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monolithic silica

A review of recent progress on the silica aerogel monoliths:

2021年3月19日  The silica aerogel monoliths (SAMs) with three-dimensional (3D) porous structures showing unique physical and chemical properties promise a new era of

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Advancements in the preparation and application of monolithic

2021年3月1日  Silica monolithic columns were first proposed by Kazuki Nakanishi's group, where the bi-continuous pore structure silica gels were prepared through the sol-gel phase

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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,

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Monolithic Silicas in Separation Science Wiley Online Books

2011年1月12日  Monolithic Silicas in Separation Science: Concepts, Syntheses, Characterization, Modeling and Applications. Editor (s): Prof. Klaus K. Unger, Prof. Nobuo

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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 freezing

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Monolithic Silica - SnG Inc.

The monolithic silica, which is a bicontinuous porous body composed of through pore and small pore, is capable of independently controlling the size of these bimodal pores when the material

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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

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Properties of Monolithic Silica Columns for HPLC

2006年4月14日  Monolithic silica columns and their use in high peak-capacity HPLC separations are reviewed. Monolithic silica columns can potentially provide higher overall performance

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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 freezing temperatures and fast cooling rates favor monolithicity. Uniform networks and a high degree of 3-D cross-linking correlate with monolithicity. Compared to aerogels, cryogels exhibit larger

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

2021年3月1日  C18 silica monolithic columns have smaller retention factors compared to particle packed columns. High retentivity is not expected for a silica monolithic column due to its high porosity and small phase ratio. Consequently, the column efficiency of a monolithic column is generally lower than that of a particle packed column.

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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, ...

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Recent Advances in Silica-Based Monolithic HPLC Columns

2008年4月1日  In this article, silica-based monolithic columns are compared and contrasted to packed microparticulate columns. Some of the challenges developing commercial silica rods and encapsulated monolith columns are described, including the development of a 2-mm i.d. column. A study of wall effects in these monolith columns was performed. Future trends and

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Mechanical properties of monolithic silica aerogels made from ...

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, microstructural, and thermal

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Properties of monolithic silica columns for HPLC - PubMed

Monolithic silica columns and their use in high peak-capacity HPLC separations are reviewed. Monolithic silica columns can potentially provide higher overall performance than particle-packed columns based on the variable external porosity and variable through-pore size/skeleton size ratios. The high

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Rapid synthesis and characterization of monolithic ambient pressure ...

2020年5月22日  In this work, monolithic silica aerogels were prepared in pure water within 4 h by using MTMS as the precursor under ambient pressure drying (APD). The effects of the volume ratio of H2O/MTMS, CTAB content and NH3H2O concentration on the properties of MTMS-based aerogels (MSA) were investigated experimentally. The realization of the rapid synthesis

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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 of cracks and

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Hydrophobic monolithic silica with abundant pore as ... - Springer

2013年6月11日  Hydrophobic (water CA, 155° ± 5°) monolithic silica (HMS) material with abundant pore was prepared via sol–gel method by using tetraethoxysilane as silicon source and trimethylchlorosilane as surface modification agent. High specific area and appropriate pores structure of the HMS material supply enough space for storing the absorbed molecules. The

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Monolithic Cylindrical Fused Silica Resonators with High Q

2016年7月28日  The cylindrical resonator gyroscope (CRG) is a typical Coriolis vibratory gyroscope whose performance is determined by the Q factor and frequency mismatch of the cylindrical resonator. Enhancing the Q factor is crucial for improving the rate sensitivity and noise performance of the CRG. In this paper, for the first time, a monolithic cylindrical fused silica

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Nanoparticle Formulation Composition Analysis by Liquid

2022年12月22日  Our study identifies the viability of reversed-phase monolithic silica in the chromatography of both small drug molecules and particularly pharmapolymers in a repeatable and simultaneous fashion, and can provide a valuable strategy for analysis of diverse precursor polymer systems and drug components in multifunctional drug formulations.

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Chromolith® HPLC Columns Analytics and Sample Preparation

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 Column for LC - SnG Inc.

Monolithic Silica Column for LCThe monolithic silica column is a column for liquid chromatography that filled large monolithic silica directly into high pressure resistant stainless steel tube.The low column pressure produced by the c.

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Methyltrimethoxysilane based monolithic silica aerogels via ambient ...

2007年3月23日  We have developed a novel route to monolithic silica aerogels via ambient pressure drying by the acid–base sol–gel polymerization of methyltrimethoxysilane (MTMS) precursor. An extent of silica polymerization in the alcogels plays a crucial role in obtaining the monolithic aerogels which could be optimized by a proper control over the MeOH/MTMS molar

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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. The molar

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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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Monolithic silicon for high spatiotemporal translational ...

2024年2月21日  A silicon-based electrode system is described that allows tunable spatiotemporal photostimulation of cardiac systems, with the optoelectronic capabilities of these devices being demonstrated in ...

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Inverse Analysis of Monolithic Silica Aerogel’s Thermophysical ...

2023年10月31日  Thermal conductivity is the only measurable parameter for a simple and restricted steady-state apparatus. To deeply explore monolithic silica aerogel’s thermophysical properties, not limited to thermal conductivity, we developed a novel differentiable learning (DL) method to evaluate unsteady-state thermal insulation performance by inverse analyzing the

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Monolithic Silica with Bimodal Pore Structure - MilliporeSigma

Chromolith ® HPLC and UHPLC columns are made from monolithic silica with a bimodal pore structure using sol-gel technology. Mesopores and macropores are formed within the monolithic silica. The column is no longer packed with small particles but consists of a single monolithic piece of high-purity polymeric silica gel.

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