of a mixture of mercaptoacetate (MA) complexes of Cu(II), Sn(II), and Zn(II) with sodium sulfide and a subsequent optional heat treatment at about 95 °C. An XPS study reported in [21] showed all the elements of CZTS to be present in the expected

Uniform Sb₂S₃ optical coatings by chemical spray method

• Jako S. Eensalu,
• Atanas Katerski,
• Erki Kärber,
• Ilona Oja Acik,
• Arvo Mere and
• Malle Krunks

Beilstein J. Nanotechnol. 2019, 10, 198–210, doi:10.3762/bjnano.10.18

• -deposited Sb2S3 by pneumatically spraying aqueous solutions (tartaric acid added as complexing agent to prevent hydrolysis [10], akin to studies by Rajpure et al. [11]) or methanolic solutions of SbCl3. Following, we studied the effect of the Sb/S precursor molar ratio in solution on ultrasonically sprayed

New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water

• Emmanuel I. Unuabonah,
• Robert Nöske,
• Jens Weber,
• Christina Günter and
• Andreas Taubert

Beilstein J. Nanotechnol. 2019, 10, 119–131, doi:10.3762/bjnano.10.11

• interesting both from stability and surface area aspects. Pollutant removal from aqueous solutions Removal of 4-nitrophenol We have previously reported that a first-generation HYCA material prepared via a low-temperature calcination process in air very efficiently adsorbs cationic pollutants such as Pb2+, Cd2

• when aqueous solutions with 4-nitrophenol concentrations of 1 mg/L were used. Moreover, a 50% breakthrough was reached at ≈900 min after treating 9 L of the same solution, and the 2Z-HYCA@650 °C was 100% spent after 28 h 40 min. This result demonstrates that 2Z-HYCA is a highly effective adsorbent for

The nanoscaled metal-organic framework ICR-2 as a carrier of porphyrins for photodynamic therapy

• Jan Hynek,
• Sebastian Jurík,
• Martina Koncošová,
• Jaroslav Zelenka,
• Ivana Křížová,
• Tomáš Ruml,
• Kaplan Kirakci,
• Ivo Jakubec,
• František Kovanda,
• Kamil Lang and
• Jan Demel

Beilstein J. Nanotechnol. 2018, 9, 2960–2967, doi:10.3762/bjnano.9.275

• Inorganic Chemistry Rez) constructed from Fe3+ and phenylene-1,4-bis(methylphosphinic acid) (PBPA) linkers [25]. ICR-2 in the microcrystalline form is stable in aqueous solutions even at high temperatures and partly retains its structure and porosity even after treatment with phosphate buffer saline (PBS

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

• Alexander Rostek,
• Marina Breisch,
• Kevin Pappert,
• Kateryna Loza,
• Marc Heggen,
• Manfred Köller,
• Christina Sengstock and
• Matthias Epple

Beilstein J. Nanotechnol. 2018, 9, 2763–2774, doi:10.3762/bjnano.9.258

• = 40,000 g mol−1), sodium borohydride (Sigma-Aldrich, ≥96%, p.a.) trisodium citrate (Acros, anhydrous 98%), tannic acid (Fluka, p.a.), and D-glucose (Baker, p.a.) were all used as obtained. Aqueous solutions of H2PtCl6 or HAuCl4 (prepared by dissolution of platinum or gold in aqua regia), RhCl3, NaPdCl4

• -octadecene, OAm) [68], or in aqueous solutions. Depending on the additives and the reaction conditions, a variety of different shapes and sizes can be realized [66][67][69][70][71][72][73][74]. The generation of small silver nanoparticles (3–6 nm) is often performed only to generate seeds as a precursor for

Size-selected Fe₃O₄–Au hybrid nanoparticles for improved magnetism-based theranostics

• Maria V. Efremova,
• Yulia A. Nalench,
• Eirini Myrovali,
• Anastasiia S. Garanina,
• Ivan S. Grebennikov,
• Polina K. Gifer,
• Maxim A. Abakumov,
• Marina Spasova,
• Makis Angelakeris,
• Alexander G. Savchenko,
• Michael Farle,
• Natalia L. Klyachko,
• Alexander G. Majouga and
• Ulf Wiedwald

Beilstein J. Nanotechnol. 2018, 9, 2684–2699, doi:10.3762/bjnano.9.251

• acquisition. Figure 6A depicts a set of two hyperthermia sequences, composed of a heating (magnetic field is switched on) and a cooling stage (magnetic field is switched off), for two aqueous solutions, respectively. It is apparent that there is a critical magnetite size that renders such structures suitable

Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation

• Wei-Hung Hsu,
• Frances Camille P. Masim,
• Armandas Balčytis,
• Hsin-Hui Huang,
• Tetsu Yonezawa,
• Aleksandr A. Kuchmizhak,
• Saulius Juodkazis and
• Koji Hatanaka

Beilstein J. Nanotechnol. 2018, 9, 2609–2617, doi:10.3762/bjnano.9.242

• laser and plasmonic nanoparticles will contribute to a broad field of applications ranging from pulsed X-ray generation to energetic particle sources [14] or terahertz wave emission from aqueous solutions [16]. In recent experimental studies, intense fs-laser excitation of plasmonic gold nanoparticles

• solution surface for different Δt up to 15 ns [28]. Analyses of the relation between the time-dependent X-ray generation and the optimum laser irradiation position are still missing for other aqueous solutions, especially for experiments under ambient pressure. Previous studies, mostly with solid targets

Non-agglomerated silicon–organic nanoparticles and their nanocomplexes with oligonucleotides: synthesis and properties

• Asya S. Levina,
• Marina N. Repkova,
• Nadezhda V. Shikina,
• Zinfer R. Ismagilov,
• Svetlana A. Yashnik,
• Dmitrii V. Semenov,
• Yulia I. Savinovskaya,
• Natalia A. Mazurkova,
• Inna A. Pyshnaya and
• Valentina F. Zarytova

Beilstein J. Nanotechnol. 2018, 9, 2516–2525, doi:10.3762/bjnano.9.234

• conjugated with oligodeoxyribonucleotides (ODN) through the binding to the negatively charged internucleotide phosphate groups to form Si–NH2·ODN complexes. Like Si–NH2, the Si–NH2·ODN nanocomplexes are dissolved in aqueous solutions. The addition of NaCl did not lead to precipitation. Si–NH2 and Si–NH2·ODN

• Si–NH2·ODN nanocomplexes were characterized by physico-chemical methods. The proposed nanocomplexes appeared to form very small nanoparticles (which are dissolved in aqueous solutions), then penetrate into the cellular cytoplasm to deliver oligonucleotides to the nucleus. The main advantage of the

• proposed Si–NH2 nanoparticles and Si–NH2·ODN nanocomplexes is that they are not prone to aggregation and form true aqueous solutions. The Si–NH2·ODN nanocomplexes exhibit biological activity, which has been shown with an example of the inhibition of influenza A virus replication. The proposed nanocomplexes

ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions

• Marina Krasovska,
• Vjaceslavs Gerbreders,
• Irena Mihailova,
• Andrejs Ogurcovs,
• Eriks Sledevskis,
• Andrejs Gerbreders and
• Pavels Sarajevs

Beilstein J. Nanotechnol. 2018, 9, 2421–2431, doi:10.3762/bjnano.9.227

• , using aqueous solutions of Pb(NO3)2 and Cd(NO3)2 as analytes with different concentrations. It was found that the sensitivity of the resulting electrochemical sensors depends on the morphology of the ZnO nanostructures: the best results were achieved in the case of porous nanostructures (nanotubes and

• were carried out using these nanostructured ZnO coatings on the working electrodes using aqueous solutions of Pb(NO3)2 and Cd(NO3)2 as analytes with different concentrations. Experimental Design and fabrication of the ZnO nanostructure-based electrochemical sensor Three morphologies of well-aligned one

• -dimensional ZnO nanostructures were selected for the experiment: nanorods, nanoneedles and nanotubes. The samples were prepared according to the following description. Glass slides (76 × 26 × 1 mm) were precleaned via ultrasonication in aqueous solutions of KOH and H2SO4, followed by several rinses with

Droplet-based synthesis of homogeneous magnetic iron oxide nanoparticles

• Christian D. Ahrberg,
• Ji Wook Choi and
• Bong Geun Chung

Beilstein J. Nanotechnol. 2018, 9, 2413–2420, doi:10.3762/bjnano.9.226

• oxide nanoparticles Nanoparticles were synthesized using a coprecipitation reaction as previously described [17]. Briefly, two aqueous solutions were mixed. The first solution contained 0.06 M of FeCl3·6H2O (Alfa Aesar, USA) and 0.03 M of FeCl2∙4H2O (Sigma-Aldrich, USA) dissolved in water. The second

Nanotribology

• Enrico Gnecco,
• Susan Perkin,
• Andrea Vanossi and
• Ernst Meyer

Beilstein J. Nanotechnol. 2018, 9, 2330–2331, doi:10.3762/bjnano.9.217

• India, China, Argentina, Cameroon, Russia and USA back to many countries in Old Europe). The covered topics include lubrication, surface preparation and theoretical models of friction at the nanoscale. Regarding the first topic, this Thematic Series gives examples of cutting-edge aqueous solutions

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

• fragments [32] and appear due to the reaction conditions (see Experimental section). Because of the presence of mPEG groups, compound 3 can be considered a non-ionic surfactant. It is known, that in aqueous solutions of non-ionic surfactants increasing temperatures leads to phase separation. There are two

• , Supporting Information File 1). The solubilisation of Orange OT and QC in aqueous solutions of 3 and mPEG-550 demonstrated the advantage of the macrocycle in the encapsulation of these substrates (Figure 5a,b). UV–vis spectra of the obtained solutions showed a significant increase of the solubility of

• = 1.5418 Å, (b) Guinier plot ln(I) as a function of s2 with linear regression of the curve; Rg = 53.5 ± 1.8 Å, I(0) = 531 ± 18, r = 0.98. (a) The intensity-averaged particle size distribution of aqueous solutions of 3 at different concentrations; (b, c) TEM images of particles of 3, scale bars: (b) 500 nm

Fabrication of photothermally active poly(vinyl alcohol) films with gold nanostars for antibacterial applications

• Mykola Borzenkov,
• Maria Moros,
• Claudia Tortiglione,
• Serena Bertoldi,
• Nicola Contessi,
• Silvia Faré,
• Angelo Taglietti,
• Agnese D’Agostino,
• Piersandro Pallavicini,
• Maddalena Collini and
• Giuseppe Chirico

Beilstein J. Nanotechnol. 2018, 9, 2040–2048, doi:10.3762/bjnano.9.193

• surfactants, they were coated with either SH-PEG5000–OCH3 or SH-PEG5000–COOH before being incorporated in the PVA matrix, as PEGylation of gold nanostars leads to enhanced stability [9][10] and complete surfactant removal [6][8].The aqueous solutions of PEGylated GNSs were prepared with 0.6 mg/mL Au

• by spectrophotometric measurements as explained before. At least two biological replicas were conducted to calculate the mean and standard deviation. Statistical analysis was performed using GraphPad Prism v.6. Extinction spectra of aqueous solutions of PEGylated GNSs (A) and the PVA-GNS film (B

A visible-light-controlled platform for prolonged drug release based on Ag-doped TiO₂ nanotubes with a hydrophobic layer

• Caihong Liang,
• Jiang Wen and
• Xiaoming Liao

Beilstein J. Nanotechnol. 2018, 9, 1793–1801, doi:10.3762/bjnano.9.170

• , toluene, oxydol, NaBH4, AgNO3, and Zn(AC)2 were purchased from KeLong Chemical (AR, Chengdu, China). Other chemical reagents used in these experiments were of analytical grade and were used directly without further purification. Deionized (DI) water was used to clean and prepare aqueous solutions

Uniform cobalt nanoparticles embedded in hexagonal mesoporous nanoplates as a magnetically separable, recyclable adsorbent

• Can Zhao,
• Yuexiao Song,
• Tianyu Xiang,
• Wenxiu Qu,
• Shuo Lou,
• Xiaohong Yin and
• Feng Xin

Beilstein J. Nanotechnol. 2018, 9, 1770–1781, doi:10.3762/bjnano.9.168

• ) has proved to be one of the most effective strategies for enhancing their adsorption performance in aqueous solutions [10][11][12]. Torad et al. [13] reported the high adsorption capacity of porous carbon particles with magnetic Co nanoparticles towards methylene blue (MB) dye. They attributed this to

• used as an adsorbent for efficient removal of RhB dye from aqueous solutions. As illustrated in Scheme 1, firstly, CoAl LDH is synthesized with urea through a hydrothermal method. Subsequently, the LDH@PDA composite is obtained by coating CoAl LDH with PDA through self-polymerization of dopamine in

• . The volume of ethanol is 10 mL for 10 mg adsorbent each time. After the desorption process, the NPL samples are used for the removal of RhB from aqueous solutions for five cycles (Figure 9). It was found that the NPLs-2.5-800 adsorbent possesses the best adsorption capacity, where removal efficiency