Carboxylic acids and light interact to affect nanoceria stability and dissolution in acidic aqueous environments

• Matthew L. Hancock,
• Eric A. Grulke and
• Robert A. Yokel

Beilstein J. Nanotechnol. 2023, 14, 762–780, doi:10.3762/bjnano.14.63

• , or precipitates, as suggested by the cerium carboxylate complexes in groups three to five above. Experimental Materials The following chemicals, including their sources, purity, and CAS numbers, were used: citric acid monohydrate, Fisher, ACS grade, 5949-29-1; ᴅʟ-malic acid, Alfa Aesar, 98%, 6915-15

Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

• Akeem Adeyemi Oladipo,
• Saba Derakhshan Oskouei and
• Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

• crystallisation of the first MOF in which metal ions are connected by carboxylate linkers (ligands) [67], as shown in Figure 11. The metal ions act as nodes, connecting the ligands’ arms to create a repetitive, cage-like structure. The internal surface area of MOFs is incredibly vast because of their hollow

• linkers have been used, many of which contain rigid backbones that have been substituted with multiple carboxylate groups for metal coordination. As linkers in MOFs, organic compounds with fused π rings and strong conjugation are frequently used. Due to their stiffness, they are frequently both very

Evaluation of electrosynthesized reduced graphene oxide–Ni/Fe/Co-based (oxy)hydroxide catalysts towards the oxygen evolution reaction

• Karolina Cysewska,
• Marcin Łapiński,
• Marcin Zając,
• Jakub Karczewski,
• Piotr Jasiński and
• Sebastian Molin

Beilstein J. Nanotechnol. 2023, 14, 420–433, doi:10.3762/bjnano.14.34

• oxidation with four different components corresponding to carbon atoms in different functional groups, that is, non-oxygenated ring C–C (284.9 eV), the C in C–O (286.6 eV) and C=O (288.5 eV) bonds, and carboxylate carbon O–C=O (290.0 eV), which agrees with the XAS analysis (Figure 3) [35]. The analysis

Cyclodextrins as eminent constituents in nanoarchitectonics for drug delivery systems

• Makoto Komiyama

Beilstein J. Nanotechnol. 2023, 14, 218–232, doi:10.3762/bjnano.14.21

• efficacy of chlorambucil was greatly increased since it remained in the cell for a long time. Furthermore, an anticancer drug and a resistance-suppressing gene were simultaneously delivered for cooperation [91]. For delayed drug release, anionic β-CyD polymers bearing carboxylate residues are useful [92

Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

• Mykhailo Nahorniak,
• Pamela Pasetto,
• Jean-Marc Greneche,
• Volodymyr Samaryk,
• Sandy Auguste,
• Anthony Rousseau,
• Nataliya Nosova and
• Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

• , oleic acid, and undecylenic acid pure substances agree with those described in the literature [28][29]. At the beginning of the first stage (S0 Stage1 for each of the acids), one can observe peaks of iron(III) acetylacetonate in the spectra. The vibration bands of the carboxylate group νa (COO–) are

• –) (∆ = COasym − COsym) in the region 1300–1650 cm−1 can be used to determine the carboxylate coordination mode. For ∆ > 200 cm−1, a monodentate ligand is expected, whereas for ∆ < 110 cm−1, a bidentate ligand is expected. For a bridging ligand, ∆ is between 110 and 200 cm−1 [31]. Spectra of the complexes (see

• undecylenic complexes at 1600 and 1552 cm−1. The zone of symmetric vibrations of the carboxylate group νs(COO–) of both oleate and undecylate complexes cannot be precisely determined because of the overlapping of different type absorption bands in 1-octadecene. However, according to the literature, it can be

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

• Abu Hashem,
• M. A. Motalib Hossain,
• Ab Rahman Marlinda,
• Mohammad Al Mamun,
• Khanom Simarani and
• Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

• hydrochloride (EDC) were used to covalently link DNA and oligonucleotides to a carboxylate-terminated alkanethiol self-assembled monolayer (SAM) performed on a gold electrode (AuE) [70]. The Lisdat group described a label-free impedimetric sensor for the detection of hybridisation events which is based on short

Design of surface nanostructures for chirality sensing based on quartz crystal microbalance

• Yinglin Ma,
• Xiangyun Xiao and
• Qingmin Ji

Beilstein J. Nanotechnol. 2022, 13, 1201–1219, doi:10.3762/bjnano.13.100

• of chiral MOF-based films by layer-by-layer (LBL) liquid-phase epitaxial (LPE) growth of [{Zn2((+)cam)2(dabco)}n] ((+)cam = (1R,3S)-(+)-camphoric acid, dabco = 1,4-diazabicyclo[2.2.2]octane) [104]. Through using SAMs with carboxylate and pyridyl groups, composite films (SURMOFs) with the enantiopure

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

• Aisha Kanwal,
• Naheed Bibi,
• Sajjad Hyder,
• Arif Muhammad,
• Hao Ren,
• Jiangtao Liu and
• Zhongli Lei

Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93

• functional groups such as amino, carboxylate, carbonyl, and hydroxy groups. The cytotoxicity study showed good biocompatibility and applicability in both in vitro and in vivo imaging [116]. Recently, milk was used by Al-Hashimi et al. as a natural precursor to synthesize N-CDs via a solvothermal method

Alcohol-perturbed self-assembly of the tobacco mosaic virus coat protein

• Ismael Abu-Baker and
• Amy Szuchmacher Blum

Beilstein J. Nanotechnol. 2022, 13, 355–362, doi:10.3762/bjnano.13.30

• surprising considering that protonation of Caspar carboxylate pairs around pH 6.5 reduces repulsion between disks, allowing for larger assemblies [41][42]. At higher pH of 6.8 and 7.5, the increased repulsion between subunits may discourage formation of stacked disks. In contrast, at pH 5.0, stacked disks

Self-assembly of amino acids toward functional biomaterials

• Huan Ren,
• Lifang Wu,
• Lina Tan,
• Yanni Bao,
• Yuchen Ma,
• Yong Jin and
• Qianli Zou

Beilstein J. Nanotechnol. 2021, 12, 1140–1150, doi:10.3762/bjnano.12.85

• pH values, which leads to inactive carboxylate forms [91][92]. Guo et al. [93] obtained water-soluble spiral nanofibers by coupling hydrophilic arginine and camptothecin. Self-assembly behavior is achieved by intermolecular π–π stacking and hydrophilic–hydrophobic interactions. The conjugates are

pH-driven enhancement of anti-tubercular drug loading on iron oxide nanoparticles for drug delivery in macrophages

• Karishma Berta Cotta,
• Sarika Mehra and
• Rajdip Bandyopadhyaya

Beilstein J. Nanotechnol. 2021, 12, 1127–1139, doi:10.3762/bjnano.12.84

• ]. Furthermore, their interaction with IONPs may be via carboxylate groups, amine groups or by neither [27]. pH variations thus can play a key role in promoting interactions between amino acids and metal oxide surfaces [29]. NOR has also been reported to form stable complexes with Fe2+/3+ [22]. It was also

• of piperazinyl and O–H lie within the same wavenumber range, thus, the peak observed at 3422.9 cm−1 could be attributed to both NH from NOR and OH from the surface Fe–OH groups present in the sample. Fluoroquinolones are believed to chelate Fe ions through their carboxylate and amine groups [22]. The

• interaction would occur between IONP and the negatively charged carboxylate group of NOR, as carboxylate would be present on the zwitterionic NOR± molecule at this acidic pH. The percentage of zwitterionic NOR± form, estimated through the Henderson–Hasselbalch equation is only 5.9% (Supporting Information

Nanocasting synthesis of BiFeO₃ nanoparticles with enhanced visible-light photocatalytic activity

• Thomas Cadenbach,
• Maria J. Benitez,
• A. Lucia Morales,
• Cesar Costa Vera,
• Luis Lascano,
• Francisco Quiroz,
• Alexis Debut and
• Karla Vizuete

Beilstein J. Nanotechnol. 2020, 11, 1822–1833, doi:10.3762/bjnano.11.164

• synthesis of pure-phase BiFeO3 is the in situ formation of Fe/Bi mixed metal complexes by using different complexing agents such as carboxylic acids. During the calcination process the carboxylate ligands in the Fe/Bi complexes decompose to CO2 and BiFeO3 is formed [29]. This synthetic technique requires

• ]. However, significant amounts of impurities could be identified in the samples, which can be assigned to Bi2O3 (approx. 33%) and Bi2O2.7 (16.5%). It should be noted that the Bi/Fe carboxylate intermediates resulting from the mixing of the corresponding metal nitrate precursors and tartaric acid are mostly

• catalyst surfaces are negatively charged, which leads to a repulsion of the negatively charged carboxylate functional groups of the dye molecule [51][54][59]. In addition, due to electrostatic interactions, RhB dimers are formed, which affects the charge density throughout the molecule and possibly leads

Transient coating of γ-Fe₂O₃ nanoparticles with glutamate for its delivery to and removal from brain nerve terminals

• Konstantin Paliienko,
• Artem Pastukhov,
• Michal Babič,
• Daniel Horák,
• Olga Vasylchenko and
• Tatiana Borisova

Beilstein J. Nanotechnol. 2020, 11, 1381–1393, doi:10.3762/bjnano.11.122

• ]glutamate adsorption. However, uptake and ambient level results were not adequate. Based on the literature data that carboxylic acids adsorbed on the oxide surface form a chelate-type bonds involving Fe(III) surface species and a carboxylate group [24], it was suggested that certain components of the

Photothermally active nanoparticles as a promising tool for eliminating bacteria and biofilms

• Mykola Borzenkov,
• Piersandro Pallavicini,
• Angelo Taglietti,
• Laura D’Alfonso,
• Maddalena Collini and
• Giuseppe Chirico

Beilstein J. Nanotechnol. 2020, 11, 1134–1146, doi:10.3762/bjnano.11.98

• application of gold-nanoparticle-coated surfaces and nanocomposite materials for antibacterial treatments. Gold nanoshells functionalized with carboxylate-terminated organosulfur ligands were attached to the surface of a model catheter and their effectiveness in eliminating adhering E. faecalis bacteria was

Internalization mechanisms of cell-penetrating peptides

• Ivana Ruseska and
• Andreas Zimmer

Beilstein J. Nanotechnol. 2020, 11, 101–123, doi:10.3762/bjnano.11.10

• partitioned into lipid phases from the aqueous phase in the presence of phosphatidylglycerol, a behavior of arginine often referred to as “arginine magic”. The guanidine group found on arginine has proven to form bidentate hydrogen bonds and electrostatic interaction with sulfate, phosphate and carboxylate

Charge-transfer interactions between fullerenes and a mesoporous tetrathiafulvalene-based metal–organic framework

• Manuel Souto,
• Joaquín Calbo,
• Samuel Mañas-Valero,
• Aron Walsh and
• Guillermo Mínguez Espallargas

Beilstein J. Nanotechnol. 2019, 10, 1883–1893, doi:10.3762/bjnano.10.183

• in the terminal carboxylate groups for charge neutrality. Interaction energies were calculated for the previously PBC-optimized crystal structures as the energy difference between the dimer and the constituting monomers. The hybrid B3LYP [67] with the Grimme’s D3 dispersion correction [68] (B3LYP-D3

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

• cm−1 (symmetric and asymmetric stretching vibration of ionized COO− groups) [39] as the carboxylic group should be present as carboxylate. In fact, the spectra show a large band in the range of 1630–1600 cm−1 due to the overlap of such bands with the one ascribed to δHOH vibration modes of water

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

• ., crystallinity controlled two-dimensional patterns based on guanidinium/carboxylate molecular recognition [196] and the two-dimensional assembly of one-dimensional supramolecular polymers formed between alkylated melamine and aqueous barbiturate [197] have been also accomplished. Oishi and co-workers utilized

• the balance between two competitive interactions, the phase separation of fluorocarbons and hydrocarbons and the attractive interaction between guanidiuium and carboxylate, to fabricate nanoscopic domains within a two-dimensional mixture of hydrocarbon guanidinium and fluorocarbon carboxylic acid [198

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

• deformation, N–H bending) [26] and the absorption peak at around 1330 cm−1 is related to the stretching vibration bands of the carboxylate group (C=O) [27]. The latter two peaks (1556 and 1330 cm−1) are observed in all samples and can be ascribed to the presence of some impurity in the KBr pellets, which is

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

• −1 may be assigned to C–O stretching vibrations. The peaks at around 1400 cm−1 and 1540 cm−1 are assigned to symmetric and asymmetric stretching vibrations of carboxylate [O–C–O]− ions. The positions of the peaks indicate attachment of the polymer ligand to the surface of the maghemite nanoparticles

• through carboxylate groups. In the species –COO–Fe, these are shifted to slightly higher energies compared to non-attached carboxylates [57][58]. The peaks at 2850 cm−1, 2920 cm−1, and 2960 cm−1 are assigned to C–H stretching vibrations in the PAA chain. The broad peak at 3400 cm−1 is stronger compared to

• protonated amine groups, and the WS2-NT-CM-PEI composite becomes positively charged. PAA is negatively charged (carboxylate groups), shifting the composite from −9.90 mV to −21.4 mV. Figure 8 shows the magnetization spectra of WS2-NT, CAN-mag, and WS2-NT-CM nanocomposites, all taken at a temperature of 10 K

Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores

• Kartheek Katta,
• Dmitry Busko,
• Yuri Avlasevich,
• Katharina Landfester,
• Stanislav Baluschev and
• Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2019, 10, 522–530, doi:10.3762/bjnano.10.53

• an inorganic layer and a liquid core containing a fluorophore. The polymeric capsules are synthesized by free radical miniemulsion polymerization and contain covalently bound carboxylate surface functionalities that allow for the binding of metal ions through electrostatic interaction. A cerium(IV

• . The crystallization of cerium(IV) oxide nanoparticles on the surface of the polymer nanocapsules is depicted in Figure 1. First, the cerium ions from the precursor are complexed by the carboxylate functional groups and the crystallization occurs upon addition of NaOH at a controlled rate. The SEM and

• atmosphere. The enhancement effect can be explained by the trapping of the quenching oxygen molecules on the metal oxide surface, which results in a reduction of the photo-oxidation. Schematic representation of the formation of cerium(IV) oxide on the surface of carboxylate functionalized fluorescent

Reduced graphene oxide supported C₃N₄ nanoflakes and quantum dots as metal-free catalysts for visible light assisted CO₂ reduction

• Md Rakibuddin and
• Haekyoung Kim

Beilstein J. Nanotechnol. 2019, 10, 448–458, doi:10.3762/bjnano.10.44

• , a sharp peak at 1380 cm−1 is observed, which can be ascribed to –C–O stretching vibrations of carboxylate groups, which are formed due to the breaking of some C–N bonds of triazine rings and their oxidation to carboxylic groups in the C3N4 NFs and QDs [19]. After the introduction of rGO to form GCN

• a small span of time (5 h). During the acid treatment process, some C–N bonds of the s-triazine units of the g-C3N4 sheet are oxidized and oxygen-containing carboxylate functional groups are generated at the edge and on the basal plane [19] as indicated by FTIR spectra (Figure 4). This results in

One-step nonhydrolytic sol–gel synthesis of mesoporous TiO₂ phosphonate hybrid materials

• Yanhui Wang,
• P. Hubert Mutin and
• Johan G. Alauzun

Beilstein J. Nanotechnol. 2019, 10, 356–362, doi:10.3762/bjnano.10.35

• case of metals, as M–C bonds are (in most cases) quite unstable, the organic groups can be linked to the metal oxide network via carboxylate or β-diketonate ligands [5][10][11]. Organophosphorus ligands such as phosphonates appear quite promising as they form strong ionocovalent M–O–P bonds with many

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

• from ethyl pyridine-2-carboxylate and 2-acetylfuran via in situ Claisen condensation reaction [49]. The reaction of the activated silica gel with (3-aminopropyl)trimethoxysilane in toluene afforded amino groups onto the silica surface (SiNH2), which were then reacted with L1 under gentle conditions

A novel polyhedral oligomeric silsesquioxane-modified layered double hydroxide: preparation, characterization and properties

• Xianwei Zhang,
• Zhongzhu Ma,
• Hong Fan,
• Carla Bittencourt,
• Jintao Wan and
• Philippe Dubois

Beilstein J. Nanotechnol. 2018, 9, 3053–3068, doi:10.3762/bjnano.9.284

• carboxylate groups, which could counterbalance multiple positive sheet charges. (iii) The high hydrocarbon content of the intercalator is helpful in improving the affinity of LDH to carbon-based materials. The OPCS-modified LDH (OLDH) was designed and prepared using a one-step route, followed by the