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Lu H, Wang D, Huang D, Feng L, Zhang H, Zhu P. Product from sessile droplet evaporation of PNIPAM/water system above LCST: A block or micro/nano-particles? J Colloid Interface Sci 2023; 634:769-781. [PMID: 36565619 DOI: 10.1016/j.jcis.2022.12.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 12/16/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
PNIPAM as a stimuli-responsive polymer has generated extreme interests due to its versatile applications. However, there is no research report on whether PNIPAM micro/nano-particles can be extracted from its suspension after phase separation. In the present work, LCST-type phase separation in self-synthesized PNIPAM/water system was investigated in depth by dividing the DLS testing process into four stages. In addition to quenching duration, temperature rise process, quenching temperature and PNIPAM concentration all have a great influence on particle size of the suspension. Meanwhile, the steady-state rheology and dynamic viscoelasticity results show that PNIPAM micro/nano-particles in the suspension are "soft" that can deform. Finally, FE-SEM was used to observe the morphology of dehydrated PNIPAM extracted by sessile droplet evaporation under different conditions. The results indicate that these "soft" particles are easier to fuse together, do not have sufficient mechanical strength to maintain their spherical morphology after dehydration. But the above fusion can be suppressed by adjusting evaporation conditions to acquire smaller PNIPAM particles which have sufficient mechanical properties to keep their basic particle morphology. Further, by changing evaporation pressure to positive or negative pressure, dehydrated PNIPAM micro/nano-particles with excellent uniformity and separation can be obtained. This work will provide guidance for extracting micro/nano-particles from polymer/diluent systems with LCST.
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Affiliation(s)
- Hongwei Lu
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Danling Wang
- Zhongce Rubber Group Co., Ltd, Hangzhou, Zhejiang 310018, China
| | - Daye Huang
- Zhongce Rubber Group Co., Ltd, Hangzhou, Zhejiang 310018, China
| | - Luyao Feng
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Huapeng Zhang
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
| | - Peng Zhu
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China.
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Ma W, Zhou Z, Ismail N, Tocci E, Figoli A, Khayet M, Matsuura T, Cui Z, Tavajohi N. Membrane formation by thermally induced phase separation: Materials, involved parameters, modeling, current efforts and future directions. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.121303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Zhong L, Tao H, Gong X. Superhydrophobic Poly(l-lactic acid) Membranes with Fish-Scale Hierarchical Microstructures and Their Potential Application in Oil-Water Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6765-6775. [PMID: 34029095 DOI: 10.1021/acs.langmuir.1c00858] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this work, superhydrophobic poly(l-lactic acid) (PLLA) hierarchical membranes exhibiting excellent oil-removal performance, which is of great importance in curbing the oil-pollution environment, were fabricated by a simple solvent-evaporation-induced precipitation method. PLLA membranes with hierarchical micro/nanostructures (fish scales, fibrous sheets, and petal-like morphology) can be conveniently prepared by adjusting the preparation parameters including PLLA concentration, precipitation temperature, type of solvent and nonsolvent, and the addition of nano-SiO2. The results show that the water contact angle of the fish-scale-structured PLLA membrane was 138.6°, revealing that water repellency was significantly improved compared to that of the solvent-casting PLLA membrane (∼72.8°). Moreover, the PLLA/SiO2 nanocomposite membrane with a dense hierarchical micro/nanostructure had a water contact angle greater than 167.1°, which has great potential in oil-water separation.
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Affiliation(s)
- Lingqi Zhong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China
| | - Haizheng Tao
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China
| | - Xiao Gong
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, P. R. China
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Wang N, Tiberius V, Chen X, Brem A, Yu F. Idea selection and adoption by users – a process model in an online innovation community. TECHNOLOGY ANALYSIS & STRATEGIC MANAGEMENT 2020. [DOI: 10.1080/09537325.2020.1863055] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Nan Wang
- School of Business, Beijing Technology and Business University, Beijing, People’s Republic of China
| | - Victor Tiberius
- Faculty of Economics and Social Sciences, University of Potsdam, Potsdam, Germany
| | - Xiangxiang Chen
- School of Economic and Management, Beijing University of Posts and Telecommunications, Beijing, People’s Republic of China
| | - Alexander Brem
- Institute of Entrepreneurship and Innovation Science, University of Stuttgart, Stuttgart, Germany
- Department of Technology and Innovation, University of Southern Denmark, Sønderborg, Denmark
| | - Fei Yu
- Department of Technology and Innovation, University of Southern Denmark, Sønderborg, Denmark
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Farid T, Herrera VN, Kristiina O. Investigation of crystalline structure of plasticized poly (lactic acid)/Banana nanofibers composites. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1757-899x/369/1/012031] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gay S, Lefebvre G, Bonnin M, Nottelet B, Boury F, Gibaud A, Calvignac B. PLA scaffolds production from Thermally Induced Phase Separation: Effect of process parameters and development of an environmentally improved route assisted by supercritical carbon dioxide. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.02.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Fabrication of porous chitosan membranes composed of nanofibers by low temperature thermally induced phase separation, and their adsorption behavior for Cu2+. Carbohydr Polym 2017; 178:338-346. [DOI: 10.1016/j.carbpol.2017.09.051] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/09/2017] [Accepted: 09/13/2017] [Indexed: 11/24/2022]
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Li J, Wu X, Wu Y, Tang Z, Sun X, Pan M, Chen Y, Li J, Xiao R, Wang Z, Liu H. Porous chitosan microspheres for application as quick in vitro and in vivo hemostat. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 77:411-419. [PMID: 28532047 DOI: 10.1016/j.msec.2017.03.276] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 11/27/2016] [Accepted: 03/28/2017] [Indexed: 12/21/2022]
Abstract
Controlling massive hemorrhage is of great importance to lower transfusional medical cost, and to reduce death and mobility rate in battlefield and civilian accidents. We reported the fabrication of porous chitosan microspheres (CSMS) with tunable surface pore size by microemulsion combined with thermally induced phase separation technique, and its application as a quick hemostat. Their hemostatic property was characterized by blood clotting kinetics, adherence interaction between red blood cells/platelets and CSMS, in vitro and in vivo hemostasis by rat tail amputation and liver laceration models, and histological analysis. Their density, surface area, porosity, water absorption ratio were 0.04-0.06g/cm3, 28.2-31.5m2/g, 98%, and 15.5-23.2g/g, respectively. The surface pore was controlled to be smaller than 2.0μm. The porous CSMS showed increasing hemostatic efficacy with decreasing surface pore size. Compared to the conventional compact chitosan particles (CCSP), the porous CSMS had much improved in vitro and in vivo hemostatic potential with respect to formation of blood clot, hemostatic time, and blood loss. For instance, the hemostatic time and blood loss of CSMS in the rat liver laceration model were down to respectively 70s and 0.026g from 175s and 0.28g of CCSP. Histological examination showed that application of porous CSMS to liver laceration caused no destruction of underlying hepatocytes, inflammatory reaction, and thermal injury to liver tissue. The porous CSMS is a biodegradable, quick and safe hemostat, which can be used in various wounds including complex and non-compressive ones.
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Affiliation(s)
- Jixiang Li
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Xiaowei Wu
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Yanqing Wu
- College of Life Science, Fujian Normal University, Fujian 350007, China
| | - Zonghao Tang
- College of Life Science, Fujian Normal University, Fujian 350007, China
| | - Xun Sun
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Meng Pan
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Yufeng Chen
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Juanjuan Li
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China
| | - Rongdong Xiao
- Department of Cardiovascular Surgery, Provincial Clinical College, Fujian Medical University, Fujian 350001, China
| | - Zhengchao Wang
- College of Life Science, Fujian Normal University, Fujian 350007, China.
| | - Haiqing Liu
- Fujian Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fujian 350007, China.
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Torino E, Aruta R, Sibillano T, Giannini C, Netti PA. Synthesis of semicrystalline nanocapsular structures obtained by Thermally Induced Phase Separation in nanoconfinement. Sci Rep 2016; 6:32727. [PMID: 27604818 PMCID: PMC5015022 DOI: 10.1038/srep32727] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/08/2016] [Indexed: 12/18/2022] Open
Abstract
Phase separation of a polymer solution exhibits a peculiar behavior when induced in a nanoconfinement. The energetic constraints introduce additional interactions between the polymer segments that reduce the number of available configurations. In our work, this effect is exploited in a one-step strategy called nanoconfined-Thermally Induced Phase Separation (nc-TIPS) to promote the crystallization of polymer chains into nanocapsular structures of controlled size and shell thickness. This is accomplished by performing a quench step of a low-concentrated PLLA-dioxane-water solution included in emulsions of mean droplet size <500 nm acting as nanodomains. The control of nanoconfinement conditions enables not only the production of nanocapsules with a minimum mean particle diameter of 70 nm but also the tunability of shell thickness and its crystallinity degree. The specific properties of the developed nanocapsular architectures have important implications on release mechanism and loading capability of hydrophilic and lipophilic payload compounds.
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Affiliation(s)
- Enza Torino
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Interdisciplinary Research Center of Biomaterials, CRIB P.le Tecchio 80, 80125, Naples, Italy
| | - Rosaria Aruta
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Department of Chemical, Materials and Industrial Production Engineering, P.le Tecchio 80, 80125, Naples, Italy
| | - Teresa Sibillano
- CNR - IC Istituto di Cristallografia, via Amendola 122/O, 70126 Bari-Italia
| | - Cinzia Giannini
- CNR - IC Istituto di Cristallografia, via Amendola 122/O, 70126 Bari-Italia
| | - Paolo A. Netti
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Interdisciplinary Research Center of Biomaterials, CRIB P.le Tecchio 80, 80125, Naples, Italy
- University of Naples Federico II, Department of Chemical, Materials and Industrial Production Engineering, P.le Tecchio 80, 80125, Naples, Italy
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