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Dive into the research topics where Vijay Immanuel Raman is active.

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Featured researches published by Vijay Immanuel Raman.


Langmuir | 2008

Characterization of highly porous polymeric materials with pore diameters larger than 100 nm by mercury porosimetry and X-ray scattering methods.

Chrystelle Egger; C. du Fresne; Vijay Immanuel Raman; Volker Schädler; T. Frechen; S. V. Roth; P. Müller-Buschbaum

Highly porous polymeric materials with pore sizes ranging from 100 nm to 1 microm are a very challenging class of materials not only to prepare synthetically (due to the high capillary pressures generated upon solvent removal) but also to characterize structurally. Through the examples of three different types of porous compounds synthesized in our laboratory (i) high-density melamine-based MF-hd with monomodal pore diameters around 500-900 nm, (ii) low-density melamine-based MF-ld with bimodal pore size distribution and average diameters around 2.3 microm and 350 nm, (iii) highly porous polyurethane PU with monomodal pore sizes around 150 nm, we confirm the limitations of mercury porosimetry as a means to investigate the architecture of materials with very high porosity (>80 vol %) and low compressive strength. Instead, a combination of high-resolution scanning electron microscopy and small-angle and ultrasmall-angle X-ray scattering (SAXS and USAXS, respectively) studies of these three types of materials helps in determining both the network and the pore structures. This work elucidates the need and applicability of the SAXS/USAXS techniques in characterizing such porous materials. For instance, the polyurethane specimens can only be quantitatively characterized by scattering techniques, the results of which are corroborated by high-resolution scanning electron microscopy observations.


Archive | 2008

Xerogels made from aromatic polyureas

Volker Schädler; Marc Fricke; Werner Wiegmann; Andreas Emge; Vijay Immanuel Raman; Antonio Sanchez-Ferrer


Materials Science and Engineering: C | 2007

Templated cross-linking reactions for designing nanoporous materials

Daniel Schmidt; Vijay Immanuel Raman; Chrystelle Egger; Cedric du Fresne; Volker Schädler


Archive | 2017

XEROGELS BASED ON POLYUREA

Volker Schädler; Antonio Sanchez-Ferrer; Vijay Immanuel Raman; Marc Fricke; Bernd Bruchmann


Archive | 2008

Method for production of organic xerogels

Volker Schädler; Vijay Immanuel Raman; Marc Fricke


Archive | 2006

Nanoporous polymer foams consisting of reactive polycondensation resins

Volker Schädler; Vijay Immanuel Raman; Fresne Von Hohenesche Cedric Du


Archive | 2006

Nanoporous polymer foams of polycondensation reactive resins

Volker Schädler; Vijay Immanuel Raman; Cedric Du Fresne von Hohenesche


Archive | 2008

Verfahren zur herstellung von organischen xerogelen

Volker Schädler; Vijay Immanuel Raman; Marc Fricke


Archive | 2008

Xerogele auf basis von aromatischem polyharnstoff Xerogels based on aromatic polyurea

Volker Schaedler; Marc Fricke; Werner Wiegmann; Andreas Emge; Vijay Immanuel Raman; Antonio Sanchez-Ferrer


Archive | 2008

Xerogels based on aromatic polyurea.

Andreas Emge; Marc Fricke; Vijay Immanuel Raman; Antonio Sanchez-Ferrer; Volker Schädler; Werner Wiegmann

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Daniel Schmidt

University of Massachusetts Lowell

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