Nanomaterials & Nanotechnology Session

Nanomaterials & Nanotechnology Session

Nanomaterials & Nanotechnology Session

Chair: Hagay Shpaisman (BIU)

 

13:30-13:50

Reshef Tenne (WIS)
Keynote Speaker

Title:
Inorganic nanotubes and fullerene-like nanoparticles at the crossroad between materials science and nanotechnology and their applications

Abstract:
Update on the synthesis of new inorganic nanotubes from 2D compounds, like WSe2 and from the asymmetric “misfit” layer compounds (MLC), RES-TaSe2 and RE-(TaSe2)2 (with RE=La, Sm) will be given.[1]
Major progress has been achieved in elucidating the structure of INT and IF and their mechanical, electrical and optical properties.[2] These analyses revealed their for reinforcing variety of polymers was demonstrated leading to numerous potential commercial products.[3-5]

1. M.B. Sreedhara et al., PNAS 118, 35 e2109945118 (2021);
    https://doi.org/10.1073/pnas.2109945118
2. J. Musfeldt, Y. Iwasa and R. Tenne, Physics Today 8, 42-48, August (2020).
3. H. Shalom, S. Kapishnikov, V. Brumfeld, N. Naveh, R. Tenne and N. Lachman, Scientific Reports,     
10:8892 | https://doi.org/10.1038/s41598-020-65861-w (2020).
4. H.-T. Kim and co-workers, ACS Appl. Energy Mater. 3, 4619-4628 (2020).
5. D.M. Simic et al., Composite- Part B 176, 107222 (2019).

 

13:50-14:05

Gil Markovich (TAU)
Invited Speaker

Title:
Symmetry breaking in the formation of chiral nanocrystals

Abstract:
We are interested in symmetry breaking in inorganic compounds. Many inorganic compounds crystallize in chiral space group, such as quartz, for example. Our group has been studying the breaking of left-right symmetry in the formation of nanocrystals of such compounds. We have shown, that using small chiral bio-molecules which interact with the crystals’ building blocks, it is possible to achieve such symmetry break. In particular, we have been working with the chiral TbPO4×H2O nanocrystals, and have shown that their handedness can be controlled by preparing the nanocrystals in the presence of certain natural chiral molecules, such as tartaric acid. We use circularly polarized luminescence measurements of Eu3+ dopant ions in the nanocrystals to follow the handedness and enantiomeric purity of the produced nanocrystals.[1] Using single particle circularly polarized luminescence microscopy we were able to determine the handedness of individual nanocrystals and confirmed that we obtain a single mirror image (enantiomer) of the terbium phosphate nanocrystals when prepared with tartaric acid molecules.[2]  

References
1.  U. Hananel, A. Ben-Moshe, H. Diamant, G. Markovich, Proc. Natl. Acad. Sci. USA 116, 11159-

     11164 (2019)
2.  E. Vinegrad, U. Hananel, G. Markovich, O. Cheshnovsky, ACS Nano 13, 601–608 (2019).

 

14:05-14:20

Tamar Segal-Peretz (Technion)
Invited Speaker

Title:
Atomic layer deposition onto and within polymers for controlling interfaces and nano-structuring water filtration membranes

Abstract:
Atomic layer deposition (ALD) is a powerful technique for thin layer deposition of inorganic materials on tortures, high aspect ratio, substrates. By using ALD, a wide variety of inorganic compositions can be deposited on organic and inorganic substrates with sub-nm accuracy. Here, I will present our work on ALD onto and within polymers. We show, using high-resolution electron microscopy, that controlling the diffusion time of ALD precursors dictates the metal oxide deposition through the depth of the polymeric, phase inverted, ultrafiltration membranes. With just several cycles of Al2O3 ALD, we were able to modify the polymer membranes’ interface, enhancing the membrane hydrophilicity, and oil anti-fouling behavior.  We further explore ALD within polymers, also known as sequential infiltration synthesis (SIS). In SIS, long diffusion times and precursor-polymer reactivity enables metal oxide growth within the polymers' volume, creating organic-inorganic composite materials. We performed SIS on self-assembled block copolymer (BCP) layers, where the polymer block chemistry yields selective SIS metal oxide growth in only one block. Following the growth, we removed the BCP template to obtain isoporous metal oxide membranes with enhanced pollutant selectivity.  Finally, we combine both approaches to tune the pore size and surface properties of anisotropic BCP membranes where we selectively grow metal oxides in the polymer block surrounding the pore with SIS and further perform ALD cycles to tune pore size from ultrafiltration to nanofiltration. The metal oxide pore interface allows us to control the filtration selectivity as well as be the basis for new functional moieties addition.

 

14:20-14:30

Sujit Kumar (WIS, BIU)
Contributed Speaker

Title:
Evidence for Atomic Scale Structural Dynamics of the 2D-on-3D Halide Perovskite Interfaces

Abstract:
An ultra-thin layer of 2D-on-3D Halide Perovskites (HaPs) is often reported to be beneficial in order to prevent the surface reactivity, defects and possibility of water and O2 absorption of/by 3D HaPs. However, the stability of 2D-on-3D HaP composites have often been questioned based on the results from GI-XRD and PL studies. The question of what is happening at such 2D/3D interfaces is a vexing, yet fascinating one considering that the ultimate objective of using such configurations is to gain stability while the dynamic nature of the HaPs lattices is often being reported lately. In this work, we studied FIB-(optimally) prepared cross-sections of 2D-on-3D HaP composite films by TEM-based methods. A new controlled gas-phase surface cation exchange process of the spin-coated 3D MAPbI3 film was employed to synthesize the 2D Ruddlesden-Popper FPEA2PbI4 HaP layers, where FPEA = monofluorinated derivative of phenyl-ethylamine. All through the study we strove to minimize the electron and ion fluences to lessen the effects of the beam damage on our samples. We used 4D-STEM and scanning nanobeam electron diffraction (NBED) measurements on fresh and aged (all in inert atmosphere) samples. We find evidence for the 2D n=1 phase appearing inside the 3D matrix and also for the formation of quasi 2D phases near the interface with the carbon coat. The results suggest 2D/3D perovskite heterointerface lattice rearrangements involving migration of not only (the smaller) MA+, but also of (the larger) FPEA+ cation. The structural evolution under the beam shows the loss of long-range periodicity as well structural rearrangements, leading to quasi 2D phase formation. These results thus, complement the extensive empirical and semi-empirical data to engineer stable 2D-on-3D composites and also define conditions for atomic resolution studies of 2D/3D samples in device-relevant configurations.

 

14:30-14:40

Sivan Tzadka (BGU)
Contributed Speaker

Title:
Directly moldable functional nanostructures on plastic optical flat/curve components

Abstract:
Silica glass is a traditional material for optics in the visible range. However, there has recently been an emerging interest in the optical polymer as an alternative to glass, due to the low price of raw materials, excellent optical properties, low weight, and the ability to produce freeform optical components by precision molding. However, the main obstacle toward the optical applications of polymers is the need for antireflective coatings.
Traditional antireflective coatings based on vacuum-deposited films are broadly used for glass, yet they are non-applicable for polymers, because of pure adhesion and thermal stresses they generate. An alternative to films is moth-eye subwavelength nanostructures, which produce broadband and omnidirectional antireflective effect. However, moth-eye nanostructures have not been yet implemented on polymeric optics. In this research, the application of moth-eye antireflective nanostructures on polymeric optics will be explored, by several routes.
First, the direct soft imprint of the polymer surface, covered with film which made of its own monomer mixed with UV sensitive powder, will be studied.
An additional route will be based on the precision molding of polymeric optical components with built-in antireflective structures patterned on the inner surface of the mold cavity. The study will also include optical characterization of the imprinted polymers and a demonstration of their optical function. This research will establish novel nanotechnological approaches for material nano-structuring and will pave the way to numerous applications of polymers in optics.

 

14:40-15:00

Oleg Gang (Columbia University)
Keynote Speaker

Title:
Programmable Assembly of Nanoscale Architectures

Abstract:
The ability to organize functional nanoscale components into the targeted architectures promises to enable a broad range of nanotechnological applications, from new classes of engineered biomaterials to photonic devices and chemically active media. However, we are currently lacking a broadly applicable methodology for the 3D bottom-up formation of nanostructures with ability to prescribe their architecture, to integrate different types of nanocomponents and to control their organization on different scales. The talk will present our progress in establishing a versatile self-assembly platform for the fabrication of designed large-scale and finite-size nano-architectures from diverse inorganic and biomolecular nanocomponents through the DNA-programmable assembly. The recent advances in creating periodic and hierarchical organizations from inorganic nanoparticles and proteins will be discussed. The formed 3D nanostructures can be farther transformed into fully inorganic replica via nano-templating. The use of the developed assembly approaches for generating functional nanomaterials with nano-optical, electrical, mechanical, and biochemical functions will be demonstrated.

 

15:00-15:20

Roundtable Discussion

 

Nanomaterials & Nanotechnology: the next 20 years

Moderator: Reshef Tenne (WIS)
Panel members: Gil Markovich (TAU), Tamar Segal-Peretz (Technion), Oleg Gang (Columbia Univ.)

 
 

Our Sponsors

SAVE THE DATE

IVS-IPSTA 2021 - 39th Annual Conference
November 17, 2021 | ONLINE

Conference Organizing Team


Gilbert Daniel Nessim (IVS President, BIU) | Ilya Grinberg (BIU) | Haim Barak (BIU)

Tatyana Bendikov (WIS) | Elad Koren (Technion) | Muhammad Bashouti (BGU) 
Noa Lachman-Senesh (TAU) | Igal Kronhaus (Technion)
Sharon Waichman (NRCN, Rotem Industries)