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Pan X, Lin X, Zhang H, Liang L, Pang C, Gu K, Hu Y, Xi H. Rheological and radioactive decontamination properties of ethyl cellulose sols in green solvents at a temperature below 0 °C. RSC Adv 2024; 14:3659-3666. [PMID: 38268552 PMCID: PMC10805129 DOI: 10.1039/d3ra06641j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 01/09/2024] [Indexed: 01/26/2024] Open
Abstract
Strippable film decontamination has been considered one of the best prospects for radioactive surface decontamination due to its high decontamination effect and less secondary pollution. However, research into strippable films has until now focused on radioactive decontamination at room temperature. Therefore, it is vital to seek a suitable degradable material for preparing strippable films in removing contaminants in an extremely cold region, as it will face the problem of the freezing of the detergent. Ethyl cellulose (EC) is a kind of degradable biopolymer which is easily dissolved in volatile green organic solvents to form a sol below 0 °C which is advantageous for forming a film. Therefore, it would be the best choice for preparing a strippable film detergent. In this study, EC sols were obtained by placing EC powder into the green solvents anhydrous ethanol and ethyl acetate. The steady and dynamic rheological behavior of EC sols was investigated with a rotary rheometer with the temperature ranging from -10 °C to 0 °C to disclose their spraying performance. Moreover, the radioactive decontamination effect of EC sols and the mechanism were also investigated. The results showed that the EC sols were pseudoplastic fluids which obeyed the Ostwald-de Waele power law below 0 °C. Furthermore, the viscosity of EC sols could be reduced by stirring, which is convenient for large-area spraying during decontamination below 0 °C. At -10 °C, the comprehensive decontamination rates of all plates were over 85%. Therefore, EC sols could be used as a basic material for strippable film decontamination below 0 °C.
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Affiliation(s)
- Xunhai Pan
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
- School of Bioengineering, Sichuan University of Science and Engineering 644005 Yibin Sichuan China
| | - Xiaoyan Lin
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
- Engineering Research Center of Biomass Materials, Ministry of Education, Southwest University of Science and Technology 621010 Mianyang Sichuan China
| | - Hao Zhang
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
| | - Lili Liang
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
| | - Chunxia Pang
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
- School of Bioengineering, Sichuan University of Science and Engineering 644005 Yibin Sichuan China
| | - Kai Gu
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
| | - Yang Hu
- School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
| | - Hailing Xi
- State Key Laboratory of NBC Protection for Civilian 102205 Beijing China
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Xu X, Pan X, Li J, Li Z, Xie Y, Lin X. Radioactive decontamination in low-temperature environments by using a novel high-strength strippable coating. CHEMOSPHERE 2022; 308:136187. [PMID: 36041525 DOI: 10.1016/j.chemosphere.2022.136187] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 08/03/2022] [Accepted: 08/21/2022] [Indexed: 06/15/2023]
Abstract
Accidents involving nuclear leakage and radioactive source diffusion will result in a substantial amount of radioactive pollution, posing a threat to the world's environment as well as human safety. To get rid of the pollution, this work describes a new type of strippable detergent coating designed to remove radioactive contamination, especially in low-temperature conditions. In situ polymerization was employed to make EC/PUA/PVAc detergent from degradable ethyl cellulose (EC), tea polyphenols (TP), and polyvinyl acetate (PVAc), and polytetramethylene ether glycol bis-para-aminobenzoate (P1000). The film-forming performance, decontamination efficiency, and mechanical properties of the decontamination coating formed by the detergent were studied. Designed to work in a low-temperature environment, the detergent can be sprayed and peeled to remove surface radioactive staining. A universal material testing machine was used to assess the low-temperature rheometry, SEM, EDX, FT-IR, and other variables and to characterize the decontamination coating and the decontamination mechanism of the detergent. At -10-10 °C, the EC/PUA/PVAc detergent has good fluidity and sprayability and forms a strippable coating. The tensile strength of the decontamination coating can be as high as 26.4 MPa, and its 180° peel strength on ceramic tile, glass, stainless steel, cement, marble are 0.49 ± 0.08 N/m, 1.82 ± 0.41 N/m, 3.03 ± 1.65 N/m, 35.60 ± 1.17 N/m, 44.43 ± 4.10 N/m, respectively. The decontamination factors ranged from 3.32 to 10.02, with a decontamination rate above 85%.
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Affiliation(s)
- Xinrui Xu
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China; Engineering Research Center of Biomass Materials, Ministry of Education, Mianyang, 621010, China
| | - Xunhai Pan
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China; Engineering Research Center of Biomass Materials, Ministry of Education, Mianyang, 621010, China
| | - Jian Li
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
| | - Zhanguo Li
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
| | - Yu Xie
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China; Engineering Research Center of Biomass Materials, Ministry of Education, Mianyang, 621010, China
| | - Xiaoyan Lin
- School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China; Engineering Research Center of Biomass Materials, Ministry of Education, Mianyang, 621010, China.
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Cao J, Shen C, Wang X, Zhu Y, Bao S, Wu X, Fu Y. A porous cellulose-based molecular imprinted polymer for specific recognition and enrichment of resveratrol. Carbohydr Polym 2021; 251:117026. [DOI: 10.1016/j.carbpol.2020.117026] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 08/04/2020] [Accepted: 08/28/2020] [Indexed: 01/13/2023]
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Oral Modified Release Multiple-Unit Particulate Systems: Compressed Pellets, Microparticles and Nanoparticles. Pharmaceutics 2018; 10:pharmaceutics10040176. [PMID: 30287798 PMCID: PMC6321440 DOI: 10.3390/pharmaceutics10040176] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/07/2018] [Accepted: 09/16/2018] [Indexed: 01/06/2023] Open
Abstract
Oral modified-release multiparticulate dosage forms, which are also referred to as oral multiple-unit particulate systems, are becoming increasingly popular for oral drug delivery applications. The compaction of polymer-coated multiparticulates into tablets to produce a sustained-release dosage form is preferred over hard gelatin capsules. Moreover, multiparticulate tablets are a promising solution to chronic conditions, patients’ adherence, and swallowing difficulties if incorporated into orodispersible matrices. Nonetheless, the compaction of multiparticulates often damages the functional polymer coat, which results in a rapid release of the drug substance and the subsequent loss of sustained-release properties. This review brings to the forefront key formulation variables that are likely to influence the compaction of coated multiparticulates into sustained-release tablets. It focusses on the tabletting of coated drug-loaded pellets, microparticles, and nanoparticles with a designated section on each. Furthermore, it explores the various approaches that are used to evaluate the compaction behaviour of particulate systems.
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Encapsulation of Cinnamon Essential Oil for Active Food Packaging Film with Synergistic Antimicrobial Activity. NANOMATERIALS 2018; 8:nano8080598. [PMID: 30082645 PMCID: PMC6116257 DOI: 10.3390/nano8080598] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/02/2018] [Accepted: 08/03/2018] [Indexed: 11/16/2022]
Abstract
Porous adsorption, a less powerful adsorptive force than chemical bonds, is based on the physical adsorption of small molecules onto a solid surface that is capable of adsorbing gas or liquid molecules. Antimicrobial permutite composite (containing Ag+, Zn2+ and Ag+/Zn2+), starting from Linde Type A-permutite (LTA), was obtained in this research. The permutite samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), colorimeter and nitrogen adsorption technique. Cinnamon essential oil (CEO) was encapsulated into Ag+/Zn2+-permutite. The FT-IR and differential scanning calorimetry (DSC) confirmed that no chemical bond existed between CEO and Ag+/Zn2+-permutite. The loading capacity of Ag+/Zn2+-permutite/CEO was 313.07 µL/g, and it had a sustained release effect. The Ag+/Zn2+-permutite/CEO showed stronger efficacy against Aspergillus niger and Penicillium sp. than Ag+/Zn2+-permutite. Ethyl cellulose pads modified by composite antimicrobial particles were applied in the preservation of Chinese bayberry. Compared to the control group, treatment with the Ag+/Zn2+-permutite/CEO antimicrobial pads resulted in a significantly lower decay incidence. In addition, the amount of migrated silver, zinc and aluminum from LTA was below the legal limit. These results confirmed that the ethyl cellulose pads modified by the Ag+/Zn2+-permutite/CEO provided an active packaging to control decay of fresh Chinese bayberry.
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