Science topic

# Colloids - Science topic

Two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out. The dispersing or continuous phase or medium envelops the particles of the discontinuous phase. All three states of matter can form colloids among each other.
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Lead chalcogenide colloidal quantum dots (CQDs) are regarded as attractive absorption materials for novel solar cells (SCs). The cost of lead chalcogenide CQD has been decreased to a commercialization target of 5/g due to the direct production of CQD inks. However, the photoelectric conversion efficiency (PCE) of lead chalcogenide CQDSCs is presen... Article Full-text available Nanomaterial additives have been broadly used in different applications to enhance the energy output of energetic materials. Herein, the carbon nanosized fibrous surfaces (CNF) were subjected to a pretreatment process followed by catalysis to ensure the successful deposition of a thin layer of nano-copper. The obtained Cu-coated layer was then galv... Article Full-text available We present a method to directly visualise a statistical analysis of skyrmion defect alignment at grain boundaries in the skyrmion host $$\hbox {Cu}_2$$ Cu 2 OSeO 3 . Using Lorentz transmission electron microscopy, we collected large data sets with several hundreds of frames containing skyrmion lattices with grain boundaries in them. To address the... Article Full-text available Semi-conducting nanoplatelets are two-dimensional nanoparticles whose thickness is in the nanometer range and controlled at the atomic level. They have come up as a new category of nanomaterial with promising optical properties due to the efficient confinement of the exciton in the thickness direction. In this perspective, we first describe the var... Article Full-text available We present a single-step, room-temperature synthesis of fluorescent organosilica nanobeads (FOS NBs). The FOS NBs were synthesized under aqueous conditions using (3-aminopropyl)triethoxysilane (APTES) as the silicon source in the presence of l -ascorbic acid (L-AA). In the APTES/L-AA/water ternary phase, the hydrolysis and condensation reaction of... Article Full-text available Dietary Fibre Concentrate (DFC) derived from vegetables side streams obtained during industrial processing can be exploited as a fibre-rich food ingredient. In this study, colloid milling was investigated as an environmentally-friendly physical method to improve the functional properties of asparagus DFC. Functional properties such as swelling capa... Experiment Findings Full-text available Winey has shown consistent effects on the use of torsion fields to increase Zeta Potential, including most recently, the expanded gelation of chia seeds in torsion field-exposed water. One apparent exception to this enhanced hydrophilic effect is the greater uptake of water from control samples of whole milk (a colloid) into hydrophilic polymers (P... Article Full-text available The anisotropy of magnetic susceptibility of ferrofluid‐impregnated samples is an efficient and powerful proxy for pore space anisotropy and preferred flow directions. One of the main assumptions in pore fabric studies is that all pores >10–20 nm are homogeneously filled with ferrofluid, and that the ferrofluid has constant properties throughout th... Article Full-text available The aim of the study was to determine the influence of homogenization and buttermilk powder addition on the dispersion of milk fat globules, viscosity and heat stability (HS) of milk. Milk was treated by high-pressure homogenization (HPH, 100 MPa, temperatures 4, 20, 40, 60 °C), as well as conventional homogenization (20 MPa, temperature 60 °C). Bu... Article Full-text available The slow decomposition kinetics of Li2O2 and the accumulation of by-products resulted in the passivation of cathode is one of the key issues restricting the development of Li-O2 batteries. Herein, ultrafine Pd nanoparticles (with an average particle size of 2.23 nm) capped by mercaptosuccinic acid (MSA) dispersed in 1.0 M LiClO4/DMSO as colloidal e... Article Full-text available In this paper, the silicon carbide (SiC) nanoparticle colloidal solution is obtained by using the femtosecond (fs) laser ablation in deionized water. The spherical nanoparticles are uniform in size with an average diameter of 2.84 nm analyzed by transmission electron microscope (TEM). X-ray diffraction patterns (XRD) show that the crystal structure... Article Full-text available Packing problems are abundant in nature and have been researched thoroughly both experimentally and in numerical models. In particular, packings of anisotropic, elliptical particles often emerge in models of liquid crystals, colloids, and granular and jammed matter. While most theoretical studies on anisotropic particles have thus far dealt with pa... Article Full-text available Living organisms employ chemical self-organization to build structures, and inspire new strategies to design synthetic systems that spontaneously take a particular form, via a combination of integrated chemical reactions, assembly pathways and physicochemical processes. However, spatial programmability that is required to direct such self-organizat... Article Full-text available A conventional aqueous electrolyte is a crucial component of zinc-ion batteries providing an ion conductive medium. However, the monofunction of a liquid electrolyte cannot bear any external load. With regard to applications in electric vehicles and stationary energy storage devices, complicated battery packing materials are required to improve the... Article Full-text available It was investigated the influence of hydrocortisone (40 mg/kg b wt) on bile secretion of acute experiment on rats. It was estimated that this hormone promoted increasing of bile acids conjugation with taurin and glycine in rat hepatocytes and provided a minor choleretic effect. It should be indicated that loading of mentioned dose improve solubilis... Article Full-text available During the exploitation of deep and ultradeep oil and gas resources, the high-temperature problem of deep reservoirs has become a major challenge for water-based drilling fluids. In this study, a novel high-temperature-resistant filtrate reducer (LDMS) with low molecular weight was synthesized using N, N-dimethylacrylamide; sodium p-styrene sulfona... Article Full-text available Colloidal assembly is a key strategy in nature and artificial device. Hereby, an electromicrofluidic assembly platform (eMAP) is proposed and validated to achieve 3D colloidal assembly and manipulation within water droplets. The water-in-oil emulsion droplets autoposition in the eMAP driven by dielectrophoresis, where the (di)electrowetting effect... Article Full-text available In the realm of particle self-assembly, it is possible to reliably construct nearly arbitrary structures if all the pieces are distinct1–3, but systems with fewer flavours of building blocks have so far been limited to the assembly of exotic crystals4–6. Here we introduce a minimal model system of colloidal droplet chains⁷, with programmable DNA in... Preprint Full-text available Colloidal syntheses of nanomaterials offer multiple benefits to study, understand and optimize un-supported and supported catalysts. In particular, colloidal syntheses are relevant to synthetize (precious) metal nanoparticles. By separating the synthesis of the active phase nanoparticles from supporting steps, a deeper knowledge and a rational cont... Article Full-text available Colloidal gels under constant moderate stress flow only after a prolonged solid-like deformation. Predicting the time-dependent yielding of the gels would facilitate control of their mechanical stability and transport, but early detectable signs of such delayed solid-to-fluid transition remain unknown. We show that the shear rate of colloidal gels... Article Full-text available We present a theoretical atomistic study of the optical properties of non-toxic InX (X = P, As, Sb) colloidal quantum dot arrays for application in photovoltaics. We focus on the electronic structure and optical absorption and on their dependence on array dimensionality and surface stoichiometry motivated by the rapid development of experimental te... Article Full-text available Indium sulfide, a two-dimensional semiconductor material, has emerged as a promising candidate for cost-effective and sustainable solar cells. This report deals with the facile preparation of colloidal In2S3 with a new ultrathin nanosheet (NS) morphology. The synthesis was mediated through a new structurally characterized single source molecular pr... Article Full-text available Colloid supported lipid bilayers (CSLBs) are highly appealing building blocks for functional colloids. In this contribution, we critically evaluate the impact on lipid ordering and CSLB fluidity of inserted additives. We focus on poly(ethylene glycol) (PEG) bearing lipids, which are commonly introduced to promote colloidal stability. We investigate... Chapter Full-text available The dielectric spectra of colloidal systems and other dielectric media often contain a typical low frequency dispersion, which usually remains unnoticed, because of the presence of strong conduction losses. The KK relations offer a means for converting ε′ into ε′′ data. This allows us to calculate conduction free ε′′ spectra in which the l.f. dispe... Research Proposal Full-text available This study aims to analyze and model the behaviors of shear-thickening Dilatant non-Newtonian fluids in micro-g environment. A colloid's Dilatancy is dependent on its ratio of interparticle forces. Theories behind shear thickening behavior include (1) Hydroclustering and (2) Order to disorder transition. This lack of clarity in our understanding of... Article Full-text available Extraction of hydrocolloids from plant seeds is important due to the increased consumption of these compounds in the formulation of food products. Ultrasound-assisted extraction has become very popular due to its many advantages, one of the most important of which is to increase the extraction efficiency of the biopolymers. The aim of this research... Article Full-text available Chitosan oligosaccharides (COSs) are widely applied in many areas due to its various biological activities. Controllable preparation of COSs with desired degree of polymerization (DP) via suitable chitosanase is of great value. Herein, a novel glycoside hydrolase (GH) family 46 chitosanase (SlCsn46) from marine Streptomyces lydicus S1 was prepared,... Article Full-text available To investigate the effect of activated crumb rubber content on the molecular interactions and the properties of crumb rubber-modified asphalt (CRMA) with waste oil, six models of asphalt with various rubber dosages were developed using Materials Studio software, and the molecular dynamics performance of the system was further examined. Then, the fa... Article Full-text available Speckle metrology harnesses the interferometric properties of disordered light to achieve remarkable sensitivities. Often relying on time-domain analysis, it is rate-limited by the acquisition of speckle images. In the present work instead, we use a frequency-domain approach which spans 8 to 10 frequency decades up to 100 MHz, and reveals minute ch... Preprint Full-text available Experiment, theory, and simulation are employed to understand the dispersion of colloidal particles in a periodic array of oscillating harmonic traps generated by optical tweezers. In the presence of trap oscillation, a non-monotonic and anisotropic dispersion is observed. Surprisingly, the stiffest traps produce the largest dispersion at a critica... Article Full-text available As the key connecting points in the neuromorphic computing systems, synaptic devices have been investigated substantially in recent years. Developing optoelectronic synaptic devices with optical outputs is becoming attractive due to many benefits of optical signals in systems. Colloidal quantum dots (CQDs) are potential luminescent materials for in... Article Full-text available A cost‐effective and high‐efficiency photoelectrochemical (PEC) water splitting system based on colloidal quantum dots (QDs) represents a potential solar‐to‐hydrogen (STH) conversion technology to achieve future carbon neutrality. Herein, a self‐biased PEC cell consisting of BiVO4 photoanode and Cu2O photocathode both decorated with Zn‐doped CuInS2... Preprint Full-text available We use a nonequilibrium variational principle to optimize the steady-state, shear-induced interconversion of self-assembled nanoclusters of DNA-coated colloids. Employing this principle within a stochastic optimization algorithm allows us to discover design strategies for functional materials. We find that far-from-equilibrium shear flow can signif... Article Full-text available In this work, a method to determine Pb(II) ions in model water is presented; the method is based on the fluorescence emission of a silver nanoclusters (AgNCs) colloidal solution, which is sensitive to lead ions. The presence of Pb(II) ions causes a photoemission enhancement of the AgNCs solution dependent on the pollutant concentration. The functio... Preprint Full-text available The complex internal structure of the solute molecules involved in biomolecular processes necessitates the characterization of the forces between charged macromolecules beyond the point-ion description. In this article, we develop a functional integral theory of like-charged membrane interactions in liquids composed of structured ions modeled as ch... Article Full-text available Colloidal liquid crystals are an emerging class of soft materials that naturally combine the unique properties of both liquid crystal molecules and colloidal particles. Chiral liquid crystal blue phases are attractive for use in fast optical displays and electrooptical devices, but the construction of blue phases is limited to a few chiral building... Preprint Full-text available We present a simple and systematic procedure to determine the effective dynamics of a Brownian particle coupled to a rapidly fluctuating correlated medium, modeled as a scalar Gaussian field, under spatial confinement. The method allows us, in particular, to address the case in which the fluctuations of the medium are suppressed in the vicinity of... Article Full-text available The assembly of two different kinds of colloidal particle-based photonic structures into an individual micro-object can achieve multifunctionality. In this study, core–shell photonic microcapsules with dual structural colors and photonic stop bands were prepared through a standard microfluidic technique. Photocurable resin suspension of silica nano... Article Full-text available We describe a method for deriving surface functionalization patterns for colloidal systems that can induce self-assembly into any chosen periodic symmetry at a planar interface. The result is a sequence of letters, s ∈ {A,T,C,G}, or a gene, that describes the perimeter of the colloidal object and programs its self-assembly. This represents a genome... Preprint Full-text available In this article, we study numerically the dispersion of colloids in a two-dimensional cellular flow in the presence of an imposed mean salt gradient. Owing to the additional scalar, the colloids do not follow exactly the Eulerian flow field, but have a (small) extra-velocity proportional to the salt gradient,\mathbf{v}_\mathrm{dp}=\alpha\nabla S\$...
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This article deals with the electrophoresis of a charged hydrophobic spherical rigid colloid in the extent of general electrolyte. To show the impact of electrolyte ions of the background aqueous medium on the overall electrophoretic transport of hydrophobic colloids, we have considered various electrolyte solutions, including 1:1, 2:2, 3:3, 2:1, 3...
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Soft Glassy Materials (SGM) consist in dense amorphous assemblies of colloidal particles of multiple shapes, elasticity, and interactions, which confer upon them solid-like properties at rest. They are ubiquitously encountered in modern engineering, including additive manufacturing, semi-solid flow cells, dip-coating, adhesive locomotion, where the...
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Nanosilver solutions of colloidal silver nanoparticles at reasonable price, good quality, and availability are increasingly demanded for the application in agriculture and aquaculture for the prevention and treatment of diseases. In this paper, we have applied a new simple and environmental-friendly fabrication method based on a plasma electrochemi...
Preprint
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In different solution-based approaches, atoms amalgamate at an electronically flat solution surface. Atoms amalgamate on dissociation from the precursor. The developing tiny-shaped particles form the building blocks of bigger-sized particles. Tiny particles of triangular shape developed when the pulses supplied the nano energy packets. On developme...
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Reliable gas sensors are very important for hydrogen (H2) gas detection and storage. Detection methods based on palladium (Pd) metal are cost-effective and widely studied. When Pd is exposed to H2, it turns into palladium hydride with modified optical properties, which thus can be monitored for H2 sensing. Here, we fabricated large-area Pd nanostru...
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The present work introduces a simple, electrostatically driven approach to engineered nanomaterial built from the highly cytotoxic [Au2L2]2+ complex (Au2, L = 1,5-bis(p-tolyl)−3,7-bis(pyridine-2-yl)−1,5-diaza-3,7-diphosphacyclooctane (PNNP) ligand) and the pH-sensitive red-emitting [{Re6Q8}(OH)6]4− (Re6-Q, Q = S2− or Se2−) cluster units. The proton...
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Emulsions have a range of applications, for example, in cosmetics, pharmaceuticals, and food. However, the surfactants used to prepare such emulsions can often be toxic to humans and the environment and also affect the oil properties of emulsions. Therefore, interest in surfactant-free emulsions has increased in recent years. One method to enhance...
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The unavailability of energy has become a major challenge to industry in the last years, as an important percentage of the generated energy is dissipated as heat in transport. Since heat transfer processes are irreversible, the role of entropy generation minimization in nanofluid flow and heat transfer cannot be neglected. The present paper was ded...
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Colloidal quantum dots (CQDs) as photodetector materials have attracted much attention in recent years due to their tunable energy bands, low cost, and solution processability. However, their intrinsically low carrier mobility and three-dimensional (3D) confinement of charges are unsuitable for use in fast-response and highly sensitive photodetecto...
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En la experiencia educativa Fisicoquímica, impartida en la Facultad de Bioanálisis de la Universidad Veracruzana, se ha utilizado la gamificación para el desarrollo de un escape room a través de la herramienta en línea Genially. La innovación educativa consistió en presentar al estudiante un repaso de los temas "Fenómenos de superficie y estado col...
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The simultaneous emergence of active turbulence and odd viscosity for a colloidal rotors system is here shown. Rod-like colloidal particles with a ferromagnetic head and magnetic moment perpendicular to the rod axis, precess vertically to the substrate under an externally rotating field. The colloid rotation drags the adjacent fluid inducing the tr...
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The influence of microstructure and processing route on the small-scale mechanical response as well as on the deformation and failure mechanisms of Ti(C,N)-FeNi cermets were investigated by uniaxial compression of micropillars milled by focused ion beam with different sizes. Stress-strain curves were determined and associated deformation mechanisms...
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Designing polytypic homojunction is an efficient way to regulate photogenerated electrons and holes, thereafter bringing desired physical and chemical properties and being attractive photocatalysts for solar-to-hydrogen conversion. However, the high-yield and controllable synthesis of well-defined polytypes especially for multinary chalcogenide - t...
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This study aimed to clarify the mechanism of the effect of surface charge of clay particles on the separation pressure between adjacent frozen clay particles. A general mathematical model of separation pressure between adjacent spherical clay particles was given based on the extended colloidal stability (DLVO) theory; it was introduced into the fro...
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We study the modifications of near-field radiative energy transfer caused by residual charges, which are common in MEMS/NEMS, colloid solutions and lunar dusts etc. Besides the well-known resonant modes (surface polariton and localized surface polariton), the residual charges give rise to an additional temperature-dependent mode providing a new hea...