1
|
Mirmohseni A, Rastgar M, Olad A. PANI-chitosan-TiO2
ternary nanocomposite and its effectiveness on antibacterial and antistatic behavior of epoxy coating. J Appl Polym Sci 2019. [DOI: 10.1002/app.47629] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Abdolreza Mirmohseni
- Department of Applied Chemistry, Faculty of Chemistry; University of Tabriz; Tabriz 51666-16471 Iran
| | - Mortaza Rastgar
- Department of Applied Chemistry, Faculty of Chemistry; University of Tabriz; Tabriz 51666-16471 Iran
| | - Ali Olad
- Department of Applied Chemistry, Faculty of Chemistry; University of Tabriz; Tabriz 51666-16471 Iran
| |
Collapse
|
2
|
Arunadevi R, Kavitha B, Rajarajan M, Suganthi A. Sonochemical synthesis and high-efficient solar-light-driven photocatalytic activity of novel cobalt and manganese codoped tungsten oxide nanoparticles. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.11.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
3
|
Chen F, Cao Q, Dong C, Shao B, Zhai W, Ma X, Wei B. Ultrasonic polymerization of CuO@PNIPAM and its temperature tuning glucose sensing behavior. ULTRASONICS SONOCHEMISTRY 2018; 49:190-195. [PMID: 30122470 DOI: 10.1016/j.ultsonch.2018.08.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/13/2018] [Accepted: 08/08/2018] [Indexed: 06/08/2023]
Abstract
The extraordinary high pressure and temperature produced during cavitation is crucial for ultrasonic sonochemistry. However, the cavitation effect is usually confined to a small zone nearby the ultrasonic horn, outside of which ultrasound produces much less effects on chemical reaction. In present work, in order to expand the range of effective zone and intensify the cavitation effect, N2 aeration was introduced to an ultrasonic polymerization process of CuO@PNIPAM in aqueous solution. By increasing the number of bubble nucleus gathered on the CuO surface and lowering the surface tension of the aqueous solution, the cavitation effect is intensified on the CuO surface within the whole reaction vessel, which benefits the covalently bonding between PNIPAM and CuO to a large degree and results in the formation of CuO@PNIPAM hybrid composite with excellent interfacial bonding. It is promising that the hybrid composite can be applied as temperature responsive glucose sensing platform with ON and OFF states due to the wettability change of PNIPAM versus temperature.
Collapse
Affiliation(s)
- Fang Chen
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, ShenZhen 518097, PR China; The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| | - Qi Cao
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| | - Chen Dong
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, ShenZhen 518097, PR China; The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| | - Bo Shao
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, ShenZhen 518097, PR China; The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| | - Wei Zhai
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China.
| | - Xiaoyan Ma
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, ShenZhen 518097, PR China; The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| | - Bingbo Wei
- The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, PR China
| |
Collapse
|
4
|
Barbosa JS, Neto DMA, Freire RM, Rocha JS, Fechine LMUD, Denardin JC, Valentini A, de Araújo TG, Mazzetto SE, Fechine PBA. Ultrafast sonochemistry-based approach to coat TiO 2 commercial particles for sunscreen formulation. ULTRASONICS SONOCHEMISTRY 2018; 48:340-348. [PMID: 30080559 DOI: 10.1016/j.ultsonch.2018.06.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 06/15/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
TiO2 is a common inorganic filter used in sunscreens due to its photoprotective effect on the skin against UV radiation. However, the use of this kind of material in cosmetics is limited by its inherent photocatalytic activity. It is known that coating on TiO2 surface can improve some features. Although, many of the methodologies used for this purpose are still laborious and time-consuming. Thus, this work reports a novel, easy, cheap and fast strategy to coat TiO2 particles by using a sonochemistry approach, aiming to decrease photocatalytic activity and to enhance colloidal stability. For this proposal, SiO2, Al2O3, ZrO2 and sodium polyacrylate (PAANa) were used to tune the surface of commercial TiO2 particles and they were applied in a sunscreen formulation. The samples were characterized by XRPD, FT-IR, DLS, EDS, SEM and TEM. The photocatalytic activity and UV-shielding ability were also evaluated. The sunscreen formulations were prepared and characterized by zeta potential, DLS, and Sun Protection Factor (SPF). FT-IR, EDS, and charge surface of the particles confirmed the success of the sonochemistry coating. Additionally, TiO2@Al2O3, TiO2@SiO2 and TiO2@PAANa show a lower photocatalytic activity than original TiO2 with similar UV-shielding ability. The sunscreens produced with the coated TiO2 have similar SPF to the one with commercial TiO2. Specifically, the sunscreen with TiO2@PAANa shows an increase in colloidal stability. Herein, the incorporation of the sonochemical-coated TiO2 particles in sunscreen formulations may produce sunscreens with better aesthetic appearance and a greater health security due to its lower free radicals production.
Collapse
Affiliation(s)
- J S Barbosa
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil
| | - D M A Neto
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil; Natural Science and Mathematics Institute, University for International Integration of the Afro-Brazilian Lusophony - UNILAB, Campus dos Palmares, Redenção, CE, Brazil
| | - R M Freire
- Department of Physics, Universidad de Santiago de Chile and CEDENNA, USACH, Av. Ecuador, 3493 Santiago, Chile.
| | - J S Rocha
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - L M U D Fechine
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil
| | - J C Denardin
- Department of Physics, Universidad de Santiago de Chile and CEDENNA, USACH, Av. Ecuador, 3493 Santiago, Chile; Departament of Physics, Federal University of Santa Maria, 97105-900 Santa Maria, RS, Brazil.
| | - A Valentini
- Laboratory of Adsorption and Catalysis (Langmuir) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - T G de Araújo
- Laboratory of Cosmetology, Department of Pharmacy, Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Fortaleza, CE, Brazil
| | - S E Mazzetto
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| | - P B A Fechine
- Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, CEP 60451-970 Fortaleza, CE, Brazil.
| |
Collapse
|
5
|
Mettu S, Ye Q, Zhou M, Dagastine R, Ashokkumar M. Ultrasonically synthesized organic liquid-filled chitosan microcapsules: part 2: characterization using AFM (atomic force microscopy) and combined AFM-confocal laser scanning fluorescence microscopy. SOFT MATTER 2018; 14:3192-3201. [PMID: 29651482 DOI: 10.1039/c8sm00065d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Atomic Force Microscopy (AFM) is used to measure the stiffness and Young's modulus of individual microcapsules that have a chitosan cross-linked shell encapsulating tetradecane. The oil filled microcapsules were prepared using a one pot synthesis via ultrasonic emulsification of tetradecane and crosslinking of the chitosan shell in aqueous solutions of acetic acid. The concentration of acetic acid in aqueous solutions of chitosan was varied from 0.2% to 25% v/v. The effect of acetic acid concentration and size of the individual microcapsules on the strength was probed. The deformations and forces required to rupture the microcapsules were also measured. Three dimensional deformations of microcapsules under large applied loads were obtained by the combination of Laser Scanning Confocal Microscopy (LSCM) with Atomic Force Microscopy (AFM). The stiffness, and hence the modulus, of the microcapsules was found to decrease with an increase in size with the average stiffness ranging from 82 to 111 mN m-1 and average Young's modulus ranging from 0.4 to 6.5 MPa. The forces required to rupture the microcapsules varied from 150 to 250 nN with deformations of the microcapsules up to 62 to 110% relative to their radius, respectively. Three dimensional images obtained using laser scanning confocal microscopy showed that the microcapsules retained their structure and shape after being subjected to large deformations and subsequent removal of the loads. Based on the above observations, the oil filled chitosan crosslinked microcapsules are an ideal choice for use in the food and pharmaceutical industries as they would be able to withstand the process conditions encountered.
Collapse
Affiliation(s)
- Srinivas Mettu
- School of Chemistry, The University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia.
| | | | | | | | | |
Collapse
|
6
|
Ye Q, Mettu S, Zhou M, Dagastine R, Ashokkumar M. Ultrasonically synthesized organic liquid-filled chitosan microcapsules: part 1: tuning physical & functional properties. SOFT MATTER 2018; 14:3202-3208. [PMID: 29651481 DOI: 10.1039/c8sm00064f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study reports the synthesis of tetradecane-filled chitosan microcapsules in acetic acid aqueous solutions using high intensity ultrasound at 20 kHz. The size, size distribution, and stability of microcapsules were tuned by varying the concentration of acetic acid from 0.2% to 25% v/v. After long-time storage at room temperature (more than 3 months), the microcapsules maintained their shell-core structure where the volume of the microcapsules at 0.2% acetic acid concentration increased by 8.3% due to leaking and coalescence. Microcapsules were consistently spherical and had a smooth shell surface, however, their shell thickness varied with acetic acid concentration. The relaxation behavior of individual microcapsules to an applied constant stress was measured by atomic force microscopy (AFM) to probe the shell strength and extent of crosslinking. The effect of acetic acid on the relative viscosity of chitosan aqueous solutions played a major role in microcapsule size control at low acid concentrations. With constant addition of acetic acid, amino groups in chitosan chains were acetylated partially under ultrasonic irradiation. This reduced the amphiphilicity of the shell material and therefore influenced the size, size distribution, stability and mechanical strength of the microcapsules. Apart from the acetylation effect, the counter-ion effect and the formation of covalent bond crosslinks also made contributions to the formation of stable chitosan microcapsules.
Collapse
Affiliation(s)
- Qianyu Ye
- School of Chemistry, The University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia.
| | | | | | | | | |
Collapse
|
7
|
Leong TSH, Martin GJO, Ashokkumar M. Ultrasonic encapsulation - A review. ULTRASONICS SONOCHEMISTRY 2017; 35:605-614. [PMID: 27053430 DOI: 10.1016/j.ultsonch.2016.03.017] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 03/12/2016] [Accepted: 03/18/2016] [Indexed: 05/23/2023]
Abstract
Encapsulation of materials in particles dispersed in water has many applications in nutritional foods, imaging, energy production and therapeutic/diagnostic medicine. Ultrasonic technology has been proven effective at creating encapsulating particles and droplets with specific physical and functional properties. Examples include highly stable emulsions, functional polymeric particles with environmental sensitivity, and microspheres for encapsulating drugs for targeted delivery. This article provides an overview of the primary mechanisms arising from ultrasonics responsible for the formation of these materials, highlighting examples that show promise particularly in the development of foods and bioproducts.
Collapse
Affiliation(s)
- Thomas S H Leong
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia; Department of Chemical & Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia; ARC Dairy Innovation Hub, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Gregory J O Martin
- Department of Chemical & Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia; ARC Dairy Innovation Hub, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Muthupandian Ashokkumar
- School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia; ARC Dairy Innovation Hub, University of Melbourne, Parkville, Victoria 3010, Australia.
| |
Collapse
|
8
|
Colombo E, Li W, Bhangu SK, Ashokkumar M. Chitosan microspheres as a template for TiO2and ZnO microparticles: studies on mechanism, functionalization and applications in photocatalysis and H2S removal. RSC Adv 2017. [DOI: 10.1039/c7ra01227f] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Highly efficient micron-sized photocatalysts with easy removability and recyclability features.
Collapse
Affiliation(s)
| | - Wu Li
- School of Chemistry
- University of Melbourne
- Australia
| | | | | |
Collapse
|
9
|
Bakar SA, Ribeiro C. Rapid and morphology controlled synthesis of anionic S-doped TiO2 photocatalysts for the visible-light-driven photodegradation of organic pollutants. RSC Adv 2016. [DOI: 10.1039/c6ra03819k] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In recent years, growing concerned has been raised to the global problem of the drainage of organic pollutants into water steams.
Collapse
Affiliation(s)
- Shahzad Abu Bakar
- Department of Chemistry
- Federal University of São Carlos
- São Carlos
- Brazil
- Embrapa CNPDIA
| | | |
Collapse
|
10
|
Xu N, Ding D. Preparation and antibacterial activity of chitosan derivative membrane complexation with iodine. RSC Adv 2015. [DOI: 10.1039/c5ra13227d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A chitosan based material with a polyvinylpyrrolidone membrane was prepared and used to adsorb iodine. The resultant material exhibited the sustained-release of iodine, and significant antibacterial activity against E. coli and S. aureus.
Collapse
Affiliation(s)
- Ningning Xu
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- People’s Republic of China
| | - Derun Ding
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- People’s Republic of China
| |
Collapse
|