Stereodiscrimination of guests in chiral organosilica aerogels studied by ESR spectroscopy

• Sebastian Polarz,
• Yasar Krysiak,
• Martin Wessig and
• Florian Kuhlmann

Beilstein J. Nanotechnol. 2025, 16, 2034–2054, doi:10.3762/bjnano.16.140

• synthesis, 0.22 mmol of 1,3-bis(triisopropoxysilyl)thiophenol is dissolved in 2 mL of ethanol. 50 µL of a 1 M HCl solution is added under vigorous stirring. After hydrolysis for 1 h, 50 µL of concentrated ammonia was added, and the solution was filled into a syringe and gelled overnight. Aerogels can be

• stirring. The solution was hydrolyzed at 60 °C for 4.5 h. After cooling to room temperature, 0.15 mL 1 M ammonia was added dropwise. For extraction of the monolithic aerogel, the material was overlaid with ethanol for 12 h. The supernatant was removed, and extraction was repeated for four times. Now a

• )thiophenol are dissolved in ethanol (0.95 mL). Hydrochloric acid (0.05 mL, 1 M, 0.05 mmol) is added and the solution is stirred for 5 h. After hydrolysis, ammonia (0.15 mL, 1 M, 0.05 mmol) is added under vigorous stirring. The solution is stirred for 1 min and then transferred into a syringe. After 15 min

Ambient pressure XPS at MAX IV

• Mattia Scardamaglia,
• Ulrike Küst,
• Alexander Klyushin,
• Rosemary Jones,
• Jan Knudsen,
• Robert Temperton,
• Andrey Shavorskiy and
• Esko Kokkonen

Beilstein J. Nanotechnol. 2025, 16, 1677–1694, doi:10.3762/bjnano.16.118

• different measurement schemes are presented below. The data are taken from two experiments performed at the SLE of the HIPPIE beamline, while exposing a catalyst to gas pulses. Ammonia oxidation (microsecond time-resolution, pump–probe mode): This experiment used 150 µs wide 170 V voltage pulses with a

Nanotechnology-based approaches for the removal of microplastics from wastewater: a comprehensive review

• Nayanathara O Sanjeev,
• Manjunath Singanodi Vallabha and
• Rebekah Rubidha Lisha Rabi

Beilstein J. Nanotechnol. 2025, 16, 1607–1632, doi:10.3762/bjnano.16.114

• found that polystyrene NPs, more than MPs, inhibited the growth of Halomonas alkaliphila, disrupted ammonia conversion, and induced oxidative stress. These findings highlight the effect of plastic debris on marine microbial functions, potentially disrupting nitrogen cycles and ecological balance. When

Synthesis and antibacterial properties of nanosilver-modified cellulose triacetate membranes for seawater desalination

• Lei Wang,
• Shizhe Li,
• Kexin Xu,
• Wenjun Li,
• Ying Li and
• Gang Liu

Beilstein J. Nanotechnol. 2025, 16, 1380–1391, doi:10.3762/bjnano.16.100

• PDA which contains catechol and nitrogen-containing groups, as both a reducing and crosslinking agent to convert Ag ammonia complexes into Ag nanoparticles. These nanoparticles were then grafted onto the surface of a CTA membrane. The entire modification process was conducted under alkaline conditions

• in an ammonia solution. When compared to the unmodified CTA membrane, the modified membrane exhibited comparable desalination performance. Specifically, for 1.5 g·L−1 brackish water under 6 MPa pressure, the modified membrane achieved a water flux of approximately 21.06 L·m−2·h−1 and a retention rate

• )), trifluoromethanesulfonic acid (99.5%), and AgNO3 (0.1 mol·L−1 in H2O) were all sourced from Aladdin Chemical Reagent Co., Ltd (Shanghai, China). Ammonia was obtained from Harbin Dongfang Chemical Reagent Co., Ltd. All chemical reagents were utilized as received without further purification. Bacillus cereus, Bacillus

Better together: biomimetic nanomedicines for high performance tumor therapy

• Imran Shair Mohammad,
• Gizem Kursunluoglu,
• Anup Kumar Patel,
• Hafiz Muhammad Ishaq,
• Cansu Umran Tunc,
• Dilek Kanarya,
• Mubashar Rehman,
• Omer Aydin and
• Yin Lifang

Beilstein J. Nanotechnol. 2025, 16, 1246–1276, doi:10.3762/bjnano.16.92

• asymmetrical catalysis of urea to ammonia acts as a gas jet to propel the microrobots to the desired site of action [54]. 1.2 Lipoprotein-based biomimetic nanoparticles Lipoproteins are complex structures with a lipid core, usually cholesterol esters and triglycerides, surrounded by a monolayer of

Electronic and optical properties of chloropicrin adsorbed ZnS nanotubes: first principle analysis

• Prakash Yadav,
• Boddepalli SanthiBhushan and
• Anurag Srivastava

Beilstein J. Nanotechnol. 2025, 16, 1184–1196, doi:10.3762/bjnano.16.87

• and a pulmonary toxicant, CP exhibits potent lachrymatory and ocular irritant properties. Its degradation products, including chlorine, phosgene, nitric oxides, and ammonia, contribute to its toxicity by causing severe pulmonary and ocular damage [5]. Exposure to CP, as depicted in Figure 1, can

• ][43][44][45]. Previous studies have demonstrated the gas-sensing capabilities of ZnS NTs. Khan et al. [40] investigated ZnS NTs as sensors for ammonia and phosphine using density functional theory (DFT) to analyze adsorption behavior. Zhang et al. [46][47] reported that ZnS NTs exhibit superior

Crystalline and amorphous structure selectivity of ignoble high-entropy alloy nanoparticles during laser ablation in organic liquids is set by pulse duration

• Robert Stuckert,
• Felix Pohl,
• Oleg Prymak,
• Ulrich Schürmann,
• Christoph Rehbock,
• Lorenz Kienle and
• Stephan Barcikowski

Beilstein J. Nanotechnol. 2025, 16, 1141–1159, doi:10.3762/bjnano.16.84

• , compositionally complex alloys, derived from the critical view of the high-entropy effect [1]. The symbiosis of multiple elements leading to potential highly effective properties was already shown in energy applications [13], particularly in the field of heterogeneous catalysis, boosting efficiencies in ammonia

Piezoelectricity of hexagonal boron nitrides improves bone tissue generation as tested on osteoblasts

• Sevin Adiguzel,
• Nilay Cicek,
• Zehra Cobandede,
• Feray B. Misirlioglu,
• Hulya Yilmaz and
• Mustafa Culha

Beilstein J. Nanotechnol. 2025, 16, 1068–1081, doi:10.3762/bjnano.16.78

• was synthesized using boric acid (Sigma-Aldrich, Germany) and ammonia as the boron and nitrogen sources. Specifically, 1 gram of boric acid was mixed with 5 mL of 25% aqueous ammonia solution (Sigma-Aldrich, Germany) to create a suspension, which was then poured onto a silicon carbide (SiC) plate

• (Civelek Porselen, Turkey) and dried at 100 °C for 15 min. The plate was subsequently placed in a tubular furnace (Protherm, PTF 14/50/450) and heated to 1300 °C at a rate of 8 °C/min under an ammonia atmosphere for 2 h. After cooling to approximately 570 °C, the hBN material was gently scraped from the

Supramolecular hydration structure of graphene-based hydrogels: density functional theory, green chemistry and interface application

• Hon Nhien Le,
• Duy Khanh Nguyen,
• Minh Triet Dang,
• Huyen Trinh Nguyen,
• Thi Bang Tam Dao,
• Trung Do Nguyen,
• Chi Nhan Ha Thuc and
• Van Hieu Le

Beilstein J. Nanotechnol. 2025, 16, 806–822, doi:10.3762/bjnano.16.61

• then sonicated for 15 min. A volume of 500 mL of the as-prepared GO/Zn2+ dispersion was dropped into the 500 mL SG dispersion. The mixture was agitated for 15 min and sonicated for 15 min. Then, the reaction was adjusted to pH 10 using ammonia solution for Zn(OH)2 precipitation and kept stirring for 1

• exhibited sharp characteristic peaks of the Zn(OH)2 crystal at 2θ = 20.2°, 20.94°, 25.07°, 27.23°, 27.83°, and 32.97° [40][41][42]. Zinc hydroxide nanocrystals (ZH) were formed on the nanocomposite during the precipitation by alkaline ammonia in the synthesis process (see Methods section). The constituents

Modeling and simulation of carbon-nanocomposite-based gas sensors

• Roopa Hegde,
• Punya Prabha V,
• Shipra Upadhyay and
• Krishna S B

Beilstein J. Nanotechnol. 2025, 16, 90–96, doi:10.3762/bjnano.16.9

• , its composites, and their application in electrochemical sensors have been discussed [6][7][8]. There are research contributions on pristine graphene and ammonia gas sensors for detection of very low ammonia content [9]. The thin-film sensor fabricated on polyethylenimine- (PEI) functionalized SWCNTs

Dual-functionalized architecture enables stable and tumor cell-specific SiO₂NPs in complex biological fluids

• Iris Renata Sousa Ribeiro,
• Raquel Frenedoso da Silva,
• Romênia Ramos Domingues,
• Adriana Franco Paes Leme and
• Mateus Borba Cardoso

Beilstein J. Nanotechnol. 2024, 15, 1238–1252, doi:10.3762/bjnano.15.100

• of 50:1 (dye: APTES) in absolute ethanol under nitrogen. The resulting solution was continuously stirred for 24 h. The conjugate was then hydrolyzed in a basic ethanolic solution with TEOS and catalyzed by ammonia. In summary, the dye precursor (0.1 mL) was added to ethanol (120.0 mL), TEOS (2.0 mL

• ), and ammonia solution (6.1 mL), and the resulting mixture was stirred for 3 h. Afterward, the conjugate and TEOS were added at the same concentrations as described above, and the reaction was stirred overnight. The NPs were centrifuged (10000 rpm, 15 min), followed by a single wash with ethanol and

• four washes with deionized water. Finally, they were re-dispersed in 120.0 mL of water. After, a silica shell was synthesized around the preformed fluorescent core by the addition of ethanol (60.0 mL), ammonia solution (1.4 mL), and TEOS (1.7 mL). The addition of TEOS was done at a rate of 1.0 mL per

Synthesis, characterization and anticancer effect of doxorubicin-loaded dual stimuli-responsive smart nanopolymers

• Ömür Acet,
• Pavel Kirsanov,
• Burcu Önal Acet,
• Inessa Halets-Bui,
• Dzmitry Shcharbin,
• Şeyda Ceylan Cömert and
• Mehmet Odabaşı

Beilstein J. Nanotechnol. 2024, 15, 1189–1196, doi:10.3762/bjnano.15.96

• our case we observed a release reaching a plateau after 12 h (Figure 4B). Also, it was found that in cancer cells in mice, ammonium/ammonia levels in tumor lesions are in the millimolar range, higher than in the blood plasma. Using tumor cells in culture, the authors showed that Doxil in the presence

• of ammonia killed tumor cells on a level similar to that of free doxorubicin. Doxil without ammonia and ammonia without Doxil had a very poor cytotoxicity [40]. We obtained similar results. After 96 h of incubation, the effect of DOX-SNPs on HeLa cells at 5 µmol/L (i.e., 52% ± 7%) was comparable to

Water-assisted purification during electron beam-induced deposition of platinum and gold

• Cristiano Glessi,
• Fabian A. Polman and
• Cornelis W. Hagen

Beilstein J. Nanotechnol. 2024, 15, 884–896, doi:10.3762/bjnano.15.73

• [26][27], and ammonia [28][29], as a mixture of argon and oxygen [30][31], or in an oxygen plasma [32][33]. The success of these purification attempts varies considerably depending on the chemical nature of the precursor and the reactant gas. When using an oxidant gas reactant, such as water or oxygen

• reported attempts of electron beam-assisted purification of Au and Pt deposits using an oxidant gas reactant is presented. Ammonia has been also applied as a gas reactant for post-deposition purification of ruthenium FEBID deposits, causing the substitution of the deposited carbon with nitrogen. No

Laser synthesis of nanoparticles in organic solvents – products, reactions, and perspectives

• Theo Fromme,
• Sven Reichenberger,
• Katharine M. Tibbetts and
• Stephan Barcikowski

Beilstein J. Nanotechnol. 2024, 15, 638–663, doi:10.3762/bjnano.15.54

• nanoparticles [75][76]. Beyond the formation of carbon monoxide, the direct reduction of permanent solutes in liquids via LRL, sometimes termed laser bubbling in liquid (LBL), has been demonstrated recently for alternative reactants, such as hydrogen extraction from ammonia [77] or methanol [78], and direct

Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites

• Nghiem Thi Thuong,
• Le Dinh Quang,
• Vu Quoc Cuong,
• Cao Hong Ha,
• Nguyen Ba Lam and
• Seiichi Kawahara

Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16

• of NR composite. The usage of GO-VTES may be suitable for the preparation of NR composites for tire applications as the composite may reduce water permeability and enhance the abrasion resistance of commercial products [30]. Experimental Materials The natural rubber used in this work is high-ammonia

Silver-based SERS substrates fabricated using a 3D printed microfluidic device

• Phommachith Sonexai,
• Minh Van Nguyen,
• Bui The Huy and
• Yong-Ill Lee

Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65

• from Krackeler Scientific (USA). Methyl alcohol, hydrogen peroxide (35%), sodium hydroxide (<97%), ammonia water (25–29%), acetone (99.5%), ethyl alcohol (95%), and 2-propanol (99.5%) were bought from Daejung (Republic of Korea). The Formlabs 3D printer and clear V4 resin were purchased from Formlabs

The microstrain-accompanied structural phase transition from h-MoO₃ to α-MoO₃ investigated by in situ X-ray diffraction

• Zeqian Zhang,
• Honglong Shi,
• Boxiang Zhuang,
• Minting Luo and
• Zhenfei Hu

Beilstein J. Nanotechnol. 2023, 14, 692–700, doi:10.3762/bjnano.14.55

• to form large one-dimensional tunnels with a diameter of ca. 3 Å [21]. The tunnel permits the intercalation of cations, water molecules, and ammonia, which leads to better photophysical and photochemical capabilities of h-MoO3 compared to the other MoO3 structures [17][22]. However, there are still

Biocatalytic synthesis and ordered self-assembly of silica nanoparticles via a silica-binding peptide

• Mustafa Gungormus

Beilstein J. Nanotechnol. 2023, 14, 280–290, doi:10.3762/bjnano.14.25

• condensation polymerization of the hydrolyzed precursor. Once colloidally stable nuclei form, growth ensues through monomer addition or coalescence and Ostwald ripening. The reactions involved in the Stöber process are described as follows: where Equation 2 is the ionization of the ammonia, Equation 3 is the

Solvent-induced assembly of mono- and divalent silica nanoparticles

• Bin Liu,
• Etienne Duguet and
• Serge Ravaine

Beilstein J. Nanotechnol. 2023, 14, 52–60, doi:10.3762/bjnano.14.6

• similar way from 55 ± 2 nm silica nanoparticles which were functionalized with MMS at 0.5 funct./nm2. Controlled growth of the silica core According to the procedure reported in [30], 9.1 mL of absolute ethanol, 0.7 mL of ammonia, and 0.2 mL of the dispersion of monopods (1.8 × 1016 part/L) or bipods (1.8

• absolute ethanol. After 2 cycles of centrifugation (12,000g; 5 min) and redispersion in absolute ethanol, the nanoparticles were finally redispersed in 10 mL of a previously prepared hydroalcoholic solution (absolute ethanol/ammonia/water, volume ratio: 91%:7%:2%). This protocol was renewed to obtain the

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

• synthesize hydrophilic CDs [92]. Aqueous ammonia was used as a nitrogen dopant for many natural source materials such as Hylocereus undatus (H. undatus), Chionanthus retusus (C. retusus), Phyllanthus emblica (P. emblica), and Phyllanthus acidus (P. acidus) to obtain N-CDs [93][96]. A good QY up to 31.7% was

• honey, garlic, and ammonia as green source, sulfur source, and nitrogen source, respectively to prepare N,S-CDs via a simple hydrothermal technique. The Z-scan methodology was used for non-linear optical characterization and the agar well diffusion methodology was used to explore the antimicrobial

Solar-light-driven LaFe_xNi_1−xO₃ perovskite oxides for photocatalytic Fenton-like reaction to degrade organic pollutants

• Chao-Wei Huang,
• Shu-Yu Hsu,
• Jun-Han Lin,
• Yun Jhou,
• Wei-Yu Chen,
• Kun-Yi Andrew Lin,
• Yu-Tang Lin and
• Van-Huy Nguyen

Beilstein J. Nanotechnol. 2022, 13, 882–895, doi:10.3762/bjnano.13.79

• were lanthanum nitrate hexahydrate (99.9%, La(NO3)3·6H2O, Alfa Aesar), ferric nitrate nonahydrate (≥98.0%, Fe(NO3)3·9H2O, J.T. Baker), and nickel nitrate hexahydrate (98.0%, Ni(NO3)2·6H2O, Showa), respectively. The citric acid (95.0%, C6H8O7) and ammonia (28.0–30.0%, NH4OH) were both obtained from J.T

• brown color. The pH value was adjusted to pH 0 or pH 7 with ammonia (NH4OH). The total volume of the brown solution was controlled at 100 mL, followed by being heated at 110 °C for 60 min with continuous stirring to remove water. Citric acid acted as a chelating agent during the dehydration process, so

Modeling a multiple-chain emeraldine gas sensor for NH₃ and NO₂ detection

• Hana Sustkova and
• Jan Voves

Beilstein J. Nanotechnol. 2022, 13, 721–729, doi:10.3762/bjnano.13.64

• -equilibrium Green’s functions formalism. The numerical results are compared with experimental data of ammonia and nitrogen dioxide detection. Multiple molecules of PANI in the form of emeraldine salt were studied with more than one absorbed molecule of ammonia or nitrogen dioxide. From the I–V characteristics

• good properties for NO2 detection. Keywords: ammonia; gas sensor; nitrogen dioxide; numerical computation; polyaniline; Introduction Polyaniline is a conducting polymer consisting of benzene rings connected by nitrogen units, which can be used in a wide spectrum of applications, for example, dyes for

• it shows a resistance change when gas molecules are in the vicinity of the chain. Interesting for this application could be the detection of NH3 or NO2 [5]. Mechanism of Gas Sensing When gas molecules interact with the PANI chain, the resistance of the bulk material changes. For example, ammonia gas

A chemiresistive sensor array based on polyaniline nanocomposites and machine learning classification

• Jiri Kroutil,
• Alexandr Laposa,
• Ali Ahmad,
• Jan Voves,
• Vojtech Povolny,
• Ladislav Klimsa,
• Marina Davydova and
• Miroslav Husak

Beilstein J. Nanotechnol. 2022, 13, 411–423, doi:10.3762/bjnano.13.34

• 1999/2, 182 21 Prague, Czech Republic 10.3762/bjnano.13.34 Abstract The selective detection of ammonia (NH3), nitrogen dioxide (NO2), carbon oxides (CO2 and CO), acetone ((CH3)2CO), and toluene (C6H5CH3) is investigated by means of a gas sensor array based on polyaniline nanocomposites. The array

• data by principal component analysis to be a highly accurate method reach to 99% of the classification of six different gases. Keywords: feature extraction; gas sensor; pattern recognition; sensor array; Introduction The control and monitoring of toxic gaseous substances, such as ammonia, nitrogen

• between VOCs, supported by a vector machine to distinguish between acetone, nitrogen dioxide, and ammonia, and by a neutral network model to distinguish between ammonia and formaldehyde gas [7][8][9]. In our previous work [10], we demonstrated a combination of organic (polyaniline, PANI) and inorganic

Morphology-driven gas sensing by fabricated fractals: A review

• Vishal Kamathe and
• Rupali Nagar

Beilstein J. Nanotechnol. 2021, 12, 1187–1208, doi:10.3762/bjnano.12.88

• , carbon monoxide, ammonia, nitrous oxide, and ethanol (Figure 10e,f) at 250 °C. The estimated fractal dimensions were 1.82 for the pore network and 1.72 for the foam sensor. Titanium oxide-based fractals Fusco et al. modified dielectric titanium oxide (TiO2) nanoparticles with fractal structure with a

• . The response of sensor was described by the real and imaginary parts of the reflection coefficient using a specific waveguide. The response was found to be linear for ammonia in the range of 0–500 ppm. Zinc oxide-based fractals Hierarchical dandelion-like hollow ZnO structures were reported by Fan et

• branches. The dendritic nanostructure allowed the network passage for electron transfer after ammonia molecules interact with the sensing surface. It showed an about 5–8 times enhanced response and an improvement in recovery time by about 30–50 times compared to a pristine NiO sensor. The sensor also

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

• upon addition of ammonia solution (Figure 1). NOR was loaded onto the IONPs at pH 5 or pH 10 and the nanoparticles were subsequently analyzed. It was noted that the efficacy of NOR against Mycobacterium smegmatis remained unaffected by a change of pH, to either pH 5 or pH 10 (Supporting Information

• the treatment of intracellular pathogens. Experimental Reagents FeCl2·4H2O, FeCl3·6H2O and NOR used in the nanoparticle synthesis were purchased from Sigma-Aldrich, Germany. 25% ammonia solution was purchased from Merck, Germany (GR grade). RPMI-1640 and fetal bovine serum (FBS) used for the culturing

• synthesized by co-precipitation of ferrous and ferric chloride salts [47]. An aqueous solution of Fe2+:Fe3+, taken in the molar ratio of 1:2, was stirred at 700 rpm with nitrogen purging, for 10 min, at 80 °C. The reduction to Fe3O4 was carried out with the addition of 15 mL of 25% ammonia solution. Stirring