Effect and mechanism of colloidal silica sol on properties
Influence of colloidal silica sol SS consisting of mono dispersed nano silica on properties and microstructure of the hardened cement based materials was investigated as compared to the nano silica NS powder with agglomerates in micron scale through detecting the mechanical and durable properties of the hardened mortar and by using SEM observation nano indentation test and MIP analysis
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Colloidal Interactions between Particles with Tethered
Colloidal interactions between particles dispersed in a liquid can be suitably tailored by modifying the surface chemistry of the particles In the case of fumed silica particles the surface can be systematically altered from hydrophilic to hydrophobic by replacing a portion of the original silanol Si OH groups by nonpolar alkyl chains
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Synergistic effect of colloidal nano and micro silica on
The optimum interaction of colloidal nano silica CNS and micro silica MS which is a function of W/C and cement fineness has an exclusive effect on the particular properties of cement composites such as strengths porosity and microstructure
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Microstructure and Elastic Properties of Colloidal Gel
Colloidal gel foams are composed of a continuous attractive particle network that surrounds and interconnects dispersed bubbles Here we investigate their stability morphology and elasticity as a function of foaming intensity surfactant concentration and hydrophobicity pH and colloid volume fraction Upon optimizing these parameters highly stable colloidal gel foams are created
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Microstructure and Mechanical Properties of a TRIP Aided
Microstructure and Mechanical Properties of a TRIP Aided Martensitic Steel alumina powder and colloidal silica and then ion thinning was performed The retained austenite characteristics of the steels were evaluated by x ray diffractometry The volume fractions of
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Influence of nano silica agglomeration on microstructure
By using colloidal silica sol it is often assumed that the mono dispersed nano particles can act as fillers and seeds much more effectively than those agglomerates in powder or dispersion Nevertheless our investigations revealed that the silica sol will gel or coagulate immediately when the cement is mixed into the water containing sol 21 due to rapid increase of ionic strength in paste 22
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Microstructure and Properties of Polyimide /Monodispersed
Microstructure and Properties of Polyimide /Monodispersed Colloidal Silica Hybrid Films Prepared by Sol–Gel Process p 650 Preparation and Patterning of Optical Hybrid Thin Films Based on Photosensitive Polyimide and Monodispersed Colloidal Silica
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Effect and mechanism of colloidal silica sol on properties
Influence of colloidal silica sol SS consisting of mono dispersed nano silica on properties and microstructure of the hardened cement based materials was investigated as compared to the nano silica NS powder with agglomerates in micron scale through detecting the mechanical and durable properties of the hardened mortar and by using SEM observation nano indentation test and MIP
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Synthesis and Characterization of Monodisperse Colloidal
particle properties depended on the initial composition of the ization of the chemical microstructure and particle mor phology of these new organo silica spheres described in this paper is a continuation of our analytical work described else standing of the formation of condensed colloidal silica
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Effect and mechanism of colloidal silica sol on properties
Influence of colloidal silica sol SS consisting of mono dispersed nano silica on properties and microstructure of the hardened cement based materials was investigated as compared to the nano silica NS powder with agglomerates in micron scale through detecting the mechanical and durable properties of the hardened mortar and by using SEM observation nano indentation test and MIP analysis
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Microstructure of sheared monosized colloidal suspensions
Hydrodynamic and near particle interactions in sheared suspensions are communicated through suspension microstructure to produce a wide variety of rheological behaviors To characterize this microstructure the individual positions of monosized silica particles flowing through a microchannel are obtained with near simulation level detail
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Microstructure and Properties of Polyimide /Monodispersed
In this study the polyimide silica hybrid thin films 6FDA 6FpDA 4ABA/SiO2 FS0 FS50 were prepared from the 12nm colloidal silica and polyimide bearing acid endgroups During the preparation without any additional coupling agents or chelating ligands were used The strong interactions between carboxylic acid coordinating with silica were believed to prevent the macrophase separation
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Rheology of Fumed Silica Dispersions in Organic Liquids
colloidal interactions that dictate the microstructure of these systems Issues dealing with silica having hydro phobic surface chemistry are elaborated on in a separate publication 6 Fundamental studies on silica dispersions date as far backasthe1920s seerefsinIler1 andhavemostlyfocused onaqueousmedia 7 12 Itisnowwell knownthattheDLVO
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Effect of colloidal nano silica on the mechanical and
This paper presents a laboratory study of the properties of colloidal nano silica CS /waste glass cement composites The microstructure alkali–silica reaction ASR and the mechanical properties of cement mortars containing waste glass powder WG as a cement replacement with and without CS are investigated and compared with plain mortar
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Strength elastic and microstructural properties of SCCs
This paper discusses the results of an experimental study which investigated the strength elastic and microstructural properties of SCC mixtures modified with different particle sizes of colloidal nano SiO 2 CNS CNS samples having 35 17 and 5 nm average particle size were used with the aim of reducing the total fine material fly ash content in SCC designs
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Effect of nano silica on the hydration and microstructure
pastes and the accelerating effects of a 5 nm colloidal silica addi tive on the rate of C 3S phase dissolution C–S–H gel formation and removal of non hydrogen bound OH groups However it can be noticed that the investigation of the effect of nano silica on cement hydration and microstructure development of UHPC is insufficient 13
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Hollow silica sphere colloidal crystals insights into
Colloidal crystals consisting of monodisperse hollow silica spheres represent a well defined porous material class which features a range of interesting optical mechanical and thermal properties These hierarchically structured materials comprise micropores within the silica
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Chemical vs mechanical microstructure evolution in drying
The colloidal microstructure in stable suspensions evolves continuously during drying and manufacturing surfaces with desired aesthetic and barrier properties 1 2 3 4 5 or PEO and silica
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Effect of Colloidal Silica and Nano Boehmite Mixture on
Aluminum titanate Al2TiO5 is an engineering ceramic with low thermal expansion coefficient excellent thermal shock resistance good refractoriness and non wetting with most metals In this work the use of colloidal silica and nano boehmite mixture in proper stoichiometry of mullite in aluminum titanate tialite has been studied
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MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL
castable compositions Colloidal silica sols are stable water based suspensions containing up to 50 wt of nanometric spherical amorphous silica particles 8 15 nm diameter When combined with other solid particles colloidal silica can be linked together in branched chains in a process known as gelation 3 which can be induced by water removal
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Silane Adsorption Behavior Microstructure and Properties
Silane Adsorption Behavior Microstructure and Properties of Glycidoxypropyltrimethoxysilane Modified Colloidal Silica Coatings
Get PriceElectrorheological properties and microstructure of silica
Electrorheological properties and microstructure of silica suspensions Gehin C 1 Persello J Charraut D Cabane B We present experimental and theoretical results on the electrorheological response and microstructure of colloidal suspensions composed of silica nanoparticles dispersed in a silicon oil as a function of electric field
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Dynamic properties of shear thickening colloidal
The transient shear rheology i e frequency and strain dependence is compared to the steady rheology for a model colloidal dispersion through the shear thickening transition Reversible shear thickening is observed and the transition stress compares well to theoretical predictions Steady and transient shear thickening are observed to occur at the same value of the average stress
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Silanization of Silica Nanoparticles and Their Processing
In this work the influence of the filler–matrix versus filler–filler interaction on the mechanical properties of a silica nanoparticle–rubber composite was investigated For this purpose nanostructured microraspberry particles with different surface properties were designed and prepared using colloidal silica and two different kinds of
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Synthesis and Characterization of Colloidal Model
of Colloidal Model Particles Made from Organoalkoxysilanes A van Blaaderen and A Vrij Van t Hoff Laboratory University of Utrecht Padualaan 8 3584 CH Utrecht The Netherlands Monodisperse colloidal silica spheres were prepared by hydrolysis and condensation of tetraethoxysilane TES in a mixture of water ammonia and a lower alcohol
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Viscoelastic properties of colloidal gels Journal of
The microstructure and scaling of mechanical properties of dense colloidal gels were investigated as a function of volume fraction and strength of interparticle attraction Gels were reversibly formed by cooling suspensions of octadecyl silica particles in decalin or tetradecane Shear history independence of mechanical properties was ensured by preshearing the suspensions in the gelled state
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Colloidal HPMO Nanoparticles Silica‐Etching Chemistry
Colloidal HPMO Nanoparticles Silica‐Etching Chemistry Tailoring Topological Transformation and Nano‐Biomedical Applications Yu Chen State Laboratory of High Performance Ceramic and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P R China
Get PriceRelationship between Microstructure Dynamics and
Structure and Yielding of Colloidal Silica Gels Varying the Range of Interparticle Interactions The Journal of Physical Chemistry B 2016 120 25 DOI 10 1021/acs jpcb 6b04047 Huan Zhang Guangcui Yuan Chuanzhuang Zhao and Charles C Han
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Silane adsorption behavior microstructure and properties
Silane adsorption behavior microstructure and properties of glycidoxypropyltrimethoxysilane modified colloidal silica coatings
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Silanization of Silica Nanoparticles and Their Processing
In this work the influence of the filler–matrix versus filler–filler interaction on the mechanical properties of a silica nanoparticle–rubber composite was investigated For this purpose nanostructured microraspberry particles with different surface properties were designed and prepared using colloidal silica and two different kinds of
Get Price
MICROSTRUCTURE AND PROPERTIES OF COLLOIDAL
Colloidal silica sols are stable water based suspensions containing up to 50 wt of nanometric spherical amorphous silica particles 8 15 nm diameter When combined with other solid particles colloidal silica can be linked together in branched chains in a process known as gelation which can be induced by water removal
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Strength Rapid Chloride Penetration and Microstructure
This paper presents the strength rapid chloride penetration and microstructure study of cement mortar incorporating micro silica MS nano silica NS and micro silica with optimized content of nano silica MS NS as a partial replacement of cement The hardened properties of the mortar such as
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Electrorheological properties and microstructure of silica
We present experimental and theoretical results on the electrorheological response and microstructure of colloidal suspensions composed of silica nanoparticles dispersed in a silicon oil as a function of electric field strength and silica water content
Get PriceReduction of Cement Consumption by the Aid of Silica Nano
Abstract In this study effects of replacing cement with colloidal amorphous silica nano particles have been experimentally investigated on the physical and mechanical properties durability and microstructure of concrete
Get PriceThe effect of silica doping on the microstructure and
Abstract c ZrO2/SiO2 composites with various amounts of SiO2 additions were produced by a colloidal processing and pressureless sintering at 1400 °C The influence of the microstructure and SiO2 content on the grain size flexural strength and fracture toughness of the composites were determined The results showed that SiO2 had very limited solubility of 0 3 wt in c ZrO2 matrix
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Reduction of Cement Consumption by the Aid of Silica Nano
Abstract In this study effects of replacing cement with colloidal amorphous silica nano particles have been experimentally investigated on the physical and mechanical properties durability and microstructure of concrete
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