Suteewong, Teeraporn

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Suteewong, Teeraporn
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teeraporn.su@kmitl.ac.th

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    A concise review on design and control of structured natural rubber latex particles as engineering nanocomposites
    (2021-10-05)
    Wichaita, Waraporn
    ;
    Promlok, Duangkamol
    ;
    Sudjaipraparat, Narissara
    ;
    Sripraphot, Supang
    ;
    Suteewong, Teeraporn
    In this article, we review the modification of natural rubber (NR) latex into the engineered particles for make use of them in functional nanocomposites. The review focuses on tuning nano-/microstructure and/or composition of NR latex particles by means of surface chemical functionalization, structural modification and incorporation of inorganic nanoparticles (NPs). Due to their polydispersity in size and non-spherical shape with complicated indigenous stabilizers, i.e., proteins and lipids, we first describe the fundamental and common methods for the modification of synthetic polymer latex which become a practical guideline for engineering of NR particles to a variety of designs. Subsequently, the examples of successfully modified NR latex and the involved parameters in the preparation are discussed. The different nature and properties of the modified NR latex compared to the synthetic latex are then depicted. Finally, specific examples of these systems used in a range of applications including nanofillers, controlled releasing materials, textiles, electronics and coatings are demonstrated. The research on modification of NR latex particles would be beneficial to the field of materials science and engineering for the valorization of naturally abundant colloidal polymer to the advanced functional materials in the broader utilization/commercialization in the future.
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    PMMA particles coated with chitosan-silver nanoparticles as a dual antibacterial modifier for natural rubber latex films
    (2019-02-01)
    Suteewong, Teeraporn
    ;
    Wongpreecha, Jitrada
    ;
    Polpanich, Duangporn
    ;
    Jangpatarapongsa, Kulachart
    ;
    Kaewsaneha, Chariya
    The antibacterial activity in sulphur prevulcanized natural rubber (SPNR) latex film was effectively improved by deposition of poly(methyl methacrylate) (PMMA) particles encircled with chitosan-coated silver nanoparticles (AgNPs-CS). With the focus on a green process, CS was selected as a safe reducing and stabilizing agent for the one-step synthesis of AgNPs-CS (38 nm, +40.4 mV) in an autoclave. The adsorption of small-sized AgNPs-CS directly onto rubber film did not provide an inhibitory effect on S. aureus. It also had a low antibacterial effect on E. coli. This is because of the particles becoming completely/partially submerged into the soft rubber matrix upon drying. Hence, the AgNPs-CS were fabricated as a shell surrounding a rigid PMMA core (496 nm, -30.9 mV). This was done using a heterocoagulation technique prior to coating on SPNR film. The presence of PMMA/AgNPs-CS on the surface of SPNR film effectively increased the surface roughness from ca. 44 to 150 nm. This substantially promoted the antibacterial activity against E. coli and S. aureus by way of contact killing and repelling mechanisms. The cytotoxicity on L-929 fibroblasts was also suppressed. This study would be, therefore, applicable to the development of antibacterial SPNR film with high surface roughness, low cytotoxicity. It could also be applied for other soft substrates.
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    Amino acid as a biodegradation accelerator of mesoporous silica nanoparticles
    (2019-07-01)
    Ratirotjanakul, Waranya
    ;
    Suteewong, Teeraporn
    ;
    Polpanich, Duangporn
    ;
    Tangboriboonrat, Pramuan
    In order to avoid cumulative toxicity of the remained mesoporous silica nanoparticles (MSNs) in biological systems, three amino acids (aâs), i.e., glycine (Gly), aspartic acid (Asp) and cysteine (Cys), were incorporated into MSNs for accelerating their biodegradation. Aâ was conjugated with 3-isocyanatopropyl triethoxysilane (ICPTES) before reacting with tetraethyl orthosilicate to form aâ-MSNs via the sol-gel process based co-condensation. FTIR spectra confirmed the urea bond formation in aâ-ICPTES, whereas silicon resonances of T<sup>2</sup> and T<sup>3</sup> in <sup>29</sup>Si NMR spectrum indicated the incorporation of aâ in MSNs. Spherical bare-MSNs (112 nm) were obtained while the rod-like particles were formed in the case of Gly-MSNs (73 nm in length), Asp-MSNs (90 nm in length), and Cys-MSNs (163 nm in length). The trend of %Si dissolution rate analyzed from microwave plasma-atomic emission spectrometer (MP-AES) of aâ-MSNs in phosphate buffer saline (PBS)/trypsin enzyme (pH 7.4) was 3–5 times higher than in PBS (pH 7.4) and 7–8 times higher than in acetate buffer (pH 5.2), respectively. The Asp-MSNs having two carboxylic groups showed the highest degradability, followed by Cys-MSNs, Gly-MSNs, and bare-MSNs in all three media. By capability of aâ as a dissolution promoter, the aâ-MSNs would be an effective and alternative material used as drug carrier in biomedical applications.
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    Parameters Governing Void Formation and Expansion of Hollow Natural Rubber Latex Particles for Their Use as Bio-based Nanocapsules
    (2025-02-01)
    Promlok, Duangkamol
    ;
    Suteewong, Teeraporn
    ;
    Polpanich, Duangporn
    ;
    Tangboriboonrat, Pramuan
    This work reports the hollow latex (HL) particles developed from natural rubber latex particles (NRPs), known for their broad size distribution and non-spherical shape. HL-NRPs, prepared via the seeded emulsion polymerization in one pot, are studied as potential bio-based nanocapsules for the first time. Effects of types of crosslinking agents and swelling agents, the addition of sodium dodecyl sulfate (SDS), and monomer compositions on the void formation and expansion are systematically investigated. The combined effects of phase separation between NR core swelled with divinyl benzene (DVB) and hydrophilic poly(methyl methacrylate/acrylic acid) P(MMA/AA) shell, the entanglement of rubber chains copolymerized with MMA/DVB/AA monomers, and the osmosis from external aqueous medium promoted the void formation. While crosslinking agents affected the void formation and shell strength, SDS and type of monomers governed colloidal stability and polymerization loci as well as morphology, respectively. The ability of HL-NRPs as nanocapsules is explored by encapsulating fluorescent dyes, i.e., hydrophilic fluorescein isothiocyanate (FITC) and lipophilic Nile red (NiR), as model cargo. From the dye release test after 24 h, the cumulative concentrations of FITC in methanol and of NiR in tetrahydrofuran are 0.17 and 0.11 µg mL<sup>−1</sup>, respectively. The results suggested that FITC is released from HL-NRPs easier than NiR possibly due to the different encapsulation location.
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    Fabrication of hollow magnetic polyaniline particles via in-situ polymerization in one-pot for UV–Vis-NIR and EMI applications
    (2024-01-01)
    Promlok, Duangkamol
    ;
    Wichaita, Waraporn
    ;
    Phongtamrug, Suttinun
    ;
    Kaewsaneha, Chariya
    ;
    Sreearunothai, Paiboon
    The concern on the adverse impacts of electromagnetic (EM) pollution has continuously increased. Instead of using heavy metal sheet, this work aims to develop magnetic polymeric particles, that can easily be incorporated in coatings, for EM/ultraviolet-visible-near infrared (UV–Vis-NIR) shielding. By carefully design structure and key components, hollow magnetic (HoM) polyaniline (PANI) particles possessing a void encircled with magnetic nanoparticles dispersed in PANI semi-conductive shell were fabricated via the oxidative polymerization in emulsion system. By using ethyl benzene as a soft template and different surfactive dopants, i.e., sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and poly(sodium 4-styrenesulfonate) (PSS), the HoM-PANI particles (0.5–2 μm) with well-defined hollow structure, high magnetic loading (17–21%wt), and superparamagnetic properties were obtained. The particle size distribution, and magnetic loading were slightly affected by the reaction temperature, whereas molecular weight (M<inf>w</inf>) of the localized dopant considerably influenced on the levels of interparticle connectivity, and hence, the conductivity could be tailored. The water dispersible HoM-PANI particles could form opaque coating, and free-standing film. PSS with M<inf>w</inf> of 70 K and 1 M yielded the larger HoM-PANI particles and more opaque films than small dopant molecules. Void size was the determining effect on excellent opacity of the coating containing HoM-PANI dispersed in poly(vinyl alcohol) matrix against UV–Vis-NIR, and EM radiation. The ability to tune their optical properties, and electrical conductivity accomplished by designing the particle nanostructure, and doping/de-doping by localized dopants enables them the promising candidates for functional paint, and film for irradiation protection.
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    PMMA-N,N,N-trimethyl chitosan nanoparticles for fabrication of antibacterial natural rubber latex gloves
    (2014-08-30)
    Arpornwichanop, Thanida
    ;
    Polpanich, Duangporn
    ;
    Thiramanas, Raweewan
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    This paper presents one-pot synthesis of N,N,N-trimethyl chitosan (TMC) stabilized poly(methyl methacrylate) (PMMA) latex particles via the miniemulsion polymerization technique. From <sup>1</sup>H NMR, synthesized TMC contains 52% degree of quaternization. Compared to native biopolymer chitosan, TMC possesses permanently positive charges as well as provides greater antibacterial activity. Combining properties of PMMA and TMC, PMMA-TMC latex nanoparticles hydrodynamic size.© 2014 Elsevier Ltd. All rights reserved.
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    One-pot, large-scale green synthesis of silver nanoparticles-chitosan with enhanced antibacterial activity and low cytotoxicity
    (2018-11-01)
    Wongpreecha, Jitrada
    ;
    Polpanich, Duangporn
    ;
    Suteewong, Teeraporn
    ;
    Kaewsaneha, Chariya
    ;
    Tangboriboonrat, Pramuan
    Silver nanoparticles stabilized with chitosan (AgNPs-CS) were synthesized based on the one-pot green process in an autoclave, in which CS acts as reducing agent as well as stabilizer. Effects related to temperature and pressure input on particle formation were systematically investigated. Mechanism taking place during particle nucleation and growth was proposed. The data from UV–vis absorption, X-ray diffraction pattern and morphology confirmed the formation of AgNPs-CS with face-centered cubic (fcc) structure. The synthesized AgNPs-CS showed the effective antibacterial activity against both E. coli and S. aureus. The minimum bactericidal concentration values of 39.1 and 312.5 μg/ml for E. coli and S. aureus, respectively, did not show cytotoxicity to L-929 fibroblast. Moreover, the covering of CS on the surface of AgNPs-CS was proven to reduce the cytotoxicity when compared with commercial citrate-stabilized AgNPs. Considering simple and mild process, this synthesis approach would be helpful for development of benign AgNPs-based antibacterial agent.
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    Hollow natural rubber latex particles as bio-based alternative white pigment for coating applications
    (2022-11-15)
    Promlok, Duangkamol
    ;
    Sonongbua, Kritayakorn
    ;
    Wilepsuwan, Mutita
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    Due to the broad particle size distribution as well as non-spherical shape of natural rubber (NR) latex particles, the non-collapse hollow NR latex particles (HL-NRPs) with well-defined void structure were developed aiming to use as an eco-friendly white pigment/additive for coatings. These hybrid HL-NRPs were prepared via the seeded emulsion polymerization of methyl methacrylate/divinylbenzene/acrylic acid (MMA/DVB/AA) monomers on NR core particles in one-pot. Using cumene hydroperoxide (CHP)/tetraethylene pentamine (TEPA) as a redox initiator, the copolymerization occurred at the particle/water interface. Without seed removal, a single void inside NRP was in situ formed by the phase separation process. Hydrophobic and elastic NR became the inner wall which strengthened the HL particles. Whereas its indigenous stabilizers, i.e., proteins-lipids, allowed the osmosis from the aqueous medium to further expand the void. The proposed mechanism was illustrated using oleic acid (OA) as a model fatty acid for non-rubber substances. Since the multiple light scattering inside the hollow structure could enhance their refractive index, the optical performance of HL-NRPs as a low-density opacifying agent in poly(vinyl alcohol) matrix, was examined using UV-Vis spectroscopy. Results showed that the HL-NRPs-based films exhibited high blocking ability over UV and visible regions. Moreover, the HL-NRPs coated with chitosan (CS) enabled these nanocomposites to adsorb the formaldehyde vapor. For sustainable development, HL-NRPs/CS could potentially be a green alternative white pigment/additive for coatings.
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    Green synthesis of AgNPs coated mesoporous silica nanoparticles using tyrosine as reducing/stabilising agent
    (2018-01-01)
    Ratirotjanakul, Waranya
    ;
    Sioloetwong, Tanapon
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    A novel, simple and environmental friendly approach to fabricate silver nanoparticles (AgNPs) on mesoporous silica nanoparticles (MSNs) using tyrosine (Tyr) as biological reducing agent was developed. The functionalization of Tyr with MSNs (Tyr-MSNs) (150 nm in length) by the sol-gel process was confirmed by the characteristic peaks of amino, carboxyl and silanol groups appeared in FTIR spectrum and the change of the zeta potential from 0 mV at pH 2 to -60 mV at pH 12. Then, AgNPs were formed on the surface of Tyr-MSNs (Tyr-MSN@AgNPs) via only reducibility from phenolic group of Tyr and catalytic activity from base at room temperature. TEM images and UV-Visible absorption band at 420 nm supported the obtained AgNPs (18 nm at pH 11) were tightly bound to Tyr-MSNs even after centrifugation at high speed. These Tyr-MSN@AgNPs would be potentially used as drug carrier in biomedical applications.
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    One-pot synthesis of organic-inorganic hybrid hollow latex particles via Pickering and seeded emulsion polymerizations
    (2015-04-01)
    Narongthong, Jirawat
    ;
    Nuasaen, Sukanya
    ;
    Suteewong, Teeraporn
    ;
    Tangboriboonrat, Pramuan
    Hybrid hollow latex (HL) particles possessing poly(styrene-co-acrylic acid) (P(St/AA)) as the inner shell, poly(divinyl benzene) (PDVB) as the outer shell, and silica nanoparticles (SiNPs) as the stabilizer were conveniently prepared via the combined Pickering and seeded emulsion polymerizations. P(St/AA) particles (435 nm) were used as seeds, DVB as a swollen and crosslink monomer, 2,2′-azobis(2-methylpropionamidine) dihydrochloride as initiator, and SiNPs as Pickering stabilizer. Without core removal, solvent evaporation, and surface modification steps, the spherical, monodisperse, and non-collapsed HL-SiNPs particles (722 nm) with double shell polymer layer and a large void cavity (400 nm) were obtained. The presence of large cavity and double shell may enable these hybrid HL-SiNPs particles to be used as lightweight filler and/or white pigment in coatings.