{"title":"Jetting-based bioprinting: process, dispense physics, and applications","authors":"Wei Long Ng, Viktor Shkolnikov","doi":"10.1007/s42242-024-00285-3","DOIUrl":"https://doi.org/10.1007/s42242-024-00285-3","url":null,"abstract":"<p>Jetting-based bioprinting facilitates contactless drop-on-demand deposition of subnanoliter droplets at well-defined positions to control the spatial arrangement of cells, growth factors, drugs, and biomaterials in a highly automated layer-by-layer fabrication approach. Due to its immense versatility, jetting-based bioprinting has been used for various applications, including tissue engineering and regenerative medicine, wound healing, and drug development. A lack of in-depth understanding exists in the processes that occur during jetting-based bioprinting. This review paper will comprehensively discuss the physical considerations for bioinks and printing conditions used in jetting-based bioprinting. We first present an overview of different jetting-based bioprinting techniques such as inkjet bioprinting, laser-induced forward transfer bioprinting, electrohydrodynamic jet bioprinting, acoustic bioprinting and microvalve bioprinting. Next, we provide an in-depth discussion of various considerations for bioink formulation relating to cell deposition, print chamber design, droplet formation and droplet impact. Finally, we highlight recent accomplishments in jetting-based bioprinting. We present the advantages and challenges of each method, discuss considerations relating to cell viability and protein stability, and conclude by providing insights into future directions of jetting-based bioprinting.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>\u0000","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141610236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A crosstalk-free dual-mode sweat sensing system for naked-eye sweat loss quantification via changes in structural reflectance","authors":"Bowen Zhong, Hao Xu, Xiaokun Qin, Lingchen Liu, Hailong Wang, Lili Wang","doi":"10.1007/s42242-024-00294-2","DOIUrl":"https://doi.org/10.1007/s42242-024-00294-2","url":null,"abstract":"<p>Sweat loss monitoring is important for understanding the body’s thermoregulation and hydration status, as well as for comprehensive sweat analysis. Despite recent advances, developing a low-cost, scalable, and universal method for the fabrication of colorimetric microfluidics designed for sweat loss monitoring remains challenging. In this study, we propose a novel laser-engraved surface roughening strategy for various flexible substrates. This process permits the construction of microchannels that show distinct structural reflectance changes before and after sweat filling. By leveraging these unique optical properties, we have developed a fully laser-engraved microfluidic device for the quantification of naked-eye sweat loss. This sweat loss sensor is capable of a volume resolution of 0.5 μL and a total volume capacity of 11 μL, and can be customized to meet different performance requirements. Moreover, we report the development of a crosstalk-free dual-mode sweat microfluidic system that integrates an Ag/AgCl chloride sensor and a matching wireless measurement flexible printed circuit board. This integrated system enables the real-time monitoring of colorimetric sweat loss signals and potential ion concentration signals without crosstalk. Finally, we demonstrate the potential practical use of this microfluidic sweat loss sensor and its integrated system for sports medicine via on-body studies.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>\u0000","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141588053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xi Zhang, Junchi Ma, Hualin Deng, Jinming Zhong, Kaichen Xu, Qiang Wu, Bo Wen, Dongfeng Diao
{"title":"A mixed-coordination electron trapping-enabled high-precision touch-sensitive screen for wearable devices","authors":"Xi Zhang, Junchi Ma, Hualin Deng, Jinming Zhong, Kaichen Xu, Qiang Wu, Bo Wen, Dongfeng Diao","doi":"10.1007/s42242-024-00293-3","DOIUrl":"https://doi.org/10.1007/s42242-024-00293-3","url":null,"abstract":"<p>Touch-sensitive screens are crucial components of wearable devices. Materials such as reduced graphene oxide (rGO), carbon nanotubes (CNTs), and graphene offer promising solutions for flexible touch-sensitive screens. However, when stacked with flexible substrates to form multilayered capacitive touching sensors, these materials often suffer from substrate delamination in response to deformation; this is due to the materials having different Young’s modulus values. Delamination results in failure to offer accurate touch screen recognition. In this work, we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch sensing. This is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene nanosheets. Here, we used an electron cyclotron resonance system to directly fabricate graphene–metal nanofilms (GMNFs) using carbon and copper, which are firmly adhered to flexible substrates. After being subjected to 3000 bending actions, we observed almost no change in touch sensitivity. The screen interaction system, which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi, was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%. Taken together, these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141588052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gaofeng Wang, Lingxian Meng, Xinyi Ji, Xuying Liu, Jiajie Liang, Shuiren Liu
{"title":"Nacre-inspired MXene-based film for highly sensitive piezoresistive sensing over a broad sensing range","authors":"Gaofeng Wang, Lingxian Meng, Xinyi Ji, Xuying Liu, Jiajie Liang, Shuiren Liu","doi":"10.1007/s42242-024-00292-4","DOIUrl":"https://doi.org/10.1007/s42242-024-00292-4","url":null,"abstract":"<p>As the main component of wearable electronic equipment, flexible pressure sensors have attracted wide attention due to their excellent sensitivity and their promise with respect to applications in health monitoring, electronic skin, and human–computer interactions. However, it remains a significant challenge to achieve epidermal sensing over a wide sensing range, with short response/recovery time and featuring seamless conformability to the skin simultaneously. This is critical since the capture of minute electrophysiological signals is important for health care applications. In this paper, we report the preparation of a nacre-like MXene/sodium carboxymethyl cellulose (CMC) nanocomposite film with a “brick-and-mortar” interior structure using a vacuum-induced self-assembly strategy. The synergistic behavior of the MXene “brick” and flexible CMC “mortar” contributes to attenuating interlamellar self-stacking and creates numerous variable conductive pathways on the sensing film. This resulted in a high sensitivity over a broad pressure range (i.e., 0.03–22.37 kPa: 162.13 kPa<sup>−1</sup>; 22.37–135.71 kPa: 127.88 kPa<sup>−1</sup>; 135.71–286.49 kPa: 100.58 kPa<sup>−1</sup>). This sensor also has a low detection limit (0.85 Pa), short response/recovery time (8.58 ms/34.34 ms), and good stability (2000 cycles). Furthermore, we deployed pressure sensors to distinguish among tiny particles, various physiological signals of the human body, space arrays, robot motion monitoring, and other related applications to demonstrate their feasibility for a variety of health and motion monitoring use cases.</p><h3 data-test=\"abstract-sub-heading\">Graphic abstract</h3>\u0000","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junyu Xiao, Mengfei Xu, Longchun Wang, Bin Yang, Jingquan Liu
{"title":"Implantable probe with integrated reference electrode for in situ neural signal and calcium ion monitoring","authors":"Junyu Xiao, Mengfei Xu, Longchun Wang, Bin Yang, Jingquan Liu","doi":"10.1007/s42242-024-00283-5","DOIUrl":"https://doi.org/10.1007/s42242-024-00283-5","url":null,"abstract":"<p>监测神经元的电生理活动和血液中的钙离子可以帮助人们更好地了解与疾病相 关的神经系统回路。然而,当前原位钙离子监测工具很少,且大多集成度低、灵 敏度有限。本文提出一种集成原位Ag/AgCl 参比电极(ISA/ARE)的植入式探针, 该探针可以监测动作电位(AP)和Ca<sup>2+</sup>浓度。实验结果表明,Ca<sup>2+</sup>传感器的灵敏 度可达100.7 mV/decade,其在干扰物实验中呈现良好的选择性。本研究通过铂 黑修饰的12 个电生理电极记录到了神经元的AP,而当将CaCl<sub>2</sub> 溶液重复微注射 到大脑的CA1 区域时,Ca<sup>2+</sup>传感器则观察到神经元的可逆电位变化。上述结果 表明,该探针能够满足电生理信号和离子浓度同步监测的需求,加深人们对神经 回路的理解,促进脑科学的发展。</p>","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Flexible, high-density, laminated ECoG electrode array for high spatiotemporal resolution foci diagnostic localization of refractory epilepsy","authors":"Yafeng Liu, Zhouheng Wang, Yang Jiao, Ying Chen, Guangyuan Xu, Yinji Ma, Xue Feng","doi":"10.1007/s42242-024-00278-2","DOIUrl":"https://doi.org/10.1007/s42242-024-00278-2","url":null,"abstract":"<p>High spatiotemporal resolution brain electrical signals are critical for basic neuroscience research and high-precision focus diagnostic localization, as the spatial scale of some pathologic signals is at the submillimeter or micrometer level. This entails connecting hundreds or thousands of electrode wires on a limited surface. This study reported a class of flexible, ultrathin, high-density electrocorticogram (ECoG) electrode arrays. The challenge of a large number of wiring arrangements was overcome by a laminated structure design and processing technology improvement. The flexible, ultrathin, high-density ECoG electrode array was conformably attached to the cortex for reliable, high spatial resolution electrophysiologic recordings. The minimum spacing between electrodes was 15 μm, comparable to the diameter of a single neuron. Eight hundred electrodes were prepared with an electrode density of 4444 mm<sup>−2</sup>. In focal epilepsy surgery, the flexible, high-density, laminated ECoG electrode array with 36 electrodes was applied to collect epileptic spike waves in rabbits, improving the positioning accuracy of epilepsy lesions from the centimeter to the submillimeter level. The flexible, high-density, laminated ECoG electrode array has potential clinical applications in intractable epilepsy and other neurologic diseases requiring high-precision electroencephalogram acquisition.</p>","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Beeren, G. Dos Santos, P. J. Dijkstra, C. Mota, J. Bauer, H. Ferreira, Rui L. Reis, N. Neves, S. Camarero-Espinosa, M. B. Baker, L. Moroni
{"title":"A facile strategy for tuning the density of surface-grafted biomolecules for melt extrusion-based additive manufacturing applications","authors":"I. Beeren, G. Dos Santos, P. J. Dijkstra, C. Mota, J. Bauer, H. Ferreira, Rui L. Reis, N. Neves, S. Camarero-Espinosa, M. B. Baker, L. Moroni","doi":"10.1007/s42242-024-00286-2","DOIUrl":"https://doi.org/10.1007/s42242-024-00286-2","url":null,"abstract":"","PeriodicalId":48627,"journal":{"name":"Bio-Design and Manufacturing","volume":null,"pages":null},"PeriodicalIF":7.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}