Particle packed columns and monolithic columns in high-performance liquid chromatography-comparison and critical appraisal

KK Unger, R Skudas, MM Schulte - Journal of Chromatography A, 2008 - Elsevier
The review highlights the fundamentals and the most prominent achievements in the field of
high-performance liquid chromatography (HPLC) column development over a period of …

Recent developments in the evaluation of chemically bonded silica packings for liquid chromatography

KK Unger, N Becker, P Roumeliotis - Journal of Chromatography A, 1976 - Elsevier
The basic variables and conditions in the synthesis of chemically bonded silica packings (CBSPs),
obtainable by means of a surface reaction between porous silica and an …

Synthesis of spherical porous silicas in the micron and submicron size range: challenges and opportunities for miniaturized high-resolution chromatographic and …

KK Unger, D Kumar, M Grün, G Büchel, S Lüdtke… - … of Chromatography A, 2000 - Elsevier
Classical silica technology has reached its limit with respect to an ultimate minimum particle
size of about 2 μm in diameter. Here, a novel process is presented which allows one to …

Recommendations for the characterization of porous solids (Technical Report)

J Rouquerol, D Avnir, CW Fairbridge… - Pure and applied …, 1994 - degruyter.com
RECOMMENDATIONS FOR THE CHARACTERIZATION OF POROUS SOLIDS Page 1 Pure
& Appl. Chern., Vol. 66, No. 8, pp. 1739-1758, 1994. Printed in Great Britain. Q 1994 IUPAC …

The synthesis of micrometer‐and submicrometer‐size spheres of ordered mesoporous oxide MCM‐41

M Grün, I Lauer, KK Unger - Advanced Materials, 1997 - Wiley Online Library
Spherical particles of the mesoporous material MCM‐41 have been synthesized and are
reported for the first time. The results of characterization of the samples by X‐ray diffraction, …

[BOEK][B] Porous silica

KK Unger - 1979 - books.google.com
2.2. 2 Origin of porosity in silica.--2.3 Controlled porosity silica packings........ 2.3. 1 Modified
sol—gel procedure followed by sintering. 2.3. 2 Polyethoxysiloxane procedure.......... 2.3. 3 …

Capillary hysteresis in nanopores: theoretical and experimental studies of nitrogen adsorption on MCM-41

PI Ravikovitch, SCÓ Domhnaill, AV Neimark, F Schüth… - Langmuir, 1995 - ACS Publications
Capillary hysteresis in cylindrical nanopores has been studied using MCM-41 as the prime
example of a mesoporous material. These materials, due to their regular pore structure, can …

Novel pathways for the preparation of mesoporous MCM-41 materials: control of porosity and morphology

M Grün, KK Unger, A Matsumoto, K Tsutsumi - … and mesoporous materials, 1999 - Elsevier
Two novel synthesis routes for the preparation of mesoporous MCM-41 materials are
introduced. Both methods use tetra-n-alkoxysilanes such as tetraethoxysilane (TEOS) or tetra-n-…

Novel synthesis of spherical MCM-48

K Schumacher, M Grün, KK Unger - Microporous and Mesoporous …, 1999 - Elsevier
A novel synthesis route was developed for the cubic member of the M41S family, MCM-48,
with a three-dimensional pore system allowing the formation of submicrometre- to micrometre-…

Pore size analysis of MCM-41 type adsorbents by means of nitrogen and argon adsorption

AV Neimark, PI Ravikovitch, M Grün, F Schüth… - Journal of colloid and …, 1998 - Elsevier
Methods of nonlocal density functional theory (NLDFT), proposed recently for predictions of
adsorption equilibrium and calculations of pore size distributions in micro- and mesoporous …