Research activity information

• May 2006, 日本レオロジー学会, 論文賞

• Theory and Practical Application of Passive Microrheology －Diffusing-wave Spectroscopy Microrheology－
  Tsutomu Indei; Tetsuharu Narita
  Journal of Oleo Science, 23, 9, 483, 489, Sep. 2023, [Invited]
  Japanese, Scientific journal
• Inverse mechanical-swelling coupling of a highly deformed double-network gel
  Chika Imaoka; Tasuku Nakajima; Tsutomu Indei; Masaya Iwata; Wei Hong; Alba Marcellan; Jian Ping Gong
  Science Advances, 9, 19, American Association for the Advancement of Science (AAAS), 10 May 2023, [Peer-reviewed], ［Internationally co-authored］
  English, Scientific journal, Mechanical behaviors of a polymer gel are coupled with its swelling behavior. It has been known that typical hydrogels display extension-induced swelling and drying-induced stiffening, called normal mechanical-swelling coupling. In this study, we experimentally found that highly extended double-network (DN) hydrogels exhibit abnormal inverse mechanical-swelling coupling such as extension-induced deswelling and drying-induced softening. We established theoretical hyperelastic and swelling models that reproduced all the complicated mechanical and swelling trends of the highly deformed DN hydrogels. From these theoretical analyses, it is considered that the inverse mechanical-swelling coupling of a DN gel is derived from the extreme nonlinear elasticity of its first network at its ultimate deformation state. These findings contribute toward the understanding of the mechanics of rubber-like materials up to their ultimate deformation and fracture limit.
• Relaxation mechanisms in hydrogels with uniaxially oriented lamellar bilayers
  Anaïs Giustiniani; Muhammad Ilyas; Tsutomu Indei; Jian Ping Gong
  Polymer, 267, 125686, 125691, Elsevier BV, Feb. 2023, [Peer-reviewed]
  English, Scientific journal
• Microrheological study of single chain dynamics in semidilute entangled flexible polymer solutions: Crossover from Rouse to Zimm modes
  Tsutomu Indei; Tetsuharu Narita
  Journal of Rheology, 66, 1165, 1179, Nov. 2022, [Peer-reviewed]
  English, Scientific journal
• A simple microswimmer model inspired by the general equation for nonequilibrium reversible–irreversible coupling
  Andrés Córdoba; Jay D. Schieber; Tsutomu Indei
  Journal of Chemical Physics, 152, 194902, May 2020, [Peer-reviewed]
  English, Scientific journal
• Relaxation Dynamics and Underlying Mechanism of a Thermally Reversible Gel from Symmetric Triblock Copolymer
  Ya Nan Ye; Kunpen Cui; Tsutomu Indei; Tasuku Nakajima; Dominique Hourdet; Takayuki Kurokawa; Jian Ping Gong
  MACROMOLECULES, 52, 22, 8651, 8661, Nov. 2019, [Peer-reviewed]
  English, Scientific journal
• Interplay of entanglement and association effects on the dynamics of semidilute solutions of multisticker polymer chains
  M. E. Shivokhin; T. Narita; L. Talini; A. Habicht; S. Seiffert; T. Indei; J. D. Schieber
  Journal of Rheology, 61, 1231, Nov. 2017, [Peer-reviewed]
• Theoretical analysis of critical flowable physical gel cross-linked by metal ions and polyacrylamide-derivative associating polymers containing imidazole groups
  Hiroto Ozaki; Tetsuharu Narita; Tsuyoshi Koga; Tsutomu Indei
  Polymers, 9, 256, Jun. 2017, [Peer-reviewed]
• Reexamination of multi-component non-ideal polymer solution based on the General Equation for Non-Equilibrium Reversible-Irreversible Coupling
  Tsutomu Indei; Jay D. Schieber
  Journal of Chemical Physics, 146, 184902, May 2017, [Peer-reviewed]
  English, Scientific journal
• Physical gelation of supramolecular hydrogels cross-linked by metal-ligand interactions: Dynamic light scattering and microrheological studies
  Hiroto Ozaki; Tsutomu Indei; Tsuyoshi Koga; Tetsuharu Narita
  Polymer, 128, 363, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• Microrheological study of physical gelation in living polymeric networks
  Tetsuharu Narita; Tsutomu Indei
  Macromolecules, 49, 4634, Jun. 2016, [Peer-reviewed]
  English, Scientific journal
• A boundary integral method for computing forces on particles in unsteady Stokes and linear viscoelastic fluids
  H. Feng; A. Córdoba; F. Hernandez; T. Indei; S. Li; X. Li; J. D. Schieber
  International Journal for Numerical Methods in Fluids, 82, 198, Jan. 2016, [Peer-reviewed]
  English, Scientific journal
• Determination of linear viscoelastic properties of an entangled polymer melt by probe rheology simulations
  Mir Karim; Tsutomu Indei; Jay D. Schieber; Rajesh Khare
  Physical Review E, 93, 012501, Jan. 2016, [Peer-reviewed]
  English, Scientific journal
• The role of filament length, finite-extensibility and motor force dispersity in stress relaxation and buckling mechanisms in non-sarcomeric active gels
  Andrés Córdoba; Jay D. Schieber; Tsutomu Indei
  Soft Matter, 11, 38, 2015, [Peer-reviewed]
  English, Scientific journal
• Correction of Doi-Edwards' Green function for a chain in a harmonic potential and its implication for the stress-optic rule
  Jay D. Schieber; Tsutomu Indei
  Journal of Polymer Science Part B: Polymer Physics, 52, 460, Jan. 2014, [Peer-reviewed]
  English, Scientific journal
• Fluctuating junctions of physically cross-linked networks in a single-chain model, - Consistency between the relaxation modulus for small deformations and Green-Kubo predictions -
  Tsutomu Indei
  Journal of the Society of Rheology, Japan, 42, 111, 2014, [Peer-reviewed]
  English, Scientific journal
• A single-chain model for active gels I: Active dumbbell model
  Andrés Córdoba; Jay D. Schieber; Tsutomu Indei
  RSC Advances, 4, 17935, 2014, [Peer-reviewed]
  English, Scientific journal
• The analytic solution of Stokes for time-dependent creeping flow around a sphere: application to linear viscoelasticity as an ingredient for the Generalized Stokes-Einstein relation and microrheology analysis
  Jay D. Schieber; Andrés Córdoba; Tsutomu Indei
  Journal of Non-Newtonian Fluid Mechanics, 200, 3, Sep. 2013, [Peer-reviewed]
  English, Scientific journal
• Fluctuating entanglements in single-chain mean-field models
  Jay D. Schieber; Tsutomu Indei; Rudi J; A. Steenbakkers
  Polymers, 5, 643, Jun. 2013, [Peer-reviewed]
  English, Scientific journal
• The effects of compressibility, hydrodynamic interaction and inertia on two-point, passive microrheology of viscoelastic materials
  Andrés Córdoba; Tsutomu Indei; Jay D. Schieber
  Soft Matter, 9, 3521, 2013, [Peer-reviewed]
  English, Scientific journal
• Effects of fluctuations of cross-linking points on viscoelastic properties of associating polymer networks
  Tsutomu Indei; Jay D. Schieber; Jun-ichi Takimoto
  Rheologica Acta, 51, 1021, Nov. 2012, [Peer-reviewed]
  English, Scientific journal
• The effects of hydrodynamic interaction and inertia in determining the high-frequency dynamic modulus of a viscoelastic fluid with two-point passive microrheology
  Andrés Córdoba; Jay D. Schieber; Tsutomu Indei
  Physics of Fluids, 24, 073103, Jul. 2012, [Peer-reviewed]
  English, Scientific journal
• Competing effects of particle and medium inertia on particle diffusion in viscoelastic materials, and their ramifications for passive microrheology
  Tsutomu Indei; Jay D. Schieber; Andrés Córdoba
  Physical Review E, 85, 041504, Apr. 2012, [Peer-reviewed]
  English, Scientific journal
• Determination of viscoelastic properties by analysis of probe particle motion in molecular simulations
  Mir Karim; Swapnil C. Kohale; Tsutomu Indei; Jay D. Schieber; Rajesh Khare
  Physical Review E, 86, 051501, Apr. 2012, [Peer-reviewed]
  English, Scientific journal
• Treating inertia in passive microbead rheology
  Tsutomu Indei; Jay D. Schieber; Andrés Córdoba; Ekaterina Pilyugina
  Physical Review E, 85, 021504, Feb. 2012, [Peer-reviewed]
  English, Scientific journal
• Elimination of inertia from a generalized Langevin equation: Applications to microbead rheology modeling and data analysis
  Andrés Córdoba; Tsutomu Indei; Jay D. Schieber
  Journal of Rheology, 56, 185, Jan. 2012, [Peer-reviewed]
  English, Scientific journal
• Linear viscoelastic properties of transient networks formed by associating polymers with multiple stickers
  Tsutomu Indei; Jun-ichi Takimoto
  Journal of Chemical Physics, 133, 194902, Nov. 2010, [Peer-reviewed]
  English, Scientific journal
• Effects of surfactants on the linear rheology of telechelic associating polymers
  Tsutomu Indei
  Progress in Colloid & Polymer Science, 136, 23, 2009, [Peer-reviewed]
  English, Scientific journal
• Rheological study of transient networks with junctions of limited multiplicity
  Tsutomu Indei
  JOURNAL OF CHEMICAL PHYSICS, 127, 14, 144904, AMER INST PHYSICS, Oct. 2007, [Peer-reviewed]
  English, Scientific journal
• Rheological study of transient networks with junctions of limited multiplicity. II. Sol/gel transition and rheology
  Tsutomu Indei
  JOURNAL OF CHEMICAL PHYSICS, 127, 14, 144905, AMER INST PHYSICS, Oct. 2007, [Peer-reviewed]
  English, Scientific journal
• Necessary conditions for shear-thickening in associating polymer networks
  Tsutomu Indei
  Journal of Non-Newtonian Fluid Mechanics, 141, 18, 2007, [Peer-reviewed]
  English, Scientific journal
• Effect of nonlinearity strength in chain tension on shear-thickening of associating polymer networks
  Tsutomu Indei
  Journal of the Society of Rheology, Japan, 35, 147, 2007, [Peer-reviewed]
  Japanese, Scientific journal
• Theory of shear-thickening in transient networks of associating polymers
  Tsutomu Indei; Tsuyoshi Koga; Fumihiko Tanaka
  Macromolecular Rapid Communications, 26, 701, 2005, [Peer-reviewed]
  English, Scientific journal
• Rheological study of transient polymer networks cross-linked by two-component associative groups, - Inversion of the gel skeletal structure-
  Tsutomu Indei; Fumihiko Tanaka
  Journal of Rheology, 48, 641, May 2004, [Peer-reviewed]
  English, Scientific journal
• Analysis of shear-thickening in physical gel by transient network theory
  Tsutomu Indei; Toshihico Arimitsu
  AIP Conference Proceedings of “The 3rd International Symposium on Slow Dynamics in Complex Systems”, 708, 225, 2004, [Peer-reviewed]
  English, International conference proceedings
• Theory of Transient Polymer Networks Crosslinked by Two Different Associative Groups
  INDEI Tsutomu; TANAKA Fumihiko
  NIHON REOROJI GAKKAISHI, 32, 5, 285, 293, The Society of Rheology, Japan, 2004, [Peer-reviewed]
  English, Scientific journal, Co-associating polymers (CAP) are new type of polymers carrying two different species of associative groups along the polymer backbone. Transient gels of CAP show many new interesting thermodynamical and rheological properties such as network inversion, reentrant gelation etc. In this paper, we study linear viscoelasticity of physical gels formed by CAP on the basis of transient network theory. Model CAP to be treated here are difunctional (A-B) and trifunctional (A-A-B) linear polymers, where A and B stand for the associative groups. It turns out that the dynamic shear moduli of difunctional (heterotelechelic) A-B polymers behave like a Maxwell fluid with a single relaxation time τ^AB=1/(β^A+β^B), where βⁱ(i =A, B) are the dissociation rates of associative groups from the network junctions. On the other hand, shear moduli of trifunctional A-A-B polymers are well described by the two-mode Maxwell model with two relaxation times τ^AB and τ^AA=1/(2β^A) when A groups are much less frequently dissociated from the junctions compared with B groups. In such case, structural transformations of the network are expected to occur at a characteristic frequency ω≈1/ τ^AB where two distinct rubbery plateaux meet.

• Physical gelation of supramolecular hydrogels cross-linked by metal ligand interactions: Dynamic light scattering and microrheological studies
  H. Ozaki; T. Indei; T. Koga; T. Narita, Advances in Engineering, 2017, [Invited]
  English, Introduction commerce magazine
• Viscoelastic properties of associating Rouse chains
  T. Indei; J. Takimoto, Hot Topics in Polymer Science in Japan, 58, 724, Oct. 2009, [Peer-reviewed], [Invited]
  English, Report scientific journal

• 高周波パッシブマイクロレオロジーの原理
  印出井努
  第30回 高分子計算機科学研究会講座「高分子の階層性に応じたシミュレーション手法の基礎から応用」, 16 Jul. 2026, Japanese, Public discourse
  [Invited]
• Predicting the tension of single polymer chain from the stress of highly-stretched polymer network
  T. Indei; T. Matsuda; T. Nakajima; T. B. Kouznetsova; M. Rubinstein; S. L. Craig; J. P. Gong
  9th ASIA-Pacific Rim Conference on Rheology, 25 Jul. 2025, English, Oral presentation
  20 Jul. 2025 - 25 Jul. 2025
• Force fingerprints” of single polymer chain observed by stretching macroscopic polymer network
  T. Indei; T. Matsuda; T. Nakajima; Y. Takahashi; T. B. Kouznetsova; M. Rubinstein; S. L. Craig; J. P. Gong
  Hokkaido University-LeNet International Symposium, Low Entropy Soft Matter, 12 Feb. 2025, English, Oral presentation
  12 Feb. 2025 - 14 Feb. 2025
• 高分子網目のレオロジー、熱力学、力学物性
  印出井努
  関東高分子若手研究会2024ミニシンポジウム, 28 Sep. 2024, Japanese, Invited oral presentation
  27 Sep. 2024 - 28 Sep. 2024, [Invited]
• Theoretical study for hysteretic stress-strain behavior of highly-stretched double-network gels
  印出井 努; 松田 昂大; 中島 祐; Tatiana B. Kouznetsova; Stephen L. Craig; 龔 剣萍
  第73回高分子学会年次大会, 05 Jun. 2024, Japanese, Oral presentation
  05 Jun. 2024 - 07 Jun. 2024
• Theoretical prediction of stress-strain behavior observed in highly-stretched polymer networks
  印出井 努; 松田 昂大; 中島 祐; 高橋 由葵子; Tatiana B. Kouznetsova; Michael Rubinstein; Stephen L. Craig
  72nd Symposium on Macromolecules, 27 Sep. 2023, Japanese, Oral presentation
  26 Sep. 2023 - 28 Sep. 2023
• Mechanical fingerprints of single polymer chain in stretched macroscopic polymer network
  T. Indei; T. Matsuda; T. Nakajima; Y. Takahashi; T. B. Kouznetsova; M. Rubinstein; S. L. Craig; J. P. Gong
  XIXth International Congress on Rheology (ICR2023), English, Oral presentation
  29 Jul. 2023 - 04 Aug. 2023
• Mechanical fingerprints of single polymer chain derived from stretched macroscopic polymer network
  T. Indei; T. Matsuda; T. Nakajima; Y. Takahashi; T. B. Kouznetsova; M. Rubinstein; S. L. Craig; J. P. Gong
  The 13th SPSJ International Polymer Conference, 20 Jul. 2023, English, Oral presentation
  18 Jul. 2023 - 21 Jul. 2023
• Mechanical property of single polymer chain derived from polymer network’s stress-strain relation
  印出井努; 松田昂大; 中島祐; 高橋由葵子; Kouznetsova Tatiana; Michael Rubinstein; Stephen Craig; 龔剣萍
  72nd SPSJ Annual Meeting, 25 May 2023, Japanese, Oral presentation
  24 May 2023 - 26 May 2023
• 凖希薄絡み合い高分子溶液のRouseモードとZimmモードのクロスオーバーに関するマイクロレオロジー研究
  印出井努; 成田哲治
  第70回 レオロジー討論会, 13 Oct. 2022, Japanese, Oral presentation
  13 Oct. 2022 - 14 Oct. 2022
• Microrheological study of semi-dilute entangled polymer solutions
  Tsutomu Indei; Tetsuharu Narita
  第71回 高分子討論会, 06 Sep. 2022, Japanese, Oral presentation
  05 Sep. 2022 - 07 Sep. 2022
• An approach to extract single chain force-extension curve from stress-stain behavior of its network gel
  T. IndeiT.; MatsudaT.; NakajimaY.; TakahashiT.; B. Kouznetsova†M. Rubinstein†S. L. Craig†J.; P. Gong
  13th International Gel Symposium, 03 Sep. 2022, English, Oral presentation
  02 Sep. 2022 - 04 Sep. 2022
• Identifying mechanical fingerprints of single polymer chain in deformed macroscopic polymer network
  Tsutomu Indei; Takahiro Matsuda; Tasuku Nakajima; Yukihiro Takahashi; Tatiana Kouznetsova; Michael Rubinstein; Stephen Craig; Jian Ping Gong
  DoDyNet Final Conference on Double Dynamic Networks, 25 May 2022, English, Keynote oral presentation
  24 May 2022 - 27 May 2022
• マイクロレオロジーによる， 凖希薄絡み合い高分子溶液の 一本鎖ダイナミクスの研究
  印出井 努; 成田 哲治
  レオロジー学会 第49年会, 13 May 2022, Japanese, Oral presentation
  12 May 2022 - 13 May 2022
• 網目を形成する高分子鎖の力学的「フィンガープリント」
  印出井 努; 松田 昂大; 中島 祐; 高橋 由葵子; Tatiana B. Kouznetsova; Stephen L. Craig; Michael Rubinstein; 龔剣萍
  第69回レオロジー討論会, 22 Oct. 2021, Japanese, Oral presentation
  21 Oct. 2021 - 22 Oct. 2021
• 高分子ゲルの応力特性から抽出した、高分子鎖の力学的「フィンガープリント」の解析
  印出井 努; 松田 昂大; 中島 祐; 高橋 由葵子; Tatiana B. Kouznetsova; Michael Rubinstein; Stephen L Craig; 龔 剣萍
  第70回高分子討論会, 07 Sep. 2021, Japanese, Oral presentation
  06 Sep. 2021 - 08 Sep. 2021
• Extraction of polymer chain's force-extension relation from stress-strain relation of polymer network
  印出井 努; 松田 昂大; 中島 祐; 高橋 由葵子; Tatiana; B. Kouznetsova; Michael Rubinstein; Stephen L. Craig; 龔剣萍
  第68回レオロジー討論会, 21 Oct. 2020, Japanese, Oral presentation
  21 Oct. 2020 - 22 Oct. 2020
• Extraction of polymer chain's force-extension curve from stress-strain curve of polymer gel
  印出井努; 松田 昂大; 高橋 由葵子; Stephen Craig; Michael Rubinstein; 中島 祐; 龔 剣萍
  第68回高分子討論会, 26 Sep. 2019, Japanese, Oral presentation
  25 Sep. 2019 - 27 Sep. 2019
• Interplay of entanglement and association effects on the dynamics of semidilute solutions of multisticker polymer chains
  T. Indei; M. E. Shivokhin; T. Narita; L. Talini; A. Habicht; S. Seiffert; J. D. Schieber
  SUPOLEN: Final Conference on the structure and dynamics of associating polymers and supramolecular assemblies, Sep. 2017, English, Invited oral presentation
  Sep. 2017 - Sep. 2017, [Invited]

• 物理学Ⅱ, 2024年, 学士課程, 全学教育

• Present
  The Society of Rheology, Japan
• The Society of Polymer Science, Japan

• Linear rheology: Maxwell model
  Tsutomu Indei, [Educational materials]

  
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• Molecular Study of Associating Polymer Rheology
  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
  2007 - 2009
  INDEI Tsutomu
  Rheology of associating polymer systems was theoretically studied. (1) The influence of low-molecular-weight surfactants : It was shown that the peak height appeared in the zero-shear viscosity and the relaxation time strongly depends on the synergism in the mixed micelle formation. (2) Effect of the number of associative groups per chain : It was shown that if the average number of associative groups per chain in bound state is large, viscoelastic relaxation behavior is well described in terms of the Rouse model. (3) Effect of the junction structure : Due to the cooperativity effect of the association/dissociation processes, the longest relaxation regime was shown to deviate from the Maxwell behavior depending on the length of the junction zone.
  Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Principal investigator, 19740259