Abdulla Bin Afif

• Afif, Abdulla Bin; Ivashenko, Oleksii; Kolstad, Alexandra Jahr & Sjåstad, Anja Olafsen (2026). Strain-Driven Honeycomb Reconstruction of Multilayered Rh/Pt(111). ACS Applied Materials & Interfaces. ISSN 1944-8244. 18(21), s. 30446–30455. doi: 10.1021/acsami.5c25647. Fulltekst i vitenarkiv
• Burgmann, Stephanie; Afif, Abdulla Shaikh Abdul Qader Bin; Lid, Markus Joakim; Baglo, Kjetil; Chaikasetsin, Settasit & Helvoort, Antonius Van [Vis alle 9 forfattere av denne artikkelen] (2023). In Situ ALD-TEM System to Study Atomic Nucleation Phenomena- Enabled by Ultrathin Large Aspect Ratio Free-Standing Shell Structures. Key Engineering Materials. ISSN 1013-9826. 968, s. 31–38. doi: 10.4028/p-0dLR8p. Fulltekst i vitenarkiv
• Ødegaard, Kristin Sirnes; Westhrin, Marita; Afif, Abdulla Shaikh Abdul Qader Bin; Ma, Qianli; Mela, Petra & Standal, Therese [Vis alle 8 forfattere av denne artikkelen] (2023). The effects of surface treatments on electron beam melted Ti-6Al-4V disks on osteogenesis of human mesenchymal stromal cells. Biomaterials Advances. ISSN 2772-9516. 147. doi: 10.1016/j.bioadv.2023.213327. Fulltekst i vitenarkiv
• Baglo, Kjetil; Sauermoser, Marco; Lid, Markus Joakim; Paschke, Thomas; Afif, Abdulla Shaikh Abdul Qader Bin & Lunzer, Markus [Vis alle 10 forfattere av denne artikkelen] (2023). Overcoming the Transport Limitations of Photopolymer-Derived Architected Carbon. Advanced Materials Technologies. 8(15). doi: 10.1002/admt.202300092. Fulltekst i vitenarkiv
• Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Flaten, Andreas; Lid, Markus Joakim; Ofstad, Johannes & Erbe, Andreas [Vis alle 8 forfattere av denne artikkelen] (2022). A toolbox for easy entry low wavenumber in situ atomic layer deposition transmission FTIR spectroscopy studies. Review of Scientific Instruments. ISSN 0034-6748. 93(8). doi: 10.1063/5.0102518. Fulltekst i vitenarkiv
• Afif, Mohammed Bin; Afif, Abdulla Shaikh Abdul Qader Bin; Apostorleris, Harry; Gandhi, K; Dadlani, Anup & Ghaferi, AA [Vis alle 8 forfattere av denne artikkelen] (2022). Ultra-Cheap Renewable Energy as an Enabling Technology for Deep Industrial Decarbonization via Capture and Utilization of Process CO<inf>2</inf> Emissions. Energies. 15(14). doi: 10.3390/en15145181. Fulltekst i vitenarkiv Vis sammendrag

  Rapidly declining costs of renewable energy technologies have made solar and wind the cheapest sources of energy in many parts of the world. This has been seen primarily as enabling the rapid decarbonization of the electricity sector, but low-cost, low-carbon energy can have a great secondary impact by reducing the costs of energy-intensive decarbonization efforts in other areas. In this study, we consider, by way of an exemplary carbon capture and utilization cycle based on mature technologies, the energy requirements of the “industrial carbon cycle”, an emerging paradigm in which industrial CO2 emissions are captured and reprocessed into chemicals and fuels, and we assess the impact of declining renewable energy costs on overall economics of these processes. In our exemplary process, CO2 is captured from a cement production facility via an amine scrubbing process and combined with hydrogen produced by a solar-powered polymer electrolyte membrane, using electrolysis to produce methanol. We show that solar heat and electricity generation costs currently realized in the Middle East lead to a large reduction in the cost of this process relative to baseline assumptions found in published literature, and extrapolation of current energy price trends into the near future would bring costs down to the level of current fossil-fuel-based processes.

• Lid, Markus Joakim; Afif, Abdulla Shaikh Abdul Qader Bin; Torgersen, Jan & Prinz, Fritz (2021). Finish-pass strategy to improve sidewall angle and processing time in FIB milled structures. Procedia Structural Integrity. 34, s. 266–273. doi: 10.1016/j.prostr.2021.12.038. Fulltekst i vitenarkiv Vis sammendrag

  Focused Ion Beams (FIB) systems are employed for their ability to manipulate and remove material on the nanoscale for creating complex structures. By splitting the milling job into multiple sub-patterns, consisting of a bulk milling pattern, and one or more finish pass patterns that follow the contours of the milling geometry, we show that one can counteract the effect of re-deposition on the sidewalls. Our tests showed a reduction in sidewall angle from 96◦to 92.5◦using identical beam conditions and nearly the same processing time employing only one finish pass pattern. Further, by assigning different beam currents to three different sub-patterns, we were able to reduce angles to 92◦, while cutting total milling time by 10%. Improving our strategy may render FIB systems a potential as effective nanofabrication tools applicable beyond creating prototypes and lamellae for material characterization.

• Peron, Mirco; Cogo, Susanna; Bjelland, Maria; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup & Greggio, Elisa [Vis alle 8 forfattere av denne artikkelen] (2021). On the evaluation of ALD TiO2, ZrO2 and HfO2 coatings on corrosion and cytotoxicity performances. Journal of Magnesium and Alloys. 9(5), s. 1806–1819. doi: 10.1016/j.jma.2021.03.010. Fulltekst i vitenarkiv Vis sammendrag

  Magnesium alloys have been widely studied as materials for temporary implants, but their use has been limited by their corrosion rate. Recently, coatings have been proven to provide an effective barrier. Though only little explored in the field, Atomic Layer Deposition (ALD) stands out as a coating technology due to the outstanding film conformality and density achievable. Here, we provide first insights into the corrosion behavior and the induced biological response of 100 nm thick ALD TiO2, HfO2 and ZrO2 coatings on AZ31 alloy by means of potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), hydrogen evolution and MTS colorimetric assay with L929 cells. All three coatings improve the corrosion behavior and cytotoxicity of the alloy. Particularly, HfO2 coatings were characterized by the highest corrosion resistance and cell viability, slightly higher than those of ZrO2 coatings. TiO2 was characterized by the lowest corrosion improvements and, though generally considered a biocompatible coating, was found to not meet the demands for cellular applications (it was characterized by grade 3 cytotoxicity after 5 days of culture). These results reveal a strong link between biocompatibility and corrosion resistance and entail the need of taking the latter into consideration in the choice of a biocompatible coating to protect degradable Mg-based alloys.

• Peron, Mirco; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Berto, Filippo & Torgersen, Jan (2020). Improving stress corrosion cracking behavior of AZ31 alloy with conformal thin titania and zirconia coatings for biomedical applications. Journal of The Mechanical Behavior of Biomedical Materials. ISSN 1751-6161. 111. doi: 10.1016/j.jmbbm.2020.104005. Fulltekst i vitenarkiv Vis sammendrag

  Magnesium and its alloys have been widely studied as materials for temporary implant devices. However, corrosion-assisted cracking phenomena such as stress corrosion cracking (SCC) continue to prevent their mainstream use. For the first time, we explore the SCC susceptibility of Atomic Layer Deposition (ALD) coated AZ31 alloys in Simulated Body Fluid (SBF). Conformal 100 nm coatings of titania and zirconia were deposited on standard dogbone specimens and subjected to slow strain rate tests at 3.5 10-6 s-1 and a temperature of 37 °C. Remarkably, the SCC susceptibility index IUTS was reduced by 6% and 40% and the Iε was reduced by more than 70% and 76% with a titania and zirconia coating, respectively. Potentiodynamic polarization, hydrogen evolution and fracture behavior of the samples revealed the drastic corrosion reduction to be the main reason for the susceptibility reduction. We discuss the observed SCC behavior of our samples in light of the coatings’ electrochemical activities, wettabilities, surface integrities and mechanical properties. This straightforward conformal surface treatment can be useful as a workaround for one of the major bottlenecks of biomedical Mg based implants and hence provides a possible pathway for making them more commonplace in the field.

• Peron, Mirco; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Berto, Filippo & Torgersen, Jan (2020). Comparing physiologically relevant corrosion performances of Mg AZ31 alloy protected by ALD and sputter coated TiO2. Surface & Coatings Technology. ISSN 0257-8972. 395. doi: 10.1016/j.surfcoat.2020.125922. Fulltekst i vitenarkiv Vis sammendrag

  The utilization of Mg alloys for biomedical applications is so far underexplored due to the accelerated corrosion hampering patient recovery post implantation. Here, we explore the effectiveness of corrosion reduction of an AZ31 alloy in Simulated Body Fluid when coated with a 40 nm sputtered TiO2 layer and compare it to a similar coating made by Atomic Layer Deposition (ALD). Potentiodynamic polarization and hydrogen evolution experiments were performed on coated samples having different surface roughness and 3D topologies. Interestingly, ALD layers reduce corrosion current density by 94% on Ra = 118.6 ± 5.1 nm and 93% on Ra = 4794.3 ± 49.4 nm, whereas sputtered only by 84% on Ra = 118.6 ± 5.1 nm and 60% on Ra = 4794.3 ± 49.4 nm. Particularly on 3D aspects, the ALD coatings are superior, where a scaffold of 85% porosity with 1 mm pore sizes released 68% lower hydrogen compared to the sputtered counterparts. We relate these observations to the higher surface integrity, adhesion strength and lower line-of-sight restrictions of ALD compared to sputter deposition. The results can be interesting for researchers and practitioners aiming to make Mg alloys more commonplace as temporary metallic implant materials.

• Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Burgmann, Stephanie; Köllensperger, Peter & Torgersen, Jan (2019). Atomic layer deposition of perovskites—Part 1: Fundamentals of nucleation and growth. Material Design & Processing Communications (MDPC). doi: 10.1002/mdp2.114. Fulltekst i vitenarkiv
• Gougam, Adel B; Rajab, Bilal & Afif, Abdulla Shaikh Abdul Qader Bin (2019). Investigation of c-Si surface passivation using thermal ALD deposited HfO2 films. Materials Science in Semiconductor Processing. ISSN 1369-8001. 95, s. 42–47. doi: 10.1016/j.mssp.2019.02.012. Fulltekst i vitenarkiv
• Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Burgmann, Stephanie; Köllensperger, Peter & Torgersen, Jan (2019). Atomic layer deposition of perovskites part 2: Designing next generation electronic applications. Material Design & Processing Communications (MDPC). doi: 10.1002/mdp2.115. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• Burgmann, Stephanie; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Helvoort, Antonius Van & Torgersen, Jan (2019). Enabling nucleation phenomena studies of ALD deposited films by In-situ high-resolution TEM. Fulltekst i vitenarkiv
• Burgmann, Stephanie; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Torgersen, Jan & Helvoort, Antonius Van (2019). Understanding Nucleation Phenomena of ALD Deposited Films by High-Resolution In-situ TEM. Fulltekst i vitenarkiv
• Burgmann, Stephanie; Afif, Abdulla Shaikh Abdul Qader Bin; Dadlani, Anup; Provine, J; Helvoort, Antonius Van & Torgersen, Jan (2019). Enabling a novel in-situ reactor for high-resolution studies by HF vapor etching. Fulltekst i vitenarkiv

Se alle arbeider i NVA