An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Our recent Communication suggested that ammonia in aqueous solution may preferentially destabilize large cages in methane clathrate hydrates. A Comment favored ammonia incorporation instead, but it did not accurately describe our proposed mechanism and relied primarily on studies conducted in different chemical systems and/or which used other preparation methods. ...
... Self-assembled organothiol is a well-known process to endow specific protective properties and usually involves passive incubation. Researchers have recently confirmed that the potential-assisted method is more selective and faster than the passive method. This paper provides an original and promising approach for Cu protection by 2-mercaptobenzobthiazole (MBT) assembled film prepared from an aque ...
aqueoussolutions, etc ; computers; dissociation; solvents; Show all 4 Subjects
Abstract:
... We study NaCl ion-pair dissociation in a dilute aqueous solution using computer simulations both for the full system with long-range Coulomb interactions and for a well-chosen reference system with short-range intermolecular interactions. Analyzing results using concepts from Local Molecular Field (LMF) theory and the recently proposed AI-based analysis tool “State predictive information bottlenec ...
aqueoussolutions, etc ; deformation; evaporation; oils; silica; Show all 5 Subjects
Abstract:
... The effects of ion concentration on the deformation and coalescence of particle-stabilized oil droplets dispersed in water were investigated. We emulsified a mixture of oil and an aqueous solution of silica particles with various NaCl concentrations ranging from 0 M to 3 M. Oil droplets were spontaneously compressed by evaporation of the water phase. At low ion concentrations (< 0.1 M), the drople ...
aqueoussolutions, etc ; carbon; electrosynthesis; green chemistry; Show all 4 Subjects
Abstract:
... A novel, environmentally friendly electrocatalytic process has been developed to prepare α,α-gem-dihalide (F, Cl, and Br) ketones from α-mono-halide ketones in an aqueous solution containing alkali halide salts. The gem-dihalides could have the same or different halogens on the same carbon, depending on the reactant and inorganic halide salt used. An electron-withdrawing group, such as carbonyl, l ...
aqueoussolutions, etc ; adhesion; alloys; corrosion; electroplating; entropy; Show all 6 Subjects
Abstract:
... CoNiWReP high entropy alloy (HEA) coatings have been prepared in aqueous solution using direct current (DC) and pulse current (PC) electrodeposition technologies. The prepared amorphous HEA coatings are silver-white in appearance and have good adhesion to the substrate. The coatings prepared by PC are dense and suitable for engineering purpose. The HEA coatings have a cathodic protection effect fo ...
aqueoussolutions, etc ; encapsulation; fluorescence; indigo; indigo carmine; Show all 5 Subjects
Abstract:
... We show that the optical properties of indigo carmine can be modulated by encapsulation within a coordination cage. Depending on the host/guest molar ratio, the cage can predominantly encapsulate either one or two dye molecules. The 1 : 1 complex is fluorescent, unique for an indigo dye in an aqueous solution. We have also found that binding two dye molecules stabilizes a previously unknown confor ...
aqueoussolutions, etc ; absorption; quartz; refractive index; silicon; Show all 5 Subjects
Abstract:
... We successfully obtained transfer ribonucleic acid (tRNA) thin solid films (TSFs) using an aqueous solution precursor in an optimized deposition process. By varying the concentration of RNA and deposition process parameters, uniform solid layers of solid RNA with a thickness of 30 to 46 nm were fabricated consistently. Linear absorptions of RNA TSFs on quartz substrates were experimentally investi ...
aqueoussolutions, etc ; blood serum; fluorescence; formaldehyde; moieties; Show all 5 Subjects
Abstract:
... Formaldehyde is an abundant contaminant in food and environments causing various diseases. Thus, the development of fast, simple, and selective formaldehyde detection is of great interest. Herein, novel quinolizinium-based fluorescent probes were designed based on a 2-aza-Cope rearrangement reaction and showed high selectivity to formaldehyde by fluorescence emission shift. We successfully reduced ...
aqueoussolutions, etc ; adsorption; boron; neural networks; toxicity; Show all 5 Subjects
Abstract:
... Continuous removal of toxic element boron from aqueous solution was investigated with new phenolic hydroxyl modified resin (T-resin) using a fixed bed column reactor operated under various flow rates, bed height and influent concentrations. The breakthrough time, exhaustion time and uptake capacity of the column bed increased with increasing column bed height, whereas decreased with increasing inf ...
aqueoussolutions, etc ; analytical chemistry; electrophoresis; pH; paper; stilbenes; Show all 6 Subjects
Abstract:
... This work presents the new-generation terminating electrolyte for isotachophoresis analysis of stilbene derivatives. The terminating electrolyte used was the aqueous solution of 4,4ʹ-bis[(1-morpholiniomethyl)spirobi(1-sila-2,5-dioxacyclopentan-3-on)at]. Stilbene derivatives were used as test substances. In order to be able to use the new terminating electrolyte, the researchers developed a new met ...
aqueoussolutions, etc ; ambient temperature; coordination polymers; fluorescein; phosphorescence; Show all 5 Subjects
Abstract:
... An aqueous room-temperature phosphorescent (RTP) probe for Gd³⁺ is reported based on Gd³⁺-induced intersystem promoting effect and the oxygen-shielding property of the Gd³⁺/AMP/fluorescein coordination polymer nanoparticles (CPNs). Besides selective Gd³⁺ detection, the results are important for harnessing the advantages of RTP detection in an aerated aqueous solution, which is difficult with curre ...
aqueoussolutions, etc ; absorption; carbon dioxide; electrical conductivity; energy; Show all 5 Subjects
Abstract:
... The present paper reports the ratio of real chemical (rCACC) and physical (rCACP) CO₂ absorption capacity to total absorption capacity (CACT) at absorption time t in 0.01–0.05 mol/L (M) triethanolamine (TEA) and methyl-diethanolamine (MDEA) aqueous solution systems; this is calculated based on the directly measured electrical conductivity (ECₘ) of the solutions during the absorption time. Although ...
aqueoussolutions, etc ; activated carbon; adsorption; dyes; technology; toxicity; wastewater; Show all 7 Subjects
Abstract:
... Effective and low-cost removal of dye and heavy metals from wastewater still is a great challenge for researchers. Adsorption using activated carbon is widely used in removing these toxic pollutants. Physical, chemical, and biological modifications have been studied for improving activated carbon adsorption performance. Literature suggests that chemical modified activated carbon showed maximum ads ...
aqueoussolutions, etc ; drug carriers; heat treatment; hydrophobicity; ibuprofen; sugars; Show all 6 Subjects
Abstract:
... Amorphous solid dispersion (ASD) technique is promising to increase the dissolution of hydrophobic drug in aqueous solution systems, including in vivo. However, there is a serious lack of understanding of the impact of the molecular characteristics of a hydrophobic drug on the aqueous dissolution behavior of the drug from the ASD. This is because there are many structural differences between diffe ...
aqueoussolutions, etc ; crystallization; desalination; distillation; models; nanofibers; process design; Show all 7 Subjects
Abstract:
... Membrane wetting is a crucial issue in the desalination process by vacuum membrane distillation (VMD). However, the micromechanism of the wetting behavior is far from clear. Here, electrospun nanofiber membranes (ENMs) had been utilized to clarify the pore variations inside the membrane for desalination from NaCl aqueous solution, where the distinct open pore structure of ENMs could address the ch ...
aqueoussolutions, etc ; isomerization; moieties; nanobiotechnology; peptides; temperature; ultraviolet radiation; Show all 7 Subjects
Abstract:
... Herein, we describe the hierarchical self-assembly accompanying self-sorting of collagen-inspired peptides (CPs). The two amphiphilic CPs used in this study contained an azobenzene (Az) moiety at the N-terminal, connected through a flexible spacer, but with different lengths of the (Gly-Pro-Hyp)ₙ triplet (n = 5 and 7). When the CP aqueous solution (60 °C) was cooled to 4 °C, both CPs formed a trip ...
aqueoussolutions, etc ; calcium; desalination; hydrogels; ionic strength; ionization; seawater; Show all 7 Subjects
Abstract:
... We model a process of seawater desalination that employs compression of a weak polyelectrolyte hydrogel as the drawing force for ion transfer. We model seawater as an aqueous solution containing mono- and divalent ions, Na⁺, Cl–, and Ca²⁺. We demonstrate that the compression of hydrogel in equilibrium with a bath containing such a solution creates two types of ion flow. The first type is the excha ...
aqueoussolutions, etc ; catalysts; catalytic activity; oxygen; potassium; synergism; temperature; Show all 7 Subjects
Abstract:
... In order to enhance the catalytic performance of the Gd-modified Co₃O₄ catalyst (Gd₀.₀₆Co) for the N₂O decomposition, alkali metal K was introduced as the promoter by impregnating the Gd₀.₀₆Co powder with an aqueous solution of KNO₃ (with K/Co ratios 0.01–0.05). With the doping of K, the catalytic activity over Gd₀.₀₆Co was significantly improved and the temperature of N₂O complete decomposition w ...
aqueoussolutions, etc ; clay; halloysite; kaolinite; nanotubes; solvents; sucrose; thermogravimetry; Show all 8 Subjects
Abstract:
... In this work, we propose an easy strategy for the separation of halloysite/kaolinite mixtures in sucrose aqueous solution. Preliminarily, we investigated the influence of the sucrose addition on the colloidal stability of kaolinite nanoplates and halloysite nanotubes (HNTs) dispersed in water. Dynamic Light Scattering (DLS) measurements revealed that the HNTs aqueous mobility is dependent on the s ...