Article
Biochemistry & Molecular Biology
Guoling Zhang, Guogang Yang, Shian Li, Qiuwan Shen, Hao Wang, Zheng Li, Yang Zhou, Weiqiang Ye
Summary: The study found that as the water content increases in Nafion 117, the size of water clusters increases, connecting to form continuous channels for diffusion of water molecules and hydronium ions. Additionally, the diffusion of water molecules and hydronium ions is enhanced by the increase in temperature and hydration level. The diffusion coefficient of water molecules is always larger than that of hydronium ions, but the ratio decreases with increasing water content.
Article
Chemistry, Physical
Francois A. Lavergne, Peter Sollich, Veronique Trappe
Summary: This study demonstrates that the slow viscoelastic response of a foam can be described by a power-law fluid with a terminal relaxation. The reversible power-law contribution accounts for the observed non-Maxwellian features in various tests, indicating a delayed elastic response. The power-law spectrum originates from a combination of superdiffusive bubble dynamics and stress diffusion.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Polymer Science
Paulo Santos, Abilio P. Silva, Paulo N. B. Reis
Summary: Two different viscosity epoxy resins were enhanced with carbon nanofibers (CNFs) up to 1 wt.%. The addition of 0.5 wt.% and 0.75 wt.% CNFs to Ebalta and Sicomin epoxies, respectively, resulted in higher relative bending stress and elastic modulus. The lower viscosity resin, Ebalta, showed the highest bending stress and modulus due to its interfacial strength and dispersibility of the fillers. CNFs also improved creep behavior and stress relaxation at different stress levels, acting as a network that immobilized the polymer chains. Long-term experiments successfully applied the Kohlrausch-Williams-Watts (KWW) and Findley models to accurately predict stress relaxation and creep behavior.
Article
Engineering, Chemical
Ricardo Cruz, Luis Correia, Susana Cabral-Fonseca, Jose Sena-Cruz
Summary: This study found that the preparation method of the adhesive has a significant impact on its tensile properties, particularly on the viscoelastic response and creep deformation. Under hygrothermal conditions, the adhesive exhibits linear creep behavior and can be parameterized using the Burgers equation.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2021)
Article
Energy & Fuels
Da-Wei Zhou, Guang-Qing Zhang, Zhong-Wei Huang, Shi-Yuan Li, Zong-Yang Fan
Summary: This study investigates the influence of SC-CO2 on the short-term viscoelastic properties of different types of shales. The results show that SC-CO2 treatment decreases the elastic moduli and increases the creep deformation of the shales. SEM analysis confirms the physicochemical mechanisms responsible for the observed damage and enhancement.
Article
Nanoscience & Nanotechnology
Shuxia Ouyang, Guangyu Yang, Cheng Chen, Tong Bai, He Qin, Chunhui Wang, Lei Zhang, Wanqi Jie
Summary: The addition of Zn in Mg-rare earth alloys has different effects on the microstructures and creep properties. At low temperatures, Mg-15Gd alloy exhibits better creep resistance, while at high temperatures, Mg-15Gd-1Zn alloy has better creep resistance.
SCRIPTA MATERIALIA
(2022)
Article
Polymer Science
Ricardo Diaz-Calleja, Damian Ginestar, Vicente Compan Moreno, Pedro Llovera-Segovia, Clara Burgos-Simon, Juan Carlos Cortes, Alfredo Quijano, Joaquin Diaz-Boils
Summary: Electroelastic materials like 3M VHB 4910 are being studied as actuators or generators due to their ability to deform under an electric field. Viscoelastic models have been proposed to explain the dissipative behavior of these materials, and the introduction of fractional derivatives has been shown to provide a better description of material behavior. Additionally, the adoption of the Mooney-Rivlin equation and the modification of the free energy density model can predict bifurcation phenomena in equibiaxial dead loads.
Article
Engineering, Biomedical
Gabrielle L. Clark-Patterson, Lily M. Buchanan, Benard O. Ogola, Maria Florian-Rodriguez, Sarah H. Lindsey, Raffaella De Vita, Kristin S. Miller
Summary: Smooth muscle cells contribute to the viscoelastic response of various soft tissues, including the vagina. This study aimed to evaluate the contribution of smooth muscle to vaginal creep under multiaxial loading using extension-inflation tests. The results showed that smooth muscle contraction increased vaginal creep behavior compared to the relaxed state, but increased pressure decreased the active creep response. These findings highlight the importance of smooth muscle in the biomechanical function of tubular soft tissues.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Fan Cui, Jikun Wang, Alan Zehnder, Chung-Yuen Hui
Summary: The experimental study investigated the effect of drying on the viscoelastic and tensile behavior of a dual cross-linked PVA hydrogel, revealing that drying leads to increased stiffness and incomplete recovery upon unloading. Additionally, the mechanical properties of the gel can be described using a previously developed constitutive model, with model parameters strongly dependent on hydration level.
MECHANICS OF MATERIALS
(2021)
Article
Construction & Building Technology
Tao Bai, Xuan Huang, Xiaotao Zheng, Hao Wang, Yingxiao Cheng, Bingyan Cui, Fang Xu, Bowen Mao, Yuanyuan Li
Summary: This study conducted dynamic modulus, dynamic resilience modulus, and creep compliance tests to characterize and quantify the effects of viscoelastic parameters of asphalt mixtures on the mechanical response of pavement structures. The results showed that stress magnitude significantly affected the evolution of master curves for parametric conversions from creep compliance and all mechanical responses increased with temperature. The study also demonstrated the importance of interlayer bonding for minimizing compressive/shear stresses and strains in pavement structures to mitigate failure, debonding, delamination, etc. Lastly, the use of modified asphalt mixtures was found critical to mitigate high compressive and shear strains under heavy traffic loading in high temperature climatic conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Computer Science, Interdisciplinary Applications
Jinlai Zhou, Yang Song, Xue Shi, Chunqiu Zhang
Summary: The study investigated the nonlinear creep mechanical behavior of PDL using coupled Ogden hyperelastic and creep models. Results indicated that creep strain and compliance curves of PDL showed different growth trends over time. The experimental data demonstrated high consistency with the hyper-viscoelastic constitutive model, supporting the framework for future studies on other nonlinear viscoelastic biomaterials.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2021)
Article
Materials Science, Composites
Harun Sepetcioglu
Summary: The study investigated the creep behavior of HDPE-based nanocomposites reinforced with different weight percentages of nanoclay under various stress levels. It was found that the creep resistance and absorbed energy of the nanocomposites varied with the nanoclay reinforcement ratio, and the four-element Burger model provided a better fit to the creep curves compared to Findley's power law model.
POLYMER COMPOSITES
(2021)
Article
Metallurgy & Metallurgical Engineering
Shuxia Ouyang, Guangyu Yang, He Qin, Chunhui Wang, Shifeng Luo, Wanqi Jie
Summary: This study investigates the effect of different heat treatments on the mechanical behaviors of Mg-Gd alloys at high temperatures. The results show that the T6 alloy exhibits the highest tensile properties from room temperature to 300 degrees C, while the T4 alloy possesses the best creep properties above 260 degrees C.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Multidisciplinary
Stewart F. Parker, Shrey Shah
Summary: In this study, the hydration changes of Nafion were characterized as a function of water content using a combination of inelastic neutron scattering (INS) and infrared spectroscopies, and compared to a series of trifluoromethanesulfonic acid hydrates with defined stoichiometry.
Article
Engineering, Multidisciplinary
Q. Dezulier, A. Clement, P. Davies, M. Arhant, B. Flageul, F. Jacquemin
Summary: This study investigates the influence of long-term immersion on the hygro-elastic and hygro-viscoelastic behavior of epoxy resin samples through experimental tests and numerical simulations. A model is proposed to simulate the hygro-viscoelastic behavior of the material, and good agreement between experimental and numerical results is observed.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Physical
Farshid Salimijazi, Jaehwan Kim, Alexa M. Schmitz, Richard Grenville, Andrew Bocarsly, Buz Barstow
Article
Chemistry, Physical
Jessica J. Frick, Guangming Cheng, Satya Kushwaha, Nan Yao, Sigurd Wagner, Andrew B. Bocarsly, Robert J. Cava
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Sungyeon Heo, Kwangdong Roh, Fengyu Zhang, Steven E. Tignor, Andrew B. Bocarsly, Antoine Kahn, Barry P. Rand
Summary: Electrochemical n-doping of halide perovskites is challenging due to limited electrochemical stability. In this study, we report the successful electrochemical n-doping of CsPbBr3 nanocrystal films within stable potential windows. The nanocrystal films show enhanced n-doping properties compared to bulk films, and the n-doped films exhibit Fermi level shifts and increased conductivity and photoluminescence intensity.
ACS ENERGY LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Kailyn Y. Cohen, Rebecca Evans, Stephanie Dulovic, Andrew B. Bocarsly
Summary: The Bocarsly Research Group focuses on developing new electrochemical and photochemical processes for the conversion of CO2 into organic compounds. Their studies on proton-coupled charge transfer mechanisms have shown promising results in producing C1 and carbon-carbon bonded products. The research has significant implications for the synthesis and fuel alternatives to fossil fuels.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Steve P. Cronin, Stephanie Dulovic, Josef A. Lawrence, Kai A. Filsinger, Alma Paola Hernandez-Gonzalez, Rebecca Evans, Joseph W. Stiles, Jalah Morris, Istvan Pelczer, Andrew B. Bocarsly
Summary: The modification of a Cr-Ga oxide electrocatalyst through the introduction of nickel generates a high faradaic efficiency in producing 1-butanol. At certain potentials, 3-hydroxybutanal becomes the primary product. Mechanistic studies show that formate is the initial CO2 reduction product and acetaldehyde is the key intermediate.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Kailyn Y. Cohen, Rebecca Evans, Andrew B. Bocarsly
Summary: This study investigates the relationship between the catalytic activity of [Mn(bpy)(CO)(3)Br] and the steric and electronic properties of the aromatic diimine ligand. It is found that as the p-system in the ligand expands, the propensity of the complexes to dimerize photochemically increases. Additionally, the second reduction event becomes more thermodynamically favorable as the p-system expands, approaching the potential of the first reduction event.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Kailyn Y. Cohen, Delaan G. Nedd, Rebecca Evans, Andrew B. Bocarsly
Summary: Without a photosensitizer, [Mn(bpy)(CO)(3)(CN)] (MnCN) can produce [Mn(bpy)(CO)(3)](-) via photochemical reaction, which is the active species for CO2 reduction. While dissociation of the axial X-ligand upon irradiation of fac-[M(N-N)(CO)(3)X] complexes (M = Mn or Re; N-N = bipyridine (bpy) ligand; X = halogen or pseudohalogen) is well-documented, the axial cyanide ligand remains intact during the irradiation of either [Mn(bpy)(CO)(3)(CN)] or [Mn(mesbpy)(CO)(3)(CN)], MnCN(mesbpy). The formation of [Mn(bpy)(CO)(2)(MeCN)(CN)] (s-MnCN) as the primary product during the irradiation of MnCN is confirmed by infrared and UV-vis spectroscopy. An in-depth analysis of the photochemical mechanism for the formation of [Mn(bpy)(CO)(3)](-) from MnCN is presented. MnCN(mesbpy) is too sterically hindered to undergo the same photochemical mechanism as MnCN, but it shows electrocatalytic activity for CO2 reduction to CO, highlighting an interesting distinction between photochemical and electrochemical charge transfer.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Kailyn Y. Cohen, Adam Reinhold, Rebecca Evans, Tia S. Lee, Hsin-Ya Kuo, Delaan G. Nedd, Gregory D. Scholes, Andrew B. Bocarsly
Summary: The mechanism of the photochemical reduction of CO2 to CO by [Mn(bpy)(CO)(3)](2) has been investigated. It was found that the reaction occurs at the Mn axial ligation site and leads to the formation of a metal-metal bonded dimeric species. In photolysis experiments, it was observed that the radical species [Mn(bpy)(CO)(3•)] interacts with CO2. Therefore, this species may serve as a photochemical reagent for the conversion of CO2 to CO.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Brian M. Foster, Aubrey R. Paris, Jessica J. Frick, Daniel A. Blasini-Perez, Robert J. Cava, Andrew B. Bocarsly
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Inorganic & Nuclear
Hsin-Ya Kuo, Steven E. Tignor, Tia S. Lee, Danrui Ni, James Eujin Park, Gregory D. Scholes, Andrew B. Bocarsly
DALTON TRANSACTIONS
(2020)
Article
Chemistry, Inorganic & Nuclear
Steven E. Tignor, Travis W. Shaw, Andrew B. Bocarsly
DALTON TRANSACTIONS
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Danrui Ni, Hsin-Ya Kuo, Robert Cava, Andrew Bocarsly
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Hsin-Ya Kuo, Tia Lee, Steven Tignor, Gregory Scholes, Andrew Bocarsly
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Physical
Aubrey R. Paris, Andrew B. Bocarsly
FARADAY DISCUSSIONS
(2019)
Article
Chemistry, Inorganic & Nuclear
Hsin-Ya Kuo, Tia S. Lee, An T. Chu, Steven E. Tignor, Gregory D. Scholes, Andrew B. Bocarsly
DALTON TRANSACTIONS
(2019)