The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Tsuneo Urisu - One of the best experts on this subject based on the ideXlab platform.
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Deposition of 10-Undecenoic Acid self-assembled layers on H–Si(1 1 1) surfaces studied with AFM and FT-IR
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
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deposition of 10 Undecenoic Acid self assembled layers on h si 1 1 1 surfaces studied with afm and ft ir
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
Dongping Zhao - One of the best experts on this subject based on the ideXlab platform.
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Polyesters derived from bio-based eugenol and 10-Undecenoic Acid: synthesis, characterization, and structure–property relationships
RSC Advances, 2015Co-Authors: Dongping ZhaoAbstract:Renewable monomers derived from eugenol and 10-Undecenoic Acid were synthesized via thiol-ene click and nucleophilic substitution reactions. With these monomers in hand, a series of thermoplastic polyesters with tunable thermo-mechanical properties were prepared via two-step melt polycondensation. The prepared polyesters exhibit weight-average molecular weights in the range of 21 000–48 000 g mol−1, together with polydispersity values between 1.8 and 2.1. Experiments involving thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were carried out in order to study the thermal and mechanical properties of the polymers. All prepared polyester species prove to be thermally stable at temperatures up to 300 °C. Furthermore, the aromatic and semi-aromatic polyesters exhibit fully amorphous behaviours with glass transition temperatures (Tgs) ranging between −34.13 and 6.97 °C. Herein, the density of the rigid aromatic rings along the main chains of the polyester has a distinct influence on the Tg values. Furthermore, the fully aliphatic polyesters prove to be semi-crystalline with inconspicuous Tg. The incorporation of aromatic eugenol into the polyester chains and the density of the benzene rings were also found to result in a significant improvement in the mechanical properties, including Young's modulus and elongation at break in the range of 11.6 to 44.2 MPa and 33.6–106.7%, respectively. The relatively high tan δ and the low storage modulus indicate that eugenol-based polyesters feature superior viscosity properties and may therefore find future applicability in a variety of high-tech materials.
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polyesters derived from bio based eugenol and 10 Undecenoic Acid synthesis characterization and structure property relationships
RSC Advances, 2015Co-Authors: Dongping ZhaoAbstract:Renewable monomers derived from eugenol and 10-Undecenoic Acid were synthesized via thiol-ene click and nucleophilic substitution reactions. With these monomers in hand, a series of thermoplastic polyesters with tunable thermo-mechanical properties were prepared via two-step melt polycondensation. The prepared polyesters exhibit weight-average molecular weights in the range of 21 000–48 000 g mol−1, together with polydispersity values between 1.8 and 2.1. Experiments involving thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) were carried out in order to study the thermal and mechanical properties of the polymers. All prepared polyester species prove to be thermally stable at temperatures up to 300 °C. Furthermore, the aromatic and semi-aromatic polyesters exhibit fully amorphous behaviours with glass transition temperatures (Tgs) ranging between −34.13 and 6.97 °C. Herein, the density of the rigid aromatic rings along the main chains of the polyester has a distinct influence on the Tg values. Furthermore, the fully aliphatic polyesters prove to be semi-crystalline with inconspicuous Tg. The incorporation of aromatic eugenol into the polyester chains and the density of the benzene rings were also found to result in a significant improvement in the mechanical properties, including Young's modulus and elongation at break in the range of 11.6 to 44.2 MPa and 33.6–106.7%, respectively. The relatively high tan δ and the low storage modulus indicate that eugenol-based polyesters feature superior viscosity properties and may therefore find future applicability in a variety of high-tech materials.
Ryugo Tero - One of the best experts on this subject based on the ideXlab platform.
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Deposition of 10-Undecenoic Acid self-assembled layers on H–Si(1 1 1) surfaces studied with AFM and FT-IR
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
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deposition of 10 Undecenoic Acid self assembled layers on h si 1 1 1 surfaces studied with afm and ft ir
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
Venkataramanan Mahalingam - One of the best experts on this subject based on the ideXlab platform.
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Methylene Blue-Loaded Upconverting Hydrogel Nanocomposite: Potential Material for Near-Infrared Light-Triggered Photodynamic Therapy Application.
ACS omega, 2019Co-Authors: Brahmaiah Meesaragandla, Debashrita Sarkar, Venkataramanan MahalingamAbstract:The property of upconverting nanoparticles to convert the low-energy near-infrared (NIR) light into high-energy visible light has made them a potential candidate for various biomedical applications including photodynamic therapy (PDT). In this work, we show how a surface functionalization approach on the nanoparticle can be used to develop a nanocomposite hydrogel which can be of potential use for the PDT application. The upconverting hydrogel nanocomposite was synthesized by reacting 10-Undecenoic Acid-capped Yb3+/Er3+-doped NaYF4 nanoparticles with the thermosensitive N-isopropylacrylamide monomer. The formation of hydrogel was completed within 15 min and hydrogel nanocomposites showed strong enhancement in the visible light emission compared to the emission obtained from 10-Undecenoic Acid-capped Yb3+/Er3+-doped NaYF4 nanoparticles via the upconversion process (under 980 nm laser excitation). The upconverting hydrogel nanocomposites displayed high swelling behavior in water because of their porous natu...
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Methylene Blue-Loaded Upconverting Hydrogel Nanocomposite: Potential Material for Near-Infrared Light-Triggered Photodynamic Therapy Application
2019Co-Authors: Brahmaiah Meesaragandla, Debashrita Sarkar, Venkataramanan MahalingamAbstract:The property of upconverting nanoparticles to convert the low-energy near-infrared (NIR) light into high-energy visible light has made them a potential candidate for various biomedical applications including photodynamic therapy (PDT). In this work, we show how a surface functionalization approach on the nanoparticle can be used to develop a nanocomposite hydrogel which can be of potential use for the PDT application. The upconverting hydrogel nanocomposite was synthesized by reacting 10-Undecenoic Acid-capped Yb3+/Er3+-doped NaYF4 nanoparticles with the thermosensitive N-isopropylacrylamide monomer. The formation of hydrogel was completed within 15 min and hydrogel nanocomposites showed strong enhancement in the visible light emission compared to the emission obtained from 10-Undecenoic Acid-capped Yb3+/Er3+-doped NaYF4 nanoparticles via the upconversion process (under 980 nm laser excitation). The upconverting hydrogel nanocomposites displayed high swelling behavior in water because of their porous nature. The porous structure ensured a higher loading of methylene blue dye (∼78% in 1 h) into the upconverting hydrogel, which was achieved via the swelling diffusion phenomenon. Upon excitation with the NIR light, the visible light emitted from the hydrogel activated the photosensitizer methylene blue which generated reactive oxygen species. Our results were able to show that the methylene blue-loaded composite hydrogel can be a potential platform for the future of NIR-triggered PDT in skin cancer treatment
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Synthesis of Upconverting Hydrogel Nanocomposites Using Thiol‐Ene Click Chemistry: Template for the Formation of Dendrimer‐Like Gold Nanoparticle Assemblies
Chemistry: A European Journal, 2015Co-Authors: Brahmaiah Meesaragandla, Venkataramanan MahalingamAbstract:The synthesis of upconverting hydrogel nanocomposites by base-catalyzed thiol-ene click reaction between 10-Undecenoic Acid capped Yb(3+)/Er(3+)-doped NaYF4 nanoparticles and pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) as tetrathiol monomer is reported. This synthetic strategy for nanocomposite gels is quite different from works where usually the preformed gels are mixed with the nanoparticles. Developing nanocomposites by surface modification of capping ligands would allow tuning and controlling of the separation of the nanoparticles inside the gel network. The hydrogel nanocomposites prepared by thiol-ene click reaction show strong enhancement in luminescence intensity compared to 10-Undecenoic Acid-capped Yb(3+)/Er(3+)-doped NaYF4 nanoparticles through the upconversion process (under 980 nm laser excitation). The hydrogel nanocomposites display strong swelling characteristics in water resulting in porous structures. Interestingly, the resulting nanocomposite gels act as templates for the synthesis of dendrimer-like Au nanostructures when HAuCl4 is reduced in the presence of the nanocomposite gels.
T. Nagasawa - One of the best experts on this subject based on the ideXlab platform.
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Deposition of 10-Undecenoic Acid self-assembled layers on H–Si(1 1 1) surfaces studied with AFM and FT-IR
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
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deposition of 10 Undecenoic Acid self assembled layers on h si 1 1 1 surfaces studied with afm and ft ir
Applied Surface Science, 2004Co-Authors: Ryugo Tero, T. Nagasawa, T. Nagata, Tsuneo UrisuAbstract:Self-assembling layers of 10-Undecenoic Acid (UA) were deposited on H-terminated Si(1 1 1) surfaces and characterized with atomic force microscopy (AFM) and Fourier-transform infrared (FT-IR) spectroscopy measurements for the first time. The unique island structures are deposited by layer-by-layer growth mechanism. The IR spectra suggest that the multilayers grown over the first monolayer are deposited by weak intermolecular interactions such as Van der Waals force and hydrogen bonding.
