Nano-emulsification of oriental lacquer sap by ultrasonic wave propagation: Improvement of thin-film characteristics as a natural resin

Oh, Hyo-Jun; Hwang, Jun Ho; Park, Minju; Kim, Soo Jin; Lee, Jihoo; Lim, Ho Sun; Lee, Sang-Soo; Lim, Jung Ah; Lee, Eunji

doi:10.1016/j.ultsonch.2021.105545

Cited by 9 publications

(10 citation statements)

References 31 publications

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“…As the quantity of the additive agent increased, more wrinkles were formed on the surface, thereby increasing light scattering and significantly decreasing the transmittance. 41 Corresponding to these results, the LSS films were prepared at Y-ADDA at different concentrations (0.001, 0.01, 0.05, and 0.1 equiv) and showed haze values of 7.8, 8.1, 8.9, and 9.6%, respectively, when measured at a wavelength of 550 nm (Table 5 and Figure 6d). The LSS films with Y-ADDA showed the lowest haze values compared to those with Fmoc-Tyr(tBu)-OH and shellac, indicating that the surface of the film with Y-ADDA was the most transparent and smooth.…”

Section: ■ Introductionmentioning

confidence: 59%

“…In a previous study, it was confirmed that the drying time for LSS was considerably reduced by ultrasonic treatment due to the generation of a nano-emulsion droplet . Therefore, the LSS with 0.1 equiv of each photo-curable additive was ultrasonically treated (100 W, 42 kHz) for 30 min and applied to the substrate (Table S1).…”

Section: Resultsmentioning

confidence: 85%

“…9−11 In a previous study, it was confirmed that the drying time for LSS was considerably reduced by ultrasonic treatment due to the generation of a nano-emulsion droplet. 41 Therefore, the LSS with 0.1 equiv of each photo-curable additive was ultrasonically treated (100 W, 42 kHz) for 30 min and applied to the substrate (Table S1). For the LSS with Y-ADDA, the TD time was already greatly reduced simply by adding the photo-curing agent; therefore, the film drying time did not change significantly after ultrasonic treatment.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The transmittances of LSS films with Fmoc-Tyr(tBu)-OH, shellac, and Y-ADDA improved to 70.4, 74.1, and 74.2%, respectively (Table 5) as a result of the reduction in scattering due to the generation of smaller emulsion droplets. 41 Given these results, it is evident that the size of the LSS W/O emulsion droplets and the use of well-miscible additives should be considered to improve film transmittance. 41−43 As shown in Figure 7, the adhesion level of the LSS films was determined using a cross-cut test to assess the resistance of the films to separation from the substrates.…”

Section: ■ Introductionmentioning

confidence: 99%

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Photo-Curable Lacquer Sap Resin Based on Urushiol-Mimicking, Tyrosine-Containing Additive

et al. 2022

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Oriental lacquer sap is attracting considerable attention as a renewable and eco-friendly natural resin with high durability, heat resistance, insulation, insect repellency, and antiseptic and antibacterial properties. However, to ensure excellent coating performance, it is necessary to improve the drying/curing process of lacquer sap with a time-consuming drying time at high humidity [relative humidity (RH), 70−90%] and ambient temperature (20−30 °C). Drawing on an understanding of the polymerization mechanism of urushiol, the main component of the lacquer sap consisted of a water-in-oil (W/O) emulsion, and this study presents an eco-friendly additive that mimics the structure−function of urushiol composed of a polar catechol head group and a nonpolar hydrocarbon tail. A photo-curable lacquer sap was thus developed by adding a tyrosine amino acid-based lipid agent (denoted as Y-ADDA), which allows faster and more effective drying/curing at lower humidity while maintaining the nature-derived properties of lacquer sap. Y-ADDA easily coassembles with urushiol in the W/O emulsion droplets, thereby significantly accelerating the formation of a polymer network along with urushiol during water evaporation leading to fast drying/curing under ultraviolet (UV) light irradiation at low humidity (∼50% RH). The UV-cured lacquer sap resins showed higher performance in terms of film processing and physicochemical properties compared with that of the lacquer containing only tyrosine amino acids without aliphatic tail conjugation, N-(9fluorenylmethoxycarbonyl)-O-tert-butyl-L-tyrosine Fmoc-Tyr(tBu)-OH. Furthermore, the drying and curing times, film morphology, transmittance, hardness, and adhesion strength of the UV-cured lacquer were markedly superior compared to those of shellac, a general eco-friendly fast-drying primer. The study provides useful strategies and insights to promote the industrial application of lacquer sap resins by employing biocompatible nanoagents developed with an understanding of the curing mechanism of natural resins and from the viewpoint of green and sustainable chemistry perspective.

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Section: ■ Introductionmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 85%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photo-Curable Lacquer Sap Resin Based on Urushiol-Mimicking, Tyrosine-Containing Additive

et al. 2022

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“…In addition, it has been used for thousands of years in history in of the East Asia, especially in China [1][2][3] . It is still used now because of its durability, acid and alkali resistance and high ornamental performance after it cured [4][5][6] . The compositions of lacquer sap are urushiol (40%~80%), water (20%~30%), plant gum substance (~7%), polysaccharides (~5%), laccase (<1%), and other substance (<5%) [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Thermal Degradation of Raw Lacquer Enhanced by Formaldehyde Urea Prepolymer

Xiao

Cao

Zheng

et al. 2022

Preprint

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In this study, formaldehyde-urea prepolymer (FUP) were synthesized, which were used to modify the raw lacquer (RL), while the basic properties of the RL were tested. Thermal gravimetric analysis and scanning electron microscopy were used to analyze the degradative characteristics and the surface morphology of RL before and after modification. The result indicated that FUP can significantly improve the performance of RL. The drying time of the modifying RL is significantly shortened the gloss, the pencil hardness, and the impact performance are also significantly enhanced at the same time. TG analysis and thermal decomposition kinetics analysis illustrated that the thermal stability and the activation energy of LF2 were stronger than that of RL. In addition, scanning electron microscopy analysis illustrated that the surface smoothness of RL were also improved.

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Acoustic Levitation Synthesis of Ultrahigh‐Density Spherical Nucleic Acid Architectures for Specific SERS Analysis

Ding,

Gao,

Wang

et al. 2024

Angewandte Chemie

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Controllably regulating the electrostatic bilayer of nanogold colloids is a significant premise for synthesizing spherical nucleic acid (SNA) and building ordered plasmonic architectures. We develop a facile acoustic levitation reactor to universally synthesize SNAs with an ultra‐high density of DNA strands. Results reveal a new mechanism of DNA grafting via acoustic wave that can reconfigure the ligands on colloidal surfaces. The acoustic levitation reactor enables substrate‐free three‐dimentional (3D) spatial assembly of SNAs with controllable interparticle nanogaps through regulating DNA lengths. This kind of architecture may overcome the plasmonic enhancement limits by blocking electron tunneling and breaking electrostatic shielding in dried aggregations. Finite element simulations support the architecture with 3D spatial plasmonic hotspot matrix, and its ultrahigh surface‐enhanced Raman scattering (SERS) capability is evidenced by in‐situ untargeted tracking of biomolecular events during photothermal stimulation (PTS)‐induced cell death process. For biomarker diagnosis, the conjugation of ATP aptamer onto SNAs enables in‐situ targeted tracking of ATP during PTS‐induced cell death process. Particularly, the CD71 receptor and integrin α3β1 protein on PL45 cell could be well distinguished by label‐free SERS fingerprints when using specific XQ‐2d and DML‐7 aptamers, respectively. Our current acoustic levitation reactor promises great potentials in biochemical synthesis and sensing in future.

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Nano-emulsification of oriental lacquer sap by ultrasonic wave propagation: Improvement of thin-film characteristics as a natural resin

Abstract: Graphical abstract

Cited by 9 publications

References 31 publications

Photo-Curable Lacquer Sap Resin Based on Urushiol-Mimicking, Tyrosine-Containing Additive

Photo-Curable Lacquer Sap Resin Based on Urushiol-Mimicking, Tyrosine-Containing Additive

Kinetics of Thermal Degradation of Raw Lacquer Enhanced by Formaldehyde Urea Prepolymer

Acoustic Levitation Synthesis of Ultrahigh‐Density Spherical Nucleic Acid Architectures for Specific SERS Analysis

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