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monolithic silica

A new route to aerogels: Monolithic silica cryogels

2012年2月1日  We have explored several routes to synthesize monolithic silica cryogels. We highlight two routes to monoliths with similarities to the corresponding aerogels. Low

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Versatile Double-Templating Synthesis Route to Silica

2003年5月13日  Monolithic silica exhibiting a trimodal, hierarchical pore structure has successfully been prepared via sol−gel-processing. Monolithic bodies with

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Advancements in the preparation and application of monolithic silica ...

2021年3月1日  Silica monolithic column has been introduced and fabricated through sol-gel method. • Several types of monolith surface functionalization and endcapping are

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Advances in monolithic silica columns for high-performance

2017年9月3日  This review attempts to give an overview of three different types of monolithic columns, i.e. silica-based, polymer-based, and hybrid monolithic column.

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Longevity and other practical benefits of monolithic silica

2023年8月15日  The silica-based monolithic sorbent prepared in situ is morphologically very different from the particle-packed columns when characterized by a continuous rod with a

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Inverse Analysis of Monolithic Silica Aerogel’s

2023年10月31日  To deeply explore monolithic silica aerogel’s thermophysical properties, not limited to thermal conductivity, we developed a novel differentiable learning (DL)

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Chromatographic Properties of Minimal Aspect Ratio Monolithic Silica ...

2021年3月12日  We report on a study wherein we synthesized TMOS-based silica monolithic skeletons in capillaries with an i.d. of 5 and 10 μm to produce skeleton

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View Article Online Chemical Science - RSC Publishing

3 天之前  We used silica monoliths as templates because they can be easily removed by hydrolysis without dissolving organic crystals. Silica monolith is a monolithic gel with a

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Mechanical properties of monolithic silica aerogels made

The sol–gel synthesis method toward nanostructured silica, which typically starts from tetraethyl orthosilicate (TEOS), was used to give cellulose–silica aerogels with low

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Chromolith® HPLC Columns Analytics and Sample

In contrast to conventional particle-packed columns, Merck’s Chromolith® HPLC columns are based on state-of-the-art monolithic silica technology. Produced from a continuous piece of porous silica using a sol-gel process, Chromolith® rod columns possess a defined bimodal pore structure with macro- and mesopores in the micro- and nanometer range.

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Monolithic silica with bimodal pore size distribution fabricated

2006年10月18日  PFA/silica composites can be synthesized by a sol–gel process, according to established processes because the FA monomer is miscible with both water and TEOS. Thus the liquid educt mixture is completely homogeneous. Afterwards the resulting PFA/silica composite materials exhibit polymer structures with a morphology in

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Monolithic silica columns for high-efficiency chromatographic ...

2002年8月2日  Monolithic silica columns prepared from tetraalkoxysilane by a sol–gel method showed high efficiency and high permeability on the basis of the small-sized silica skeletons, large-sized through-pores, and resulting through-pore size/skeleton size ratios much larger than those found in a particle-packed column.

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Mechanical properties of monolithic silica aerogels made

2014年1月1日  We report the preparation and characterization of a broad range of hydrophobic monolithic silica aerogels and xerogels made from polyethoxydisiloxane (PEDS-P 750E20) precursors.Transparent silica aerogels with densities spanning ≈ 0.05 to >0.32 g/cm 3 were synthesized and the effects of density on the mechanical,

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One-pot synthesis of monolithic silica-cellulose aerogel applying

2021年7月26日  The monolithic silica-cellulose aerogel can be synthesized from low modulus (1.5) silicate sol-gel process. The embedded CO 2 emission of this new aerogel is significantly reduced, reflected by the obviously lower footprint of olivine sodium silicate compared to commercial water glass, namely 2.481 tCO 2 /t and 5.517 tCO 2 /t,

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HPLC Column Monolith Phenomenex Onyx

Finish First with Monolithic HPLC Columns Monolithic silica-based HPLC columns that are designed for high-throughput analysis and the direct injection of dirty or viscous samples. Reduce run times with extremely high flow rates (up to 9 mL/min) “Dilute-and ...

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An economic and environmentally benign approach for the

As examples, monolithic silica aerogels from super-hydrophobic (water contact angle larger than 150°) to hydrophilic (water contact angle lower than 25°) and those with a density as low as 0.026 g cm −3 were obtained. Moreover, the internal structures of the aerogels can also be tuned by adjusting the reaction rate of the sol–gel process.

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Monolithic silica aerogel insulation doped with TiO2 powder

1995年6月2日  Mechanical reinforcement of silica aerogel insulation with ceramic fibers. 2008 2nd IEEE International Nanoelectronics. Silica aerogels doped with ceramic fibers were prepared successfully via sol-gel process with polyethoxydisiloxanes (E-40) as the silicon source. Surface modification was used to realize ambient.

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Development of hydrophobic and optically transparent monolithic silica ...

2016年10月26日  In the present paper, highly transparent, monolithic and hydrophobic silica aerogel monoliths were prepared by using tetraethoxysilane (TEOS) as precursor and methyltriethoxysilane (MTES) as co-precursor with different MTES/TEOS molar ratios (M) by two-step acid–base catalyzed sol–gel process followed by supercritical alcohol drying.

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Monolithic silica fiber laser operating at 585 nm - Optica

2023年1月12日  We report, to the best of our knowledge, the first monolithic silica fiber laser operating in the visible. The laser cavity is based on a dysprosium-doped aluminosilicate fiber bounded by a pair of fiber Bragg gratings operating at 585 nm. The yellow laser signal reaches a record output power of 147 mW. Although the pump

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Chiral organic-silica hybrid monolithic HPLC column with

2023年10月1日  A hybrid silica monolithic column (HMC) was prepared using a single precursor (methytrimethoxysilane) in stainless steel HPLC column (50 mm × 4.6 mm) by sol–gel method. The chiral hybrid monolithic column (CHMC) was prepared by grafting 3-aminopropyl trimethoxysilane onto HMC, and then reacting bovine serum albumin (BSA)

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In situ one-step construction of monolithic silica aerogel

2020年8月15日  This monolithic silica aerogel-based composite PCMs could prolong heat preservation duration due to the synergistic effect between low thermal conductivity and high latent heat of composite PCMs, showing potential promise for direct application to the thermal insulation and thermal protection device. More importantly, this in situ one-step ...

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Preparation of Monolithic Silica Aerogel for Fenestration

The ability of a rapid supercritical extraction (RSCE) process implemented in an industrial hot press to produce silica aerogel monoliths (AMs) with properties suitable for use in fenestration products was investigated. The effects of hot-press processing parameters such as press force and heat-up and cool-down rates on the size (area) and quality (presence

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Nano-particle motion in a monolithic silica column using the

We investigated nano-particle motion in a porous material using the single-particle tracking method. The displacement probability distribution deviated from the Gaussian distribution due to the absorption and/or desorption of the particles.

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Longevity and other practical benefits of monolithic silica

2023年8月15日  1 SILICA MONOLITHIC COLUMNS, IN RETROSPECT. Although the introduction of the monolithic technology predicted a revolution in HPLC columns, even after more than 20 years, the number of currently commercially produced columns applicable for routine analysis is not high [1-3].The silica-based monolithic sorbent prepared in situ is

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Recent Progress in Monolithic Silica Columns for High-Speed

Monolithic silica columns have greater (through-pore size)/(skeleton size) ratios than particulate columns and fixed support structures in a column for chemical modification, resulting in high-efficiency columns and stationary phases. This review looks at how the size range of monolithic silica columns has been expanded, how high-efficiency monolithic

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Low temperature synthesis of a monolithic silica glass by the

The reaction process in the pyrolysis of silica gel has been investigated as the basic study on the low temperature synthesis of monolithic glass from a metal alkoxide. A large volume change which may cause stress-induced fracture of a gel occurred in the following process stages: (a) the decompostion of residual organic compounds into carbon dioxide (300 to

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Cosolvent-free synthesis of macroporous silica gels and monolithic ...

2022年4月30日  The sol–gel synthesis of silica glasses has been studied over several decades to form silica glasses at relatively low temperatures without melting [1,2,3,4,5,6,7].However, the processing of monolithic gels and glasses is often difficult because of fracture during the drying of wet gels, originating from capillary force at

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Monolithic VS regular silica columns - Chromatography Forum

2015年9月9日  Probably, there is already a topic discussing the pros and cons of monolithic columns implementation in comparison to regular silica columns, however I was not able to find such a topic (search tool did not provide any results). My question is about replacing regular silica columns for RP HPLC with more advanced monolithic silica columns, which

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Thermoresponsive Polymer Brush on Monolithic-Silica-Rod

2019年12月12日  The prepared monolithic silica-rod columns were also characterized by chromatographic analysis. PIPAAm-brush-modified monolithic silica-rod columns were able to separate hydrophobic steroids with a short analysis time (10 min), compared to PIPAAm-brush-modified silica-beads-packed columns, because of the horizontally limited diffusion

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