Hanjun Ryu
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View article: Direct current generation in triboelectric nanogenerators through ionic dynamics and electrode polarization effects
Direct current generation in triboelectric nanogenerators through ionic dynamics and electrode polarization effects Open
Efficient conversion of mechanical energy into direct current remains a significant challenge for current energy-harvesting devices. In ionic tribomaterials, the displacement and polarization of mobile ions can dynamically control both the…
View article: Recent Advances in Bioresorbable Biomedical Applications: From Materials to Devices
Recent Advances in Bioresorbable Biomedical Applications: From Materials to Devices Open
Wearable and implantable devices provide users with continuous monitoring and treatment, and bioresorbable features can facilitate the use of temporary biomedical devicesand reduce electronic wastes (e‐wastes). Bioresorbable metals and pol…
View article: Recent advances in nanogenerators for wearable electronic devices
Recent advances in nanogenerators for wearable electronic devices Open
The advancement of triboelectric nanogenerators (TENGs) and piezoelectric nanogenerators (PENGs) have impacted different fields of emerging technological applications by changing wasted mechanical energy into useful electrical energy. Spec…
View article: Bioresorbable Materials for Wound Management
Bioresorbable Materials for Wound Management Open
Chronic wounds pose a significant healthcare challenge due to their risk of severe complications, necessitating effective management strategies. Bioresorbable materials have emerged as an innovative solution, offering advantages such as el…
View article: Direct Current Generation in Triboelectric Nanogenerators Through Ionic Dynamics and Electrode Polarization Effects
Direct Current Generation in Triboelectric Nanogenerators Through Ionic Dynamics and Electrode Polarization Effects Open
Efficient conversion of mechanical energy into DC remains a challenge with existing methods, including Triboelectric Nanogenerators (TENGs). In ionic tribomaterials, ion displacement and polarization enable dynamic control over charge magn…
View article: Manufacturing strategies for highly sensitive and self-powered piezoelectric and triboelectric tactile sensors
Manufacturing strategies for highly sensitive and self-powered piezoelectric and triboelectric tactile sensors Open
Piezoelectric and triboelectric effects are of growing interest for facilitating high-sensitivity and self-powered tactile sensor applications. The working principles of piezoelectric and triboelectric nanogenerators provide strategies for…
View article: A wireless, implantable bioelectronic system for monitoring urinary bladder function following surgical recovery
A wireless, implantable bioelectronic system for monitoring urinary bladder function following surgical recovery Open
Partial cystectomy procedures for urinary bladder–related dysfunction involve long recovery periods, during which urodynamic studies (UDS) intermittently assess lower urinary tract function. However, UDS are not patient-friendly, they exhi…
View article: Self‐Boosting Energy Generation via Triboelectric Nanogenerator–Capacitor Coupling
Self‐Boosting Energy Generation via Triboelectric Nanogenerator–Capacitor Coupling Open
With the development of wearable and wireless electronic devices, the triboelectric nanogenerator (TENG) is attracting interest as a candidate for portable power. Many studies are conducted to increase the surface charge density of the TEN…
View article: Visible Pancreatic Tail Pseudocyst on Abdominal Transplenic Scan
Visible Pancreatic Tail Pseudocyst on Abdominal Transplenic Scan Open
Chronic pancreatitis is the end result of a continuous, prolonged, inflammatory, and fibrosing process that affects the pancreas. Pseudocyst is a common sequela of acute pancreatitis or chronic pancreatitis. It is difficult to detect pancr…
View article: Materials and Device Designs for Wireless Monitoring of Temperature and Thermal Transport Properties of Wound Beds during Healing
Materials and Device Designs for Wireless Monitoring of Temperature and Thermal Transport Properties of Wound Beds during Healing Open
Chronic wounds represent a major health risk for diabetic patients. Regeneration of such wounds requires regular medical treatments over periods that can extend for several months or more. Schemes for monitoring the healing process can pro…
View article: Piezoelectric and Triboelectric Nanogenerators for Enhanced Wound Healing
Piezoelectric and Triboelectric Nanogenerators for Enhanced Wound Healing Open
Wound healing is a highly orchestrated biological process characterized by sequential phases involving inflammation, proliferation, and tissue remodeling, and the role of endogenous electrical signals in regulating these phases has been hi…
View article: Materials and Design Approaches for a Fully Bioresorbable, Electrically Conductive and Mechanically Compliant Cardiac Patch Technology (Adv. Sci. 27/2023)
Materials and Design Approaches for a Fully Bioresorbable, Electrically Conductive and Mechanically Compliant Cardiac Patch Technology (Adv. Sci. 27/2023) Open
Bioresorbable Cardiac Patch Bioresorbable materials have great potential in implantable and temporal biomedical devices. In article number 2303429, Guillermo Antonio Ameer, John A. Rogers, and co‐workers demonstrate a highly conductive and…
View article: Materials and Design Approaches for a Fully Bioresorbable, Electrically Conductive and Mechanically Compliant Cardiac Patch Technology
Materials and Design Approaches for a Fully Bioresorbable, Electrically Conductive and Mechanically Compliant Cardiac Patch Technology Open
Myocardial infarction (MI) is one of the leading causes of death and disability. Recently developed cardiac patches provide mechanical support and additional conductive paths to promote electrical signal propagation in the MI area to synch…
View article: A Miniaturized, Battery‐Free, Wireless Wound Monitor That Predicts Wound Closure Rate Early
A Miniaturized, Battery‐Free, Wireless Wound Monitor That Predicts Wound Closure Rate Early Open
Diabetic foot ulcers are chronic wounds that affect millions and increase the risk of amputation and mortality, highlighting the critical need for their early detection. Recent demonstrations of wearable sensors enable real‐time wound asse…
View article: An on-demand bioresorbable neurostimulator
An on-demand bioresorbable neurostimulator Open
Bioresorbable electroceuticals, as a therapeutic approach for peripheral neuropathy, hold substantial potential, given their capability of spontaneous degradation and elimination, thereby obviating the necessity for surgical removal. Recen…
View article: Suspected Case of Secondary Splenic Tuberculosis Difficult to Differentiate from Pyogenic Splenic Abscess
Suspected Case of Secondary Splenic Tuberculosis Difficult to Differentiate from Pyogenic Splenic Abscess Open
Splenic tuberculosis is known to occur due to hematogenous spread from the affected lungs. Ultrasonography shows non-specific features, including hepatosplenomegaly or abscess. Possible small hypoechoic nodules or larger hypoechoic mass-li…
View article: Bioresorbable, wireless, and battery-free system for electrotherapy and impedance sensing at wound sites
Bioresorbable, wireless, and battery-free system for electrotherapy and impedance sensing at wound sites Open
Chronic wounds, particularly those associated with diabetes mellitus, represent a growing threat to public health, with additional notable economic impacts. Inflammation associated with these wounds leads to abnormalities in endogenous ele…
View article: An on-demand bioresorbable neurostimulator
An on-demand bioresorbable neurostimulator Open
The original source data for all results presented in the paper.
View article: An on-demand bioresorbable neurostimulator
An on-demand bioresorbable neurostimulator Open
Data collection: Electrical characterization data were collected using Tektronix oscilloscope (Tektronix, DPO3052) data saving software. Micro-CT images were taken using Skyscan 1276 (Bruker). Data analysis: Electrical characterization dat…
View article: Biodegradable, three-dimensional colorimetric fliers for environmental monitoring
Biodegradable, three-dimensional colorimetric fliers for environmental monitoring Open
Recently reported winged microelectronic systems offer passive flight mechanisms as a dispersal strategy for purposes in environmental monitoring, population surveillance, pathogen tracking, and other applications. Initial studies indicate…
View article: Visible Chronic Pancreatitis and Pseudocyst after Drinking Water and Changing Position
Visible Chronic Pancreatitis and Pseudocyst after Drinking Water and Changing Position Open
Chronic pancreatitis represents the result of a continuous, prolonged, inflammatory, and fibrosing process that affects the pancreas. Pseudocysts are common sequelae of acute pancreatitis or chronic pancreatitis and the most common cystic …
View article: A bioresorbable peripheral nerve stimulator for electronic pain block
A bioresorbable peripheral nerve stimulator for electronic pain block Open
Local electrical stimulation of peripheral nerves can block the propagation of action potentials, as an attractive alternative to pharmacological agents for the treatment of acute pain. Traditional hardware for such purposes, however, invo…
View article: A Skin‐Interfaced, Miniaturized Microfluidic Analysis and Delivery System for Colorimetric Measurements of Nutrients in Sweat and Supply of Vitamins Through the Skin
A Skin‐Interfaced, Miniaturized Microfluidic Analysis and Delivery System for Colorimetric Measurements of Nutrients in Sweat and Supply of Vitamins Through the Skin Open
Nutrients play critical roles in maintaining core physiological functions and in preventing diseases. Technologies for delivering these nutrients and for monitoring their concentrations can help to ensure proper nutritional balance. Eccrin…
View article: Battery-free, wireless soft sensors for continuous multi-site measurements of pressure and temperature from patients at risk for pressure injuries
Battery-free, wireless soft sensors for continuous multi-site measurements of pressure and temperature from patients at risk for pressure injuries Open
Capabilities for continuous monitoring of pressures and temperatures at critical skin interfaces can help to guide care strategies that minimize the potential for pressure injuries in hospitalized patients or in individuals confined to the…