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PubMed Journals Articles About "Global Small Particle Size Colloidal Silica Market Research" RSS

11:42 EST 28th January 2020 | BioPortfolio

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Showing "Global Small Particle Size Colloidal Silica Market Research" PubMed Articles 1–25 of 42,000+

Silica fouling during groundwater RO treatment: The effect of colloids' radius of curvature on dissolution and polymerisation.

Silica fouling during groundwater reverse osmosis (RO) treatment can have a significant impact on filtration performance. To better understand this phenomenon, the equilibrium kinetics of amorphous colloidal silica were studied at conditions relevant to RO of silica-rich alkaline groundwater. The impact of particle size was investigated using synthetic monodisperse silica nanoparticles. Bench scale experiments were conducted by monitoring dissolved silica concentration of aqueous suspensions of colloids of ...


Colloidal particle aggregation in three dimensions.

Colloidal systems are of importance not only for everyday products, but also for the development of new advanced materials. In many applications, it is crucial to understand and control colloidal interaction. In this paper, we study colloidal particle aggregation of silica nanoparticles, where the data are given in a three-dimensional micrograph obtained by high-angle annular dark field scanning transmission electron microscopy (STEM) tomography. We investigate whether dynamic models for particle aggregatio...

Facile synthesis of mesoporous silica nanoparticles using modified sol-gel method: Optimization and in vitro cytotoxicity studies.

The present study describes the synthesis of mesoporous silica nanoparticles using a modified sol-gel method. Various proportions of acetonitrile-water mixtures were utilized so as to optimize the reaction mixture for facile synthesis of mesoporous silica nanoparticles with controlled particle size for the very first time. After carefully adjusting the water and acetonitrile contents i.e. to 1:1 v/v ratio, a more uniform and small sized nanoparticles were achieved. The resultant particles were 140 nm in siz...


Preparation of silica@silica core-shell microspheres using an aqueous two-phase system in a novel microchannel device.

In the present work, a novel microchannel device was developed and used for the preparation of core-shell microspheres combining with a Dextran/Poly (ethylene glycol) diacrylate (DEX/PEGDA) aqueous two-phase system (ATPS). Silica@silica core-shell microspheres were prepared as a model material. Silica@silica core-shell microspheres with different sizes of cores and thicknesses of shells were prepared by using different flowrate ratios of DEX/silica and PEGDA/silica aqueous solutions. The content of colloida...

Particle size enlargement and 6-fold fluorescence enhancement of colloidal CdS quantum dots induced by selenious acid.

Herein, colloidal CdS QDs have been synthesized by using cysteine as a stabilizing agent. The interaction between the CdS QDs and selenious acid was monitored by using UV-visible, fluorescence and Fourier transform infrared (FTIR) spectroscopy. The onset of absorption of the CdS QDs (430 nm) was progressively red-shifted upon increase in the concentration of selenious acid at pH 10. It indicated enlargement of the particle size which was confirmed by the dynamic light scattering (DLS) measurements. Inte...

Accurate detection of small particles in digital holography using fully convolutional networks.

Particle detection is a key procedure in particle field characterization with digital holography. Due to various background noises, spurious small particles might be generated and real small particles might be lost during particle detection. Therefore, accurate small particle detection remains a challenge in the research of energy and combustion. A deep learning method based on modified fully convolutional networks is proposed to detect small opaque particles (e.g., coal particles) on extended focus images....

Hydrolytic surface erosion of mesoporous silica nanoparticles for efficient intracellular delivery of cytochrome c.

Delivery of apoptosis-associated proteins is an attractive approach to treat cancer, but their large molecular sizes and membrane-impermeability require the use of a suitable delivery carrier. As a versatile drug carrier, mesoporous silica nanoparticles (MSNs) have been utilized to transport a variety of therapeutic molecules. However, the use of MSNs for protein delivery has been limited because their conventionally obtainable pore size (ca. 2-3 nm in diameter) is too small to load large-sized biomolecul...

Aggregation of TiO and Ag nanoparticles in soil solution - Effects of primary nanoparticle size and dissolved organic matter characteristics.

The colloidal stability of nanoparticles NP in soil solution is important to assess their potential effects on ecosystems. The aim of this work was to elucidate the interactions between initial particle size d, particle number concentration (N) as well as the characteristics of dissolved organic matter (DOM) for stabilizing Ag NP and TiO NP. In batch experiments using time-resolved dynamic light scattering (DLS), we investigated the aggregation of TiO NP (79 nm, 164 nm) and citrate-stabilised Ag NP (73...

Effective size separation of laser-generated, surfactant-free nanoparticles by continuous centrifugation.

High-power, nanosecond, pulsed-laser ablation in liquids enables the continuous synthesis of highly-pure colloidal nanoparticles (NPs) at an application-relevant scale. The gained mass weighted particle size distribution is however often reported to be broad, requiring post treatment like centrifugation to remove undesired particle size fractions. To date, available centrifugation techniques are generally discontinuous, limiting the throughput and hindering economic upscaling. Hence, throughout this paper, ...

ISOBAM-stabilized Ni2+ colloidal catalysts: high catalytic activities for hydrogen generation from hydrolysis of KBH4.

ISOBAM-104-stabilized Ni2+ colloidal catalysts were synthesized through a facile method and used for the hydrogen generation from hydrolysis of potassium borohydride (KBH4). Ni nanoparticles (NPs) were formed as active phase during the catalytic process. Ultraviolet-visible spectrophotometry (UV-Vis) and Transmission electron microscopy (TEM) were employed to characterize structure, particle size of the as-formed Ni NPs. The results suggested that the catalytic activity of Ni2+ colloidal catalyst increased ...

Ground state and peculiarity of particle interactions in liquid crystal colloids.

This research proposes a general approach to determine the peculiarity of the interaction between colloidal particles in different liquid crystals. The main idea of this approach is in the definition of the colloidal particle as a source of the possible deformation of the ground state of the director field distribution. The ground state imposes restrictions on possible deformations and determines the peculiarity of the interaction between colloidal particles. Based on this approach, the Coulomb-like interac...

A Rapid and Tunable Method to Fabricate Angle-Independent and Transferable Structurally Colored Films.

The assembly of monodisperse particles into colloidal arrays that diffract visible light through constructive interference is of considerable interest due to their resilience against color fading. In particular, non-iridescent structurally colored materials are promising as a means of coloration for paints, inks, cosmetics, and displays because their color is angle-independent. A rapid and tunable assembly method for producing non-iridescent structurally colored colloidal-based materials that are pliable af...

Self-assembled lignin-silica hybrid material derived from rice husks as the sustainable reinforcing fillers for natural rubber.

Biomass derived fillers have been developed as sustainable substitution of carbon black (CB) used in rubber industry to reduce the dependence on fossil fuels. Lignin is the abundant component of biomass, but has poor reinforcing performance due to its huge particle size. In this work, we prepared a lignin/silica (LS) hybrid material from rice husks via a facile self-assembly method. The formation of LS cut lignin macromolecules into fragments and resulted in a small average particle size of 320 nm. When L...

Small food texture modifications can be used to change oral processing behaviour and to control ad libitum food intake.

Little is known whether small modifications of food texture are sufficient to influence satiation. This study used four iso-caloric yogurts differing in viscosity (low/high) and granola particle size (small/large) to investigate the influence of small texture modifications on oral processing behaviour, eating rate and ad libitum intake. Yogurt viscosity differed by a factor of 1.57x to 1.81x. Granola particle size was 6 mm and 12 mm (2-fold difference). Granola particle concentration based on weight was...

On the Convective Self-Assembly of Colloidal Particles in Nanofluid Based on In-Situ Measurements of Interaction Forces.

While the currently available techniques for the self-assembly of colloidal particles show great promise owing to their simplicity and high efficiency, they are plagued by the fact that they result in colloidal crystals with defects. Here, in order to overcome this problem, we propose a strategy that uses a suspension of nanoparticles (i.e., a nanofluid) as the "solvent" for the colloidal particles. We fabricated colloidal films of microspheres using such a nanofluid suspension and performed in-situ measure...

The Why, Where, Who, How, and What of the vesicular delivery systems.

Though vesicular delivery systems have been widely explored and reviewed, no comprehensive review exists that covers their development from the inception of the concept to its culmination in the form of regulated marketed formulations. With the advancement of scientific research in the field of nanomedicine, certain category of vesicular delivery systems have successfully reached the global market. Despite extensive research and highly encouraging results in a plethora of pathological conditions in the prec...

AC conductivity measurements of ultradilute colloidal suspensions in HEPES buffer.

Impedance spectroscopy was used to probe the AC conductivity of extremely dilute colloidal suspensions (2.5 x 10 ≤ Φw/v ≤ 4.0 x 10) comprising of polystyrene microspheres (PS; κa > 1 and ζ = -65 mV), gold nanoparticles (Au NPs; κa > 1 and ζ = -26 mV) and Au-coated PS metallodielectric particles (Au-PS) in HEPES buffer. When AC electric fields of strength 10 mV and 1 MHz were applied via 100 μm gap interdigitated microelectrodes across 10 μL samples, a highly resistive (θ < 1) and non-monotonic r...

Stabilization of per- and polyfluoroalkyl substances (PFASs) with colloidal activated carbon (PlumeStop®) as a function of soil clay and organic matter content.

The global problem of contamination of drinking water sources and the aquatic environment with per- and polyfluoroalkyl substances (PFASs) originating from highly contaminated soils is addressed in this study. For the first time, a colloidal activated carbon (AC) product (PlumeStop®) was systematically assessed for PFASs stabilization in soil. Colloidal (particle size 0.1-1.1 μm) AC has the advantage that field application is non-intrusive, comprising injection under high pressure in situ at PFAS-contam...

Characterization of Colloidal Amorphous Arrays Prepared by Uniaxial Pressure Application.

We prepared a colloidal amorphous array by applying uniaxial pressure to a powder of monodispersed colloidal silica particles. Pellet-shaped samples were obtained that exhibit different structural colors depending on the diameter of the particles. We characterized the optical properties of the arrays by measuring the angle-dependent scattering spectrum, wherein several spectral peaks were observed. The peak at the longest wavelength was caused by the short-range order of the particle arrangement. Interestin...

Estimation of Particle Size Distribution from Bulk Scattering Spectra: Validation on Monomodal Suspensions.

A particle size distribution (PSD) estimation method based on light-scattering properties was validated on experimental visible/near-infrared scattering spectra of polystyrene suspensions, with a nominal particle size ranging from 0.1 to 12 μm in diameter. On the basis of μ and spectra extracted from double integrating sphere measurements, good PSD estimates were obtained for particles ≥1 μm. The particle volume fraction estimates in the case of μ were close to the target concentrations, although inf...

Periodic particle arrangements using standing acoustic waves.

We determine crystal-like materials that can be fabricated by using a standing acoustic wave to arrange small particles in a non-viscous liquid resin, which is cured afterwards to keep the particles in the desired locations. For identical spherical particles with the same physical properties and small compared to the wavelength, the locations where the particles are trapped correspond to the minima of an acoustic radiation potential which describes the net forces that a particle is subject to. We show that ...

Long term impact of surfactants & polymers on the colloidal stability, aggregation and dissolution of silver nanoparticles.

Cetyl trimethyl ammonium bromide (CTAB), Tween 20, polyvinyl pyrrolidone (PVP) and polyethylene glycol (PEG) are among the commonly used surfactants and polymers to stabilize silver nanoparticles (AgNPs). However, their interactions with AgNPs are different. The impact of these surfactants and polymers on the colloidal stability of freshly synthesized uncoated AgNPs was evaluated through a series of long-term experiments and analyzed in terms of their physical and chemical behavior. The cationic surfactant,...

Colloidal size and redox state of uranium species in the porewater of a pristine mountain wetland.

Uranium (U) speciation was investigated in anoxically-preserved porewater samples of a natural mountain wetland in Gola di Lago, Ticino, Switzerland. U porewater concentrations ranged from less than one µg/L to tens of µg/L, challenging the available analytical approaches for U speciation in natural samples. Asymmetrical flow-field flow fractionation coupled with inductively coupled plasma mass spectrometry, allowed the characterization of colloid populations and the determination of the size distribution...

A Droplet-Based Microfluidics Route to Temperature-Responsive Colloidal Molecules.

Small clusters of spherical colloids that mimic real molecules, so-called colloidal molecules, hold great promise as building blocks in bottom-up routes to new materials. However, their typical hard sphere nature has hampered their assembly into ordered structures, largely due to a lack of control of the inter-particle interactions. In the present work, control of the interactions is enabled by preparing colloidal molecules from temperature-responsive micro-gel particles whose interactions can be tuned all ...

Fundamental evaluation and optimization of porous spherical silica for developing functional fine particles via fluidized bed coating.

Particle coating, a taste-masking technique for drugs, is limited by its long manufacturing time, which is caused by the decrease in the spray rate required to prevent particle agglomeration. Mesoporous silica particles, which have a high surface area and pore sizes in the range of 2-50 nm, possess high surface free energy; they have attracted significant interest for numerous applications in adsorption, separation, and catalysis and drug delivery. A form of mesoporous silica, microbead silicate, can preven...


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