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Symposium C-2: August 30

Structure and physical properties of polymers in confined systems

We continued active discussion on structure and properties of nanoscale polymeric materials in confined system, quantum beam analysis of polymer structure and dynamics and novel polymer processing technology through the third day. We had more than 50 participants in each presentation. “Langmuir Award” and “Soft Matter Award” were provided to our symposium by courtesy of the ACS publications and Royal Society for Chemistry. The presentations, which is given by young researchers, were judged by the aid of invited speakers of our symposium and the symposium organizers (totally 17 reviewers from 5 countries) have selected following four award winners.

Congratulations!!

Langmuir Award

C2-P28-011
Aggregation States of Polymer Inclusion Complexes at Water Interface
Hidenobu TANEDA(Kyushu University, Fukuoka, Japan)

C2-P28-005
Precise Synthesis of Stereoregularity-controlled PMMA-b -PDMS-b -PMMA and Characterization of Its Molecular Aggregation Structure
Hitoshi SHIMAMOTO(Kyushu University, Fukuoka, Japan)

Soft Matter Poster Award

C2-P28-023
Preparation of High-Density Polyethylene Nanocomposites Well Reinforced by Cellulose Nanofiber Using Diblock Copolymer-type Dispersants
Keita SAKAKIBARA(Kyoto University, Uji, Japan)

Soft Matter Presentation Award

C2-O30-019
Interfacial Modifications of Thin Films by　Preferential Segregation of Janus Macromolecules
Yukari ODA(Kyushu University, Fukuoka, Japan)

After the final day of session C-2. Many people stay until the end of the session.

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Symposium D-2 : Eco-product session

The symposium D-2 oral session started from August 30. The organizer (Prof. Toshihiro OKABE) introduced significance of this  symposium. There has been a strong demand for environmentally friendly product in the globe. This session aim to promote environmentally friendly products.

In the morning on August 31(2nd day), we had 3 oral papers and 2 invited lectures. In invited lectures,Tongxiang FAN of School of Materials Science and Engineering ,Shanghai Jiaotong University, “R&D of wood ceramics and porous carbon in China”. In China,18 universities and 1 institute are researching in these grounds. He introduced the characteristics of research about 7 universities and 1 institute.

Kanehiko UTSUNO of Jingushicho explained about the sanctuary reconstruction in the Shikinen Sengu of Ise Jingu. He introduced the history, the method of reconstruction, the reuse of old wooden building materials, the prevention of corrosion and the lasting for  wooden building materials and saw grass in the Shikinen Sengu.

In the afternoon, we had the poster session. 21poster papers were presented with active discussion and question and answer.(4 poster papers presented on August 29).

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Symposium A-4: Magnetic Oxide Thin Films and Hetero-strictures

Unique Electronic Structures and Properties of Oxide Thin Films and Multilayers

There were many interesting presentations about unique electronic structures as well as magnetic and electrical properties of oxide thin films and multilayers in this symposium. The oxide compounds for which the electronic structures and properties were reported are SrTiO3, BiFeO3, Bi(Fe,Co)O3, (La,Sr)MnO3, LaNiO3, LaMnO3, YBa2Cu3O7, Y3Fe5O12, Gd3Ga5O12, Y(Mn,Cr)O3, LaCa2Fe3O8, SrRuO3. Two keynote lectures given by C. G. Van De Walle and H.-U. Habermeier clearly indicate that there exist some critical factors, which have great influence on the electrical conductivity and magnetization, such as carrier density, number of oxygen vacancy, distortion of crystal structure, strain induced in thin films. For the case of SrTiO3 thin films which have point defects, as suggested by two invited presentations (A. Schulman and F. Gunkel), the temperature dependence of resistivity manifests the Kondo-effect-like behavior depending on the oxygen partial pressure and carrier density. The charge transfer in multilayers such as SrTiO3/GdTiO3 (C. G. Van De Walle, as mentioned above) and LaNiO3/LaMnO3 (M. Kitamura) also plays an important role to determine transport properties as well as magnetic structure. Other topics include interest magnetic domain patterns in composites between ferromagnetic metals and oxide superconductor (A. Palau), spin Hall effect and electrically driven magnetization dynamics in Y3Fe5O12 (A. Hoffmann), and spin Seebeck effect in paramagnetic and antiferromagnetic thin films (A. Bhattacharya). There were many active discussions about those topics concerning magnetic oxide thin films and hetero-structures.

A scene of symposium A-4

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PL-5 Inorganic Graphene Analogues: Recent Results

C.N.R. RAO, National Research Professor
Wednesday, August 30, 2017　12:00-12:40

Prof. Rao, National Professor and Linus Pauling Research Professor at the Jawaharlal Nehru Center for Advanced Scientific Research, passionately explained the wonders of the low dimensional nanostructures and the layered 2D materials including MoS2, WS2, GaS, BN, and carbon nitrides and their fascinating properties including high surface area, band gaps and porosity. He beautifully explained how these materials can conquer the world of advanced materials research by offering amazing performance in many applications including energy storage, hydrogen generation, optoelectronic devices, magnetism, superconductivity, and catalysis.

As we all expected, Rao presented several strategies to make a library of new advanced nanostructures. One of the main highlights of his talk is the novel strategies for generating covalently linked heterostructures of different two-dimensional layered materials whose properties are completely different from those of van der Waals heterostructures. By simply using Sonogashira coupling and carbodimide based coupling, his groups generated ladder-like multilayered structures which cannot be prepared by a simple van der Waals interactions. Unique strategies have been presented to fabricate graphene coupled with 1D, 2D and zero dimensional metal organic frameworks. At one point, the audience wondered what materials and the research topic Prof. Rao missed in his talk as he covered the topics including materials chemistry, organic chemistry, physics, theoretical chemistry, nanochemistry, etc. It was absolutely a mesmerizing talk and offered the researchers a pool of novel ideas and venues to work on advancing the nanomaterials research. The performance of these nanostructures have been amazingly demonstrated in hydrogen generation via photocatalytic water splitting, electrocatalysis and heterogeneous catalysis.

On the fundamental side, Prof. Rao presented the interaction of electron donar and acceptor molecules and their relation with the electronic structure and properties of these new class of materials including phospherenes. At the end of the talk, he told the audience that the covalently bonded heterostructures are just the beginning and a lot of new structures to be explored including chalcogenides-chalcogenides, Chalcogenides-nitrides, and/or with arsenene or germanane. These unique materials are going to make a revolution in the field of advanced materials science and energy generation which eventually help to protect the people and economy.

Posted by Prof. Ajayan Vinu, FRSC
Future Industries Institute, University of South Australia

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Active discussions were done in the B-6 poster session on Aug.30 (WED)

This session was planned to discuss various possibilities for the sudden rise in advanced ceramics and glasses extensively from the viewpoint of structural formation.
We had 10 invited talks, 13 oral presentations, and 24 poster presentations. The speakers came from China, Taiwan, Korea, Thailand, Mexico and Japan. On the 1st day evening and the 3rd day afternoon, we had poster session. Young students and middle-aged experts (professors, research experts) were mixed there and enjoyed their discussions. Some photos are shown below.
Finally, all the organizers greatly expressed their gratitude to all poster presenters of this session, and also organizing committees of IUMRS-ICAM2017.

Fig.1 Group Photo of Mexico attendees.

 

 

 

 

 

 

 Fig.2 Poster presenter from Taiwan.

 

 

 

 

 

 

Fig.3 Poster presenter from Taiwan.

 

 

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A6: Forefront of the functional development of strongly correlated materials

Talk by Prof. Anil P S KUMAR (MRS India)

Granularity controlled topological phase

Prof. Anil P S KUMAR from Department of Physics, Indian Institute of Science, Bangalore, India, delivered a review talk for granular topological insulators. In this symposium, a focused session for topological materials was arranged inside and Prof. Xi Dai from Institute of Physics, Chinese Academy of Science shortly reviewed the progress of research of topological materials, followed by several invited talks for theoretical and experimental studies. The topological material is expected to be useful in technologies especially for quantum computing and highly sensitive magnetic sensors, although it has not been practical for many years. However, recent progress of materials development of topological insulator makes the situation changed. In the early generation of topological materials nearly massless and very fast electrons run only on the surfaces and edges of materials; however, recent topological materials show unique and useful transport properties of bulk, suggesting increasing possibilities for applications. In this session, audiences reviewed recent progress of theoretical and experimental studies of topological materials.

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Presentation for Forum 2 (Aug.30)

Day 1 of the Forum on Advanced Materials Science and Technology for Cultural Assets showed the diversity of applications of technologies used for material processing and analysis and the implications of these technologies and techniques.

Professor Ari-Ide Ektessabi introduced the Forum touching on the wide range of content across the presentations, and introduced the important work of the Ide Advanced Imaging Laboratory for the field of cultural heritage digitisation.

Opening the presentations Dr. Marjid Sarmadi addressed the importance of high resolution scanning for digitising significant cultural heritage for future generations. Mr Sarmadi detailed the process, outcomes and purpose of the project to digitise the Helen Louise Allen Textile collection of the school of Human Ecology at the University of Wisconsin-Madison

Artist and academic Chelsea Lehmann discussed the aesthetic and perceptual impacts of advanced imaging techniques, exploring the ways in which these technologies and their outcomes can connect to, inspire or even ‘be’ art.

The third presentation was by art historian and curator Yoko Sanekata.

Ms. Sanekata discussed the imaging and restoration process for the Buddhist painting “Water-Moon Avalokiteśvara” by artist So Guban in which high-resolution, microscopic photography, and X-ray fluorescence analysis were used to determine the state of the painting on silk, and the appropriate restoration process.

Finally Mr. Tomita, a medical doctor and engineer discussed the ambivalence of technology in both medical practice and engineering, emphasising the difference between ‘fact’ and ‘irreplaceable’ reality. His presentation focussed on the philosophical and creative questions that arise through the use of technology in various disciplines.

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Symposium A-5: Session THIN FILMS, MULTILAYERS, NANOSTRUCTURES I / Aug. 30

Prof. Chunlei Wan (Tsinghua University, China) presented high-performance inorganic / organic superlattices for flexible thermoelectric energy harvesting.

The authors showed thermoelectric properties of organic molecule cation intercalated TiS2 (electrochemically), which looks like superlattice (layered structure). They successfully reduced the thermal conductivity while maintain its rather high electrical conductivity. Positively charged organic cations play several important roles such as good donor (strong positive electric field), enhancement of two-dimensionality, and reducing agent of thermal conductivity.

Prof. Kyu Hyoung Lee (Kangwon National University, Korea) presented design and preparation of high performance thermoelectric materials with defect structures.

The authors showed interesting way to enhance thermoelectric figure of merit of several materials such as BiSbTe, BiTeSe, and half-Heusler. They successfully reduced the thermal conductivity by introducing dislocation arrays at around the grain boundaries. They achieved 30-50% enhancement of their zT.

Prof. Wei Liu (Wuhan University of Technology) presented an invited talk on “Growth and transport properties of tetradymite thin films”.

The authors discussed their interesting results for MBE grown Bi2Te3/Sb2Te3 superlattice and solid-solution thin films; for the film characterization used techniques such as STS to investigate topological insulator properties. For the solid-solution thin films the doping was controlled from n-type to p-type depending on the Bi/Sb ratio.

Dr. Jihui Yang ? (instead of Yonggao Yan; Wuhan University of Technology) presented a contributed talk on “Rapid fabrication of thermoelectric SnTe via non-equilibrium lased 3D printing and the finite element simulation”.

The authors were able to fabricate high-quality 25 µm-thick SnTe films with selective laser melting (SLM). By controlling the power of the laser and thereby decreasing the melting temperature used the quality of the films could be improved.

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Plenary Lecture 4 / 5

The plenary lecture 4 on carbohoration by Suzuki coupling was delivered by a novel lauriate of professor Suzuki at the Hokaito University, Japan.  And then the plenary lecture 5 on Inorganic Graphene Analogues Recent Results was delivered in the same auditorium by Professor C.N.R. Rao at the Jawaharlal Nehru Centre for Advanced Scientific Research,Bangalore, India.

These two speakers are still healthy even though over 80 years old and still have very strong energy and enthusiasm without aging effect. Professor Rao have carried out research on  materials chemistry on various functional inorganic materials. He described new 2D materials for H2 evolution as followings:  Several years ago graphene has been a sensational discovery and there are so many publications on graphene and graphene oxide. These nanosheet materials are called 2D materials. Particularly graphene is conductive materials, but not semiconductor. In the last two to three years, there has been effort to prepare graphene-like layered inorganic materials such as MoS2, WS2, GaS and BN. Several methods of synthesis of such nanosheets have been developed. Some of the recent results on few-layer transit metal chalcogenides(TMC) such as as SnSe, MoSe, WSe, and BN was presented. Specially interesting are the physical properties of these nano materials such as magnetism and superconductivity. Transistors and devices have been fabricated with many of the layered inorganic materials. A new graphene-like material is BxCyNz with high surface area and novel gas adsorptive properties. These materials have other extraordinary properties, their use as electrocatalysts being specially noteworthy. Specially noteworthy are the novel materials obtained by cross linking MoS2 with other 2D materials or by functionalizing MoS2 sheets. Thus, interaction of electron donor and acceptor molecules has unraveled the electronic structure and properties of phospherene. Covalent cross-linking C3N4 and MoS2 favors photochemical splitting of water. TIO2 was very good photocatalytic materials, however, the H2 evolution efficiency was not enough.  2D materials can be made by sonochemistry method  and chemical decomposing, and adding another functional groups by Suzuki coupling method.  This Suzuki coupling method was well introduced by the former plenary speaker.  These 2D nano materials of MoS2, SnSe, graphene and BN can be functionalzed by adding another group such as MOF (metal organic frame materials) between the mono layers of  2D materials by Suzuki coupling method.  These functionalized 2D materials showed the 10 times higher than the current developed semiconductor materials for water splitting.

After the plenary lecture, there was only one question.  It was “What is the chemical bonding between 2D materials and functional groups?  It is a covalent bonding”

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Symposium A-3: Session FBS I / August 30th

Chairpersons: Akiyasu YAMAMOTO and Valeria BRACCINI 

A3-K30-001 Keynote
Vortex Pinning in iron based superconductors
Kees VAN DER BEEK

Jc and Hc2 in IBS look very interesting but way lower than in HTS (in particular in YBCO): the phase 1111 is the better performing in this respect. Flux pinning mechanisms look similar in all IBS, and have been extensively studied and presented in this talk.

Pinning centers can be nm-size inclusions, dislocations or Fe vacancies (in particular in FeSe single crystals, see very recent work by Sprau et al., 357 (2017) 65).

Jc vs field has been extensively investigated, and presents a similar behaviour in various materials. After a plateau where Jc is constant, it decreases proportionally to B^-0.5, then again it smoothest down. At low field it is predominant the contribution from big grains, isolated vortices (strong pinning on a nm scale), at intermediate fields we have collective pinning due to charged dopants / vacancies.

The depairing current density has been investigated: it presents a dome as a function of the doping, as it happens for the Tc vs x.

Vortex pinning has been correlated to the behaviour of l.

The multiple band character of superconductivity has a strong influence on Jc and on its anisotropy, which in particular in the ab direction is strongly related to the anisotropy of x.

 A3-I30-003 Invited 

Arsenic Chemistry of Iron-based Superconductors and Strategy for New Superconducting Materials
Minoru NOHARA

Prof. Nohara reported the progress of iron-based superconducting materials with the emphasis on the valence states and chemical bonds of arsenic. They demonstrated that in the novel 112-type CaFeAs2, monovalent arsenic produced As zigzag chains of CaAs intermediary layers, while trivalent arsenic produced FeAs layers. The superconducting transition temperature of this materials was enhanced up to 47 K when La and Sb were simultaneously substituted for Ca and As, respectively. Sb is preferably substituted for the As of the zigzag chains. On the other hand, in the 10-4-8-type Ca10(Pt4As8)(Fe2−xPtxAs2)5 with the highest Tc of 38 K, he emphasized that divalent arsenic produced As2 dimers in Pt4As8 layers. Finally, he discussed the structural phase transition in 122-type CaFe2As2 that is characterized by the formation of As2 dimers between the adjacent FeAs layers, which resulted in the loss of magnetism and disappearance of superconductivity. This transition can be viewed as an As2-/As3- valence transition.

  

A3-I30-002 Invited 

Doping dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
Hiroshi EISAKI

Dr. Eisaki reported the in-plane critical current density (Jc) of BaFe2As2-based superconductors, Ba1-xKxFe2As2 (K-Ba122), Ba(Fe1-xCox)2As2 (Co-Ba122), and BaFe2(As1-xPx)2 (P-Ba122) in a wide range of doping concentration (x) by means of magnetization hysteresis loop (MHL) measurements on single crystal samples. Depending on the dopant elements and their concentration, Jc exhibits a variety of magnetic-field (H)- and temperature (T)- dependences. In the case of K-Ba122, the MHL of the under-doped samples (x < 0.33) exhibits the second magnetization peak (SMP), which sustains high Jc at high H and high T, exceeding 105 A/cm2 at T = 25 K and μ0H = 6 T for x = 0.30. On the other hand, the SMP is missing in the optimally- (x ~ 0.36-0.40) and overdoped (x ~ 0.50) samples, and consequently Jc rapidly decreases by more than one order of magnitude, although the change in Tc is within a few K. He pointed out that the T-dependent Jc indicates that the two pinning mechanisms, namely, the spatial variations in Tc (referred to as delta-Tc pinning) and the fluctuations in the mean free path (delta-l pinning), are enhanced for the under-doped samples, which results in the enhancement of Jc. Possible origins for the different pinning mechanism are discussed in connection with the x-dependence of Tc, the residual resistivity, AFO domain boundaries, a possible quantum critical point, etc.

 

A3-K30-004 Invited

Pressure Effects of FeSe by Novel DAC using metallic Diamond Electrodes
Yoshihiko TAKANO

A deep work published very recently (Matsumoto et al., JJAP 56 (2017)) has been presented, regarding the pressure effects induced in FeSe single crystals by a novel Diamond Anvil Cell.

Superconducting properties of many different materials under high pressure have recently received great attention, especially after the discovery with great surprise of superconductivity in H2S at ∼200 K under 150 GPa which was reported by resistivity measurements using a diamond anvil cell (DAC) in 2015. In fact, if one can measure the resistivity under extremely higher pressure above 300 GPa, superconductivity at room temperature in light elements such as hydrogen would be observed.

The resistivity measurement though is difficult because the sample space is very small (<100 μm) and the electrodes are deformed by compression. A novel diamond anvil cell specialized for resistivity measurements under high pressure has been developed at NIMS, Tsukuba. Once metallic diamond is heavily boron-doped, it shows metallicity and superconductivity at low temperature. Boron-doped metallic diamond electrodes were deposited onto a diamond anvil using a electron beam lithograph: in this way, resistivity measurements can be performed up to 10 GPa.

In particular, results obtained through this technique on FeSe single crystals have been reported. FeSe shows a Tc of 8 K, which can increase up to 37 K with the application of idrostatic pressure (8 GPa). When uniaxial pressure is applied, at NIMS they were able to reach Tc as high as 44 K, similarly to what happens in FeSe phase after K intercalation. This Tc increase depends on the anion height from the Fe layer which can be changed through the intercalation or through the application of the uniaxial pressure.