Journal Article

FZJ-2015-01657

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png E. coli imprinted nano-structured silica micro-granules by spray drying: Optimization of calcination temperature

Sen, D. (Corresponding Author) ; Bahadur, J. ; Das, A. ; Mazumder, S. ; Melo, J. S. ; Frielinghaus, H.FZJ* ; Loidl, R.

2015
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.colsurfb.2015.01.031

Abstract: We have synthesized nano-structured silica–Escherichia coli composite micro-granules by spray drying of mixed suspension of silica and E. coli through evaporation-induced assembly. Synthesized micro-granules were subjected to calcination in order to form shape-matched macro-pores by removing the bacterial cells. The optimization of calcination temperature is crucial because calcination process leads to two contrasting effects, namely, (i) removal of E. coli from the granules and (ii) alteration of mesoscopic structure in the silica network. We have used small-angle neutron scattering and thermo-gravimetric analysis to determine the optimum temperature for calcination of these granules. It was found that calcination in the temperature range of 200 °C to 400 °C removes the cells without significant alteration of the nano-structured silica network. However, beyond 500 °C, calcination results significant coalescence between the silica particles. Calcination at 600 °C eventually collapses the meso-pore network of silica interstices.

Keyword(s): Health and Life (1st) ; Health and Life (1st) ; Nano Science and Technology (1st) ; Biology (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. Neutronenstreuung (ICS-1)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. KWS-1: Small angle scattering diffractometer (NL3b)
2. KWS-3: Very small angle scattering diffractometer with focusing mirror (NL3auS)

Appears in the scientific report 2015

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Database coverage:
; Current Contents - Life Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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