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2017年9月3日 The monolithic column is made up of continuous porous material, sealed against the wall of a tube, instead of beads. The decrease in chemicals and samples
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2023年8月15日 The major brand of the monolithic silica columns used in HPLC is Chromolith from Merck (or rebranded Onyx from Phenomenex) of RP-C18 sorbent. Their
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2006年4月1日 Monolithic silica with HPLC separation and solid phase extraction materials for determination of drugs in biological materials. Analytical Methods 2011 , 3 (10) , 2189.
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This review looks at how the size range of monolithic silica columns has been expanded, how high-efficiency monolithic silica columns have been realized, and how various
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2018年4月18日 Through the pyrolysis of (CF 3 COO) 3 La, monolithic transparent silica-LaF 3 nanocomposites have been prepared . This technique has been used to prepare monolithic silica glasses containing
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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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2020年7月29日 3 Citations. Explore all metrics. Abstract. The silica monoliths were prepared by a combination of sol-gel synthesis, pore templating, and a process of phase
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2014年1月1日 Monolithic silica aerogel samples were produced from polyethoxydisiloxane precursors. • Mechanical properties are shown to be highly dependent on aerogel
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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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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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2021年3月1日 Silica monolithic columns provide high permeability and porosity, which result in comparable efficiency to conventional particle packed columns with an extremely low back-pressure. Nowadays, silica monolithic columns are. Conclusion. A detailed overview of the fabrication and application of silica monolithic column has been
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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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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 structures with very low capillary-to-domain size aspect-ratios. These structures include the absolute minimal aspect-ratio case of a monolithic structure whose cross-section only contains a
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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
خبير الاتصال2014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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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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2007年3月23日 In summary, monolithic silica aerogels can easily be prepared by the sol–gel polymerization of methyltrimethoxysilane precursor followed by the drying of the gels at the ambient pressure. The in situ attachment of methyl groups to the siloxane backbone and the low degree of silica polymerization make the silica network easily deformable that ...
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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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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 than particle-packed columns based on the variable external porosity and variable through-pore size/skeleton size ratios. The high permeability of monolithic silica
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2008年5月16日 The size of through-pores of monolithic silica in capillaries can be much larger than the skeleton size, resulting in a through-pore size/skeleton size ratio of up to 1.5–4 [4].These ratios were reported to be 0.25–0.4 with particle-packed columns [24], and found to be 1.2–1.5 for monolithic silica columns prepared in a mold with shrinkage of the
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2022年9月19日 A picoliter thin-layer chromatography (pTLC) platform was developed for analyzing extremely miniature specimens, such as assay of the contents of a single cell of 1 picoliter volume. The pTLC chip
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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
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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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2018年9月25日 This was the first report that the classically monolithic silica aerogel with both nanoscale coherent skeletons and pores was achieved via eco-friendly water solvent system and ambient pressure drying in one-step. In the whole procedure, MTMS was mainly used as a silicon source, water was mainly used as a solvent, and CTAB served as a
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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 permeability of monolithic silica columns ...
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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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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
خبير الاتصال1995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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