JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yuze Zhou,Jiaying Lei,Jing Peng,Tengling Ye,Yumeng Wang,Ruipeng Huang,Yubo Zhang,Yonghui Ren,Yuhong Zhou,Dongyan Tang
Stimuli-responsive poly( N -vinylcaprolactam) (PVCL)-based microgels, which could response to small external environmental changes, have attracted great interests in the fields of biomedicine and nanotechnology. However, the preparation of such microgels meets severe challenge due to their low incorporation efficiency and thermoresponsivity passivation. To address these issues, we select 3-( tert- butoxycarbonyl)- N- vinylcaprolactam (TBVCL), a carboxyl-functionalized VCL derivative, as a comonomer to develop pH/temperature dual-responsive microgels. TBVCL, with a structure similar to VCL, enhances incorporation efficiency and colloidal stability, while reducing thermoresponsivity passivation. The volume phase transition temperature (VPTT) of the microgels can be adjusted over a broad range (19.0–49.5 °C). Notably, the radial swelling ratios of the microgels can be modulated by pH, achieving a maximum swelling ratio of 3. The distinct changes in dissolution-precipitation behavior under different temperatures or pH conditions make these microgels suitable for applications such as smart windows and sensors. Furthermore, this novel approach for fabricating microgels with pH-tunable phase-transition temperatures demonstrates significant potential for the controlled release of nanoparticles (e.g., drugs, catalysts, and quantum dots) and the development of smart nanocrystal-polymer composite sensors.
研究领域:
材料科学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Huanfeng He,Sai Liu,Yuwei Du,Rui Zhang,Tsz Chung Ho,Chi Yan Tso
Recently, there is rapid development of thermochromic metal halide perovskite (MHPs) for smart window applications due to their competitive optical performance and cost-effective synthesis. However, existing MHP smart windows predominantly feature 3D perovskite, which exhibits a deficiency in environmental stability, presenting persistent challenges for practical applications. This study introduces a novel and more durable 2D thermochromic perovskite, Tha 2 MAPbI 4 (TMPI, Tha = thiourea, MA = methylamine), wherein Tha acts as a Lewis acid-base adduct. TMPI demonstrates a reversible transition, achieving 83.7% luminous transmittance in the cold state and 35.2% in the hot state, thereby showcasing a substantial solar modulation ability of 24.7%. Further analysis of the crystal structure reveals that the thermochromic behavior of TMPI arises from a phase transition between 0D perovskite and 2D perovskite, induced by a dehydration-hydration process. Notably, TMPI maintains thermochromic properties even after direct exposure to 75% relative humidity and 25 °C air for up to 28 days, a stark contrast to traditional 3D perovskites that lose their thermochromic capabilities within a few days under similar conditions. This research unveils TMPI as a thermochromic 2D perovskite that marks a significant advancement in environmental stability, indicating promising prospects for thermochromic smart windows.
研究领域:
材料科学
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建筑技术
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光学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Zhe Qu,Lin Yao,Jing Li,Junhui He,Jie Mi,Shihui Ma,Siyao Tang,Lili Feng
Thermochromic vanadium dioxide (VO2) as one of the most promising candidates for smart windows has attracted widespread attention in recent years. Excellent optical performances (luminous transmittance, Tlum, and solar modulation efficiency, ΔTsol) of VO2-based coatings are usually pursued as crucial issues. In the current work, we report an ingenious approach for the synthesis of VO2@SiO2 dual-shell hollow nanospheres (DSHNs) and the preparation of DSHNs thermochromic coatings. A sequential bifunctional template-induced mechanism for the formation of DSHNs was proposed. Because of the unique hollow-core and dual-shell structure, the as-prepared VO2@SiO2 DSHNs coatings exhibited appealing optical performances with enhanced luminous transmittance of 61.8% and solar modulation efficiency of 12.6%, compared with continuous and dense VO2 coatings. It has been proved that the improvement of visible transmittance could be ascribed to the effective reduction of refractive index (from 2.6 to 1.6 at 630 nm). In addition, its excellent thermochromic performance has been confirmed by the model cubes measurements, expressing a great potential as energy-efficient smart windows in high-rise buildings. The bifunctional template-induced synthetic strategy may inspire more facile, efficient and inexpensive processes for development of well-defined multishelled hollow nanostructures for varied applications.
研究领域:
材料科学
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纳米技术
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DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Haiquan Zhang,Ling Wang,Fuge Wang,Qiaoming Fang,Songjiao Chen,Wei He,Ning Wang
Chromogenic smart windows are one of the key components in improving the building energy efficiency. By simulation of the three-dimensional network of polymer hydrogels, thermal-responsive phase change materials (TRPCMs) are manufactured for energy-saving windows. For simulated polymer hydrogels, tetradecanol (TD) and a color changing dye (CCD) are filled in situ in poly(n-butyl isobutyrate) (PBB) networks. TRPCMs convert solar energy into thermal energy through a dark blue CCD. The TD phase change material (PCM) absorbs heat energy to become a transparent liquid. Simultaneously, the CCD changes from blue to colorless and transparent at around 45 °C. As a result, as-prepared TRPCMs transform from an opaque state at room temperature to a high-transparency state after melting (74.5%). TRPCMs also show a good thermal storage capacity, with a phase transition enthalpy exceeding 161.9 J g–1. As-prepared smart materials can simultaneously achieve photothermal conversion, thermal energy diffusion, latent heat storage, and resistance to liquid leakage at the phase interface between opaque and transparent states, providing more options for the design of energy-saving buildings.
研究领域:
材料科学
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能源工程
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建筑设计
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产品关联
DOI
PubMed
高影响因子
ENERGY AND BUILDINGS
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2025
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IF 7.1
Ranran Wu,Ziyu Wang,Junfang Chang,Sui Wang,Jie Mao
The development of thermochromic hydrogels for smart windows faces challenges in balancing optical performance, durability, and environmental adaptability. Traditional chemically crosslinked hydrogels suffer from low transmittance and structural instability during phase transitions. Herein, we propose a physical chain-entangled thermochromic hydrogel (PNA) via a one-pot synthesis of polyvinyl alcohol (PVA), poly(N-isopropylacrylamide) (PNIPAM), and polyacrylic acid (PAA). PVA provides a network framework for the temperature-sensitive phase transition of PNIPAM, enabling a rapid (5 s) switch of the hydrogel from a highly transparent state ( T lum ≈ 95 %) to an opaque state ( T lum < 20 %). By modulating PAA content, the lower critical solution temperature (LCST) is precisely tuned to 25 °C, aligning with human thermal comfort. Unlike traditional chemically cross-linked hydrogels, this physical chain-entangled hydrogel has a uniform pore structure, ensuring that the light transmittance of the hydrogel is independent of its thickness. This PNA smart window has demonstrated outstanding stability in long-term cycle tests (heating–cooling/ultraviolet aging), with a reduction in light transmittance of less than 5 %. DSC analysis and transmittance analysis show that this smart window has good frost resistance under sub-zero climate conditions (−20 °C freezing point). In the practical application simulation of PNA smart windows, it has reduced the box temperature by 10 °C compared with ordinary glass, demonstrating outstanding application potential in the field of energy-saving building materials.
研究领域:
材料科学
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能源技术
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 33
·15714-15726
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IF 3.5
Wu Jing,Li Jia,Huang Jinhua,Song Weijie,Tan Ruiqin
Heat management and color appearance are the key issues for the application of smart windows. Herein, a vibrant colored energy-saving polymer-dispersed liquid crystal (PDLC) film has been designed by combining dye-doping and the application of a heat shielding electrode. The LC droplet size could be varied by tuning the content of the dye. PDLC films featuring a low Disperse Orange 25 Azo dye concentration (0.06%) achieving an impressive contrast ratio of up to 101.5 with the transmittance reaching 79.17% at on state. Furthermore, indium tin oxide (ITO) and aluminum-doped zinc oxide (AZO) were chosen as the conductive layer materials, and the heat shielding properties of ITO and AZO/Ag/ITO (AAI) films were applied to PDLC devices and comparatively investigated. The AAI-based devices exhibited temperature reductions of 2 °C and 4 °C compared to the ITO-based devices at off and on states, respectively. This highlights the remarkable heat shielding performance and energy-saving capability of AAI-PDLC devices, as well as good flexibility and cycle stability. These AAI-based colored PDLC films exhibit substantial potential for smart window applications especially in buildings and automotive industry. Graphical Abstract
研究领域:
材料科学
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能源技术
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光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Chang Xiao,Chengcheng Wang,Liping Zhang,Shaohai Fu
Electro- and thermochromic materials have been greatly applied in smart windows and displays due to the excellent properties of color variation and solar radiation. However, the mono color and single response to voltage and temperature hinder their application and development. Here, a multimode dynamic color-changing device (T/ECD) was developed by integrating the electrochromic property of synthetic viologen dyes and the thermochromic properties of hydroxypropyl acrylate (HPA). The T/ECD achieves four modes of optical regulation, namely, colorless transparent state, tinted transparent state, colorless opaque state, and tinted opaque state, which can be regulated independently/coordinately using heat and voltage. The optimized T/ECD switched color at 1.2 V with 15 s or adjusted the transparent/opaque state at >34 °C with 46 s. In addition, based on the red viologen (ViO-R), green viologen (ViO-G), and blue viologen (ViO-B) dyes, colorful T/ECDs were successfully designed and fabricated, and T/ECDs have excellent cycling properties, expanding the application requirement. Moreover, we demonstrated their application in smart windows and privacy protection. The design philosophy and successful exploration have great prospects for energy-saving buildings, displays, and information masking/storage systems.
研究领域:
材料科学
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能源技术
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建筑设计
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 20
·2214382
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IF 19
Shan Chen,Geyuan Jiang,Jianhong Zhou,Gang Wang,Ying Zhu,Wanke Cheng,Guangwen Xu,Dawei Zhao,Haipeng Yu
Smart materials that can dynamically modulate incident light provide a broad prospect for the development of smart windows. However, the absence of capability to create smart materials with rapid transmittance switchability and mechanical robustness has restricted the realization of self-defensive smart windows. Here, a solvatochromic alcogel designed by cellulose–polyacrylamide supramolecular configuration for developing a self-defensive smart window is reported. The alcogel with compact nano-bulge structures exhibits reversible and rapid switching of transparency between 85% and 5%, cycle time less than 8 s, and has strong mechanical robustness with elastic modulus of over 60 MPa. With this smart alcogel, the proposed self-defensive smart window not only shows real-time and reliable adjustment of transparency but also outputs a strong mechanical impact resistance of up to 42.8 kJ m −2 , 10 and 12 times higher than that of a normal glass and photochromic window, respectively. It is believed that this study will open new opportunities for both fabrication and application of biological gels in smart windows and intelligent devices.
研究领域:
材料科学
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智能器件
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生物材料
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产品关联
DOI
高影响因子
SOLAR ENERGY
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2024
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IF 6
Xiangfei Kong,Yue Han,Xuemei Zhang,Xuan Zhao,Jianjuan Yuan
Thermochromic smart windows based on hydrogels with adaptive regulation of solar radiation have attracted an increasing attention due to their potential in temperature management. However, hydrogels with extremely high water content may freeze, leading to the risk of transparency reduction and even window breakage in cold environment. In this study, co-crosslinked P(NIPAM-co-AM)@GLY@PVA hydrogel with excellent solar radiation regulation and anti-freezing performance was prepared by introducing antifreeze glycerol (GLY) and polymer polyvinyl alcohol (PVA). By adjusting the amount of GLY, PVA and hydrophilic AM, P(NIPAM-co-AM)@GLY@PVA hydrogel showed a satisfactory thermochromic performance, with a luminous transmittance ( T lum ) of 68.05 %, a solar modulation ability (Δ T sol ) of 62.11 %, a lower critical solution temperature (LCST) of ∼24 °C and an antifreeze temperature of −15 °C. The thermal management experiments proved that the thermochromic@anti-freezing (TCA) smart window assembled based on P(NIPAM-co-AM)@GLY@PVA hydrogel had an excellent performance in managing indoor temperature and cyclic stability. This work may open a new avenue to solve problems in the application field of hydrogel-based smart windows.
研究领域:
材料科学
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能源工程
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建筑技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Bin Li,Shouqin Tian,Jiachen Qian,Senwei Wu,Baoshun Liu,Xiujian Zhao
Thermochromic VO 2 -based smart windows are considered as a highly promising building envelope to reduce building energy consumption. However, the inherent unsatisfactory optical performance hindered its practical applications and nanocomposite films are testified to be the most promising strategy addressing this issue, while uniformly dispersing nanoparticles is often a challenge. Herein, a facile in situ method was proposed to directly fabricate highly dispersed VO 2 nanoparticles (HD-VN) on a glass surface from the VOC 2 O 4 ·xH 2 O aqueous solution to achieve the high-optical performance VO 2 film (HD-VN film). The forming mechanism of HD-VN was fully elucidated and HD-VN was generated via the sintering process from the irregular VO 2 particles derived from the decomposition of polyvinyl pyrrolidone (PVP). The HD-VN film showed excellent luminous transmittance ( T lum ) of 72.5% and solar energy modulation efficiency (Δ T sol ) of 10.1%, the former was attributed to the reduced refractive index which led to a reduced reflectance of HD-VN film, and the latter was ascribed to the localized surface plasmon resonance (LSPR) behavior of the HD-VN. The simple and cost-efficient synthesis strategy would promote the application of VO 2 film in energy-efficient glazing, and also shed light on the structures’ design applied to the field of optics, catalysts, and sensors.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2023
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IF 2.2
Zemin He,Ping Yu,Hao Ma,Zhun Guo,Dongxia Zhang,Huimin Zhang,Yuzhen Zhao,Zongcheng Miao,Dong Wang
In this work, we report a bifunctional dynamically colour-changing polymer-dispersed liquid crystals (PDLCs) for smart windows by doping a supporting electrolyte ionic liquid into the conventional PDLC system. The transmittance spectra were used to measure the electrically colour-changing properties of the system, while the electro-optical curves were employed to examine the electrically switchable performances. The SEM was used to observe the surface morphology of the polymer microstructure. The result obtained from this work suggested that such device could obtain four independent states under different electric fields. The initial state was opaque and colourless due to the randomly dispersed liquid crystal droplets. The transparent and colourless state was obtained as a result of reorientation of liquid crystal under alternative current (AC) electric field. The opaque and green state was achieved under direct current (DC) electric field owing to the oxidation reaction in the system. Besides, the transparent and green state was realised via applying DC and AC electric field simultaneously or in steps. The convenience and simplification of switching between the four states enable the system to provide some interesting applications for smart windows.
研究领域:
材料科学
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光学工程
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化学工程
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产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 8
·2201688
·
IF 6.8
He Zhang,Jiayun Feng,Fangyuan Sun,Dongyan Zhou,Ge Cao,Shang Wang,Xuanyi Hu,Jingxuan Ma,Fengyu Su,Yanqing Tian,Yanhong Tian
Electrochromic devices (ECDs) with adjustable transmittance have opened new opportunities to the development of smart windows for energy-efficiency building. However, the switching between colored and bleached state of conventional ECD will bring extra energy consumption, the design of high-performance ECD with low consumption is still an elusive goal. To address this issue, a self-driven and energy-saving Ni anode-based ECD using Prussian blue as electrochromic material is developed. During the day, it can be colored by solar energy. By contrast, it can spontaneously bleach when the ECD's anode and cathode are short-circuiting using the internal redox potential during the night. It is worth noting that no extra energy is inputted in the coloring-bleaching cycle. In comparison with the ECD using electrolyte with high Ni 2+ (K + :Ni 2+ = 1:9) or high K + (K + :Ni 2+ = 9:1) concentration with poor optical contrast and cyclic stability (failed <100 cycles), the Ni-based ECD with the electrolyte containing equal amount of K + and Ni 2+ exhibits a high optical contrast (39.45%), good coloration response time (6 s), and excellent stability (1000 cycles). These properties suggest that the Ni-based electrochromic configuration is expected to be a catalyst for the development of energy-storage EC smart window in the future.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）