Applications of superparamagnetic iron oxide nanoparticles in drug and therapeutic delivery, and biotechnological advancements

• Maria Suciu,
• Corina M. Ionescu,
• Alexandra Ciorita,
• Septimiu C. Tripon,
• Dragos Nica,
• Hani Al-Salami and
• Lucian Barbu-Tudoran

Beilstein J. Nanotechnol. 2020, 11, 1092–1109, doi:10.3762/bjnano.11.94

• zeta potential values ranging from −40 to +20 mV and formed stable colloids. The zeta potential and the ligands present at the SPION surface showed equal importance in determining the amount of iron oxide engulfed by the cells [95]. Hydrophobic particles are rapidly recognized and engulfed by the

Agglomerates of nanoparticles

• Dieter Vollath

Beilstein J. Nanotechnol. 2020, 11, 854–857, doi:10.3762/bjnano.11.70

• microscopy of individual particles to analyze their shape or structure, it is necessary to apply a separation process. Earlier, the problem of agglomeration was already discussed in connection with colloids [2][3][4][5][6]. Recently, two studies of the formation of agglomerates of nanoparticles were

Preparation and in vivo evaluation of glyco-gold nanoparticles carrying synthetic mycobacterial hexaarabinofuranoside

• Gennady L. Burygin,
• Polina I. Abronina,
• Nikita M. Podvalnyy,
• Sergey A. Staroverov,
• Leonid O. Kononov and
• Lev A. Dykman

Beilstein J. Nanotechnol. 2020, 11, 480–493, doi:10.3762/bjnano.11.39

• . Another advantage of using these GNPs is their strong light absorption due to localized surface plasmon resonance (LSPR) around 520 nm while colloids of GNPs smaller than 3 nm do not exhibit an LSPR and are barely colored. It is known that the color of GNP colloids dramatically depends on size and shape

• of the spacers in glycosides 1 and 2 were also expected to affect the stability of the formed Ara6-GNPs 3 and 4. Stability of glyco-GNPs Gold hydrosols are typical lyophobic colloids that are stable only under conditions of low ionic strength. Under physiological conditions, GNPs are

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

• particles of similar sizes [58][60][61]. Since the surface of the particles corresponds to that of particles from a standard Stöber synthesis, the colloids can be functionalized with the same diverse methods as Stöber silica particles [58]. Figure S5 in Supporting Information File 1 shows X-ray diffraction

The role of Ag⁺, Ca²⁺, Pb²⁺ and Al³⁺ adions in the SERS turn-on effect of anionic analytes

• Stefania D. Iancu,
• Andrei Stefancu,
• Vlad Moisoiu,
• Loredana F. Leopold and
• Nicolae Leopold

Beilstein J. Nanotechnol. 2019, 10, 2338–2345, doi:10.3762/bjnano.10.224

• technique with detection limits below nanomolar concentrations and is able to resolve single molecules of cationic dyes such as rhodamine 6G or crystal violet. The SERS detection of such cationic analytes has been achieved by using chloride-activated colloids, with chloride assuming the role of an

• species to the nanoparticle surface makes their SERS detection challenging since the most used SERS colloids contain anionic capping agents such as chloride or citrate. Table 1 summarizes several SERS studies of anionic species showing the detected anionic analyte, the concentration and the employed SERS

• they provide a good trade-off between colloidal stability and surfactant affinity to the AgNP. We avoided the use of chloride-containing silver colloids [13][25] because of the competitive chemisorption between the anionic analyte and the Cl− capping agent to the Ca2+, Pb2+ or Al3+ activated AgNPs, Cl

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

• (water and HBS buffer) were characterized by two populations. The volume distribution was still dominated by small-size nanomaterials (Dh ≈ 10 nm, Figure 5), although their intensity generally decreased with respect to larger colloids (Table 2 and Supporting Information File 1, Figures S23 and S24). This

• mannose residues were not hidden within the polymer colloids but were exposed for binding, since all the other glycopolymers did precipitate the lectin. The divalent compound PEG8-PCL2-Man2 was the most efficient agglutinating agent of the series, even more potent than the octa- and tetra-valent polymers

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

• MBs that incorporate IONPs are often made of polymers. For example, ultrasmall superparamagnetic iron oxide nanoparticles were embedded in the wall of poly(butyl cyanoacrylate)-based MBs, allowing the blood‒brain barrier penetration to be monitored [23]. Soft-shell colloids called lipospheres have

Pulsed laser synthesis of highly active Ag–Rh and Ag–Pt antenna–reactor-type plasmonic catalysts

• Kenneth A. Kane and
• Massimo F. Bertino

Beilstein J. Nanotechnol. 2019, 10, 1958–1963, doi:10.3762/bjnano.10.192

• Kenneth A. Kane Massimo F. Bertino Department of Physics, Virginia Commonwealth University, Richmond, Virginia, 23220, USA 10.3762/bjnano.10.192 Abstract Ag, Pt, and Rh monometallic colloids were produced via laser ablation. Separate Ag–Rh and Ag–Pt heterostructures were formed by mixing and

• for the monometallic precursor colloids, which are mixed together without any post laser treatment to form unalloyed heterostructures, is based on a previously reported method [20]. The reduction of 4-nitrophenol is a widely utilized benchmark method for gauging catalytic activity [21][22] as the rate

• benefits: (1) the absence of surfactants and ligands; (2) a simple, robust, and quick two-step method production; (3) bulk targets of the constituent metals as the only necessary ingredients. Experimental The synthesis of the monometallic colloids was carried out using a EKSPLA SL312G/SH/TH pulsed laser

A biomimetic nanofluidic diode based on surface-modified polymeric carbon nitride nanotubes

• Kai Xiao,
• Baris Kumru,
• Lu Chen,
• Lei Jiang,
• Bernhard V. K. J. Schmidt and
• Markus Antonietti

Beilstein J. Nanotechnol. 2019, 10, 1316–1323, doi:10.3762/bjnano.10.130

• Kai Xiao Baris Kumru Lu Chen Lei Jiang Bernhard V. K. J. Schmidt Markus Antonietti Max Planck Institute of Colloids and Interfaces, Department of Colloid Chemistry, 14476 Potsdam, Germany Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of

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

• fibrous clay, together with ultrasonication, is the key to disperse all these components in water. The resulting stable colloids can be processed as films and foams displaying acceptable mechanical properties, good electrical conductivity, and controlled porosity useful for diverse applications at the

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

• chitosan-modified colloids at 260 K were similar and lower than those of the γ-Fe2O3 (by 6.3%) and γ-Fe2O3@Hep colloids (by 4.2%). Measurements of the magnetization as a function of the temperature were also performed for all colloids. The curves were very similar to that for the γ-Fe2O3@Hep-CS-G (Figure

• (10–260 K) and magnetic field (up to 5.5 T) was obtained for colloids frozen in quartz tubes using an MPMS superconducting quantum interference device (SQUID; Quantum Design; San Diego, CA, USA). The temperature dependence was analyzed using zero-field-cooled (ZF-C) and field-cooled (F-C) measurements

• aqueous γ-Fe2O3 colloid (4.4 mg/mL) at 260 K. The inset shows the magnetization curves of all colloids normalized by the nanoparticle weight. (d) Temperature dependence of the magnetization of the γ-Fe2O3@Hep-CS-G colloid. H is the applied magnetic field, and μ0 is the magnetic permeability of vacuum

Features and advantages of flexible silicon nanowires for SERS applications

• Hrvoje Gebavi,
• Vlatko Gašparić,
• Dubravko Risović,
• Nikola Baran,
• Paweł Henryk Albrycht and
• Mile Ivanda

Beilstein J. Nanotechnol. 2019, 10, 725–734, doi:10.3762/bjnano.10.72

• nanostructures are used on either colloidal or solid substrates. A carefully prepared substrate for a specifically targeted molecule is of the crucial importance for the low SERS detection limit. The nanostructured surface significantly increases the effective SERS surface area of the substrates. Colloids are

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

• valence states (Cu+, Zn2+, Sn4+, S2−), Cu(II) was reduced to Cu(I) and Sn(II) was oxidized to Sn(IV) in situ during the NC formation. The concentration of the as-prepared CZTS colloids was around 30 g/L and can be further increased by solvent evaporation or a precipitation/redispersion procedure [21

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

• Colloids and Interfaces, University of Potsdam, Alexander von Humboldt Foundation, and Chinese Academy of Sciences are also appreciated for financial support.

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

• ) (Figure S1, Supporting Information File 1). We prepared ICR-2 nanoparticles (nanoICR-2) the surface of which we modified with three different anionic porphyrins forming stable colloids in absolute EtOH or N,N-dimethylformamide (DMF) (Figure 1). Importantly, the porphyrins on the nanoparticle surfaces

• the DMF solution was 1.25 mmol (nanoICR-2/TPPPi(Ph)½) and 0.625 mmol (nanoICR-2/TPPPi(Ph)¼). This led to lower porphyrin concentrations in the resulting colloids of 6 × 10−5 mol·L−1 and 3 × 10−5 mol·L−1 for nanoICR-2/TPPPi(Ph)½ and nanoICR-2/ TPPPi(Ph)¼, respectively. Stability studies: NanoICR-2

Nanostructured liquid crystal systems and applications

• Alexei R. Khokhlov and
• Alexander V. Emelyanenko

Beilstein J. Nanotechnol. 2018, 9, 2644–2645, doi:10.3762/bjnano.9.245

• directions, such as novel LC phases, structure and phase behavior design and synthesis of LC materials photonic, electro- and photo-responsive LC systems theory and simulations of LC systems LC polymers, elastomers, colloids and gels hybrid and nanostructured LC systems biological, lyotropic and chromonic LC

Cytotoxicity of doxorubicin-conjugated poly[N-(2-hydroxypropyl)methacrylamide]-modified γ-Fe₂O₃ nanoparticles towards human tumor cells

• Zdeněk Plichta,
• Yulia Kozak,
• Rostyslav Panchuk,
• Viktoria Sokolova,
• Matthias Epple,
• Lesya Kobylinska,
• Pavla Jendelová and
• Daniel Horák

Beilstein J. Nanotechnol. 2018, 9, 2533–2545, doi:10.3762/bjnano.9.236

• studies of Dox-conjugated polymer-coated γ-Fe2O3 nanoparticles by primary cells (hMSCs) and human tumor cells (MG-63 and HeLa) were carried out as follows. The cells were incubated with appropriate amounts of the particle colloids for 48 h and washed with PBS three times to remove dissolved compounds not

Nanocellulose: Recent advances and its prospects in environmental remediation

• Katrina Pui Yee Shak,
• Yean Ling Pang and
• Shee Keat Mah

Beilstein J. Nanotechnol. 2018, 9, 2479–2498, doi:10.3762/bjnano.9.232

• nanocellulose, which could be particularly useful for particle aggregation of negatively charged pollutants to coagulate and flocculate kaolin colloids as reported by Liimatainen et al. [79]. On the other hand, the utilization of green solvents (ionic liquids) as both solvent and catalyst for cellulose

• case, rod-shaped particles (commonly found in CNC) could deplete larger colloids than spherical particles [145]. Besides, the introduction of cationic pyridinium and imidazole functional groups through grafting provided an advantage to CNCs over common polymer flocculants in terms of flocculation

SERS active Ag–SiO₂ nanoparticles obtained by laser ablation of silver in colloidal silica

• Cristina Gellini,
• Francesco Muniz-Miranda,
• Alfonso Pedone and
• Maurizio Muniz-Miranda

Beilstein J. Nanotechnol. 2018, 9, 2396–2404, doi:10.3762/bjnano.9.224

• adhere to silica can be stabilized in colloidal suspensions far better than in pure metal colloids, providing improved reproducibility of the SERS data. The second motivation is to exploit the adsorption capability of the colloidal silica for various organic ligands, for example glucose, formaldehyde

• exciting radiation matches the plasmonic band. The observed SERS frequencies (see Figure 3B,C) correspond to those of bpy adsorbed on silver colloids [42][43], reported in Table 1. From a spectroscopic point of view, the silica/silver colloidal substrate presented in this work allows the SERS spectra to be

• completely comparable with those recorded in pure silver colloids, with regards to both frequency and intensity. In this regard, we present the SERS spectrum of 2,2’-bipyridine adsorbed on silver nanoparticles obtained by laser ablation in water in Figure S4 of the Supporting Information File 1. This

Block copolymers for designing nanostructured porous coatings

• Roberto Nisticò

Beilstein J. Nanotechnol. 2018, 9, 2332–2344, doi:10.3762/bjnano.9.218

• dimensions [11]. Conversely, a “bottom-up” approach involves the growth of (sub)nanometer components (i.e., colloids, (macro)molecules, or even atoms) to produce complex nanoarchitectures [12]. The fabrication of well-ordered nanostructured materials has developed considerably in recent years, thus becoming

The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement

• Nicolae Leopold,
• Andrei Stefancu,
• Krisztian Herman,
• István Sz. Tódor,
• Stefania D. Iancu,
• Vlad Moisoiu and
• Loredana F. Leopold

Beilstein J. Nanotechnol. 2018, 9, 2236–2247, doi:10.3762/bjnano.9.208

• the advantages of Cl-AgNPs compared to the as-synthesized AgNPs obtained by standard Ag+ reduction with hydroxylamine (hya-AgNPS) or citrate (cit-AgNPs). The results of SERS experiments on anionic and cationic test molecules comparing Cl-AgNPs, hya-AgNPs and cit-AgNPs colloids activated with different

• added to metal colloids to enhance the Raman signal of the analytes. This phenomenon can be explained by two distinct mechanisms: the electromagnetic mechanism and the chemical effect. Each mechanism is believed to contribute complementary to the Raman scattering enhancement of the adsorbate in SERS

• with the distance from the metal surface. Chloride ions, when used at concentrations higher than 0.1 M, induce the aggregation of the metal colloids. The addition of Cl− ions to the colloidal solution reduces the absolute zeta potential value of the nanoparticles, leading to a decrease in the stability

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

• Muhammad Imran,
• Nunzio Motta and
• Mahnaz Shafiei

Beilstein J. Nanotechnol. 2018, 9, 2128–2170, doi:10.3762/bjnano.9.202

Recent highlights in nanoscale and mesoscale friction

• Andrea Vanossi,
• Dirk Dietzel,
• Andre Schirmeisen,
• Ernst Meyer,
• Rémy Pawlak,
• Thilo Glatzel,
• Marcin Kisiel,
• Shigeki Kawai and
• Nicola Manini

Beilstein J. Nanotechnol. 2018, 9, 1995–2014, doi:10.3762/bjnano.9.190

• “Trapped optical systems: ions and colloids” reviews recent experiments and theory exploring the depinning and sliding mechanisms in analog model systems controlled by forces generated by electromagnetic fields. A successive section “Controlling friction and wear at the nanometer scale” addresses novel

• colloids” for more details). However, in more conventional nanomanipulation experiments such a transition could not yet be actively induced, most probably due to insufficient normal forces [50][76][84]. Nonetheless, this does not mean that interface-relaxation effects play no role even for relatively rigid

• identified in the simple ideal 1D geometry [137][138][139][140] was also demonstrated in 2D [141][142] and 3D [143] realistic numerical simulations, but it still awaits experimental confirmation. Trapped optical systems: ions and colloids One of the main challenges and difficulties in unraveling the

Cryochemical synthesis of ultrasmall, highly crystalline, nanostructured metal oxides and salts

• Elena A. Trusova and
• Nikolai S. Trutnev

Beilstein J. Nanotechnol. 2018, 9, 1755–1763, doi:10.3762/bjnano.9.166

• inorganic salts in these solvents limits their application in cryochemical processing. Along with aqueous solutions, in the last few years the freezing of colloids (gels, suspensions) and precipitates has been increasingly used [8]. As a rule, salts solutions are treated by fast cooling [9]. For example

• of the chain aggregates was related to the ice structure formed during freezing [10]. The cryoprocessing of liquid media, solutions and colloids can be used to limit the growth and agglomeration of the formed particles, to stabilize their surface, and thus, to obtain discrete particles of

• , including a modified sol–gel synthesis of the colloids and their cryogenic processing, was used in the synthesis of nickel, iron and cerium oxide nanopowders. In this case, cerium, iron and nickel nitrates were used as metal sources for the synthesis of metal-containing sols. The sol synthesis was carried

Nanoporous silicon nitride-based membranes of controlled pore size, shape and areal density: Fabrication as well as electrophoretic and molecular filtering characterization

• Axel Seidenstücker,
• Stefan Beirle,
• Fabian Enderle,
• Paul Ziemann,
• Othmar Marti and
• Alfred Plettl

Beilstein J. Nanotechnol. 2018, 9, 1390–1398, doi:10.3762/bjnano.9.131

• purpose monolayers of non-close-packed colloids, and diblock or triblock copolymers were used [23][24][25][26][27]. For the present work with targeted pore sizes of some nanometers up to 50 nm in about 50 nm thick membranes, the sought control of pore shape with smooth inner pore surfaces, and, most