Profiles

Sahar Sultan

Sahar Sultan

PhD Student

Visa sidan på svenska
Works at Department of Materials and Environmental Chemistry
Email sahar.sultan@mmk.su.se
Visiting address Svante Arrhenius väg 16 C
Room C 429
Postal address Institutionen för material- och miljökemi 106 91 Stockholm

About me

Bachelors done in Materials Engineering followed by Masters in Materials Chemistry. Now doing PhD in "3D printed nanocellulose based bioscaffolds" from Stockholm University.

Industrial job experience of 5 years as a Researcher and Safety Officer gained by working in a Solar Cell company, EXEGER SWDEN AB. . Experienced in building various types and sizes of DSCs and measuring them under different light intensities. Operating and maintaining the lab equipments. Screen printing and preparation of electrolytes, dyes and inks.
Apart from this, various internships are done as Product Developer, Quality Controller, Procurement assistant and Heat Treatment Controller.
Experienced in 3D printing, SEM, XRD, BET, FTIR, TGA, Single crystals, Metallography, Crystallography and Optical microscopes.

Publications

A selection from Stockholm University publication database
  • 2019. Sahar Sultan, Aji Mathew.
  • 2019. Sahar Sultan, Aji Mathew.
  • 2019. Sahar Sultan, Aji Mathew.

    This work demonstrates the use of three-dimensional (3D) printing to produce porous cubic scaffolds using cellulose nanocomposite hydrogel ink, with controlled pore structure and mechanical properties. Cellulose nanocrystals (CNCs, 69.62 wt%) based hydrogel ink with matrix (sodium alginate and gelatin) was developed and 3D printed into scaffolds with uniform and gradient pore structure (110-1,100 µm). The scaffolds showed compression modulus in the range of 0.20-0.45 MPa when tested in simulated in vivo conditions (in distilled water at 37 °C). The pore sizes and the compression modulus of the 3D scaffolds matched with the requirements needed for cartilage regeneration applications. This work demonstrates that the consistency of the ink can be controlled by the concentration of the precursors and porosity can be controlled by the 3D printing process and both of these factors in return defines the mechanical properties of the 3D printed porous hydrogel scaffold. This process method can therefore be used to fabricate structurally and compositionally customized scaffolds according to the specific needs of patients.

  • Article CelloMOF
    2019. Sahar Sultan (et al.). Advanced Functional Materials 29 (2)

    3D printing is recognized as a powerful tool to develop complex geometries for a variety of materials including nanocellulose. Herein, a one-pot synthesis of 3D printable hydrogel ink containing zeolitic imidazolate frameworks (ZIF-8) anchored on anionic 2,2,6,6-tetramethylpiperidine-1-oxylradical-mediated oxidized cellulose nanofibers (TOCNF) is presented. The synthesis approach of ZIF-8@TOCNF (CelloZIF8) hybrid inks is simple, fast (approximate to 30 min), environmentally friendly, takes place at room temperature, and allows easy encapsulation of guest molecules such as curcumin. Shear thinning properties of the hybrid hydrogel inks facilitate the 3D printing of porous scaffolds with excellent shape fidelity. The scaffolds show pH controlled curcumin release. The synthesis route offers a general approach for metal-organic frameworks (MOF) processing and is successfully applied to other types of MOFs such as MIL-100 (Fe) and other guest molecules as methylene blue. This study may open new venues for MOFs processing and its large-scale applications.

  • 2019. Sahar Sultan, Aji Mathew.
  • 2018. Sahar Sultan, Aji Mathew.
  • 2018. Sahar Sultan, Aji Mathew.
  • 2018. Sahar Sultan, Aji P. Mathew. Nanoscale 10 (9), 4421-4431

    3-Dimensional (3D) printing provides a unique methodology for the customization of biomedical scaffolds with respect to size, shape, pore structure and pore orientation useful for tissue repair and regeneration. 3D printing was used to fabricate fully bio-based porous scaffolds of a double crosslinked interpenetrating polymer network (IPN) from a hydrogel ink of sodium alginate and gelatin (SA/G) reinforced with cellulose nanocrystals (CNCs). CNCs provided favorable rheological properties required for 3D printing. The 3D printed scaffolds were crosslinked sequentially via covalent and ionic reactions resulting in dimensionally stable hydrogel scaffolds with pore sizes of 80-2125 m and nanoscaled pore wall roughness (visible from scanning electron microscopy) favorable for cell interaction. The 2D wide angle X-ray scattering studies showed that the nanocrystals orient preferably in the printing direction; the degree of orientation varied between 61-76%. The 3D printing pathways were optimised successfully to achieve 3-dimensional scaffolds (Z axis up to 20 mm) with uniform as well as gradient pore structures. This study demonstrates the potential of 3D printing in developing bio-based scaffolds with controlled pore sizes, gradient pore structures and alignment of nanocrystals for optimal tissue regeneration.

  • 2017. Sahar Sultan, Aji Mathew.

    Nanoscaled versions of cellulose viz. cellulose nanofibers (CNF)or cellulose nanocrystals (CNC) isolated from natural resourcesare being used extensively since the past decade in thebiomedical field e.g. for tissue engineering, implants, drug deliverysystems, cardiovascular devices, andwound healing due totheir remarkable mechanical, chemical and biocompatible properties.In the recent years, 3D printing of nanocellulose in combinationwith polymers is being studied as a viable route to futureregenerative therapy. The printability of nanocellulose hydrogelsowing to their shear thinning behavior and the possibility to supportliving cells allows 3D bioprinting using nanocellulose, arecent development which holds tremendous potential.

Show all publications by Sahar Sultan at Stockholm University

Last updated: April 30, 2019

Bookmark and share Tell a friend