Concept

Silica gel

Related publications (95)

Portable Amperometric Perchlorate Selective Sensors with Microhole Array-water/organic Gel Interfaces

A novel stick-shaped portable sensing device featuring a microhole array interface between the polyvinylchloride- 2-nitrophenyloctylether (PVC-NPOE) gel and water phase was developed for in-situ sensing of perchlorate ions in real water samples. Perchlorat ...

2013

Modelling of Alkali-Silica Reaction under Multi-Axial Load

Alain Benjamin Giorla

Alkali-Silica Reaction (ASR) is a deleterious expansion phenomenon which affects the long-term behaviour of concrete. Its origin is a chemical reaction between amorphous silica present in the aggregates and alkali ions from the concrete pore solution. The ...

EPFL2013

Probing the microscopic strength of alumina reinforcements

Andreas Mortensen, Goran Zagar, Raphaël Charvet, Cyril Dénéréaz, Andreas Rossoll, Martin Guillermo Mueller, Václav Pejchal, Willy Dufour

By combining focused ion beam milling methods with microtesting techniques and finite element simulation we probe the strength of microscopic alumina phases that can be used as reinforcements in the production of metal matrix composite materials. We presen ...

2013

The influence of aluminium on the dissolution of amorphous silica and its relation to alkali silica reaction

Karen Scrivener, Theodor Alexandre Emmanuele Chappex

It is known that the addition of supplementary cementitious materials (SCMs) in concretes reduces or even stops expansion due to alkali silica reaction (ASR). It has been widely shown that the main mechanism controlling ASR in blends is the alkali fixation ...

Pergamon-Elsevier Science Ltd2012

The role of aluminium from supplementary cementitious materials in controlling alkali-silica reaction

Theodor Alexandre Emmanuele Chappex

Alkali silica reaction (ASR) is a long-term reaction between certain aggregates containing amorphous silicate phases and the alkalis from the cement paste. These silicates react with the alkalis present in the pore solution of the cement paste and form an ...

EPFL2012

Phenyl-bridged polysilsesquioxane positive and negative resist for electron beam lithography

Jürgen Brugger, Vaida Auzelyte

We present and characterize an organic–inorganic hybrid sol–gel material, phenyl-bridged polysilsesquioxane (ph-PSQ), for use as a new highresolution resist for electron beam lithography (EBL). The resist has a unique characteristic as the only positive to ...

Institute of Physics2012

From Particles to Pillars

Josias Basil Wacker

Metal oxide nanoparticles and their applications (e.g. in nano-electronics, nano-optics or drug delivery) have seen a growing interest in the past decades. Traditional procedures to synthesize, functionalize and integrate nanoparticles in devices mostly ha ...

EPFL2012

Hydrogel Microfluidics to Control Stem Cell Fate

Steffen Cosson

Biomolecular signaling is of utmost importance in governing many biological processes such as morphogenesis during tissue development where biomolecules regulate key cell-fate decisions. In vivo, these factors are presented in a spatiotemporally tightly co ...

EPFL2012

Changes in the Silanol Protonation State Measured In Situ at the Silica-Aqueous Interface

Majed Chergui, Christopher Alexander Arrell, Mariateresa Scarongella

Recent nanomedical applications have again highlighted the significance of silica surface chemistry in solution. Here, we report in situ electronic structure measurements at the silica-aqueous interface as a function of pH for nanoparticles (NPs) of 7, 12, ...

2012

Stiffening of organosilicate glasses by organic cross-linking

Efthimios Kaxiras, Han Li

Atomistic simulations show that organosilicates, used as low permittivity dielectric materials in advanced integrated circuits, can be made substantially stiffer than amorphous silica, while maintaining a lower mass density The enhanced stiffness is achiev ...

2011

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